-/* Copyright (C) 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
- This file is part of the GNU IO Library.
+/* Copyright (C) 1993-2014 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
- This library 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 2, or (at
- your option) any later version.
+ 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.
- This library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
+ 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
- General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this library; see the file COPYING. If not, write to
- the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
- MA 02111-1307, USA.
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>.
- As a special exception, if you link this library with files
- compiled with a GNU compiler to produce an executable, this does
- not cause the resulting executable to be covered by the GNU General
- Public License. This exception does not however invalidate any
- other reasons why the executable file might be covered by the GNU
- General Public License. */
+ 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>
{
_IO_size_t count;
char *result;
+ int old_error;
CHECK_FILE (fp, NULL);
if (n <= 0)
return NULL;
- _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
- _IO_flockfile (fp);
+ if (__glibc_unlikely (n == 1))
+ {
+ /* Another irregular case: since we have to store a NUL byte and
+ there is only room for exactly one byte, we don't have to
+ read anything. */
+ buf[0] = '\0';
+ return buf;
+ }
+ _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. */
+ old_error = fp->_IO_file_flags & _IO_ERR_SEEN;
+ fp->_IO_file_flags &= ~_IO_ERR_SEEN;
count = _IO_getline (fp, buf, n - 1, '\n', 1);
- if (count == 0 || (fp->_IO_file_flags & _IO_ERR_SEEN))
+ /* 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
{
buf[count] = '\0';
result = buf;
}
- _IO_cleanup_region_end (1);
+ fp->_IO_file_flags |= old_error;
+ _IO_release_lock (fp);
return result;
}
#ifdef weak_alias
weak_alias (_IO_fgets, fgets)
+
+# ifndef _IO_MTSAFE_IO
+strong_alias (_IO_fgets, __fgets_unlocked)
+libc_hidden_def (__fgets_unlocked)
+weak_alias (_IO_fgets, fgets_unlocked)
+libc_hidden_weak (fgets_unlocked)
+# endif
#endif