source/lib/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  **************************************************************/
  53
  54 #include "config.h"
  55
  56 #include <string.h>
  57 # include <ctype.h>
  58 #include <sys/types.h>
  59
  60 #if !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF)
  61
  62 /* Define this as a fall through, HAVE_STDARG_H is probably already set */
  63
  64 #define HAVE_VARARGS_H
  65
  66 /* varargs declarations: */
  67
  68 #if defined(HAVE_STDARG_H)
  69 # include <stdarg.h>
  70 # define HAVE_STDARGS    /* let's hope that works everywhere (mj) */
  71 # define VA_LOCAL_DECL   va_list ap
  72 # define VA_START(f)     va_start(ap, f)
  73 # define VA_SHIFT(v,t)  ;   /* no-op for ANSI */
  74 # define VA_END          va_end(ap)
  75 #else
  76 # if defined(HAVE_VARARGS_H)
  77 #  include <varargs.h>
  78 #  undef HAVE_STDARGS
  79 #  define VA_LOCAL_DECL   va_list ap
  80 #  define VA_START(f)     va_start(ap)      /* f is ignored! */
  81 #  define VA_SHIFT(v,t) v = va_arg(ap,t)
  82 #  define VA_END        va_end(ap)
  83 # else
  84 /*XX ** NO VARARGS ** XX*/
  85 # endif
  86 #endif
  87
  88 #ifdef HAVE_LONG_DOUBLE
  89 #define LDOUBLE long double
  90 #else
  91 #define LDOUBLE double
  92 #endif
  93
  94 #ifdef HAVE_LONG_LONG
  95 #define LLONG long long
  96 #else
  97 #define LLONG long
  98 #endif
  99
 100 /*int snprintf (char *str, size_t count, const char *fmt, ...);*/
 101 /*int vsnprintf (char *str, size_t count, const char *fmt, va_list arg);*/
 102
 103 static void dopr (char *buffer, size_t maxlen, const char *format,
 104                   va_list args);
 105 static void fmtstr (char *buffer, size_t *currlen, size_t maxlen,
 106                     char *value, int flags, int min, int max);
 107 static void fmtint (char *buffer, size_t *currlen, size_t maxlen,
 108                     long value, int base, int min, int max, int flags);
 109 static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
 110                    LDOUBLE fvalue, int min, int max, int flags);
 111 static void dopr_outch (char *buffer, size_t *currlen, size_t maxlen, char c );
 112
 113 /*
 114  * dopr(): poor man's version of doprintf
 115  */
 116
 117 /* format read states */
 118 #define DP_S_DEFAULT 0
 119 #define DP_S_FLAGS   1
 120 #define DP_S_MIN     2
 121 #define DP_S_DOT     3
 122 #define DP_S_MAX     4
 123 #define DP_S_MOD     5
 124 #define DP_S_CONV    6
 125 #define DP_S_DONE    7
 126
 127 /* format flags - Bits */
 128 #define DP_F_MINUS      (1 << 0)
 129 #define DP_F_PLUS       (1 << 1)
 130 #define DP_F_SPACE      (1 << 2)
 131 #define DP_F_NUM        (1 << 3)
 132 #define DP_F_ZERO       (1 << 4)
 133 #define DP_F_UP         (1 << 5)
 134 #define DP_F_UNSIGNED   (1 << 6)
 135
 136 /* Conversion Flags */
 137 #define DP_C_SHORT   1
 138 #define DP_C_LONG    2
 139 #define DP_C_LDOUBLE 3
 140 #define DP_C_LLONG   4
 141
 142 #define char_to_int(p) (p - '0')
 143 #define MAX(p,q) ((p >= q) ? p : q)
 144
 145 static void dopr (char *buffer, size_t maxlen, const char *format, va_list args)
 146 {
 147   char ch;
 148   LLONG value;
 149   LDOUBLE fvalue;
 150   char *strvalue;
 151   int min;
 152   int max;
 153   int state;
 154   int flags;
 155   int cflags;
 156   size_t currlen;
 157
 158   state = DP_S_DEFAULT;
 159   currlen = flags = cflags = min = 0;
 160   max = -1;
 161   ch = *format++;
 162
 163   while (state != DP_S_DONE)
 164   {
 165     if ((ch == '\0') || (currlen >= maxlen))
 166       state = DP_S_DONE;
 167
 168     switch(state)
 169     {
 170     case DP_S_DEFAULT:
 171       if (ch == '%')
 172         state = DP_S_FLAGS;
 173       else
 174         dopr_outch (buffer, &currlen, maxlen, ch);
 175       ch = *format++;
 176       break;
 177     case DP_S_FLAGS:
 178       switch (ch)
 179       {
 180       case '-':
 181         flags |= DP_F_MINUS;
 182         ch = *format++;
 183         break;
 184       case '+':
 185         flags |= DP_F_PLUS;
 186         ch = *format++;
 187         break;
 188       case ' ':
 189         flags |= DP_F_SPACE;
 190         ch = *format++;
 191         break;
 192       case '#':
 193         flags |= DP_F_NUM;
 194         ch = *format++;
 195         break;
 196       case '0':
 197         flags |= DP_F_ZERO;
 198         ch = *format++;
 199         break;
 200       default:
 201         state = DP_S_MIN;
 202         break;
 203       }
 204       break;
 205     case DP_S_MIN:
 206       if (isdigit((unsigned char)ch))
 207       {
 208         min = 10*min + char_to_int (ch);
 209         ch = *format++;
 210       }
 211       else if (ch == '*')
 212       {
 213         min = va_arg (args, int);
 214         ch = *format++;
 215         state = DP_S_DOT;
 216       }
 217       else
 218         state = DP_S_DOT;
 219       break;
 220     case DP_S_DOT:
 221       if (ch == '.')
 222       {
 223         state = DP_S_MAX;
 224         ch = *format++;
 225       }
 226       else
 227         state = DP_S_MOD;
 228       break;
 229     case DP_S_MAX:
 230       if (isdigit((unsigned char)ch))
 231       {
 232         if (max < 0)
 233           max = 0;
 234         max = 10*max + char_to_int (ch);
 235         ch = *format++;
 236       }
 237       else if (ch == '*')
 238       {
 239         max = va_arg (args, int);
 240         ch = *format++;
 241         state = DP_S_MOD;
 242       }
 243       else
 244         state = DP_S_MOD;
 245       break;
 246     case DP_S_MOD:
 247       switch (ch)
 248       {
 249       case 'h':
 250         cflags = DP_C_SHORT;
 251         ch = *format++;
 252         break;
 253       case 'l':
 254         cflags = DP_C_LONG;
 255         ch = *format++;
 256         if (ch == 'l') {        /* It's a long long */
 257           cflags = DP_C_LLONG;
 258           ch = *format++;
 259         }
 260         break;
 261       case 'L':
 262         cflags = DP_C_LDOUBLE;
 263         ch = *format++;
 264         break;
 265       default:
 266         break;
 267       }
 268       state = DP_S_CONV;
 269       break;
 270     case DP_S_CONV:
 271       switch (ch)
 272       {
 273       case 'd':
 274       case 'i':
 275         if (cflags == DP_C_SHORT)
 276           value = va_arg (args, short int);
 277         else if (cflags == DP_C_LONG)
 278           value = va_arg (args, long int);
 279         else if (cflags == DP_C_LLONG)
 280           value = va_arg (args, LLONG);
 281         else
 282           value = va_arg (args, int);
 283         fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
 284         break;
 285       case 'o':
 286         flags |= DP_F_UNSIGNED;
 287         if (cflags == DP_C_SHORT)
 288           value = va_arg (args, unsigned short int);
 289         else if (cflags == DP_C_LONG)
 290           value = (long)va_arg (args, unsigned long int);
 291         else if (cflags == DP_C_LLONG)
 292           value = (long)va_arg (args, unsigned LLONG);
 293         else
 294           value = (long)va_arg (args, unsigned int);
 295         fmtint (buffer, &currlen, maxlen, value, 8, min, max, flags);
 296         break;
 297       case 'u':
 298         flags |= DP_F_UNSIGNED;
 299         if (cflags == DP_C_SHORT)
 300           value = va_arg (args, unsigned short int);
 301         else if (cflags == DP_C_LONG)
 302           value = (long)va_arg (args, unsigned long int);
 303         else if (cflags == DP_C_LLONG)
 304           value = (LLONG)va_arg (args, unsigned LLONG);
 305         else
 306           value = (long)va_arg (args, unsigned int);
 307         fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
 308         break;
 309       case 'X':
 310         flags |= DP_F_UP;
 311       case 'x':
 312         flags |= DP_F_UNSIGNED;
 313         if (cflags == DP_C_SHORT)
 314           value = va_arg (args, unsigned short int);
 315         else if (cflags == DP_C_LONG)
 316           value = (long)va_arg (args, unsigned long int);
 317         else if (cflags == DP_C_LLONG)
 318           value = (LLONG)va_arg (args, unsigned LLONG);
 319         else
 320           value = (long)va_arg (args, unsigned int);
 321         fmtint (buffer, &currlen, maxlen, value, 16, min, max, flags);
 322         break;
 323       case 'f':
 324         if (cflags == DP_C_LDOUBLE)
 325           fvalue = va_arg (args, LDOUBLE);
 326         else
 327           fvalue = va_arg (args, double);
 328         /* um, floating point? */
 329         fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags);
 330         break;
 331       case 'E':
 332         flags |= DP_F_UP;
 333       case 'e':
 334         if (cflags == DP_C_LDOUBLE)
 335           fvalue = va_arg (args, LDOUBLE);
 336         else
 337           fvalue = va_arg (args, double);
 338         break;
 339       case 'G':
 340         flags |= DP_F_UP;
 341       case 'g':
 342         if (cflags == DP_C_LDOUBLE)
 343           fvalue = va_arg (args, LDOUBLE);
 344         else
 345           fvalue = va_arg (args, double);
 346         break;
 347       case 'c':
 348         dopr_outch (buffer, &currlen, maxlen, va_arg (args, int));
 349         break;
 350       case 's':
 351         strvalue = va_arg (args, char *);
 352         if (max < 0)
 353           max = maxlen; /* ie, no max */
 354         fmtstr (buffer, &currlen, maxlen, strvalue, flags, min, max);
 355         break;
 356       case 'p':
 357         strvalue = va_arg (args, void *);
 358         fmtint (buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
 359         break;
 360       case 'n':
 361         if (cflags == DP_C_SHORT)
 362         {
 363           short int *num;
 364           num = va_arg (args, short int *);
 365           *num = currlen;
 366         }
 367         else if (cflags == DP_C_LONG)
 368         {
 369           long int *num;
 370           num = va_arg (args, long int *);
 371           *num = (long int)currlen;
 372         }
 373         else if (cflags == DP_C_LLONG)
 374         {
 375           LLONG *num;
 376           num = va_arg (args, LLONG *);
 377           *num = (LLONG)currlen;
 378         }
 379         else
 380         {
 381           int *num;
 382           num = va_arg (args, int *);
 383           *num = currlen;
 384         }
 385         break;
 386       case '%':
 387         dopr_outch (buffer, &currlen, maxlen, ch);
 388         break;
 389       case 'w':
 390         /* not supported yet, treat as next char */
 391         ch = *format++;
 392         break;
 393       default:
 394         /* Unknown, skip */
 395         break;
 396       }
 397       ch = *format++;
 398       state = DP_S_DEFAULT;
 399       flags = cflags = min = 0;
 400       max = -1;
 401       break;
 402     case DP_S_DONE:
 403       break;
 404     default:
 405       /* hmm? */
 406       break; /* some picky compilers need this */
 407     }
 408   }
 409   if (currlen < maxlen - 1)
 410     buffer[currlen] = '\0';
 411   else
 412     buffer[maxlen - 1] = '\0';
 413 }
 414
 415 static void fmtstr (char *buffer, size_t *currlen, size_t maxlen,
 416                     char *value, int flags, int min, int max)
 417 {
 418   int padlen, strln;     /* amount to pad */
 419   int cnt = 0;
 420
 421   if (value == 0)
 422   {
 423     value = "<NULL>";
 424   }
 425
 426   for (strln = 0; value[strln]; ++strln); /* strlen */
 427   padlen = min - strln;
 428   if (padlen < 0)
 429     padlen = 0;
 430   if (flags & DP_F_MINUS)
 431     padlen = -padlen; /* Left Justify */
 432
 433   while ((padlen > 0) && (cnt < max))
 434   {
 435     dopr_outch (buffer, currlen, maxlen, ' ');
 436     --padlen;
 437     ++cnt;
 438   }
 439   while (*value && (cnt < max))
 440   {
 441     dopr_outch (buffer, currlen, maxlen, *value++);
 442     ++cnt;
 443   }
 444   while ((padlen < 0) && (cnt < max))
 445   {
 446     dopr_outch (buffer, currlen, maxlen, ' ');
 447     ++padlen;
 448     ++cnt;
 449   }
 450 }
 451
 452 /* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
 453
 454 static void fmtint (char *buffer, size_t *currlen, size_t maxlen,
 455                     long value, int base, int min, int max, int flags)
 456 {
 457   int signvalue = 0;
 458   unsigned long uvalue;
 459   char convert[20];
 460   int place = 0;
 461   int spadlen = 0; /* amount to space pad */
 462   int zpadlen = 0; /* amount to zero pad */
 463   int caps = 0;
 464
 465   if (max < 0)
 466     max = 0;
 467
 468   uvalue = value;
 469
 470   if(!(flags & DP_F_UNSIGNED))
 471   {
 472     if( value < 0 ) {
 473       signvalue = '-';
 474       uvalue = -value;
 475     }
 476     else
 477       if (flags & DP_F_PLUS)  /* Do a sign (+/i) */
 478         signvalue = '+';
 479     else
 480       if (flags & DP_F_SPACE)
 481         signvalue = ' ';
 482   }
 483
 484   if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
 485
 486   do {
 487     convert[place++] =
 488       (caps? "0123456789ABCDEF":"0123456789abcdef")
 489       [uvalue % (unsigned)base  ];
 490     uvalue = (uvalue / (unsigned)base );
 491   } while(uvalue && (place < 20));
 492   if (place == 20) place--;
 493   convert[place] = 0;
 494
 495   zpadlen = max - place;
 496   spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
 497   if (zpadlen < 0) zpadlen = 0;
 498   if (spadlen < 0) spadlen = 0;
 499   if (flags & DP_F_ZERO)
 500   {
 501     zpadlen = MAX(zpadlen, spadlen);
 502     spadlen = 0;
 503   }
 504   if (flags & DP_F_MINUS)
 505     spadlen = -spadlen; /* Left Justifty */
 506
 507 #ifdef DEBUG_SNPRINTF
 508   printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
 509          zpadlen, spadlen, min, max, place);
 510 #endif
 511
 512   /* Spaces */
 513   while (spadlen > 0)
 514   {
 515     dopr_outch (buffer, currlen, maxlen, ' ');
 516     --spadlen;
 517   }
 518
 519   /* Sign */
 520   if (signvalue)
 521     dopr_outch (buffer, currlen, maxlen, signvalue);
 522
 523   /* Zeros */
 524   if (zpadlen > 0)
 525   {
 526     while (zpadlen > 0)
 527     {
 528       dopr_outch (buffer, currlen, maxlen, '0');
 529       --zpadlen;
 530     }
 531   }
 532
 533   /* Digits */
 534   while (place > 0)
 535     dopr_outch (buffer, currlen, maxlen, convert[--place]);
 536
 537   /* Left Justified spaces */
 538   while (spadlen < 0) {
 539     dopr_outch (buffer, currlen, maxlen, ' ');
 540     ++spadlen;
 541   }
 542 }
 543
 544 static LDOUBLE abs_val (LDOUBLE value)
 545 {
 546   LDOUBLE result = value;
 547
 548   if (value < 0)
 549     result = -value;
 550
 551   return result;
 552 }
 553
 554 static LDOUBLE pow10 (int exp)
 555 {
 556   LDOUBLE result = 1;
 557
 558   while (exp)
 559   {
 560     result *= 10;
 561     exp--;
 562   }
 563
 564   return result;
 565 }
 566
 567 static long round (LDOUBLE value)
 568 {
 569   long intpart;
 570
 571   intpart = (long)value;
 572   value = value - intpart;
 573   if (value >= 0.5)
 574     intpart++;
 575
 576   return intpart;
 577 }
 578
 579 static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
 580                    LDOUBLE fvalue, int min, int max, int flags)
 581 {
 582   int signvalue = 0;
 583   LDOUBLE ufvalue;
 584 #ifndef HAVE_FCVT
 585   char iconvert[20];
 586   char fconvert[20];
 587 #else
 588   char iconvert[311];
 589   char fconvert[311];
 590   char *result;
 591   int dec_pt, sig;
 592   int r_length;
 593 # ifdef HAVE_FCVTL
 594   extern char *fcvtl(long double value, int ndigit, int *decpt, int *sign);
 595 # else
 596   extern char *fcvt(double value, int ndigit, int *decpt, int *sign);
 597 # endif
 598 #endif
 599   int iplace = 0;
 600   int fplace = 0;
 601   int padlen = 0; /* amount to pad */
 602   int zpadlen = 0;
 603   int caps = 0;
 604   long intpart;
 605   long fracpart;
 606
 607   /*
 608    * AIX manpage says the default is 0, but Solaris says the default
 609    * is 6, and sprintf on AIX defaults to 6
 610    */
 611   if (max < 0)
 612     max = 6;
 613
 614   ufvalue = abs_val (fvalue);
 615
 616   if (fvalue < 0)
 617     signvalue = '-';
 618   else
 619     if (flags & DP_F_PLUS)  /* Do a sign (+/i) */
 620       signvalue = '+';
 621     else
 622       if (flags & DP_F_SPACE)
 623         signvalue = ' ';
 624
 625 #if 0
 626   if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
 627 #endif
 628
 629 #ifndef HAVE_FCVT
 630   intpart = (long)ufvalue;
 631
 632   /*
 633    * Sorry, we only support 9 digits past the decimal because of our
 634    * conversion method
 635    */
 636   if (max > 9)
 637     max = 9;
 638
 639   /* We "cheat" by converting the fractional part to integer by
 640    * multiplying by a factor of 10
 641    */
 642   fracpart = round ((pow10 (max)) * (ufvalue - intpart));
 643
 644   if (fracpart >= pow10 (max))
 645   {
 646     intpart++;
 647     fracpart -= pow10 (max);
 648   }
 649
 650 #ifdef DEBUG_SNPRINTF
 651   printf("fmtfp: %g %d.%d min=%d max=%d\n",
 652          (double)fvalue, intpart, fracpart, min, max);
 653 #endif
 654
 655   /* Convert integer part */
 656   do {
 657     iconvert[iplace++] =
 658       (caps? "0123456789ABCDEF":"0123456789abcdef")[intpart % 10];
 659     intpart = (intpart / 10);
 660   } while(intpart && (iplace < 20));
 661   if (iplace == 20) iplace--;
 662   iconvert[iplace] = 0;
 663
 664   /* Convert fractional part */
 665   do {
 666     fconvert[fplace++] =
 667       (caps? "0123456789ABCDEF":"0123456789abcdef")[fracpart % 10];
 668     fracpart = (fracpart / 10);
 669   } while(fracpart && (fplace < 20));
 670   if (fplace == 20) fplace--;
 671   fconvert[fplace] = 0;
 672 #else  /* use fcvt() */
 673   if (max > 310)
 674     max = 310;
 675 # ifdef HAVE_FCVTL
 676   result = fcvtl(ufvalue, max, &dec_pt, &sig);
 677 # else
 678   result = fcvt(ufvalue, max, &dec_pt, &sig);
 679 # endif
 680
 681   r_length = strlen(result);
 682
 683   /*
 684    * Fix broken fcvt implementation returns..
 685    */
 686
 687   if (r_length == 0)
 688     {
 689       result[0] = '0';
 690       result[1] = '\0';
 691       r_length = 1;
 692     }
 693
 694   if ( r_length < dec_pt )
 695     dec_pt = r_length;
 696
 697   if (dec_pt <= 0) {
 698     iplace = 1;
 699     iconvert[0] = '0';
 700     iconvert[1] = '\0';
 701
 702     fplace = 0;
 703
 704     while(r_length)
 705       fconvert[fplace++] = result[--r_length];
 706
 707     while ((dec_pt < 0) && (fplace < max)) {
 708                 fconvert[fplace++] = '0';
 709                 dec_pt++;
 710         }
 711   } else {
 712     int c;
 713
 714     iplace=0;
 715     for(c=dec_pt; c; iconvert[iplace++] = result[--c])
 716                 ;
 717     iconvert[iplace] = '\0';
 718
 719     result += dec_pt;
 720     fplace = 0;
 721
 722     for(c=(r_length-dec_pt); c; fconvert[fplace++] = result[--c])
 723                 ;
 724   }
 725 #endif /* fcvt */
 726
 727   /* -1 for decimal point, another -1 if we are printing a sign */
 728   padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
 729   zpadlen = max - fplace;
 730   if (zpadlen < 0)
 731     zpadlen = 0;
 732   if (padlen < 0)
 733     padlen = 0;
 734   if (flags & DP_F_MINUS)
 735     padlen = -padlen; /* Left Justifty */
 736
 737   if ((flags & DP_F_ZERO) && (padlen > 0))
 738   {
 739     if (signvalue)
 740     {
 741       dopr_outch (buffer, currlen, maxlen, signvalue);
 742       --padlen;
 743       signvalue = 0;
 744     }
 745     while (padlen > 0)
 746     {
 747       dopr_outch (buffer, currlen, maxlen, '0');
 748       --padlen;
 749     }
 750   }
 751   while (padlen > 0)
 752   {
 753     dopr_outch (buffer, currlen, maxlen, ' ');
 754     --padlen;
 755   }
 756   if (signvalue)
 757     dopr_outch (buffer, currlen, maxlen, signvalue);
 758
 759   while (iplace > 0)
 760     dopr_outch (buffer, currlen, maxlen, iconvert[--iplace]);
 761
 762
 763 #ifdef DEBUG_SNPRINTF
 764   printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen);
 765 #endif
 766
 767   /*
 768    * Decimal point.  This should probably use locale to find the correct
 769    * char to print out.
 770    */
 771   if (max > 0) {
 772           dopr_outch (buffer, currlen, maxlen, '.');
 773
 774           while (fplace > 0)
 775                   dopr_outch (buffer, currlen, maxlen, fconvert[--fplace]);
 776   }
 777
 778   while (zpadlen > 0)
 779   {
 780     dopr_outch (buffer, currlen, maxlen, '0');
 781     --zpadlen;
 782   }
 783
 784   while (padlen < 0)
 785   {
 786     dopr_outch (buffer, currlen, maxlen, ' ');
 787     ++padlen;
 788   }
 789 }
 790
 791 static void dopr_outch (char *buffer, size_t *currlen, size_t maxlen, char c)
 792 {
 793   if (*currlen < maxlen)
 794     buffer[(*currlen)++] = c;
 795 }
 796 #endif /* !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF) */
 797
 798 #ifndef HAVE_VSNPRINTF
 799  int vsnprintf (char *str, size_t count, const char *fmt, va_list args)
 800 {
 801   str[0] = 0;
 802   dopr(str, count, fmt, args);
 803   return(strlen(str));
 804 }
 805 #endif /* !HAVE_VSNPRINTF */
 806
 807 #ifndef HAVE_SNPRINTF
 808 /* VARARGS3 */
 809 #ifdef HAVE_STDARGS
 810  int snprintf (char *str,size_t count,const char *fmt,...)
 811 #else
 812  int snprintf (va_alist) va_dcl
 813 #endif
 814 {
 815 #ifndef HAVE_STDARGS
 816   char *str;
 817   size_t count;
 818   char *fmt;
 819 #endif
 820   VA_LOCAL_DECL;
 821
 822   VA_START (fmt);
 823   VA_SHIFT (str, char *);
 824   VA_SHIFT (count, size_t );
 825   VA_SHIFT (fmt, char *);
 826   (void) vsnprintf(str, count, fmt, ap);
 827   VA_END;
 828   return(strlen(str));
 829 }
 830
 831
 832 #else
 833  /* keep compilers happy about empty files */
 834  void dummy_snprintf(void) {}
 835 #endif /* !HAVE_SNPRINTF */
 836
 837 #ifdef TEST_SNPRINTF
 838 #ifndef LONG_STRING
 839 #define LONG_STRING 1024
 840 #endif
 841  int main (void)
 842 {
 843   char buf1[LONG_STRING];
 844   char buf2[LONG_STRING];
 845   char *fp_fmt[] = {
 846     "%-1.5f",
 847     "%1.5f",
 848     "%123.9f",
 849     "%10.5f",
 850     "% 10.5f",
 851     "%+22.9f",
 852     "%+4.9f",
 853     "%01.3f",
 854     "%4f",
 855     "%3.1f",
 856     "%3.2f",
 857     "%.0f",
 858     "%.1f",
 859     NULL
 860   };
 861   double fp_nums[] = { -1.5, 134.21, 91340.2, 341.1234, 0203.9, 0.96, 0.996,
 862     0.9996, 1.996, 4.136, 6442452944.1234, 0};
 863   char *int_fmt[] = {
 864     "%-1.5d",
 865     "%1.5d",
 866     "%123.9d",
 867     "%5.5d",
 868     "%10.5d",
 869     "% 10.5d",
 870     "%+22.33d",
 871     "%01.3d",
 872     "%4d",
 873     NULL
 874   };
 875   long int_nums[] = { -1, 134, 91340, 341, 0203, 0};
 876   int x, y;
 877   int fail = 0;
 878   int num = 0;
 879
 880   printf ("Testing snprintf format codes against system sprintf...\n");
 881
 882   for (x = 0; fp_fmt[x] != NULL ; x++)
 883     for (y = 0; fp_nums[y] != 0 ; y++)
 884     {
 885       snprintf (buf1, sizeof (buf1), fp_fmt[x], fp_nums[y]);
 886       sprintf (buf2, fp_fmt[x], fp_nums[y]);
 887       if (strcmp (buf1, buf2))
 888       {
 889         printf("snprintf doesn't match Format: %s\n\tsnprintf = %s\n\tsprintf  = %s\n",
 890             fp_fmt[x], buf1, buf2);
 891         fail++;
 892       }
 893       num++;
 894     }
 895
 896   for (x = 0; int_fmt[x] != NULL ; x++)
 897     for (y = 0; int_nums[y] != 0 ; y++)
 898     {
 899       snprintf (buf1, sizeof (buf1), int_fmt[x], int_nums[y]);
 900       sprintf (buf2, int_fmt[x], int_nums[y]);
 901       if (strcmp (buf1, buf2))
 902       {
 903         printf("snprintf doesn't match Format: %s\n\tsnprintf = %s\n\tsprintf  = %s\n",
 904             int_fmt[x], buf1, buf2);
 905         fail++;
 906       }
 907       num++;
 908     }
 909   printf ("%d tests failed out of %d.\n", fail, num);
 910 }
 911 #endif /* SNPRINTF_TEST */
 912