b_print.c revision 68651 
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	}
815