b_print.c revision 1.6 
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#define LLONG long long
113#else
114#define LLONG long
115#endif
116
117static void fmtstr     (char **, char **, size_t *, size_t *,
118			const char *, int, int, int);
119static void fmtint     (char **, char **, size_t *, size_t *,
120			LLONG, int, int, int, int);
121static void fmtfp      (char **, char **, size_t *, size_t *,
122			LDOUBLE, int, int, int);
123static void doapr_outch (char **, char **, size_t *, size_t *, int);
124static void _dopr(char **sbuffer, char **buffer,
125		  size_t *maxlen, size_t *retlen, int *truncated,
126		  const char *format, va_list args);
127
128/* format read states */
129#define DP_S_DEFAULT    0
130#define DP_S_FLAGS      1
131#define DP_S_MIN        2
132#define DP_S_DOT        3
133#define DP_S_MAX        4
134#define DP_S_MOD        5
135#define DP_S_CONV       6
136#define DP_S_DONE       7
137
138/* format flags - Bits */
139#define DP_F_MINUS      (1 << 0)
140#define DP_F_PLUS       (1 << 1)
141#define DP_F_SPACE      (1 << 2)
142#define DP_F_NUM        (1 << 3)
143#define DP_F_ZERO       (1 << 4)
144#define DP_F_UP         (1 << 5)
145#define DP_F_UNSIGNED   (1 << 6)
146
147/* conversion flags */
148#define DP_C_SHORT      1
149#define DP_C_LONG       2
150#define DP_C_LDOUBLE    3
151#define DP_C_LLONG      4
152
153/* some handy macros */
154#define char_to_int(p) (p - '0')
155#define MAX(p,q) ((p >= q) ? p : q)
156
157static void
158_dopr(
159    char **sbuffer,
160    char **buffer,
161    size_t *maxlen,
162    size_t *retlen,
163    int *truncated,
164    const char *format,
165    va_list args)
166{
167    char ch;
168    LLONG value;
169    LDOUBLE fvalue;
170    char *strvalue;
171    int min;
172    int max;
173    int state;
174    int flags;
175    int cflags;
176    size_t currlen;
177
178    state = DP_S_DEFAULT;
179    flags = currlen = cflags = min = 0;
180    max = -1;
181    ch = *format++;
182
183    while (state != DP_S_DONE) {
184        if (ch == '\0' || (buffer == NULL && currlen >= *maxlen))
185            state = DP_S_DONE;
186
187        switch (state) {
188        case DP_S_DEFAULT:
189            if (ch == '%')
190                state = DP_S_FLAGS;
191            else
192                doapr_outch(sbuffer,buffer, &currlen, maxlen, ch);
193            ch = *format++;
194            break;
195        case DP_S_FLAGS:
196            switch (ch) {
197            case '-':
198                flags |= DP_F_MINUS;
199                ch = *format++;
200                break;
201            case '+':
202                flags |= DP_F_PLUS;
203                ch = *format++;
204                break;
205            case ' ':
206                flags |= DP_F_SPACE;
207                ch = *format++;
208                break;
209            case '#':
210                flags |= DP_F_NUM;
211                ch = *format++;
212                break;
213            case '0':
214                flags |= DP_F_ZERO;
215                ch = *format++;
216                break;
217            default:
218                state = DP_S_MIN;
219                break;
220            }
221            break;
222        case DP_S_MIN:
223            if (isdigit((unsigned char)ch)) {
224                min = 10 * min + char_to_int(ch);
225                ch = *format++;
226            } else if (ch == '*') {
227                min = va_arg(args, int);
228                ch = *format++;
229                state = DP_S_DOT;
230            } else
231                state = DP_S_DOT;
232            break;
233        case DP_S_DOT:
234            if (ch == '.') {
235                state = DP_S_MAX;
236                ch = *format++;
237            } else
238                state = DP_S_MOD;
239            break;
240        case DP_S_MAX:
241            if (isdigit((unsigned char)ch)) {
242                if (max < 0)
243                    max = 0;
244                max = 10 * max + char_to_int(ch);
245                ch = *format++;
246            } else if (ch == '*') {
247                max = va_arg(args, int);
248                ch = *format++;
249                state = DP_S_MOD;
250            } else
251                state = DP_S_MOD;
252            break;
253        case DP_S_MOD:
254            switch (ch) {
255            case 'h':
256                cflags = DP_C_SHORT;
257                ch = *format++;
258                break;
259            case 'l':
260                if (*format == 'l') {
261                    cflags = DP_C_LLONG;
262                    format++;
263                } else
264                    cflags = DP_C_LONG;
265                ch = *format++;
266                break;
267            case 'q':
268                cflags = DP_C_LLONG;
269                ch = *format++;
270                break;
271            case 'L':
272                cflags = DP_C_LDOUBLE;
273                ch = *format++;
274                break;
275            default:
276                break;
277            }
278            state = DP_S_CONV;
279            break;
280        case DP_S_CONV:
281            switch (ch) {
282            case 'd':
283            case 'i':
284                switch (cflags) {
285                case DP_C_SHORT:
286                    value = (short int)va_arg(args, int);
287                    break;
288                case DP_C_LONG:
289                    value = va_arg(args, long int);
290                    break;
291                case DP_C_LLONG:
292                    value = va_arg(args, LLONG);
293                    break;
294                default:
295                    value = va_arg(args, int);
296                    break;
297                }
298                fmtint(sbuffer, buffer, &currlen, maxlen,
299                       value, 10, min, max, flags);
300                break;
301            case 'X':
302                flags |= DP_F_UP;
303                /* FALLTHROUGH */
304            case 'x':
305            case 'o':
306            case 'u':
307                flags |= DP_F_UNSIGNED;
308                switch (cflags) {
309                case DP_C_SHORT:
310                    value = (unsigned short int)va_arg(args, unsigned int);
311                    break;
312                case DP_C_LONG:
313                    value = (LLONG) va_arg(args,
314                        unsigned long int);
315                    break;
316                case DP_C_LLONG:
317                    value = va_arg(args, unsigned LLONG);
318                    break;
319                default:
320                    value = (LLONG) va_arg(args,
321                        unsigned int);
322                    break;
323                }
324                fmtint(sbuffer, buffer, &currlen, maxlen, value,
325                       ch == 'o' ? 8 : (ch == 'u' ? 10 : 16),
326                       min, max, flags);
327                break;
328            case 'f':
329                if (cflags == DP_C_LDOUBLE)
330                    fvalue = va_arg(args, LDOUBLE);
331                else
332                    fvalue = va_arg(args, double);
333                fmtfp(sbuffer, buffer, &currlen, maxlen,
334                      fvalue, min, max, flags);
335                break;
336            case 'E':
337                flags |= DP_F_UP;
338            case 'e':
339                if (cflags == DP_C_LDOUBLE)
340                    fvalue = va_arg(args, LDOUBLE);
341                else
342                    fvalue = va_arg(args, double);
343                break;
344            case 'G':
345                flags |= DP_F_UP;
346            case 'g':
347                if (cflags == DP_C_LDOUBLE)
348                    fvalue = va_arg(args, LDOUBLE);
349                else
350                    fvalue = va_arg(args, double);
351                break;
352            case 'c':
353                doapr_outch(sbuffer, buffer, &currlen, maxlen,
354                    va_arg(args, int));
355                break;
356            case 's':
357                strvalue = va_arg(args, char *);
358                if (max < 0) {
359		    if (buffer)
360			max = INT_MAX;
361		    else
362			max = *maxlen;
363		}
364                fmtstr(sbuffer, buffer, &currlen, maxlen, strvalue,
365                       flags, min, max);
366                break;
367            case 'p':
368                value = (long)va_arg(args, void *);
369                fmtint(sbuffer, buffer, &currlen, maxlen,
370                    value, 16, min, max, flags);
371                break;
372            case 'n': /* XXX */
373                if (cflags == DP_C_SHORT) {
374                    short int *num;
375                    num = va_arg(args, short int *);
376                    *num = currlen;
377                } else if (cflags == DP_C_LONG) { /* XXX */
378                    long int *num;
379                    num = va_arg(args, long int *);
380                    *num = (long int) currlen;
381                } else if (cflags == DP_C_LLONG) { /* XXX */
382                    LLONG *num;
383                    num = va_arg(args, LLONG *);
384                    *num = (LLONG) currlen;
385                } else {
386                    int    *num;
387                    num = va_arg(args, int *);
388                    *num = currlen;
389                }
390                break;
391            case '%':
392                doapr_outch(sbuffer, buffer, &currlen, maxlen, ch);
393                break;
394            case 'w':
395                /* not supported yet, treat as next char */
396                ch = *format++;
397                break;
398            default:
399                /* unknown, skip */
400                break;
401            }
402            ch = *format++;
403            state = DP_S_DEFAULT;
404            flags = cflags = min = 0;
405            max = -1;
406            break;
407        case DP_S_DONE:
408            break;
409        default:
410            break;
411        }
412    }
413    *truncated = (currlen > *maxlen - 1);
414    if (*truncated)
415        currlen = *maxlen - 1;
416    doapr_outch(sbuffer, buffer, &currlen, maxlen, '\0');
417    *retlen = currlen - 1;
418    return;
419}
420
421static void
422fmtstr(
423    char **sbuffer,
424    char **buffer,
425    size_t *currlen,
426    size_t *maxlen,
427    const char *value,
428    int flags,
429    int min,
430    int max)
431{
432    int padlen, strln;
433    int cnt = 0;
434
435    if (value == 0)
436        value = "<NULL>";
437    for (strln = 0; value[strln]; ++strln)
438        ;
439    padlen = min - strln;
440    if (padlen < 0)
441        padlen = 0;
442    if (flags & DP_F_MINUS)
443        padlen = -padlen;
444
445    while ((padlen > 0) && (cnt < max)) {
446        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
447        --padlen;
448        ++cnt;
449    }
450    while (*value && (cnt < max)) {
451        doapr_outch(sbuffer, buffer, currlen, maxlen, *value++);
452        ++cnt;
453    }
454    while ((padlen < 0) && (cnt < max)) {
455        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
456        ++padlen;
457        ++cnt;
458    }
459}
460
461static void
462fmtint(
463    char **sbuffer,
464    char **buffer,
465    size_t *currlen,
466    size_t *maxlen,
467    LLONG value,
468    int base,
469    int min,
470    int max,
471    int flags)
472{
473    int signvalue = 0;
474    unsigned LLONG uvalue;
475    char convert[20];
476    int place = 0;
477    int spadlen = 0;
478    int zpadlen = 0;
479    int caps = 0;
480
481    if (max < 0)
482        max = 0;
483    uvalue = value;
484    if (!(flags & DP_F_UNSIGNED)) {
485        if (value < 0) {
486            signvalue = '-';
487            uvalue = -value;
488        } else if (flags & DP_F_PLUS)
489            signvalue = '+';
490        else if (flags & DP_F_SPACE)
491            signvalue = ' ';
492    }
493    if (flags & DP_F_UP)
494        caps = 1;
495    do {
496        convert[place++] =
497            (caps ? "0123456789ABCDEF" : "0123456789abcdef")
498            [uvalue % (unsigned) base];
499        uvalue = (uvalue / (unsigned) base);
500    } while (uvalue && (place < 20));
501    if (place == 20)
502        place--;
503    convert[place] = 0;
504
505    zpadlen = max - place;
506    spadlen = min - MAX(max, place) - (signvalue ? 1 : 0);
507    if (zpadlen < 0)
508        zpadlen = 0;
509    if (spadlen < 0)
510        spadlen = 0;
511    if (flags & DP_F_ZERO) {
512        zpadlen = MAX(zpadlen, spadlen);
513        spadlen = 0;
514    }
515    if (flags & DP_F_MINUS)
516        spadlen = -spadlen;
517
518    /* spaces */
519    while (spadlen > 0) {
520        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
521        --spadlen;
522    }
523
524    /* sign */
525    if (signvalue)
526        doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
527
528    /* zeros */
529    if (zpadlen > 0) {
530        while (zpadlen > 0) {
531            doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
532            --zpadlen;
533        }
534    }
535    /* digits */
536    while (place > 0)
537        doapr_outch(sbuffer, buffer, currlen, maxlen, convert[--place]);
538
539    /* left justified spaces */
540    while (spadlen < 0) {
541        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
542        ++spadlen;
543    }
544    return;
545}
546
547static LDOUBLE
548abs_val(LDOUBLE value)
549{
550    LDOUBLE result = value;
551    if (value < 0)
552        result = -value;
553    return result;
554}
555
556static LDOUBLE
557pow10(int exp)
558{
559    LDOUBLE result = 1;
560    while (exp) {
561        result *= 10;
562        exp--;
563    }
564    return result;
565}
566
567static long
568round(LDOUBLE value)
569{
570    long intpart;
571    intpart = (long) value;
572    value = value - intpart;
573    if (value >= 0.5)
574        intpart++;
575    return intpart;
576}
577
578static void
579fmtfp(
580    char **sbuffer,
581    char **buffer,
582    size_t *currlen,
583    size_t *maxlen,
584    LDOUBLE fvalue,
585    int min,
586    int max,
587    int flags)
588{
589    int signvalue = 0;
590    LDOUBLE ufvalue;
591    char iconvert[20];
592    char fconvert[20];
593    int iplace = 0;
594    int fplace = 0;
595    int padlen = 0;
596    int zpadlen = 0;
597    int caps = 0;
598    long intpart;
599    long fracpart;
600
601    if (max < 0)
602        max = 6;
603    ufvalue = abs_val(fvalue);
604    if (fvalue < 0)
605        signvalue = '-';
606    else if (flags & DP_F_PLUS)
607        signvalue = '+';
608    else if (flags & DP_F_SPACE)
609        signvalue = ' ';
610
611    intpart = (long)ufvalue;
612
613    /* sorry, we only support 9 digits past the decimal because of our
614       conversion method */
615    if (max > 9)
616        max = 9;
617
618    /* we "cheat" by converting the fractional part to integer by
619       multiplying by a factor of 10 */
620    fracpart = round((pow10(max)) * (ufvalue - intpart));
621
622    if (fracpart >= pow10(max)) {
623        intpart++;
624        fracpart -= (long)pow10(max);
625    }
626
627    /* convert integer part */
628    do {
629        iconvert[iplace++] =
630            (caps ? "0123456789ABCDEF"
631              : "0123456789abcdef")[intpart % 10];
632        intpart = (intpart / 10);
633    } while (intpart && (iplace < 20));
634    if (iplace == 20)
635        iplace--;
636    iconvert[iplace] = 0;
637
638    /* convert fractional part */
639    do {
640        fconvert[fplace++] =
641            (caps ? "0123456789ABCDEF"
642              : "0123456789abcdef")[fracpart % 10];
643        fracpart = (fracpart / 10);
644    } while (fracpart && (fplace < 20));
645    if (fplace == 20)
646        fplace--;
647    fconvert[fplace] = 0;
648
649    /* -1 for decimal point, another -1 if we are printing a sign */
650    padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
651    zpadlen = max - fplace;
652    if (zpadlen < 0)
653        zpadlen = 0;
654    if (padlen < 0)
655        padlen = 0;
656    if (flags & DP_F_MINUS)
657        padlen = -padlen;
658
659    if ((flags & DP_F_ZERO) && (padlen > 0)) {
660        if (signvalue) {
661            doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
662            --padlen;
663            signvalue = 0;
664        }
665        while (padlen > 0) {
666            doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
667            --padlen;
668        }
669    }
670    while (padlen > 0) {
671        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
672        --padlen;
673    }
674    if (signvalue)
675        doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
676
677    while (iplace > 0)
678        doapr_outch(sbuffer, buffer, currlen, maxlen, iconvert[--iplace]);
679
680    /*
681     * Decimal point. This should probably use locale to find the correct
682     * char to print out.
683     */
684    if (max > 0) {
685        doapr_outch(sbuffer, buffer, currlen, maxlen, '.');
686
687        while (fplace > 0)
688            doapr_outch(sbuffer, buffer, currlen, maxlen, fconvert[--fplace]);
689    }
690    while (zpadlen > 0) {
691        doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
692        --zpadlen;
693    }
694
695    while (padlen < 0) {
696        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
697        ++padlen;
698    }
699}
700
701static void
702doapr_outch(
703    char **sbuffer,
704    char **buffer,
705    size_t *currlen,
706    size_t *maxlen,
707    int c)
708{
709    /* If we haven't at least one buffer, someone has doe a big booboo */
710    assert(*sbuffer != NULL || buffer != NULL);
711
712    if (buffer) {
713	while (*currlen >= *maxlen) {
714	    if (*buffer == NULL) {
715		assert(*sbuffer != NULL);
716		if (*maxlen == 0)
717		    *maxlen = 1024;
718		*buffer = OPENSSL_malloc(*maxlen);
719		if (*currlen > 0)
720		    memcpy(*buffer, *sbuffer, *currlen);
721		*sbuffer = NULL;
722	    } else {
723		*maxlen += 1024;
724		*buffer = OPENSSL_realloc(*buffer, *maxlen);
725	    }
726	}
727	/* What to do if *buffer is NULL? */
728	assert(*sbuffer != NULL || *buffer != NULL);
729    }
730
731    if (*currlen < *maxlen) {
732	if (*sbuffer)
733	    (*sbuffer)[(*currlen)++] = (char)c;
734	else
735	    (*buffer)[(*currlen)++] = (char)c;
736    }
737
738    return;
739}
740
741/***************************************************************************/
742
743int BIO_printf (BIO *bio, const char *format, ...)
744	{
745	va_list args;
746	int ret;
747
748	va_start(args, format);
749
750	ret = BIO_vprintf(bio, format, args);
751
752	va_end(args);
753	return(ret);
754	}
755
756int BIO_vprintf (BIO *bio, const char *format, va_list args)
757	{
758	int ret;
759	size_t retlen;
760	MS_STATIC char hugebuf[1024*10];
761	char *hugebufp = hugebuf;
762	size_t hugebufsize = sizeof(hugebuf);
763	char *dynbuf = NULL;
764	int ignored;
765
766	dynbuf = NULL;
767	CRYPTO_push_info("doapr()");
768	_dopr(&hugebufp, &dynbuf, &hugebufsize,
769		&retlen, &ignored, format, args);
770	if (dynbuf)
771		{
772		ret=BIO_write(bio, dynbuf, (int)retlen);
773		OPENSSL_free(dynbuf);
774		}
775	else
776		{
777		ret=BIO_write(bio, hugebuf, (int)retlen);
778		}
779	CRYPTO_pop_info();
780	return(ret);
781	}
782
783/* As snprintf is not available everywhere, we provide our own implementation.
784 * This function has nothing to do with BIOs, but it's closely related
785 * to BIO_printf, and we need *some* name prefix ...
786 * (XXX  the function should be renamed, but to what?) */
787int BIO_snprintf(char *buf, size_t n, const char *format, ...)
788	{
789	va_list args;
790	int ret;
791
792	va_start(args, format);
793
794	ret = BIO_vsnprintf(buf, n, format, args);
795
796	va_end(args);
797	return(ret);
798	}
799
800int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
801	{
802	size_t retlen;
803	int truncated;
804
805	_dopr(&buf, NULL, &n, &retlen, &truncated, format, args);
806
807	if (truncated)
808		/* In case of truncation, return -1 like traditional snprintf.
809		 * (Current drafts for ISO/IEC 9899 say snprintf should return
810		 * the number of characters that would have been written,
811		 * had the buffer been large enough.) */
812		return -1;
813	else
814		return (retlen <= INT_MAX) ? retlen : -1;
815	}
816