b_print.c revision 79998 
1240116Smarcel/* crypto/bio/b_print.c */
2240116Smarcel/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3240116Smarcel * All rights reserved.
4240116Smarcel *
5240116Smarcel * This package is an SSL implementation written
6240116Smarcel * by Eric Young (eay@cryptsoft.com).
7240116Smarcel * The implementation was written so as to conform with Netscapes SSL.
8240116Smarcel *
9240116Smarcel * This library is free for commercial and non-commercial use as long as
10240116Smarcel * the following conditions are aheared to.  The following conditions
11240116Smarcel * apply to all code found in this distribution, be it the RC4, RSA,
12240116Smarcel * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13240116Smarcel * 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	}
820