crypto/bio/b_print.c

   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 "internal/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 #if defined(BN_LLONG) || defined(SIXTY_FOUR_BIT)
  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 #ifdef HAVE_LONG_LONG
 119 # if defined(_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
 128 static void fmtstr(char **, char **, size_t *, size_t *,
 129                    const char *, int, int, int);
 130 static void fmtint(char **, char **, size_t *, size_t *,
 131                    LLONG, int, int, int, int);
 132 static void fmtfp(char **, char **, size_t *, size_t *,
 133                   LDOUBLE, int, int, int);
 134 static void doapr_outch(char **, char **, size_t *, size_t *, int);
 135 static 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
 168 static void
 169 _dopr(char **sbuffer,
 170       char **buffer,
 171       size_t *maxlen,
 172       size_t *retlen, int *truncated, const char *format, va_list args)
 173 {
 174     char ch;
 175     LLONG value;
 176     LDOUBLE fvalue;
 177     char *strvalue;
 178     int min;
 179     int max;
 180     int state;
 181     int flags;
 182     int cflags;
 183     size_t currlen;
 184
 185     state = DP_S_DEFAULT;
 186     flags = currlen = cflags = min = 0;
 187     max = -1;
 188     ch = *format++;
 189
 190     while (state != DP_S_DONE) {
 191         if (ch == '\0' || (buffer == NULL && currlen >= *maxlen))
 192             state = DP_S_DONE;
 193
 194         switch (state) {
 195         case DP_S_DEFAULT:
 196             if (ch == '%')
 197                 state = DP_S_FLAGS;
 198             else
 199                 doapr_outch(sbuffer, buffer, &currlen, maxlen, ch);
 200             ch = *format++;
 201             break;
 202         case DP_S_FLAGS:
 203             switch (ch) {
 204             case '-':
 205                 flags |= DP_F_MINUS;
 206                 ch = *format++;
 207                 break;
 208             case '+':
 209                 flags |= DP_F_PLUS;
 210                 ch = *format++;
 211                 break;
 212             case ' ':
 213                 flags |= DP_F_SPACE;
 214                 ch = *format++;
 215                 break;
 216             case '#':
 217                 flags |= DP_F_NUM;
 218                 ch = *format++;
 219                 break;
 220             case '0':
 221                 flags |= DP_F_ZERO;
 222                 ch = *format++;
 223                 break;
 224             default:
 225                 state = DP_S_MIN;
 226                 break;
 227             }
 228             break;
 229         case DP_S_MIN:
 230             if (isdigit((unsigned char)ch)) {
 231                 min = 10 * min + char_to_int(ch);
 232                 ch = *format++;
 233             } else if (ch == '*') {
 234                 min = va_arg(args, int);
 235                 ch = *format++;
 236                 state = DP_S_DOT;
 237             } else
 238                 state = DP_S_DOT;
 239             break;
 240         case DP_S_DOT:
 241             if (ch == '.') {
 242                 state = DP_S_MAX;
 243                 ch = *format++;
 244             } else
 245                 state = DP_S_MOD;
 246             break;
 247         case DP_S_MAX:
 248             if (isdigit((unsigned char)ch)) {
 249                 if (max < 0)
 250                     max = 0;
 251                 max = 10 * max + char_to_int(ch);
 252                 ch = *format++;
 253             } else if (ch == '*') {
 254                 max = va_arg(args, int);
 255                 ch = *format++;
 256                 state = DP_S_MOD;
 257             } else
 258                 state = DP_S_MOD;
 259             break;
 260         case DP_S_MOD:
 261             switch (ch) {
 262             case 'h':
 263                 cflags = DP_C_SHORT;
 264                 ch = *format++;
 265                 break;
 266             case 'l':
 267                 if (*format == 'l') {
 268                     cflags = DP_C_LLONG;
 269                     format++;
 270                 } else
 271                     cflags = DP_C_LONG;
 272                 ch = *format++;
 273                 break;
 274             case 'q':
 275                 cflags = DP_C_LLONG;
 276                 ch = *format++;
 277                 break;
 278             case 'L':
 279                 cflags = DP_C_LDOUBLE;
 280                 ch = *format++;
 281                 break;
 282             default:
 283                 break;
 284             }
 285             state = DP_S_CONV;
 286             break;
 287         case DP_S_CONV:
 288             switch (ch) {
 289             case 'd':
 290             case 'i':
 291                 switch (cflags) {
 292                 case DP_C_SHORT:
 293                     value = (short int)va_arg(args, int);
 294                     break;
 295                 case DP_C_LONG:
 296                     value = va_arg(args, long int);
 297                     break;
 298                 case DP_C_LLONG:
 299                     value = va_arg(args, LLONG);
 300                     break;
 301                 default:
 302                     value = va_arg(args, int);
 303                     break;
 304                 }
 305                 fmtint(sbuffer, buffer, &currlen, maxlen,
 306                        value, 10, min, max, flags);
 307                 break;
 308             case 'X':
 309                 flags |= DP_F_UP;
 310                 /* FALLTHROUGH */
 311             case 'x':
 312             case 'o':
 313             case 'u':
 314                 flags |= DP_F_UNSIGNED;
 315                 switch (cflags) {
 316                 case DP_C_SHORT:
 317                     value = (unsigned short int)va_arg(args, unsigned int);
 318                     break;
 319                 case DP_C_LONG:
 320                     value = (LLONG) va_arg(args, unsigned long int);
 321                     break;
 322                 case DP_C_LLONG:
 323                     value = va_arg(args, unsigned LLONG);
 324                     break;
 325                 default:
 326                     value = (LLONG) va_arg(args, unsigned int);
 327                     break;
 328                 }
 329                 fmtint(sbuffer, buffer, &currlen, maxlen, value,
 330                        ch == 'o' ? 8 : (ch == 'u' ? 10 : 16),
 331                        min, max, flags);
 332                 break;
 333             case 'f':
 334                 if (cflags == DP_C_LDOUBLE)
 335                     fvalue = va_arg(args, LDOUBLE);
 336                 else
 337                     fvalue = va_arg(args, double);
 338                 fmtfp(sbuffer, buffer, &currlen, maxlen,
 339                       fvalue, min, max, flags);
 340                 break;
 341             case 'E':
 342                 flags |= DP_F_UP;
 343             case 'e':
 344                 if (cflags == DP_C_LDOUBLE)
 345                     fvalue = va_arg(args, LDOUBLE);
 346                 else
 347                     fvalue = va_arg(args, double);
 348                 break;
 349             case 'G':
 350                 flags |= DP_F_UP;
 351             case 'g':
 352                 if (cflags == DP_C_LDOUBLE)
 353                     fvalue = va_arg(args, LDOUBLE);
 354                 else
 355                     fvalue = va_arg(args, double);
 356                 break;
 357             case 'c':
 358                 doapr_outch(sbuffer, buffer, &currlen, maxlen,
 359                             va_arg(args, int));
 360                 break;
 361             case 's':
 362                 strvalue = va_arg(args, char *);
 363                 if (max < 0) {
 364                     if (buffer)
 365                         max = INT_MAX;
 366                     else
 367                         max = *maxlen;
 368                 }
 369                 fmtstr(sbuffer, buffer, &currlen, maxlen, strvalue,
 370                        flags, min, max);
 371                 break;
 372             case 'p':
 373                 value = (size_t)va_arg(args, void *);
 374                 fmtint(sbuffer, buffer, &currlen, maxlen,
 375                        value, 16, min, max, flags | DP_F_NUM);
 376                 break;
 377             case 'n':          /* XXX */
 378                 if (cflags == DP_C_SHORT) {
 379                     short int *num;
 380                     num = va_arg(args, short int *);
 381                     *num = currlen;
 382                 } else if (cflags == DP_C_LONG) { /* XXX */
 383                     long int *num;
 384                     num = va_arg(args, long int *);
 385                     *num = (long int)currlen;
 386                 } else if (cflags == DP_C_LLONG) { /* XXX */
 387                     LLONG *num;
 388                     num = va_arg(args, LLONG *);
 389                     *num = (LLONG) currlen;
 390                 } else {
 391                     int *num;
 392                     num = va_arg(args, int *);
 393                     *num = currlen;
 394                 }
 395                 break;
 396             case '%':
 397                 doapr_outch(sbuffer, buffer, &currlen, maxlen, ch);
 398                 break;
 399             case 'w':
 400                 /* not supported yet, treat as next char */
 401                 ch = *format++;
 402                 break;
 403             default:
 404                 /* unknown, skip */
 405                 break;
 406             }
 407             ch = *format++;
 408             state = DP_S_DEFAULT;
 409             flags = cflags = min = 0;
 410             max = -1;
 411             break;
 412         case DP_S_DONE:
 413             break;
 414         default:
 415             break;
 416         }
 417     }
 418     *truncated = (currlen > *maxlen - 1);
 419     if (*truncated)
 420         currlen = *maxlen - 1;
 421     doapr_outch(sbuffer, buffer, &currlen, maxlen, '\0');
 422     *retlen = currlen - 1;
 423     return;
 424 }
 425
 426 static void
 427 fmtstr(char **sbuffer,
 428        char **buffer,
 429        size_t *currlen,
 430        size_t *maxlen, const char *value, int flags, int min, 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     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
 460 static void
 461 fmtint(char **sbuffer,
 462        char **buffer,
 463        size_t *currlen,
 464        size_t *maxlen, LLONG value, int base, int min, int max, int flags)
 465 {
 466     int signvalue = 0;
 467     const char *prefix = "";
 468     unsigned LLONG uvalue;
 469     char convert[DECIMAL_SIZE(value) + 3];
 470     int place = 0;
 471     int spadlen = 0;
 472     int zpadlen = 0;
 473     int caps = 0;
 474
 475     if (max < 0)
 476         max = 0;
 477     uvalue = value;
 478     if (!(flags & DP_F_UNSIGNED)) {
 479         if (value < 0) {
 480             signvalue = '-';
 481             uvalue = -value;
 482         } else if (flags & DP_F_PLUS)
 483             signvalue = '+';
 484         else if (flags & DP_F_SPACE)
 485             signvalue = ' ';
 486     }
 487     if (flags & DP_F_NUM) {
 488         if (base == 8)
 489             prefix = "0";
 490         if (base == 16)
 491             prefix = "0x";
 492     }
 493     if (flags & DP_F_UP)
 494         caps = 1;
 495     do {
 496         convert[place++] = (caps ? "0123456789ABCDEF" : "0123456789abcdef")
 497             [uvalue % (unsigned)base];
 498         uvalue = (uvalue / (unsigned)base);
 499     } while (uvalue && (place < (int)sizeof(convert)));
 500     if (place == sizeof(convert))
 501         place--;
 502     convert[place] = 0;
 503
 504     zpadlen = max - place;
 505     spadlen =
 506         min - OSSL_MAX(max, place) - (signvalue ? 1 : 0) - strlen(prefix);
 507     if (zpadlen < 0)
 508         zpadlen = 0;
 509     if (spadlen < 0)
 510         spadlen = 0;
 511     if (flags & DP_F_ZERO) {
 512         zpadlen = OSSL_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     /* prefix */
 529     while (*prefix) {
 530         doapr_outch(sbuffer, buffer, currlen, maxlen, *prefix);
 531         prefix++;
 532     }
 533
 534     /* zeros */
 535     if (zpadlen > 0) {
 536         while (zpadlen > 0) {
 537             doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
 538             --zpadlen;
 539         }
 540     }
 541     /* digits */
 542     while (place > 0)
 543         doapr_outch(sbuffer, buffer, currlen, maxlen, convert[--place]);
 544
 545     /* left justified spaces */
 546     while (spadlen < 0) {
 547         doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
 548         ++spadlen;
 549     }
 550     return;
 551 }
 552
 553 static LDOUBLE abs_val(LDOUBLE value)
 554 {
 555     LDOUBLE result = value;
 556     if (value < 0)
 557         result = -value;
 558     return result;
 559 }
 560
 561 static LDOUBLE pow_10(int in_exp)
 562 {
 563     LDOUBLE result = 1;
 564     while (in_exp) {
 565         result *= 10;
 566         in_exp--;
 567     }
 568     return result;
 569 }
 570
 571 static long roundv(LDOUBLE value)
 572 {
 573     long intpart;
 574     intpart = (long)value;
 575     value = value - intpart;
 576     if (value >= 0.5)
 577         intpart++;
 578     return intpart;
 579 }
 580
 581 static void
 582 fmtfp(char **sbuffer,
 583       char **buffer,
 584       size_t *currlen,
 585       size_t *maxlen, LDOUBLE fvalue, int min, int max, int flags)
 586 {
 587     int signvalue = 0;
 588     LDOUBLE ufvalue;
 589     char iconvert[20];
 590     char fconvert[20];
 591     int iplace = 0;
 592     int fplace = 0;
 593     int padlen = 0;
 594     int zpadlen = 0;
 595     long intpart;
 596     long fracpart;
 597     long max10;
 598
 599     if (max < 0)
 600         max = 6;
 601     ufvalue = abs_val(fvalue);
 602     if (fvalue < 0)
 603         signvalue = '-';
 604     else if (flags & DP_F_PLUS)
 605         signvalue = '+';
 606     else if (flags & DP_F_SPACE)
 607         signvalue = ' ';
 608
 609     intpart = (long)ufvalue;
 610
 611     /*
 612      * sorry, we only support 9 digits past the decimal because of our
 613      * conversion method
 614      */
 615     if (max > 9)
 616         max = 9;
 617
 618     /*
 619      * we "cheat" by converting the fractional part to integer by multiplying
 620      * by a factor of 10
 621      */
 622     max10 = roundv(pow_10(max));
 623     fracpart = roundv(pow_10(max) * (ufvalue - intpart));
 624
 625     if (fracpart >= max10) {
 626         intpart++;
 627         fracpart -= max10;
 628     }
 629
 630     /* convert integer part */
 631     do {
 632         iconvert[iplace++] = "0123456789"[intpart % 10];
 633         intpart = (intpart / 10);
 634     } while (intpart && (iplace < (int)sizeof(iconvert)));
 635     if (iplace == sizeof iconvert)
 636         iplace--;
 637     iconvert[iplace] = 0;
 638
 639     /* convert fractional part */
 640     do {
 641         fconvert[fplace++] = "0123456789"[fracpart % 10];
 642         fracpart = (fracpart / 10);
 643     } while (fplace < max);
 644     if (fplace == sizeof fconvert)
 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 || (flags & DP_F_NUM)) {
 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
 700 static void
 701 doapr_outch(char **sbuffer,
 702             char **buffer, size_t *currlen, size_t *maxlen, int c)
 703 {
 704     /* If we haven't at least one buffer, someone has doe a big booboo */
 705     assert(*sbuffer != NULL || buffer != NULL);
 706
 707     /* |currlen| must always be <= |*maxlen| */
 708     assert(*currlen <= *maxlen);
 709
 710     if (buffer && *currlen == *maxlen) {
 711         *maxlen += 1024;
 712         if (*buffer == NULL) {
 713             *buffer = OPENSSL_malloc(*maxlen);
 714             if (!*buffer) {
 715                 /* Panic! Can't really do anything sensible. Just return */
 716                 return;
 717             }
 718             if (*currlen > 0) {
 719                 assert(*sbuffer != NULL);
 720                 memcpy(*buffer, *sbuffer, *currlen);
 721             }
 722             *sbuffer = NULL;
 723         } else {
 724             *buffer = OPENSSL_realloc(*buffer, *maxlen);
 725             if (!*buffer) {
 726                 /* Panic! Can't really do anything sensible. Just return */
 727                 return;
 728             }
 729         }
 730     }
 731
 732     if (*currlen < *maxlen) {
 733         if (*sbuffer)
 734             (*sbuffer)[(*currlen)++] = (char)c;
 735         else
 736             (*buffer)[(*currlen)++] = (char)c;
 737     }
 738
 739     return;
 740 }
 741
 742 /***************************************************************************/
 743
 744 int BIO_printf(BIO *bio, const char *format, ...)
 745 {
 746     va_list args;
 747     int ret;
 748
 749     va_start(args, format);
 750
 751     ret = BIO_vprintf(bio, format, args);
 752
 753     va_end(args);
 754     return (ret);
 755 }
 756
 757 int BIO_vprintf(BIO *bio, const char *format, va_list args)
 758 {
 759     int ret;
 760     size_t retlen;
 761     char hugebuf[1024 * 2];     /* Was previously 10k, which is unreasonable
 762                                  * in small-stack environments, like threads
 763                                  * or DOS programs. */
 764     char *hugebufp = hugebuf;
 765     size_t hugebufsize = sizeof(hugebuf);
 766     char *dynbuf = NULL;
 767     int ignored;
 768
 769     dynbuf = NULL;
 770     CRYPTO_push_info("doapr()");
 771     _dopr(&hugebufp, &dynbuf, &hugebufsize, &retlen, &ignored, format, args);
 772     if (dynbuf) {
 773         ret = BIO_write(bio, dynbuf, (int)retlen);
 774         OPENSSL_free(dynbuf);
 775     } else {
 776         ret = BIO_write(bio, hugebuf, (int)retlen);
 777     }
 778     CRYPTO_pop_info();
 779     return (ret);
 780 }
 781
 782 /*
 783  * As snprintf is not available everywhere, we provide our own
 784  * implementation. This function has nothing to do with BIOs, but it's
 785  * closely related to BIO_printf, and we need *some* name prefix ... (XXX the
 786  * function should be renamed, but to what?)
 787  */
 788 int BIO_snprintf(char *buf, size_t n, const char *format, ...)
 789 {
 790     va_list args;
 791     int ret;
 792
 793     va_start(args, format);
 794
 795     ret = BIO_vsnprintf(buf, n, format, args);
 796
 797     va_end(args);
 798     return (ret);
 799 }
 800
 801 int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
 802 {
 803     size_t retlen;
 804     int truncated;
 805
 806     _dopr(&buf, NULL, &n, &retlen, &truncated, format, args);
 807
 808     if (truncated)
 809         /*
 810          * In case of truncation, return -1 like traditional snprintf.
 811          * (Current drafts for ISO/IEC 9899 say snprintf should return the
 812          * number of characters that would have been written, had the buffer
 813          * been large enough.)
 814          */
 815         return -1;
 816     else
 817         return (retlen <= INT_MAX) ? (int)retlen : -1;
 818 }