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1/* vi: set sw=4 ts=4: */
2/*
3 * *printf implementations for busybox
4 *
5 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23/* Mar 12, 2003 Manuel Novoa III
24 *
25 * While fwrite(), fputc(), fputs(), etc. all set the stream error flag
26 * on failure, the *printf functions are unique in that they can fail
27 * for reasons not related to the actual output itself. Among the possible
28 * reasons for failure which don't set the streams error indicator,
29 * SUSv3 lists EILSEQ, EINVAL, and ENOMEM.
30 *
31 * In some cases, it would be desireable to have a group of *printf()
32 * functions available that _always_ set the stream error indicator on
33 * failure. That would allow us to defer error checking until applet
34 * exit. Unfortunately, there is no standard way of setting a streams
35 * error indicator... even though we can clear it with clearerr().
36 *
37 * Therefore, we have to resort to implementation dependent code. Feel
38 * free to send patches for stdio implementations where the following
39 * fails.
40 *
41 * NOTE: None of this is threadsafe. As busybox is a nonthreaded app,
42 * that isn't currently an issue.
43 */
44
45#include <stdio.h>
46#include <stdarg.h>
47#include "libbb.h"
48
49#if defined(__UCLIBC__)
50
51# if defined(__FLAG_ERROR)
52/* Using my newer stdio implementation. Unlocked macros are:
53 * #define __CLEARERR(stream) \
54 ((stream)->modeflags &= ~(__FLAG_EOF|__FLAG_ERROR), (void)0)
55 * #define __FEOF(stream) ((stream)->modeflags & __FLAG_EOF)
56 * #define __FERROR(stream) ((stream)->modeflags & __FLAG_ERROR)
57 */
58#define SET_FERROR_UNLOCKED(S) ((S)->modeflags |= __FLAG_ERROR)
59
60#elif defined(__MODE_ERR)
61/* Using either the original stdio implementation (from dev86) or
62 * my original stdio rewrite. Macros were:
63 * #define ferror(fp) (((fp)->mode&__MODE_ERR) != 0)
64 * #define feof(fp) (((fp)->mode&__MODE_EOF) != 0)
65 * #define clearerr(fp) ((fp)->mode &= ~(__MODE_EOF|__MODE_ERR),0)
66 */
67#define SET_FERROR_UNLOCKED(S) ((S)->mode |= __MODE_ERR)
68
69#else
70#error unknown uClibc stdio implemenation!
71#endif
72
73#elif defined(__GLIBC__)
74
75# if defined(_STDIO_USES_IOSTREAM)
76/* Apparently using the newer libio implementation, with associated defines:
77 * #define _IO_feof_unlocked(__fp) (((__fp)->_flags & _IO_EOF_SEEN) != 0)
78 * #define _IO_ferror_unlocked(__fp) (((__fp)->_flags & _IO_ERR_SEEN) != 0)
79 */
80#define SET_FERROR_UNLOCKED(S) ((S)->_flags |= _IO_ERR_SEEN)
81
82# else
83/* Assume the older version of glibc which used a bitfield entry
84 * as a stream error flag. The associated defines were:
85 * #define __clearerr(stream) ((stream)->__error = (stream)->__eof = 0)
86 * #define feof_unlocked(stream) ((stream)->__eof != 0)
87 * #define ferror_unlocked(stream) ((stream)->__error != 0)
88 */
89#define SET_FERROR_UNLOCKED(S) ((S)->__error = 1)
90
91# endif
92
93#elif defined(__NEWLIB_H__)
94/* I honestly don't know if there are different versions of stdio in
95 * newlibs history. Anyway, here's what's current.
96 * #define __sfeof(p) (((p)->_flags & __SEOF) != 0)
97 * #define __sferror(p) (((p)->_flags & __SERR) != 0)
98 * #define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF)))
99 */
100#define SET_FERROR_UNLOCKED(S) ((S)->_flags |= __SERR)
101
102#elif defined(__dietlibc__)
103/*
104 * WARNING!!! dietlibc is quite buggy. WARNING!!!
105 *
106 * Some example bugs as of March 12, 2003...
107 * 1) fputc() doesn't set the error indicator on failure.
108 * 2) freopen() doesn't maintain the same stream object, contary to
109 * standards. This makes it useless in its primary role of
110 * reassociating stdin/stdout/stderr.
111 * 3) printf() often fails to correctly format output when conversions
112 * involve padding. It is also practically useless for floating
113 * point output.
114 *
115 * But, if you're determined to use it anyway, (as of the current version)
116 * you can extract the information you need from dietstdio.h. See the
117 * other library implementations for examples.
118 */
119#error dietlibc is currently not supported. Please see the commented source.
120
121#else /* some other lib */
122/* Please see the comments for the above supported libaries for examples
123 * of what is required to support your stdio implementation.
124 */
125#error Your stdio library is currently not supported. Please see the commented source.
126#endif
127
128#ifdef L_vfprintf
129extern int bb_vfprintf(FILE * __restrict stream,
130 const char * __restrict format,
131 va_list arg)
132{
133 int rv;
134
135 if ((rv = vfprintf(stream, format, arg)) < 0) {
136 SET_FERROR_UNLOCKED(stream);
137 }
138
139 return rv;
140}
141#endif
142
143#ifdef L_vprintf
144extern int bb_vprintf(const char * __restrict format, va_list arg)
145{
146 return bb_vfprintf(stdout, format, arg);
147}
148#endif
149
150#ifdef L_fprintf
151extern int bb_fprintf(FILE * __restrict stream,
152 const char * __restrict format, ...)
153{
154 va_list arg;
155 int rv;
156
157 va_start(arg, format);
158 rv = bb_vfprintf(stream, format, arg);
159 va_end(arg);
160
161 return rv;
162}
163#endif
164
165#ifdef L_printf
166extern int bb_printf(const char * __restrict format, ...)
167{
168 va_list arg;
169 int rv;
170
171 va_start(arg, format);
172 rv = bb_vfprintf(stdout, format, arg);
173 va_end(arg);
174
175 return rv;
176}
177#endif
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