src/sds.c

   1 /* SDSLib, A C dynamic strings library
   2  *
   3  * Copyright (c) 2006-2010, Salvatore Sanfilippo <antirez at gmail dot com>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  *   * Redistributions of source code must retain the above copyright notice,
  10  *     this list of conditions and the following disclaimer.
  11  *   * Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  *   * Neither the name of Redis nor the names of its contributors may be used
  15  *     to endorse or promote products derived from this software without
  16  *     specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  * History:
  31  *
  32  * - 22 March 2011: History section created on top of sds.c
  33  * - 22 March 2011: Fixed a problem with "\xab" escapes convertion in
  34  *                  function sdssplitargs().
  35  */
  36
  37 #define SDS_ABORT_ON_OOM
  38
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <ctype.h>
  43 #include <assert.h>
  44 #include "sds.h"
  45 #include "zmalloc.h"
  46
  47 static void sdsOomAbort(void) {
  48     fprintf(stderr,"SDS: Out Of Memory (SDS_ABORT_ON_OOM defined)\n");
  49     abort();
  50 }
  51
  52 sds sdsnewlen(const void *init, size_t initlen) {
  53     struct sdshdr *sh;
  54
  55     if (init) {
  56         sh = zmalloc(sizeof(struct sdshdr)+initlen+1);
  57     } else {
  58         sh = zcalloc(sizeof(struct sdshdr)+initlen+1);
  59     }
  60 #ifdef SDS_ABORT_ON_OOM
  61     if (sh == NULL) sdsOomAbort();
  62 #else
  63     if (sh == NULL) return NULL;
  64 #endif
  65     sh->len = initlen;
  66     sh->free = 0;
  67     if (initlen && init)
  68         memcpy(sh->buf, init, initlen);
  69     sh->buf[initlen] = '\0';
  70     return (char*)sh->buf;
  71 }
  72
  73 sds sdsempty(void) {
  74     return sdsnewlen("",0);
  75 }
  76
  77 sds sdsnew(const char *init) {
  78     size_t initlen = (init == NULL) ? 0 : strlen(init);
  79     return sdsnewlen(init, initlen);
  80 }
  81
  82 sds sdsdup(const sds s) {
  83     return sdsnewlen(s, sdslen(s));
  84 }
  85
  86 void sdsfree(sds s) {
  87     if (s == NULL) return;
  88     zfree(s-sizeof(struct sdshdr));
  89 }
  90
  91 void sdsupdatelen(sds s) {
  92     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
  93     int reallen = strlen(s);
  94     sh->free += (sh->len-reallen);
  95     sh->len = reallen;
  96 }
  97
  98 void sdsclear(sds s) {
  99     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 100     sh->free += sh->len;
 101     sh->len = 0;
 102     sh->buf[0] = '\0';
 103 }
 104
 105 /* Enlarge the free space at the end of the sds string so that the caller
 106  * is sure that after calling this function can overwrite up to addlen
 107  * bytes after the end of the string, plus one more byte for nul term.
 108  *
 109  * Note: this does not change the *size* of the sds string as returned
 110  * by sdslen(), but only the free buffer space we have. */
 111 sds sdsMakeRoomFor(sds s, size_t addlen) {
 112     struct sdshdr *sh, *newsh;
 113     size_t free = sdsavail(s);
 114     size_t len, newlen;
 115
 116     if (free >= addlen) return s;
 117     len = sdslen(s);
 118     sh = (void*) (s-(sizeof(struct sdshdr)));
 119     newlen = (len+addlen);
 120     if (newlen < SDS_MAX_PREALLOC)
 121         newlen *= 2;
 122     else
 123         newlen += SDS_MAX_PREALLOC;
 124     newsh = zrealloc(sh, sizeof(struct sdshdr)+newlen+1);
 125 #ifdef SDS_ABORT_ON_OOM
 126     if (newsh == NULL) sdsOomAbort();
 127 #else
 128     if (newsh == NULL) return NULL;
 129 #endif
 130
 131     newsh->free = newlen - len;
 132     return newsh->buf;
 133 }
 134
 135 /* Increment the sds length and decrements the left free space at the
 136  * end of the string accordingly to 'incr'. Also set the null term
 137  * in the new end of the string.
 138  *
 139  * This function is used in order to fix the string length after the
 140  * user calls sdsMakeRoomFor(), writes something after the end of
 141  * the current string, and finally needs to set the new length.
 142  *
 143  * Note: it is possible to use a negative increment in order to
 144  * right-trim the string.
 145  *
 146  * Using sdsIncrLen() and sdsMakeRoomFor() it is possible to mount the
 147  * following schema to cat bytes coming from the kerenl to the end of an
 148  * sds string new things without copying into an intermediate buffer:
 149  *
 150  * oldlen = sdslen(s);
 151  * s = sdsMakeRoomFor(s, BUFFER_SIZE);
 152  * nread = read(fd, s+oldlen, BUFFER_SIZE);
 153  * ... check for nread <= 0 and handle it ...
 154  * sdsIncrLen(s, nhread);
 155  */
 156 void sdsIncrLen(sds s, int incr) {
 157     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 158
 159     assert(sh->free >= incr);
 160     sh->len += incr;
 161     sh->free -= incr;
 162     assert(sh->free >= 0);
 163     s[sh->len] = '\0';
 164 }
 165
 166 /* Grow the sds to have the specified length. Bytes that were not part of
 167  * the original length of the sds will be set to zero. */
 168 sds sdsgrowzero(sds s, size_t len) {
 169     struct sdshdr *sh = (void*)(s-(sizeof(struct sdshdr)));
 170     size_t totlen, curlen = sh->len;
 171
 172     if (len <= curlen) return s;
 173     s = sdsMakeRoomFor(s,len-curlen);
 174     if (s == NULL) return NULL;
 175
 176     /* Make sure added region doesn't contain garbage */
 177     sh = (void*)(s-(sizeof(struct sdshdr)));
 178     memset(s+curlen,0,(len-curlen+1)); /* also set trailing \0 byte */
 179     totlen = sh->len+sh->free;
 180     sh->len = len;
 181     sh->free = totlen-sh->len;
 182     return s;
 183 }
 184
 185 sds sdscatlen(sds s, void *t, size_t len) {
 186     struct sdshdr *sh;
 187     size_t curlen = sdslen(s);
 188
 189     s = sdsMakeRoomFor(s,len);
 190     if (s == NULL) return NULL;
 191     sh = (void*) (s-(sizeof(struct sdshdr)));
 192     memcpy(s+curlen, t, len);
 193     sh->len = curlen+len;
 194     sh->free = sh->free-len;
 195     s[curlen+len] = '\0';
 196     return s;
 197 }
 198
 199 sds sdscat(sds s, char *t) {
 200     return sdscatlen(s, t, strlen(t));
 201 }
 202
 203 sds sdscatsds(sds s, sds t) {
 204     return sdscatlen(s, t, sdslen(t));
 205 }
 206
 207 sds sdscpylen(sds s, char *t, size_t len) {
 208     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 209     size_t totlen = sh->free+sh->len;
 210
 211     if (totlen < len) {
 212         s = sdsMakeRoomFor(s,len-sh->len);
 213         if (s == NULL) return NULL;
 214         sh = (void*) (s-(sizeof(struct sdshdr)));
 215         totlen = sh->free+sh->len;
 216     }
 217     memcpy(s, t, len);
 218     s[len] = '\0';
 219     sh->len = len;
 220     sh->free = totlen-len;
 221     return s;
 222 }
 223
 224 sds sdscpy(sds s, char *t) {
 225     return sdscpylen(s, t, strlen(t));
 226 }
 227
 228 sds sdscatvprintf(sds s, const char *fmt, va_list ap) {
 229     va_list cpy;
 230     char *buf, *t;
 231     size_t buflen = 16;
 232
 233     while(1) {
 234         buf = zmalloc(buflen);
 235 #ifdef SDS_ABORT_ON_OOM
 236         if (buf == NULL) sdsOomAbort();
 237 #else
 238         if (buf == NULL) return NULL;
 239 #endif
 240         buf[buflen-2] = '\0';
 241         va_copy(cpy,ap);
 242         vsnprintf(buf, buflen, fmt, cpy);
 243         if (buf[buflen-2] != '\0') {
 244             zfree(buf);
 245             buflen *= 2;
 246             continue;
 247         }
 248         break;
 249     }
 250     t = sdscat(s, buf);
 251     zfree(buf);
 252     return t;
 253 }
 254
 255 sds sdscatprintf(sds s, const char *fmt, ...) {
 256     va_list ap;
 257     char *t;
 258     va_start(ap, fmt);
 259     t = sdscatvprintf(s,fmt,ap);
 260     va_end(ap);
 261     return t;
 262 }
 263
 264 sds sdstrim(sds s, const char *cset) {
 265     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 266     char *start, *end, *sp, *ep;
 267     size_t len;
 268
 269     sp = start = s;
 270     ep = end = s+sdslen(s)-1;
 271     while(sp <= end && strchr(cset, *sp)) sp++;
 272     while(ep > start && strchr(cset, *ep)) ep--;
 273     len = (sp > ep) ? 0 : ((ep-sp)+1);
 274     if (sh->buf != sp) memmove(sh->buf, sp, len);
 275     sh->buf[len] = '\0';
 276     sh->free = sh->free+(sh->len-len);
 277     sh->len = len;
 278     return s;
 279 }
 280
 281 sds sdsrange(sds s, int start, int end) {
 282     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 283     size_t newlen, len = sdslen(s);
 284
 285     if (len == 0) return s;
 286     if (start < 0) {
 287         start = len+start;
 288         if (start < 0) start = 0;
 289     }
 290     if (end < 0) {
 291         end = len+end;
 292         if (end < 0) end = 0;
 293     }
 294     newlen = (start > end) ? 0 : (end-start)+1;
 295     if (newlen != 0) {
 296         if (start >= (signed)len) {
 297             newlen = 0;
 298         } else if (end >= (signed)len) {
 299             end = len-1;
 300             newlen = (start > end) ? 0 : (end-start)+1;
 301         }
 302     } else {
 303         start = 0;
 304     }
 305     if (start && newlen) memmove(sh->buf, sh->buf+start, newlen);
 306     sh->buf[newlen] = 0;
 307     sh->free = sh->free+(sh->len-newlen);
 308     sh->len = newlen;
 309     return s;
 310 }
 311
 312 void sdstolower(sds s) {
 313     int len = sdslen(s), j;
 314
 315     for (j = 0; j < len; j++) s[j] = tolower(s[j]);
 316 }
 317
 318 void sdstoupper(sds s) {
 319     int len = sdslen(s), j;
 320
 321     for (j = 0; j < len; j++) s[j] = toupper(s[j]);
 322 }
 323
 324 int sdscmp(sds s1, sds s2) {
 325     size_t l1, l2, minlen;
 326     int cmp;
 327
 328     l1 = sdslen(s1);
 329     l2 = sdslen(s2);
 330     minlen = (l1 < l2) ? l1 : l2;
 331     cmp = memcmp(s1,s2,minlen);
 332     if (cmp == 0) return l1-l2;
 333     return cmp;
 334 }
 335
 336 /* Split 's' with separator in 'sep'. An array
 337  * of sds strings is returned. *count will be set
 338  * by reference to the number of tokens returned.
 339  *
 340  * On out of memory, zero length string, zero length
 341  * separator, NULL is returned.
 342  *
 343  * Note that 'sep' is able to split a string using
 344  * a multi-character separator. For example
 345  * sdssplit("foo_-_bar","_-_"); will return two
 346  * elements "foo" and "bar".
 347  *
 348  * This version of the function is binary-safe but
 349  * requires length arguments. sdssplit() is just the
 350  * same function but for zero-terminated strings.
 351  */
 352 sds *sdssplitlen(char *s, int len, char *sep, int seplen, int *count) {
 353     int elements = 0, slots = 5, start = 0, j;
 354     sds *tokens;
 355
 356     if (seplen < 1 || len < 0) return NULL;
 357
 358     tokens = zmalloc(sizeof(sds)*slots);
 359 #ifdef SDS_ABORT_ON_OOM
 360     if (tokens == NULL) sdsOomAbort();
 361 #else
 362     if (tokens == NULL) return NULL;
 363 #endif
 364
 365     if (len == 0) {
 366         *count = 0;
 367         return tokens;
 368     }
 369     for (j = 0; j < (len-(seplen-1)); j++) {
 370         /* make sure there is room for the next element and the final one */
 371         if (slots < elements+2) {
 372             sds *newtokens;
 373
 374             slots *= 2;
 375             newtokens = zrealloc(tokens,sizeof(sds)*slots);
 376             if (newtokens == NULL) {
 377 #ifdef SDS_ABORT_ON_OOM
 378                 sdsOomAbort();
 379 #else
 380                 goto cleanup;
 381 #endif
 382             }
 383             tokens = newtokens;
 384         }
 385         /* search the separator */
 386         if ((seplen == 1 && *(s+j) == sep[0]) || (memcmp(s+j,sep,seplen) == 0)) {
 387             tokens[elements] = sdsnewlen(s+start,j-start);
 388             if (tokens[elements] == NULL) {
 389 #ifdef SDS_ABORT_ON_OOM
 390                 sdsOomAbort();
 391 #else
 392                 goto cleanup;
 393 #endif
 394             }
 395             elements++;
 396             start = j+seplen;
 397             j = j+seplen-1; /* skip the separator */
 398         }
 399     }
 400     /* Add the final element. We are sure there is room in the tokens array. */
 401     tokens[elements] = sdsnewlen(s+start,len-start);
 402     if (tokens[elements] == NULL) {
 403 #ifdef SDS_ABORT_ON_OOM
 404                 sdsOomAbort();
 405 #else
 406                 goto cleanup;
 407 #endif
 408     }
 409     elements++;
 410     *count = elements;
 411     return tokens;
 412
 413 #ifndef SDS_ABORT_ON_OOM
 414 cleanup:
 415     {
 416         int i;
 417         for (i = 0; i < elements; i++) sdsfree(tokens[i]);
 418         zfree(tokens);
 419         *count = 0;
 420         return NULL;
 421     }
 422 #endif
 423 }
 424
 425 void sdsfreesplitres(sds *tokens, int count) {
 426     if (!tokens) return;
 427     while(count--)
 428         sdsfree(tokens[count]);
 429     zfree(tokens);
 430 }
 431
 432 sds sdsfromlonglong(long long value) {
 433     char buf[32], *p;
 434     unsigned long long v;
 435
 436     v = (value < 0) ? -value : value;
 437     p = buf+31; /* point to the last character */
 438     do {
 439         *p-- = '0'+(v%10);
 440         v /= 10;
 441     } while(v);
 442     if (value < 0) *p-- = '-';
 443     p++;
 444     return sdsnewlen(p,32-(p-buf));
 445 }
 446
 447 sds sdscatrepr(sds s, char *p, size_t len) {
 448     s = sdscatlen(s,"\"",1);
 449     while(len--) {
 450         switch(*p) {
 451         case '\\':
 452         case '"':
 453             s = sdscatprintf(s,"\\%c",*p);
 454             break;
 455         case '\n': s = sdscatlen(s,"\\n",2); break;
 456         case '\r': s = sdscatlen(s,"\\r",2); break;
 457         case '\t': s = sdscatlen(s,"\\t",2); break;
 458         case '\a': s = sdscatlen(s,"\\a",2); break;
 459         case '\b': s = sdscatlen(s,"\\b",2); break;
 460         default:
 461             if (isprint(*p))
 462                 s = sdscatprintf(s,"%c",*p);
 463             else
 464                 s = sdscatprintf(s,"\\x%02x",(unsigned char)*p);
 465             break;
 466         }
 467         p++;
 468     }
 469     return sdscatlen(s,"\"",1);
 470 }
 471
 472 /* Helper function for sdssplitargs() that returns non zero if 'c'
 473  * is a valid hex digit. */
 474 int is_hex_digit(char c) {
 475     return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') ||
 476            (c >= 'A' && c <= 'F');
 477 }
 478
 479 /* Helper function for sdssplitargs() that converts an hex digit into an
 480  * integer from 0 to 15 */
 481 int hex_digit_to_int(char c) {
 482     switch(c) {
 483     case '0': return 0;
 484     case '1': return 1;
 485     case '2': return 2;
 486     case '3': return 3;
 487     case '4': return 4;
 488     case '5': return 5;
 489     case '6': return 6;
 490     case '7': return 7;
 491     case '8': return 8;
 492     case '9': return 9;
 493     case 'a': case 'A': return 10;
 494     case 'b': case 'B': return 11;
 495     case 'c': case 'C': return 12;
 496     case 'd': case 'D': return 13;
 497     case 'e': case 'E': return 14;
 498     case 'f': case 'F': return 15;
 499     default: return 0;
 500     }
 501 }
 502
 503 /* Split a line into arguments, where every argument can be in the
 504  * following programming-language REPL-alike form:
 505  *
 506  * foo bar "newline are supported\n" and "\xff\x00otherstuff"
 507  *
 508  * The number of arguments is stored into *argc, and an array
 509  * of sds is returned. The caller should sdsfree() all the returned
 510  * strings and finally zfree() the array itself.
 511  *
 512  * Note that sdscatrepr() is able to convert back a string into
 513  * a quoted string in the same format sdssplitargs() is able to parse.
 514  */
 515 sds *sdssplitargs(char *line, int *argc) {
 516     char *p = line;
 517     char *current = NULL;
 518     char **vector = NULL;
 519
 520     *argc = 0;
 521     while(1) {
 522         /* skip blanks */
 523         while(*p && isspace(*p)) p++;
 524         if (*p) {
 525             /* get a token */
 526             int inq=0;  /* set to 1 if we are in "quotes" */
 527             int insq=0; /* set to 1 if we are in 'single quotes' */
 528             int done=0;
 529
 530             if (current == NULL) current = sdsempty();
 531             while(!done) {
 532                 if (inq) {
 533                     if (*p == '\\' && *(p+1) == 'x' &&
 534                                              is_hex_digit(*(p+2)) &&
 535                                              is_hex_digit(*(p+3)))
 536                     {
 537                         unsigned char byte;
 538
 539                         byte = (hex_digit_to_int(*(p+2))*16)+
 540                                 hex_digit_to_int(*(p+3));
 541                         current = sdscatlen(current,(char*)&byte,1);
 542                         p += 3;
 543                     } else if (*p == '\\' && *(p+1)) {
 544                         char c;
 545
 546                         p++;
 547                         switch(*p) {
 548                         case 'n': c = '\n'; break;
 549                         case 'r': c = '\r'; break;
 550                         case 't': c = '\t'; break;
 551                         case 'b': c = '\b'; break;
 552                         case 'a': c = '\a'; break;
 553                         default: c = *p; break;
 554                         }
 555                         current = sdscatlen(current,&c,1);
 556                     } else if (*p == '"') {
 557                         /* closing quote must be followed by a space or
 558                          * nothing at all. */
 559                         if (*(p+1) && !isspace(*(p+1))) goto err;
 560                         done=1;
 561                     } else if (!*p) {
 562                         /* unterminated quotes */
 563                         goto err;
 564                     } else {
 565                         current = sdscatlen(current,p,1);
 566                     }
 567                 } else if (insq) {
 568                     if (*p == '\\' && *(p+1) == '\'') {
 569                         p++;
 570                         current = sdscatlen(current,"'",1);
 571                     } else if (*p == '\'') {
 572                         /* closing quote must be followed by a space or
 573                          * nothing at all. */
 574                         if (*(p+1) && !isspace(*(p+1))) goto err;
 575                         done=1;
 576                     } else if (!*p) {
 577                         /* unterminated quotes */
 578                         goto err;
 579                     } else {
 580                         current = sdscatlen(current,p,1);
 581                     }
 582                 } else {
 583                     switch(*p) {
 584                     case ' ':
 585                     case '\n':
 586                     case '\r':
 587                     case '\t':
 588                     case '\0':
 589                         done=1;
 590                         break;
 591                     case '"':
 592                         inq=1;
 593                         break;
 594                     case '\'':
 595                         insq=1;
 596                         break;
 597                     default:
 598                         current = sdscatlen(current,p,1);
 599                         break;
 600                     }
 601                 }
 602                 if (*p) p++;
 603             }
 604             /* add the token to the vector */
 605             vector = zrealloc(vector,((*argc)+1)*sizeof(char*));
 606             vector[*argc] = current;
 607             (*argc)++;
 608             current = NULL;
 609         } else {
 610             return vector;
 611         }
 612     }
 613
 614 err:
 615     while((*argc)--)
 616         sdsfree(vector[*argc]);
 617     zfree(vector);
 618     if (current) sdsfree(current);
 619     return NULL;
 620 }
 621
 622 void sdssplitargs_free(sds *argv, int argc) {
 623     int j;
 624
 625     for (j = 0 ;j < argc; j++) sdsfree(argv[j]);
 626     zfree(argv);
 627 }
 628
 629 /* Modify the string substituting all the occurrences of the set of
 630  * characters specifed in the 'from' string to the corresponding character
 631  * in the 'to' array.
 632  *
 633  * For instance: sdsmapchars(mystring, "ho", "01", 2)
 634  * will have the effect of turning the string "hello" into "0ell1".
 635  *
 636  * The function returns the sds string pointer, that is always the same
 637  * as the input pointer since no resize is needed. */
 638 sds sdsmapchars(sds s, char *from, char *to, size_t setlen) {
 639     size_t j, i, l = sdslen(s);
 640
 641     for (j = 0; j < l; j++) {
 642         for (i = 0; i < setlen; i++) {
 643             if (s[j] == from[i]) {
 644                 s[j] = to[i];
 645                 break;
 646             }
 647         }
 648     }
 649     return s;
 650 }
 651
 652 #ifdef SDS_TEST_MAIN
 653 #include <stdio.h>
 654 #include "testhelp.h"
 655
 656 int main(void) {
 657     {
 658         struct sdshdr *sh;
 659         sds x = sdsnew("foo"), y;
 660
 661         test_cond("Create a string and obtain the length",
 662             sdslen(x) == 3 && memcmp(x,"foo\0",4) == 0)
 663
 664         sdsfree(x);
 665         x = sdsnewlen("foo",2);
 666         test_cond("Create a string with specified length",
 667             sdslen(x) == 2 && memcmp(x,"fo\0",3) == 0)
 668
 669         x = sdscat(x,"bar");
 670         test_cond("Strings concatenation",
 671             sdslen(x) == 5 && memcmp(x,"fobar\0",6) == 0);
 672
 673         x = sdscpy(x,"a");
 674         test_cond("sdscpy() against an originally longer string",
 675             sdslen(x) == 1 && memcmp(x,"a\0",2) == 0)
 676
 677         x = sdscpy(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk");
 678         test_cond("sdscpy() against an originally shorter string",
 679             sdslen(x) == 33 &&
 680             memcmp(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk\0",33) == 0)
 681
 682         sdsfree(x);
 683         x = sdscatprintf(sdsempty(),"%d",123);
 684         test_cond("sdscatprintf() seems working in the base case",
 685             sdslen(x) == 3 && memcmp(x,"123\0",4) ==0)
 686
 687         sdsfree(x);
 688         x = sdstrim(sdsnew("xxciaoyyy"),"xy");
 689         test_cond("sdstrim() correctly trims characters",
 690             sdslen(x) == 4 && memcmp(x,"ciao\0",5) == 0)
 691
 692         y = sdsrange(sdsdup(x),1,1);
 693         test_cond("sdsrange(...,1,1)",
 694             sdslen(y) == 1 && memcmp(y,"i\0",2) == 0)
 695
 696         sdsfree(y);
 697         y = sdsrange(sdsdup(x),1,-1);
 698         test_cond("sdsrange(...,1,-1)",
 699             sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0)
 700
 701         sdsfree(y);
 702         y = sdsrange(sdsdup(x),-2,-1);
 703         test_cond("sdsrange(...,-2,-1)",
 704             sdslen(y) == 2 && memcmp(y,"ao\0",3) == 0)
 705
 706         sdsfree(y);
 707         y = sdsrange(sdsdup(x),2,1);
 708         test_cond("sdsrange(...,2,1)",
 709             sdslen(y) == 0 && memcmp(y,"\0",1) == 0)
 710
 711         sdsfree(y);
 712         y = sdsrange(sdsdup(x),1,100);
 713         test_cond("sdsrange(...,1,100)",
 714             sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0)
 715
 716         sdsfree(y);
 717         y = sdsrange(sdsdup(x),100,100);
 718         test_cond("sdsrange(...,100,100)",
 719             sdslen(y) == 0 && memcmp(y,"\0",1) == 0)
 720
 721         sdsfree(y);
 722         sdsfree(x);
 723         x = sdsnew("foo");
 724         y = sdsnew("foa");
 725         test_cond("sdscmp(foo,foa)", sdscmp(x,y) > 0)
 726
 727         sdsfree(y);
 728         sdsfree(x);
 729         x = sdsnew("bar");
 730         y = sdsnew("bar");
 731         test_cond("sdscmp(bar,bar)", sdscmp(x,y) == 0)
 732
 733         sdsfree(y);
 734         sdsfree(x);
 735         x = sdsnew("aar");
 736         y = sdsnew("bar");
 737         test_cond("sdscmp(bar,bar)", sdscmp(x,y) < 0)
 738
 739         {
 740             int oldfree;
 741
 742             sdsfree(x);
 743             x = sdsnew("0");
 744             sh = (void*) (x-(sizeof(struct sdshdr)));
 745             test_cond("sdsnew() free/len buffers", sh->len == 1 && sh->free == 0);
 746             x = sdsMakeRoomFor(x,1);
 747             sh = (void*) (x-(sizeof(struct sdshdr)));
 748             test_cond("sdsMakeRoomFor()", sh->len == 1 && sh->free > 0);
 749             oldfree = sh->free;
 750             x[1] = '1';
 751             sdsIncrLen(x,1);
 752             test_cond("sdsIncrLen() -- content", x[0] == '0' && x[1] == '1');
 753             test_cond("sdsIncrLen() -- len", sh->len == 2);
 754             test_cond("sdsIncrLen() -- free", sh->free == oldfree-1);
 755         }
 756     }
 757     test_report()
 758     return 0;
 759 }
 760 #endif