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[/] [openrisc/] [tags/] [gdb/] [gdb-6.8/] [gdb-6.8.openrisc-2.1/] [libiberty/] [make-temp-file.c] - Rev 419
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/* Utility to pick a temporary filename prefix. Copyright (C) 1996, 1997, 1998, 2001 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include <stdio.h> /* May get P_tmpdir. */ #include <sys/types.h> #ifdef HAVE_UNISTD_H #include <unistd.h> #endif #ifdef HAVE_STDLIB_H #include <stdlib.h> #endif #ifdef HAVE_STRING_H #include <string.h> #endif #ifdef HAVE_SYS_FILE_H #include <sys/file.h> /* 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 "libiberty.h" extern int mkstemps (char *, int); /* '/' works just fine on MS-DOS based systems. */ #ifndef DIR_SEPARATOR #define DIR_SEPARATOR '/' #endif /* Name of temporary file. mktemp requires 6 trailing X's. */ #define TEMP_FILE "ccXXXXXX" #define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1) /* Subroutine of choose_tmpdir. If BASE is non-NULL, return it. Otherwise it checks if DIR is a usable directory. If success, DIR is returned. Otherwise NULL is returned. */ static inline const char *try_dir (const char *, const char *); static inline const char * try_dir (const char *dir, const char *base) { if (base != 0) return base; if (dir != 0 && access (dir, R_OK | W_OK | X_OK) == 0) return dir; return 0; } static const char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; static const char usrtmp[] = { DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; static const char vartmp[] = { DIR_SEPARATOR, 'v', 'a', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; static char *memoized_tmpdir; /* @deftypefn Replacement char* choose_tmpdir () Returns a pointer to a directory path suitable for creating temporary files in. @end deftypefn */ char * choose_tmpdir (void) { const char *base = 0; char *tmpdir; unsigned int len; if (memoized_tmpdir) return memoized_tmpdir; base = try_dir (getenv ("TMPDIR"), base); base = try_dir (getenv ("TMP"), base); base = try_dir (getenv ("TEMP"), base); #ifdef P_tmpdir base = try_dir (P_tmpdir, base); #endif /* Try /var/tmp, /usr/tmp, then /tmp. */ base = try_dir (vartmp, base); base = try_dir (usrtmp, base); base = try_dir (tmp, base); /* If all else fails, use the current directory! */ if (base == 0) base = "."; /* Append DIR_SEPARATOR to the directory we've chosen and return it. */ len = strlen (base); tmpdir = XNEWVEC (char, len + 2); strcpy (tmpdir, base); tmpdir[len] = DIR_SEPARATOR; tmpdir[len+1] = '\0'; memoized_tmpdir = tmpdir; return tmpdir; } /* @deftypefn Replacement char* make_temp_file (const char *@var{suffix}) Return a temporary file name (as a string) or @code{NULL} if unable to create one. @var{suffix} is a suffix to append to the file name. The string is @code{malloc}ed, and the temporary file has been created. @end deftypefn */ char * make_temp_file (const char *suffix) { const char *base = choose_tmpdir (); char *temp_filename; int base_len, suffix_len; int fd; if (suffix == 0) suffix = ""; base_len = strlen (base); suffix_len = strlen (suffix); temp_filename = XNEWVEC (char, base_len + TEMP_FILE_LEN + suffix_len + 1); strcpy (temp_filename, base); strcpy (temp_filename + base_len, TEMP_FILE); strcpy (temp_filename + base_len + TEMP_FILE_LEN, suffix); fd = mkstemps (temp_filename, suffix_len); /* If mkstemps failed, then something bad is happening. Maybe we should issue a message about a possible security attack in progress? */ if (fd == -1) abort (); /* Similarly if we can not close the file. */ if (close (fd)) abort (); return temp_filename; }
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