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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /debug/fgets_chk.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
Diffstat (limited to 'debug/fgets_chk.c')
-rw-r--r--debug/fgets_chk.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/debug/fgets_chk.c b/debug/fgets_chk.c
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+/* Copyright (C) 1993, 1995, 1996, 1997, 1998, 1999, 2002, 2003, 2005
+ Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA.
+
+ As a special exception, if you link the code in this file with
+ files compiled with a GNU compiler to produce an executable,
+ that does not cause the resulting executable to be covered by
+ the GNU Lesser General Public License. This exception does not
+ however invalidate any other reasons why the executable file
+ might be covered by the GNU Lesser General Public License.
+ This exception applies to code released by its copyright holders
+ in files containing the exception. */
+
+#include "libioP.h"
+#include <stdio.h>
+#include <sys/param.h>
+
+char *
+__fgets_chk (buf, size, n, fp)
+ char *buf;
+ size_t size;
+ int n;
+ _IO_FILE *fp;
+{
+ _IO_size_t count;
+ char *result;
+ CHECK_FILE (fp, NULL);
+ if (n <= 0)
+ return NULL;
+ _IO_acquire_lock (fp);
+ /* This is very tricky since a file descriptor may be in the
+ non-blocking mode. The error flag doesn't mean much in this
+ case. We return an error only when there is a new error. */
+ int old_error = fp->_IO_file_flags & _IO_ERR_SEEN;
+ fp->_IO_file_flags &= ~_IO_ERR_SEEN;
+ count = INTUSE(_IO_getline) (fp, buf, MIN ((size_t) n - 1, size), '\n', 1);
+ /* If we read in some bytes and errno is EAGAIN, that error will
+ be reported for next read. */
+ if (count == 0 || ((fp->_IO_file_flags & _IO_ERR_SEEN)
+ && errno != EAGAIN))
+ result = NULL;
+ else if (count >= size)
+ __chk_fail ();
+ else
+ {
+ buf[count] = '\0';
+ result = buf;
+ }
+ fp->_IO_file_flags |= old_error;
+ _IO_release_lock (fp);
+ return result;
+}