utils.c   [plain text]

/* General utility routines for GDB, the GNU debugger.

   Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
   1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free
   Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "gdb_assert.h"
#include <ctype.h>
#include "gdb_string.h"
#include "event-top.h"
#include "exceptions.h"
#include "bfd.h"
#include <execinfo.h>
#include <sys/resource.h>
#include <uuid/uuid.h>

#ifdef TUI
#include "tui/tui.h"		/* For tui_get_command_dimension.   */
#endif

#ifdef __GO32__
#include <pc.h>
#endif

/* SunOS's curses.h has a '#define reg register' in it.  Thank you Sun. */
#ifdef reg
#undef reg
#endif

#include <signal.h>
#include "gdbcmd.h"
#include "serial.h"
#include "bfd.h"
#include "target.h"
#include "demangle.h"
#include "expression.h"
#include "language.h"
#include "charset.h"
#include "annotate.h"
#include "filenames.h"
#include "symfile.h"

#include "inferior.h"		/* for signed_pointer_to_address */

#include <sys/param.h>		/* For MAXPATHLEN */

#include "gdb_curses.h"

#include "ui-out.h"
#include "cli-out.h"

#include "readline/readline.h"

#ifdef USE_MMALLOC
#include "mmalloc.h"
#endif

#include "mach-o.h"

#if !HAVE_DECL_MALLOC
extern PTR malloc ();		/* OK: PTR */
#endif
#if !HAVE_DECL_REALLOC
extern PTR realloc ();		/* OK: PTR */
#endif
#if !HAVE_DECL_FREE
extern void free ();
#endif

/* readline defines this.  */
#undef savestring

void (*deprecated_error_begin_hook) (void);

/* Prototypes for local functions */

static void vfprintf_maybe_filtered (struct ui_file *, const char *,
				     va_list, int) ATTR_FORMAT (printf, 2, 0);

static void fputs_maybe_filtered (const char *, struct ui_file *, int);

static void do_my_cleanups (struct cleanup **, struct cleanup *);

static void prompt_for_continue (void);

static void set_width_command (char *, int, struct cmd_list_element *);

/* Chain of cleanup actions established with make_cleanup,
   to be executed if an error happens.  */

static struct cleanup *cleanup_chain;	/* cleaned up after a failed command */
static struct cleanup *final_cleanup_chain;	/* cleaned up when gdb exits */
static struct cleanup *run_cleanup_chain;	/* cleaned up on each 'run' */

/* APPLE LOCAL: Comment on the exec_cleanup_chain.  This is different
   from the standard cleanup chain, in that it is NOT preserved across
   calls to catch_exceptions the way the cleanup_chain is.  That means
   you really should NEVER hold onto a pointer into the cleanup chain
   across code that might error.  Otherwise, in the throw_exceptions
   code the exec_cleanup chain will get emptied, and when you go to
   call do_exec_cleanups with your preserved old_chain pointer, the
   exec_cleanup chain will already be NULL & gdb will crash.

   Unfortunately, there are several places where this is done in the
   generic code, and it isn't clear how to fix them.

   I tried preserving the exec_cleanup_chain in the catcher function,
   but that didn't work because the only place you actually know to do
   exec cleanups is in the continuation for the command that started
   the target running, and you only get one shot at that.  If you have
   split the chain into two pieces across a catch call, the part that
   was stored away in the catcher will never get done.

   In the end, I fixed this by making do_exec_cleanups check first
   whether the cleanup chain was NULL before actually trying to do the
   cleanup.  This only happens when throw_exceptions has already done
   the cleanup, so while potentially incorrect (because out of order)
   this is benign.  */

static struct cleanup *exec_cleanup_chain;	/* cleaned up on each execution command */
/* cleaned up on each error from within an execution command */
static struct cleanup *exec_error_cleanup_chain;

/* Pointer to what is left to do for an execution command after the
   target stops. Used only in asynchronous mode, by targets that
   support async execution.  The finish and until commands use it. So
   does the target extended-remote command. */
struct continuation *cmd_continuation;
struct continuation *intermediate_continuation;

/* APPLE LOCAL: Used to clean up the ObjC "debugger mode" when we go back to
   ordinary execution.  */
static struct cleanup *hand_call_cleanup_chain;

/* Nonzero if we have job control. */

int job_control;

/* Nonzero means a quit has been requested.  */

int quit_flag;

/* Nonzero means quit immediately if Control-C is typed now, rather
   than waiting until QUIT is executed.  Be careful in setting this;
   code which executes with immediate_quit set has to be very careful
   about being able to deal with being interrupted at any time.  It is
   almost always better to use QUIT; the only exception I can think of
   is being able to quit out of a system call (using EINTR loses if
   the SIGINT happens between the previous QUIT and the system call).
   To immediately quit in the case in which a SIGINT happens between
   the previous QUIT and setting immediate_quit (desirable anytime we
   expect to block), call QUIT after setting immediate_quit.  */

int immediate_quit;

/* Nonzero means that encoded C++/ObjC names should be printed out in their
   C++/ObjC form rather than raw.  */

int demangle = 1;
static void
show_demangle (struct ui_file *file, int from_tty,
	       struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("\
Demangling of encoded C++/ObjC names when displaying symbols is %s.\n"),
		    value);
}

/* Nonzero means that encoded C++/ObjC names should be printed out in their
   C++/ObjC form even in assembler language displays.  If this is set, but
   DEMANGLE is zero, names are printed raw, i.e. DEMANGLE controls.  */

int asm_demangle = 0;
static void
show_asm_demangle (struct ui_file *file, int from_tty,
		   struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("\
Demangling of C++/ObjC names in disassembly listings is %s.\n"),
		    value);
}

/* Nonzero means that strings with character values >0x7F should be printed
   as octal escapes.  Zero means just print the value (e.g. it's an
   international character, and the terminal or window can cope.)  */

int sevenbit_strings = 0;
static void
show_sevenbit_strings (struct ui_file *file, int from_tty,
		       struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("\
Printing of 8-bit characters in strings as \\nnn is %s.\n"),
		    value);
}

/* String to be printed before error messages, if any.  */

char *error_pre_print;

/* String to be printed before quit messages, if any.  */

char *quit_pre_print;

/* String to be printed before warning messages, if any.  */

char *warning_pre_print = "\nwarning: ";

int pagination_enabled = 1;
static void
show_pagination_enabled (struct ui_file *file, int from_tty,
			 struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("State of pagination is %s.\n"), value);
}



/* Add a new cleanup to the cleanup_chain,
   and return the previous chain pointer
   to be passed later to do_cleanups or discard_cleanups.
   Args are FUNCTION to clean up with, and ARG to pass to it.  */

struct cleanup *
make_cleanup (make_cleanup_ftype *function, void *arg)
{
  return make_my_cleanup (&cleanup_chain, function, arg);
}

struct cleanup *
make_final_cleanup (make_cleanup_ftype *function, void *arg)
{
  return make_my_cleanup (&final_cleanup_chain, function, arg);
}

struct cleanup *
make_run_cleanup (make_cleanup_ftype *function, void *arg)
{
  return make_my_cleanup (&run_cleanup_chain, function, arg);
}

struct cleanup *
make_exec_cleanup (make_cleanup_ftype *function, void *arg)
{
  return make_my_cleanup (&exec_cleanup_chain, function, arg);
}

struct cleanup *
make_exec_error_cleanup (make_cleanup_ftype *function, void *arg)
{
  return make_my_cleanup (&exec_error_cleanup_chain, function, arg);
}

struct cleanup *
make_hand_call_cleanup (make_cleanup_ftype *function, void *arg)
{
  return make_my_cleanup (&hand_call_cleanup_chain, function, arg);
}

static void
do_freeargv (void *arg)
{
  freeargv ((char **) arg);
}

struct cleanup *
make_cleanup_freeargv (char **arg)
{
  return make_my_cleanup (&cleanup_chain, do_freeargv, arg);
}

static void
do_bfd_close_cleanup (void *arg)
{
  bfd_close (arg);
}

struct cleanup *
make_cleanup_bfd_close (bfd *abfd)
{
  return make_cleanup (do_bfd_close_cleanup, abfd);
}

static void
do_close_cleanup (void *arg)
{
  int *fd = arg;
  close (*fd);
  xfree (fd);
}

struct cleanup *
make_cleanup_close (int fd)
{
  int *saved_fd = xmalloc (sizeof (fd));
  *saved_fd = fd;
  return make_cleanup (do_close_cleanup, saved_fd);
}

static void
do_ui_file_delete (void *arg)
{
  ui_file_delete (arg);
}

struct cleanup *
make_cleanup_ui_file_delete (struct ui_file *arg)
{
  return make_my_cleanup (&cleanup_chain, do_ui_file_delete, arg);
}

static void 
do_ui_out_delete (void *arg) 
{ 
  ui_out_delete (arg); 
} 
 
struct cleanup * 
make_cleanup_ui_out_delete (struct ui_out *arg) 
{ 
  return make_my_cleanup (&cleanup_chain, do_ui_out_delete, arg); 
} 

static void
do_restore_uiout_cleanup (void *arg)
{
  uiout = (struct ui_out *) arg;
}

static void
do_restore_output (void *data)
{
  ui_file_rewind (gdb_null);
  uiout = (struct ui_out *) data;
}

/* Use this call if you want to suppress output.  It does this by
   swapping the ui_out you pass in with another that we will just
   dump later.  Then just call the cleanup returned to turn the
   output back on again.  */
struct cleanup *
make_cleanup_ui_out_suppress_output (struct ui_out *cur_uiout)
{
  struct ui_out *stored_uiout;
  static struct ui_out *null_uiout = NULL;
  if (null_uiout == NULL)
    null_uiout = cli_out_new (gdb_null);
  if (null_uiout == NULL)
    error ("Unable to open null uiout in utils.c.");
  stored_uiout = uiout;
  uiout = null_uiout;

  return make_cleanup (do_restore_output, stored_uiout);
}

static void
do_free_section_addr_info (void *arg)
{
  free_section_addr_info (arg);
}

struct cleanup *
make_cleanup_restore_uiout (struct ui_out *old_uiout)
{
  return make_my_cleanup (&cleanup_chain, do_restore_uiout_cleanup, old_uiout);
}


static void
do_set_schedlock_mode (void *in_mode)
{
  enum scheduler_locking_mode mode = (enum scheduler_locking_mode) in_mode;
  set_scheduler_locking_mode (mode);
}

struct cleanup *
make_cleanup_set_restore_scheduler_locking_mode (enum scheduler_locking_mode new_mode)
{
  enum scheduler_locking_mode old_mode = set_scheduler_locking_mode (new_mode);
  return make_my_cleanup (&cleanup_chain, do_set_schedlock_mode, (void *) old_mode);
}

struct cleanup *
make_cleanup_free_section_addr_info (struct section_addr_info *addrs)
{
  return make_my_cleanup (&cleanup_chain, do_free_section_addr_info, addrs);
}


struct cleanup *
make_my_cleanup (struct cleanup **pmy_chain, make_cleanup_ftype *function,
		 void *arg)
{
  struct cleanup *new;
  struct cleanup *old_chain = *pmy_chain;

  if (!function)
    internal_error (__FILE__, __LINE__, 
		    "Someone tried to put a null function on the cleanup chain!");

  new = (struct cleanup *) xmalloc (sizeof (struct cleanup));

  new->next = *pmy_chain;
  new->function = function;
  new->arg = arg;
  *pmy_chain = new;

  return old_chain;
}

/* Discard cleanups and do the actions they describe
   until we get back to the point OLD_CHAIN in the cleanup_chain.  */

void
do_cleanups (struct cleanup *old_chain)
{
  do_my_cleanups (&cleanup_chain, old_chain);
}

void
do_final_cleanups (struct cleanup *old_chain)
{
  do_my_cleanups (&final_cleanup_chain, old_chain);
}

void
do_run_cleanups (struct cleanup *old_chain)
{
  do_my_cleanups (&run_cleanup_chain, old_chain);
}

void
do_exec_cleanups (struct cleanup *old_chain)
{
  /* APPLE LOCAL: We can't assume that the exec_cleanup_chain has been
     preserved across catch_exceptions calls, so we need to check
     whether it is NULL before we pass it into do_my_cleanups.

     See the comment before the def'n of exec_cleanup_chain for more
     details.  */

  if (exec_cleanup_chain == NULL)
    return;

  do_my_cleanups (&exec_cleanup_chain, old_chain);
}

void
do_exec_error_cleanups (struct cleanup *old_chain)
{
  do_my_cleanups (&exec_error_cleanup_chain, old_chain);
}

void
do_hand_call_cleanups (struct cleanup *old_chain)
{
  if (debug_handcall_setup && hand_call_cleanup_chain != NULL)
    printf_unfiltered ("Executing hand call cleanups.\n");
  do_my_cleanups (&hand_call_cleanup_chain, old_chain);
  if (debug_handcall_setup && hand_call_cleanup_chain != NULL)
    printf_unfiltered ("Done executing hand call cleanups.\n");
}

static void
do_my_cleanups (struct cleanup **pmy_chain,
		struct cleanup *old_chain)
{
  struct cleanup *ptr;
  while ((ptr = *pmy_chain) != old_chain)
    {
      *pmy_chain = ptr->next;	/* Do this first incase recursion */
      (*ptr->function) (ptr->arg);
      xfree (ptr);
    }
}

/* Discard cleanups, not doing the actions they describe,
   until we get back to the point OLD_CHAIN in the cleanup_chain.  */

void
discard_cleanups (struct cleanup *old_chain)
{
  discard_my_cleanups (&cleanup_chain, old_chain);
}

void
discard_final_cleanups (struct cleanup *old_chain)
{
  discard_my_cleanups (&final_cleanup_chain, old_chain);
}

void
discard_exec_error_cleanups (struct cleanup *old_chain)
{
  discard_my_cleanups (&exec_error_cleanup_chain, old_chain);
}

void
discard_hand_call_cleanups (struct cleanup *old_chain)
{
  if (debug_handcall_setup && hand_call_cleanup_chain != NULL)
    printf_unfiltered ("Discarding hand call cleanups.\n");

  discard_my_cleanups (&hand_call_cleanup_chain, old_chain);
}

void
discard_my_cleanups (struct cleanup **pmy_chain,
		     struct cleanup *old_chain)
{
  struct cleanup *ptr;
  while ((ptr = *pmy_chain) != old_chain)
    {
      *pmy_chain = ptr->next;
      xfree (ptr);
    }
}

/* Set the cleanup_chain to 0, and return the old cleanup chain.  */
struct cleanup *
save_cleanups (void)
{
  return save_my_cleanups (&cleanup_chain);
}

struct cleanup *
save_final_cleanups (void)
{
  return save_my_cleanups (&final_cleanup_chain);
}

struct cleanup *
save_my_cleanups (struct cleanup **pmy_chain)
{
  struct cleanup *old_chain = *pmy_chain;

  *pmy_chain = 0;
  return old_chain;
}

/* Restore the cleanup chain from a previously saved chain.  */
void
restore_cleanups (struct cleanup *chain)
{
  restore_my_cleanups (&cleanup_chain, chain);
}

void
restore_final_cleanups (struct cleanup *chain)
{
  restore_my_cleanups (&final_cleanup_chain, chain);
}

void
restore_my_cleanups (struct cleanup **pmy_chain, struct cleanup *chain)
{
  *pmy_chain = chain;
}

/* This function is useful for cleanups.
   Do

   foo = xmalloc (...);
   old_chain = make_cleanup (free_current_contents, &foo);

   to arrange to free the object thus allocated.  */

void
free_current_contents (void *ptr)
{
  void **location = ptr;
  if (location == NULL)
    internal_error (__FILE__, __LINE__,
		    _("free_current_contents: NULL pointer"));
  if (*location != NULL)
    {
      xfree (*location);
      *location = NULL;
    }
}

/* Provide a known function that does nothing, to use as a base for
   for a possibly long chain of cleanups.  This is useful where we
   use the cleanup chain for handling normal cleanups as well as dealing
   with cleanups that need to be done as a result of a call to error().
   In such cases, we may not be certain where the first cleanup is, unless
   we have a do-nothing one to always use as the base. */

void
null_cleanup (void *arg)
{
}

/* Add a continuation to the continuation list, the global list
   cmd_continuation. The new continuation will be added at the front.*/
void
add_continuation (void (*continuation_hook) (struct continuation_arg *),
		  struct continuation_arg *arg_list)
{
  struct continuation *continuation_ptr;

  continuation_ptr =
    (struct continuation *) xmalloc (sizeof (struct continuation));
  continuation_ptr->continuation_hook = continuation_hook;
  continuation_ptr->arg_list = arg_list;
  continuation_ptr->next = cmd_continuation;
  cmd_continuation = continuation_ptr;
}

/* Walk down the cmd_continuation list, and execute all the
   continuations. There is a problem though. In some cases new
   continuations may be added while we are in the middle of this
   loop. If this happens they will be added in the front, and done
   before we have a chance of exhausting those that were already
   there. We need to then save the beginning of the list in a pointer
   and do the continuations from there on, instead of using the
   global beginning of list as our iteration pointer.  */
void
do_all_continuations (void)
{
  struct continuation *continuation_ptr;
  struct continuation *saved_continuation;

  /* Copy the list header into another pointer, and set the global
     list header to null, so that the global list can change as a side
     effect of invoking the continuations and the processing of
     the preexisting continuations will not be affected. */
  continuation_ptr = cmd_continuation;
  cmd_continuation = NULL;

  /* Work now on the list we have set aside.  */
  while (continuation_ptr)
    {
      (continuation_ptr->continuation_hook) (continuation_ptr->arg_list);
      saved_continuation = continuation_ptr;
      continuation_ptr = continuation_ptr->next;
      xfree (saved_continuation);
    }
}

/* Walk down the cmd_continuation list, and get rid of all the
   continuations. */
void
discard_all_continuations (void)
{
  struct continuation *continuation_ptr;

  while (cmd_continuation)
    {
      continuation_ptr = cmd_continuation;
      cmd_continuation = continuation_ptr->next;
      xfree (continuation_ptr);
    }
}

/* Add a continuation to the continuation list, the global list
   intermediate_continuation.  The new continuation will be added at
   the front.  */
void
add_intermediate_continuation (void (*continuation_hook)
			       (struct continuation_arg *),
			       struct continuation_arg *arg_list)
{
  struct continuation *continuation_ptr;

  continuation_ptr =
    (struct continuation *) xmalloc (sizeof (struct continuation));
  continuation_ptr->continuation_hook = continuation_hook;
  continuation_ptr->arg_list = arg_list;
  continuation_ptr->next = intermediate_continuation;
  intermediate_continuation = continuation_ptr;
}

/* Walk down the cmd_continuation list, and execute all the
   continuations. There is a problem though. In some cases new
   continuations may be added while we are in the middle of this
   loop. If this happens they will be added in the front, and done
   before we have a chance of exhausting those that were already
   there. We need to then save the beginning of the list in a pointer
   and do the continuations from there on, instead of using the
   global beginning of list as our iteration pointer.*/
void
do_all_intermediate_continuations (void)
{
  struct continuation *continuation_ptr;
  struct continuation *saved_continuation;

  /* Copy the list header into another pointer, and set the global
     list header to null, so that the global list can change as a side
     effect of invoking the continuations and the processing of
     the preexisting continuations will not be affected. */
  continuation_ptr = intermediate_continuation;
  intermediate_continuation = NULL;

  /* Work now on the list we have set aside.  */
  while (continuation_ptr)
    {
      (continuation_ptr->continuation_hook) (continuation_ptr->arg_list);
      saved_continuation = continuation_ptr;
      continuation_ptr = continuation_ptr->next;
      xfree (saved_continuation);
    }
}

/* Walk down the cmd_continuation list, and get rid of all the
   continuations. */
void
discard_all_intermediate_continuations (void)
{
  struct continuation *continuation_ptr;

  while (intermediate_continuation)
    {
      continuation_ptr = intermediate_continuation;
      intermediate_continuation = continuation_ptr->next;
      xfree (continuation_ptr);
    }
}



/* Print a warning message.  The first argument STRING is the warning
   message, used as an fprintf format string, the second is the
   va_list of arguments for that string.  A warning is unfiltered (not
   paginated) so that the user does not need to page through each
   screen full of warnings when there are lots of them.  */

void
vwarning (const char *string, va_list args)
{
  if (deprecated_warning_hook)
    (*deprecated_warning_hook) (string, args);
  else
    {
      target_terminal_ours ();
      wrap_here ("");		/* Force out any buffered output */
      gdb_flush (gdb_stdout);
      if (warning_pre_print)
	fputs_unfiltered (warning_pre_print, gdb_stderr);
      vfprintf_unfiltered (gdb_stderr, string, args);
      fprintf_unfiltered (gdb_stderr, "\n");
      va_end (args);
    }
}

/* Print a warning message.
   The first argument STRING is the warning message, used as a fprintf string,
   and the remaining args are passed as arguments to it.
   The primary difference between warnings and errors is that a warning
   does not force the return to command level.  */

void
warning (const char *string, ...)
{
  va_list args;
  va_start (args, string);
  vwarning (string, args);
  va_end (args);
}

/* Print an error message and return to command level.
   The first argument STRING is the error message, used as a fprintf string,
   and the remaining args are passed as arguments to it.  */

NORETURN void
verror (const char *string, va_list args)
{
  throw_verror (GENERIC_ERROR, string, args);
}

NORETURN void
error (const char *string, ...)
{
  va_list args;
  va_start (args, string);
  throw_verror (GENERIC_ERROR, string, args);
  va_end (args);
}

/* Print an error message and quit.
   The first argument STRING is the error message, used as a fprintf string,
   and the remaining args are passed as arguments to it.  */

NORETURN void
vfatal (const char *string, va_list args)
{
  throw_vfatal (string, args);
}

NORETURN void
fatal (const char *string, ...)
{
  va_list args;
  va_start (args, string);
  throw_vfatal (string, args);
  va_end (args);
}

NORETURN void
error_stream (struct ui_file *stream)
{
  long len;
  char *message = ui_file_xstrdup (stream, &len);
  make_cleanup (xfree, message);
  error (("%s"), message);
}

/* Print a message reporting an internal error/warning. Ask the user
   if they want to continue, dump core, or just exit.  Return
   something to indicate a quit.  */

struct internal_problem
{
  const char *name;
  /* FIXME: cagney/2002-08-15: There should be ``maint set/show''
     commands available for controlling these variables.  */
  enum auto_boolean should_quit;
  enum auto_boolean should_dump_core;
};

/* Report a problem, internal to GDB, to the user.  Once the problem
   has been reported, and assuming GDB didn't quit, the caller can
   either allow execution to resume or throw an error.  */

static void ATTR_FORMAT (printf, 4, 0)
internal_vproblem (struct internal_problem *problem,
		   const char *file, int line, const char *fmt, va_list ap)
{
  static int dejavu;
  int quit_p;
  int dump_core_p;
  char *reason;

  /* Don't allow infinite error/warning recursion.  */
  {
    static char msg[] = "Recursive internal problem.\n";
    switch (dejavu)
      {
      case 0:
	dejavu = 1;
	break;
      case 1:
	dejavu = 2;
	fputs_unfiltered (msg, gdb_stderr);
	abort ();	/* NOTE: GDB has only three calls to abort().  */
      default:
	dejavu = 3;
	write (STDERR_FILENO, msg, sizeof (msg));
	exit (1);
      }
  }

  if (! gdb_stderr) {
    fprintf (stderr, "gdb-internal-error: ");
    vfprintf (stderr, fmt, ap);
    fputs ("\n", stderr);
    abort ();
  }    

  /* Try to get the message out and at the start of a new line.  */
  target_terminal_ours ();
  begin_line ();

  /* APPLE LOCAL: Do a stack crawl of how we got here so we're more likely
     to get useful bug reports.  */
  {
    void *bt_buffer[15];
    int count = backtrace (bt_buffer, 15);
    fprintf (stderr, "gdb stack crawl at point of internal error:\n");
    backtrace_symbols_fd (bt_buffer, count, STDERR_FILENO);
  }

  /* Create a string containing the full error/warning message.  Need
     to call query with this full string, as otherwize the reason
     (error/warning) and question become separated.  Format using a
     style similar to a compiler error message.  Include extra detail
     so that the user knows that they are living on the edge.  */
  {
    char *msg;
    msg = xstrvprintf (fmt, ap);
    reason = xstrprintf ("\
%s:%d: %s: %s\n\
A problem internal to GDB has been detected,\n\
further debugging may prove unreliable.", file, line, problem->name, msg);
    xfree (msg);
    make_cleanup (xfree, reason);
  }

  switch (problem->should_quit)
    {
    case AUTO_BOOLEAN_AUTO:
      /* Default (yes/batch case) is to quit GDB.  When in batch mode
         this lessens the likelhood of GDB going into an infinate
         loop.  */
      quit_p = query (_("%s\nQuit this debugging session? "), reason);
      break;
    case AUTO_BOOLEAN_TRUE:
      quit_p = 1;
      break;
    case AUTO_BOOLEAN_FALSE:
      quit_p = 0;
      break;
    default:
      internal_error (__FILE__, __LINE__, _("bad switch"));
    }

  switch (problem->should_dump_core)
    {
    case AUTO_BOOLEAN_AUTO:
      /* Default (yes/batch case) is to dump core.  This leaves a GDB
         `dropping' so that it is easier to see that something went
         wrong in GDB.  */
      dump_core_p = query (_("%s\nCreate a core file of GDB? "), reason);
      break;
      break;
    case AUTO_BOOLEAN_TRUE:
      dump_core_p = 1;
      break;
    case AUTO_BOOLEAN_FALSE:
      dump_core_p = 0;
      break;
    default:
      internal_error (__FILE__, __LINE__, _("bad switch"));
    }

  if (quit_p)
    {
      if (dump_core_p)
	abort ();		/* NOTE: GDB has only three calls to abort().  */
      else
       {
         /* APPLE LOCAL: If this was auto-answered, then the message
            hasn't gotten printed out yet.  Do that before exiting so
            our parent (like Xcode) can pick up the error.  */
         if (quit_p == 2)
           printf_filtered ("%s\n",reason);
         exit (1);
       }
    }
  else
    {
      if (dump_core_p)
	{
#ifdef HAVE_WORKING_FORK
	  if (fork () == 0)
	    abort ();		/* NOTE: GDB has only three calls to abort().  */
#endif
	}
    }

  dejavu = 0;
}

/* APPLE LOCAL: Default to not dumping core for gdb.
   No one ever does, and at this point you're already
   pissed off that gdb tripped--making the user answer
   lots of questions just pisses them off more.  */
static struct internal_problem internal_error_problem = {
  "internal-error", AUTO_BOOLEAN_AUTO, AUTO_BOOLEAN_FALSE
};

NORETURN void
internal_verror (const char *file, int line, const char *fmt, va_list ap)
{
  internal_vproblem (&internal_error_problem, file, line, fmt, ap);
  deprecated_throw_reason (RETURN_ERROR);
}

NORETURN void
internal_error (const char *file, int line, const char *string, ...)
{
  va_list ap;
  va_start (ap, string);
  internal_verror (file, line, string, ap);
  va_end (ap);
}

/* APPLE LOCAL: Default to not dumping core for gdb.
   No one ever does, and at this point you're already
   pissed off that gdb tripped--making the user answer
   lots of questions just pisses them off more.  */
static struct internal_problem internal_warning_problem = {
  "internal-error", AUTO_BOOLEAN_AUTO, AUTO_BOOLEAN_FALSE
};

void
internal_vwarning (const char *file, int line, const char *fmt, va_list ap)
{
  internal_vproblem (&internal_warning_problem, file, line, fmt, ap);
}

void
internal_warning (const char *file, int line, const char *string, ...)
{
  va_list ap;
  va_start (ap, string);
  internal_vwarning (file, line, string, ap);
  va_end (ap);
}

/* The strerror() function can return NULL for errno values that are
   out of range.  Provide a "safe" version that always returns a
   printable string. */

char *
safe_strerror (int errnum)
{
  char *msg;

  msg = strerror (errnum);
  if (msg == NULL)
    {
      static char buf[32];
      xsnprintf (buf, sizeof buf, "(undocumented errno %d)", errnum);
      msg = buf;
    }
  return (msg);
}

/* Print the system error message for errno, and also mention STRING
   as the file name for which the error was encountered.
   Then return to command level.  */

NORETURN void
perror_with_name (const char *string)
{
  char *err;
  char *combined;

  err = safe_strerror (errno);
  combined = (char *) alloca (strlen (err) + strlen (string) + 3);
  strcpy (combined, string);
  strcat (combined, ": ");
  strcat (combined, err);

  /* I understand setting these is a matter of taste.  Still, some people
     may clear errno but not know about bfd_error.  Doing this here is not
     unreasonable. */
  bfd_set_error (bfd_error_no_error);
  errno = 0;

  error ("%s", combined);
}

/* Print the system error message for ERRCODE, and also mention STRING
   as the file name for which the error was encountered.  */

void
print_sys_errmsg (const char *string, int errcode)
{
  char *err;
  char *combined;

  err = safe_strerror (errcode);
  combined = (char *) alloca (strlen (err) + strlen (string) + 3);
  strcpy (combined, string);
  strcat (combined, ": ");
  strcat (combined, err);

  /* We want anything which was printed on stdout to come out first, before
     this message.  */
  gdb_flush (gdb_stdout);
  fprintf_unfiltered (gdb_stderr, "%s.\n", combined);
}

/* Control C eventually causes this to be called, at a convenient time.  */

void
quit (void)
{
#ifdef __MSDOS__
  /* No steenking SIGINT will ever be coming our way when the
     program is resumed.  Don't lie.  */
  fatal ("Quit");
#else
  if (job_control
      /* If there is no terminal switching for this target, then we can't
         possibly get screwed by the lack of job control.  */
      || current_target.to_terminal_ours == NULL)
    fatal ("Quit");
  else
    fatal ("Quit (expect signal SIGINT when the program is resumed)");
#endif
}

/* Control C comes here */
void
request_quit (int signo)
{
  quit_flag = 1;
  /* Restore the signal handler.  Harmless with BSD-style signals,
     needed for System V-style signals.  */
  signal (signo, request_quit);

  if (immediate_quit)
    quit ();
}

/* Memory management stuff (malloc friends).  */

#if !defined (USE_MMALLOC)

static void *
mmalloc (void *md, size_t size)
{
  return malloc (size);		/* NOTE: GDB's only call to malloc() */
}

static void *
mrealloc (void *md, void *ptr, size_t size)
{
  if (ptr == 0)			/* Guard against old realloc's */
    return mmalloc (md, size);
  else
    return realloc (ptr, size);	/* NOTE: GDB's only call to ralloc() */
}

static void *
mcalloc (void *md, size_t number, size_t size)
{
  return calloc (number, size);	/* NOTE: GDB's only call to calloc() */
}

static void
mfree (void *md, void *ptr)
{
  free (ptr);			/* NOTE: GDB's only call to free() */
}

#endif /* USE_MMALLOC */

#if !defined (USE_MMALLOC)

void *
init_malloc (void *md)
{
  return md;
}

#else /* Have mmalloc and want corruption checking */

void *
init_malloc (void *md)
{
  return mmalloc_check_create (md);
}

void
init_mmalloc_default_pool (void *md)
{
  char *s;

  /* xmalloc_set_malloc_hooks (gxmalloc, gxcalloc, gxrealloc, gxfree); */

  s = getenv ("GDB_ENABLE_PAGECHECK");
  if (s != NULL)
    md = mmalloc_pagecheck_create ();
  else
    md = mmalloc_malloc_create ();

  if (md == NULL)
    internal_error (__FILE__, __LINE__, "unable to create default mmalloc allocator");

  s = getenv ("GDB_ENABLE_MMALLOC_CHECK");
  if (s != NULL)
    {
      md = mmalloc_check_create (md);
      if (md == NULL)
	internal_error (__FILE__, __LINE__, "unable to add error-checking to default mmalloc allocator");
    }

  mmalloc_set_default_allocator (md);
}

#endif /* Have mmalloc and want corruption checking  */

/* Called when a memory allocation fails, with the number of bytes of
   memory requested in SIZE. */
 
NORETURN void 
nomem (long size) 
{
  if (size > 0)
    {
      internal_error (__FILE__, __LINE__,
		      _("virtual memory exhausted: can't allocate %ld bytes."),
		      size);
    }
  else
    {
      internal_error (__FILE__, __LINE__, _("virtual memory exhausted."));
    }
}

/* APPLE LOCAL begin malloc */
/* The xmmalloc() family of memory management routines.

   These are are like the mmalloc() family except that they implement
   consistent semantics and guard against typical memory management
   problems: if a malloc fails, an internal error is thrown; if
   free(NULL) is called, it is ignored; if *alloc(0) is called, NULL
   is returned.

   All these routines are implemented using the mmalloc() family. */

void *
xmmalloc (void *md, size_t size)
{
  void *val;

  /* See libiberty/xmalloc.c.  This function need's to match that's
     semantics.  It never returns NULL.  */
  if (size == 0)
    size = 1;

  val = mmalloc (md, size);
  if (val == NULL)
    nomem (size);

  return (val);
}

void *
xmrealloc (void *md, void *ptr, size_t size)
{
  void *val;

  /* See libiberty/xmalloc.c.  This function need's to match that's
     semantics.  It never returns NULL.  */
  if (size == 0)
    size = 1;

  if (ptr != NULL)
    val = mrealloc (md, ptr, size);
  else
    val = mmalloc (md, size);
  if (val == NULL)
    nomem (size);

  return (val);
}

void *
xmcalloc (void *md, size_t number, size_t size)
{
  void *mem;

  /* See libiberty/xmalloc.c.  This function need's to match that's
     semantics.  It never returns NULL.  */
  if (number == 0 || size == 0)
    {
      number = 1;
      size = 1;
    }

  mem = mcalloc (md, number, size);
  if (mem == NULL)
    nomem (number * size);

  return mem;
}

void
xmfree (void *md, void *ptr)
{
  if (ptr != NULL)
    mfree (md, ptr);
}
/* APPLE LOCAL end malloc */

/* The xmalloc() (libiberty.h) family of memory management routines.

   These are like the ISO-C malloc() family except that they implement
   consistent semantics and guard against typical memory management
   problems.  */

/* NOTE: These are declared using PTR to ensure consistency with
   "libiberty.h".  xfree() is GDB local.  */

PTR				/* OK: PTR */
xmalloc (size_t size)
{
  void *val;

  /* See libiberty/xmalloc.c.  This function need's to match that's
     semantics.  It never returns NULL.  */
  if (size == 0)
    size = 1;

  val = malloc (size);		/* OK: malloc */
  if (val == NULL)
    nomem (size);

  return (val);
}

void *
xzalloc (size_t size)
{
  return xcalloc (1, size);
}

PTR				/* OK: PTR */
xrealloc (PTR ptr, size_t size)	/* OK: PTR */
{
  void *val;

  /* See libiberty/xmalloc.c.  This function need's to match that's
     semantics.  It never returns NULL.  */
  if (size == 0)
    size = 1;

  if (ptr != NULL)
    val = realloc (ptr, size);	/* OK: realloc */
  else
    val = malloc (size);		/* OK: malloc */
  if (val == NULL)
    nomem (size);

  return (val);
}

PTR				/* OK: PTR */
xcalloc (size_t number, size_t size)
{
  void *mem;

  /* See libiberty/xmalloc.c.  This function need's to match that's
     semantics.  It never returns NULL.  */
  if (number == 0 || size == 0)
    {
      number = 1;
      size = 1;
    }

  mem = calloc (number, size);		/* OK: xcalloc */
  if (mem == NULL)
    nomem (number * size);

  return mem;
}

void
xfree (void *ptr)
{
  if (ptr != NULL)
    free (ptr);		/* OK: free */
}

/* The xmalloc() (libiberty.h) family of memory management routines.

   These are like the ISO-C malloc() family except that they implement
   consistent semantics and guard against typical memory management
   problems.  See xmmalloc() above for further information.

   All these routines are wrappers to the xmmalloc() family. */

/* NOTE: These are declared using PTR to ensure consistency with
   "libiberty.h".  xfree() is GDB local.  */

PTR				/* OK: PTR */
gmalloc (size_t size)
{
  return xmmalloc (NULL, size);
}

PTR				/* OK: PTR */
grealloc (PTR ptr, size_t size)	/* OK: PTR */
{
  return xmrealloc (NULL, ptr, size);
}

PTR				/* OK: PTR */
gcalloc (size_t number, size_t size)
{
  return xmcalloc (NULL, number, size);
}

void
gfree (void *ptr)
{
  xmfree (NULL, ptr);
}


/* Like asprintf/vasprintf but get an internal_error if the call
   fails. */

char *
xstrprintf (const char *format, ...)
{
  char *ret;
  va_list args;
  va_start (args, format);
  ret = xstrvprintf (format, args);
  va_end (args);
  return ret;
}

void
xasprintf (char **ret, const char *format, ...)
{
  va_list args;
  va_start (args, format);
  (*ret) = xstrvprintf (format, args);
  va_end (args);
}

void
xvasprintf (char **ret, const char *format, va_list ap)
{
  /* NULL could be returned due to a memory allocation problem; a
     badly format string; or something else. */
  if ((*ret) == NULL)
    internal_error (__FILE__, __LINE__,
		    "vasprintf returned NULL buffer (errno %d)", errno);
  /* A negative status with a non-NULL buffer shouldn't never
     happen. But to be sure. */
  (*ret) = xstrvprintf (format, ap);
}

char *
xstrvprintf (const char *format, va_list ap)
{
  char *ret = NULL;
  int status = vasprintf (&ret, format, ap);
  /* NULL is returned when there was a memory allocation problem.  */
  if (ret == NULL)
    nomem (0);
  /* A negative status (the printed length) with a non-NULL buffer
     should never happen, but just to be sure.  */
  if (status < 0)
    internal_error (__FILE__, __LINE__,
		    _("vasprintf call failed (errno %d)"), errno);
  return ret;
}

int
xsnprintf (char *str, size_t size, const char *format, ...)
{
  va_list args;
  int ret;

  va_start (args, format);
  ret = vsnprintf (str, size, format, args);
  gdb_assert (ret < size);
  va_end (args);

  return ret;
}

/* My replacement for the read system call.
   Used like `read' but keeps going if `read' returns too soon.  */

int
myread (int desc, char *addr, int len)
{
  int val;
  int orglen = len;

  while (len > 0)
    {
      val = read (desc, addr, len);
      if (val < 0)
	return val;
      if (val == 0)
	return orglen - len;
      len -= val;
      addr += val;
    }
  return orglen;
}

/* Make a copy of the string at PTR with SIZE characters
   (and add a null character at the end in the copy).
   Uses malloc to get the space.  Returns the address of the copy.  */

char *
savestring (const char *ptr, size_t size)
{
  char *p = (char *) xmalloc (size + 1);
  memcpy (p, ptr, size);
  p[size] = 0;
  return p;
}

void
print_spaces (int n, struct ui_file *file)
{
  fputs_unfiltered (n_spaces (n), file);
}

/* Print a host address.  */

void
gdb_print_host_address (const void *addr, struct ui_file *stream)
{

  /* We could use the %p conversion specifier to fprintf if we had any
     way of knowing whether this host supports it.  But the following
     should work on the Alpha and on 32 bit machines.  */

  fprintf_filtered (stream, "0x%lx", (unsigned long) addr);
}

/* Ask user a y-or-n question and return 1 iff answer is yes.
   Takes three args which are given to printf to print the question.
   The first, a control string, should end in "? ".
   It should not say how to answer, because we do that.  
   APPLE LOCAL: return 2 if the query was auto-answered.  Do this
   because for internal_error, we want to print out the error message
   when run under the MI.  */

/* VARARGS */
int
query (const char *ctlstr, ...)
{
  va_list args;
  int answer;
  int ans2;
  int retval;

  if (deprecated_query_hook)
    {
      va_start (args, ctlstr);
      return deprecated_query_hook (ctlstr, args);
    }

  /* Automatically answer "yes" if input is not from a terminal.  */
  if (!input_from_terminal_p ())
    /* APPLE LOCAL - return 2 for the auto-answered case.  */
    return 2;

  while (1)
    {
      wrap_here ("");		/* Flush any buffered output */
      gdb_flush (gdb_stdout);

      if (annotation_level > 1)
	printf_filtered (("\n\032\032pre-query\n"));

      va_start (args, ctlstr);
      vfprintf_filtered (gdb_stdout, ctlstr, args);
      va_end (args);
      printf_filtered (_("(y or n) "));

      if (annotation_level > 1)
	printf_filtered (("\n\032\032query\n"));

      wrap_here ("");
      gdb_flush (gdb_stdout);

      answer = fgetc (stdin);
      clearerr (stdin);		/* in case of C-d */
      if (answer == EOF)	/* C-d */
	{
	  retval = 1;
	  break;
	}
      /* Eat rest of input line, to EOF or newline */
      if (answer != '\n')
	do
	  {
	    ans2 = fgetc (stdin);
	    clearerr (stdin);
	  }
	while (ans2 != EOF && ans2 != '\n' && ans2 != '\r');

      if (answer >= 'a')
	answer -= 040;
      if (answer == 'Y')
	{
	  retval = 1;
	  break;
	}
      if (answer == 'N')
	{
	  retval = 0;
	  break;
	}
      printf_filtered (_("Please answer y or n.\n"));
    }
  /* APPLE LOCAL: Reset QUIT_FLAG since this loop will continue until
     the user answers the question and will fail at some point in the
     future when the user isn't expecting it and possible crash gdb. This
     can happen if the user types "run", and is in the process of answering
     the question "The program being debugged has been started already.
     Start it from the beginning? (y or n)" and they hit ^C. This will cause
     resume in infrun.c to quit while trying to resume the program and leave
     gdb (at least the Apple version of gdb) in a state from which we can't
     continue and gdb will crash.  */
  quit_flag = 0;
  if (annotation_level > 1)
    printf_filtered (("\n\032\032post-query\n"));
  return retval;
}


/* This function supports the nquery() and yquery() functions.
   Ask user a y-or-n question and return 0 if answer is no, 1 if
   answer is yes, or default the answer to the specified default.
   DEFCHAR is either 'y' or 'n' and refers to the default answer.
   CTLSTR is the control string and should end in "? ".  It should
   not say how to answer, because we do that.
   ARGS are the arguments passed along with the CTLSTR argument to
   printf.  */

static int ATTR_FORMAT (printf, 1, 0)
defaulted_query (const char *ctlstr, const char defchar, va_list args)
{
  int answer;
  int ans2;
  int retval;
  int def_value;
  char def_answer, not_def_answer;
  char *y_string, *n_string;

  /* Set up according to which answer is the default.  */
  if (defchar == 'y')
    {
      def_value = 1;
      def_answer = 'Y';
      not_def_answer = 'N';
      y_string = "[y]";
      n_string = "n";
    }
  else
    {
      def_value = 0;
      def_answer = 'N';
      not_def_answer = 'Y';
      y_string = "y";
      n_string = "[n]";
    }

  if (deprecated_query_hook)
    {
      return deprecated_query_hook (ctlstr, args);
    }

  /* Automatically answer default value if input is not from a terminal.  */
  if (!input_from_terminal_p ())
    return def_value;

  while (1)
    {
      wrap_here ("");		/* Flush any buffered output */
      gdb_flush (gdb_stdout);

      if (annotation_level > 1)
	printf_filtered (("\n\032\032pre-query\n"));

      vfprintf_filtered (gdb_stdout, ctlstr, args);
      printf_filtered (_("(%s or %s) "), y_string, n_string);

      if (annotation_level > 1)
	printf_filtered (("\n\032\032query\n"));

      wrap_here ("");
      gdb_flush (gdb_stdout);

      answer = fgetc (stdin);
      clearerr (stdin);		/* in case of C-d */
      if (answer == EOF)	/* C-d */
	{
	  retval = def_value;
	  break;
	}
      /* Eat rest of input line, to EOF or newline */
      if (answer != '\n')
	do
	  {
	    ans2 = fgetc (stdin);
	    clearerr (stdin);
	  }
	while (ans2 != EOF && ans2 != '\n' && ans2 != '\r');

      if (answer >= 'a')
	answer -= 040;
      /* Check answer.  For the non-default, the user must specify
         the non-default explicitly.  */
      if (answer == not_def_answer)
	{
	  retval = !def_value;
	  break;
	}
      /* Otherwise, for the default, the user may either specify
         the required input or have it default by entering nothing.  */
      if (answer == def_answer || answer == '\n' || 
	  answer == '\r' || answer == EOF)
	{
	  retval = def_value;
	  break;
	}
      /* Invalid entries are not defaulted and require another selection.  */
      printf_filtered (_("Please answer %s or %s.\n"),
		       y_string, n_string);
    }

  if (annotation_level > 1)
    printf_filtered (("\n\032\032post-query\n"));
  return retval;
}


/* Ask user a y-or-n question and return 0 if answer is no, 1 if
   answer is yes, or 0 if answer is defaulted.
   Takes three args which are given to printf to print the question.
   The first, a control string, should end in "? ".
   It should not say how to answer, because we do that.  */

int
nquery (const char *ctlstr, ...)
{
  va_list args;

  va_start (args, ctlstr);
  return defaulted_query (ctlstr, 'n', args);
  va_end (args);
}

/* Ask user a y-or-n question and return 0 if answer is no, 1 if
   answer is yes, or 1 if answer is defaulted.
   Takes three args which are given to printf to print the question.
   The first, a control string, should end in "? ".
   It should not say how to answer, because we do that.  */

int
yquery (const char *ctlstr, ...)
{
  va_list args;

  va_start (args, ctlstr);
  return defaulted_query (ctlstr, 'y', args);
  va_end (args);
}

/* Print an error message saying that we couldn't make sense of a
   \^mumble sequence in a string or character constant.  START and END
   indicate a substring of some larger string that contains the
   erroneous backslash sequence, missing the initial backslash.  */
static NORETURN int
no_control_char_error (const char *start, const char *end)
{
  int len = end - start;
  char *copy = alloca (end - start + 1);

  memcpy (copy, start, len);
  copy[len] = '\0';

  error (_("There is no control character `\\%s' in the `%s' character set."),
	 copy, target_charset ());
}

/* Parse a C escape sequence.  STRING_PTR points to a variable
   containing a pointer to the string to parse.  That pointer
   should point to the character after the \.  That pointer
   is updated past the characters we use.  The value of the
   escape sequence is returned.

   A negative value means the sequence \ newline was seen,
   which is supposed to be equivalent to nothing at all.

   If \ is followed by a null character, we return a negative
   value and leave the string pointer pointing at the null character.

   If \ is followed by 000, we return 0 and leave the string pointer
   after the zeros.  A value of 0 does not mean end of string.  */

int
parse_escape (char **string_ptr)
{
  int target_char;
  int c = *(*string_ptr)++;
  if (c_parse_backslash (c, &target_char))
    return target_char;
  else
    switch (c)
      {
      case '\n':
	return -2;
      case 0:
	(*string_ptr)--;
	return 0;
      case '^':
	{
	  /* Remember where this escape sequence started, for reporting
	     errors.  */
	  char *sequence_start_pos = *string_ptr - 1;

	  c = *(*string_ptr)++;

	  if (c == '?')
	    {
	      /* XXXCHARSET: What is `delete' in the host character set?  */
	      c = 0177;

	      if (!host_char_to_target (c, &target_char))
		error (_("There is no character corresponding to `Delete' "
		       "in the target character set `%s'."), host_charset ());

	      return target_char;
	    }
	  else if (c == '\\')
	    target_char = parse_escape (string_ptr);
	  else
	    {
	      if (!host_char_to_target (c, &target_char))
		no_control_char_error (sequence_start_pos, *string_ptr);
	    }

	  /* Now target_char is something like `c', and we want to find
	     its control-character equivalent.  */
	  if (!target_char_to_control_char (target_char, &target_char))
	    no_control_char_error (sequence_start_pos, *string_ptr);

	  return target_char;
	}

	/* XXXCHARSET: we need to use isdigit and value-of-digit
	   methods of the host character set here.  */

      case '0':
      case '1':
      case '2':
      case '3':
      case '4':
      case '5':
      case '6':
      case '7':
	{
	  int i = c - '0';
	  int count = 0;
	  while (++count < 3)
	    {
	      c = (**string_ptr);
	      if (c >= '0' && c <= '7')
		{
		  (*string_ptr)++;
		  i *= 8;
		  i += c - '0';
		}
	      else
		{
		  break;
		}
	    }
	  return i;
	}
      default:
	if (!host_char_to_target (c, &target_char))
	  error
	    ("The escape sequence `\%c' is equivalent to plain `%c', which"
	     " has no equivalent\n" "in the `%s' character set.", c, c,
	     target_charset ());
	return target_char;
      }
}

/* Print the character C on STREAM as part of the contents of a literal
   string whose delimiter is QUOTER.  Note that this routine should only
   be call for printing things which are independent of the language
   of the program being debugged. */

static void
printchar (int c, void (*do_fputs) (const char *, struct ui_file *),
	   void (*do_fprintf) (struct ui_file *, const char *, ...)
	   ATTRIBUTE_FPTR_PRINTF_2, struct ui_file *stream, int quoter)
{

  c &= 0xFF;			/* Avoid sign bit follies */

  if (c < 0x20 ||		/* Low control chars */
      (c >= 0x7F && c < 0xA0) ||	/* DEL, High controls */
      (sevenbit_strings && c >= 0x80))
    {				/* high order bit set */
      switch (c)
	{
	case '\n':
	  do_fputs ("\\n", stream);
	  break;
	case '\b':
	  do_fputs ("\\b", stream);
	  break;
	case '\t':
	  do_fputs ("\\t", stream);
	  break;
	case '\f':
	  do_fputs ("\\f", stream);
	  break;
	case '\r':
	  do_fputs ("\\r", stream);
	  break;
	case '\033':
	  do_fputs ("\\e", stream);
	  break;
	case '\007':
	  do_fputs ("\\a", stream);
	  break;
	default:
	  do_fprintf (stream, "\\%.3o", (unsigned int) c);
	  break;
	}
    }
  else
    {
      if (c == '\\' || c == quoter)
	do_fputs ("\\", stream);
      do_fprintf (stream, "%c", c);
    }
}

/* Print the character C on STREAM as part of the contents of a
   literal string whose delimiter is QUOTER.  Note that these routines
   should only be call for printing things which are independent of
   the language of the program being debugged. */

void
fputstr_filtered (const char *str, int quoter, struct ui_file *stream)
{
  while (*str)
    printchar (*str++, fputs_filtered, fprintf_filtered, stream, quoter);
}

void
fputstr_unfiltered (const char *str, int quoter, struct ui_file *stream)
{
  while (*str)
    printchar (*str++, fputs_unfiltered, fprintf_unfiltered, stream, quoter);
}

void
fputstrn_unfiltered (const char *str, int n, int quoter,
		     struct ui_file *stream)
{
  int i;
  for (i = 0; i < n; i++)
    printchar (str[i], fputs_unfiltered, fprintf_unfiltered, stream, quoter);
}


/* Number of lines per page or UINT_MAX if paging is disabled.  */
static unsigned int lines_per_page;
static void
show_lines_per_page (struct ui_file *file, int from_tty,
		     struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("\
Number of lines gdb thinks are in a page is %s.\n"),
		    value);
}

/* Number of chars per line or UINT_MAX if line folding is disabled.  */
static unsigned int chars_per_line;
static void
show_chars_per_line (struct ui_file *file, int from_tty,
		     struct cmd_list_element *c, const char *value)
{
  fprintf_filtered (file, _("\
Number of characters gdb thinks are in a line is %s.\n"),
		    value);
}

/* Current count of lines printed on this page, chars on this line.  */
static unsigned int lines_printed, chars_printed;

/* Buffer and start column of buffered text, for doing smarter word-
   wrapping.  When someone calls wrap_here(), we start buffering output
   that comes through fputs_filtered().  If we see a newline, we just
   spit it out and forget about the wrap_here().  If we see another
   wrap_here(), we spit it out and remember the newer one.  If we see
   the end of the line, we spit out a newline, the indent, and then
   the buffered output.  */

/* Malloc'd buffer with chars_per_line+2 bytes.  Contains characters which
   are waiting to be output (they have already been counted in chars_printed).
   When wrap_buffer[0] is null, the buffer is empty.  */
static char *wrap_buffer;

/* Pointer in wrap_buffer to the next character to fill.  */
static char *wrap_pointer;

/* String to indent by if the wrap occurs.  Must not be NULL if wrap_column
   is non-zero.  */
static char *wrap_indent;

/* Column number on the screen where wrap_buffer begins, or 0 if wrapping
   is not in effect.  */
static int wrap_column;


/* Inialize the number of lines per page and chars per line.  */

void
init_page_info (void)
{
#if defined(TUI)
  if (!tui_get_command_dimension (&chars_per_line, &lines_per_page))
#endif
    {
      int rows, cols;

#if defined(__GO32__)
      rows = ScreenRows ();
      cols = ScreenCols ();
      lines_per_page = rows;
      chars_per_line = cols;
#else
      /* Make sure Readline has initialized its terminal settings.  */
      rl_reset_terminal (NULL);

      /* Get the screen size from Readline.  */
      rl_get_screen_size (&rows, &cols);
      lines_per_page = rows;
      chars_per_line = cols;

      /* Readline should have fetched the termcap entry for us.  */
      if (tgetnum ("li") < 0 || getenv ("EMACS"))
        {
          /* The number of lines per page is not mentioned in the
             terminal description.  This probably means that paging is
             not useful (e.g. emacs shell window), so disable paging.  */
          lines_per_page = UINT_MAX;
        }
      
      /* FIXME: Get rid of this junk.  */
#if defined(SIGWINCH) && defined(SIGWINCH_HANDLER)
      SIGWINCH_HANDLER (SIGWINCH);
#endif
      
      /* If the output is not a terminal, don't paginate it.  */
      if (!ui_file_isatty (gdb_stdout))
        lines_per_page = UINT_MAX;
#endif
    }

  set_screen_size ();
  set_width ();
}

/* Set the screen size based on LINES_PER_PAGE and CHARS_PER_LINE.  */

/* APPLE LOCAL make globally visible */
void
set_screen_size (void)
{
  int rows = lines_per_page;
  int cols = chars_per_line;

  if (rows <= 0)
    rows = INT_MAX;

  if (cols <= 0)
    rl_get_screen_size (NULL, &cols);

  /* Update Readline's idea of the terminal size.  */
  rl_set_screen_size (rows, cols);
}

/* Reinitialize WRAP_BUFFER according to the current value of
   CHARS_PER_LINE.  */

/* APPLE LOCAL make globally visible */
void
set_width (void)
{
  if (chars_per_line == 0)
    /* APPLE LOCAL huh? */
    {
      /* can't print warning message; terminal output may not be initialized yet */
      chars_per_line = UINT_MAX;
    }

  if (!wrap_buffer)
    {
      wrap_buffer = (char *) xmalloc (chars_per_line + 2);
      wrap_buffer[0] = '\0';
    }
  else
    wrap_buffer = (char *) xrealloc (wrap_buffer, chars_per_line + 2);
  wrap_pointer = wrap_buffer;	/* Start it at the beginning.  */
}

static void
set_width_command (char *args, int from_tty, struct cmd_list_element *c)
{
  set_screen_size ();
  set_width ();
}

static void
set_height_command (char *args, int from_tty, struct cmd_list_element *c)
{
  set_screen_size ();
}

/* Wait, so the user can read what's on the screen.  Prompt the user
   to continue by pressing RETURN.  */

static void
prompt_for_continue (void)
{
  char *ignore;
  char cont_prompt[120];

  if (annotation_level > 1)
    printf_unfiltered (("\n\032\032pre-prompt-for-continue\n"));

  strcpy (cont_prompt,
	  "---Type <return> to continue, or q <return> to quit---");
  if (annotation_level > 1)
    strcat (cont_prompt, "\n\032\032prompt-for-continue\n");

  /* We must do this *before* we call gdb_readline, else it will eventually
     call us -- thinking that we're trying to print beyond the end of the 
     screen.  */
  reinitialize_more_filter ();

  immediate_quit++;
  /* On a real operating system, the user can quit with SIGINT.
     But not on GO32.

     'q' is provided on all systems so users don't have to change habits
     from system to system, and because telling them what to do in
     the prompt is more user-friendly than expecting them to think of
     SIGINT.  */
  /* Call readline, not gdb_readline, because GO32 readline handles control-C
     whereas control-C to gdb_readline will cause the user to get dumped
     out to DOS.  */
  ignore = gdb_readline_wrapper (cont_prompt);

  if (annotation_level > 1)
    printf_unfiltered (("\n\032\032post-prompt-for-continue\n"));

  if (ignore)
    {
      char *p = ignore;
      while (*p == ' ' || *p == '\t')
	++p;
      if (p[0] == 'q')
	async_request_quit (0);
      xfree (ignore);
    }
  immediate_quit--;

  /* Now we have to do this again, so that GDB will know that it doesn't
     need to save the ---Type <return>--- line at the top of the screen.  */
  reinitialize_more_filter ();

  dont_repeat ();		/* Forget prev cmd -- CR won't repeat it. */
}

/* Reinitialize filter; ie. tell it to reset to original values.  */

void
reinitialize_more_filter (void)
{
  lines_printed = 0;
  chars_printed = 0;
}

/* Indicate that if the next sequence of characters overflows the line,
   a newline should be inserted here rather than when it hits the end. 
   If INDENT is non-null, it is a string to be printed to indent the
   wrapped part on the next line.  INDENT must remain accessible until
   the next call to wrap_here() or until a newline is printed through
   fputs_filtered().

   If the line is already overfull, we immediately print a newline and
   the indentation, and disable further wrapping.

   If we don't know the width of lines, but we know the page height,
   we must not wrap words, but should still keep track of newlines
   that were explicitly printed.

   INDENT should not contain tabs, as that will mess up the char count
   on the next line.  FIXME.

   This routine is guaranteed to force out any output which has been
   squirreled away in the wrap_buffer, so wrap_here ((char *)0) can be
   used to force out output from the wrap_buffer.  */

void
wrap_here (char *indent)
{
  /* This should have been allocated, but be paranoid anyway. */
  if (!wrap_buffer)
    internal_error (__FILE__, __LINE__, _("failed internal consistency check"));

  if (wrap_buffer[0])
    {
      *wrap_pointer = '\0';
      fputs_unfiltered (wrap_buffer, gdb_stdout);
    }
  wrap_pointer = wrap_buffer;
  wrap_buffer[0] = '\0';
  if (chars_per_line == UINT_MAX)	/* No line overflow checking */
    {
      wrap_column = 0;
    }
  else if (chars_printed >= chars_per_line)
    {
      puts_filtered ("\n");
      if (indent != NULL)
	puts_filtered (indent);
      wrap_column = 0;
    }
  else
    {
      wrap_column = chars_printed;
      if (indent == NULL)
	wrap_indent = "";
      else
	wrap_indent = indent;
    }
}

/* Print input string to gdb_stdout, filtered, with wrap, 
   arranging strings in columns of n chars. String can be
   right or left justified in the column.  Never prints 
   trailing spaces.  String should never be longer than
   width.  FIXME: this could be useful for the EXAMINE 
   command, which currently doesn't tabulate very well */

void
puts_filtered_tabular (char *string, int width, int right)
{
  int spaces = 0;
  int stringlen;
  char *spacebuf;

  gdb_assert (chars_per_line > 0);
  if (chars_per_line == UINT_MAX)
    {
      fputs_filtered (string, gdb_stdout);
      fputs_filtered ("\n", gdb_stdout);
      return;
    }

  if (((chars_printed - 1) / width + 2) * width >= chars_per_line)
    fputs_filtered ("\n", gdb_stdout);

  if (width >= chars_per_line)
    width = chars_per_line - 1;

  stringlen = strlen (string);

  if (chars_printed > 0)
    spaces = width - (chars_printed - 1) % width - 1;
  if (right)
    spaces += width - stringlen;

  spacebuf = alloca (spaces + 1);
  spacebuf[spaces] = '\0';
  while (spaces--)
    spacebuf[spaces] = ' ';

  fputs_filtered (spacebuf, gdb_stdout);
  fputs_filtered (string, gdb_stdout);
}


/* Ensure that whatever gets printed next, using the filtered output
   commands, starts at the beginning of the line.  I.E. if there is
   any pending output for the current line, flush it and start a new
   line.  Otherwise do nothing. */

void
begin_line (void)
{
  if (chars_printed > 0)
    {
      puts_filtered ("\n");
    }
}


/* Like fputs but if FILTER is true, pause after every screenful.

   Regardless of FILTER can wrap at points other than the final
   character of a line.

   Unlike fputs, fputs_maybe_filtered does not return a value.
   It is OK for LINEBUFFER to be NULL, in which case just don't print
   anything.

   Note that a longjmp to top level may occur in this routine (only if
   FILTER is true) (since prompt_for_continue may do so) so this
   routine should not be called when cleanups are not in place.  */

static void
fputs_maybe_filtered (const char *linebuffer, struct ui_file *stream,
		      int filter)
{
  const char *lineptr;

  /* APPLE LOCAL */
  gdb_assert (chars_per_line > 0);
  if (linebuffer == 0)
    return;

  /* Don't do any filtering if it is disabled.  */
  if ((stream != gdb_stdout) || !pagination_enabled
      || (lines_per_page == UINT_MAX && chars_per_line == UINT_MAX))
    {
      fputs_unfiltered (linebuffer, stream);
      return;
    }

  /* Go through and output each character.  Show line extension
     when this is necessary; prompt user for new page when this is
     necessary.  */

  lineptr = linebuffer;
  while (*lineptr)
    {
      /* Possible new page.  */
      if (filter && (lines_printed >= lines_per_page - 1))
	prompt_for_continue ();

      while (*lineptr && *lineptr != '\n')
	{
	  /* Print a single line.  */
	  if (*lineptr == '\t')
	    {
	      if (wrap_column)
		*wrap_pointer++ = '\t';
	      else
		fputc_unfiltered ('\t', stream);
	      /* Shifting right by 3 produces the number of tab stops
	         we have already passed, and then adding one and
	         shifting left 3 advances to the next tab stop.  */
	      chars_printed = ((chars_printed >> 3) + 1) << 3;
	      lineptr++;
	    }
	  else
	    {
	      if (wrap_column)
		*wrap_pointer++ = *lineptr;
	      else
		fputc_unfiltered (*lineptr, stream);
	      chars_printed++;
	      lineptr++;
	    }

	  if (chars_printed >= chars_per_line)
	    {
	      unsigned int save_chars = chars_printed;

	      chars_printed = 0;
	      lines_printed++;
	      /* If we aren't actually wrapping, don't output newline --
	         if chars_per_line is right, we probably just overflowed
	         anyway; if it's wrong, let us keep going.  */
	      if (wrap_column)
		fputc_unfiltered ('\n', stream);

	      /* Possible new page.  */
	      if (lines_printed >= lines_per_page - 1)
		prompt_for_continue ();

	      /* Now output indentation and wrapped string */
	      if (wrap_column)
		{
		  fputs_unfiltered (wrap_indent, stream);
		  *wrap_pointer = '\0';	/* Null-terminate saved stuff */
		  fputs_unfiltered (wrap_buffer, stream);	/* and eject it */
		  /* FIXME, this strlen is what prevents wrap_indent from
		     containing tabs.  However, if we recurse to print it
		     and count its chars, we risk trouble if wrap_indent is
		     longer than (the user settable) chars_per_line. 
		     Note also that this can set chars_printed > chars_per_line
		     if we are printing a long string.  */
		  chars_printed = strlen (wrap_indent)
		    + (save_chars - wrap_column);
		  wrap_pointer = wrap_buffer;	/* Reset buffer */
		  wrap_buffer[0] = '\0';
		  wrap_column = 0;	/* And disable fancy wrap */
		}
	    }
	}

      if (*lineptr == '\n')
	{
	  chars_printed = 0;
	  wrap_here ((char *) 0);	/* Spit out chars, cancel further wraps */
	  lines_printed++;
	  fputc_unfiltered ('\n', stream);
	  lineptr++;
	}
    }
}

void
fputs_filtered (const char *linebuffer, struct ui_file *stream)
{
  fputs_maybe_filtered (linebuffer, stream, 1);
}

int
putchar_unfiltered (int c)
{
  char buf = c;
  ui_file_write (gdb_stdout, &buf, 1);
  return c;
}

/* Write character C to gdb_stdout using GDB's paging mechanism and return C.
   May return nonlocally.  */

int
putchar_filtered (int c)
{
  return fputc_filtered (c, gdb_stdout);
}

int
fputc_unfiltered (int c, struct ui_file *stream)
{
  char buf = c;
  ui_file_write (stream, &buf, 1);
  return c;
}

int
fputc_filtered (int c, struct ui_file *stream)
{
  char buf[2];

  buf[0] = c;
  buf[1] = 0;
  fputs_filtered (buf, stream);
  return c;
}

/* puts_debug is like fputs_unfiltered, except it prints special
   characters in printable fashion.  */

void
puts_debug (char *prefix, char *string, char *suffix)
{
  int ch;

  /* Print prefix and suffix after each line.  */
  static int new_line = 1;
  static int return_p = 0;
  static char *prev_prefix = "";
  static char *prev_suffix = "";

  if (*string == '\n')
    return_p = 0;

  /* If the prefix is changing, print the previous suffix, a new line,
     and the new prefix.  */
  if ((return_p || (strcmp (prev_prefix, prefix) != 0)) && !new_line)
    {
      fputs_unfiltered (prev_suffix, gdb_stdlog);
      fputs_unfiltered ("\n", gdb_stdlog);
      fputs_unfiltered (prefix, gdb_stdlog);
    }

  /* Print prefix if we printed a newline during the previous call.  */
  if (new_line)
    {
      new_line = 0;
      fputs_unfiltered (prefix, gdb_stdlog);
    }

  prev_prefix = prefix;
  prev_suffix = suffix;

  /* Output characters in a printable format.  */
  while ((ch = *string++) != '\0')
    {
      switch (ch)
	{
	default:
	  if (isprint (ch))
	    fputc_unfiltered (ch, gdb_stdlog);

	  else
	    fprintf_unfiltered (gdb_stdlog, "\\x%02x", ch & 0xff);
	  break;

	case '\\':
	  fputs_unfiltered ("\\\\", gdb_stdlog);
	  break;
	case '\b':
	  fputs_unfiltered ("\\b", gdb_stdlog);
	  break;
	case '\f':
	  fputs_unfiltered ("\\f", gdb_stdlog);
	  break;
	case '\n':
	  new_line = 1;
	  fputs_unfiltered ("\\n", gdb_stdlog);
	  break;
	case '\r':
	  fputs_unfiltered ("\\r", gdb_stdlog);
	  break;
	case '\t':
	  fputs_unfiltered ("\\t", gdb_stdlog);
	  break;
	case '\v':
	  fputs_unfiltered ("\\v", gdb_stdlog);
	  break;
	}

      return_p = ch == '\r';
    }

  /* Print suffix if we printed a newline.  */
  if (new_line)
    {
      fputs_unfiltered (suffix, gdb_stdlog);
      fputs_unfiltered ("\n", gdb_stdlog);
    }
}


/* Print a variable number of ARGS using format FORMAT.  If this
   information is going to put the amount written (since the last call
   to REINITIALIZE_MORE_FILTER or the last page break) over the page size,
   call prompt_for_continue to get the users permision to continue.

   Unlike fprintf, this function does not return a value.

   We implement three variants, vfprintf (takes a vararg list and stream),
   fprintf (takes a stream to write on), and printf (the usual).

   Note also that a longjmp to top level may occur in this routine
   (since prompt_for_continue may do so) so this routine should not be
   called when cleanups are not in place.  */

static void
vfprintf_maybe_filtered (struct ui_file *stream, const char *format,
			 va_list args, int filter)
{
  char *linebuffer;
  struct cleanup *old_cleanups;

  linebuffer = xstrvprintf (format, args);
  old_cleanups = make_cleanup (xfree, linebuffer);
  fputs_maybe_filtered (linebuffer, stream, filter);
  do_cleanups (old_cleanups);
}


void
vfprintf_filtered (struct ui_file *stream, const char *format, va_list args)
{
  vfprintf_maybe_filtered (stream, format, args, 1);
}

void
vfprintf_unfiltered (struct ui_file *stream, const char *format, va_list args)
{
  char *linebuffer;
  struct cleanup *old_cleanups;

  linebuffer = xstrvprintf (format, args);
  old_cleanups = make_cleanup (xfree, linebuffer);
  fputs_unfiltered (linebuffer, stream);
  do_cleanups (old_cleanups);
}

void
vprintf_filtered (const char *format, va_list args)
{
  vfprintf_maybe_filtered (gdb_stdout, format, args, 1);
}

void
vprintf_unfiltered (const char *format, va_list args)
{
  vfprintf_unfiltered (gdb_stdout, format, args);
}

void
fprintf_filtered (struct ui_file *stream, const char *format, ...)
{
  va_list args;
  va_start (args, format);
  vfprintf_filtered (stream, format, args);
  va_end (args);
}

void
fprintf_unfiltered (struct ui_file *stream, const char *format, ...)
{
  va_list args;
  va_start (args, format);
  vfprintf_unfiltered (stream, format, args);
  va_end (args);
}

/* Like fprintf_filtered, but prints its result indented.
   Called as fprintfi_filtered (spaces, stream, format, ...);  */

void
fprintfi_filtered (int spaces, struct ui_file *stream, const char *format,
		   ...)
{
  va_list args;
  va_start (args, format);
  print_spaces_filtered (spaces, stream);

  vfprintf_filtered (stream, format, args);
  va_end (args);
}


void
printf_filtered (const char *format, ...)
{
  va_list args;
  va_start (args, format);
  vfprintf_filtered (gdb_stdout, format, args);
  va_end (args);
}


void
printf_unfiltered (const char *format, ...)
{
  va_list args;
  va_start (args, format);
  vfprintf_unfiltered (gdb_stdout, format, args);
  va_end (args);
}

/* Like printf_filtered, but prints it's result indented.
   Called as printfi_filtered (spaces, format, ...);  */

void
printfi_filtered (int spaces, const char *format, ...)
{
  va_list args;
  va_start (args, format);
  print_spaces_filtered (spaces, gdb_stdout);
  vfprintf_filtered (gdb_stdout, format, args);
  va_end (args);
}

/* Easy -- but watch out!

   This routine is *not* a replacement for puts()!  puts() appends a newline.
   This one doesn't, and had better not!  */

void
puts_filtered (const char *string)
{
  fputs_filtered (string, gdb_stdout);
}

void
puts_unfiltered (const char *string)
{
  fputs_unfiltered (string, gdb_stdout);
}

/* Return a pointer to N spaces and a null.  The pointer is good
   until the next call to here.  */
char *
n_spaces (int n)
{
  char *t;
  static char *spaces = 0;
  static int max_spaces = -1;

  if (n > max_spaces)
    {
      if (spaces)
	xfree (spaces);
      spaces = (char *) xmalloc (n + 1);
      for (t = spaces + n; t != spaces;)
	*--t = ' ';
      spaces[n] = '\0';
      max_spaces = n;
    }

  return spaces + max_spaces - n;
}

/* Print N spaces.  */
void
print_spaces_filtered (int n, struct ui_file *stream)
{
  fputs_filtered (n_spaces (n), stream);
}

/* C++/ObjC demangler stuff.  */

/* fprintf_symbol_filtered attempts to demangle NAME, a symbol in language
   LANG, using demangling args ARG_MODE, and print it filtered to STREAM.
   If the name is not mangled, or the language for the name is unknown, or
   demangling is off, the name is printed in its "raw" form. */

void
fprintf_symbol_filtered (struct ui_file *stream, char *name,
			 enum language lang, int arg_mode)
{
  char *demangled;

  if (name != NULL)
    {
      /* If user wants to see raw output, no problem.  */
      if (!demangle)
	{
	  fputs_filtered (name, stream);
	}
      else
	{
	  demangled = language_demangle (language_def (lang), name, arg_mode);
	  fputs_filtered (demangled ? demangled : name, stream);
	  if (demangled != NULL)
	    {
	      xfree (demangled);
	    }
	}
    }
}

/* Do a strcmp() type operation on STRING1 and STRING2, ignoring any
   differences in whitespace.  Returns 0 if they match, non-zero if they
   don't (slightly different than strcmp()'s range of return values).

   As an extra hack, string1=="FOO(ARGS)" matches string2=="FOO".
   This "feature" is useful when searching for matching C++ function names
   (such as if the user types 'break FOO', where FOO is a mangled C++
   function). */

int
strcmp_iw (const char *string1, const char *string2)
{
  while ((*string1 != '\0') && (*string2 != '\0'))
    {
      while (isspace (*string1))
	{
	  string1++;
	}
      while (isspace (*string2))
	{
	  string2++;
	}
      if (*string1 != *string2)
	{
	  break;
	}
      if (*string1 != '\0')
	{
	  string1++;
	  string2++;
	}
    }
  return (*string1 != '\0' && *string1 != '(') || (*string2 != '\0');
}

/* This is like strcmp except that it ignores whitespace and treats
   '(' as the first non-NULL character in terms of ordering.  Like
   strcmp (and unlike strcmp_iw), it returns negative if STRING1 <
   STRING2, 0 if STRING2 = STRING2, and positive if STRING1 > STRING2
   according to that ordering.

   If a list is sorted according to this function and if you want to
   find names in the list that match some fixed NAME according to
   strcmp_iw(LIST_ELT, NAME), then the place to start looking is right
   where this function would put NAME.

   Here are some examples of why using strcmp to sort is a bad idea:

   Whitespace example:

   Say your partial symtab contains: "foo<char *>", "goo".  Then, if
   we try to do a search for "foo<char*>", strcmp will locate this
   after "foo<char *>" and before "goo".  Then lookup_partial_symbol
   will start looking at strings beginning with "goo", and will never
   see the correct match of "foo<char *>".

   Parenthesis example:

   In practice, this is less like to be an issue, but I'll give it a
   shot.  Let's assume that '$' is a legitimate character to occur in
   symbols.  (Which may well even be the case on some systems.)  Then
   say that the partial symbol table contains "foo$" and "foo(int)".
   strcmp will put them in this order, since '$' < '('.  Now, if the
   user searches for "foo", then strcmp will sort "foo" before "foo$".
   Then lookup_partial_symbol will notice that strcmp_iw("foo$",
   "foo") is false, so it won't proceed to the actual match of
   "foo(int)" with "foo".  */

int
strcmp_iw_ordered (const char *string1, const char *string2)
{
  while ((*string1 != '\0') && (*string2 != '\0'))
    {
      while (isspace (*string1))
	{
	  string1++;
	}
      while (isspace (*string2))
	{
	  string2++;
	}
      if (*string1 != *string2)
	{
	  break;
	}
      if (*string1 != '\0')
	{
	  string1++;
	  string2++;
	}
    }

  switch (*string1)
    {
      /* Characters are non-equal unless they're both '\0'; we want to
	 make sure we get the comparison right according to our
	 comparison in the cases where one of them is '\0' or '('.  */
    case '\0':
      if (*string2 == '\0')
	return 0;
      else
	return -1;
    case '(':
      if (*string2 == '\0')
	return 1;
      else
	return -1;
    default:
      if (*string2 == '(')
	return 1;
      else
	return *string1 - *string2;
    }
}

/* A simple comparison function with opposite semantics to strcmp.  */

int
streq (const char *lhs, const char *rhs)
{
  return !strcmp (lhs, rhs);
}


/*
   ** subset_compare()
   **    Answer whether string_to_compare is a full or partial match to
   **    template_string.  The partial match must be in sequence starting
   **    at index 0.
 */
int
subset_compare (char *string_to_compare, char *template_string)
{
  int match;
  if (template_string != (char *) NULL && string_to_compare != (char *) NULL
      && strlen (string_to_compare) <= strlen (template_string))
    match =
      (strncmp
       (template_string, string_to_compare, strlen (string_to_compare)) == 0);
  else
    match = 0;
  return match;
}


static void pagination_on_command (char *arg, int from_tty);
static void
pagination_on_command (char *arg, int from_tty)
{
  pagination_enabled = 1;
}

static void pagination_on_command (char *arg, int from_tty);
static void
pagination_off_command (char *arg, int from_tty)
{
  pagination_enabled = 0;
}


void
initialize_utils (void)
{
  add_setshow_uinteger_cmd ("width", class_support, &chars_per_line, _("\
Set number of characters gdb thinks are in a line."), _("\
Show number of characters gdb thinks are in a line."), NULL,
			    set_width_command,
			    show_chars_per_line,
			    &setlist, &showlist);

  add_setshow_uinteger_cmd ("height", class_support, &lines_per_page, _("\
Set number of lines gdb thinks are in a page."), _("\
Show number of lines gdb thinks are in a page."), NULL,
			    set_height_command,
			    show_lines_per_page,
			    &setlist, &showlist);

  init_page_info ();

  add_setshow_boolean_cmd ("demangle", class_support, &demangle, _("\
Set demangling of encoded C++/ObjC names when displaying symbols."), _("\
Show demangling of encoded C++/ObjC names when displaying symbols."), NULL,
			   NULL,
			   show_demangle,
			   &setprintlist, &showprintlist);

  add_setshow_boolean_cmd ("pagination", class_support,
			   &pagination_enabled, _("\
Set state of pagination."), _("\
Show state of pagination."), NULL,
			   NULL,
			   show_pagination_enabled,
			   &setlist, &showlist);

  if (xdb_commands)
    {
      add_com ("am", class_support, pagination_on_command,
	       _("Enable pagination"));
      add_com ("sm", class_support, pagination_off_command,
	       _("Disable pagination"));
    }

  add_setshow_boolean_cmd ("sevenbit-strings", class_support,
			   &sevenbit_strings, _("\
Set printing of 8-bit characters in strings as \\nnn."), _("\
Show printing of 8-bit characters in strings as \\nnn."), NULL,
			   NULL,
			   show_sevenbit_strings,
			   &setprintlist, &showprintlist);

  add_setshow_boolean_cmd ("asm-demangle", class_support, &asm_demangle, _("\
Set demangling of C++/ObjC names in disassembly listings."), _("\
Show demangling of C++/ObjC names in disassembly listings."), NULL,
			   NULL,
			   show_asm_demangle,
			   &setprintlist, &showprintlist);
}

/* Machine specific function to handle SIGWINCH signal. */

#ifdef  SIGWINCH_HANDLER_BODY
SIGWINCH_HANDLER_BODY
#endif
/* print routines to handle variable size regs, etc. */
/* temporary storage using circular buffer */
#define NUMCELLS 16
#define CELLSIZE 50
static char *
get_cell (void)
{
  static char buf[NUMCELLS][CELLSIZE];
  static int cell = 0;
  if (++cell >= NUMCELLS)
    cell = 0;
  return buf[cell];
}

int
strlen_paddr (void)
{
  return (TARGET_ADDR_BIT / 8 * 2);
}

char *
paddr (CORE_ADDR addr)
{
  return phex (addr, TARGET_ADDR_BIT / 8);
}

char *
paddr_nz (CORE_ADDR addr)
{
  return phex_nz (addr, TARGET_ADDR_BIT / 8);
}

const char *
paddress (CORE_ADDR addr)
{
  /* Truncate address to the size of a target address, avoiding shifts
     larger or equal than the width of a CORE_ADDR.  The local
     variable ADDR_BIT stops the compiler reporting a shift overflow
     when it won't occur. */
  /* NOTE: This assumes that the significant address information is
     kept in the least significant bits of ADDR - the upper bits were
     either zero or sign extended.  Should ADDRESS_TO_POINTER() or
     some ADDRESS_TO_PRINTABLE() be used to do the conversion?  */

  int addr_bit = TARGET_ADDR_BIT;

  if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT))
    addr &= ((CORE_ADDR) 1 << addr_bit) - 1;
  return hex_string (addr);
}

static char *
decimal2str (char *sign, ULONGEST addr, int width)
{
  /* Steal code from valprint.c:print_decimal().  Should this worry
     about the real size of addr as the above does? */
  unsigned long temp[3];
  char *str = get_cell ();

  int i = 0;
  do
    {
      temp[i] = addr % (1000 * 1000 * 1000);
      addr /= (1000 * 1000 * 1000);
      i++;
      width -= 9;
    }
  while (addr != 0 && i < (sizeof (temp) / sizeof (temp[0])));

  width += 9;
  if (width < 0)
    width = 0;

  switch (i)
    {
    case 1:
      xsnprintf (str, CELLSIZE, "%s%0*lu", sign, width, temp[0]);
      break;
    case 2:
      xsnprintf (str, CELLSIZE, "%s%0*lu%09lu", sign, width,
		 temp[1], temp[0]);
      break;
    case 3:
      xsnprintf (str, CELLSIZE, "%s%0*lu%09lu%09lu", sign, width,
		 temp[2], temp[1], temp[0]);
      break;
    default:
      internal_error (__FILE__, __LINE__,
		      _("failed internal consistency check"));
    }

  return str;
}

static char *
octal2str (ULONGEST addr, int width)
{
  unsigned long temp[3];
  char *str = get_cell ();

  int i = 0;
  do
    {
      temp[i] = addr % (0100000 * 0100000);
      addr /= (0100000 * 0100000);
      i++;
      width -= 10;
    }
  while (addr != 0 && i < (sizeof (temp) / sizeof (temp[0])));

  width += 10;
  if (width < 0)
    width = 0;

  switch (i)
    {
    case 1:
      if (temp[0] == 0)
	xsnprintf (str, CELLSIZE, "%*o", width, 0);
      else
	xsnprintf (str, CELLSIZE, "0%0*lo", width, temp[0]);
      break;
    case 2:
      xsnprintf (str, CELLSIZE, "0%0*lo%010lo", width, temp[1], temp[0]);
      break;
    case 3:
      xsnprintf (str, CELLSIZE, "0%0*lo%010lo%010lo", width,
		 temp[2], temp[1], temp[0]);
      break;
    default:
      internal_error (__FILE__, __LINE__,
		      _("failed internal consistency check"));
    }

  return str;
}

char *
paddr_u (CORE_ADDR addr)
{
  return decimal2str ("", addr, 0);
}

char *
paddr_d (LONGEST addr)
{
  if (addr < 0)
    return decimal2str ("-", -addr, 0);
  else
    return decimal2str ("", addr, 0);
}

/* Eliminate warning from compiler on 32-bit systems.  */
static int thirty_two = 32;

char *
phex (ULONGEST l, int sizeof_l)
{
  char *str;

  switch (sizeof_l)
    {
    case 8:
      str = get_cell ();
      xsnprintf (str, CELLSIZE, "%08lx%08lx",
		 (unsigned long) (l >> thirty_two),
		 (unsigned long) (l & 0xffffffff));
      break;
    case 4:
      str = get_cell ();
      xsnprintf (str, CELLSIZE, "%08lx", (unsigned long) l);
      break;
    case 2:
      str = get_cell ();
      xsnprintf (str, CELLSIZE, "%04x", (unsigned short) (l & 0xffff));
      break;
    default:
      str = phex (l, sizeof (l));
      break;
    }

  return str;
}

char *
phex_nz (ULONGEST l, int sizeof_l)
{
  char *str;

  switch (sizeof_l)
    {
    case 8:
      {
	unsigned long high = (unsigned long) (l >> thirty_two);
	str = get_cell ();
	if (high == 0)
	  xsnprintf (str, CELLSIZE, "%lx",
		     (unsigned long) (l & 0xffffffff));
	else
	  xsnprintf (str, CELLSIZE, "%lx%08lx", high,
		     (unsigned long) (l & 0xffffffff));
	break;
      }
    case 4:
      str = get_cell ();
      xsnprintf (str, CELLSIZE, "%lx", (unsigned long) l);
      break;
    case 2:
      str = get_cell ();
      xsnprintf (str, CELLSIZE, "%x", (unsigned short) (l & 0xffff));
      break;
    default:
      str = phex_nz (l, sizeof (l));
      break;
    }

  return str;
}

/* APPLE LOCAL begin CHECK macro */
void gdb_check (const char *str, const char *file, unsigned int line, const char *func)
{
  error ("assertion failure on line %u of \"%s\" in function \"%s\": %s\n",
	 line, file, func, str);
}

void gdb_check_fatal (const char *str, const char *file, unsigned int line, const char *func)
{
  internal_error (file, line, "assertion failure in function \"%s\": %s\n",
		  func, str);
}
/* APPLE LOCAL end CHECK macro */

/* Converts a LONGEST to a C-format hexadecimal literal and stores it
   in a static string.  Returns a pointer to this string.  */
char *
hex_string (LONGEST num)
{
  char *result = get_cell ();
  xsnprintf (result, CELLSIZE, "0x%s", phex_nz (num, sizeof (num)));
  return result;
}

/* Converts a LONGEST number to a C-format hexadecimal literal and
   stores it in a static string.  Returns a pointer to this string
   that is valid until the next call.  The number is padded on the
   left with 0s to at least WIDTH characters.  */
char *
hex_string_custom (LONGEST num, int width)
{
  char *result = get_cell ();
  char *result_end = result + CELLSIZE - 1;
  const char *hex = phex_nz (num, sizeof (num));
  int hex_len = strlen (hex);

  if (hex_len > width)
    width = hex_len;
  if (width + 2 >= CELLSIZE)
    internal_error (__FILE__, __LINE__,
		    _("hex_string_custom: insufficient space to store result"));

  strcpy (result_end - width - 2, "0x");
  memset (result_end - width, '0', width);
  strcpy (result_end - hex_len, hex);
  return result_end - width - 2;
}

/* Convert VAL to a numeral in the given radix.  For
 * radix 10, IS_SIGNED may be true, indicating a signed quantity;
 * otherwise VAL is interpreted as unsigned.  If WIDTH is supplied, 
 * it is the minimum width (0-padded if needed).  USE_C_FORMAT means
 * to use C format in all cases.  If it is false, then 'x' 
 * and 'o' formats do not include a prefix (0x or leading 0). */

char *
int_string (LONGEST val, int radix, int is_signed, int width, 
	    int use_c_format)
{
  switch (radix) 
    {
    case 16:
      {
	char *result;
	if (width == 0)
	  result = hex_string (val);
	else
	  result = hex_string_custom (val, width);
	if (! use_c_format)
	  result += 2;
	return result;
      }
    case 10:
      {
	if (is_signed && val < 0)
	  return decimal2str ("-", -val, width);
	else
	  return decimal2str ("", val, width);
      }
    case 8:
      {
	char *result = octal2str (val, width);
	if (use_c_format || val == 0)
	  return result;
	else
	  return result + 1;
      }
    default:
      internal_error (__FILE__, __LINE__,
		      _("failed internal consistency check"));
    }
}	

/* Convert a CORE_ADDR into a string.  */
const char *
core_addr_to_string (const CORE_ADDR addr)
{
  char *str = get_cell ();
  strcpy (str, "0x");
  strcat (str, phex (addr, sizeof (addr)));
  return str;
}

const char *
core_addr_to_string_nz (const CORE_ADDR addr)
{
  char *str = get_cell ();
  strcpy (str, "0x");
  strcat (str, phex_nz (addr, sizeof (addr)));
  return str;
}

/* Convert a string back into a CORE_ADDR.  */
CORE_ADDR
string_to_core_addr (const char *my_string)
{
  CORE_ADDR addr = 0;
  if (my_string[0] == '0' && tolower (my_string[1]) == 'x')
    {
      /* Assume that it is in decimal.  */
      int i;
      for (i = 2; my_string[i] != '\0'; i++)
	{
	  if (isdigit (my_string[i]))
	    addr = (my_string[i] - '0') + (addr * 16);
	  else if (isxdigit (my_string[i]))
	    addr = (tolower (my_string[i]) - 'a' + 0xa) + (addr * 16);
	  else
	    internal_error (__FILE__, __LINE__, _("invalid hex"));
	}
    }
  else
    {
      /* Assume that it is in decimal.  */
      int i;
      for (i = 0; my_string[i] != '\0'; i++)
	{
	  if (isdigit (my_string[i]))
	    addr = (my_string[i] - '0') + (addr * 10);
	  else
	    internal_error (__FILE__, __LINE__, _("invalid decimal"));
	}
    }
  return addr;
}

char *
gdb_realpath (const char *filename)
{
  /* Method 1: The system has a compile time upper bound on a filename
     path.  Use that and realpath() to canonicalize the name.  This is
     the most common case.  Note that, if there isn't a compile time
     upper bound, you want to avoid realpath() at all costs.  */
#if defined(HAVE_REALPATH)
  {
# if defined (PATH_MAX)
    char buf[PATH_MAX];
#  define USE_REALPATH
# elif defined (MAXPATHLEN)
    char buf[MAXPATHLEN];
#  define USE_REALPATH
# endif
# if defined (USE_REALPATH)
    const char *rp = realpath (filename, buf);
    if (rp == NULL)
      rp = filename;
    return xstrdup (rp);
# endif
  }
#endif /* HAVE_REALPATH */

  /* Method 2: The host system (i.e., GNU) has the function
     canonicalize_file_name() which malloc's a chunk of memory and
     returns that, use that.  */
#if defined(HAVE_CANONICALIZE_FILE_NAME)
  {
    char *rp = canonicalize_file_name (filename);
    if (rp == NULL)
      return xstrdup (filename);
    else
      return rp;
  }
#endif

  /* FIXME: cagney/2002-11-13:

     Method 2a: Use realpath() with a NULL buffer.  Some systems, due
     to the problems described in in method 3, have modified their
     realpath() implementation so that it will allocate a buffer when
     NULL is passed in.  Before this can be used, though, some sort of
     configure time test would need to be added.  Otherwize the code
     will likely core dump.  */

  /* Method 3: Now we're getting desperate!  The system doesn't have a
     compile time buffer size and no alternative function.  Query the
     OS, using pathconf(), for the buffer limit.  Care is needed
     though, some systems do not limit PATH_MAX (return -1 for
     pathconf()) making it impossible to pass a correctly sized buffer
     to realpath() (it could always overflow).  On those systems, we
     skip this.  */
#if defined (HAVE_REALPATH) && defined (HAVE_UNISTD_H) && defined(HAVE_ALLOCA)
  {
    /* Find out the max path size.  */
    long path_max = pathconf ("/", _PC_PATH_MAX);
    if (path_max > 0)
      {
	/* PATH_MAX is bounded.  */
	char *buf = alloca (path_max);
	char *rp = realpath (filename, buf);
	return xstrdup (rp ? rp : filename);
      }
  }
#endif

  /* This system is a lost cause, just dup the buffer.  */
  return xstrdup (filename);
}

/* Return a copy of FILENAME, with its directory prefix canonicalized
   by gdb_realpath.  */

char *
xfullpath (const char *filename)
{
  const char *base_name = lbasename (filename);
  char *dir_name;
  char *real_path;
  char *result;

  /* Extract the basename of filename, and return immediately 
     a copy of filename if it does not contain any directory prefix. */
  if (base_name == filename)
    return xstrdup (filename);

  dir_name = alloca ((size_t) (base_name - filename + 2));
  /* Allocate enough space to store the dir_name + plus one extra
     character sometimes needed under Windows (see below), and
     then the closing \000 character */
  strncpy (dir_name, filename, base_name - filename);
  dir_name[base_name - filename] = '\000';

#ifdef HAVE_DOS_BASED_FILE_SYSTEM
  /* We need to be careful when filename is of the form 'd:foo', which
     is equivalent of d:./foo, which is totally different from d:/foo.  */
  if (strlen (dir_name) == 2 && isalpha (dir_name[0]) && dir_name[1] == ':')
    {
      dir_name[2] = '.';
      dir_name[3] = '\000';
    }
#endif

  /* Canonicalize the directory prefix, and build the resulting
     filename. If the dirname realpath already contains an ending
     directory separator, avoid doubling it.  */
  real_path = gdb_realpath (dir_name);
  if (IS_DIR_SEPARATOR (real_path[strlen (real_path) - 1]))
    result = concat (real_path, base_name, (char *)NULL);
  else
    result = concat (real_path, SLASH_STRING, base_name, (char *)NULL);

  xfree (real_path);
  return result;
}


/* This is the 32-bit CRC function used by the GNU separate debug
   facility.  An executable may contain a section named
   .gnu_debuglink, which holds the name of a separate executable file
   containing its debug info, and a checksum of that file's contents,
   computed using this function.  */
unsigned long
gnu_debuglink_crc32 (unsigned long crc, unsigned char *buf, size_t len)
{
  static const unsigned long crc32_table[256] = {
    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
    0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
    0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
    0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
    0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
    0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
    0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
    0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
    0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
    0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
    0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
    0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
    0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
    0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
    0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
    0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
    0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
    0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
    0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
    0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
    0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
    0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
    0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
    0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
    0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
    0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
    0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
    0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
    0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
    0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
    0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
    0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
    0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
    0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
    0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
    0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
    0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
    0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
    0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
    0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
    0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
    0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
    0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
    0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
    0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
    0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
    0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
    0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
    0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
    0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
    0x2d02ef8d
  };
  unsigned char *end;

  crc = ~crc & 0xffffffff;
  for (end = buf + len; buf < end; ++buf)
    crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
  return ~crc & 0xffffffff;;
}

ULONGEST
align_up (ULONGEST v, int n)
{
  /* Check that N is really a power of two.  */
  gdb_assert (n && (n & (n-1)) == 0);
  return (v + n - 1) & -n;
}

ULONGEST
align_down (ULONGEST v, int n)
{
  /* Check that N is really a power of two.  */
  gdb_assert (n && (n & (n-1)) == 0);
  return (v & -n);
}

/* Break up SCRATCH into an argument vector suitable for passing to
   execvp and store it in ARGV.  E.g., on "run a b c d" this routine
   would get as input the string "a b c d", and as output it would
   fill in ARGV with the four arguments "a", "b", "c", "d".  */

/* APPLE LOCAL: Moved this from fork-child since I need it in remote
   and fork-child doesn't get built for a cross.  I also changed this
   to report argv as well.  */
void
breakup_args (char *scratch, int *argc, char **argv)
{
  char *cp = scratch;

  *argc = 0;

  for (;;)
    {
      /* Scan past leading separators */
      while (*cp == ' ' || *cp == '\t' || *cp == '\n')
	cp++;

      /* Break if at end of string.  */
      if (*cp == '\0')
	break;

      /* Take an arg.  */
      *argv++ = cp;
      (*argc)++;

      /* Scan for next arg separator */
      while (!(*cp == '\0' || *cp == ' ' || *cp == '\t' || *cp == '\n'))
	{
	  cp++;
	}

      /* No separators => end of string => break */
      if (*cp == '\0')
	break;

      /* Replace the separator with a terminator.  */
      *cp++ = '\0';
    }

  /* Null-terminate the vector.  */
  *argv = NULL;
}


/* We may have one bundle embedded inside another; we want the innermost
   bundle name we can find.  So we need a reverse strstr() function.  Here's
   a simple way to do it; it could probably be done more efficiently. 

   Search string S to find the last occurrence of substring R.
   Returns NULL if R is not present in S.  */

static const char *
strrstr (const char *s, const char *r)
{
  int s_len = strlen (s);
  int r_len = strlen (r);
  const char *i, *j;
  i = strstr (s, r);
  j = i;
  while (i != NULL)
    {
      j = i;
      if (i + r_len < s + s_len)
        i = strstr (i + 1, r);
      else
        break;
    }
  return j;
}

/* Search a string between BEG and END for character C, scanning backwards
   from END to BEG.  
   Returns a pointer to the matched character, or NULL if not present in the
   string.  */

static const char *
strrchr_bounded (const char *beg, const char *end, char c)
{
  const char *i = end;
  if (end <= beg)
    return NULL;

  while (i > beg && *i != c)
    i--;
  if (*i != c)
    return NULL;
  return i;
}

/* This version is like basename(3) but instead of returning a pointer to the
   final component of the filename, it returns a pointer to the name of a 
   bundle in FILEPATH, if any.  There may be bundles nested inside frameworks
   nested inside app bundles -- a pointer to the innermost (i.e. last) bundle 
   name will be returned.
   
   Some example test paths:

   /System/Library/PreferencePanes/Localization.prefPane/Contents/Resources/IntlKeyboard.prefPane/Contents/Resources/sv.lproj/IntlKeyboard.nib
   /Developer/Applications/Dashcode.app/Contents/Frameworks/CYKit.framework/Versions/A/Resources/Parts/FrontLozengeTextButton.part/Info.plist
   /Developer/Applications/Dashcode.app/Contents/Frameworks/CYKit.framework/Versions/A/Resources/Snippets/DnDsetup.snippet/Info.plist
   /AppleInternal/Developer/Examples/PrinterSupport/DSTROOT/Library/Printers/Vendor/InkJet/1.plugin/Contents/Info.plist
   /Developer/Applications/Dashcode.app/Contents/Frameworks/CYKit.framework/Versions/A/Resources/Parts/BottomRectangleShape.part/Info.plist
   /Developer/Applications/Dashcode.app/Contents/Frameworks/CYKit.framework/Versions/A/Resources/Parts/InputCheckbox.part/Variations/MobileWeb.part/Info.plist
   /Developer/Applications/Dashcode.app/Contents/Frameworks/CYKit.framework/Versions/A/Resources/Parts/Text.part/Variations/MobileWeb.part/Info.plist
   /Library/Printers/Xerox/PDEs/Xerox DocuColor 5252.plugin/Contents/PlugIns/WatermarkEditor.bundle/Contents/Resources/fr.lproj/WatermarkEditor.nib/objects.nib
   /System/Library/PrivateFrameworks/ScreenReader.framework/Versions/A/Resources/VoiceOver Quickstart.app/Contents/Resources/VOTraining.bundle/Contents/Resources/French.lproj/Practice.nib
   /System/Library/Speech/Recognizers/AppleSpeakableItems.SpeechRecognizer/Contents/Resources/PreferenceViewPlugin.bundle/Contents/Resources/English.lproj/ApplePreferenceViewPlugin.nib/keyedobjects.nib
   /Library/Frameworks/HPDeviceModel.framework/Versions/2.0/Frameworks/Core.framework/Versions/2.0/Resources/DMF/7B5B9995E033B681A0797A33402E62C0/FFE335C58B478842
   /Library/Frameworks/HPDeviceModel.framework/Versions/2.0/Frameworks/Core.framework/Versions/2.0/Resources/PlugIns/CFXmlParser.plugin/Contents/_CodeSignature/CodeResources
   /Library/Frameworks/HPDeviceModel.framework/Versions/2.0/Frameworks/Status.framework/Versions/2.0/Resources/PlugIns/DeviceTrays.plugin/Contents/MacOS/DeviceTrays
  /Volumes/Macintosh_HD/branch/build/Development/Versions.app/Contents/MacOS/Versions

  An example path that this function does not handle correctly today:
  /tmp/SampleApplication/BundleLoadTester/Debug/BundleLoadTester.app/Contents/Frameworks/Contents.bundle/Contents/MacOS/Contents

  NB: One bug with this function as it is currently written is that we 
  look for a string like "Contents" to indicate a typical app bundle,
  "Versions" to indicate a framework bundle, etc.  This works fine until 
  someone has Versions.app or Contents.framework with that name repeated
  down lower in the bundle.

*/

const char *
bundle_basename (const char *filepath)
{
  const char *i, *j;
  const char *bundle_name_start = NULL;
  const char *bundle_name_end = NULL;  /* points to '/' after bundle name */
  int deep_bundle = 0;
  int have_bundle = 0;

  /* A file in a bundle must have multiple file path parts.  */
  if (filepath == NULL || strchr (filepath, '/') == NULL)
    return NULL;

  /* Look for: foo.definition/Contents/Resources/whatev */

  if (bundle_name_start == NULL
      && (i = strrstr (filepath, "Contents")) != NULL
      && i > filepath + 2)
    {
      j = strrchr_bounded (filepath, i - 2, '/');
      if (j == filepath || j == NULL)
        {
          if (*filepath == '/')
            bundle_name_start = filepath + 1;
          else
            bundle_name_start = filepath;
          bundle_name_end = i - 1;
          deep_bundle = 1;
          have_bundle = 1;
        }
      else if (*j == '/')
        {
          bundle_name_start = j + 1;
          bundle_name_end = i - 1;
          deep_bundle = 1;
          have_bundle = 1;
        }
    }

  /* Look for: foo.framework/Versions/Current/whatev */

  if (have_bundle == 0
      && (i = strrstr (filepath, "Versions")) != NULL
      && i > filepath + 2)
    {
      j = strrchr_bounded (filepath, i - 2, '/');
      if (j == filepath || j == NULL)
        {
          if (*filepath == '/')
            bundle_name_start = filepath + 1;
          else
            bundle_name_start = filepath;
          bundle_name_end = i - 1;
          deep_bundle = 1;
          have_bundle = 1;
        }
      else if (*j == '/' && j + 1 > bundle_name_start)
        {
          bundle_name_start = j + 1;
          bundle_name_end = i - 1;
          deep_bundle = 1;
          have_bundle = 1;
        }
    }

  /* Look for: QTMPEG.component/Contents/Resources/Dutch.lproj/Localized.rsrc 
     Should return Dutch.lproj here, or a shallow bundle on the 
     iPhone platform  */

  if (have_bundle == 0
      && (i = strrchr (filepath, '/')) != NULL)
    {
      /* if there is no preceding pathname component before I */
      if (i < filepath + 2)
        return NULL;

      j = strrchr_bounded (filepath, i - 1, '/');
      if (j == filepath || j == NULL)
        {
          if (strrchr_bounded (filepath, i, '.') != NULL)
            {
              bundle_name_start = filepath;
              bundle_name_end = i;
              have_bundle = 1;
            }
        }
      else if (*j == '/' && j + 1 > bundle_name_start)
        {
          if (strrchr_bounded (j + 1, i, '.') != NULL)
            {
              bundle_name_start = j + 1;
              bundle_name_end = i;
              have_bundle = 1;
            }
        }
    }

  if (have_bundle == 0)
    return NULL;
  if (bundle_name_start == NULL || bundle_name_end == NULL)
    return NULL;
  if (bundle_name_start < filepath || bundle_name_end < filepath)
    return NULL;
  if (bundle_name_start == bundle_name_end)
    return NULL;
  if (bundle_name_start + 1 == bundle_name_end)
    return NULL;

  /* Now inspect the characters between bundle_name_start and bundle_name_end
     to see if it looks like <chars> <dot> <alpha-chars>.  */

  const char *dot = strrchr_bounded (bundle_name_start, bundle_name_end, '.');

  if (dot == bundle_name_start)
    return NULL;
  if (dot + 1 == bundle_name_end)
    return NULL;
  /* this should not happen -- we did something wrong if we didn't find
     a dot in the bundle name -- but guard against it so we don't crash.  */
  if (dot == NULL)
    return NULL;

  for (i = dot + 1; i < bundle_name_end; i++)
    {
      if (!isalpha (*i))
        return NULL;
    }

  return bundle_name_start;
}

/* For the binary file at FILENAME, return all Mach-O LC_UUIDs.
   In a typical thin binary, one uuid will be returned.
   In a universal aka fat binary there may be multiple UUIDs returned.
   If the file is absent or is not a binary, NULL is returned.
   Freeing of the returned array is the responsibility of the caller;
   use the free_uuids_array() utility function to do it.  */

uint8_t **
get_binary_file_uuids (const char *filename)
{
  if (filename == NULL || !file_exists_p (filename))
    return NULL;

  // pre allocate 8 slots plus one for the terminating NULL pointer
  uint8_t uuid[16];
  int current_uuids_slot = 0;
  int uuids_size = 8;
  uint8_t **uuids = (uint8_t**) xmalloc (sizeof (uint8_t *) * uuids_size + 1);
  bfd *abfd = NULL;
  struct gdb_exception e;

  TRY_CATCH (e, RETURN_MASK_ERROR)
  {
    abfd = symfile_bfd_open (filename, 0, GDB_OSABI_UNKNOWN);
  }

  if (abfd == NULL || e.reason == RETURN_ERROR)
    return NULL;

  if (bfd_check_format (abfd, bfd_archive)
      && strcmp (bfd_get_target (abfd), "mach-o-fat") == 0)
    {
      bfd *nbfd = NULL;
      for (;;)
        {
          nbfd = bfd_openr_next_archived_file (abfd, nbfd);
          if (nbfd == NULL)
            break;
          if (!bfd_check_format (nbfd, bfd_object) 
              && !bfd_check_format (nbfd, bfd_archive))
            continue;

          if (!bfd_mach_o_get_uuid (nbfd, uuid, sizeof (uuid)))
            return NULL;

          if (current_uuids_slot >= uuids_size)
            {
              uuids_size += 8;
              uuids = (uint8_t**) xrealloc (uuids, sizeof (uint8_t*) * uuids_size + 1);
              if (uuids == NULL)
                return NULL;
            }
          uuids[current_uuids_slot] = (uint8_t *) xmalloc (sizeof (uuid));
          memcpy (uuids[current_uuids_slot], uuid, sizeof (uuid));
          current_uuids_slot++;
        }
      bfd_free_cached_info (abfd);
    }
  else
    {
      if (!bfd_mach_o_get_uuid (abfd, uuid, sizeof (uuid)))
        return NULL;

      uuids[0] = (uint8_t *) xmalloc (sizeof (uuid));
      memcpy (uuids[current_uuids_slot++], uuid, sizeof (uuid));
    }
  uuids[current_uuids_slot] = NULL;
  bfd_close (abfd);
  return uuids;
}

/* Free the array allocated and returned by get_binary_file_uuids() */

void
free_uuids_array (uint8_t **uuids)
{
  int i;
  if (uuids == NULL)
    return;
  for (i = 0; uuids[i] != NULL; i++)
    xfree (uuids[i]);
  xfree (uuids);
}

char *
puuid (uint8_t *uuid)
{
  char *str = get_cell ();
  uuid_unparse_upper (uuid, str);
  return str;
}

static int orig_file_rlimit;

void 
restore_file_rlimit ()
{
  struct rlimit limit;
  if (orig_file_rlimit == 0)
    return;

  getrlimit (RLIMIT_NOFILE, &limit);
  limit.rlim_cur = orig_file_rlimit;
  setrlimit (RLIMIT_NOFILE, &limit);
}

void 
unlimit_file_rlimit ()
{
  struct rlimit limit;
  rlim_t reserve;
  int ret;

  getrlimit (RLIMIT_NOFILE, &limit);
  orig_file_rlimit = limit.rlim_cur;
  limit.rlim_cur = limit.rlim_max;
  ret = setrlimit (RLIMIT_NOFILE, &limit);
  if (ret != 0)
    {
      /* Okay, that didn't work, let's try something that's at least
         reasonably big: */
      limit.rlim_cur = 10000;
      ret = setrlimit (RLIMIT_NOFILE, &limit);
    }
  /* rlim_max is set to RLIM_INFINITY on X, at least on Leopard &
     SnowLeopard.  so it's better to see what we really got and use
     cur, not max below...  */ 
  getrlimit (RLIMIT_NOFILE, &limit);

  /* Reserve 10% of file descriptors for non-BFD uses, or 5, whichever
     is greater.  Allocate at least one file descriptor for use by
     BFD. */

  reserve = limit.rlim_cur * 0.1;
  reserve = (reserve > 5) ? reserve : 5;
  if (reserve >= limit.rlim_cur)
    {
      bfd_set_cache_max_open (1);
    }
  else
    {
      bfd_set_cache_max_open (limit.rlim_cur - reserve);
    }
}