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3 * (Royal Institute of Technology, Stockholm, Sweden).
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36 RCSID("$Id: snprintf.c 21005 2007-06-08 01:54:35Z lha $");
38 #if defined(TEST_SNPRINTF)
39 #include "snprintf-test.h"
40 #endif /* TEST_SNPRINTF */
61 struct snprintf_state {
64 unsigned char *theend;
67 void (*append_char)(struct snprintf_state *, unsigned char);
71 #if !defined(HAVE_VSNPRINTF) || defined(TEST_SNPRINTF)
73 sn_reserve (struct snprintf_state *state, size_t n)
75 return state->s + n > state->theend;
79 sn_append_char (struct snprintf_state *state, unsigned char c)
81 if (!sn_reserve (state, 1))
87 as_reserve (struct snprintf_state *state, size_t n)
89 if (state->s + n > state->theend) {
90 int off = state->s - state->str;
93 if (state->max_sz && state->sz >= state->max_sz)
96 state->sz = max(state->sz * 2, state->sz + n);
98 state->sz = min(state->sz, state->max_sz);
99 tmp = realloc (state->str, state->sz);
103 state->s = state->str + off;
104 state->theend = state->str + state->sz - 1;
110 as_append_char (struct snprintf_state *state, unsigned char c)
112 if(!as_reserve (state, 1))
116 /* longest integer types */
118 #ifdef HAVE_LONG_LONG
119 typedef unsigned long long u_longest;
120 typedef long long longest;
122 typedef unsigned long u_longest;
123 typedef long longest;
129 pad(struct snprintf_state *state, int width, char c)
133 (*state->append_char)(state, c);
139 /* return true if we should use alternatve hex form */
141 use_alternative (int flags, u_longest num, unsigned base)
143 return (flags & alternate_flag) && base == 16 && num != 0;
147 append_number(struct snprintf_state *state,
148 u_longest num, unsigned base, const char *rep,
149 int width, int prec, int flags, int minusp)
153 char nstr[64]; /* enough for <192 bit octal integers */
157 /* given precision, ignore zero flag */
163 /* format number as string */
164 nstart = sizeof(nstr);
166 nstr[--nstart] = '\0';
169 nstr[--nstart] = rep[n % base];
174 /* zero value with zero precision should produce no digits */
175 if(prec == 0 && num == 0) {
180 /* figure out what char to use for sign */
183 else if((flags & plus_flag))
185 else if((flags & space_flag))
190 if((flags & alternate_flag) && base == 8) {
191 /* if necessary, increase the precision to
192 make first digit a zero */
194 /* XXX C99 claims (regarding # and %o) that "if the value and
195 precision are both 0, a single 0 is printed", but there is
196 no such wording for %x. This would mean that %#.o would
197 output "0", but %#.x "". This does not make sense, and is
198 also not what other printf implementations are doing. */
200 if(prec <= nlen && nstr[nstart] != '0' && nstr[nstart] != '\0')
205 pad | sign | alt | zero | digits
206 sign | alt | zero | digits | pad minus_flag
207 sign | alt | zero | digits zero_flag */
209 /* if not right justifying or padding with zeros, we need to
210 compute the length of the rest of the string, and then pad with
212 if(!(flags & (minus_flag | zero_flag))) {
218 if(use_alternative(flags, num, base))
225 len += pad(state, width, ' ');
227 if(signchar != '\0') {
228 (*state->append_char)(state, signchar);
231 if(use_alternative(flags, num, base)) {
232 (*state->append_char)(state, '0');
233 (*state->append_char)(state, rep[10] + 23); /* XXX */
236 if(flags & zero_flag) {
237 /* pad to width with zeros */
238 if(prec - nlen > width - len - nlen)
239 len += pad(state, prec - nlen, '0');
241 len += pad(state, width - len - nlen, '0');
243 /* pad to prec with zeros */
244 len += pad(state, prec - nlen, '0');
246 while(nstr[nstart] != '\0') {
247 (*state->append_char)(state, nstr[nstart++]);
251 if(flags & minus_flag)
252 len += pad(state, width - len, ' ');
262 append_string (struct snprintf_state *state,
263 const unsigned char *arg,
271 arg = (const unsigned char*)"(null)";
276 width -= strlen((const char *)arg);
277 if(!(flags & minus_flag))
278 len += pad(state, width, ' ');
281 while (*arg && prec--) {
282 (*state->append_char) (state, *arg++);
287 (*state->append_char) (state, *arg++);
291 if(flags & minus_flag)
292 len += pad(state, width, ' ');
297 append_char(struct snprintf_state *state,
304 while(!(flags & minus_flag) && --width > 0) {
305 (*state->append_char) (state, ' ') ;
308 (*state->append_char) (state, arg);
310 while((flags & minus_flag) && --width > 0) {
311 (*state->append_char) (state, ' ');
318 * This can't be made into a function...
321 #ifdef HAVE_LONG_LONG
323 #define PARSE_INT_FORMAT(res, arg, unsig) \
324 if (long_long_flag) \
325 res = (unsig long long)va_arg(arg, unsig long long); \
326 else if (long_flag) \
327 res = (unsig long)va_arg(arg, unsig long); \
328 else if (size_t_flag) \
329 res = (unsig long)va_arg(arg, size_t); \
330 else if (short_flag) \
331 res = (unsig short)va_arg(arg, unsig int); \
333 res = (unsig int)va_arg(arg, unsig int)
337 #define PARSE_INT_FORMAT(res, arg, unsig) \
339 res = (unsig long)va_arg(arg, unsig long); \
340 else if (size_t_flag) \
341 res = (unsig long)va_arg(arg, size_t); \
342 else if (short_flag) \
343 res = (unsig short)va_arg(arg, unsig int); \
345 res = (unsig int)va_arg(arg, unsig int)
350 * zyxprintf - return length, as snprintf
354 xyzprintf (struct snprintf_state *state, const char *char_format, va_list ap)
356 const unsigned char *format = (const unsigned char *)char_format;
360 while((c = *format++)) {
366 int long_long_flag = 0;
371 while((c = *format++)){
379 flags |= alternate_flag;
388 if((flags & space_flag) && (flags & plus_flag))
391 if((flags & minus_flag) && (flags & zero_flag))
397 width = width * 10 + c - '0';
401 width = va_arg(ap, int);
411 prec = prec * 10 + c - '0';
415 prec = va_arg(ap, int);
425 } else if (c == 'z') {
428 } else if (c == 'l') {
437 if(c != 'd' && c != 'i')
438 flags &= ~(plus_flag | space_flag);
442 append_char(state, va_arg(ap, int), width, flags);
446 len += append_string(state,
447 va_arg(ap, unsigned char*),
458 PARSE_INT_FORMAT(arg, ap, signed);
466 len += append_number (state, num, 10, "0123456789",
467 width, prec, flags, minusp);
473 PARSE_INT_FORMAT(arg, ap, unsigned);
475 len += append_number (state, arg, 10, "0123456789",
476 width, prec, flags, 0);
482 PARSE_INT_FORMAT(arg, ap, unsigned);
484 len += append_number (state, arg, 010, "01234567",
485 width, prec, flags, 0);
491 PARSE_INT_FORMAT(arg, ap, unsigned);
493 len += append_number (state, arg, 0x10, "0123456789abcdef",
494 width, prec, flags, 0);
500 PARSE_INT_FORMAT(arg, ap, unsigned);
502 len += append_number (state, arg, 0x10, "0123456789ABCDEF",
503 width, prec, flags, 0);
507 unsigned long arg = (unsigned long)va_arg(ap, void*);
509 len += append_number (state, arg, 0x10, "0123456789ABCDEF",
510 width, prec, flags, 0);
514 int *arg = va_arg(ap, int*);
515 *arg = state->s - state->str;
522 (*state->append_char)(state, c);
526 (*state->append_char)(state, '%');
527 (*state->append_char)(state, c);
532 (*state->append_char) (state, c);
539 #if !defined(HAVE_SNPRINTF) || defined(TEST_SNPRINTF)
540 int ROKEN_LIB_FUNCTION
541 snprintf (char *str, size_t sz, const char *format, ...)
546 va_start(args, format);
547 ret = vsnprintf (str, sz, format, args);
559 va_start(args, format);
560 ret2 = vsprintf (tmp, format, args);
562 if (ret != ret2 || strcmp(str, tmp))
572 #if !defined(HAVE_ASPRINTF) || defined(TEST_SNPRINTF)
573 int ROKEN_LIB_FUNCTION
574 asprintf (char **ret, const char *format, ...)
579 va_start(args, format);
580 val = vasprintf (ret, format, args);
587 tmp = malloc (val + 1);
591 va_start(args, format);
592 ret2 = vsprintf (tmp, format, args);
594 if (val != ret2 || strcmp(*ret, tmp))
604 #if !defined(HAVE_ASNPRINTF) || defined(TEST_SNPRINTF)
605 int ROKEN_LIB_FUNCTION
606 asnprintf (char **ret, size_t max_sz, const char *format, ...)
611 va_start(args, format);
612 val = vasnprintf (ret, max_sz, format, args);
618 tmp = malloc (val + 1);
622 ret2 = vsprintf (tmp, format, args);
623 if (val != ret2 || strcmp(*ret, tmp))
634 #if !defined(HAVE_VASPRINTF) || defined(TEST_SNPRINTF)
635 int ROKEN_LIB_FUNCTION
636 vasprintf (char **ret, const char *format, va_list args)
638 return vasnprintf (ret, 0, format, args);
643 #if !defined(HAVE_VASNPRINTF) || defined(TEST_SNPRINTF)
644 int ROKEN_LIB_FUNCTION
645 vasnprintf (char **ret, size_t max_sz, const char *format, va_list args)
648 struct snprintf_state state;
650 state.max_sz = max_sz;
652 state.str = malloc(state.sz);
653 if (state.str == NULL) {
658 state.theend = state.s + state.sz - 1;
659 state.append_char = as_append_char;
661 st = xyzprintf (&state, format, args);
670 tmp = realloc (state.str, st+1);
682 #if !defined(HAVE_VSNPRINTF) || defined(TEST_SNPRINTF)
683 int ROKEN_LIB_FUNCTION
684 vsnprintf (char *str, size_t sz, const char *format, va_list args)
686 struct snprintf_state state;
688 unsigned char *ustr = (unsigned char *)str;
694 state.theend = ustr + sz - (sz > 0);
695 state.append_char = sn_append_char;
697 ret = xyzprintf (&state, format, args);
698 if (state.s != NULL && sz != 0)