WINGs/snprintf.c

   1 /*
   2  * Copyright Patrick Powell 1995
   3  * This code is based on code written by Patrick Powell (papowell@astart.com)
   4  * It may be used for any purpose as long as this notice remains intact
   5  * on all source code distributions
   6  */
   7
   8 /**************************************************************
   9  * Original:
  10  * Patrick Powell Tue Apr 11 09:48:21 PDT 1995
  11  * A bombproof version of doprnt (dopr) included.
  12  * Sigh.  This sort of thing is always nasty do deal with.  Note that
  13  * the version here does not include floating point...
  14  *
  15  * snprintf() is used instead of sprintf() as it does limit checks
  16  * for string length.  This covers a nasty loophole.
  17  *
  18  * The other functions are there to prevent NULL pointers from
  19  * causing nast effects.
  20  *
  21  * More Recently:
  22  *  Brandon Long <blong@fiction.net> 9/15/96 for mutt 0.43
  23  *  This was ugly.  It is still ugly.  I opted out of floating point
  24  *  numbers, but the formatter understands just about everything
  25  *  from the normal C string format, at least as far as I can tell from
  26  *  the Solaris 2.5 printf(3S) man page.
  27  *
  28  *  Brandon Long <blong@fiction.net> 10/22/97 for mutt 0.87.1
  29  *    Ok, added some minimal floating point support, which means this
  30  *    probably requires libm on most operating systems.  Don't yet
  31  *    support the exponent (e,E) and sigfig (g,G).  Also, fmtint()
  32  *    was pretty badly broken, it just wasn't being exercised in ways
  33  *    which showed it, so that's been fixed.  Also, formated the code
  34  *    to mutt conventions, and removed dead code left over from the
  35  *    original.  Also, there is now a builtin-test, just compile with:
  36  *           gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm
  37  *    and run snprintf for results.
  38  *
  39  *  Thomas Roessler <roessler@guug.de> 01/27/98 for mutt 0.89i
  40  *    The PGP code was using unsigned hexadecimal formats.
  41  *    Unfortunately, unsigned formats simply didn't work.
  42  *
  43  *  Michael Elkins <me@cs.hmc.edu> 03/05/98 for mutt 0.90.8
  44  *    The original code assumed that both snprintf() and vsnprintf() were
  45  *    missing.  Some systems only have snprintf() but not vsnprintf(), so
  46  *    the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF.
  47  *
  48  *  Andrew Tridgell (tridge@samba.org) Oct 1998
  49  *    fixed handling of %.0f
  50  *    added test for HAVE_LONG_DOUBLE
  51  *
  52  * tridge@samba.org, idra@samba.org, April 2001
  53  *    got rid of fcvt code (twas buggy and made testing harder)
  54  *    added C99 semantics
  55  *
  56  **************************************************************/
  57
  58 #ifndef NO_CONFIG_H /* for some tests */
  59 #include "config.h"
  60 #endif
  61
  62 #ifdef HAVE_STRING_H
  63 #include <string.h>
  64 #endif
  65
  66 #ifdef HAVE_STRINGS_H
  67 #include <strings.h>
  68 #endif
  69 #ifdef HAVE_CTYPE_H
  70 #include <ctype.h>
  71 #endif
  72 #include <sys/types.h>
  73 #include <stdarg.h>
  74 #ifdef HAVE_STDLIB_H
  75 #include <stdlib.h>
  76 #endif
  77
  78 #if defined(HAVE_SNPRINTF) && defined(HAVE_VSNPRINTF) && defined(HAVE_C99_VSNPRINTF)
  79 /* only include stdio.h if we are not re-defining snprintf or vsnprintf */
  80 #include <stdio.h>
  81 /* make the compiler happy with an empty file */
  82 void dummy_snprintf(void) {}
  83 #else
  84
  85 #ifdef HAVE_LONG_DOUBLE
  86 #define LDOUBLE long double
  87 #else
  88 #define LDOUBLE double
  89 #endif
  90
  91 #ifdef HAVE_LONG_LONG
  92 #define LLONG long long
  93 #else
  94 #define LLONG long
  95 #endif
  96
  97 static size_t dopr(char *buffer, size_t maxlen, const char *format,
  98                    va_list args);
  99 static void fmtstr(char *buffer, size_t *currlen, size_t maxlen,
 100                    char *value, int flags, int min, int max);
 101 static void fmtint(char *buffer, size_t *currlen, size_t maxlen,
 102                    long value, int base, int min, int max, int flags);
 103 static void fmtfp(char *buffer, size_t *currlen, size_t maxlen,
 104                   LDOUBLE fvalue, int min, int max, int flags);
 105 static void dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c);
 106
 107 /*
 108  * dopr(): poor man's version of doprintf
 109  */
 110
 111 /* format read states */
 112 #define DP_S_DEFAULT 0
 113 #define DP_S_FLAGS   1
 114 #define DP_S_MIN     2
 115 #define DP_S_DOT     3
 116 #define DP_S_MAX     4
 117 #define DP_S_MOD     5
 118 #define DP_S_CONV    6
 119 #define DP_S_DONE    7
 120
 121 /* format flags - Bits */
 122 #define DP_F_MINUS      (1 << 0)
 123 #define DP_F_PLUS       (1 << 1)
 124 #define DP_F_SPACE      (1 << 2)
 125 #define DP_F_NUM        (1 << 3)
 126 #define DP_F_ZERO       (1 << 4)
 127 #define DP_F_UP         (1 << 5)
 128 #define DP_F_UNSIGNED   (1 << 6)
 129
 130 /* Conversion Flags */
 131 #define DP_C_SHORT   1
 132 #define DP_C_LONG    2
 133 #define DP_C_LDOUBLE 3
 134 #define DP_C_LLONG   4
 135
 136 #define char_to_int(p) ((p)- '0')
 137 #ifndef MAX
 138 #define MAX(p,q) (((p) >= (q)) ? (p) : (q))
 139 #endif
 140
 141 static size_t dopr(char *buffer, size_t maxlen, const char *format, va_list args)
 142 {
 143     char ch;
 144     LLONG value;
 145     LDOUBLE fvalue;
 146     char *strvalue;
 147     int min;
 148     int max;
 149     int state;
 150     int flags;
 151     int cflags;
 152     size_t currlen;
 153
 154     state = DP_S_DEFAULT;
 155     currlen = flags = cflags = min = 0;
 156     max = -1;
 157     ch = *format++;
 158
 159     while (state != DP_S_DONE) {
 160         if (ch == '\0')
 161             state = DP_S_DONE;
 162
 163         switch(state) {
 164         case DP_S_DEFAULT:
 165             if (ch == '%')
 166                 state = DP_S_FLAGS;
 167             else
 168                 dopr_outch (buffer, &currlen, maxlen, ch);
 169             ch = *format++;
 170             break;
 171         case DP_S_FLAGS:
 172             switch (ch) {
 173             case '-':
 174                 flags |= DP_F_MINUS;
 175                 ch = *format++;
 176                 break;
 177             case '+':
 178                 flags |= DP_F_PLUS;
 179                 ch = *format++;
 180                 break;
 181             case ' ':
 182                 flags |= DP_F_SPACE;
 183                 ch = *format++;
 184                 break;
 185             case '#':
 186                 flags |= DP_F_NUM;
 187                 ch = *format++;
 188                 break;
 189             case '0':
 190                 flags |= DP_F_ZERO;
 191                 ch = *format++;
 192                 break;
 193             default:
 194                 state = DP_S_MIN;
 195                 break;
 196             }
 197             break;
 198         case DP_S_MIN:
 199             if (isdigit((unsigned char)ch)) {
 200                 min = 10*min + char_to_int (ch);
 201                 ch = *format++;
 202             } else if (ch == '*') {
 203                 min = va_arg (args, int);
 204                 ch = *format++;
 205                 state = DP_S_DOT;
 206             } else {
 207                 state = DP_S_DOT;
 208             }
 209             break;
 210         case DP_S_DOT:
 211             if (ch == '.') {
 212                 state = DP_S_MAX;
 213                 ch = *format++;
 214             } else {
 215                 state = DP_S_MOD;
 216             }
 217             break;
 218         case DP_S_MAX:
 219             if (isdigit((unsigned char)ch)) {
 220                 if (max < 0)
 221                     max = 0;
 222                 max = 10*max + char_to_int (ch);
 223                 ch = *format++;
 224             } else if (ch == '*') {
 225                 max = va_arg (args, int);
 226                 ch = *format++;
 227                 state = DP_S_MOD;
 228             } else {
 229                 state = DP_S_MOD;
 230             }
 231             break;
 232         case DP_S_MOD:
 233             switch (ch) {
 234             case 'h':
 235                 cflags = DP_C_SHORT;
 236                 ch = *format++;
 237                 break;
 238             case 'l':
 239                 cflags = DP_C_LONG;
 240                 ch = *format++;
 241                 if (ch == 'l') {        /* It's a long long */
 242                     cflags = DP_C_LLONG;
 243                     ch = *format++;
 244                 }
 245                 break;
 246             case 'L':
 247                 cflags = DP_C_LDOUBLE;
 248                 ch = *format++;
 249                 break;
 250             default:
 251                 break;
 252             }
 253             state = DP_S_CONV;
 254             break;
 255         case DP_S_CONV:
 256             switch (ch) {
 257             case 'd':
 258             case 'i':
 259                 if (cflags == DP_C_SHORT)
 260                     value = va_arg (args, int);
 261                 else if (cflags == DP_C_LONG)
 262                     value = va_arg (args, long int);
 263                 else if (cflags == DP_C_LLONG)
 264                     value = va_arg (args, LLONG);
 265                 else
 266                     value = va_arg (args, int);
 267                 fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
 268                 break;
 269             case 'o':
 270                 flags |= DP_F_UNSIGNED;
 271                 if (cflags == DP_C_SHORT)
 272                     value = va_arg (args, unsigned int);
 273                 else if (cflags == DP_C_LONG)
 274                     value = (long)va_arg (args, unsigned long int);
 275                 else if (cflags == DP_C_LLONG)
 276                     value = (long)va_arg (args, unsigned LLONG);
 277                 else
 278                     value = (long)va_arg (args, unsigned int);
 279                 fmtint (buffer, &currlen, maxlen, value, 8, min, max, flags);
 280                 break;
 281             case 'u':
 282                 flags |= DP_F_UNSIGNED;
 283                 if (cflags == DP_C_SHORT)
 284                     value = va_arg (args, unsigned int);
 285                 else if (cflags == DP_C_LONG)
 286                     value = (long)va_arg (args, unsigned long int);
 287                 else if (cflags == DP_C_LLONG)
 288                     value = (LLONG)va_arg (args, unsigned LLONG);
 289                 else
 290                     value = (long)va_arg (args, unsigned int);
 291                 fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
 292                 break;
 293             case 'X':
 294                 flags |= DP_F_UP;
 295             case 'x':
 296                 flags |= DP_F_UNSIGNED;
 297                 if (cflags == DP_C_SHORT)
 298                     value = va_arg (args, unsigned int);
 299                 else if (cflags == DP_C_LONG)
 300                     value = (long)va_arg (args, unsigned long int);
 301                 else if (cflags == DP_C_LLONG)
 302                     value = (LLONG)va_arg (args, unsigned LLONG);
 303                 else
 304                     value = (long)va_arg (args, unsigned int);
 305                 fmtint (buffer, &currlen, maxlen, value, 16, min, max, flags);
 306                 break;
 307             case 'f':
 308                 if (cflags == DP_C_LDOUBLE)
 309                     fvalue = va_arg (args, LDOUBLE);
 310                 else
 311                     fvalue = va_arg (args, double);
 312                 /* um, floating point? */
 313                 fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags);
 314                 break;
 315             case 'E':
 316                 flags |= DP_F_UP;
 317             case 'e':
 318                 if (cflags == DP_C_LDOUBLE)
 319                     fvalue = va_arg (args, LDOUBLE);
 320                 else
 321                     fvalue = va_arg (args, double);
 322                 break;
 323             case 'G':
 324                 flags |= DP_F_UP;
 325             case 'g':
 326                 if (cflags == DP_C_LDOUBLE)
 327                     fvalue = va_arg (args, LDOUBLE);
 328                 else
 329                     fvalue = va_arg (args, double);
 330                 break;
 331             case 'c':
 332                 dopr_outch (buffer, &currlen, maxlen, va_arg (args, int));
 333                 break;
 334             case 's':
 335                 strvalue = va_arg (args, char *);
 336                 if (max == -1) {
 337                     max = strlen(strvalue);
 338                 }
 339                 if (min > 0 && max >= 0 && min > max) max = min;
 340                 fmtstr (buffer, &currlen, maxlen, strvalue, flags, min, max);
 341                 break;
 342             case 'p':
 343                 strvalue = va_arg (args, void *);
 344                 fmtint (buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
 345                 break;
 346             case 'n':
 347                 if (cflags == DP_C_SHORT) {
 348                     short int *num;
 349                     num = va_arg (args, short int *);
 350                     *num = currlen;
 351                 } else if (cflags == DP_C_LONG) {
 352                     long int *num;
 353                     num = va_arg (args, long int *);
 354                     *num = (long int)currlen;
 355                 } else if (cflags == DP_C_LLONG) {
 356                     LLONG *num;
 357                     num = va_arg (args, LLONG *);
 358                     *num = (LLONG)currlen;
 359                 } else {
 360                     int *num;
 361                     num = va_arg (args, int *);
 362                     *num = currlen;
 363                 }
 364                 break;
 365             case '%':
 366                 dopr_outch (buffer, &currlen, maxlen, ch);
 367                 break;
 368             case 'w':
 369                 /* not supported yet, treat as next char */
 370                 ch = *format++;
 371                 break;
 372             default:
 373                 /* Unknown, skip */
 374                 break;
 375             }
 376             ch = *format++;
 377             state = DP_S_DEFAULT;
 378             flags = cflags = min = 0;
 379             max = -1;
 380             break;
 381         case DP_S_DONE:
 382             break;
 383         default:
 384             /* hmm? */
 385             break; /* some picky compilers need this */
 386         }
 387     }
 388     if (maxlen != 0) {
 389         if (currlen < maxlen - 1)
 390             buffer[currlen] = '\0';
 391         else if (maxlen > 0)
 392             buffer[maxlen - 1] = '\0';
 393     }
 394
 395     return currlen;
 396 }
 397
 398 static void fmtstr(char *buffer, size_t *currlen, size_t maxlen,
 399                    char *value, int flags, int min, int max)
 400 {
 401     int padlen, strln;     /* amount to pad */
 402     int cnt = 0;
 403
 404 #ifdef DEBUG_SNPRINTF
 405     printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value);
 406 #endif
 407     if (value == 0) {
 408         value = "<NULL>";
 409     }
 410
 411     for (strln = 0; value[strln]; ++strln); /* strlen */
 412     padlen = min - strln;
 413     if (padlen < 0)
 414         padlen = 0;
 415     if (flags & DP_F_MINUS)
 416         padlen = -padlen; /* Left Justify */
 417
 418     while ((padlen > 0) && (cnt < max)) {
 419         dopr_outch (buffer, currlen, maxlen, ' ');
 420         --padlen;
 421         ++cnt;
 422     }
 423     while (*value && (cnt < max)) {
 424         dopr_outch (buffer, currlen, maxlen, *value++);
 425         ++cnt;
 426     }
 427     while ((padlen < 0) && (cnt < max)) {
 428         dopr_outch (buffer, currlen, maxlen, ' ');
 429         ++padlen;
 430         ++cnt;
 431     }
 432 }
 433
 434 /* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
 435
 436 static void fmtint(char *buffer, size_t *currlen, size_t maxlen,
 437                    long value, int base, int min, int max, int flags)
 438 {
 439     int signvalue = 0;
 440     unsigned long uvalue;
 441     char convert[20];
 442     int place = 0;
 443     int spadlen = 0; /* amount to space pad */
 444     int zpadlen = 0; /* amount to zero pad */
 445     int caps = 0;
 446
 447     if (max < 0)
 448         max = 0;
 449
 450     uvalue = value;
 451
 452     if(!(flags & DP_F_UNSIGNED)) {
 453         if( value < 0 ) {
 454             signvalue = '-';
 455             uvalue = -value;
 456         } else {
 457             if (flags & DP_F_PLUS)  /* Do a sign (+/i) */
 458                 signvalue = '+';
 459             else if (flags & DP_F_SPACE)
 460                 signvalue = ' ';
 461         }
 462     }
 463
 464     if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
 465
 466     do {
 467         convert[place++] =
 468             (caps? "0123456789ABCDEF":"0123456789abcdef")
 469             [uvalue % (unsigned)base  ];
 470         uvalue = (uvalue / (unsigned)base );
 471     } while(uvalue && (place < 20));
 472     if (place == 20) place--;
 473     convert[place] = 0;
 474
 475     zpadlen = max - place;
 476     spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
 477     if (zpadlen < 0) zpadlen = 0;
 478     if (spadlen < 0) spadlen = 0;
 479     if (flags & DP_F_ZERO) {
 480         zpadlen = MAX(zpadlen, spadlen);
 481         spadlen = 0;
 482     }
 483     if (flags & DP_F_MINUS)
 484         spadlen = -spadlen; /* Left Justifty */
 485
 486 #ifdef DEBUG_SNPRINTF
 487     printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
 488            zpadlen, spadlen, min, max, place);
 489 #endif
 490
 491     /* Spaces */
 492     while (spadlen > 0) {
 493         dopr_outch (buffer, currlen, maxlen, ' ');
 494         --spadlen;
 495     }
 496
 497     /* Sign */
 498     if (signvalue)
 499         dopr_outch (buffer, currlen, maxlen, signvalue);
 500
 501     /* Zeros */
 502     if (zpadlen > 0) {
 503         while (zpadlen > 0) {
 504             dopr_outch (buffer, currlen, maxlen, '0');
 505             --zpadlen;
 506         }
 507     }
 508
 509     /* Digits */
 510     while (place > 0)
 511         dopr_outch (buffer, currlen, maxlen, convert[--place]);
 512
 513     /* Left Justified spaces */
 514     while (spadlen < 0) {
 515         dopr_outch (buffer, currlen, maxlen, ' ');
 516         ++spadlen;
 517     }
 518 }
 519
 520 static LDOUBLE abs_val(LDOUBLE value)
 521 {
 522     LDOUBLE result = value;
 523
 524     if (value < 0)
 525         result = -value;
 526
 527     return result;
 528 }
 529
 530 static LDOUBLE POW10(int exp)
 531 {
 532     LDOUBLE result = 1;
 533
 534     while (exp) {
 535         result *= 10;
 536         exp--;
 537     }
 538
 539     return result;
 540 }
 541
 542 static LLONG ROUND(LDOUBLE value)
 543 {
 544     LLONG intpart;
 545
 546     intpart = (LLONG)value;
 547     value = value - intpart;
 548     if (value >= 0.5) intpart++;
 549
 550     return intpart;
 551 }
 552
 553 /* a replacement for modf that doesn't need the math library. Should
 554  be portable, but slow */
 555 static double my_modf(double x0, double *iptr)
 556 {
 557     int i;
 558     long l;
 559     double x = x0;
 560     double f = 1.0;
 561
 562     for (i=0;i<100;i++) {
 563         l = (long)x;
 564         if (l <= (x+1) && l >= (x-1)) break;
 565         x *= 0.1;
 566         f *= 10.0;
 567     }
 568
 569     if (i == 100) {
 570         /* yikes! the number is beyond what we can handle. What do we do? */
 571         (*iptr) = 0;
 572         return 0;
 573     }
 574
 575     if (i != 0) {
 576         double i2;
 577         double ret;
 578
 579         ret = my_modf(x0-l*f, &i2);
 580         (*iptr) = l*f + i2;
 581         return ret;
 582     }
 583
 584     (*iptr) = l;
 585     return x - (*iptr);
 586 }
 587
 588
 589 static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
 590                    LDOUBLE fvalue, int min, int max, int flags)
 591 {
 592     int signvalue = 0;
 593     double ufvalue;
 594     char iconvert[311];
 595     char fconvert[311];
 596     int iplace = 0;
 597     int fplace = 0;
 598     int padlen = 0; /* amount to pad */
 599     int zpadlen = 0;
 600     int caps = 0;
 601     int index;
 602     double intpart;
 603     double fracpart;
 604     double temp;
 605
 606     /*
 607      * AIX manpage says the default is 0, but Solaris says the default
 608      * is 6, and sprintf on AIX defaults to 6
 609      */
 610     if (max < 0)
 611         max = 6;
 612
 613     ufvalue = abs_val (fvalue);
 614
 615     if (fvalue < 0) {
 616         signvalue = '-';
 617     } else {
 618         if (flags & DP_F_PLUS) { /* Do a sign (+/i) */
 619             signvalue = '+';
 620         } else {
 621             if (flags & DP_F_SPACE)
 622                 signvalue = ' ';
 623         }
 624     }
 625
 626 #if 0
 627     if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
 628 #endif
 629
 630 #if 0
 631     if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */
 632 #endif
 633
 634     /*
 635      * Sorry, we only support 16 digits past the decimal because of our
 636      * conversion method
 637      */
 638     if (max > 16)
 639         max = 16;
 640
 641     /* We "cheat" by converting the fractional part to integer by
 642      * multiplying by a factor of 10
 643      */
 644
 645     temp = ufvalue;
 646     my_modf(temp, &intpart);
 647
 648     fracpart = ROUND((POW10(max)) * (ufvalue - intpart));
 649
 650     if (fracpart >= POW10(max)) {
 651         intpart++;
 652         fracpart -= POW10(max);
 653     }
 654
 655
 656     /* Convert integer part */
 657     do {
 658         temp = intpart;
 659         my_modf(intpart*0.1, &intpart);
 660         temp = temp*0.1;
 661         index = (int) ((temp -intpart +0.05)* 10.0);
 662         /* index = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */
 663         /* printf ("%llf, %f, %x\n", temp, intpart, index); */
 664         iconvert[iplace++] =
 665             (caps? "0123456789ABCDEF":"0123456789abcdef")[index];
 666     } while (intpart && (iplace < 311));
 667     if (iplace == 311) iplace--;
 668     iconvert[iplace] = 0;
 669
 670     /* Convert fractional part */
 671     if (fracpart)
 672     {
 673         do {
 674             temp = fracpart;
 675             my_modf(fracpart*0.1, &fracpart);
 676             temp = temp*0.1;
 677             index = (int) ((temp -fracpart +0.05)* 10.0);
 678             /* index = (int) ((((temp/10) -fracpart) +0.05) *10); */
 679             /* printf ("%lf, %lf, %ld\n", temp, fracpart, index); */
 680             fconvert[fplace++] =
 681                 (caps? "0123456789ABCDEF":"0123456789abcdef")[index];
 682         } while(fracpart && (fplace < 311));
 683         if (fplace == 311) fplace--;
 684     }
 685     fconvert[fplace] = 0;
 686
 687     /* -1 for decimal point, another -1 if we are printing a sign */
 688     padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
 689     zpadlen = max - fplace;
 690     if (zpadlen < 0) zpadlen = 0;
 691     if (padlen < 0)
 692         padlen = 0;
 693     if (flags & DP_F_MINUS)
 694         padlen = -padlen; /* Left Justifty */
 695
 696     if ((flags & DP_F_ZERO) && (padlen > 0)) {
 697         if (signvalue) {
 698             dopr_outch (buffer, currlen, maxlen, signvalue);
 699             --padlen;
 700             signvalue = 0;
 701         }
 702         while (padlen > 0) {
 703             dopr_outch (buffer, currlen, maxlen, '0');
 704             --padlen;
 705         }
 706     }
 707     while (padlen > 0) {
 708         dopr_outch (buffer, currlen, maxlen, ' ');
 709         --padlen;
 710     }
 711     if (signvalue)
 712         dopr_outch (buffer, currlen, maxlen, signvalue);
 713
 714     while (iplace > 0)
 715         dopr_outch (buffer, currlen, maxlen, iconvert[--iplace]);
 716
 717 #ifdef DEBUG_SNPRINTF
 718     printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen);
 719 #endif
 720
 721     /*
 722      * Decimal point.  This should probably use locale to find the correct
 723      * char to print out.
 724      */
 725     if (max > 0) {
 726         dopr_outch (buffer, currlen, maxlen, '.');
 727
 728         while (fplace > 0)
 729             dopr_outch (buffer, currlen, maxlen, fconvert[--fplace]);
 730     }
 731
 732     while (zpadlen > 0) {
 733         dopr_outch (buffer, currlen, maxlen, '0');
 734         --zpadlen;
 735     }
 736
 737     while (padlen < 0) {
 738         dopr_outch (buffer, currlen, maxlen, ' ');
 739         ++padlen;
 740     }
 741 }
 742
 743 static void dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c)
 744 {
 745     if (*currlen < maxlen) {
 746         buffer[(*currlen)] = c;
 747     }
 748     (*currlen)++;
 749 }
 750
 751 #if !defined(HAVE_VSNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 752 int vsnprintf (char *str, size_t count, const char *fmt, va_list args)
 753 {
 754     return dopr(str, count, fmt, args);
 755 }
 756 #endif
 757
 758 #if !defined(HAVE_SNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 759 int snprintf(char *str,size_t count,const char *fmt,...)
 760 {
 761     size_t ret;
 762     va_list ap;
 763
 764     va_start(ap, fmt);
 765     ret = vsnprintf(str, count, fmt, ap);
 766     va_end(ap);
 767     return ret;
 768 }
 769 #endif
 770
 771 #endif
 772
 773 #ifndef HAVE_VASPRINTF
 774 int vasprintf(char **ptr, const char *format, va_list ap)
 775 {
 776     int ret;
 777
 778     ret = vsnprintf(NULL, 0, format, ap);
 779     if (ret <= 0) return ret;
 780
 781     (*ptr) = (char *)malloc(ret+1);
 782     if (!*ptr) return -1;
 783     ret = vsnprintf(*ptr, ret+1, format, ap);
 784
 785     return ret;
 786 }
 787 #endif
 788
 789
 790 #ifndef HAVE_ASPRINTF
 791 int asprintf(char **ptr, const char *format, ...)
 792 {
 793     va_list ap;
 794     int ret;
 795
 796     va_start(ap, format);
 797     ret = vasprintf(ptr, format, ap);
 798     va_end(ap);
 799
 800     return ret;
 801 }
 802 #endif
 803
 804 #ifdef TEST_SNPRINTF
 805
 806 int sprintf(char *str,const char *fmt,...);
 807
 808 int main (void)
 809 {
 810     char buf1[1024];
 811     char buf2[1024];
 812     char *fp_fmt[] = {
 813         "%1.1f",
 814         "%-1.5f",
 815         "%1.5f",
 816         "%123.9f",
 817         "%10.5f",
 818         "% 10.5f",
 819         "%+22.9f",
 820         "%+4.9f",
 821         "%01.3f",
 822         "%4f",
 823         "%3.1f",
 824         "%3.2f",
 825         "%.0f",
 826         "%f",
 827         "-16.16f",
 828         NULL
 829     };
 830     double fp_nums[] = { 6442452944.1234, -1.5, 134.21, 91340.2, 341.1234, 0203.9, 0.96, 0.996,
 831     0.9996, 1.996, 4.136,  0};
 832     char *int_fmt[] = {
 833         "%-1.5d",
 834         "%1.5d",
 835         "%123.9d",
 836         "%5.5d",
 837         "%10.5d",
 838         "% 10.5d",
 839         "%+22.33d",
 840         "%01.3d",
 841         "%4d",
 842         "%d",
 843         NULL
 844     };
 845     long int_nums[] = { -1, 134, 91340, 341, 0203, 0};
 846     char *str_fmt[] = {
 847         "10.5s",
 848         "5.10s",
 849         "10.1s",
 850         "0.10s",
 851         "10.0s",
 852         "1.10s",
 853         "%s",
 854         "%.1s",
 855         "%.10s",
 856         "%10s",
 857         NULL
 858     };
 859     char *str_vals[] = {"hello", "a", "", "a longer string", NULL};
 860     int x, y;
 861     int fail = 0;
 862     int num = 0;
 863
 864     printf ("Testing snprintf format codes against system sprintf...\n");
 865
 866     for (x = 0; fp_fmt[x] ; x++) {
 867         for (y = 0; fp_nums[y] != 0 ; y++) {
 868             int l1 = snprintf(NULL, 0, fp_fmt[x], fp_nums[y]);
 869             int l2 = snprintf(buf1, sizeof(buf1), fp_fmt[x], fp_nums[y]);
 870             sprintf (buf2, fp_fmt[x], fp_nums[y]);
 871             if (strcmp (buf1, buf2)) {
 872                 printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n",
 873                        fp_fmt[x], buf1, buf2);
 874                 fail++;
 875             }
 876             if (l1 != l2) {
 877                 printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, fp_fmt[x]);
 878                 fail++;
 879             }
 880             num++;
 881         }
 882     }
 883
 884     for (x = 0; int_fmt[x] ; x++) {
 885         for (y = 0; int_nums[y] != 0 ; y++) {
 886             int l1 = snprintf(NULL, 0, int_fmt[x], int_nums[y]);
 887             int l2 = snprintf(buf1, sizeof(buf1), int_fmt[x], int_nums[y]);
 888             sprintf (buf2, int_fmt[x], int_nums[y]);
 889             if (strcmp (buf1, buf2)) {
 890                 printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n",
 891                        int_fmt[x], buf1, buf2);
 892                 fail++;
 893             }
 894             if (l1 != l2) {
 895                 printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, int_fmt[x]);
 896                 fail++;
 897             }
 898             num++;
 899         }
 900     }
 901
 902     for (x = 0; str_fmt[x] ; x++) {
 903         for (y = 0; str_vals[y] != 0 ; y++) {
 904             int l1 = snprintf(NULL, 0, str_fmt[x], str_vals[y]);
 905             int l2 = snprintf(buf1, sizeof(buf1), str_fmt[x], str_vals[y]);
 906             sprintf (buf2, str_fmt[x], str_vals[y]);
 907             if (strcmp (buf1, buf2)) {
 908                 printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n",
 909                        str_fmt[x], buf1, buf2);
 910                 fail++;
 911             }
 912             if (l1 != l2) {
 913                 printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, str_fmt[x]);
 914                 fail++;
 915             }
 916             num++;
 917         }
 918     }
 919
 920     printf ("%d tests failed out of %d.\n", fail, num);
 921
 922     printf("seeing how many digits we support\n");
 923     {
 924         double v0 = 0.12345678901234567890123456789012345678901;
 925         for (x=0; x<100; x++) {
 926             snprintf(buf1, sizeof(buf1), "%1.1f", v0*pow(10, x));
 927             sprintf(buf2,                "%1.1f", v0*pow(10, x));
 928             if (strcmp(buf1, buf2)) {
 929                 printf("we seem to support %d digits\n", x-1);
 930                 break;
 931             }
 932         }
 933     }
 934
 935     return 0;
 936 }
 937 #endif /* SNPRINTF_TEST */
 938