| /* Utility to pick a temporary filename prefix. |
| Copyright (C) 1996-2017 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> |
| #include <errno.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 |
| #if defined(_WIN32) && !defined(__CYGWIN__) |
| #include <windows.h> |
| #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) |
| |
| #if !defined(_WIN32) || defined(__CYGWIN__) |
| |
| /* 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 }; |
| |
| #endif |
| |
| static char *memoized_tmpdir; |
| |
| /* |
| |
| @deftypefn Replacement const char* choose_tmpdir () |
| |
| Returns a pointer to a directory path suitable for creating temporary |
| files in. |
| |
| @end deftypefn |
| |
| */ |
| |
| const char * |
| choose_tmpdir (void) |
| { |
| if (!memoized_tmpdir) |
| { |
| #if !defined(_WIN32) || defined(__CYGWIN__) |
| const char *base = 0; |
| char *tmpdir; |
| unsigned int len; |
| |
| #ifdef VMS |
| /* Try VMS standard temp logical. */ |
| base = try_dir ("/sys$scratch", base); |
| #else |
| base = try_dir (getenv ("TMPDIR"), base); |
| base = try_dir (getenv ("TMP"), base); |
| base = try_dir (getenv ("TEMP"), base); |
| #endif |
| |
| #ifdef P_tmpdir |
| /* We really want a directory name here as if concatenated with say \dir |
| we do not end up with a double \\ which defines an UNC path. */ |
| if (strcmp (P_tmpdir, "\\") == 0) |
| base = try_dir ("\\.", base); |
| else |
| 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; |
| #else /* defined(_WIN32) && !defined(__CYGWIN__) */ |
| DWORD len; |
| |
| /* Figure out how much space we need. */ |
| len = GetTempPath(0, NULL); |
| if (len) |
| { |
| memoized_tmpdir = XNEWVEC (char, len); |
| if (!GetTempPath(len, memoized_tmpdir)) |
| { |
| XDELETEVEC (memoized_tmpdir); |
| memoized_tmpdir = NULL; |
| } |
| } |
| if (!memoized_tmpdir) |
| /* If all else fails, use the current directory. */ |
| memoized_tmpdir = xstrdup (".\\"); |
| #endif /* defined(_WIN32) && !defined(__CYGWIN__) */ |
| } |
| |
| return memoized_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); |
| /* Mkstemps failed. It may be EPERM, ENOSPC etc. */ |
| if (fd == -1) |
| { |
| fprintf (stderr, "Cannot create temporary file in %s: %s\n", |
| base, strerror (errno)); |
| abort (); |
| } |
| /* We abort on failed close out of sheer paranoia. */ |
| if (close (fd)) |
| abort (); |
| return temp_filename; |
| } |