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 "sds.h"
  44 #include "zmalloc.h"
  45
  46 static void sdsOomAbort(void) {
  47     fprintf(stderr,"SDS: Out Of Memory (SDS_ABORT_ON_OOM defined)\n");
  48     abort();
  49 }
  50
  51 sds sdsnewlen(const void *init, size_t initlen) {
  52     struct sdshdr *sh;
  53
  54     if (init) {
  55         sh = zmalloc(sizeof(struct sdshdr)+initlen+1);
  56     } else {
  57         sh = zcalloc(sizeof(struct sdshdr)+initlen+1);
  58     }
  59 #ifdef SDS_ABORT_ON_OOM
  60     if (sh == NULL) sdsOomAbort();
  61 #else
  62     if (sh == NULL) return NULL;
  63 #endif
  64     sh->len = initlen;
  65     sh->free = 0;
  66     if (initlen && init)
  67         memcpy(sh->buf, init, initlen);
  68     sh->buf[initlen] = '\0';
  69     return (char*)sh->buf;
  70 }
  71
  72 sds sdsempty(void) {
  73     return sdsnewlen("",0);
  74 }
  75
  76 sds sdsnew(const char *init) {
  77     size_t initlen = (init == NULL) ? 0 : strlen(init);
  78     return sdsnewlen(init, initlen);
  79 }
  80
  81 sds sdsdup(const sds s) {
  82     return sdsnewlen(s, sdslen(s));
  83 }
  84
  85 void sdsfree(sds s) {
  86     if (s == NULL) return;
  87     zfree(s-sizeof(struct sdshdr));
  88 }
  89
  90 void sdsupdatelen(sds s) {
  91     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
  92     int reallen = strlen(s);
  93     sh->free += (sh->len-reallen);
  94     sh->len = reallen;
  95 }
  96
  97 void sdsclear(sds s) {
  98     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
  99     sh->free += sh->len;
 100     sh->len = 0;
 101     sh->buf[0] = '\0';
 102 }
 103
 104 static sds sdsMakeRoomFor(sds s, size_t addlen) {
 105     struct sdshdr *sh, *newsh;
 106     size_t free = sdsavail(s);
 107     size_t len, newlen;
 108
 109     if (free >= addlen) return s;
 110     len = sdslen(s);
 111     sh = (void*) (s-(sizeof(struct sdshdr)));
 112     newlen = (len+addlen)*2;
 113     newsh = zrealloc(sh, sizeof(struct sdshdr)+newlen+1);
 114 #ifdef SDS_ABORT_ON_OOM
 115     if (newsh == NULL) sdsOomAbort();
 116 #else
 117     if (newsh == NULL) return NULL;
 118 #endif
 119
 120     newsh->free = newlen - len;
 121     return newsh->buf;
 122 }
 123
 124 /* Grow the sds to have the specified length. Bytes that were not part of
 125  * the original length of the sds will be set to zero. */
 126 sds sdsgrowzero(sds s, size_t len) {
 127     struct sdshdr *sh = (void*)(s-(sizeof(struct sdshdr)));
 128     size_t totlen, curlen = sh->len;
 129
 130     if (len <= curlen) return s;
 131     s = sdsMakeRoomFor(s,len-curlen);
 132     if (s == NULL) return NULL;
 133
 134     /* Make sure added region doesn't contain garbage */
 135     sh = (void*)(s-(sizeof(struct sdshdr)));
 136     memset(s+curlen,0,(len-curlen+1)); /* also set trailing \0 byte */
 137     totlen = sh->len+sh->free;
 138     sh->len = len;
 139     sh->free = totlen-sh->len;
 140     return s;
 141 }
 142
 143 sds sdscatlen(sds s, void *t, size_t len) {
 144     struct sdshdr *sh;
 145     size_t curlen = sdslen(s);
 146
 147     s = sdsMakeRoomFor(s,len);
 148     if (s == NULL) return NULL;
 149     sh = (void*) (s-(sizeof(struct sdshdr)));
 150     memcpy(s+curlen, t, len);
 151     sh->len = curlen+len;
 152     sh->free = sh->free-len;
 153     s[curlen+len] = '\0';
 154     return s;
 155 }
 156
 157 sds sdscat(sds s, char *t) {
 158     return sdscatlen(s, t, strlen(t));
 159 }
 160
 161 sds sdscpylen(sds s, char *t, size_t len) {
 162     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 163     size_t totlen = sh->free+sh->len;
 164
 165     if (totlen < len) {
 166         s = sdsMakeRoomFor(s,len-sh->len);
 167         if (s == NULL) return NULL;
 168         sh = (void*) (s-(sizeof(struct sdshdr)));
 169         totlen = sh->free+sh->len;
 170     }
 171     memcpy(s, t, len);
 172     s[len] = '\0';
 173     sh->len = len;
 174     sh->free = totlen-len;
 175     return s;
 176 }
 177
 178 sds sdscpy(sds s, char *t) {
 179     return sdscpylen(s, t, strlen(t));
 180 }
 181
 182 sds sdscatvprintf(sds s, const char *fmt, va_list ap) {
 183     va_list cpy;
 184     char *buf, *t;
 185     size_t buflen = 16;
 186
 187     while(1) {
 188         buf = zmalloc(buflen);
 189 #ifdef SDS_ABORT_ON_OOM
 190         if (buf == NULL) sdsOomAbort();
 191 #else
 192         if (buf == NULL) return NULL;
 193 #endif
 194         buf[buflen-2] = '\0';
 195         va_copy(cpy,ap);
 196         vsnprintf(buf, buflen, fmt, cpy);
 197         if (buf[buflen-2] != '\0') {
 198             zfree(buf);
 199             buflen *= 2;
 200             continue;
 201         }
 202         break;
 203     }
 204     t = sdscat(s, buf);
 205     zfree(buf);
 206     return t;
 207 }
 208
 209 sds sdscatprintf(sds s, const char *fmt, ...) {
 210     va_list ap;
 211     char *t;
 212     va_start(ap, fmt);
 213     t = sdscatvprintf(s,fmt,ap);
 214     va_end(ap);
 215     return t;
 216 }
 217
 218 sds sdstrim(sds s, const char *cset) {
 219     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 220     char *start, *end, *sp, *ep;
 221     size_t len;
 222
 223     sp = start = s;
 224     ep = end = s+sdslen(s)-1;
 225     while(sp <= end && strchr(cset, *sp)) sp++;
 226     while(ep > start && strchr(cset, *ep)) ep--;
 227     len = (sp > ep) ? 0 : ((ep-sp)+1);
 228     if (sh->buf != sp) memmove(sh->buf, sp, len);
 229     sh->buf[len] = '\0';
 230     sh->free = sh->free+(sh->len-len);
 231     sh->len = len;
 232     return s;
 233 }
 234
 235 sds sdsrange(sds s, int start, int end) {
 236     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 237     size_t newlen, len = sdslen(s);
 238
 239     if (len == 0) return s;
 240     if (start < 0) {
 241         start = len+start;
 242         if (start < 0) start = 0;
 243     }
 244     if (end < 0) {
 245         end = len+end;
 246         if (end < 0) end = 0;
 247     }
 248     newlen = (start > end) ? 0 : (end-start)+1;
 249     if (newlen != 0) {
 250         if (start >= (signed)len) {
 251             newlen = 0;
 252         } else if (end >= (signed)len) {
 253             end = len-1;
 254             newlen = (start > end) ? 0 : (end-start)+1;
 255         }
 256     } else {
 257         start = 0;
 258     }
 259     if (start && newlen) memmove(sh->buf, sh->buf+start, newlen);
 260     sh->buf[newlen] = 0;
 261     sh->free = sh->free+(sh->len-newlen);
 262     sh->len = newlen;
 263     return s;
 264 }
 265
 266 void sdstolower(sds s) {
 267     int len = sdslen(s), j;
 268
 269     for (j = 0; j < len; j++) s[j] = tolower(s[j]);
 270 }
 271
 272 void sdstoupper(sds s) {
 273     int len = sdslen(s), j;
 274
 275     for (j = 0; j < len; j++) s[j] = toupper(s[j]);
 276 }
 277
 278 int sdscmp(sds s1, sds s2) {
 279     size_t l1, l2, minlen;
 280     int cmp;
 281
 282     l1 = sdslen(s1);
 283     l2 = sdslen(s2);
 284     minlen = (l1 < l2) ? l1 : l2;
 285     cmp = memcmp(s1,s2,minlen);
 286     if (cmp == 0) return l1-l2;
 287     return cmp;
 288 }
 289
 290 /* Split 's' with separator in 'sep'. An array
 291  * of sds strings is returned. *count will be set
 292  * by reference to the number of tokens returned.
 293  *
 294  * On out of memory, zero length string, zero length
 295  * separator, NULL is returned.
 296  *
 297  * Note that 'sep' is able to split a string using
 298  * a multi-character separator. For example
 299  * sdssplit("foo_-_bar","_-_"); will return two
 300  * elements "foo" and "bar".
 301  *
 302  * This version of the function is binary-safe but
 303  * requires length arguments. sdssplit() is just the
 304  * same function but for zero-terminated strings.
 305  */
 306 sds *sdssplitlen(char *s, int len, char *sep, int seplen, int *count) {
 307     int elements = 0, slots = 5, start = 0, j;
 308     sds *tokens;
 309
 310     if (seplen < 1 || len < 0) return NULL;
 311
 312     tokens = zmalloc(sizeof(sds)*slots);
 313 #ifdef SDS_ABORT_ON_OOM
 314     if (tokens == NULL) sdsOomAbort();
 315 #else
 316     if (tokens == NULL) return NULL;
 317 #endif
 318
 319     if (len == 0) {
 320         *count = 0;
 321         return tokens;
 322     }
 323     for (j = 0; j < (len-(seplen-1)); j++) {
 324         /* make sure there is room for the next element and the final one */
 325         if (slots < elements+2) {
 326             sds *newtokens;
 327
 328             slots *= 2;
 329             newtokens = zrealloc(tokens,sizeof(sds)*slots);
 330             if (newtokens == NULL) {
 331 #ifdef SDS_ABORT_ON_OOM
 332                 sdsOomAbort();
 333 #else
 334                 goto cleanup;
 335 #endif
 336             }
 337             tokens = newtokens;
 338         }
 339         /* search the separator */
 340         if ((seplen == 1 && *(s+j) == sep[0]) || (memcmp(s+j,sep,seplen) == 0)) {
 341             tokens[elements] = sdsnewlen(s+start,j-start);
 342             if (tokens[elements] == NULL) {
 343 #ifdef SDS_ABORT_ON_OOM
 344                 sdsOomAbort();
 345 #else
 346                 goto cleanup;
 347 #endif
 348             }
 349             elements++;
 350             start = j+seplen;
 351             j = j+seplen-1; /* skip the separator */
 352         }
 353     }
 354     /* Add the final element. We are sure there is room in the tokens array. */
 355     tokens[elements] = sdsnewlen(s+start,len-start);
 356     if (tokens[elements] == NULL) {
 357 #ifdef SDS_ABORT_ON_OOM
 358                 sdsOomAbort();
 359 #else
 360                 goto cleanup;
 361 #endif
 362     }
 363     elements++;
 364     *count = elements;
 365     return tokens;
 366
 367 #ifndef SDS_ABORT_ON_OOM
 368 cleanup:
 369     {
 370         int i;
 371         for (i = 0; i < elements; i++) sdsfree(tokens[i]);
 372         zfree(tokens);
 373         *count = 0;
 374         return NULL;
 375     }
 376 #endif
 377 }
 378
 379 void sdsfreesplitres(sds *tokens, int count) {
 380     if (!tokens) return;
 381     while(count--)
 382         sdsfree(tokens[count]);
 383     zfree(tokens);
 384 }
 385
 386 sds sdsfromlonglong(long long value) {
 387     char buf[32], *p;
 388     unsigned long long v;
 389
 390     v = (value < 0) ? -value : value;
 391     p = buf+31; /* point to the last character */
 392     do {
 393         *p-- = '0'+(v%10);
 394         v /= 10;
 395     } while(v);
 396     if (value < 0) *p-- = '-';
 397     p++;
 398     return sdsnewlen(p,32-(p-buf));
 399 }
 400
 401 sds sdscatrepr(sds s, char *p, size_t len) {
 402     s = sdscatlen(s,"\"",1);
 403     while(len--) {
 404         switch(*p) {
 405         case '\\':
 406         case '"':
 407             s = sdscatprintf(s,"\\%c",*p);
 408             break;
 409         case '\n': s = sdscatlen(s,"\\n",2); break;
 410         case '\r': s = sdscatlen(s,"\\r",2); break;
 411         case '\t': s = sdscatlen(s,"\\t",2); break;
 412         case '\a': s = sdscatlen(s,"\\a",2); break;
 413         case '\b': s = sdscatlen(s,"\\b",2); break;
 414         default:
 415             if (isprint(*p))
 416                 s = sdscatprintf(s,"%c",*p);
 417             else
 418                 s = sdscatprintf(s,"\\x%02x",(unsigned char)*p);
 419             break;
 420         }
 421         p++;
 422     }
 423     return sdscatlen(s,"\"",1);
 424 }
 425
 426 /* Helper function for sdssplitargs() that returns non zero if 'c'
 427  * is a valid hex digit. */
 428 int is_hex_digit(char c) {
 429     return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') ||
 430            (c >= 'A' && c <= 'F');
 431 }
 432
 433 /* Helper function for sdssplitargs() that converts an hex digit into an
 434  * integer from 0 to 15 */
 435 int hex_digit_to_int(char c) {
 436     switch(c) {
 437     case '0': return 0;
 438     case '1': return 1;
 439     case '2': return 2;
 440     case '3': return 3;
 441     case '4': return 4;
 442     case '5': return 5;
 443     case '6': return 6;
 444     case '7': return 7;
 445     case '8': return 8;
 446     case '9': return 9;
 447     case 'a': case 'A': return 10;
 448     case 'b': case 'B': return 11;
 449     case 'c': case 'C': return 12;
 450     case 'd': case 'D': return 13;
 451     case 'e': case 'E': return 14;
 452     case 'f': case 'F': return 15;
 453     default: return 0;
 454     }
 455 }
 456
 457 /* Split a line into arguments, where every argument can be in the
 458  * following programming-language REPL-alike form:
 459  *
 460  * foo bar "newline are supported\n" and "\xff\x00otherstuff"
 461  *
 462  * The number of arguments is stored into *argc, and an array
 463  * of sds is returned. The caller should sdsfree() all the returned
 464  * strings and finally zfree() the array itself.
 465  *
 466  * Note that sdscatrepr() is able to convert back a string into
 467  * a quoted string in the same format sdssplitargs() is able to parse.
 468  */
 469 sds *sdssplitargs(char *line, int *argc) {
 470     char *p = line;
 471     char *current = NULL;
 472     char **vector = NULL;
 473
 474     *argc = 0;
 475     while(1) {
 476         /* skip blanks */
 477         while(*p && isspace(*p)) p++;
 478         if (*p) {
 479             /* get a token */
 480             int inq=0; /* set to 1 if we are in "quotes" */
 481             int done=0;
 482
 483             if (current == NULL) current = sdsempty();
 484             while(!done) {
 485                 if (inq) {
 486                     if (*p == '\\' && *(p+1) == 'x' &&
 487                                              is_hex_digit(*(p+2)) &&
 488                                              is_hex_digit(*(p+3)))
 489                     {
 490                         unsigned char byte;
 491
 492                         byte = (hex_digit_to_int(*(p+2))*16)+
 493                                 hex_digit_to_int(*(p+3));
 494                         current = sdscatlen(current,(char*)&byte,1);
 495                         p += 3;
 496                     } else if (*p == '\\' && *(p+1)) {
 497                         char c;
 498
 499                         p++;
 500                         switch(*p) {
 501                         case 'n': c = '\n'; break;
 502                         case 'r': c = '\r'; break;
 503                         case 't': c = '\t'; break;
 504                         case 'b': c = '\b'; break;
 505                         case 'a': c = '\a'; break;
 506                         default: c = *p; break;
 507                         }
 508                         current = sdscatlen(current,&c,1);
 509                     } else if (*p == '"') {
 510                         /* closing quote must be followed by a space */
 511                         if (*(p+1) && !isspace(*(p+1))) goto err;
 512                         done=1;
 513                     } else if (!*p) {
 514                         /* unterminated quotes */
 515                         goto err;
 516                     } else {
 517                         current = sdscatlen(current,p,1);
 518                     }
 519                 } else {
 520                     switch(*p) {
 521                     case ' ':
 522                     case '\n':
 523                     case '\r':
 524                     case '\t':
 525                     case '\0':
 526                         done=1;
 527                         break;
 528                     case '"':
 529                         inq=1;
 530                         break;
 531                     default:
 532                         current = sdscatlen(current,p,1);
 533                         break;
 534                     }
 535                 }
 536                 if (*p) p++;
 537             }
 538             /* add the token to the vector */
 539             vector = zrealloc(vector,((*argc)+1)*sizeof(char*));
 540             vector[*argc] = current;
 541             (*argc)++;
 542             current = NULL;
 543         } else {
 544             return vector;
 545         }
 546     }
 547
 548 err:
 549     while((*argc)--)
 550         sdsfree(vector[*argc]);
 551     zfree(vector);
 552     if (current) sdsfree(current);
 553     return NULL;
 554 }
 555
 556 void sdssplitargs_free(sds *argv, int argc) {
 557     int j;
 558
 559     for (j = 0 ;j < argc; j++) sdsfree(argv[j]);
 560     zfree(argv);
 561 }
 562
 563 /* Modify the string substituting all the occurrences of the set of
 564  * characters specifed in the 'from' string to the corresponding character
 565  * in the 'to' array.
 566  *
 567  * For instance: sdsmapchars(mystring, "ho", "01", 2)
 568  * will have the effect of turning the string "hello" into "0ell1".
 569  *
 570  * The function returns the sds string pointer, that is always the same
 571  * as the input pointer since no resize is needed. */
 572 sds sdsmapchars(sds s, char *from, char *to, size_t setlen) {
 573     size_t j, i, l = sdslen(s);
 574
 575     for (j = 0; j < l; j++) {
 576         for (i = 0; i < setlen; i++) {
 577             if (s[j] == from[i]) {
 578                 s[j] = to[i];
 579                 break;
 580             }
 581         }
 582     }
 583     return s;
 584 }
 585
 586 #ifdef SDS_TEST_MAIN
 587 #include <stdio.h>
 588 #include "testhelp.h"
 589
 590 int main(void) {
 591     {
 592         sds x = sdsnew("foo"), y;
 593
 594         test_cond("Create a string and obtain the length",
 595             sdslen(x) == 3 && memcmp(x,"foo\0",4) == 0)
 596
 597         sdsfree(x);
 598         x = sdsnewlen("foo",2);
 599         test_cond("Create a string with specified length",
 600             sdslen(x) == 2 && memcmp(x,"fo\0",3) == 0)
 601
 602         x = sdscat(x,"bar");
 603         test_cond("Strings concatenation",
 604             sdslen(x) == 5 && memcmp(x,"fobar\0",6) == 0);
 605
 606         x = sdscpy(x,"a");
 607         test_cond("sdscpy() against an originally longer string",
 608             sdslen(x) == 1 && memcmp(x,"a\0",2) == 0)
 609
 610         x = sdscpy(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk");
 611         test_cond("sdscpy() against an originally shorter string",
 612             sdslen(x) == 33 &&
 613             memcmp(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk\0",33) == 0)
 614
 615         sdsfree(x);
 616         x = sdscatprintf(sdsempty(),"%d",123);
 617         test_cond("sdscatprintf() seems working in the base case",
 618             sdslen(x) == 3 && memcmp(x,"123\0",4) ==0)
 619
 620         sdsfree(x);
 621         x = sdstrim(sdsnew("xxciaoyyy"),"xy");
 622         test_cond("sdstrim() correctly trims characters",
 623             sdslen(x) == 4 && memcmp(x,"ciao\0",5) == 0)
 624
 625         y = sdsrange(sdsdup(x),1,1);
 626         test_cond("sdsrange(...,1,1)",
 627             sdslen(y) == 1 && memcmp(y,"i\0",2) == 0)
 628
 629         sdsfree(y);
 630         y = sdsrange(sdsdup(x),1,-1);
 631         test_cond("sdsrange(...,1,-1)",
 632             sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0)
 633
 634         sdsfree(y);
 635         y = sdsrange(sdsdup(x),-2,-1);
 636         test_cond("sdsrange(...,-2,-1)",
 637             sdslen(y) == 2 && memcmp(y,"ao\0",3) == 0)
 638
 639         sdsfree(y);
 640         y = sdsrange(sdsdup(x),2,1);
 641         test_cond("sdsrange(...,2,1)",
 642             sdslen(y) == 0 && memcmp(y,"\0",1) == 0)
 643
 644         sdsfree(y);
 645         y = sdsrange(sdsdup(x),1,100);
 646         test_cond("sdsrange(...,1,100)",
 647             sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0)
 648
 649         sdsfree(y);
 650         y = sdsrange(sdsdup(x),100,100);
 651         test_cond("sdsrange(...,100,100)",
 652             sdslen(y) == 0 && memcmp(y,"\0",1) == 0)
 653
 654         sdsfree(y);
 655         sdsfree(x);
 656         x = sdsnew("foo");
 657         y = sdsnew("foa");
 658         test_cond("sdscmp(foo,foa)", sdscmp(x,y) > 0)
 659
 660         sdsfree(y);
 661         sdsfree(x);
 662         x = sdsnew("bar");
 663         y = sdsnew("bar");
 664         test_cond("sdscmp(bar,bar)", sdscmp(x,y) == 0)
 665
 666         sdsfree(y);
 667         sdsfree(x);
 668         x = sdsnew("aar");
 669         y = sdsnew("bar");
 670         test_cond("sdscmp(bar,bar)", sdscmp(x,y) < 0)
 671     }
 672     test_report()
 673 }
 674 #endif