crypto/bio/b_print.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 /* disable assert() unless BIO_DEBUG has been defined */
  59 #ifndef BIO_DEBUG
  60 # ifndef NDEBUG
  61 #  define NDEBUG
  62 # endif
  63 #endif
  64
  65 /*
  66  * Stolen from tjh's ssl/ssl_trc.c stuff.
  67  */
  68
  69 #include <stdio.h>
  70 #include <string.h>
  71 #include <ctype.h>
  72 #include <assert.h>
  73 #include <limits.h>
  74 #include "internal/cryptlib.h"
  75 #ifndef NO_SYS_TYPES_H
  76 # include <sys/types.h>
  77 #endif
  78 #include <openssl/bn.h>         /* To get BN_LLONG properly defined */
  79 #include <openssl/bio.h>
  80
  81 #if defined(BN_LLONG) || defined(SIXTY_FOUR_BIT)
  82 # ifndef HAVE_LONG_LONG
  83 #  define HAVE_LONG_LONG 1
  84 # endif
  85 #endif
  86
  87 /***************************************************************************/
  88
  89 /*
  90  * Copyright Patrick Powell 1995
  91  * This code is based on code written by Patrick Powell <papowell@astart.com>
  92  * It may be used for any purpose as long as this notice remains intact
  93  * on all source code distributions.
  94  */
  95
  96 /*-
  97  * This code contains numerious changes and enhancements which were
  98  * made by lots of contributors over the last years to Patrick Powell's
  99  * original code:
 100  *
 101  * o Patrick Powell <papowell@astart.com>      (1995)
 102  * o Brandon Long <blong@fiction.net>          (1996, for Mutt)
 103  * o Thomas Roessler <roessler@guug.de>        (1998, for Mutt)
 104  * o Michael Elkins <me@cs.hmc.edu>            (1998, for Mutt)
 105  * o Andrew Tridgell <tridge@samba.org>        (1998, for Samba)
 106  * o Luke Mewburn <lukem@netbsd.org>           (1999, for LukemFTP)
 107  * o Ralf S. Engelschall <rse@engelschall.com> (1999, for Pth)
 108  * o ...                                       (for OpenSSL)
 109  */
 110
 111 #ifdef HAVE_LONG_DOUBLE
 112 # define LDOUBLE long double
 113 #else
 114 # define LDOUBLE double
 115 #endif
 116
 117 #ifdef HAVE_LONG_LONG
 118 # if defined(_WIN32) && !defined(__GNUC__)
 119 #  define LLONG __int64
 120 # else
 121 #  define LLONG long long
 122 # endif
 123 #else
 124 # define LLONG long
 125 #endif
 126
 127 static void fmtstr(char **, char **, size_t *, size_t *,
 128                    const char *, int, int, int);
 129 static void fmtint(char **, char **, size_t *, size_t *,
 130                    LLONG, int, int, int, int);
 131 static void fmtfp(char **, char **, size_t *, size_t *,
 132                   LDOUBLE, int, int, int);
 133 static void doapr_outch(char **, char **, size_t *, size_t *, int);
 134 static void _dopr(char **sbuffer, char **buffer,
 135                   size_t *maxlen, size_t *retlen, int *truncated,
 136                   const char *format, va_list args);
 137
 138 /* format read states */
 139 #define DP_S_DEFAULT    0
 140 #define DP_S_FLAGS      1
 141 #define DP_S_MIN        2
 142 #define DP_S_DOT        3
 143 #define DP_S_MAX        4
 144 #define DP_S_MOD        5
 145 #define DP_S_CONV       6
 146 #define DP_S_DONE       7
 147
 148 /* format flags - Bits */
 149 #define DP_F_MINUS      (1 << 0)
 150 #define DP_F_PLUS       (1 << 1)
 151 #define DP_F_SPACE      (1 << 2)
 152 #define DP_F_NUM        (1 << 3)
 153 #define DP_F_ZERO       (1 << 4)
 154 #define DP_F_UP         (1 << 5)
 155 #define DP_F_UNSIGNED   (1 << 6)
 156
 157 /* conversion flags */
 158 #define DP_C_SHORT      1
 159 #define DP_C_LONG       2
 160 #define DP_C_LDOUBLE    3
 161 #define DP_C_LLONG      4
 162
 163 /* some handy macros */
 164 #define char_to_int(p) (p - '0')
 165 #define OSSL_MAX(p,q) ((p >= q) ? p : q)
 166
 167 static void
 168 _dopr(char **sbuffer,
 169       char **buffer,
 170       size_t *maxlen,
 171       size_t *retlen, int *truncated, const char *format, va_list args)
 172 {
 173     char ch;
 174     LLONG value;
 175     LDOUBLE fvalue;
 176     char *strvalue;
 177     int min;
 178     int max;
 179     int state;
 180     int flags;
 181     int cflags;
 182     size_t currlen;
 183
 184     state = DP_S_DEFAULT;
 185     flags = currlen = cflags = min = 0;
 186     max = -1;
 187     ch = *format++;
 188
 189     while (state != DP_S_DONE) {
 190         if (ch == '\0' || (buffer == NULL && currlen >= *maxlen))
 191             state = DP_S_DONE;
 192
 193         switch (state) {
 194         case DP_S_DEFAULT:
 195             if (ch == '%')
 196                 state = DP_S_FLAGS;
 197             else
 198                 doapr_outch(sbuffer, buffer, &currlen, maxlen, ch);
 199             ch = *format++;
 200             break;
 201         case DP_S_FLAGS:
 202             switch (ch) {
 203             case '-':
 204                 flags |= DP_F_MINUS;
 205                 ch = *format++;
 206                 break;
 207             case '+':
 208                 flags |= DP_F_PLUS;
 209                 ch = *format++;
 210                 break;
 211             case ' ':
 212                 flags |= DP_F_SPACE;
 213                 ch = *format++;
 214                 break;
 215             case '#':
 216                 flags |= DP_F_NUM;
 217                 ch = *format++;
 218                 break;
 219             case '0':
 220                 flags |= DP_F_ZERO;
 221                 ch = *format++;
 222                 break;
 223             default:
 224                 state = DP_S_MIN;
 225                 break;
 226             }
 227             break;
 228         case DP_S_MIN:
 229             if (isdigit((unsigned char)ch)) {
 230                 min = 10 * min + char_to_int(ch);
 231                 ch = *format++;
 232             } else if (ch == '*') {
 233                 min = va_arg(args, int);
 234                 ch = *format++;
 235                 state = DP_S_DOT;
 236             } else
 237                 state = DP_S_DOT;
 238             break;
 239         case DP_S_DOT:
 240             if (ch == '.') {
 241                 state = DP_S_MAX;
 242                 ch = *format++;
 243             } else
 244                 state = DP_S_MOD;
 245             break;
 246         case DP_S_MAX:
 247             if (isdigit((unsigned char)ch)) {
 248                 if (max < 0)
 249                     max = 0;
 250                 max = 10 * max + char_to_int(ch);
 251                 ch = *format++;
 252             } else if (ch == '*') {
 253                 max = va_arg(args, int);
 254                 ch = *format++;
 255                 state = DP_S_MOD;
 256             } else
 257                 state = DP_S_MOD;
 258             break;
 259         case DP_S_MOD:
 260             switch (ch) {
 261             case 'h':
 262                 cflags = DP_C_SHORT;
 263                 ch = *format++;
 264                 break;
 265             case 'l':
 266                 if (*format == 'l') {
 267                     cflags = DP_C_LLONG;
 268                     format++;
 269                 } else
 270                     cflags = DP_C_LONG;
 271                 ch = *format++;
 272                 break;
 273             case 'q':
 274                 cflags = DP_C_LLONG;
 275                 ch = *format++;
 276                 break;
 277             case 'L':
 278                 cflags = DP_C_LDOUBLE;
 279                 ch = *format++;
 280                 break;
 281             default:
 282                 break;
 283             }
 284             state = DP_S_CONV;
 285             break;
 286         case DP_S_CONV:
 287             switch (ch) {
 288             case 'd':
 289             case 'i':
 290                 switch (cflags) {
 291                 case DP_C_SHORT:
 292                     value = (short int)va_arg(args, int);
 293                     break;
 294                 case DP_C_LONG:
 295                     value = va_arg(args, long int);
 296                     break;
 297                 case DP_C_LLONG:
 298                     value = va_arg(args, LLONG);
 299                     break;
 300                 default:
 301                     value = va_arg(args, int);
 302                     break;
 303                 }
 304                 fmtint(sbuffer, buffer, &currlen, maxlen,
 305                        value, 10, min, max, flags);
 306                 break;
 307             case 'X':
 308                 flags |= DP_F_UP;
 309                 /* FALLTHROUGH */
 310             case 'x':
 311             case 'o':
 312             case 'u':
 313                 flags |= DP_F_UNSIGNED;
 314                 switch (cflags) {
 315                 case DP_C_SHORT:
 316                     value = (unsigned short int)va_arg(args, unsigned int);
 317                     break;
 318                 case DP_C_LONG:
 319                     value = (LLONG) va_arg(args, unsigned long int);
 320                     break;
 321                 case DP_C_LLONG:
 322                     value = va_arg(args, unsigned LLONG);
 323                     break;
 324                 default:
 325                     value = (LLONG) va_arg(args, unsigned int);
 326                     break;
 327                 }
 328                 fmtint(sbuffer, buffer, &currlen, maxlen, value,
 329                        ch == 'o' ? 8 : (ch == 'u' ? 10 : 16),
 330                        min, max, flags);
 331                 break;
 332             case 'f':
 333                 if (cflags == DP_C_LDOUBLE)
 334                     fvalue = va_arg(args, LDOUBLE);
 335                 else
 336                     fvalue = va_arg(args, double);
 337                 fmtfp(sbuffer, buffer, &currlen, maxlen,
 338                       fvalue, min, max, flags);
 339                 break;
 340             case 'E':
 341                 flags |= DP_F_UP;
 342             case 'e':
 343                 if (cflags == DP_C_LDOUBLE)
 344                     fvalue = va_arg(args, LDOUBLE);
 345                 else
 346                     fvalue = va_arg(args, double);
 347                 break;
 348             case 'G':
 349                 flags |= DP_F_UP;
 350             case 'g':
 351                 if (cflags == DP_C_LDOUBLE)
 352                     fvalue = va_arg(args, LDOUBLE);
 353                 else
 354                     fvalue = va_arg(args, double);
 355                 break;
 356             case 'c':
 357                 doapr_outch(sbuffer, buffer, &currlen, maxlen,
 358                             va_arg(args, int));
 359                 break;
 360             case 's':
 361                 strvalue = va_arg(args, char *);
 362                 if (max < 0) {
 363                     if (buffer)
 364                         max = INT_MAX;
 365                     else
 366                         max = *maxlen;
 367                 }
 368                 fmtstr(sbuffer, buffer, &currlen, maxlen, strvalue,
 369                        flags, min, max);
 370                 break;
 371             case 'p':
 372                 value = (size_t)va_arg(args, void *);
 373                 fmtint(sbuffer, buffer, &currlen, maxlen,
 374                        value, 16, min, max, flags | DP_F_NUM);
 375                 break;
 376             case 'n':          /* XXX */
 377                 if (cflags == DP_C_SHORT) {
 378                     short int *num;
 379                     num = va_arg(args, short int *);
 380                     *num = currlen;
 381                 } else if (cflags == DP_C_LONG) { /* XXX */
 382                     long int *num;
 383                     num = va_arg(args, long int *);
 384                     *num = (long int)currlen;
 385                 } else if (cflags == DP_C_LLONG) { /* XXX */
 386                     LLONG *num;
 387                     num = va_arg(args, LLONG *);
 388                     *num = (LLONG) currlen;
 389                 } else {
 390                     int *num;
 391                     num = va_arg(args, int *);
 392                     *num = currlen;
 393                 }
 394                 break;
 395             case '%':
 396                 doapr_outch(sbuffer, buffer, &currlen, maxlen, ch);
 397                 break;
 398             case 'w':
 399                 /* not supported yet, treat as next char */
 400                 ch = *format++;
 401                 break;
 402             default:
 403                 /* unknown, skip */
 404                 break;
 405             }
 406             ch = *format++;
 407             state = DP_S_DEFAULT;
 408             flags = cflags = min = 0;
 409             max = -1;
 410             break;
 411         case DP_S_DONE:
 412             break;
 413         default:
 414             break;
 415         }
 416     }
 417     *truncated = (currlen > *maxlen - 1);
 418     if (*truncated)
 419         currlen = *maxlen - 1;
 420     doapr_outch(sbuffer, buffer, &currlen, maxlen, '\0');
 421     *retlen = currlen - 1;
 422     return;
 423 }
 424
 425 static void
 426 fmtstr(char **sbuffer,
 427        char **buffer,
 428        size_t *currlen,
 429        size_t *maxlen, const char *value, int flags, int min, 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     padlen = min - strln;
 438     if (padlen < 0)
 439         padlen = 0;
 440     if (flags & DP_F_MINUS)
 441         padlen = -padlen;
 442
 443     while ((padlen > 0) && (cnt < max)) {
 444         doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
 445         --padlen;
 446         ++cnt;
 447     }
 448     while (*value && (cnt < max)) {
 449         doapr_outch(sbuffer, buffer, currlen, maxlen, *value++);
 450         ++cnt;
 451     }
 452     while ((padlen < 0) && (cnt < max)) {
 453         doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
 454         ++padlen;
 455         ++cnt;
 456     }
 457 }
 458
 459 static void
 460 fmtint(char **sbuffer,
 461        char **buffer,
 462        size_t *currlen,
 463        size_t *maxlen, LLONG value, int base, int min, int max, int flags)
 464 {
 465     int signvalue = 0;
 466     const char *prefix = "";
 467     unsigned LLONG uvalue;
 468     char convert[DECIMAL_SIZE(value) + 3];
 469     int place = 0;
 470     int spadlen = 0;
 471     int zpadlen = 0;
 472     int caps = 0;
 473
 474     if (max < 0)
 475         max = 0;
 476     uvalue = value;
 477     if (!(flags & DP_F_UNSIGNED)) {
 478         if (value < 0) {
 479             signvalue = '-';
 480             uvalue = -value;
 481         } else if (flags & DP_F_PLUS)
 482             signvalue = '+';
 483         else if (flags & DP_F_SPACE)
 484             signvalue = ' ';
 485     }
 486     if (flags & DP_F_NUM) {
 487         if (base == 8)
 488             prefix = "0";
 489         if (base == 16)
 490             prefix = "0x";
 491     }
 492     if (flags & DP_F_UP)
 493         caps = 1;
 494     do {
 495         convert[place++] = (caps ? "0123456789ABCDEF" : "0123456789abcdef")
 496             [uvalue % (unsigned)base];
 497         uvalue = (uvalue / (unsigned)base);
 498     } while (uvalue && (place < (int)sizeof(convert)));
 499     if (place == sizeof(convert))
 500         place--;
 501     convert[place] = 0;
 502
 503     zpadlen = max - place;
 504     spadlen =
 505         min - OSSL_MAX(max, place) - (signvalue ? 1 : 0) - strlen(prefix);
 506     if (zpadlen < 0)
 507         zpadlen = 0;
 508     if (spadlen < 0)
 509         spadlen = 0;
 510     if (flags & DP_F_ZERO) {
 511         zpadlen = OSSL_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     /* prefix */
 528     while (*prefix) {
 529         doapr_outch(sbuffer, buffer, currlen, maxlen, *prefix);
 530         prefix++;
 531     }
 532
 533     /* zeros */
 534     if (zpadlen > 0) {
 535         while (zpadlen > 0) {
 536             doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
 537             --zpadlen;
 538         }
 539     }
 540     /* digits */
 541     while (place > 0)
 542         doapr_outch(sbuffer, buffer, currlen, maxlen, convert[--place]);
 543
 544     /* left justified spaces */
 545     while (spadlen < 0) {
 546         doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
 547         ++spadlen;
 548     }
 549     return;
 550 }
 551
 552 static LDOUBLE abs_val(LDOUBLE value)
 553 {
 554     LDOUBLE result = value;
 555     if (value < 0)
 556         result = -value;
 557     return result;
 558 }
 559
 560 static LDOUBLE pow_10(int in_exp)
 561 {
 562     LDOUBLE result = 1;
 563     while (in_exp) {
 564         result *= 10;
 565         in_exp--;
 566     }
 567     return result;
 568 }
 569
 570 static long roundv(LDOUBLE value)
 571 {
 572     long intpart;
 573     intpart = (long)value;
 574     value = value - intpart;
 575     if (value >= 0.5)
 576         intpart++;
 577     return intpart;
 578 }
 579
 580 static void
 581 fmtfp(char **sbuffer,
 582       char **buffer,
 583       size_t *currlen,
 584       size_t *maxlen, LDOUBLE fvalue, int min, int max, int flags)
 585 {
 586     int signvalue = 0;
 587     LDOUBLE ufvalue;
 588     char iconvert[20];
 589     char fconvert[20];
 590     int iplace = 0;
 591     int fplace = 0;
 592     int padlen = 0;
 593     int zpadlen = 0;
 594     long intpart;
 595     long fracpart;
 596     long max10;
 597
 598     if (max < 0)
 599         max = 6;
 600     ufvalue = abs_val(fvalue);
 601     if (fvalue < 0)
 602         signvalue = '-';
 603     else if (flags & DP_F_PLUS)
 604         signvalue = '+';
 605     else if (flags & DP_F_SPACE)
 606         signvalue = ' ';
 607
 608     intpart = (long)ufvalue;
 609
 610     /*
 611      * sorry, we only support 9 digits past the decimal because of our
 612      * conversion method
 613      */
 614     if (max > 9)
 615         max = 9;
 616
 617     /*
 618      * we "cheat" by converting the fractional part to integer by multiplying
 619      * by a factor of 10
 620      */
 621     max10 = roundv(pow_10(max));
 622     fracpart = roundv(pow_10(max) * (ufvalue - intpart));
 623
 624     if (fracpart >= max10) {
 625         intpart++;
 626         fracpart -= max10;
 627     }
 628
 629     /* convert integer part */
 630     do {
 631         iconvert[iplace++] = "0123456789"[intpart % 10];
 632         intpart = (intpart / 10);
 633     } while (intpart && (iplace < (int)sizeof(iconvert)));
 634     if (iplace == sizeof iconvert)
 635         iplace--;
 636     iconvert[iplace] = 0;
 637
 638     /* convert fractional part */
 639     do {
 640         fconvert[fplace++] = "0123456789"[fracpart % 10];
 641         fracpart = (fracpart / 10);
 642     } while (fplace < max);
 643     if (fplace == sizeof fconvert)
 644         fplace--;
 645     fconvert[fplace] = 0;
 646
 647     /* -1 for decimal point, another -1 if we are printing a sign */
 648     padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
 649     zpadlen = max - fplace;
 650     if (zpadlen < 0)
 651         zpadlen = 0;
 652     if (padlen < 0)
 653         padlen = 0;
 654     if (flags & DP_F_MINUS)
 655         padlen = -padlen;
 656
 657     if ((flags & DP_F_ZERO) && (padlen > 0)) {
 658         if (signvalue) {
 659             doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
 660             --padlen;
 661             signvalue = 0;
 662         }
 663         while (padlen > 0) {
 664             doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
 665             --padlen;
 666         }
 667     }
 668     while (padlen > 0) {
 669         doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
 670         --padlen;
 671     }
 672     if (signvalue)
 673         doapr_outch(sbuffer, buffer, currlen, maxlen, signvalue);
 674
 675     while (iplace > 0)
 676         doapr_outch(sbuffer, buffer, currlen, maxlen, iconvert[--iplace]);
 677
 678     /*
 679      * Decimal point. This should probably use locale to find the correct
 680      * char to print out.
 681      */
 682     if (max > 0 || (flags & DP_F_NUM)) {
 683         doapr_outch(sbuffer, buffer, currlen, maxlen, '.');
 684
 685         while (fplace > 0)
 686             doapr_outch(sbuffer, buffer, currlen, maxlen, fconvert[--fplace]);
 687     }
 688     while (zpadlen > 0) {
 689         doapr_outch(sbuffer, buffer, currlen, maxlen, '0');
 690         --zpadlen;
 691     }
 692
 693     while (padlen < 0) {
 694         doapr_outch(sbuffer, buffer, currlen, maxlen, ' ');
 695         ++padlen;
 696     }
 697 }
 698
 699 static void
 700 doapr_outch(char **sbuffer,
 701             char **buffer, size_t *currlen, size_t *maxlen, int c)
 702 {
 703     /* If we haven't at least one buffer, someone has doe a big booboo */
 704     assert(*sbuffer != NULL || buffer != NULL);
 705
 706     /* |currlen| must always be <= |*maxlen| */
 707     assert(*currlen <= *maxlen);
 708
 709     if (buffer && *currlen == *maxlen) {
 710         *maxlen += 1024;
 711         if (*buffer == NULL) {
 712             *buffer = OPENSSL_malloc(*maxlen);
 713             if (*buffer == NULL) {
 714                 /* Panic! Can't really do anything sensible. Just return */
 715                 return;
 716             }
 717             if (*currlen > 0) {
 718                 assert(*sbuffer != NULL);
 719                 memcpy(*buffer, *sbuffer, *currlen);
 720             }
 721             *sbuffer = NULL;
 722         } else {
 723             *buffer = OPENSSL_realloc(*buffer, *maxlen);
 724             if (!*buffer) {
 725                 /* Panic! Can't really do anything sensible. Just return */
 726                 return;
 727             }
 728         }
 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
 743 int 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
 756 int BIO_vprintf(BIO *bio, const char *format, va_list args)
 757 {
 758     int ret;
 759     size_t retlen;
 760     char hugebuf[1024 * 2];     /* Was previously 10k, which is unreasonable
 761                                  * in small-stack environments, like threads
 762                                  * or DOS programs. */
 763     char *hugebufp = hugebuf;
 764     size_t hugebufsize = sizeof(hugebuf);
 765     char *dynbuf = NULL;
 766     int ignored;
 767
 768     dynbuf = NULL;
 769     _dopr(&hugebufp, &dynbuf, &hugebufsize, &retlen, &ignored, format, args);
 770     if (dynbuf) {
 771         ret = BIO_write(bio, dynbuf, (int)retlen);
 772         OPENSSL_free(dynbuf);
 773     } else {
 774         ret = BIO_write(bio, hugebuf, (int)retlen);
 775     }
 776     return (ret);
 777 }
 778
 779 /*
 780  * As snprintf is not available everywhere, we provide our own
 781  * implementation. This function has nothing to do with BIOs, but it's
 782  * closely related to BIO_printf, and we need *some* name prefix ... (XXX the
 783  * function should be renamed, but to what?)
 784  */
 785 int BIO_snprintf(char *buf, size_t n, const char *format, ...)
 786 {
 787     va_list args;
 788     int ret;
 789
 790     va_start(args, format);
 791
 792     ret = BIO_vsnprintf(buf, n, format, args);
 793
 794     va_end(args);
 795     return (ret);
 796 }
 797
 798 int BIO_vsnprintf(char *buf, size_t n, const char *format, va_list args)
 799 {
 800     size_t retlen;
 801     int truncated;
 802
 803     _dopr(&buf, NULL, &n, &retlen, &truncated, format, args);
 804
 805     if (truncated)
 806         /*
 807          * In case of truncation, return -1 like traditional snprintf.
 808          * (Current drafts for ISO/IEC 9899 say snprintf should return the
 809          * number of characters that would have been written, had the buffer
 810          * been large enough.)
 811          */
 812         return -1;
 813     else
 814         return (retlen <= INT_MAX) ? (int)retlen : -1;
 815 }