busybox

/* vi: set sw=4 ts=4: */

/*

 * *printf implementations for busybox

 *

 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>

 *

 * 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 2 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, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

 *

 */

​

/* Mar 12, 2003     Manuel Novoa III

 *

 * While fwrite(), fputc(), fputs(), etc. all set the stream error flag

 * on failure, the *printf functions are unique in that they can fail

 * for reasons not related to the actual output itself.  Among the possible

 * reasons for failure which don't set the streams error indicator,

 * SUSv3 lists EILSEQ, EINVAL, and ENOMEM.

 *

 * In some cases, it would be desirable to have a group of *printf()

 * functions available that _always_ set the stream error indicator on

 * failure.  That would allow us to defer error checking until applet

 * exit.  Unfortunately, there is no standard way of setting a streams

 * error indicator... even though we can clear it with clearerr().

 *

 * Therefore, we have to resort to implementation dependent code.  Feel

 * free to send patches for stdio implementations where the following

 * fails.

 *

 * NOTE: None of this is thread safe.  As busybox is a non-threaded app,

 *       that isn't currently an issue.

 */

​

#include <stdio.h>

#include <stdarg.h>

#include "libbb.h"

​

#if defined(__UCLIBC__)

​

# if defined(__FLAG_ERROR)

/* Using my newer stdio implementation.  Unlocked macros are:

 * #define __CLEARERR(stream) \

      ((stream)->modeflags &= ~(__FLAG_EOF|__FLAG_ERROR), (void)0)

 * #define __FEOF(stream)       ((stream)->modeflags & __FLAG_EOF)

 * #define __FERROR(stream) ((stream)->modeflags & __FLAG_ERROR)

 */

#  if defined(__MASK_READING)

#   define SET_FERROR_UNLOCKED(S)    ((S)->__modeflags |= __FLAG_ERROR)

#  else

#   define SET_FERROR_UNLOCKED(S)    ((S)->modeflags |= __FLAG_ERROR)

#  endif

​