/* Utility to pick a temporary filename prefix. Copyright (C) 1996 Free Software Foundation, Inc. This file is part of the libiberty library. Libiberty is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Libiberty 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with libiberty; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* This file exports one function: choose_temp_base. */ /* This file lives in at least two places: libiberty and gcc. Don't change one without the other. */ #ifndef NO_SYS_FILE_H #include #include /* May get R_OK, etc. on some systems. */ #endif #ifndef R_OK #define R_OK 4 #define W_OK 2 #define X_OK 1 #endif #include /* May get P_tmpdir. */ #ifdef IN_GCC #include "config.h" #include "gansidecl.h" extern char *xmalloc (); #else #include "ansidecl.h" #include "libiberty.h" #if defined (__MSDOS__) || defined (_WIN32) #define DIR_SEPARATOR '\\' #endif #endif #ifndef DIR_SEPARATOR #define DIR_SEPARATOR '/' #endif /* On MSDOS, write temp files in current dir because there's no place else we can expect to use. */ /* ??? Although the current directory is tried as a last resort, this is left in so that on MSDOS it is prefered to /tmp on the off chance that someone requires this, since that was the previous behaviour. */ #ifdef __MSDOS__ #ifndef P_tmpdir #define P_tmpdir "." #endif #endif /* Name of temporary file. mktemp requires 6 trailing X's. */ #define TEMP_FILE "ccXXXXXX" /* Subroutine of choose_temp_base. If BASE is non-NULL, returh it. Otherwise it checks if DIR is a usable directory. If success, DIR is returned. Otherwise NULL is returned. */ static char * try (dir, base) char *dir, *base; { if (base != 0) return base; if (dir != 0 && access (dir, R_OK | W_OK) == 0) return dir; return 0; } /* Return a prefix for temporary file names or NULL if unable to find one. The current directory is chosen if all else fails so the program is exited if a temporary directory can't be found (mktemp fails). The buffer for the result is obtained with xmalloc. */ char * choose_temp_base () { char *base = 0; char *temp_filename; int len; static char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; static char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; #ifndef MPW base = try (getenv ("TMPDIR"), base); base = try (getenv ("TMP"), base); base = try (getenv ("TEMP"), base); #ifdef P_tmpdir base = try (P_tmpdir, base); #endif /* Try /usr/tmp, then /tmp. */ base = try (usrtmp, base); base = try (tmp, base); /* If all else fails, use the current directory! */ if (base == 0) base = "."; #else /* MPW */ base = ":"; #endif len = strlen (base); if (len == 0) abort (); temp_filename = xmalloc (len + 1 /*DIR_SEPARATOR*/ + strlen (TEMP_FILE) + 1); strcpy (temp_filename, base); #ifndef MPW if (temp_filename[len-1] != '/' && temp_filename[len-1] != DIR_SEPARATOR) temp_filename[len++] = DIR_SEPARATOR; #else /* MPW */ if (temp_filename[len-1] != ':') temp_filename[len++] = ':'; #endif /* MPW */ strcpy (temp_filename + len, TEMP_FILE); mktemp (temp_filename); if (strlen (temp_filename) == 0) abort (); return temp_filename; }