glibc/libio/iofgets_u.c

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/* Copyright (C) 1993-2013 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, see
<http://www.gnu.org/licenses/>.
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>
char *
fgets_unlocked (buf, n, fp)
char *buf;
int n;
_IO_FILE *fp;
{
_IO_size_t count;
char *result;
int old_error;
CHECK_FILE (fp, NULL);
if (n <= 0)
return NULL;
if (__builtin_expect (n == 1, 0))
{
/* 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;
}
/* 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;
2012-05-23 13:33:15 +02:00
count = _IO_getline (fp, buf, n - 1, '\n', 1);
Update. 1998-11-05 1998 H.J. Lu <hjl@gnu.org> * libio/iofgets.c (_IO_fgets): Don't report error if something was read in and errno is set to EAGAIN. * libio/iofgets_u.c (fgets_unlocked): Likewise. 1998-11-05 Philip Blundell <philb@gnu.org> * sysdeps/unix/sysv/linux/net/if_packet.h: Don't include kernel header; it defines too much. Provide a local definition of struct sockaddr_pkt and a comment advising against its use. 1998-11-06 1998 Andreas Schwab <schwab@issan.cs.uni-dortmund.de> * extra-lib.mk: Avoid empty include list. 1998-11-04 Andreas Schwab <schwab@issan.cs.uni-dortmund.de> * extra-lib.mk: Add support for $(lib)-shared-only-routines. * elf/Makefile (libdl-routines): Add dlopenold only if doing versioning. (libdl-shared-only-routines): New variable. 1998-11-06 Paul Eggert <eggert@twinsun.com> Don't invoke localtime_r or gmtime_r unless it's the GNU C library's localtime_r and gmtime_r; there are too many buggy implementations of localtime_r and gmtime_r out there, and it's not worth keeping track of all the different bugs. * time/mktime.c (__EXTENSIONS__): Remove. (<unistd.h>): No need to include. * time/strftime.c: Likewise. * time/mktime.c (_POSIX_THREAD_SAFE_FUNCTIONS, HAVE_LOCALTIME_R): Remove. (my_mktime_localtime_r): Renamed from localtime_r; all uses changed. Base it on localtime unless _LIBC. * time/strftime.c (my_strftime_gmtime_r): Renamed from gmtime_r; all uses changed. (my_strftime_localtime_r): Renamed from localtime_r; all uses changed. Base them on localtime/gmtime if not _LIBC. 1998-11-07 Ulrich Drepper <drepper@cygnus.com> * sysdeps/generic/isastream.c: Always return 0 unless it is an invalid file descriptor. This makes this function actually usable. Proposed by Mark Kettenis <kettenis@phys.uva.nl>.
1998-11-08 11:40:28 +01:00
/* 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;
}
fp->_IO_file_flags |= old_error;
return result;
}
Update. 2002-08-04 Jakub Jelinek <jakub@redhat.com> * manual/debug.texi: Fix spelling to programmatically. Reported by <hayastan132@hotmail.com>. * include/libio.h: Add libc_hidden_proto for __uflow. * include/stdio.h: Map fopen, fdopen, fclose, fputs, fsetpos, and fgetpos to _IO_* names. Add libc_hidden_proto for fileno, fwrite, fseek, fflush_unlocked, fread_unlocked, fwrite_unlocked, fgets_unlocked, fputs_unlocked. * include/wchar.h: Add libc_hidden_proto for fputws_unlocked, putwc_unlocked, vswscanf. * libio/iolibio.h: Add libc_hidden_proto for _IO_fputs. * libio/fileno.c: Use <stdio.h> and libc_hidden_def. * libio/fseek.c: Likewise. * libio/fmemopen.c: Include "libioP.h". Call _IO_fopencookie and not fopencookie. * libio/genops.c (__uflow): Add libc_hidden_def. * libio/iofflush_u.c (fflush_unlocked): Likewise. * libio/iofgets_u.c (fgets_unlocked): Likewise. * libio/iofputs_u.c (fputs_unlocked): Likewise. * libio/iofputws_u.c (fputws_unlocked): Likewise. * libio/iofread_u.c (fread_unlocked): Likewise. * libio/iofwrite_u.c (fwrite_unlocked): Likewise. * libio/iovswscanf.c (vswscanf): Likewise. * libio/putwc_u.c (putwc_unlocked): Likewise. * libio/iofputs.c: Use libc_hidden_def instead of INTDEF. * malloc/malloc.c: Redirect fwrite calls to _IO_fwrite. * malloc/mtrace.c: Likewise. * sunrpc/clnt_perr.c: Remove fputs macro. * sunrpc/svc_simple.c: Likewise. * sunrpc/svc_tcp.c: Likewise. * sunrpc/svc_udp.c: Likewise. * sunrpc/xdr_rec.c: Likewise. * sunrpc/xdr_ref.c: Likewise. * iconv/Makefile: Add CPPFLAGS definitions with -DNOT_in_libc for iconv_prog, linereader, and charmap-dir. * locale/Makefile: Likewise for locale and charmap-dir. * malloc/Makefile: Likewise for memusagestat. * nscd/Makefile: Likewise for nscd, nscd_conf, and dbg_log. * sunrpc/Makefile: Likewise for rpc_main. * sysdeps/unix/sysv/linux/Makefile: Likewise for lddlibc4. * timezone/Makefile: Likewise for zic. * stdio-common/perror.c: Avoid multiple calls to fileno_unlocked.
2002-08-04 22:54:20 +02:00
libc_hidden_def (fgets_unlocked)