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