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1/* crypto/bio/b_print.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59/*
60 * Stolen from tjh's ssl/ssl_trc.c stuff.
61 */
62
63#include <stdio.h>
64#include <string.h>
65#include <ctype.h>
66#include <assert.h>
67#include <limits.h>
68#include "cryptlib.h"
69#ifndef NO_SYS_TYPES_H
70#include <sys/types.h>
71#endif
72#include <openssl/bio.h>
73
74#ifdef BN_LLONG
75# ifndef HAVE_LONG_LONG
76# define HAVE_LONG_LONG 1
77# endif
78#endif
79
80/***************************************************************************/
81
82/*
83 * Copyright Patrick Powell 1995
84 * This code is based on code written by Patrick Powell <papowell@astart.com>
85 * It may be used for any purpose as long as this notice remains intact
86 * on all source code distributions.
87 */
88
89/*
90 * This code contains numerious changes and enhancements which were
91 * made by lots of contributors over the last years to Patrick Powell's
92 * original code:
93 *
94 * o Patrick Powell <papowell@astart.com> (1995)
95 * o Brandon Long <blong@fiction.net> (1996, for Mutt)
96 * o Thomas Roessler <roessler@guug.de> (1998, for Mutt)
97 * o Michael Elkins <me@cs.hmc.edu> (1998, for Mutt)
98 * o Andrew Tridgell <tridge@samba.org> (1998, for Samba)
99 * o Luke Mewburn <lukem@netbsd.org> (1999, for LukemFTP)
100 * o Ralf S. Engelschall <rse@engelschall.com> (1999, for Pth)
101 * o ... (for OpenSSL)
102 */
103
104#if HAVE_LONG_DOUBLE
105#define LDOUBLE long double
106#else
107#define LDOUBLE double
108#endif
109
110#if HAVE_LONG_LONG
111#define LLONG long long
112#else
113#define LLONG long
114#endif
115
116static void fmtstr (char **, char **, size_t *, size_t *,
117 const char *, int, int, int);
118static void fmtint (char **, char **, size_t *, size_t *,
119 LLONG, int, int, int, int);
120static void fmtfp (char **, char **, size_t *, size_t *,
121 LDOUBLE, int, int, int);
122static void doapr_outch (char **, char **, size_t *, size_t *, int);
123static void _dopr(char **sbuffer, char **buffer,
124 size_t *maxlen, size_t *retlen, int *truncated,
125 const char *format, va_list args);
126
127/* format read states */
128#define DP_S_DEFAULT 0
129#define DP_S_FLAGS 1
130#define DP_S_MIN 2
131#define DP_S_DOT 3
132#define DP_S_MAX 4
133#define DP_S_MOD 5
134#define DP_S_CONV 6
135#define DP_S_DONE 7
136
137/* format flags - Bits */
138#define DP_F_MINUS (1 << 0)
139#define DP_F_PLUS (1 << 1)
140#define DP_F_SPACE (1 << 2)
141#define DP_F_NUM (1 << 3)
142#define DP_F_ZERO (1 << 4)
143#define DP_F_UP (1 << 5)
144#define DP_F_UNSIGNED (1 << 6)
145
146/* conversion flags */
147#define DP_C_SHORT 1
148#define DP_C_LONG 2
149#define DP_C_LDOUBLE 3
150#define DP_C_LLONG 4
151
152/* some handy macros */
153#define char_to_int(p) (p - '0')
154#define MAX(p,q) ((p >= q) ? p : q)
155
156static void
157_dopr(
158 char **sbuffer,
159 char **buffer,
160 size_t *maxlen,
161 size_t *retlen,
162 int *truncated,
163 const char *format,
164 va_list args)
165{
166 char ch;
167 LLONG value;
168 LDOUBLE fvalue;
169 char *strvalue;
170 int min;
171 int max;
172 int state;
173 int flags;
174 int cflags;
175 size_t currlen;
176
177 state = DP_S_DEFAULT;
178 flags = currlen = cflags = min = 0;
179 max = -1;
180 ch = *format++;
181
182 while (state != DP_S_DONE) {
183 if (ch == '\0' || (buffer == NULL && currlen >= *maxlen))
184 state = DP_S_DONE;
185
186 switch (state) {
187 case DP_S_DEFAULT:
188 if (ch == '%')
189 state = DP_S_FLAGS;
190 else
191 doapr_outch(sbuffer,buffer, &currlen, maxlen, ch);
192 ch = *format++;
193 break;
194 case DP_S_FLAGS:
195 switch (ch) {
196 case '-':
197 flags |= DP_F_MINUS;
198 ch = *format++;
199 break;
200 case '+':
201 flags |= DP_F_PLUS;
202 ch = *format++;
203 break;
204 case ' ':
205 flags |= DP_F_SPACE;
206 ch = *format++;
207 break;
208 case '#':
209 flags |= DP_F_NUM;
210 ch = *format++;
211 break;
212 case '0':
213 flags |= DP_F_ZERO;
214 ch = *format++;
215 break;
216 default:
217 state = DP_S_MIN;
218 break;
219 }
220 break;
221 case DP_S_MIN:
222 if (isdigit((unsigned char)ch)) {
223 min = 10 * min + char_to_int(ch);
224 ch = *format++;
225 } else if (ch == '*') {
226 min = va_arg(args, int);
227 ch = *format++;
228 state = DP_S_DOT;
229 } else
230 state = DP_S_DOT;
231 break;
232 case DP_S_DOT:
233 if (ch == '.') {
234 state = DP_S_MAX;
235 ch = *format++;
236 } else
237 state = DP_S_MOD;
238 break;
239 case DP_S_MAX:
240 if (isdigit((unsigned char)ch)) {
241 if (max < 0)
242 max = 0;
243 max = 10 * max + char_to_int(ch);
244 ch = *format++;
245 } else if (ch == '*') {
246 max = va_arg(args, int);
247 ch = *format++;
248 state = DP_S_MOD;
249 } else
250 state = DP_S_MOD;
251 break;
252 case DP_S_MOD:
253 switch (ch) {
254 case 'h':
255 cflags = DP_C_SHORT;
256 ch = *format++;
257 break;
258 case 'l':
259 if (*format == 'l') {
260 cflags = DP_C_LLONG;
261 format++;
262 } else
263 cflags = DP_C_LONG;
264 ch = *format++;
265 break;
266 case 'q':
267 cflags = DP_C_LLONG;
268 ch = *format++;
269 break;
270 case 'L':
271 cflags = DP_C_LDOUBLE;
272 ch = *format++;
273 break;
274 default:
275 break;
276 }
277 state = DP_S_CONV;
278 break;
279 case DP_S_CONV:
280 switch (ch) {
281 case 'd':
282 case 'i':
283 switch (cflags) {
284 case DP_C_SHORT:
285 value = (short int)va_arg(args, int);
286 break;
287 case DP_C_LONG:
288 value = va_arg(args, long int);
289 break;
290 case DP_C_LLONG:
291 value = va_arg(args, LLONG);
292 break;
293 default:
294 value = va_arg(args, int);
295 break;
296 }
297 fmtint(sbuffer, buffer, &currlen, maxlen,
298 value, 10, min, max, flags);
299 break;
300 case 'X':
301 flags |= DP_F_UP;
302 /* FALLTHROUGH */
303 case 'x':
304 case 'o':
305 case 'u':
306 flags |= DP_F_UNSIGNED;
307 switch (cflags) {
308 case DP_C_SHORT:
309 value = (unsigned short int)va_arg(args, unsigned int);
310 break;
311 case DP_C_LONG:
312 value = (LLONG) va_arg(args,
313 unsigned long int);
314 break;
315 case DP_C_LLONG:
316 value = va_arg(args, unsigned LLONG);
317 break;
318 default:
319 value = (LLONG) va_arg(args,
320 unsigned int);
321 break;
322 }
323 fmtint(sbuffer, buffer, &currlen, maxlen, value,
324 ch == 'o' ? 8 : (ch == 'u' ? 10 : 16),
325 min, max, flags);
326 break;
327 case 'f':
328 if (cflags == DP_C_LDOUBLE)
329 fvalue = va_arg(args, LDOUBLE);
330 else
331 fvalue = va_arg(args, double);
332 fmtfp(sbuffer, buffer, &currlen, maxlen,
333 fvalue, min, max, flags);
334 break;
335 case 'E':
336 flags |= DP_F_UP;
337 case 'e':
338 if (cflags == DP_C_LDOUBLE)
339 fvalue = va_arg(args, LDOUBLE);
340 else
341 fvalue = va_arg(args, double);
342 break;
343 case 'G':
344 flags |= DP_F_UP;
345 case 'g':
346 if (cflags == DP_C_LDOUBLE)
347 fvalue = va_arg(args, LDOUBLE);
348 else
349 fvalue = va_arg(args, double);
350 break;
351 case 'c':
352 doapr_outch(sbuffer, buffer, &currlen, maxlen,
353 va_arg(args, int));
354 break;
355 case 's':
356 strvalue = va_arg(args, char *);
357 if (max < 0) {
358 if (buffer)
359 max = INT_MAX;
360 else
361 max = *maxlen;
362 }
363 fmtstr(sbuffer, buffer, &currlen, maxlen, strvalue,
364 flags, min, max);
365 break;
366 case 'p':
367 value = (long)va_arg(args, void *);
368 fmtint(sbuffer, buffer, &currlen, maxlen,
369 value, 16, min, max, flags);
370 break;
371 case 'n': /* XXX */
372 if (cflags == DP_C_SHORT) {
373 short int *num;
374 num = va_arg(args, short int *);
375 *num = currlen;
376 } else if (cflags == DP_C_LONG) { /* XXX */
377 long int *num;
378 num = va_arg(args, long int *);
379 *num = (long int) currlen;
380 } else if (cflags == DP_C_LLONG) { /* XXX */
381 LLONG *num;
382 num = va_arg(args, LLONG *);
383 *num = (LLONG) currlen;
384 } else {
385 int *num;
386 num = va_arg(args, int *);
387 *num = currlen;
388 }
389 break;
390 case '%':
391 doapr_outch(sbuffer, buffer, &currlen, maxlen, ch);
392 break;
393 case 'w':
394 /* not supported yet, treat as next char */
395 ch = *format++;
396 break;
397 default:
398 /* unknown, skip */
399 break;
400 }
401 ch = *format++;
402 state = DP_S_DEFAULT;
403 flags = cflags = min = 0;
404 max = -1;
405 break;
406 case DP_S_DONE:
407 break;
408 default:
409 break;
410 }
411 }
412 *truncated = (currlen > *maxlen - 1);
413 if (*truncated)
414 currlen = *maxlen - 1;
415 doapr_outch(sbuffer, buffer, &currlen, maxlen, '\0');
416 *retlen = currlen - 1;
417 return;
418}
419
420static void
421fmtstr(
422 char **sbuffer,
423 char **buffer,
424 size_t *currlen,
425 size_t *maxlen,
426 const char *value,
427 int flags,
428 int min,
429 int max)
430{
431 int padlen, strln;
432 int cnt = 0;
433
434 if (value == 0)
435 value = "<NULL>";
436 for (strln = 0; value[strln]; ++strln)
437 ;
438 padlen = min - strln;
439 if (padlen < 0)
440 padlen = 0;
441 if (flags & DP_F_MINUS)
442 padlen = -padlen;
443
444 while ((padlen > 0) && (cnt < max)) {
445 doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
446 --padlen;
447 ++cnt;
448 }
449 while (*value && (cnt < max)) {
450 doapr_outch(sbuffer, buffer, currlen, maxlen, *value++);
451 ++cnt;
452 }
453 while ((padlen < 0) && (cnt < max)) {
454 doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
455 ++padlen;
456 ++cnt;
457 }
458}
459
460static void
461fmtint(
462 char **sbuffer,
463 char **buffer,
464 size_t *currlen,
465 size_t *maxlen,
466 LLONG value,
467 int base,
468 int min,
469 int max,
470 int flags)
471{
472 int signvalue = 0;
473 unsigned LLONG uvalue;
474 char convert[20];
475 int place = 0;
476 int spadlen = 0;
477 int zpadlen = 0;
478 int caps = 0;
479
480 if (max < 0)
481 max = 0;
482 uvalue = value;
483 if (!(flags & DP_F_UNSIGNED)) {
484 if (value < 0) {
485 signvalue = '-';
486 uvalue = -value;
487 } else if (flags & DP_F_PLUS)
488 signvalue = '+';
489 else if (flags & DP_F_SPACE)
490 signvalue = ' ';
491 }
492 if (flags & DP_F_UP)
493 caps = 1;
494 do {
495 convert[place++] =
496 (caps ? "0123456789ABCDEF" : "0123456789abcdef")
497 [uvalue % (unsigned) base];
498 uvalue = (uvalue / (unsigned) base);
499 } while (uvalue && (place < 20));
500 if (place == 20)
501 place--;
502 convert[place] = 0;
503
504 zpadlen = max - place;
505 spadlen = min - MAX(max, place) - (signvalue ? 1 : 0);
506 if (zpadlen < 0)
507 zpadlen = 0;
508 if (spadlen < 0)
509 spadlen = 0;
510 if (flags & DP_F_ZERO) {
511 zpadlen = MAX(zpadlen, spadlen);
512 spadlen = 0;
513 }
514 if (flags & DP_F_MINUS)
515 spadlen = -spadlen;
516
517 /* spaces */
518 while (spadlen > 0) {
519 doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
520 --spadlen;
521 }
522
523 /* sign */
524 if (signvalue)
525 doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
526
527 /* zeros */
528 if (zpadlen > 0) {
529 while (zpadlen > 0) {
530 doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
531 --zpadlen;
532 }
533 }
534 /* digits */
535 while (place > 0)
536 doapr_outch(sbuffer, buffer, currlen, maxlen, convert[--place]);
537
538 /* left justified spaces */
539 while (spadlen < 0) {
540 doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
541 ++spadlen;
542 }
543 return;
544}
545
546static LDOUBLE
547abs_val(LDOUBLE value)
548{
549 LDOUBLE result = value;
550 if (value < 0)
551 result = -value;
552 return result;
553}
554
555static LDOUBLE
556pow10(int exp)
557{
558 LDOUBLE result = 1;
559 while (exp) {
560 result *= 10;
561 exp--;
562 }
563 return result;
564}
565
566static long
567round(LDOUBLE value)
568{
569 long intpart;
570 intpart = (long) value;
571 value = value - intpart;
572 if (value >= 0.5)
573 intpart++;
574 return intpart;
575}
576
577static void
578fmtfp(
579 char **sbuffer,
580 char **buffer,
581 size_t *currlen,
582 size_t *maxlen,
583 LDOUBLE fvalue,
584 int min,
585 int max,
586 int flags)
587{
588 int signvalue = 0;
589 LDOUBLE ufvalue;
590 char iconvert[20];
591 char fconvert[20];
592 int iplace = 0;
593 int fplace = 0;
594 int padlen = 0;
595 int zpadlen = 0;
596 int caps = 0;
597 long intpart;
598 long fracpart;
599
600 if (max < 0)
601 max = 6;
602 ufvalue = abs_val(fvalue);
603 if (fvalue < 0)
604 signvalue = '-';
605 else if (flags & DP_F_PLUS)
606 signvalue = '+';
607 else if (flags & DP_F_SPACE)
608 signvalue = ' ';
609
610 intpart = (long)ufvalue;
611
612 /* sorry, we only support 9 digits past the decimal because of our
613 conversion method */
614 if (max > 9)
615 max = 9;
616
617 /* we "cheat" by converting the fractional part to integer by
618 multiplying by a factor of 10 */
619 fracpart = round((pow10(max)) * (ufvalue - intpart));
620
621 if (fracpart >= pow10(max)) {
622 intpart++;
623 fracpart -= (long)pow10(max);
624 }
625
626 /* convert integer part */
627 do {
628 iconvert[iplace++] =
629 (caps ? "0123456789ABCDEF"
630 : "0123456789abcdef")[intpart % 10];
631 intpart = (intpart / 10);
632 } while (intpart && (iplace < 20));
633 if (iplace == 20)
634 iplace--;
635 iconvert[iplace] = 0;
636
637 /* convert fractional part */
638 do {
639 fconvert[fplace++] =
640 (caps ? "0123456789ABCDEF"
641 : "0123456789abcdef")[fracpart % 10];
642 fracpart = (fracpart / 10);
643 } while (fracpart && (fplace < 20));
644 if (fplace == 20)
645 fplace--;
646 fconvert[fplace] = 0;
647
648 /* -1 for decimal point, another -1 if we are printing a sign */
649 padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
650 zpadlen = max - fplace;
651 if (zpadlen < 0)
652 zpadlen = 0;
653 if (padlen < 0)
654 padlen = 0;
655 if (flags & DP_F_MINUS)
656 padlen = -padlen;
657
658 if ((flags & DP_F_ZERO) && (padlen > 0)) {
659 if (signvalue) {
660 doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
661 --padlen;
662 signvalue = 0;
663 }
664 while (padlen > 0) {
665 doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
666 --padlen;
667 }
668 }
669 while (padlen > 0) {
670 doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
671 --padlen;
672 }
673 if (signvalue)
674 doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
675
676 while (iplace > 0)
677 doapr_outch(sbuffer, buffer, currlen, maxlen, iconvert[--iplace]);
678
679 /*
680 * Decimal point. This should probably use locale to find the correct
681 * char to print out.
682 */
683 if (max > 0) {
684 doapr_outch(sbuffer, buffer, currlen, maxlen, '.');
685
686 while (fplace > 0)
687 doapr_outch(sbuffer, buffer, currlen, maxlen, fconvert[--fplace]);
688 }
689 while (zpadlen > 0) {
690 doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
691 --zpadlen;
692 }
693
694 while (padlen < 0) {
695 doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
696 ++padlen;
697 }
698}
699
700static void
701doapr_outch(
702 char **sbuffer,
703 char **buffer,
704 size_t *currlen,
705 size_t *maxlen,
706 int c)
707{
708 /* If we haven't at least one buffer, someone has doe a big booboo */
709 assert(*sbuffer != NULL || buffer != NULL);
710
711 if (buffer) {
712 while (*currlen >= *maxlen) {
713 if (*buffer == NULL) {
714 assert(*sbuffer != NULL);
715 if (*maxlen == 0)
716 *maxlen = 1024;
717 *buffer = OPENSSL_malloc(*maxlen);
718 if (*currlen > 0)
719 memcpy(*buffer, *sbuffer, *currlen);
720 *sbuffer = NULL;
721 } else {
722 *maxlen += 1024;
723 *buffer = OPENSSL_realloc(*buffer, *maxlen);
724 }
725 }
726 /* What to do if *buffer is NULL? */
727 assert(*sbuffer != NULL || *buffer != NULL);
728 }
729
730 if (*currlen < *maxlen) {
731 if (*sbuffer)
732 (*sbuffer)[(*currlen)++] = (char)c;
733 else
734 (*buffer)[(*currlen)++] = (char)c;
735 }
736
737 return;
738}
739
740/***************************************************************************/
741
742int BIO_printf (BIO *bio, const char *format, ...)
743 {
744 va_list args;
745 int ret;
746
747 va_start(args, format);
748
749 ret = BIO_vprintf(bio, format, args);
750
751 va_end(args);
752 return(ret);
753 }
754
755int BIO_vprintf (BIO *bio, const char *format, va_list args)
756 {
757 int ret;
758 size_t retlen;
759 MS_STATIC char hugebuf[1024*10];
760 char *hugebufp = hugebuf;
761 size_t hugebufsize = sizeof(hugebuf);
762 char *dynbuf = NULL;
763 int ignored;
764
765 dynbuf = NULL;
766 CRYPTO_push_info("doapr()");
767 _dopr(&hugebufp, &dynbuf, &hugebufsize,
768 &retlen, &ignored, format, args);
769 if (dynbuf)
770 {
771 ret=BIO_write(bio, dynbuf, (int)retlen);
772 OPENSSL_free(dynbuf);
773 }
774 else
775 {
776 ret=BIO_write(bio, hugebuf, (int)retlen);
777 }
778 CRYPTO_pop_info();
779 return(ret);
780 }
781
782/* As snprintf is not available everywhere, we provide our own implementation.
783 * This function has nothing to do with BIOs, but it's closely related
784 * to BIO_printf, and we need *some* name prefix ...
785 * (XXX the function should be renamed, but to what?) */
786int BIO_snprintf(char *buf, size_t n, const char *format, ...)
787 {
788 va_list args;
789 int ret;
790
791 va_start(args, format);
792
793 ret = BIO_vsnprintf(buf, n, format, args);
794
795 va_end(args);
796 return(ret);
797 }
798
799int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
800 {
801 size_t retlen;
802 int truncated;
803
804 _dopr(&buf, NULL, &n, &retlen, &truncated, format, args);
805
806 if (truncated)
807 /* In case of truncation, return -1 like traditional snprintf.
808 * (Current drafts for ISO/IEC 9899 say snprintf should return
809 * the number of characters that would have been written,
810 * had the buffer been large enough.) */
811 return -1;
812 else
813 return (retlen <= INT_MAX) ? retlen : -1;
814 }
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