189857Sobrien/* Utility to pick a temporary filename prefix. 289857Sobrien Copyright (C) 1996, 1997, 1998, 2001 Free Software Foundation, Inc. 389857Sobrien 489857SobrienThis file is part of the libiberty library. 589857SobrienLibiberty is free software; you can redistribute it and/or 689857Sobrienmodify it under the terms of the GNU Library General Public 789857SobrienLicense as published by the Free Software Foundation; either 889857Sobrienversion 2 of the License, or (at your option) any later version. 989857Sobrien 1089857SobrienLibiberty is distributed in the hope that it will be useful, 1189857Sobrienbut WITHOUT ANY WARRANTY; without even the implied warranty of 1289857SobrienMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1389857SobrienLibrary General Public License for more details. 1489857Sobrien 1589857SobrienYou should have received a copy of the GNU Library General Public 1689857SobrienLicense along with libiberty; see the file COPYING.LIB. If not, 17218822Sdimwrite to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, 18218822SdimBoston, MA 02110-1301, USA. */ 1989857Sobrien 2089857Sobrien#ifdef HAVE_CONFIG_H 2189857Sobrien#include "config.h" 2289857Sobrien#endif 2389857Sobrien 2489857Sobrien#include <stdio.h> /* May get P_tmpdir. */ 2589857Sobrien#include <sys/types.h> 2689857Sobrien#ifdef HAVE_UNISTD_H 2789857Sobrien#include <unistd.h> 2889857Sobrien#endif 2989857Sobrien#ifdef HAVE_STDLIB_H 3089857Sobrien#include <stdlib.h> 3189857Sobrien#endif 3289857Sobrien#ifdef HAVE_STRING_H 3389857Sobrien#include <string.h> 3489857Sobrien#endif 3589857Sobrien#ifdef HAVE_SYS_FILE_H 3689857Sobrien#include <sys/file.h> /* May get R_OK, etc. on some systems. */ 3789857Sobrien#endif 3889857Sobrien 3989857Sobrien#ifndef R_OK 4089857Sobrien#define R_OK 4 4189857Sobrien#define W_OK 2 4289857Sobrien#define X_OK 1 4389857Sobrien#endif 4489857Sobrien 4589857Sobrien#include "libiberty.h" 46218822Sdimextern int mkstemps (char *, int); 4789857Sobrien 4889857Sobrien/* '/' works just fine on MS-DOS based systems. */ 4989857Sobrien#ifndef DIR_SEPARATOR 5089857Sobrien#define DIR_SEPARATOR '/' 5189857Sobrien#endif 5289857Sobrien 5389857Sobrien/* Name of temporary file. 5489857Sobrien mktemp requires 6 trailing X's. */ 5589857Sobrien#define TEMP_FILE "ccXXXXXX" 5689857Sobrien#define TEMP_FILE_LEN (sizeof(TEMP_FILE) - 1) 5789857Sobrien 5889857Sobrien/* Subroutine of choose_tmpdir. 5989857Sobrien If BASE is non-NULL, return it. 6089857Sobrien Otherwise it checks if DIR is a usable directory. 6189857Sobrien If success, DIR is returned. 6289857Sobrien Otherwise NULL is returned. */ 6389857Sobrien 64218822Sdimstatic inline const char *try_dir (const char *, const char *); 6589857Sobrien 6689857Sobrienstatic inline const char * 67218822Sdimtry_dir (const char *dir, const char *base) 6889857Sobrien{ 6989857Sobrien if (base != 0) 7089857Sobrien return base; 7189857Sobrien if (dir != 0 7289857Sobrien && access (dir, R_OK | W_OK | X_OK) == 0) 7389857Sobrien return dir; 7489857Sobrien return 0; 7589857Sobrien} 7689857Sobrien 7789857Sobrienstatic const char tmp[] = { DIR_SEPARATOR, 't', 'm', 'p', 0 }; 7889857Sobrienstatic const char usrtmp[] = 7989857Sobrien{ DIR_SEPARATOR, 'u', 's', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; 8089857Sobrienstatic const char vartmp[] = 8189857Sobrien{ DIR_SEPARATOR, 'v', 'a', 'r', DIR_SEPARATOR, 't', 'm', 'p', 0 }; 8289857Sobrien 8389857Sobrienstatic char *memoized_tmpdir; 8489857Sobrien 8589857Sobrien/* 8689857Sobrien 8789857Sobrien@deftypefn Replacement char* choose_tmpdir () 8889857Sobrien 8989857SobrienReturns a pointer to a directory path suitable for creating temporary 9089857Sobrienfiles in. 9189857Sobrien 9289857Sobrien@end deftypefn 9389857Sobrien 9489857Sobrien*/ 9589857Sobrien 9689857Sobrienchar * 97218822Sdimchoose_tmpdir (void) 9889857Sobrien{ 9989857Sobrien const char *base = 0; 10089857Sobrien char *tmpdir; 10189857Sobrien unsigned int len; 10289857Sobrien 10389857Sobrien if (memoized_tmpdir) 10489857Sobrien return memoized_tmpdir; 10589857Sobrien 106218822Sdim base = try_dir (getenv ("TMPDIR"), base); 107218822Sdim base = try_dir (getenv ("TMP"), base); 108218822Sdim base = try_dir (getenv ("TEMP"), base); 10989857Sobrien 11089857Sobrien#ifdef P_tmpdir 111218822Sdim base = try_dir (P_tmpdir, base); 11289857Sobrien#endif 11389857Sobrien 11489857Sobrien /* Try /var/tmp, /usr/tmp, then /tmp. */ 115218822Sdim base = try_dir (vartmp, base); 116218822Sdim base = try_dir (usrtmp, base); 117218822Sdim base = try_dir (tmp, base); 11889857Sobrien 11989857Sobrien /* If all else fails, use the current directory! */ 12089857Sobrien if (base == 0) 12189857Sobrien base = "."; 12289857Sobrien 12389857Sobrien /* Append DIR_SEPARATOR to the directory we've chosen 12489857Sobrien and return it. */ 12589857Sobrien len = strlen (base); 126218822Sdim tmpdir = XNEWVEC (char, len + 2); 12789857Sobrien strcpy (tmpdir, base); 12889857Sobrien tmpdir[len] = DIR_SEPARATOR; 12989857Sobrien tmpdir[len+1] = '\0'; 13089857Sobrien 13189857Sobrien memoized_tmpdir = tmpdir; 13289857Sobrien return tmpdir; 13389857Sobrien} 13489857Sobrien 13589857Sobrien/* 13689857Sobrien 13789857Sobrien@deftypefn Replacement char* make_temp_file (const char *@var{suffix}) 13889857Sobrien 13989857SobrienReturn a temporary file name (as a string) or @code{NULL} if unable to 14089857Sobriencreate one. @var{suffix} is a suffix to append to the file name. The 14189857Sobrienstring is @code{malloc}ed, and the temporary file has been created. 14289857Sobrien 14389857Sobrien@end deftypefn 14489857Sobrien 14589857Sobrien*/ 14689857Sobrien 14789857Sobrienchar * 148218822Sdimmake_temp_file (const char *suffix) 14989857Sobrien{ 15089857Sobrien const char *base = choose_tmpdir (); 15189857Sobrien char *temp_filename; 15289857Sobrien int base_len, suffix_len; 15389857Sobrien int fd; 15489857Sobrien 15589857Sobrien if (suffix == 0) 15689857Sobrien suffix = ""; 15789857Sobrien 15889857Sobrien base_len = strlen (base); 15989857Sobrien suffix_len = strlen (suffix); 16089857Sobrien 161218822Sdim temp_filename = XNEWVEC (char, base_len 16289857Sobrien + TEMP_FILE_LEN 16389857Sobrien + suffix_len + 1); 16489857Sobrien strcpy (temp_filename, base); 16589857Sobrien strcpy (temp_filename + base_len, TEMP_FILE); 16689857Sobrien strcpy (temp_filename + base_len + TEMP_FILE_LEN, suffix); 16789857Sobrien 16889857Sobrien fd = mkstemps (temp_filename, suffix_len); 16989857Sobrien /* If mkstemps failed, then something bad is happening. Maybe we should 17089857Sobrien issue a message about a possible security attack in progress? */ 17189857Sobrien if (fd == -1) 17289857Sobrien abort (); 17389857Sobrien /* Similarly if we can not close the file. */ 17489857Sobrien if (close (fd)) 17589857Sobrien abort (); 17689857Sobrien return temp_filename; 17789857Sobrien} 178