68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
|
/* 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;
|
||
|
|
}
|