From e1908ae95dd4c9d19ee4dfabfc8bf8a7f85943fe Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 18:58:41 +0200 Subject: Adding upstream version 9.4. Signed-off-by: Daniel Baumann --- lib/fopen-safer.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 lib/fopen-safer.c (limited to 'lib/fopen-safer.c') diff --git a/lib/fopen-safer.c b/lib/fopen-safer.c new file mode 100644 index 0000000..bad77b8 --- /dev/null +++ b/lib/fopen-safer.c @@ -0,0 +1,63 @@ +/* Invoke fopen, but avoid some glitches. + + Copyright (C) 2001, 2004-2006, 2009-2023 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . */ + +/* Written by Paul Eggert. */ + +#include + +#include "stdio-safer.h" + +#include +#include +#include "unistd-safer.h" + +/* Like fopen, but do not return stdin, stdout, or stderr. */ + +FILE * +fopen_safer (char const *file, char const *mode) +{ + FILE *fp = fopen (file, mode); + + if (fp) + { + int fd = fileno (fp); + + if (0 <= fd && fd <= STDERR_FILENO) + { + int f = dup_safer (fd); + + if (f < 0) + { + int e = errno; + fclose (fp); + errno = e; + return NULL; + } + + if (fclose (fp) != 0 + || ! (fp = fdopen (f, mode))) + { + int e = errno; + close (f); + errno = e; + return NULL; + } + } + } + + return fp; +} -- cgit v1.2.3