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Diffstat (limited to 'release/src/router/busybox/libbb/printf.c')
| -rw-r--r-- | release/src/router/busybox/libbb/printf.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/release/src/router/busybox/libbb/printf.c b/release/src/router/busybox/libbb/printf.c new file mode 100644 index 00000000..923c5a1a --- /dev/null +++ b/release/src/router/busybox/libbb/printf.c @@ -0,0 +1,177 @@ +/* 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 desireable 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 threadsafe. As busybox is a nonthreaded 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) + */ +#define SET_FERROR_UNLOCKED(S) ((S)->modeflags |= __FLAG_ERROR) + +#elif defined(__MODE_ERR) +/* Using either the original stdio implementation (from dev86) or + * my original stdio rewrite. Macros were: + * #define ferror(fp) (((fp)->mode&__MODE_ERR) != 0) + * #define feof(fp) (((fp)->mode&__MODE_EOF) != 0) + * #define clearerr(fp) ((fp)->mode &= ~(__MODE_EOF|__MODE_ERR),0) + */ +#define SET_FERROR_UNLOCKED(S) ((S)->mode |= __MODE_ERR) + +#else +#error unknown uClibc stdio implemenation! +#endif + +#elif defined(__GLIBC__) + +# if defined(_STDIO_USES_IOSTREAM) +/* Apparently using the newer libio implementation, with associated defines: + * #define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0) + * #define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0) + */ +#define SET_FERROR_UNLOCKED(S) ((S)->_flags |= _IO_ERR_SEEN) + +# else +/* Assume the older version of glibc which used a bitfield entry + * as a stream error flag. The associated defines were: + * #define __clearerr(stream) ((stream)->__error = (stream)->__eof = 0) + * #define feof_unlocked(stream) ((stream)->__eof != 0) + * #define ferror_unlocked(stream) ((stream)->__error != 0) + */ +#define SET_FERROR_UNLOCKED(S) ((S)->__error = 1) + +# endif + +#elif defined(__NEWLIB_H__) +/* I honestly don't know if there are different versions of stdio in + * newlibs history. Anyway, here's what's current. + * #define __sfeof(p) (((p)->_flags & __SEOF) != 0) + * #define __sferror(p) (((p)->_flags & __SERR) != 0) + * #define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF))) + */ +#define SET_FERROR_UNLOCKED(S) ((S)->_flags |= __SERR) + +#elif defined(__dietlibc__) +/* + * WARNING!!! dietlibc is quite buggy. WARNING!!! + * + * Some example bugs as of March 12, 2003... + * 1) fputc() doesn't set the error indicator on failure. + * 2) freopen() doesn't maintain the same stream object, contary to + * standards. This makes it useless in its primary role of + * reassociating stdin/stdout/stderr. + * 3) printf() often fails to correctly format output when conversions + * involve padding. It is also practically useless for floating + * point output. + * + * But, if you're determined to use it anyway, (as of the current version) + * you can extract the information you need from dietstdio.h. See the + * other library implementations for examples. + */ +#error dietlibc is currently not supported. Please see the commented source. + +#else /* some other lib */ +/* Please see the comments for the above supported libaries for examples + * of what is required to support your stdio implementation. + */ +#error Your stdio library is currently not supported. Please see the commented source. +#endif + +#ifdef L_bb_vfprintf +extern int bb_vfprintf(FILE * __restrict stream, + const char * __restrict format, + va_list arg) +{ + int rv; + + if ((rv = vfprintf(stream, format, arg)) < 0) { + SET_FERROR_UNLOCKED(stream); + } + + return rv; +} +#endif + +#ifdef L_bb_vprintf +extern int bb_vprintf(const char * __restrict format, va_list arg) +{ + return bb_vfprintf(stdout, format, arg); +} +#endif + +#ifdef L_bb_fprintf +extern int bb_fprintf(FILE * __restrict stream, + const char * __restrict format, ...) +{ + va_list arg; + int rv; + + va_start(arg, format); + rv = bb_vfprintf(stream, format, arg); + va_end(arg); + + return rv; +} +#endif + +#ifdef L_bb_printf +extern int bb_printf(const char * __restrict format, ...) +{ + va_list arg; + int rv; + + va_start(arg, format); + rv = bb_vfprintf(stdout, format, arg); + va_end(arg); + + return rv; +} +#endif |