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| 1 /* Invoke fopen, but avoid some glitches. |
| 2 |
| 3 Copyright (C) 2001, 2004, 2005, 2006 Free Software Foundation, Inc. |
| 4 |
| 5 This program is free software: you can redistribute it and/or modify |
| 6 it under the terms of the GNU General Public License as published by |
| 7 the Free Software Foundation; either version 3 of the License, or |
| 8 (at your option) any later version. |
| 9 |
| 10 This program is distributed in the hope that it will be useful, |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 GNU General Public License for more details. |
| 14 |
| 15 You should have received a copy of the GNU General Public License |
| 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 17 |
| 18 /* Written by Paul Eggert. */ |
| 19 |
| 20 #include <config.h> |
| 21 |
| 22 #include "stdio-safer.h" |
| 23 |
| 24 #include <errno.h> |
| 25 #include <unistd.h> |
| 26 #include "unistd-safer.h" |
| 27 |
| 28 #ifndef STDERR_FILENO |
| 29 # define STDERR_FILENO 2 |
| 30 #endif |
| 31 |
| 32 /* Like fopen, but do not return stdin, stdout, or stderr. */ |
| 33 |
| 34 FILE * |
| 35 fopen_safer (char const *file, char const *mode) |
| 36 { |
| 37 FILE *fp = fopen (file, mode); |
| 38 |
| 39 if (fp) |
| 40 { |
| 41 int fd = fileno (fp); |
| 42 |
| 43 if (0 <= fd && fd <= STDERR_FILENO) |
| 44 { |
| 45 int f = dup_safer (fd); |
| 46 |
| 47 if (f < 0) |
| 48 { |
| 49 int e = errno; |
| 50 fclose (fp); |
| 51 errno = e; |
| 52 return NULL; |
| 53 } |
| 54 |
| 55 if (fclose (fp) != 0 |
| 56 || ! (fp = fdopen (f, mode))) |
| 57 { |
| 58 int e = errno; |
| 59 close (f); |
| 60 errno = e; |
| 61 return NULL; |
| 62 } |
| 63 } |
| 64 } |
| 65 |
| 66 return fp; |
| 67 } |
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