64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
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/* Invoke fopen, but avoid some glitches.
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Copyright (C) 2001, 2004-2006, 2009-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert. */
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#include <config.h>
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#include "stdio-safer.h"
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#include <errno.h>
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#include <unistd.h>
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#include "unistd-safer.h"
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/* Like fopen, but do not return stdin, stdout, or stderr. */
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FILE *
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fopen_safer (char const *file, char const *mode)
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{
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FILE *fp = fopen (file, mode);
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if (fp)
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{
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int fd = fileno (fp);
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if (0 <= fd && fd <= STDERR_FILENO)
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{
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int f = dup_safer (fd);
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if (f < 0)
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{
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int e = errno;
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fclose (fp);
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errno = e;
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return NULL;
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}
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if (fclose (fp) != 0
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|| ! (fp = fdopen (f, mode)))
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{
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int e = errno;
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close (f);
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errno = e;
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return NULL;
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}
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}
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}
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return fp;
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}
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