lib/snprintf.c

   1 /*
   2  * NOTE: If you change this file, please merge it into rsync, samba, etc.
   3  */
   4
   5 /*
   6  * Copyright Patrick Powell 1995
   7  * This code is based on code written by Patrick Powell (papowell@astart.com)
   8  * It may be used for any purpose as long as this notice remains intact
   9  * on all source code distributions
  10  */
  11
  12 /**************************************************************
  13  * Original:
  14  * Patrick Powell Tue Apr 11 09:48:21 PDT 1995
  15  * A bombproof version of doprnt (dopr) included.
  16  * Sigh.  This sort of thing is always nasty do deal with.  Note that
  17  * the version here does not include floating point...
  18  *
  19  * snprintf() is used instead of sprintf() as it does limit checks
  20  * for string length.  This covers a nasty loophole.
  21  *
  22  * The other functions are there to prevent NULL pointers from
  23  * causing nast effects.
  24  *
  25  * More Recently:
  26  *  Brandon Long <blong@fiction.net> 9/15/96 for mutt 0.43
  27  *  This was ugly.  It is still ugly.  I opted out of floating point
  28  *  numbers, but the formatter understands just about everything
  29  *  from the normal C string format, at least as far as I can tell from
  30  *  the Solaris 2.5 printf(3S) man page.
  31  *
  32  *  Brandon Long <blong@fiction.net> 10/22/97 for mutt 0.87.1
  33  *    Ok, added some minimal floating point support, which means this
  34  *    probably requires libm on most operating systems.  Don't yet
  35  *    support the exponent (e,E) and sigfig (g,G).  Also, fmtint()
  36  *    was pretty badly broken, it just wasn't being exercised in ways
  37  *    which showed it, so that's been fixed.  Also, formated the code
  38  *    to mutt conventions, and removed dead code left over from the
  39  *    original.  Also, there is now a builtin-test, just compile with:
  40  *           gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm
  41  *    and run snprintf for results.
  42  *
  43  *  Thomas Roessler <roessler@guug.de> 01/27/98 for mutt 0.89i
  44  *    The PGP code was using unsigned hexadecimal formats.
  45  *    Unfortunately, unsigned formats simply didn't work.
  46  *
  47  *  Michael Elkins <me@cs.hmc.edu> 03/05/98 for mutt 0.90.8
  48  *    The original code assumed that both snprintf() and vsnprintf() were
  49  *    missing.  Some systems only have snprintf() but not vsnprintf(), so
  50  *    the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF.
  51  *
  52  *  Andrew Tridgell (tridge@samba.org) Oct 1998
  53  *    fixed handling of %.0f
  54  *    added test for HAVE_LONG_DOUBLE
  55  *
  56  * tridge@samba.org, idra@samba.org, April 2001
  57  *    got rid of fcvt code (twas buggy and made testing harder)
  58  *    added C99 semantics
  59  *
  60  * date: 2002/12/19 19:56:31;  author: herb;  state: Exp;  lines: +2 -0
  61  * actually print args for %g and %e
  62  *
  63  * date: 2002/06/03 13:37:52;  author: jmcd;  state: Exp;  lines: +8 -0
  64  * Since includes.h isn't included here, VA_COPY has to be defined here.  I don't
  65  * see any include file that is guaranteed to be here, so I'm defining it
  66  * locally.  Fixes AIX and Solaris builds.
  67  *
  68  * date: 2002/06/03 03:07:24;  author: tridge;  state: Exp;  lines: +5 -13
  69  * put the ifdef for HAVE_VA_COPY in one place rather than in lots of
  70  * functions
  71  *
  72  * date: 2002/05/17 14:51:22;  author: jmcd;  state: Exp;  lines: +21 -4
  73  * Fix usage of va_list passed as an arg.  Use __va_copy before using it
  74  * when it exists.
  75  *
  76  * date: 2002/04/16 22:38:04;  author: idra;  state: Exp;  lines: +20 -14
  77  * Fix incorrect zpadlen handling in fmtfp.
  78  * Thanks to Ollie Oldham <ollie.oldham@metro-optix.com> for spotting it.
  79  * few mods to make it easier to compile the tests.
  80  * addedd the "Ollie" test to the floating point ones.
  81  *
  82  * Martin Pool (mbp@samba.org) April 2003
  83  *    Remove NO_CONFIG_H so that the test case can be built within a source
  84  *    tree with less trouble.
  85  *    Remove unnecessary SAFE_FREE() definition.
  86  *
  87  * Martin Pool (mbp@samba.org) May 2003
  88  *    Put in a prototype for dummy_snprintf() to quiet compiler warnings.
  89  *
  90  *    Move #endif to make sure VA_COPY, LDOUBLE, etc are defined even
  91  *    if the C library has some snprintf functions already.
  92  **************************************************************/
  93
  94 #ifndef NO_CONFIG_H
  95 #include "config.h"
  96 #else
  97 #define NULL 0
  98 #endif
  99
 100 #ifdef TEST_SNPRINTF /* need math library headers for testing */
 101
 102 /* In test mode, we pretend that this system doesn't have any snprintf
 103  * functions, regardless of what config.h says. */
 104 #  undef HAVE_SNPRINTF
 105 #  undef HAVE_VSNPRINTF
 106 #  undef HAVE_C99_VSNPRINTF
 107 #  undef HAVE_ASPRINTF
 108 #  undef HAVE_VASPRINTF
 109 #  include <math.h>
 110 #endif /* TEST_SNPRINTF */
 111
 112 #ifdef HAVE_STRING_H
 113 #include <string.h>
 114 #endif
 115
 116 #ifdef HAVE_STRINGS_H
 117 #include <strings.h>
 118 #endif
 119 #ifdef HAVE_CTYPE_H
 120 #include <ctype.h>
 121 #endif
 122 #include <sys/types.h>
 123 #include <stdarg.h>
 124 #ifdef HAVE_STDLIB_H
 125 #include <stdlib.h>
 126 #endif
 127
 128 #if defined(HAVE_SNPRINTF) && defined(HAVE_VSNPRINTF) && defined(HAVE_C99_VSNPRINTF)
 129 /* only include stdio.h if we are not re-defining snprintf or vsnprintf */
 130 #include <stdio.h>
 131  /* make the compiler happy with an empty file */
 132  void dummy_snprintf(void);
 133  void dummy_snprintf(void) {}
 134 #endif /* HAVE_SNPRINTF, etc */
 135
 136 #ifdef HAVE_LONG_DOUBLE
 137 #define LDOUBLE long double
 138 #else
 139 #define LDOUBLE double
 140 #endif
 141
 142 #if SIZEOF_LONG_LONG
 143 #define LLONG long long
 144 #else
 145 #define LLONG long
 146 #endif
 147
 148 #ifndef VA_COPY
 149 #if defined HAVE_VA_COPY || defined va_copy
 150 #define VA_COPY(dest, src) va_copy(dest, src)
 151 #else
 152 #ifdef HAVE___VA_COPY
 153 #define VA_COPY(dest, src) __va_copy(dest, src)
 154 #else
 155 #define VA_COPY(dest, src) (dest) = (src)
 156 #endif
 157 #endif
 158
 159 /*
 160  * dopr(): poor man's version of doprintf
 161  */
 162
 163 /* format read states */
 164 #define DP_S_DEFAULT 0
 165 #define DP_S_FLAGS   1
 166 #define DP_S_MIN     2
 167 #define DP_S_DOT     3
 168 #define DP_S_MAX     4
 169 #define DP_S_MOD     5
 170 #define DP_S_CONV    6
 171 #define DP_S_DONE    7
 172
 173 /* format flags - Bits */
 174 #define DP_F_MINUS      (1 << 0)
 175 #define DP_F_PLUS       (1 << 1)
 176 #define DP_F_SPACE      (1 << 2)
 177 #define DP_F_NUM        (1 << 3)
 178 #define DP_F_ZERO       (1 << 4)
 179 #define DP_F_UP         (1 << 5)
 180 #define DP_F_UNSIGNED   (1 << 6)
 181
 182 /* Conversion Flags */
 183 #define DP_C_SHORT   1
 184 #define DP_C_LONG    2
 185 #define DP_C_LDOUBLE 3
 186 #define DP_C_LLONG   4
 187
 188 #define char_to_int(p) ((p)- '0')
 189 #ifndef MAX
 190 #define MAX(p,q) (((p) >= (q)) ? (p) : (q))
 191 #endif
 192
 193 /* yes this really must be a ||. Don't muck with this (tridge) */
 194 #if !defined(HAVE_VSNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 195
 196 static size_t dopr(char *buffer, size_t maxlen, const char *format,
 197                    va_list args_in);
 198 static void fmtstr(char *buffer, size_t *currlen, size_t maxlen,
 199                     char *value, int flags, int min, int max);
 200 static void fmtint(char *buffer, size_t *currlen, size_t maxlen,
 201                     long value, int base, int min, int max, int flags);
 202 static void fmtfp(char *buffer, size_t *currlen, size_t maxlen,
 203                    LDOUBLE fvalue, int min, int max, int flags);
 204 static void dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c);
 205
 206 static size_t dopr(char *buffer, size_t maxlen, const char *format, va_list args_in)
 207 {
 208         char ch;
 209         LLONG value;
 210         LDOUBLE fvalue;
 211         char *strvalue;
 212         int min;
 213         int max;
 214         int state;
 215         int flags;
 216         int cflags;
 217         size_t currlen;
 218         va_list args;
 219
 220         VA_COPY(args, args_in);
 221
 222         state = DP_S_DEFAULT;
 223         currlen = flags = cflags = min = 0;
 224         max = -1;
 225         ch = *format++;
 226
 227         while (state != DP_S_DONE) {
 228                 if (ch == '\0')
 229                         state = DP_S_DONE;
 230
 231                 switch(state) {
 232                 case DP_S_DEFAULT:
 233                         if (ch == '%')
 234                                 state = DP_S_FLAGS;
 235                         else
 236                                 dopr_outch (buffer, &currlen, maxlen, ch);
 237                         ch = *format++;
 238                         break;
 239                 case DP_S_FLAGS:
 240                         switch (ch) {
 241                         case '-':
 242                                 flags |= DP_F_MINUS;
 243                                 ch = *format++;
 244                                 break;
 245                         case '+':
 246                                 flags |= DP_F_PLUS;
 247                                 ch = *format++;
 248                                 break;
 249                         case ' ':
 250                                 flags |= DP_F_SPACE;
 251                                 ch = *format++;
 252                                 break;
 253                         case '#':
 254                                 flags |= DP_F_NUM;
 255                                 ch = *format++;
 256                                 break;
 257                         case '0':
 258                                 flags |= DP_F_ZERO;
 259                                 ch = *format++;
 260                                 break;
 261                         default:
 262                                 state = DP_S_MIN;
 263                                 break;
 264                         }
 265                         break;
 266                 case DP_S_MIN:
 267                         if (isdigit((unsigned char)ch)) {
 268                                 min = 10*min + char_to_int (ch);
 269                                 ch = *format++;
 270                         } else if (ch == '*') {
 271                                 min = va_arg (args, int);
 272                                 ch = *format++;
 273                                 state = DP_S_DOT;
 274                         } else {
 275                                 state = DP_S_DOT;
 276                         }
 277                         break;
 278                 case DP_S_DOT:
 279                         if (ch == '.') {
 280                                 state = DP_S_MAX;
 281                                 ch = *format++;
 282                         } else {
 283                                 state = DP_S_MOD;
 284                         }
 285                         break;
 286                 case DP_S_MAX:
 287                         if (isdigit((unsigned char)ch)) {
 288                                 if (max < 0)
 289                                         max = 0;
 290                                 max = 10*max + char_to_int (ch);
 291                                 ch = *format++;
 292                         } else if (ch == '*') {
 293                                 max = va_arg (args, int);
 294                                 ch = *format++;
 295                                 state = DP_S_MOD;
 296                         } else {
 297                                 state = DP_S_MOD;
 298                         }
 299                         break;
 300                 case DP_S_MOD:
 301                         switch (ch) {
 302                         case 'h':
 303                                 cflags = DP_C_SHORT;
 304                                 ch = *format++;
 305                                 break;
 306                         case 'l':
 307                                 cflags = DP_C_LONG;
 308                                 ch = *format++;
 309                                 if (ch == 'l') {        /* It's a long long */
 310                                         cflags = DP_C_LLONG;
 311                                         ch = *format++;
 312                                 }
 313                                 break;
 314                         case 'L':
 315                                 cflags = DP_C_LDOUBLE;
 316                                 ch = *format++;
 317                                 break;
 318                         default:
 319                                 break;
 320                         }
 321                         state = DP_S_CONV;
 322                         break;
 323                 case DP_S_CONV:
 324                         switch (ch) {
 325                         case 'd':
 326                         case 'i':
 327                                 if (cflags == DP_C_SHORT)
 328                                         value = va_arg (args, int);
 329                                 else if (cflags == DP_C_LONG)
 330                                         value = va_arg (args, long int);
 331                                 else if (cflags == DP_C_LLONG)
 332                                         value = va_arg (args, LLONG);
 333                                 else
 334                                         value = va_arg (args, int);
 335                                 fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
 336                                 break;
 337                         case 'o':
 338                                 flags |= DP_F_UNSIGNED;
 339                                 if (cflags == DP_C_SHORT)
 340                                         value = va_arg (args, unsigned int);
 341                                 else if (cflags == DP_C_LONG)
 342                                         value = (long)va_arg (args, unsigned long int);
 343                                 else if (cflags == DP_C_LLONG)
 344                                         value = (long)va_arg (args, unsigned LLONG);
 345                                 else
 346                                         value = (long)va_arg (args, unsigned int);
 347                                 fmtint (buffer, &currlen, maxlen, value, 8, min, max, flags);
 348                                 break;
 349                         case 'u':
 350                                 flags |= DP_F_UNSIGNED;
 351                                 if (cflags == DP_C_SHORT)
 352                                         value = va_arg (args, unsigned int);
 353                                 else if (cflags == DP_C_LONG)
 354                                         value = (long)va_arg (args, unsigned long int);
 355                                 else if (cflags == DP_C_LLONG)
 356                                         value = (LLONG)va_arg (args, unsigned LLONG);
 357                                 else
 358                                         value = (long)va_arg (args, unsigned int);
 359                                 fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
 360                                 break;
 361                         case 'X':
 362                                 flags |= DP_F_UP;
 363                         case 'x':
 364                                 flags |= DP_F_UNSIGNED;
 365                                 if (cflags == DP_C_SHORT)
 366                                         value = va_arg (args, unsigned int);
 367                                 else if (cflags == DP_C_LONG)
 368                                         value = (long)va_arg (args, unsigned long int);
 369                                 else if (cflags == DP_C_LLONG)
 370                                         value = (LLONG)va_arg (args, unsigned LLONG);
 371                                 else
 372                                         value = (long)va_arg (args, unsigned int);
 373                                 fmtint (buffer, &currlen, maxlen, value, 16, min, max, flags);
 374                                 break;
 375                         case 'f':
 376                                 if (cflags == DP_C_LDOUBLE)
 377                                         fvalue = va_arg (args, LDOUBLE);
 378                                 else
 379                                         fvalue = va_arg (args, double);
 380                                 /* um, floating point? */
 381                                 fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags);
 382                                 break;
 383                         case 'E':
 384                                 flags |= DP_F_UP;
 385                         case 'e':
 386                                 if (cflags == DP_C_LDOUBLE)
 387                                         fvalue = va_arg (args, LDOUBLE);
 388                                 else
 389                                         fvalue = va_arg (args, double);
 390                                 fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags);
 391                                 break;
 392                         case 'G':
 393                                 flags |= DP_F_UP;
 394                         case 'g':
 395                                 if (cflags == DP_C_LDOUBLE)
 396                                         fvalue = va_arg (args, LDOUBLE);
 397                                 else
 398                                         fvalue = va_arg (args, double);
 399                                 fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags);
 400                                 break;
 401                         case 'c':
 402                                 dopr_outch (buffer, &currlen, maxlen, va_arg (args, int));
 403                                 break;
 404                         case 's':
 405                                 strvalue = va_arg (args, char *);
 406                                 if (!strvalue) strvalue = "(NULL)";
 407                                 if (max == -1) {
 408                                         max = strlen(strvalue);
 409                                 }
 410                                 if (min > 0 && max >= 0 && min > max) max = min;
 411                                 fmtstr (buffer, &currlen, maxlen, strvalue, flags, min, max);
 412                                 break;
 413                         case 'p':
 414                                 strvalue = va_arg (args, void *);
 415                                 fmtint (buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
 416                                 break;
 417                         case 'n':
 418                                 if (cflags == DP_C_SHORT) {
 419                                         short int *num;
 420                                         num = va_arg (args, short int *);
 421                                         *num = currlen;
 422                                 } else if (cflags == DP_C_LONG) {
 423                                         long int *num;
 424                                         num = va_arg (args, long int *);
 425                                         *num = (long int)currlen;
 426                                 } else if (cflags == DP_C_LLONG) {
 427                                         LLONG *num;
 428                                         num = va_arg (args, LLONG *);
 429                                         *num = (LLONG)currlen;
 430                                 } else {
 431                                         int *num;
 432                                         num = va_arg (args, int *);
 433                                         *num = currlen;
 434                                 }
 435                                 break;
 436                         case '%':
 437                                 dopr_outch (buffer, &currlen, maxlen, ch);
 438                                 break;
 439                         case 'w':
 440                                 /* not supported yet, treat as next char */
 441                                 ch = *format++;
 442                                 break;
 443                         default:
 444                                 /* Unknown, skip */
 445                                 break;
 446                         }
 447                         ch = *format++;
 448                         state = DP_S_DEFAULT;
 449                         flags = cflags = min = 0;
 450                         max = -1;
 451                         break;
 452                 case DP_S_DONE:
 453                         break;
 454                 default:
 455                         /* hmm? */
 456                         break; /* some picky compilers need this */
 457                 }
 458         }
 459         if (maxlen != 0) {
 460                 if (currlen < maxlen - 1)
 461                         buffer[currlen] = '\0';
 462                 else if (maxlen > 0)
 463                         buffer[maxlen - 1] = '\0';
 464         }
 465
 466         return currlen;
 467 }
 468
 469 static void fmtstr(char *buffer, size_t *currlen, size_t maxlen,
 470                     char *value, int flags, int min, int max)
 471 {
 472         int padlen, strln;     /* amount to pad */
 473         int cnt = 0;
 474
 475 #ifdef DEBUG_SNPRINTF
 476         printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value);
 477 #endif
 478         if (value == 0) {
 479                 value = "<NULL>";
 480         }
 481
 482         for (strln = 0; value[strln]; ++strln); /* strlen */
 483         padlen = min - strln;
 484         if (padlen < 0)
 485                 padlen = 0;
 486         if (flags & DP_F_MINUS)
 487                 padlen = -padlen; /* Left Justify */
 488
 489         while ((padlen > 0) && (cnt < max)) {
 490                 dopr_outch (buffer, currlen, maxlen, ' ');
 491                 --padlen;
 492                 ++cnt;
 493         }
 494         while (*value && (cnt < max)) {
 495                 dopr_outch (buffer, currlen, maxlen, *value++);
 496                 ++cnt;
 497         }
 498         while ((padlen < 0) && (cnt < max)) {
 499                 dopr_outch (buffer, currlen, maxlen, ' ');
 500                 ++padlen;
 501                 ++cnt;
 502         }
 503 }
 504
 505 /* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
 506
 507 static void fmtint(char *buffer, size_t *currlen, size_t maxlen,
 508                     long value, int base, int min, int max, int flags)
 509 {
 510         int signvalue = 0;
 511         unsigned long uvalue;
 512         char convert[20];
 513         int place = 0;
 514         int spadlen = 0; /* amount to space pad */
 515         int zpadlen = 0; /* amount to zero pad */
 516         int caps = 0;
 517
 518         if (max < 0)
 519                 max = 0;
 520
 521         uvalue = value;
 522
 523         if(!(flags & DP_F_UNSIGNED)) {
 524                 if( value < 0 ) {
 525                         signvalue = '-';
 526                         uvalue = -value;
 527                 } else {
 528                         if (flags & DP_F_PLUS)  /* Do a sign (+/i) */
 529                                 signvalue = '+';
 530                         else if (flags & DP_F_SPACE)
 531                                 signvalue = ' ';
 532                 }
 533         }
 534
 535         if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
 536
 537         do {
 538                 convert[place++] =
 539                         (caps? "0123456789ABCDEF":"0123456789abcdef")
 540                         [uvalue % (unsigned)base  ];
 541                 uvalue = (uvalue / (unsigned)base );
 542         } while(uvalue && (place < 20));
 543         if (place == 20) place--;
 544         convert[place] = 0;
 545
 546         zpadlen = max - place;
 547         spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
 548         if (zpadlen < 0) zpadlen = 0;
 549         if (spadlen < 0) spadlen = 0;
 550         if (flags & DP_F_ZERO) {
 551                 zpadlen = MAX(zpadlen, spadlen);
 552                 spadlen = 0;
 553         }
 554         if (flags & DP_F_MINUS)
 555                 spadlen = -spadlen; /* Left Justifty */
 556
 557 #ifdef DEBUG_SNPRINTF
 558         printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
 559                zpadlen, spadlen, min, max, place);
 560 #endif
 561
 562         /* Spaces */
 563         while (spadlen > 0) {
 564                 dopr_outch (buffer, currlen, maxlen, ' ');
 565                 --spadlen;
 566         }
 567
 568         /* Sign */
 569         if (signvalue)
 570                 dopr_outch (buffer, currlen, maxlen, signvalue);
 571
 572         /* Zeros */
 573         if (zpadlen > 0) {
 574                 while (zpadlen > 0) {
 575                         dopr_outch (buffer, currlen, maxlen, '0');
 576                         --zpadlen;
 577                 }
 578         }
 579
 580         /* Digits */
 581         while (place > 0)
 582                 dopr_outch (buffer, currlen, maxlen, convert[--place]);
 583
 584         /* Left Justified spaces */
 585         while (spadlen < 0) {
 586                 dopr_outch (buffer, currlen, maxlen, ' ');
 587                 ++spadlen;
 588         }
 589 }
 590
 591 static LDOUBLE abs_val(LDOUBLE value)
 592 {
 593         LDOUBLE result = value;
 594
 595         if (value < 0)
 596                 result = -value;
 597
 598         return result;
 599 }
 600
 601 static LDOUBLE POW10(int exp)
 602 {
 603         LDOUBLE result = 1;
 604
 605         while (exp) {
 606                 result *= 10;
 607                 exp--;
 608         }
 609
 610         return result;
 611 }
 612
 613 static LLONG ROUND(LDOUBLE value)
 614 {
 615         LLONG intpart;
 616
 617         intpart = (LLONG)value;
 618         value = value - intpart;
 619         if (value >= 0.5) intpart++;
 620
 621         return intpart;
 622 }
 623
 624 /* a replacement for modf that doesn't need the math library. Should
 625    be portable, but slow */
 626 static double my_modf(double x0, double *iptr)
 627 {
 628         int i;
 629         long l;
 630         double x = x0;
 631         double f = 1.0;
 632
 633         for (i=0;i<100;i++) {
 634                 l = (long)x;
 635                 if (l <= (x+1) && l >= (x-1)) {
 636                         if (i != 0) {
 637                                 double i2;
 638                                 double ret;
 639
 640                                 ret = my_modf(x0-l*f, &i2);
 641                                 (*iptr) = l*f + i2;
 642                                 return ret;
 643                         }
 644
 645                         (*iptr) = l;
 646                         return x - (*iptr);
 647                 }
 648                 x *= 0.1;
 649                 f *= 10.0;
 650         }
 651
 652         /* yikes! the number is beyond what we can handle. What do we do? */
 653         (*iptr) = 0;
 654         return 0;
 655 }
 656
 657
 658 static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
 659                    LDOUBLE fvalue, int min, int max, int flags)
 660 {
 661         int signvalue = 0;
 662         double ufvalue;
 663         char iconvert[311];
 664         char fconvert[311];
 665         int iplace = 0;
 666         int fplace = 0;
 667         int padlen = 0; /* amount to pad */
 668         int zpadlen = 0;
 669         int caps = 0;
 670         int idx;
 671         double intpart;
 672         double fracpart;
 673         double temp;
 674
 675         /*
 676          * AIX manpage says the default is 0, but Solaris says the default
 677          * is 6, and sprintf on AIX defaults to 6
 678          */
 679         if (max < 0)
 680                 max = 6;
 681
 682         ufvalue = abs_val (fvalue);
 683
 684         if (fvalue < 0) {
 685                 signvalue = '-';
 686         } else {
 687                 if (flags & DP_F_PLUS) { /* Do a sign (+/i) */
 688                         signvalue = '+';
 689                 } else {
 690                         if (flags & DP_F_SPACE)
 691                                 signvalue = ' ';
 692                 }
 693         }
 694
 695 #if 0
 696         if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
 697 #endif
 698
 699 #if 0
 700          if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */
 701 #endif
 702
 703         /*
 704          * Sorry, we only support 16 digits past the decimal because of our
 705          * conversion method
 706          */
 707         if (max > 16)
 708                 max = 16;
 709
 710         /* We "cheat" by converting the fractional part to integer by
 711          * multiplying by a factor of 10
 712          */
 713
 714         temp = ufvalue;
 715         my_modf(temp, &intpart);
 716
 717         fracpart = ROUND((POW10(max)) * (ufvalue - intpart));
 718
 719         if (fracpart >= POW10(max)) {
 720                 intpart++;
 721                 fracpart -= POW10(max);
 722         }
 723
 724
 725         /* Convert integer part */
 726         do {
 727                 temp = intpart*0.1;
 728                 my_modf(temp, &intpart);
 729                 idx = (int) ((temp -intpart +0.05)* 10.0);
 730                 /* idx = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */
 731                 /* printf ("%llf, %f, %x\n", temp, intpart, idx); */
 732                 iconvert[iplace++] =
 733                         (caps? "0123456789ABCDEF":"0123456789abcdef")[idx];
 734         } while (intpart && (iplace < 311));
 735         if (iplace == 311) iplace--;
 736         iconvert[iplace] = 0;
 737
 738         /* Convert fractional part */
 739         if (fracpart)
 740         {
 741                 do {
 742                         temp = fracpart*0.1;
 743                         my_modf(temp, &fracpart);
 744                         idx = (int) ((temp -fracpart +0.05)* 10.0);
 745                         /* idx = (int) ((((temp/10) -fracpart) +0.05) *10); */
 746                         /* printf ("%lf, %lf, %ld\n", temp, fracpart, idx ); */
 747                         fconvert[fplace++] =
 748                         (caps? "0123456789ABCDEF":"0123456789abcdef")[idx];
 749                 } while(fracpart && (fplace < 311));
 750                 if (fplace == 311) fplace--;
 751         }
 752         fconvert[fplace] = 0;
 753
 754         /* -1 for decimal point, another -1 if we are printing a sign */
 755         padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
 756         zpadlen = max - fplace;
 757         if (zpadlen < 0) zpadlen = 0;
 758         if (padlen < 0)
 759                 padlen = 0;
 760         if (flags & DP_F_MINUS)
 761                 padlen = -padlen; /* Left Justifty */
 762
 763         if ((flags & DP_F_ZERO) && (padlen > 0)) {
 764                 if (signvalue) {
 765                         dopr_outch (buffer, currlen, maxlen, signvalue);
 766                         --padlen;
 767                         signvalue = 0;
 768                 }
 769                 while (padlen > 0) {
 770                         dopr_outch (buffer, currlen, maxlen, '0');
 771                         --padlen;
 772                 }
 773         }
 774         while (padlen > 0) {
 775                 dopr_outch (buffer, currlen, maxlen, ' ');
 776                 --padlen;
 777         }
 778         if (signvalue)
 779                 dopr_outch (buffer, currlen, maxlen, signvalue);
 780
 781         while (iplace > 0)
 782                 dopr_outch (buffer, currlen, maxlen, iconvert[--iplace]);
 783
 784 #ifdef DEBUG_SNPRINTF
 785         printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen);
 786 #endif
 787
 788         /*
 789          * Decimal point.  This should probably use locale to find the correct
 790          * char to print out.
 791          */
 792         if (max > 0) {
 793                 dopr_outch (buffer, currlen, maxlen, '.');
 794
 795                 while (zpadlen > 0) {
 796                         dopr_outch (buffer, currlen, maxlen, '0');
 797                         --zpadlen;
 798                 }
 799
 800                 while (fplace > 0)
 801                         dopr_outch (buffer, currlen, maxlen, fconvert[--fplace]);
 802         }
 803
 804         while (padlen < 0) {
 805                 dopr_outch (buffer, currlen, maxlen, ' ');
 806                 ++padlen;
 807         }
 808 }
 809
 810 static void dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c)
 811 {
 812         if (*currlen < maxlen) {
 813                 buffer[(*currlen)] = c;
 814         }
 815         (*currlen)++;
 816 }
 817
 818  int rsync_vsnprintf (char *str, size_t count, const char *fmt, va_list args)
 819 {
 820         return dopr(str, count, fmt, args);
 821 }
 822 #define vsnprintf rsync_vsnprintf
 823 #endif
 824
 825 /* yes this really must be a ||. Don't muck with this (tridge)
 826  *
 827  * The logic for these two is that we need our own definition if the
 828  * OS *either* has no definition of *sprintf, or if it does have one
 829  * that doesn't work properly according to the autoconf test.
 830  */
 831 #if !defined(HAVE_SNPRINTF) || !defined(HAVE_C99_VSNPRINTF)
 832 int rsync_snprintf(char *str,size_t count,const char *fmt,...)
 833 {
 834         size_t ret;
 835         va_list ap;
 836
 837         va_start(ap, fmt);
 838         ret = vsnprintf(str, count, fmt, ap);
 839         va_end(ap);
 840         return ret;
 841 }
 842 #define snprintf rsync_snprintf
 843 #endif
 844
 845 #endif
 846
 847 #ifndef HAVE_VASPRINTF
 848  int vasprintf(char **ptr, const char *format, va_list ap)
 849 {
 850         int ret;
 851         va_list ap2;
 852
 853         VA_COPY(ap2, ap);
 854
 855         ret = vsnprintf(NULL, 0, format, ap2);
 856         if (ret <= 0) return ret;
 857
 858         (*ptr) = (char *)malloc(ret+1);
 859         if (!*ptr) return -1;
 860
 861         VA_COPY(ap2, ap);
 862
 863         ret = vsnprintf(*ptr, ret+1, format, ap2);
 864
 865         return ret;
 866 }
 867 #endif
 868
 869
 870 #ifndef HAVE_ASPRINTF
 871  int asprintf(char **ptr, const char *format, ...)
 872 {
 873         va_list ap;
 874         int ret;
 875
 876         *ptr = NULL;
 877         va_start(ap, format);
 878         ret = vasprintf(ptr, format, ap);
 879         va_end(ap);
 880
 881         return ret;
 882 }
 883 #endif
 884
 885 #ifdef TEST_SNPRINTF
 886
 887  int sprintf(char *str,const char *fmt,...);
 888
 889  int main (void)
 890 {
 891         char buf1[1024];
 892         char buf2[1024];
 893         char *fp_fmt[] = {
 894                 "%1.1f",
 895                 "%-1.5f",
 896                 "%1.5f",
 897                 "%123.9f",
 898                 "%10.5f",
 899                 "% 10.5f",
 900                 "%+22.9f",
 901                 "%+4.9f",
 902                 "%01.3f",
 903                 "%4f",
 904                 "%3.1f",
 905                 "%3.2f",
 906                 "%.0f",
 907                 "%f",
 908                 "-16.16f",
 909                 NULL
 910         };
 911         double fp_nums[] = { 6442452944.1234, -1.5, 134.21, 91340.2, 341.1234, 203.9, 0.96, 0.996,
 912                              0.9996, 1.996, 4.136, 5.030201, 0.00205,
 913                              /* END LIST */ 0};
 914         char *int_fmt[] = {
 915                 "%-1.5d",
 916                 "%1.5d",
 917                 "%123.9d",
 918                 "%5.5d",
 919                 "%10.5d",
 920                 "% 10.5d",
 921                 "%+22.33d",
 922                 "%01.3d",
 923                 "%4d",
 924                 "%d",
 925                 NULL
 926         };
 927         long int_nums[] = { -1, 134, 91340, 341, 0203, 0};
 928         char *str_fmt[] = {
 929                 "10.5s",
 930                 "5.10s",
 931                 "10.1s",
 932                 "0.10s",
 933                 "10.0s",
 934                 "1.10s",
 935                 "%s",
 936                 "%.1s",
 937                 "%.10s",
 938                 "%10s",
 939                 NULL
 940         };
 941         char *str_vals[] = {"hello", "a", "", "a longer string", NULL};
 942         int x, y;
 943         int fail = 0;
 944         int num = 0;
 945
 946         printf ("Testing snprintf format codes against system sprintf...\n");
 947
 948         for (x = 0; fp_fmt[x] ; x++) {
 949                 for (y = 0; fp_nums[y] != 0 ; y++) {
 950                         int l1 = snprintf(NULL, 0, fp_fmt[x], fp_nums[y]);
 951                         int l2 = snprintf(buf1, sizeof(buf1), fp_fmt[x], fp_nums[y]);
 952                         sprintf (buf2, fp_fmt[x], fp_nums[y]);
 953                         if (strcmp (buf1, buf2)) {
 954                                 printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n",
 955                                        fp_fmt[x], buf1, buf2);
 956                                 fail++;
 957                         }
 958                         if (l1 != l2) {
 959                                 printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, fp_fmt[x]);
 960                                 fail++;
 961                         }
 962                         num++;
 963                 }
 964         }
 965
 966         for (x = 0; int_fmt[x] ; x++) {
 967                 for (y = 0; int_nums[y] != 0 ; y++) {
 968                         int l1 = snprintf(NULL, 0, int_fmt[x], int_nums[y]);
 969                         int l2 = snprintf(buf1, sizeof(buf1), int_fmt[x], int_nums[y]);
 970                         sprintf (buf2, int_fmt[x], int_nums[y]);
 971                         if (strcmp (buf1, buf2)) {
 972                                 printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n",
 973                                        int_fmt[x], buf1, buf2);
 974                                 fail++;
 975                         }
 976                         if (l1 != l2) {
 977                                 printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, int_fmt[x]);
 978                                 fail++;
 979                         }
 980                         num++;
 981                 }
 982         }
 983
 984         for (x = 0; str_fmt[x] ; x++) {
 985                 for (y = 0; str_vals[y] != 0 ; y++) {
 986                         int l1 = snprintf(NULL, 0, str_fmt[x], str_vals[y]);
 987                         int l2 = snprintf(buf1, sizeof(buf1), str_fmt[x], str_vals[y]);
 988                         sprintf (buf2, str_fmt[x], str_vals[y]);
 989                         if (strcmp (buf1, buf2)) {
 990                                 printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n",
 991                                        str_fmt[x], buf1, buf2);
 992                                 fail++;
 993                         }
 994                         if (l1 != l2) {
 995                                 printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, str_fmt[x]);
 996                                 fail++;
 997                         }
 998                         num++;
 999                 }
1000         }
1001
1002         printf ("%d tests failed out of %d.\n", fail, num);
1003
1004         printf("seeing how many digits we support\n");
1005         {
1006                 double v0 = 0.12345678901234567890123456789012345678901;
1007                 for (x=0; x<100; x++) {
1008                         double p = pow(10, x);
1009                         double r = v0*p;
1010                         snprintf(buf1, sizeof(buf1), "%1.1f", r);
1011                         sprintf(buf2,                "%1.1f", r);
1012                         if (strcmp(buf1, buf2)) {
1013                                 printf("we seem to support %d digits\n", x-1);
1014                                 break;
1015                         }
1016                 }
1017         }
1018
1019         return 0;
1020 }
1021 #endif /* TEST_SNPRINTF */