b_print.c revision 142425 
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/* disable assert() unless BIO_DEBUG has been defined */
60#ifndef BIO_DEBUG
61# ifndef NDEBUG
62#  define NDEBUG
63# endif
64#endif
65
66/*
67 * Stolen from tjh's ssl/ssl_trc.c stuff.
68 */
69
70#include <stdio.h>
71#include <string.h>
72#include <ctype.h>
73#include <assert.h>
74#include <limits.h>
75#include "cryptlib.h"
76#ifndef NO_SYS_TYPES_H
77#include <sys/types.h>
78#endif
79#include <openssl/bn.h>         /* To get BN_LLONG properly defined */
80#include <openssl/bio.h>
81
82#ifdef BN_LLONG
83# ifndef HAVE_LONG_LONG
84#  define HAVE_LONG_LONG 1
85# endif
86#endif
87
88/***************************************************************************/
89
90/*
91 * Copyright Patrick Powell 1995
92 * This code is based on code written by Patrick Powell <papowell@astart.com>
93 * It may be used for any purpose as long as this notice remains intact
94 * on all source code distributions.
95 */
96
97/*
98 * This code contains numerious changes and enhancements which were
99 * made by lots of contributors over the last years to Patrick Powell's
100 * original code:
101 *
102 * o Patrick Powell <papowell@astart.com>      (1995)
103 * o Brandon Long <blong@fiction.net>          (1996, for Mutt)
104 * o Thomas Roessler <roessler@guug.de>        (1998, for Mutt)
105 * o Michael Elkins <me@cs.hmc.edu>            (1998, for Mutt)
106 * o Andrew Tridgell <tridge@samba.org>        (1998, for Samba)
107 * o Luke Mewburn <lukem@netbsd.org>           (1999, for LukemFTP)
108 * o Ralf S. Engelschall <rse@engelschall.com> (1999, for Pth)
109 * o ...                                       (for OpenSSL)
110 */
111
112#ifdef HAVE_LONG_DOUBLE
113#define LDOUBLE long double
114#else
115#define LDOUBLE double
116#endif
117
118#if HAVE_LONG_LONG
119# if defined(OPENSSL_SYS_WIN32) && !defined(__GNUC__)
120# define LLONG _int64
121# else
122# define LLONG long long
123# endif
124#else
125#define LLONG long
126#endif
127
128static void fmtstr     (char **, char **, size_t *, size_t *,
129			const char *, int, int, int);
130static void fmtint     (char **, char **, size_t *, size_t *,
131			LLONG, int, int, int, int);
132static void fmtfp      (char **, char **, size_t *, size_t *,
133			LDOUBLE, int, int, int);
134static void doapr_outch (char **, char **, size_t *, size_t *, int);
135static void _dopr(char **sbuffer, char **buffer,
136		  size_t *maxlen, size_t *retlen, int *truncated,
137		  const char *format, va_list args);
138
139/* format read states */
140#define DP_S_DEFAULT    0
141#define DP_S_FLAGS      1
142#define DP_S_MIN        2
143#define DP_S_DOT        3
144#define DP_S_MAX        4
145#define DP_S_MOD        5
146#define DP_S_CONV       6
147#define DP_S_DONE       7
148
149/* format flags - Bits */
150#define DP_F_MINUS      (1 << 0)
151#define DP_F_PLUS       (1 << 1)
152#define DP_F_SPACE      (1 << 2)
153#define DP_F_NUM        (1 << 3)
154#define DP_F_ZERO       (1 << 4)
155#define DP_F_UP         (1 << 5)
156#define DP_F_UNSIGNED   (1 << 6)
157
158/* conversion flags */
159#define DP_C_SHORT      1
160#define DP_C_LONG       2
161#define DP_C_LDOUBLE    3
162#define DP_C_LLONG      4
163
164/* some handy macros */
165#define char_to_int(p) (p - '0')
166#define OSSL_MAX(p,q) ((p >= q) ? p : q)
167
168static void
169_dopr(
170    char **sbuffer,
171    char **buffer,
172    size_t *maxlen,
173    size_t *retlen,
174    int *truncated,
175    const char *format,
176    va_list args)
177{
178    char ch;
179    LLONG value;
180    LDOUBLE fvalue;
181    char *strvalue;
182    int min;
183    int max;
184    int state;
185    int flags;
186    int cflags;
187    size_t currlen;
188
189    state = DP_S_DEFAULT;
190    flags = currlen = cflags = min = 0;
191    max = -1;
192    ch = *format++;
193
194    while (state != DP_S_DONE) {
195        if (ch == '\0' || (buffer == NULL && currlen >= *maxlen))
196            state = DP_S_DONE;
197
198        switch (state) {
199        case DP_S_DEFAULT:
200            if (ch == '%')
201                state = DP_S_FLAGS;
202            else
203                doapr_outch(sbuffer,buffer, &currlen, maxlen, ch);
204            ch = *format++;
205            break;
206        case DP_S_FLAGS:
207            switch (ch) {
208            case '-':
209                flags |= DP_F_MINUS;
210                ch = *format++;
211                break;
212            case '+':
213                flags |= DP_F_PLUS;
214                ch = *format++;
215                break;
216            case ' ':
217                flags |= DP_F_SPACE;
218                ch = *format++;
219                break;
220            case '#':
221                flags |= DP_F_NUM;
222                ch = *format++;
223                break;
224            case '0':
225                flags |= DP_F_ZERO;
226                ch = *format++;
227                break;
228            default:
229                state = DP_S_MIN;
230                break;
231            }
232            break;
233        case DP_S_MIN:
234            if (isdigit((unsigned char)ch)) {
235                min = 10 * min + char_to_int(ch);
236                ch = *format++;
237            } else if (ch == '*') {
238                min = va_arg(args, int);
239                ch = *format++;
240                state = DP_S_DOT;
241            } else
242                state = DP_S_DOT;
243            break;
244        case DP_S_DOT:
245            if (ch == '.') {
246                state = DP_S_MAX;
247                ch = *format++;
248            } else
249                state = DP_S_MOD;
250            break;
251        case DP_S_MAX:
252            if (isdigit((unsigned char)ch)) {
253                if (max < 0)
254                    max = 0;
255                max = 10 * max + char_to_int(ch);
256                ch = *format++;
257            } else if (ch == '*') {
258                max = va_arg(args, int);
259                ch = *format++;
260                state = DP_S_MOD;
261            } else
262                state = DP_S_MOD;
263            break;
264        case DP_S_MOD:
265            switch (ch) {
266            case 'h':
267                cflags = DP_C_SHORT;
268                ch = *format++;
269                break;
270            case 'l':
271                if (*format == 'l') {
272                    cflags = DP_C_LLONG;
273                    format++;
274                } else
275                    cflags = DP_C_LONG;
276                ch = *format++;
277                break;
278            case 'q':
279                cflags = DP_C_LLONG;
280                ch = *format++;
281                break;
282            case 'L':
283                cflags = DP_C_LDOUBLE;
284                ch = *format++;
285                break;
286            default:
287                break;
288            }
289            state = DP_S_CONV;
290            break;
291        case DP_S_CONV:
292            switch (ch) {
293            case 'd':
294            case 'i':
295                switch (cflags) {
296                case DP_C_SHORT:
297                    value = (short int)va_arg(args, int);
298                    break;
299                case DP_C_LONG:
300                    value = va_arg(args, long int);
301                    break;
302                case DP_C_LLONG:
303                    value = va_arg(args, LLONG);
304                    break;
305                default:
306                    value = va_arg(args, int);
307                    break;
308                }
309                fmtint(sbuffer, buffer, &currlen, maxlen,
310                       value, 10, min, max, flags);
311                break;
312            case 'X':
313                flags |= DP_F_UP;
314                /* FALLTHROUGH */
315            case 'x':
316            case 'o':
317            case 'u':
318                flags |= DP_F_UNSIGNED;
319                switch (cflags) {
320                case DP_C_SHORT:
321                    value = (unsigned short int)va_arg(args, unsigned int);
322                    break;
323                case DP_C_LONG:
324                    value = (LLONG) va_arg(args,
325                        unsigned long int);
326                    break;
327                case DP_C_LLONG:
328                    value = va_arg(args, unsigned LLONG);
329                    break;
330                default:
331                    value = (LLONG) va_arg(args,
332                        unsigned int);
333                    break;
334                }
335                fmtint(sbuffer, buffer, &currlen, maxlen, value,
336                       ch == 'o' ? 8 : (ch == 'u' ? 10 : 16),
337                       min, max, flags);
338                break;
339            case 'f':
340                if (cflags == DP_C_LDOUBLE)
341                    fvalue = va_arg(args, LDOUBLE);
342                else
343                    fvalue = va_arg(args, double);
344                fmtfp(sbuffer, buffer, &currlen, maxlen,
345                      fvalue, min, max, flags);
346                break;
347            case 'E':
348                flags |= DP_F_UP;
349            case 'e':
350                if (cflags == DP_C_LDOUBLE)
351                    fvalue = va_arg(args, LDOUBLE);
352                else
353                    fvalue = va_arg(args, double);
354                break;
355            case 'G':
356                flags |= DP_F_UP;
357            case 'g':
358                if (cflags == DP_C_LDOUBLE)
359                    fvalue = va_arg(args, LDOUBLE);
360                else
361                    fvalue = va_arg(args, double);
362                break;
363            case 'c':
364                doapr_outch(sbuffer, buffer, &currlen, maxlen,
365                    va_arg(args, int));
366                break;
367            case 's':
368                strvalue = va_arg(args, char *);
369                if (max < 0) {
370		    if (buffer)
371			max = INT_MAX;
372		    else
373			max = *maxlen;
374		}
375                fmtstr(sbuffer, buffer, &currlen, maxlen, strvalue,
376                       flags, min, max);
377                break;
378            case 'p':
379                value = (long)va_arg(args, void *);
380                fmtint(sbuffer, buffer, &currlen, maxlen,
381                    value, 16, min, max, flags|DP_F_NUM);
382                break;
383            case 'n': /* XXX */
384                if (cflags == DP_C_SHORT) {
385                    short int *num;
386                    num = va_arg(args, short int *);
387                    *num = currlen;
388                } else if (cflags == DP_C_LONG) { /* XXX */
389                    long int *num;
390                    num = va_arg(args, long int *);
391                    *num = (long int) currlen;
392                } else if (cflags == DP_C_LLONG) { /* XXX */
393                    LLONG *num;
394                    num = va_arg(args, LLONG *);
395                    *num = (LLONG) currlen;
396                } else {
397                    int    *num;
398                    num = va_arg(args, int *);
399                    *num = currlen;
400                }
401                break;
402            case '%':
403                doapr_outch(sbuffer, buffer, &currlen, maxlen, ch);
404                break;
405            case 'w':
406                /* not supported yet, treat as next char */
407                ch = *format++;
408                break;
409            default:
410                /* unknown, skip */
411                break;
412            }
413            ch = *format++;
414            state = DP_S_DEFAULT;
415            flags = cflags = min = 0;
416            max = -1;
417            break;
418        case DP_S_DONE:
419            break;
420        default:
421            break;
422        }
423    }
424    *truncated = (currlen > *maxlen - 1);
425    if (*truncated)
426        currlen = *maxlen - 1;
427    doapr_outch(sbuffer, buffer, &currlen, maxlen, '\0');
428    *retlen = currlen - 1;
429    return;
430}
431
432static void
433fmtstr(
434    char **sbuffer,
435    char **buffer,
436    size_t *currlen,
437    size_t *maxlen,
438    const char *value,
439    int flags,
440    int min,
441    int max)
442{
443    int padlen, strln;
444    int cnt = 0;
445
446    if (value == 0)
447        value = "<NULL>";
448    for (strln = 0; value[strln]; ++strln)
449        ;
450    padlen = min - strln;
451    if (padlen < 0)
452        padlen = 0;
453    if (flags & DP_F_MINUS)
454        padlen = -padlen;
455
456    while ((padlen > 0) && (cnt < max)) {
457        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
458        --padlen;
459        ++cnt;
460    }
461    while (*value && (cnt < max)) {
462        doapr_outch(sbuffer, buffer, currlen, maxlen, *value++);
463        ++cnt;
464    }
465    while ((padlen < 0) && (cnt < max)) {
466        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
467        ++padlen;
468        ++cnt;
469    }
470}
471
472static void
473fmtint(
474    char **sbuffer,
475    char **buffer,
476    size_t *currlen,
477    size_t *maxlen,
478    LLONG value,
479    int base,
480    int min,
481    int max,
482    int flags)
483{
484    int signvalue = 0;
485    char *prefix = "";
486    unsigned LLONG uvalue;
487    char convert[DECIMAL_SIZE(value)+3];
488    int place = 0;
489    int spadlen = 0;
490    int zpadlen = 0;
491    int caps = 0;
492
493    if (max < 0)
494        max = 0;
495    uvalue = value;
496    if (!(flags & DP_F_UNSIGNED)) {
497        if (value < 0) {
498            signvalue = '-';
499            uvalue = -value;
500        } else if (flags & DP_F_PLUS)
501            signvalue = '+';
502        else if (flags & DP_F_SPACE)
503            signvalue = ' ';
504    }
505    if (flags & DP_F_NUM) {
506	if (base == 8) prefix = "0";
507	if (base == 16) prefix = "0x";
508    }
509    if (flags & DP_F_UP)
510        caps = 1;
511    do {
512        convert[place++] =
513            (caps ? "0123456789ABCDEF" : "0123456789abcdef")
514            [uvalue % (unsigned) base];
515        uvalue = (uvalue / (unsigned) base);
516    } while (uvalue && (place < sizeof convert));
517    if (place == sizeof convert)
518        place--;
519    convert[place] = 0;
520
521    zpadlen = max - place;
522    spadlen = min - OSSL_MAX(max, place) - (signvalue ? 1 : 0) - strlen(prefix);
523    if (zpadlen < 0)
524        zpadlen = 0;
525    if (spadlen < 0)
526        spadlen = 0;
527    if (flags & DP_F_ZERO) {
528        zpadlen = OSSL_MAX(zpadlen, spadlen);
529        spadlen = 0;
530    }
531    if (flags & DP_F_MINUS)
532        spadlen = -spadlen;
533
534    /* spaces */
535    while (spadlen > 0) {
536        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
537        --spadlen;
538    }
539
540    /* sign */
541    if (signvalue)
542        doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
543
544    /* prefix */
545    while (*prefix) {
546	doapr_outch(sbuffer, buffer, currlen, maxlen, *prefix);
547	prefix++;
548    }
549
550    /* zeros */
551    if (zpadlen > 0) {
552        while (zpadlen > 0) {
553            doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
554            --zpadlen;
555        }
556    }
557    /* digits */
558    while (place > 0)
559        doapr_outch(sbuffer, buffer, currlen, maxlen, convert[--place]);
560
561    /* left justified spaces */
562    while (spadlen < 0) {
563        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
564        ++spadlen;
565    }
566    return;
567}
568
569static LDOUBLE
570abs_val(LDOUBLE value)
571{
572    LDOUBLE result = value;
573    if (value < 0)
574        result = -value;
575    return result;
576}
577
578static LDOUBLE
579pow10(int in_exp)
580{
581    LDOUBLE result = 1;
582    while (in_exp) {
583        result *= 10;
584        in_exp--;
585    }
586    return result;
587}
588
589static long
590roundv(LDOUBLE value)
591{
592    long intpart;
593    intpart = (long) value;
594    value = value - intpart;
595    if (value >= 0.5)
596        intpart++;
597    return intpart;
598}
599
600static void
601fmtfp(
602    char **sbuffer,
603    char **buffer,
604    size_t *currlen,
605    size_t *maxlen,
606    LDOUBLE fvalue,
607    int min,
608    int max,
609    int flags)
610{
611    int signvalue = 0;
612    LDOUBLE ufvalue;
613    char iconvert[20];
614    char fconvert[20];
615    int iplace = 0;
616    int fplace = 0;
617    int padlen = 0;
618    int zpadlen = 0;
619    int caps = 0;
620    long intpart;
621    long fracpart;
622
623    if (max < 0)
624        max = 6;
625    ufvalue = abs_val(fvalue);
626    if (fvalue < 0)
627        signvalue = '-';
628    else if (flags & DP_F_PLUS)
629        signvalue = '+';
630    else if (flags & DP_F_SPACE)
631        signvalue = ' ';
632
633    intpart = (long)ufvalue;
634
635    /* sorry, we only support 9 digits past the decimal because of our
636       conversion method */
637    if (max > 9)
638        max = 9;
639
640    /* we "cheat" by converting the fractional part to integer by
641       multiplying by a factor of 10 */
642    fracpart = roundv((pow10(max)) * (ufvalue - intpart));
643
644    if (fracpart >= (long)pow10(max)) {
645        intpart++;
646        fracpart -= (long)pow10(max);
647    }
648
649    /* convert integer part */
650    do {
651        iconvert[iplace++] =
652            (caps ? "0123456789ABCDEF"
653              : "0123456789abcdef")[intpart % 10];
654        intpart = (intpart / 10);
655    } while (intpart && (iplace < sizeof iconvert));
656    if (iplace == sizeof iconvert)
657        iplace--;
658    iconvert[iplace] = 0;
659
660    /* convert fractional part */
661    do {
662        fconvert[fplace++] =
663            (caps ? "0123456789ABCDEF"
664              : "0123456789abcdef")[fracpart % 10];
665        fracpart = (fracpart / 10);
666    } while (fplace < max);
667    if (fplace == sizeof fconvert)
668        fplace--;
669    fconvert[fplace] = 0;
670
671    /* -1 for decimal point, another -1 if we are printing a sign */
672    padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
673    zpadlen = max - fplace;
674    if (zpadlen < 0)
675        zpadlen = 0;
676    if (padlen < 0)
677        padlen = 0;
678    if (flags & DP_F_MINUS)
679        padlen = -padlen;
680
681    if ((flags & DP_F_ZERO) && (padlen > 0)) {
682        if (signvalue) {
683            doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
684            --padlen;
685            signvalue = 0;
686        }
687        while (padlen > 0) {
688            doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
689            --padlen;
690        }
691    }
692    while (padlen > 0) {
693        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
694        --padlen;
695    }
696    if (signvalue)
697        doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
698
699    while (iplace > 0)
700        doapr_outch(sbuffer, buffer, currlen, maxlen, iconvert[--iplace]);
701
702    /*
703     * Decimal point. This should probably use locale to find the correct
704     * char to print out.
705     */
706    if (max > 0 || (flags & DP_F_NUM)) {
707        doapr_outch(sbuffer, buffer, currlen, maxlen, '.');
708
709        while (fplace > 0)
710            doapr_outch(sbuffer, buffer, currlen, maxlen, fconvert[--fplace]);
711    }
712    while (zpadlen > 0) {
713        doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
714        --zpadlen;
715    }
716
717    while (padlen < 0) {
718        doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
719        ++padlen;
720    }
721}
722
723static void
724doapr_outch(
725    char **sbuffer,
726    char **buffer,
727    size_t *currlen,
728    size_t *maxlen,
729    int c)
730{
731    /* If we haven't at least one buffer, someone has doe a big booboo */
732    assert(*sbuffer != NULL || buffer != NULL);
733
734    if (buffer) {
735	while (*currlen >= *maxlen) {
736	    if (*buffer == NULL) {
737		if (*maxlen == 0)
738		    *maxlen = 1024;
739		*buffer = OPENSSL_malloc(*maxlen);
740		if (*currlen > 0) {
741		    assert(*sbuffer != NULL);
742		    memcpy(*buffer, *sbuffer, *currlen);
743		}
744		*sbuffer = NULL;
745	    } else {
746		*maxlen += 1024;
747		*buffer = OPENSSL_realloc(*buffer, *maxlen);
748	    }
749	}
750	/* What to do if *buffer is NULL? */
751	assert(*sbuffer != NULL || *buffer != NULL);
752    }
753
754    if (*currlen < *maxlen) {
755	if (*sbuffer)
756	    (*sbuffer)[(*currlen)++] = (char)c;
757	else
758	    (*buffer)[(*currlen)++] = (char)c;
759    }
760
761    return;
762}
763
764/***************************************************************************/
765
766int BIO_printf (BIO *bio, const char *format, ...)
767	{
768	va_list args;
769	int ret;
770
771	va_start(args, format);
772
773	ret = BIO_vprintf(bio, format, args);
774
775	va_end(args);
776	return(ret);
777	}
778
779int BIO_vprintf (BIO *bio, const char *format, va_list args)
780	{
781	int ret;
782	size_t retlen;
783	char hugebuf[1024*2];	/* Was previously 10k, which is unreasonable
784				   in small-stack environments, like threads
785				   or DOS programs. */
786	char *hugebufp = hugebuf;
787	size_t hugebufsize = sizeof(hugebuf);
788	char *dynbuf = NULL;
789	int ignored;
790
791	dynbuf = NULL;
792	CRYPTO_push_info("doapr()");
793	_dopr(&hugebufp, &dynbuf, &hugebufsize,
794		&retlen, &ignored, format, args);
795	if (dynbuf)
796		{
797		ret=BIO_write(bio, dynbuf, (int)retlen);
798		OPENSSL_free(dynbuf);
799		}
800	else
801		{
802		ret=BIO_write(bio, hugebuf, (int)retlen);
803		}
804	CRYPTO_pop_info();
805	return(ret);
806	}
807
808/* As snprintf is not available everywhere, we provide our own implementation.
809 * This function has nothing to do with BIOs, but it's closely related
810 * to BIO_printf, and we need *some* name prefix ...
811 * (XXX  the function should be renamed, but to what?) */
812int BIO_snprintf(char *buf, size_t n, const char *format, ...)
813	{
814	va_list args;
815	int ret;
816
817	va_start(args, format);
818
819	ret = BIO_vsnprintf(buf, n, format, args);
820
821	va_end(args);
822	return(ret);
823	}
824
825int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
826	{
827	size_t retlen;
828	int truncated;
829
830	_dopr(&buf, NULL, &n, &retlen, &truncated, format, args);
831
832	if (truncated)
833		/* In case of truncation, return -1 like traditional snprintf.
834		 * (Current drafts for ISO/IEC 9899 say snprintf should return
835		 * the number of characters that would have been written,
836		 * had the buffer been large enough.) */
837		return -1;
838	else
839		return (retlen <= INT_MAX) ? (int)retlen : -1;
840	}
841