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 /* Enlarge the free space at the end of the sds string so that the caller
 105  * is sure that after calling this function can overwrite up to addlen
 106  * bytes after the end of the string, plus one more byte for nul term.
 107  *
 108  * Note: this does not change the *size* of the sds string as returned
 109  * by sdslen(), but only the free buffer space we have. */
 110 static sds sdsMakeRoomFor(sds s, size_t addlen) {
 111     struct sdshdr *sh, *newsh;
 112     size_t free = sdsavail(s);
 113     size_t len, newlen;
 114
 115     if (free >= addlen) return s;
 116     len = sdslen(s);
 117     sh = (void*) (s-(sizeof(struct sdshdr)));
 118     newlen = (len+addlen)*2;
 119     newsh = zrealloc(sh, sizeof(struct sdshdr)+newlen+1);
 120 #ifdef SDS_ABORT_ON_OOM
 121     if (newsh == NULL) sdsOomAbort();
 122 #else
 123     if (newsh == NULL) return NULL;
 124 #endif
 125
 126     newsh->free = newlen - len;
 127     return newsh->buf;
 128 }
 129
 130 /* Grow the sds to have the specified length. Bytes that were not part of
 131  * the original length of the sds will be set to zero. */
 132 sds sdsgrowzero(sds s, size_t len) {
 133     struct sdshdr *sh = (void*)(s-(sizeof(struct sdshdr)));
 134     size_t totlen, curlen = sh->len;
 135
 136     if (len <= curlen) return s;
 137     s = sdsMakeRoomFor(s,len-curlen);
 138     if (s == NULL) return NULL;
 139
 140     /* Make sure added region doesn't contain garbage */
 141     sh = (void*)(s-(sizeof(struct sdshdr)));
 142     memset(s+curlen,0,(len-curlen+1)); /* also set trailing \0 byte */
 143     totlen = sh->len+sh->free;
 144     sh->len = len;
 145     sh->free = totlen-sh->len;
 146     return s;
 147 }
 148
 149 sds sdscatlen(sds s, void *t, size_t len) {
 150     struct sdshdr *sh;
 151     size_t curlen = sdslen(s);
 152
 153     s = sdsMakeRoomFor(s,len);
 154     if (s == NULL) return NULL;
 155     sh = (void*) (s-(sizeof(struct sdshdr)));
 156     memcpy(s+curlen, t, len);
 157     sh->len = curlen+len;
 158     sh->free = sh->free-len;
 159     s[curlen+len] = '\0';
 160     return s;
 161 }
 162
 163 sds sdscat(sds s, char *t) {
 164     return sdscatlen(s, t, strlen(t));
 165 }
 166
 167 sds sdscpylen(sds s, char *t, size_t len) {
 168     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 169     size_t totlen = sh->free+sh->len;
 170
 171     if (totlen < len) {
 172         s = sdsMakeRoomFor(s,len-sh->len);
 173         if (s == NULL) return NULL;
 174         sh = (void*) (s-(sizeof(struct sdshdr)));
 175         totlen = sh->free+sh->len;
 176     }
 177     memcpy(s, t, len);
 178     s[len] = '\0';
 179     sh->len = len;
 180     sh->free = totlen-len;
 181     return s;
 182 }
 183
 184 sds sdscpy(sds s, char *t) {
 185     return sdscpylen(s, t, strlen(t));
 186 }
 187
 188 sds sdscatvprintf(sds s, const char *fmt, va_list ap) {
 189     va_list cpy;
 190     char *buf, *t;
 191     size_t buflen = 16;
 192
 193     while(1) {
 194         buf = zmalloc(buflen);
 195 #ifdef SDS_ABORT_ON_OOM
 196         if (buf == NULL) sdsOomAbort();
 197 #else
 198         if (buf == NULL) return NULL;
 199 #endif
 200         buf[buflen-2] = '\0';
 201         va_copy(cpy,ap);
 202         vsnprintf(buf, buflen, fmt, cpy);
 203         if (buf[buflen-2] != '\0') {
 204             zfree(buf);
 205             buflen *= 2;
 206             continue;
 207         }
 208         break;
 209     }
 210     t = sdscat(s, buf);
 211     zfree(buf);
 212     return t;
 213 }
 214
 215 sds sdscatprintf(sds s, const char *fmt, ...) {
 216     va_list ap;
 217     char *t;
 218     va_start(ap, fmt);
 219     t = sdscatvprintf(s,fmt,ap);
 220     va_end(ap);
 221     return t;
 222 }
 223
 224 sds sdstrim(sds s, const char *cset) {
 225     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 226     char *start, *end, *sp, *ep;
 227     size_t len;
 228
 229     sp = start = s;
 230     ep = end = s+sdslen(s)-1;
 231     while(sp <= end && strchr(cset, *sp)) sp++;
 232     while(ep > start && strchr(cset, *ep)) ep--;
 233     len = (sp > ep) ? 0 : ((ep-sp)+1);
 234     if (sh->buf != sp) memmove(sh->buf, sp, len);
 235     sh->buf[len] = '\0';
 236     sh->free = sh->free+(sh->len-len);
 237     sh->len = len;
 238     return s;
 239 }
 240
 241 sds sdsrange(sds s, int start, int end) {
 242     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 243     size_t newlen, len = sdslen(s);
 244
 245     if (len == 0) return s;
 246     if (start < 0) {
 247         start = len+start;
 248         if (start < 0) start = 0;
 249     }
 250     if (end < 0) {
 251         end = len+end;
 252         if (end < 0) end = 0;
 253     }
 254     newlen = (start > end) ? 0 : (end-start)+1;
 255     if (newlen != 0) {
 256         if (start >= (signed)len) {
 257             newlen = 0;
 258         } else if (end >= (signed)len) {
 259             end = len-1;
 260             newlen = (start > end) ? 0 : (end-start)+1;
 261         }
 262     } else {
 263         start = 0;
 264     }
 265     if (start && newlen) memmove(sh->buf, sh->buf+start, newlen);
 266     sh->buf[newlen] = 0;
 267     sh->free = sh->free+(sh->len-newlen);
 268     sh->len = newlen;
 269     return s;
 270 }
 271
 272 void sdstolower(sds s) {
 273     int len = sdslen(s), j;
 274
 275     for (j = 0; j < len; j++) s[j] = tolower(s[j]);
 276 }
 277
 278 void sdstoupper(sds s) {
 279     int len = sdslen(s), j;
 280
 281     for (j = 0; j < len; j++) s[j] = toupper(s[j]);
 282 }
 283
 284 int sdscmp(sds s1, sds s2) {
 285     size_t l1, l2, minlen;
 286     int cmp;
 287
 288     l1 = sdslen(s1);
 289     l2 = sdslen(s2);
 290     minlen = (l1 < l2) ? l1 : l2;
 291     cmp = memcmp(s1,s2,minlen);
 292     if (cmp == 0) return l1-l2;
 293     return cmp;
 294 }
 295
 296 /* Split 's' with separator in 'sep'. An array
 297  * of sds strings is returned. *count will be set
 298  * by reference to the number of tokens returned.
 299  *
 300  * On out of memory, zero length string, zero length
 301  * separator, NULL is returned.
 302  *
 303  * Note that 'sep' is able to split a string using
 304  * a multi-character separator. For example
 305  * sdssplit("foo_-_bar","_-_"); will return two
 306  * elements "foo" and "bar".
 307  *
 308  * This version of the function is binary-safe but
 309  * requires length arguments. sdssplit() is just the
 310  * same function but for zero-terminated strings.
 311  */
 312 sds *sdssplitlen(char *s, int len, char *sep, int seplen, int *count) {
 313     int elements = 0, slots = 5, start = 0, j;
 314     sds *tokens;
 315
 316     if (seplen < 1 || len < 0) return NULL;
 317
 318     tokens = zmalloc(sizeof(sds)*slots);
 319 #ifdef SDS_ABORT_ON_OOM
 320     if (tokens == NULL) sdsOomAbort();
 321 #else
 322     if (tokens == NULL) return NULL;
 323 #endif
 324
 325     if (len == 0) {
 326         *count = 0;
 327         return tokens;
 328     }
 329     for (j = 0; j < (len-(seplen-1)); j++) {
 330         /* make sure there is room for the next element and the final one */
 331         if (slots < elements+2) {
 332             sds *newtokens;
 333
 334             slots *= 2;
 335             newtokens = zrealloc(tokens,sizeof(sds)*slots);
 336             if (newtokens == NULL) {
 337 #ifdef SDS_ABORT_ON_OOM
 338                 sdsOomAbort();
 339 #else
 340                 goto cleanup;
 341 #endif
 342             }
 343             tokens = newtokens;
 344         }
 345         /* search the separator */
 346         if ((seplen == 1 && *(s+j) == sep[0]) || (memcmp(s+j,sep,seplen) == 0)) {
 347             tokens[elements] = sdsnewlen(s+start,j-start);
 348             if (tokens[elements] == NULL) {
 349 #ifdef SDS_ABORT_ON_OOM
 350                 sdsOomAbort();
 351 #else
 352                 goto cleanup;
 353 #endif
 354             }
 355             elements++;
 356             start = j+seplen;
 357             j = j+seplen-1; /* skip the separator */
 358         }
 359     }
 360     /* Add the final element. We are sure there is room in the tokens array. */
 361     tokens[elements] = sdsnewlen(s+start,len-start);
 362     if (tokens[elements] == NULL) {
 363 #ifdef SDS_ABORT_ON_OOM
 364                 sdsOomAbort();
 365 #else
 366                 goto cleanup;
 367 #endif
 368     }
 369     elements++;
 370     *count = elements;
 371     return tokens;
 372
 373 #ifndef SDS_ABORT_ON_OOM
 374 cleanup:
 375     {
 376         int i;
 377         for (i = 0; i < elements; i++) sdsfree(tokens[i]);
 378         zfree(tokens);
 379         *count = 0;
 380         return NULL;
 381     }
 382 #endif
 383 }
 384
 385 void sdsfreesplitres(sds *tokens, int count) {
 386     if (!tokens) return;
 387     while(count--)
 388         sdsfree(tokens[count]);
 389     zfree(tokens);
 390 }
 391
 392 sds sdsfromlonglong(long long value) {
 393     char buf[32], *p;
 394     unsigned long long v;
 395
 396     v = (value < 0) ? -value : value;
 397     p = buf+31; /* point to the last character */
 398     do {
 399         *p-- = '0'+(v%10);
 400         v /= 10;
 401     } while(v);
 402     if (value < 0) *p-- = '-';
 403     p++;
 404     return sdsnewlen(p,32-(p-buf));
 405 }
 406
 407 sds sdscatrepr(sds s, char *p, size_t len) {
 408     s = sdscatlen(s,"\"",1);
 409     while(len--) {
 410         switch(*p) {
 411         case '\\':
 412         case '"':
 413             s = sdscatprintf(s,"\\%c",*p);
 414             break;
 415         case '\n': s = sdscatlen(s,"\\n",2); break;
 416         case '\r': s = sdscatlen(s,"\\r",2); break;
 417         case '\t': s = sdscatlen(s,"\\t",2); break;
 418         case '\a': s = sdscatlen(s,"\\a",2); break;
 419         case '\b': s = sdscatlen(s,"\\b",2); break;
 420         default:
 421             if (isprint(*p))
 422                 s = sdscatprintf(s,"%c",*p);
 423             else
 424                 s = sdscatprintf(s,"\\x%02x",(unsigned char)*p);
 425             break;
 426         }
 427         p++;
 428     }
 429     return sdscatlen(s,"\"",1);
 430 }
 431
 432 /* Helper function for sdssplitargs() that returns non zero if 'c'
 433  * is a valid hex digit. */
 434 int is_hex_digit(char c) {
 435     return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') ||
 436            (c >= 'A' && c <= 'F');
 437 }
 438
 439 /* Helper function for sdssplitargs() that converts an hex digit into an
 440  * integer from 0 to 15 */
 441 int hex_digit_to_int(char c) {
 442     switch(c) {
 443     case '0': return 0;
 444     case '1': return 1;
 445     case '2': return 2;
 446     case '3': return 3;
 447     case '4': return 4;
 448     case '5': return 5;
 449     case '6': return 6;
 450     case '7': return 7;
 451     case '8': return 8;
 452     case '9': return 9;
 453     case 'a': case 'A': return 10;
 454     case 'b': case 'B': return 11;
 455     case 'c': case 'C': return 12;
 456     case 'd': case 'D': return 13;
 457     case 'e': case 'E': return 14;
 458     case 'f': case 'F': return 15;
 459     default: return 0;
 460     }
 461 }
 462
 463 /* Split a line into arguments, where every argument can be in the
 464  * following programming-language REPL-alike form:
 465  *
 466  * foo bar "newline are supported\n" and "\xff\x00otherstuff"
 467  *
 468  * The number of arguments is stored into *argc, and an array
 469  * of sds is returned. The caller should sdsfree() all the returned
 470  * strings and finally zfree() the array itself.
 471  *
 472  * Note that sdscatrepr() is able to convert back a string into
 473  * a quoted string in the same format sdssplitargs() is able to parse.
 474  */
 475 sds *sdssplitargs(char *line, int *argc) {
 476     char *p = line;
 477     char *current = NULL;
 478     char **vector = NULL;
 479
 480     *argc = 0;
 481     while(1) {
 482         /* skip blanks */
 483         while(*p && isspace(*p)) p++;
 484         if (*p) {
 485             /* get a token */
 486             int inq=0;  /* set to 1 if we are in "quotes" */
 487             int insq=0; /* set to 1 if we are in 'single quotes' */
 488             int done=0;
 489
 490             if (current == NULL) current = sdsempty();
 491             while(!done) {
 492                 if (inq) {
 493                     if (*p == '\\' && *(p+1) == 'x' &&
 494                                              is_hex_digit(*(p+2)) &&
 495                                              is_hex_digit(*(p+3)))
 496                     {
 497                         unsigned char byte;
 498
 499                         byte = (hex_digit_to_int(*(p+2))*16)+
 500                                 hex_digit_to_int(*(p+3));
 501                         current = sdscatlen(current,(char*)&byte,1);
 502                         p += 3;
 503                     } else if (*p == '\\' && *(p+1)) {
 504                         char c;
 505
 506                         p++;
 507                         switch(*p) {
 508                         case 'n': c = '\n'; break;
 509                         case 'r': c = '\r'; break;
 510                         case 't': c = '\t'; break;
 511                         case 'b': c = '\b'; break;
 512                         case 'a': c = '\a'; break;
 513                         default: c = *p; break;
 514                         }
 515                         current = sdscatlen(current,&c,1);
 516                     } else if (*p == '"') {
 517                         /* closing quote must be followed by a space or
 518                          * nothing at all. */
 519                         if (*(p+1) && !isspace(*(p+1))) goto err;
 520                         done=1;
 521                     } else if (!*p) {
 522                         /* unterminated quotes */
 523                         goto err;
 524                     } else {
 525                         current = sdscatlen(current,p,1);
 526                     }
 527                 } else if (insq) {
 528                     if (*p == '\\' && *(p+1) == '\'') {
 529                         p++;
 530                         current = sdscatlen(current,"'",1);
 531                     } else if (*p == '\'') {
 532                         /* closing quote must be followed by a space or
 533                          * nothing at all. */
 534                         if (*(p+1) && !isspace(*(p+1))) goto err;
 535                         done=1;
 536                     } else if (!*p) {
 537                         /* unterminated quotes */
 538                         goto err;
 539                     } else {
 540                         current = sdscatlen(current,p,1);
 541                     }
 542                 } else {
 543                     switch(*p) {
 544                     case ' ':
 545                     case '\n':
 546                     case '\r':
 547                     case '\t':
 548                     case '\0':
 549                         done=1;
 550                         break;
 551                     case '"':
 552                         inq=1;
 553                         break;
 554                     case '\'':
 555                         insq=1;
 556                         break;
 557                     default:
 558                         current = sdscatlen(current,p,1);
 559                         break;
 560                     }
 561                 }
 562                 if (*p) p++;
 563             }
 564             /* add the token to the vector */
 565             vector = zrealloc(vector,((*argc)+1)*sizeof(char*));
 566             vector[*argc] = current;
 567             (*argc)++;
 568             current = NULL;
 569         } else {
 570             return vector;
 571         }
 572     }
 573
 574 err:
 575     while((*argc)--)
 576         sdsfree(vector[*argc]);
 577     zfree(vector);
 578     if (current) sdsfree(current);
 579     return NULL;
 580 }
 581
 582 void sdssplitargs_free(sds *argv, int argc) {
 583     int j;
 584
 585     for (j = 0 ;j < argc; j++) sdsfree(argv[j]);
 586     zfree(argv);
 587 }
 588
 589 /* Modify the string substituting all the occurrences of the set of
 590  * characters specifed in the 'from' string to the corresponding character
 591  * in the 'to' array.
 592  *
 593  * For instance: sdsmapchars(mystring, "ho", "01", 2)
 594  * will have the effect of turning the string "hello" into "0ell1".
 595  *
 596  * The function returns the sds string pointer, that is always the same
 597  * as the input pointer since no resize is needed. */
 598 sds sdsmapchars(sds s, char *from, char *to, size_t setlen) {
 599     size_t j, i, l = sdslen(s);
 600
 601     for (j = 0; j < l; j++) {
 602         for (i = 0; i < setlen; i++) {
 603             if (s[j] == from[i]) {
 604                 s[j] = to[i];
 605                 break;
 606             }
 607         }
 608     }
 609     return s;
 610 }
 611
 612 #ifdef SDS_TEST_MAIN
 613 #include <stdio.h>
 614 #include "testhelp.h"
 615
 616 int main(void) {
 617     {
 618         sds x = sdsnew("foo"), y;
 619
 620         test_cond("Create a string and obtain the length",
 621             sdslen(x) == 3 && memcmp(x,"foo\0",4) == 0)
 622
 623         sdsfree(x);
 624         x = sdsnewlen("foo",2);
 625         test_cond("Create a string with specified length",
 626             sdslen(x) == 2 && memcmp(x,"fo\0",3) == 0)
 627
 628         x = sdscat(x,"bar");
 629         test_cond("Strings concatenation",
 630             sdslen(x) == 5 && memcmp(x,"fobar\0",6) == 0);
 631
 632         x = sdscpy(x,"a");
 633         test_cond("sdscpy() against an originally longer string",
 634             sdslen(x) == 1 && memcmp(x,"a\0",2) == 0)
 635
 636         x = sdscpy(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk");
 637         test_cond("sdscpy() against an originally shorter string",
 638             sdslen(x) == 33 &&
 639             memcmp(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk\0",33) == 0)
 640
 641         sdsfree(x);
 642         x = sdscatprintf(sdsempty(),"%d",123);
 643         test_cond("sdscatprintf() seems working in the base case",
 644             sdslen(x) == 3 && memcmp(x,"123\0",4) ==0)
 645
 646         sdsfree(x);
 647         x = sdstrim(sdsnew("xxciaoyyy"),"xy");
 648         test_cond("sdstrim() correctly trims characters",
 649             sdslen(x) == 4 && memcmp(x,"ciao\0",5) == 0)
 650
 651         y = sdsrange(sdsdup(x),1,1);
 652         test_cond("sdsrange(...,1,1)",
 653             sdslen(y) == 1 && memcmp(y,"i\0",2) == 0)
 654
 655         sdsfree(y);
 656         y = sdsrange(sdsdup(x),1,-1);
 657         test_cond("sdsrange(...,1,-1)",
 658             sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0)
 659
 660         sdsfree(y);
 661         y = sdsrange(sdsdup(x),-2,-1);
 662         test_cond("sdsrange(...,-2,-1)",
 663             sdslen(y) == 2 && memcmp(y,"ao\0",3) == 0)
 664
 665         sdsfree(y);
 666         y = sdsrange(sdsdup(x),2,1);
 667         test_cond("sdsrange(...,2,1)",
 668             sdslen(y) == 0 && memcmp(y,"\0",1) == 0)
 669
 670         sdsfree(y);
 671         y = sdsrange(sdsdup(x),1,100);
 672         test_cond("sdsrange(...,1,100)",
 673             sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0)
 674
 675         sdsfree(y);
 676         y = sdsrange(sdsdup(x),100,100);
 677         test_cond("sdsrange(...,100,100)",
 678             sdslen(y) == 0 && memcmp(y,"\0",1) == 0)
 679
 680         sdsfree(y);
 681         sdsfree(x);
 682         x = sdsnew("foo");
 683         y = sdsnew("foa");
 684         test_cond("sdscmp(foo,foa)", sdscmp(x,y) > 0)
 685
 686         sdsfree(y);
 687         sdsfree(x);
 688         x = sdsnew("bar");
 689         y = sdsnew("bar");
 690         test_cond("sdscmp(bar,bar)", sdscmp(x,y) == 0)
 691
 692         sdsfree(y);
 693         sdsfree(x);
 694         x = sdsnew("aar");
 695         y = sdsnew("bar");
 696         test_cond("sdscmp(bar,bar)", sdscmp(x,y) < 0)
 697     }
 698     test_report()
 699 }
 700 #endif