2 * Copyright (c) 1995-2003 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
55 struct snprintf_state {
58 unsigned char *theend;
61 void (*append_char)(struct snprintf_state *, unsigned char);
65 #if !defined(HAVE_VSNPRINTF) || defined(TEST_SNPRINTF)
67 sn_reserve (struct snprintf_state *state, size_t n)
69 return state->s + n > state->theend;
73 sn_append_char (struct snprintf_state *state, unsigned char c)
75 if (!sn_reserve (state, 1))
81 as_reserve (struct snprintf_state *state, size_t n)
83 if (state->s + n > state->theend) {
84 int off = state->s - state->str;
87 if (state->max_sz && state->sz >= state->max_sz)
90 state->sz = max(state->sz * 2, state->sz + n);
92 state->sz = min(state->sz, state->max_sz);
93 tmp = realloc (state->str, state->sz);
97 state->s = state->str + off;
98 state->theend = state->str + state->sz - 1;
104 as_append_char (struct snprintf_state *state, unsigned char c)
106 if(!as_reserve (state, 1))
110 /* longest integer types */
112 #ifdef HAVE_LONG_LONG
113 typedef unsigned long long u_longest;
114 typedef long long longest;
116 typedef unsigned long u_longest;
117 typedef long longest;
120 #ifndef HAVE_UINTPTR_T
121 typedef u_longest uintptr_t;
127 pad(struct snprintf_state *state, int width, char c)
131 (*state->append_char)(state, c);
137 /* return true if we should use alternatve hex form */
139 use_alternative (int flags, u_longest num, unsigned base)
141 return (flags & alternate_flag) && base == 16 && num != 0;
145 append_number(struct snprintf_state *state,
146 u_longest num, unsigned base, const char *rep,
147 int width, int prec, int flags, int minusp)
151 char nstr[64]; /* enough for <192 bit octal integers */
155 /* given precision, ignore zero flag */
161 /* format number as string */
162 nstart = sizeof(nstr);
164 nstr[--nstart] = '\0';
167 nstr[--nstart] = rep[n % base];
172 /* zero value with zero precision should produce no digits */
173 if(prec == 0 && num == 0) {
178 /* figure out what char to use for sign */
181 else if((flags & plus_flag))
183 else if((flags & space_flag))
188 if((flags & alternate_flag) && base == 8) {
189 /* if necessary, increase the precision to
190 make first digit a zero */
192 /* XXX C99 claims (regarding # and %o) that "if the value and
193 precision are both 0, a single 0 is printed", but there is
194 no such wording for %x. This would mean that %#.o would
195 output "0", but %#.x "". This does not make sense, and is
196 also not what other printf implementations are doing. */
198 if(prec <= nlen && nstr[nstart] != '0' && nstr[nstart] != '\0')
203 pad | sign | alt | zero | digits
204 sign | alt | zero | digits | pad minus_flag
205 sign | alt | zero | digits zero_flag */
207 /* if not right justifying or padding with zeros, we need to
208 compute the length of the rest of the string, and then pad with
210 if(!(flags & (minus_flag | zero_flag))) {
216 if(use_alternative(flags, num, base))
223 len += pad(state, width, ' ');
225 if(signchar != '\0') {
226 (*state->append_char)(state, signchar);
229 if(use_alternative(flags, num, base)) {
230 (*state->append_char)(state, '0');
231 (*state->append_char)(state, rep[10] + 23); /* XXX */
234 if(flags & zero_flag) {
235 /* pad to width with zeros */
236 if(prec - nlen > width - len - nlen)
237 len += pad(state, prec - nlen, '0');
239 len += pad(state, width - len - nlen, '0');
241 /* pad to prec with zeros */
242 len += pad(state, prec - nlen, '0');
244 while(nstr[nstart] != '\0') {
245 (*state->append_char)(state, nstr[nstart++]);
249 if(flags & minus_flag)
250 len += pad(state, width - len, ' ');
260 append_string (struct snprintf_state *state,
261 const unsigned char *arg,
269 arg = (const unsigned char*)"(null)";
274 width -= strlen((const char *)arg);
275 if(!(flags & minus_flag))
276 len += pad(state, width, ' ');
279 while (*arg && prec--) {
280 (*state->append_char) (state, *arg++);
285 (*state->append_char) (state, *arg++);
289 if(flags & minus_flag)
290 len += pad(state, width, ' ');
295 append_char(struct snprintf_state *state,
302 while(!(flags & minus_flag) && --width > 0) {
303 (*state->append_char) (state, ' ') ;
306 (*state->append_char) (state, arg);
308 while((flags & minus_flag) && --width > 0) {
309 (*state->append_char) (state, ' ');
316 * This can't be made into a function...
319 #ifdef HAVE_LONG_LONG
321 #define PARSE_INT_FORMAT(res, arg, unsig) \
322 if (long_long_flag) \
323 res = (unsig long long)va_arg(arg, unsig long long); \
324 else if (long_flag) \
325 res = (unsig long)va_arg(arg, unsig long); \
326 else if (size_t_flag) \
327 res = (unsig long)va_arg(arg, size_t); \
328 else if (short_flag) \
329 res = (unsig short)va_arg(arg, unsig int); \
331 res = (unsig int)va_arg(arg, unsig int)
335 #define PARSE_INT_FORMAT(res, arg, unsig) \
337 res = (unsig long)va_arg(arg, unsig long); \
338 else if (size_t_flag) \
339 res = (unsig long)va_arg(arg, size_t); \
340 else if (short_flag) \
341 res = (unsig short)va_arg(arg, unsig int); \
343 res = (unsig int)va_arg(arg, unsig int)
348 * zyxprintf - return length, as snprintf
352 xyzprintf (struct snprintf_state *state, const char *char_format, va_list ap)
354 const unsigned char *format = (const unsigned char *)char_format;
358 while((c = *format++)) {
364 int long_long_flag = 0;
369 while((c = *format++)){
377 flags |= alternate_flag;
386 if((flags & space_flag) && (flags & plus_flag))
389 if((flags & minus_flag) && (flags & zero_flag))
395 width = width * 10 + c - '0';
399 width = va_arg(ap, int);
409 prec = prec * 10 + c - '0';
413 prec = va_arg(ap, int);
423 } else if (c == 'z') {
426 } else if (c == 'l') {
435 if(c != 'd' && c != 'i')
436 flags &= ~(plus_flag | space_flag);
440 append_char(state, va_arg(ap, int), width, flags);
444 len += append_string(state,
445 va_arg(ap, unsigned char*),
456 PARSE_INT_FORMAT(arg, ap, signed);
464 len += append_number (state, num, 10, "0123456789",
465 width, prec, flags, minusp);
471 PARSE_INT_FORMAT(arg, ap, unsigned);
473 len += append_number (state, arg, 10, "0123456789",
474 width, prec, flags, 0);
480 PARSE_INT_FORMAT(arg, ap, unsigned);
482 len += append_number (state, arg, 010, "01234567",
483 width, prec, flags, 0);
489 PARSE_INT_FORMAT(arg, ap, unsigned);
491 len += append_number (state, arg, 0x10, "0123456789abcdef",
492 width, prec, flags, 0);
498 PARSE_INT_FORMAT(arg, ap, unsigned);
500 len += append_number (state, arg, 0x10, "0123456789ABCDEF",
501 width, prec, flags, 0);
505 uintptr_t arg = (uintptr_t)va_arg(ap, void*);
507 len += append_number (state, arg, 0x10, "0123456789ABCDEF",
508 width, prec, flags, 0);
512 int *arg = va_arg(ap, int*);
513 *arg = state->s - state->str;
520 (*state->append_char)(state, c);
524 (*state->append_char)(state, '%');
525 (*state->append_char)(state, c);
530 (*state->append_char) (state, c);
537 #if !defined(HAVE_SNPRINTF) || defined(TEST_SNPRINTF)
538 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
539 rk_snprintf (char *str, size_t sz, const char *format, ...)
544 va_start(args, format);
545 ret = vsnprintf (str, sz, format, args);
557 va_start(args, format);
558 ret2 = vsprintf (tmp, format, args);
560 if (ret != ret2 || strcmp(str, tmp))
570 #if !defined(HAVE_ASPRINTF) || defined(TEST_SNPRINTF)
571 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
572 rk_asprintf (char **ret, const char *format, ...)
577 va_start(args, format);
578 val = vasprintf (ret, format, args);
585 tmp = malloc (val + 1);
589 va_start(args, format);
590 ret2 = vsprintf (tmp, format, args);
592 if (val != ret2 || strcmp(*ret, tmp))
602 #if !defined(HAVE_ASNPRINTF) || defined(TEST_SNPRINTF)
603 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
604 rk_asnprintf (char **ret, size_t max_sz, const char *format, ...)
609 va_start(args, format);
610 val = vasnprintf (ret, max_sz, format, args);
616 tmp = malloc (val + 1);
620 ret2 = vsprintf (tmp, format, args);
621 if (val != ret2 || strcmp(*ret, tmp))
632 #if !defined(HAVE_VASPRINTF) || defined(TEST_SNPRINTF)
633 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
634 rk_vasprintf (char **ret, const char *format, va_list args)
636 return vasnprintf (ret, 0, format, args);
641 #if !defined(HAVE_VASNPRINTF) || defined(TEST_SNPRINTF)
642 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
643 rk_vasnprintf (char **ret, size_t max_sz, const char *format, va_list args)
646 struct snprintf_state state;
648 state.max_sz = max_sz;
650 state.str = malloc(state.sz);
651 if (state.str == NULL) {
656 state.theend = state.s + state.sz - 1;
657 state.append_char = as_append_char;
659 st = xyzprintf (&state, format, args);
668 tmp = realloc (state.str, st+1);
680 #if !defined(HAVE_VSNPRINTF) || defined(TEST_SNPRINTF)
681 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
682 rk_vsnprintf (char *str, size_t sz, const char *format, va_list args)
684 struct snprintf_state state;
686 unsigned char *ustr = (unsigned char *)str;
692 state.theend = ustr + sz - (sz > 0);
693 state.append_char = sn_append_char;
695 ret = xyzprintf (&state, format, args);
696 if (state.s != NULL && sz != 0)