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182 lines
5.8 KiB
C
182 lines
5.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* *printf implementations for busybox
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*
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* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/* Mar 12, 2003 Manuel Novoa III
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*
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* While fwrite(), fputc(), fputs(), etc. all set the stream error flag
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* on failure, the *printf functions are unique in that they can fail
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* for reasons not related to the actual output itself. Among the possible
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* reasons for failure which don't set the streams error indicator,
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* SUSv3 lists EILSEQ, EINVAL, and ENOMEM.
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*
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* In some cases, it would be desirable to have a group of *printf()
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* functions available that _always_ set the stream error indicator on
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* failure. That would allow us to defer error checking until applet
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* exit. Unfortunately, there is no standard way of setting a streams
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* error indicator... even though we can clear it with clearerr().
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*
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* Therefore, we have to resort to implementation dependent code. Feel
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* free to send patches for stdio implementations where the following
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* fails.
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*
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* NOTE: None of this is thread safe. As busybox is a non-threaded app,
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* that isn't currently an issue.
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include "libbb.h"
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#if defined(__UCLIBC__)
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# if defined(__FLAG_ERROR)
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/* Using my newer stdio implementation. Unlocked macros are:
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* #define __CLEARERR(stream) \
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((stream)->modeflags &= ~(__FLAG_EOF|__FLAG_ERROR), (void)0)
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* #define __FEOF(stream) ((stream)->modeflags & __FLAG_EOF)
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* #define __FERROR(stream) ((stream)->modeflags & __FLAG_ERROR)
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*/
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# if defined(__MASK_READING)
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# define SET_FERROR_UNLOCKED(S) ((S)->__modeflags |= __FLAG_ERROR)
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# else
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# define SET_FERROR_UNLOCKED(S) ((S)->modeflags |= __FLAG_ERROR)
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# endif
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# elif defined(__MODE_ERR)
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/* Using either the original stdio implementation (from dev86) or
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* my original stdio rewrite. Macros were:
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* #define ferror(fp) (((fp)->mode&__MODE_ERR) != 0)
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* #define feof(fp) (((fp)->mode&__MODE_EOF) != 0)
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* #define clearerr(fp) ((fp)->mode &= ~(__MODE_EOF|__MODE_ERR),0)
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*/
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#define SET_FERROR_UNLOCKED(S) ((S)->mode |= __MODE_ERR)
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# else
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# error unknown uClibc stdio implemenation!
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# endif
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#elif defined(__NEWLIB_H__)
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/* I honestly don't know if there are different versions of stdio in
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* newlibs history. Anyway, here's what's current.
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* #define __sfeof(p) (((p)->_flags & __SEOF) != 0)
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* #define __sferror(p) (((p)->_flags & __SERR) != 0)
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* #define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF)))
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*/
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# define SET_FERROR_UNLOCKED(S) ((S)->_flags |= __SERR)
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#elif defined(__GLIBC__)
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# if defined(_STDIO_USES_IOSTREAM)
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/* Apparently using the newer libio implementation, with associated defines:
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* #define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
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* #define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)
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*/
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# define SET_FERROR_UNLOCKED(S) ((S)->_flags |= _IO_ERR_SEEN)
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# else
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/* Assume the older version of glibc which used a bitfield entry
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* as a stream error flag. The associated defines were:
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* #define __clearerr(stream) ((stream)->__error = (stream)->__eof = 0)
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* #define feof_unlocked(stream) ((stream)->__eof != 0)
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* #define ferror_unlocked(stream) ((stream)->__error != 0)
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*/
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# define SET_FERROR_UNLOCKED(S) ((S)->__error = 1)
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# endif
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#elif defined(__dietlibc__)
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/*
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* WARNING!!! dietlibc is quite buggy. WARNING!!!
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*
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* Some example bugs as of March 12, 2003...
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* 1) fputc() doesn't set the error indicator on failure.
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* 2) freopen() doesn't maintain the same stream object, contrary to
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* standards. This makes it useless in its primary role of
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* reassociating stdin/stdout/stderr.
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* 3) printf() often fails to correctly format output when conversions
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* involve padding. It is also practically useless for floating
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* point output.
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*
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* But, if you're determined to use it anyway, (as of the current version)
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* you can extract the information you need from dietstdio.h. See the
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* other library implementations for examples.
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*/
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# error dietlibc is currently not supported. Please see the commented source.
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#else /* some other lib */
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/* Please see the comments for the above supported libraries for examples
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* of what is required to support your stdio implementation.
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*/
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# error Your stdio library is currently not supported. Please see the commented source.
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#endif
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#ifdef L_bb_vfprintf
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extern int bb_vfprintf(FILE * __restrict stream,
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const char * __restrict format,
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va_list arg)
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{
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int rv;
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if ((rv = vfprintf(stream, format, arg)) < 0) {
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SET_FERROR_UNLOCKED(stream);
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}
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return rv;
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}
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#endif
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#ifdef L_bb_vprintf
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extern int bb_vprintf(const char * __restrict format, va_list arg)
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{
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return bb_vfprintf(stdout, format, arg);
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}
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#endif
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#ifdef L_bb_fprintf
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extern int bb_fprintf(FILE * __restrict stream,
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const char * __restrict format, ...)
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{
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va_list arg;
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int rv;
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va_start(arg, format);
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rv = bb_vfprintf(stream, format, arg);
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va_end(arg);
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return rv;
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}
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#endif
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#ifdef L_bb_printf
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extern int bb_printf(const char * __restrict format, ...)
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{
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va_list arg;
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int rv;
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va_start(arg, format);
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rv = bb_vfprintf(stdout, format, arg);
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va_end(arg);
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return rv;
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}
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#endif
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