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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/bn.h> /* To get BN_LLONG properly defined */
73#include <openssl/bio.h>
74
75#ifdef BN_LLONG
76# ifndef HAVE_LONG_LONG
77# define HAVE_LONG_LONG 1
78# endif
79#endif
80
81/***************************************************************************/
82
83/*
84 * Copyright Patrick Powell 1995
85 * This code is based on code written by Patrick Powell <papowell@astart.com>
86 * It may be used for any purpose as long as this notice remains intact
87 * on all source code distributions.
88 */
89
90/*
91 * This code contains numerious changes and enhancements which were
92 * made by lots of contributors over the last years to Patrick Powell's
93 * original code:
94 *
95 * o Patrick Powell <papowell@astart.com> (1995)
96 * o Brandon Long <blong@fiction.net> (1996, for Mutt)
97 * o Thomas Roessler <roessler@guug.de> (1998, for Mutt)
98 * o Michael Elkins <me@cs.hmc.edu> (1998, for Mutt)
99 * o Andrew Tridgell <tridge@samba.org> (1998, for Samba)
100 * o Luke Mewburn <lukem@netbsd.org> (1999, for LukemFTP)
101 * o Ralf S. Engelschall <rse@engelschall.com> (1999, for Pth)
102 * o ... (for OpenSSL)
103 */
104
105#if HAVE_LONG_DOUBLE
106#define LDOUBLE long double
107#else
108#define LDOUBLE double
109#endif
110
111#if HAVE_LONG_LONG
112# if defined(WIN32) && !defined(__GNUC__)
113# define LLONG _int64
114# else
115# define LLONG long long
116# endif
117#else
118#define LLONG long
119#endif
120
121static void fmtstr (char **, char **, size_t *, size_t *,
122 const char *, int, int, int);
123static void fmtint (char **, char **, size_t *, size_t *,
124 LLONG, int, int, int, int);
125static void fmtfp (char **, char **, size_t *, size_t *,
126 LDOUBLE, int, int, int);
127static void doapr_outch (char **, char **, size_t *, size_t *, int);
128static void _dopr(char **sbuffer, char **buffer,
129 size_t *maxlen, size_t *retlen, int *truncated,
130 const char *format, va_list args);
131
132/* format read states */
133#define DP_S_DEFAULT 0
134#define DP_S_FLAGS 1
135#define DP_S_MIN 2
136#define DP_S_DOT 3
137#define DP_S_MAX 4
138#define DP_S_MOD 5
139#define DP_S_CONV 6
140#define DP_S_DONE 7
141
142/* format flags - Bits */
143#define DP_F_MINUS (1 << 0)
144#define DP_F_PLUS (1 << 1)
145#define DP_F_SPACE (1 << 2)
146#define DP_F_NUM (1 << 3)
147#define DP_F_ZERO (1 << 4)
148#define DP_F_UP (1 << 5)
149#define DP_F_UNSIGNED (1 << 6)
150
151/* conversion flags */
152#define DP_C_SHORT 1
153#define DP_C_LONG 2
154#define DP_C_LDOUBLE 3
155#define DP_C_LLONG 4
156
157/* some handy macros */
158#define char_to_int(p) (p - '0')
159#define OSSL_MAX(p,q) ((p >= q) ? p : q)
160
161static void
162_dopr(
163 char **sbuffer,
164 char **buffer,
165 size_t *maxlen,
166 size_t *retlen,
167 int *truncated,
168 const char *format,
169 va_list args)
170{
171 char ch;
172 LLONG value;
173 LDOUBLE fvalue;
174 char *strvalue;
175 int min;
176 int max;
177 int state;
178 int flags;
179 int cflags;
180 size_t currlen;
181
182 state = DP_S_DEFAULT;
183 flags = currlen = cflags = min = 0;
184 max = -1;
185 ch = *format++;
186
187 while (state != DP_S_DONE) {
188 if (ch == '\0' || (buffer == NULL && currlen >= *maxlen))
189 state = DP_S_DONE;
190
191 switch (state) {
192 case DP_S_DEFAULT:
193 if (ch == '%')
194 state = DP_S_FLAGS;
195 else
196 doapr_outch(sbuffer,buffer, &currlen, maxlen, ch);
197 ch = *format++;
198 break;
199 case DP_S_FLAGS:
200 switch (ch) {
201 case '-':
202 flags |= DP_F_MINUS;
203 ch = *format++;
204 break;
205 case '+':
206 flags |= DP_F_PLUS;
207 ch = *format++;
208 break;
209 case ' ':
210 flags |= DP_F_SPACE;
211 ch = *format++;
212 break;
213 case '#':
214 flags |= DP_F_NUM;
215 ch = *format++;
216 break;
217 case '0':
218 flags |= DP_F_ZERO;
219 ch = *format++;
220 break;
221 default:
222 state = DP_S_MIN;
223 break;
224 }
225 break;
226 case DP_S_MIN:
227 if (isdigit((unsigned char)ch)) {
228 min = 10 * min + char_to_int(ch);
229 ch = *format++;
230 } else if (ch == '*') {
231 min = va_arg(args, int);
232 ch = *format++;
233 state = DP_S_DOT;
234 } else
235 state = DP_S_DOT;
236 break;
237 case DP_S_DOT:
238 if (ch == '.') {
239 state = DP_S_MAX;
240 ch = *format++;
241 } else
242 state = DP_S_MOD;
243 break;
244 case DP_S_MAX:
245 if (isdigit((unsigned char)ch)) {
246 if (max < 0)
247 max = 0;
248 max = 10 * max + char_to_int(ch);
249 ch = *format++;
250 } else if (ch == '*') {
251 max = va_arg(args, int);
252 ch = *format++;
253 state = DP_S_MOD;
254 } else
255 state = DP_S_MOD;
256 break;
257 case DP_S_MOD:
258 switch (ch) {
259 case 'h':
260 cflags = DP_C_SHORT;
261 ch = *format++;
262 break;
263 case 'l':
264 if (*format == 'l') {
265 cflags = DP_C_LLONG;
266 format++;
267 } else
268 cflags = DP_C_LONG;
269 ch = *format++;
270 break;
271 case 'q':
272 cflags = DP_C_LLONG;
273 ch = *format++;
274 break;
275 case 'L':
276 cflags = DP_C_LDOUBLE;
277 ch = *format++;
278 break;
279 default:
280 break;
281 }
282 state = DP_S_CONV;
283 break;
284 case DP_S_CONV:
285 switch (ch) {
286 case 'd':
287 case 'i':
288 switch (cflags) {
289 case DP_C_SHORT:
290 value = (short int)va_arg(args, int);
291 break;
292 case DP_C_LONG:
293 value = va_arg(args, long int);
294 break;
295 case DP_C_LLONG:
296 value = va_arg(args, LLONG);
297 break;
298 default:
299 value = va_arg(args, int);
300 break;
301 }
302 fmtint(sbuffer, buffer, &currlen, maxlen,
303 value, 10, min, max, flags);
304 break;
305 case 'X':
306 flags |= DP_F_UP;
307 /* FALLTHROUGH */
308 case 'x':
309 case 'o':
310 case 'u':
311 flags |= DP_F_UNSIGNED;
312 switch (cflags) {
313 case DP_C_SHORT:
314 value = (unsigned short int)va_arg(args, unsigned int);
315 break;
316 case DP_C_LONG:
317 value = (LLONG) va_arg(args,
318 unsigned long int);
319 break;
320 case DP_C_LLONG:
321 value = va_arg(args, unsigned LLONG);
322 break;
323 default:
324 value = (LLONG) va_arg(args,
325 unsigned int);
326 break;
327 }
328 fmtint(sbuffer, buffer, &currlen, maxlen, value,
329 ch == 'o' ? 8 : (ch == 'u' ? 10 : 16),
330 min, max, flags);
331 break;
332 case 'f':
333 if (cflags == DP_C_LDOUBLE)
334 fvalue = va_arg(args, LDOUBLE);
335 else
336 fvalue = va_arg(args, double);
337 fmtfp(sbuffer, buffer, &currlen, maxlen,
338 fvalue, min, max, flags);
339 break;
340 case 'E':
341 flags |= DP_F_UP;
342 case 'e':
343 if (cflags == DP_C_LDOUBLE)
344 fvalue = va_arg(args, LDOUBLE);
345 else
346 fvalue = va_arg(args, double);
347 break;
348 case 'G':
349 flags |= DP_F_UP;
350 case 'g':
351 if (cflags == DP_C_LDOUBLE)
352 fvalue = va_arg(args, LDOUBLE);
353 else
354 fvalue = va_arg(args, double);
355 break;
356 case 'c':
357 doapr_outch(sbuffer, buffer, &currlen, maxlen,
358 va_arg(args, int));
359 break;
360 case 's':
361 strvalue = va_arg(args, char *);
362 if (max < 0) {
363 if (buffer)
364 max = INT_MAX;
365 else
366 max = *maxlen;
367 }
368 fmtstr(sbuffer, buffer, &currlen, maxlen, strvalue,
369 flags, min, max);
370 break;
371 case 'p':
372 value = (long)va_arg(args, void *);
373 fmtint(sbuffer, buffer, &currlen, maxlen,
374 value, 16, min, max, flags);
375 break;
376 case 'n': /* XXX */
377 if (cflags == DP_C_SHORT) {
378 short int *num;
379 num = va_arg(args, short int *);
380 *num = currlen;
381 } else if (cflags == DP_C_LONG) { /* XXX */
382 long int *num;
383 num = va_arg(args, long int *);
384 *num = (long int) currlen;
385 } else if (cflags == DP_C_LLONG) { /* XXX */
386 LLONG *num;
387 num = va_arg(args, LLONG *);
388 *num = (LLONG) currlen;
389 } else {
390 int *num;
391 num = va_arg(args, int *);
392 *num = currlen;
393 }
394 break;
395 case '%':
396 doapr_outch(sbuffer, buffer, &currlen, maxlen, ch);
397 break;
398 case 'w':
399 /* not supported yet, treat as next char */
400 ch = *format++;
401 break;
402 default:
403 /* unknown, skip */
404 break;
405 }
406 ch = *format++;
407 state = DP_S_DEFAULT;
408 flags = cflags = min = 0;
409 max = -1;
410 break;
411 case DP_S_DONE:
412 break;
413 default:
414 break;
415 }
416 }
417 *truncated = (currlen > *maxlen - 1);
418 if (*truncated)
419 currlen = *maxlen - 1;
420 doapr_outch(sbuffer, buffer, &currlen, maxlen, '\0');
421 *retlen = currlen - 1;
422 return;
423}
424
425static void
426fmtstr(
427 char **sbuffer,
428 char **buffer,
429 size_t *currlen,
430 size_t *maxlen,
431 const char *value,
432 int flags,
433 int min,
434 int max)
435{
436 int padlen, strln;
437 int cnt = 0;
438
439 if (value == 0)
440 value = "<NULL>";
441 for (strln = 0; value[strln]; ++strln)
442 ;
443 padlen = min - strln;
444 if (padlen < 0)
445 padlen = 0;
446 if (flags & DP_F_MINUS)
447 padlen = -padlen;
448
449 while ((padlen > 0) && (cnt < max)) {
450 doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
451 --padlen;
452 ++cnt;
453 }
454 while (*value && (cnt < max)) {
455 doapr_outch(sbuffer, buffer, currlen, maxlen, *value++);
456 ++cnt;
457 }
458 while ((padlen < 0) && (cnt < max)) {
459 doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
460 ++padlen;
461 ++cnt;
462 }
463}
464
465static void
466fmtint(
467 char **sbuffer,
468 char **buffer,
469 size_t *currlen,
470 size_t *maxlen,
471 LLONG value,
472 int base,
473 int min,
474 int max,
475 int flags)
476{
477 int signvalue = 0;
478 unsigned LLONG uvalue;
479 char convert[20];
480 int place = 0;
481 int spadlen = 0;
482 int zpadlen = 0;
483 int caps = 0;
484
485 if (max < 0)
486 max = 0;
487 uvalue = value;
488 if (!(flags & DP_F_UNSIGNED)) {
489 if (value < 0) {
490 signvalue = '-';
491 uvalue = -value;
492 } else if (flags & DP_F_PLUS)
493 signvalue = '+';
494 else if (flags & DP_F_SPACE)
495 signvalue = ' ';
496 }
497 if (flags & DP_F_UP)
498 caps = 1;
499 do {
500 convert[place++] =
501 (caps ? "0123456789ABCDEF" : "0123456789abcdef")
502 [uvalue % (unsigned) base];
503 uvalue = (uvalue / (unsigned) base);
504 } while (uvalue && (place < 20));
505 if (place == 20)
506 place--;
507 convert[place] = 0;
508
509 zpadlen = max - place;
510 spadlen = min - OSSL_MAX(max, place) - (signvalue ? 1 : 0);
511 if (zpadlen < 0)
512 zpadlen = 0;
513 if (spadlen < 0)
514 spadlen = 0;
515 if (flags & DP_F_ZERO) {
516 zpadlen = OSSL_MAX(zpadlen, spadlen);
517 spadlen = 0;
518 }
519 if (flags & DP_F_MINUS)
520 spadlen = -spadlen;
521
522 /* spaces */
523 while (spadlen > 0) {
524 doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
525 --spadlen;
526 }
527
528 /* sign */
529 if (signvalue)
530 doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
531
532 /* zeros */
533 if (zpadlen > 0) {
534 while (zpadlen > 0) {
535 doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
536 --zpadlen;
537 }
538 }
539 /* digits */
540 while (place > 0)
541 doapr_outch(sbuffer, buffer, currlen, maxlen, convert[--place]);
542
543 /* left justified spaces */
544 while (spadlen < 0) {
545 doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
546 ++spadlen;
547 }
548 return;
549}
550
551static LDOUBLE
552abs_val(LDOUBLE value)
553{
554 LDOUBLE result = value;
555 if (value < 0)
556 result = -value;
557 return result;
558}
559
560static LDOUBLE
561pow10(int exp)
562{
563 LDOUBLE result = 1;
564 while (exp) {
565 result *= 10;
566 exp--;
567 }
568 return result;
569}
570
571static long
572round(LDOUBLE value)
573{
574 long intpart;
575 intpart = (long) value;
576 value = value - intpart;
577 if (value >= 0.5)
578 intpart++;
579 return intpart;
580}
581
582static void
583fmtfp(
584 char **sbuffer,
585 char **buffer,
586 size_t *currlen,
587 size_t *maxlen,
588 LDOUBLE fvalue,
589 int min,
590 int max,
591 int flags)
592{
593 int signvalue = 0;
594 LDOUBLE ufvalue;
595 char iconvert[20];
596 char fconvert[20];
597 int iplace = 0;
598 int fplace = 0;
599 int padlen = 0;
600 int zpadlen = 0;
601 int caps = 0;
602 long intpart;
603 long fracpart;
604
605 if (max < 0)
606 max = 6;
607 ufvalue = abs_val(fvalue);
608 if (fvalue < 0)
609 signvalue = '-';
610 else if (flags & DP_F_PLUS)
611 signvalue = '+';
612 else if (flags & DP_F_SPACE)
613 signvalue = ' ';
614
615 intpart = (long)ufvalue;
616
617 /* sorry, we only support 9 digits past the decimal because of our
618 conversion method */
619 if (max > 9)
620 max = 9;
621
622 /* we "cheat" by converting the fractional part to integer by
623 multiplying by a factor of 10 */
624 fracpart = round((pow10(max)) * (ufvalue - intpart));
625
626 if (fracpart >= pow10(max)) {
627 intpart++;
628 fracpart -= (long)pow10(max);
629 }
630
631 /* convert integer part */
632 do {
633 iconvert[iplace++] =
634 (caps ? "0123456789ABCDEF"
635 : "0123456789abcdef")[intpart % 10];
636 intpart = (intpart / 10);
637 } while (intpart && (iplace < 20));
638 if (iplace == 20)
639 iplace--;
640 iconvert[iplace] = 0;
641
642 /* convert fractional part */
643 do {
644 fconvert[fplace++] =
645 (caps ? "0123456789ABCDEF"
646 : "0123456789abcdef")[fracpart % 10];
647 fracpart = (fracpart / 10);
648 } while (fplace < max);
649 if (fplace == 20)
650 fplace--;
651 fconvert[fplace] = 0;
652
653 /* -1 for decimal point, another -1 if we are printing a sign */
654 padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
655 zpadlen = max - fplace;
656 if (zpadlen < 0)
657 zpadlen = 0;
658 if (padlen < 0)
659 padlen = 0;
660 if (flags & DP_F_MINUS)
661 padlen = -padlen;
662
663 if ((flags & DP_F_ZERO) && (padlen > 0)) {
664 if (signvalue) {
665 doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
666 --padlen;
667 signvalue = 0;
668 }
669 while (padlen > 0) {
670 doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
671 --padlen;
672 }
673 }
674 while (padlen > 0) {
675 doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
676 --padlen;
677 }
678 if (signvalue)
679 doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
680
681 while (iplace > 0)
682 doapr_outch(sbuffer, buffer, currlen, maxlen, iconvert[--iplace]);
683
684 /*
685 * Decimal point. This should probably use locale to find the correct
686 * char to print out.
687 */
688 if (max > 0) {
689 doapr_outch(sbuffer, buffer, currlen, maxlen, '.');
690
691 while (fplace > 0)
692 doapr_outch(sbuffer, buffer, currlen, maxlen, fconvert[--fplace]);
693 }
694 while (zpadlen > 0) {
695 doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
696 --zpadlen;
697 }
698
699 while (padlen < 0) {
700 doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
701 ++padlen;
702 }
703}
704
705static void
706doapr_outch(
707 char **sbuffer,
708 char **buffer,
709 size_t *currlen,
710 size_t *maxlen,
711 int c)
712{
713 /* If we haven't at least one buffer, someone has doe a big booboo */
714 assert(*sbuffer != NULL || buffer != NULL);
715
716 if (buffer) {
717 while (*currlen >= *maxlen) {
718 if (*buffer == NULL) {
719 assert(*sbuffer != NULL);
720 if (*maxlen == 0)
721 *maxlen = 1024;
722 *buffer = OPENSSL_malloc(*maxlen);
723 if (*currlen > 0)
724 memcpy(*buffer, *sbuffer, *currlen);
725 *sbuffer = NULL;
726 } else {
727 *maxlen += 1024;
728 *buffer = OPENSSL_realloc(*buffer, *maxlen);
729 }
730 }
731 /* What to do if *buffer is NULL? */
732 assert(*sbuffer != NULL || *buffer != NULL);
733 }
734
735 if (*currlen < *maxlen) {
736 if (*sbuffer)
737 (*sbuffer)[(*currlen)++] = (char)c;
738 else
739 (*buffer)[(*currlen)++] = (char)c;
740 }
741
742 return;
743}
744
745/***************************************************************************/
746
747int BIO_printf (BIO *bio, const char *format, ...)
748 {
749 va_list args;
750 int ret;
751
752 va_start(args, format);
753
754 ret = BIO_vprintf(bio, format, args);
755
756 va_end(args);
757 return(ret);
758 }
759
760int BIO_vprintf (BIO *bio, const char *format, va_list args)
761 {
762 int ret;
763 size_t retlen;
764 MS_STATIC char hugebuf[1024*10];
765 char *hugebufp = hugebuf;
766 size_t hugebufsize = sizeof(hugebuf);
767 char *dynbuf = NULL;
768 int ignored;
769
770 dynbuf = NULL;
771 CRYPTO_push_info("doapr()");
772 _dopr(&hugebufp, &dynbuf, &hugebufsize,
773 &retlen, &ignored, format, args);
774 if (dynbuf)
775 {
776 ret=BIO_write(bio, dynbuf, (int)retlen);
777 OPENSSL_free(dynbuf);
778 }
779 else
780 {
781 ret=BIO_write(bio, hugebuf, (int)retlen);
782 }
783 CRYPTO_pop_info();
784 return(ret);
785 }
786
787/* As snprintf is not available everywhere, we provide our own implementation.
788 * This function has nothing to do with BIOs, but it's closely related
789 * to BIO_printf, and we need *some* name prefix ...
790 * (XXX the function should be renamed, but to what?) */
791int BIO_snprintf(char *buf, size_t n, const char *format, ...)
792 {
793 va_list args;
794 int ret;
795
796 va_start(args, format);
797
798 ret = BIO_vsnprintf(buf, n, format, args);
799
800 va_end(args);
801 return(ret);
802 }
803
804int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
805 {
806 size_t retlen;
807 int truncated;
808
809 _dopr(&buf, NULL, &n, &retlen, &truncated, format, args);
810
811 if (truncated)
812 /* In case of truncation, return -1 like traditional snprintf.
813 * (Current drafts for ISO/IEC 9899 say snprintf should return
814 * the number of characters that would have been written,
815 * had the buffer been large enough.) */
816 return -1;
817 else
818 return (retlen <= INT_MAX) ? retlen : -1;
819 }
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