/**************************************************************************** * * * GNAT COMPILER COMPONENTS * * * * E N V * * * * C Implementation File * * * * Copyright (C) 2005-2006, Free Software Foundation, Inc. * * * * GNAT is free software; you can redistribute it and/or modify it under * * terms of the GNU General Public License as published by the Free Soft- * * ware Foundation; either version 2, or (at your option) any later ver- * * sion. GNAT is distributed in the hope that it will be useful, but WITH- * * OUT 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 distributed with GNAT; see file COPYING. If not, write * * to the Free Software Foundation, 51 Franklin Street, Fifth Floor, * * Boston, MA 02110-1301, USA. * * * * As a special exception, if you link this file with other files to * * produce an executable, this file does not by itself cause the resulting * * executable to be covered by the GNU General Public License. This except- * * ion does not however invalidate any other reasons why the executable * * file might be covered by the GNU Public License. * * * * GNAT was originally developed by the GNAT team at New York University. * * Extensive contributions were provided by Ada Core Technologies Inc. * * * ****************************************************************************/ #ifdef IN_RTS #include "tconfig.h" #include "tsystem.h" #include #include #include #ifdef VMS #include #endif #if defined (__APPLE__) #include #endif #if defined (__MINGW32__) #include #endif #if defined (__vxworks) && ! (defined (__RTP__) || defined (__COREOS__)) #include "envLib.h" extern char** ppGlobalEnviron; #endif /* We don't have libiberty, so use malloc. */ #define xmalloc(S) malloc (S) #else /* IN_RTS */ #include "config.h" #include "system.h" #endif /* IN_RTS */ #include "env.h" void __gnat_getenv (char *name, int *len, char **value) { *value = getenv (name); if (!*value) *len = 0; else *len = strlen (*value); return; } /* VMS specific declarations for set_env_value. */ #ifdef VMS static char *to_host_path_spec (char *); struct descriptor_s { unsigned short len, mbz; __char_ptr32 adr; }; typedef struct _ile3 { unsigned short len, code; __char_ptr32 adr; unsigned short *retlen_adr; } ile_s; #endif void __gnat_setenv (char *name, char *value) { #ifdef MSDOS #elif defined (VMS) struct descriptor_s name_desc; /* Put in JOB table for now, so that the project stuff at least works. */ struct descriptor_s table_desc = {7, 0, "LNM$JOB"}; char *host_pathspec = value; char *copy_pathspec; int num_dirs_in_pathspec = 1; char *ptr; long status; name_desc.len = strlen (name); name_desc.mbz = 0; name_desc.adr = name; if (*host_pathspec == 0) /* deassign */ { status = LIB$DELETE_LOGICAL (&name_desc, &table_desc); /* no need to check status; if the logical name is not defined, that's fine. */ return; } ptr = host_pathspec; while (*ptr++) if (*ptr == ',') num_dirs_in_pathspec++; { int i, status; ile_s *ile_array = alloca (sizeof (ile_s) * (num_dirs_in_pathspec + 1)); char *copy_pathspec = alloca (strlen (host_pathspec) + 1); char *curr, *next; strcpy (copy_pathspec, host_pathspec); curr = copy_pathspec; for (i = 0; i < num_dirs_in_pathspec; i++) { next = strchr (curr, ','); if (next == 0) next = strchr (curr, 0); *next = 0; ile_array[i].len = strlen (curr); /* Code 2 from lnmdef.h means it's a string. */ ile_array[i].code = 2; ile_array[i].adr = curr; /* retlen_adr is ignored. */ ile_array[i].retlen_adr = 0; curr = next + 1; } /* Terminating item must be zero. */ ile_array[i].len = 0; ile_array[i].code = 0; ile_array[i].adr = 0; ile_array[i].retlen_adr = 0; status = LIB$SET_LOGICAL (&name_desc, 0, &table_desc, 0, ile_array); if ((status & 1) != 1) LIB$SIGNAL (status); } #elif defined (__vxworks) && defined (__RTP__) setenv (name, value, 1); #else size_t size = strlen (name) + strlen (value) + 2; char *expression; expression = (char *) xmalloc (size * sizeof (char)); sprintf (expression, "%s=%s", name, value); putenv (expression); #if defined (__FreeBSD__) || defined (__APPLE__) || defined (__MINGW32__) \ ||(defined (__vxworks) && ! defined (__RTP__)) /* On some systems like FreeBSD, MacOS X and Windows, putenv is making a copy of the expression string so we can free it after the call to putenv */ free (expression); #endif #endif } char ** __gnat_environ (void) { #if defined (VMS) /* Not implemented */ return NULL; #elif defined (__APPLE__) char ***result = _NSGetEnviron (); return *result; #elif defined (__MINGW32__) return _environ; #elif defined (sun) extern char **_environ; return _environ; #else #if ! (defined (__vxworks) && ! (defined (__RTP__) || defined (__COREOS__))) /* in VxWorks kernel mode environ is macro and not a variable */ /* same thing on 653 in the CoreOS */ extern char **environ; #endif return environ; #endif } void __gnat_unsetenv (char *name) { #if defined (VMS) /* Not implemented */ return; #elif defined (__hpux__) || defined (sun) \ || (defined (__mips) && defined (__sgi)) \ || (defined (__vxworks) && ! defined (__RTP__)) \ || defined (_AIX) /* On Solaris, HP-UX and IRIX there is no function to clear an environment variable. So we look for the variable in the environ table and delete it by setting the entry to NULL. This can clearly cause some memory leaks but free cannot be used on this context as not all strings in the environ have been allocated using malloc. To avoid this memory leak another method can be used. It consists in forcing the reallocation of all the strings in the environ table using malloc on the first call on the functions related to environment variable management. The disadvantage is that if a program makes a direct call to getenv the return string may be deallocated at some point. */ /* Note that on AIX, unsetenv is not supported on 5.1 but it is on 5.3. As we are still supporting AIX 5.1 we cannot use unsetenv */ char **env = __gnat_environ (); int index = 0; size_t size = strlen (name); while (env[index] != NULL) { if (strlen (env[index]) > size) { if (strstr (env[index], name) == env[index] && env[index][size] == '=') { #if defined (__vxworks) && ! defined (__RTP__) /* on Vxworks we are sure that the string has been allocated using malloc */ free (env[index]); #endif while (env[index] != NULL) { env[index]=env[index + 1]; index++; } } else index++; } else index++; } #elif defined (__MINGW32__) /* On Windows platform putenv ("key=") is equivalent to unsetenv (a subsequent call to getenv ("key") will return NULL and not the "\0" string */ size_t size = strlen (name) + 2; char *expression; expression = (char *) xmalloc (size * sizeof (char)); sprintf (expression, "%s=", name); putenv (expression); free (expression); #else unsetenv (name); #endif } void __gnat_clearenv (void) { #if defined (VMS) /* not implemented */ return; #elif defined (sun) || (defined (__mips) && defined (__sgi)) \ || (defined (__vxworks) && ! defined (__RTP__)) || defined (__Lynx__) /* On Solaris, IRIX, VxWorks (not RTPs), and Lynx there is no system call to unset a variable or to clear the environment so set all the entries in the environ table to NULL (see comment in __gnat_unsetenv for more explanation). */ char **env = __gnat_environ (); int index = 0; while (env[index] != NULL) { env[index]=NULL; index++; } #elif defined (__MINGW32__) || defined (__FreeBSD__) || defined (__APPLE__) \ || (defined (__vxworks) && defined (__RTP__)) || defined (__CYGWIN__) /* On Windows, FreeBSD and MacOS there is no function to clean all the environment but there is a "clean" way to unset a variable. So go through the environ table and call __gnat_unsetenv on all entries */ char **env = __gnat_environ (); size_t size; while (env[0] != NULL) { size = 0; while (env[0][size] != '=') size++; /* create a string that contains "name" */ size++; { char expression[size]; strncpy (expression, env[0], size); expression[size - 1] = 0; __gnat_unsetenv (expression); } } #else clearenv (); #endif }