This file is type.def, from which is created type.c.
It implements the builtin "type" in Bash.
Copyright (C) 1987-2002 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash 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, or (at your option) any later
version.
Bash 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 Bash; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
$PRODUCES type.c
$BUILTIN type
$FUNCTION type_builtin
$SHORT_DOC type [-afptP] name [name ...]
For each NAME, indicate how it would be interpreted if used as a
command name.
If the -t option is used, `type' outputs a single word which is one of
`alias', `keyword', `function', `builtin', `file' or `', if NAME is an
alias, shell reserved word, shell function, shell builtin, disk file,
or unfound, respectively.
If the -p flag is used, `type' either returns the name of the disk
file that would be executed, or nothing if `type -t NAME' would not
return `file'.
If the -a flag is used, `type' displays all of the places that contain
an executable named `file'. This includes aliases, builtins, and
functions, if and only if the -p flag is not also used.
The -f flag suppresses shell function lookup.
The -P flag forces a PATH search for each NAME, even if it is an alias,
builtin, or function, and returns the name of the disk file that would
be executed.
$END
#include <config.h>
#include "../bashtypes.h"
#include "posixstat.h"
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include <stdio.h>
#include "../bashansi.h"
#include "../bashintl.h"
#include "../shell.h"
#include "../findcmd.h"
#include "../hashcmd.h"
#if defined (ALIAS)
#include "../alias.h"
#endif /* ALIAS */
#include "common.h"
#include "bashgetopt.h"
extern int find_reserved_word __P((char *));
extern char *this_command_name;
extern int expand_aliases, posixly_correct;
/* For each word in LIST, find out what the shell is going to do with
it as a simple command. i.e., which file would this shell use to
execve, or if it is a builtin command, or an alias. Possible flag
arguments:
-t Returns the "type" of the object, one of
`alias', `keyword', `function', `builtin',
or `file'.
-p Returns the pathname of the file if -type is
a file.
-a Returns all occurrences of words, whether they
be a filename in the path, alias, function,
or builtin.
-f Suppress shell function lookup, like `command'.
-P Force a path search even in the presence of other
definitions.
Order of evaluation:
alias
keyword
function
builtin
file
*/
int
type_builtin (list)
WORD_LIST *list;
{
int dflags, successful_finds, opt;
WORD_LIST *this;
if (list == 0)
return (EXECUTION_SUCCESS);
dflags = CDESC_SHORTDESC; /* default */
successful_finds = 0;
/* Handle the obsolescent `-type', `-path', and `-all' by prescanning
the arguments and converting those options to the form that
internal_getopt recognizes. Converts `--type', `--path', and `--all'
also. THIS SHOULD REALLY GO AWAY. */
for (this = list; this && this->word->word[0] == '-'; this = this->next)
{
char *flag = &(this->word->word[1]);
if (STREQ (flag, "type") || STREQ (flag, "-type"))
{
this->word->word[1] = 't';
this->word->word[2] = '\0';
}
else if (STREQ (flag, "path") || STREQ (flag, "-path"))
{
this->word->word[1] = 'p';
this->word->word[2] = '\0';
}
else if (STREQ (flag, "all") || STREQ (flag, "-all"))
{
this->word->word[1] = 'a';
this->word->word[2] = '\0';
}
}
reset_internal_getopt ();
while ((opt = internal_getopt (list, "afptP")) != -1)
{
switch (opt)
{
case 'a':
dflags |= CDESC_ALL;
break;
case 'f':
dflags |= CDESC_NOFUNCS;
break;
case 'p':
dflags |= CDESC_PATH_ONLY;
dflags &= ~(CDESC_TYPE|CDESC_SHORTDESC);
break;
case 't':
dflags |= CDESC_TYPE;
dflags &= ~(CDESC_PATH_ONLY|CDESC_SHORTDESC);
break;
case 'P': /* shorthand for type -ap */
dflags |= (CDESC_PATH_ONLY|CDESC_FORCE_PATH);
dflags &= ~(CDESC_TYPE|CDESC_SHORTDESC);
break;
default:
builtin_usage ();
return (EX_USAGE);
}
}
list = loptend;
while (list)
{
int found;
found = describe_command (list->word->word, dflags);
if (!found && (dflags & (CDESC_PATH_ONLY|CDESC_TYPE)) == 0)
sh_notfound (list->word->word);
successful_finds += found;
list = list->next;
}
fflush (stdout);
return ((successful_finds != 0) ? EXECUTION_SUCCESS : EXECUTION_FAILURE);
}
/*
* Describe COMMAND as required by the type and command builtins.
*
* Behavior is controlled by DFLAGS. Flag values are
* CDESC_ALL print all descriptions of a command
* CDESC_SHORTDESC print the description for type and command -V
* CDESC_REUSABLE print in a format that may be reused as input
* CDESC_TYPE print the type for type -t
* CDESC_PATH_ONLY print the path for type -p
* CDESC_FORCE_PATH force a path search for type -P
* CDESC_NOFUNCS skip function lookup for type -f
* CDESC_ABSPATH convert to absolute path, no ./ prefix
*
* CDESC_ALL says whether or not to look for all occurrences of COMMAND, or
* return after finding it once.
*/
int
describe_command (command, dflags)
char *command;
int dflags;
{
int found, i, found_file, f, all;
char *full_path, *x;
SHELL_VAR *func;
#if defined (ALIAS)
alias_t *alias;
#endif
all = (dflags & CDESC_ALL) != 0;
found = found_file = 0;
full_path = (char *)NULL;
#if defined (ALIAS)
/* Command is an alias? */
if (((dflags & CDESC_FORCE_PATH) == 0) && expand_aliases && (alias = find_alias (command)))
{
if (dflags & CDESC_TYPE)
puts ("alias");
else if (dflags & CDESC_SHORTDESC)
printf (_("%s is aliased to `%s'\n"), command, alias->value);
else if (dflags & CDESC_REUSABLE)
{
x = sh_single_quote (alias->value);
printf ("alias %s=%s\n", command, x);
free (x);
}
found = 1;
if (all == 0)
return (1);
}
#endif /* ALIAS */
/* Command is a shell reserved word? */
if (((dflags & CDESC_FORCE_PATH) == 0) && (i = find_reserved_word (command)) >= 0)
{
if (dflags & CDESC_TYPE)
puts ("keyword");
else if (dflags & CDESC_SHORTDESC)
printf (_("%s is a shell keyword\n"), command);
else if (dflags & CDESC_REUSABLE)
printf ("%s\n", command);
found = 1;
if (all == 0)
return (1);
}
/* Command is a function? */
if (((dflags & (CDESC_FORCE_PATH|CDESC_NOFUNCS)) == 0) && (func = find_function (command)))
{
if (dflags & CDESC_TYPE)
puts ("function");
else if (dflags & CDESC_SHORTDESC)
{
#define PRETTY_PRINT_FUNC 1
char *result;
printf (_("%s is a function\n"), command);
/* We're blowing away THE_PRINTED_COMMAND here... */
result = named_function_string (command,
(COMMAND *) function_cell (func),
PRETTY_PRINT_FUNC);
printf ("%s\n", result);
#undef PRETTY_PRINT_FUNC
}
else if (dflags & CDESC_REUSABLE)
printf ("%s\n", command);
found = 1;
if (all == 0)
return (1);
}
/* Command is a builtin? */
if (((dflags & CDESC_FORCE_PATH) == 0) && find_shell_builtin (command))
{
if (dflags & CDESC_TYPE)
puts ("builtin");
else if (dflags & CDESC_SHORTDESC)
printf (_("%s is a shell builtin\n"), command);
else if (dflags & CDESC_REUSABLE)
printf ("%s\n", command);
found = 1;
if (all == 0)
return (1);
}
/* Command is a disk file? */
/* If the command name given is already an absolute command, just
check to see if it is executable. */
if (absolute_program (command))
{
f = file_status (command);
if (f & FS_EXECABLE)
{
if (dflags & CDESC_TYPE)
puts ("file");
else if (dflags & CDESC_SHORTDESC)
printf (_("%s is %s\n"), command, command);
else if (dflags & (CDESC_REUSABLE|CDESC_PATH_ONLY))
printf ("%s\n", command);
/* There's no use looking in the hash table or in $PATH,
because they're not consulted when an absolute program
name is supplied. */
return (1);
}
}
/* If the user isn't doing "-a", then we might care about
whether the file is present in our hash table. */
if (all == 0 || (dflags & CDESC_FORCE_PATH))
{
if (full_path = phash_search (command))
{
if (dflags & CDESC_TYPE)
puts ("file");
else if (dflags & CDESC_SHORTDESC)
printf (_("%s is hashed (%s)\n"), command, full_path);
else if (dflags & (CDESC_REUSABLE|CDESC_PATH_ONLY))
printf ("%s\n", full_path);
free (full_path);
return (1);
}
}
/* Now search through $PATH. */
while (1)
{
if (all == 0)
full_path = find_user_command (command);
else
full_path =
user_command_matches (command, FS_EXEC_ONLY, found_file);
/* XXX - should that be FS_EXEC_PREFERRED? */
if (!full_path)
break;
/* If we found the command as itself by looking through $PATH, it
probably doesn't exist. Check whether or not the command is an
executable file. If it's not, don't report a match. This is
the default posix mode behavior */
if (STREQ (full_path, command) || posixly_correct)
{
f = file_status (full_path);
if ((f & FS_EXECABLE) == 0)
{
free (full_path);
full_path = (char *)NULL;
if (all == 0)
break;
}
else if (ABSPATH (full_path))
; /* placeholder; don't need to do anything yet */
else if (dflags & (CDESC_REUSABLE|CDESC_PATH_ONLY|CDESC_SHORTDESC))
{
f = MP_DOCWD | ((dflags & CDESC_ABSPATH) ? MP_RMDOT : 0);
full_path = sh_makepath ((char *)NULL, full_path, f);
}
}
/* If we require a full path and don't have one, make one */
else if ((dflags & CDESC_ABSPATH) && ABSPATH (full_path) == 0)
full_path = sh_makepath ((char *)NULL, full_path, MP_DOCWD|MP_RMDOT);
found_file++;
found = 1;
if (dflags & CDESC_TYPE)
puts ("file");
else if (dflags & CDESC_SHORTDESC)
printf ("%s is %s\n", command, full_path);
else if (dflags & (CDESC_REUSABLE|CDESC_PATH_ONLY))
printf ("%s\n", full_path);
free (full_path);
full_path = (char *)NULL;
if (all == 0)
break;
}
return (found);
}