deps/hiredis/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 #define SDS_ABORT_ON_OOM
  32
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <ctype.h>
  37 #include "sds.h"
  38
  39 static void sdsOomAbort(void) {
  40     fprintf(stderr,"SDS: Out Of Memory (SDS_ABORT_ON_OOM defined)\n");
  41     abort();
  42 }
  43
  44 sds sdsnewlen(const void *init, size_t initlen) {
  45     struct sdshdr *sh;
  46
  47     sh = malloc(sizeof(struct sdshdr)+initlen+1);
  48 #ifdef SDS_ABORT_ON_OOM
  49     if (sh == NULL) sdsOomAbort();
  50 #else
  51     if (sh == NULL) return NULL;
  52 #endif
  53     sh->len = initlen;
  54     sh->free = 0;
  55     if (initlen) {
  56         if (init) memcpy(sh->buf, init, initlen);
  57         else memset(sh->buf,0,initlen);
  58     }
  59     sh->buf[initlen] = '\0';
  60     return (char*)sh->buf;
  61 }
  62
  63 sds sdsempty(void) {
  64     return sdsnewlen("",0);
  65 }
  66
  67 sds sdsnew(const char *init) {
  68     size_t initlen = (init == NULL) ? 0 : strlen(init);
  69     return sdsnewlen(init, initlen);
  70 }
  71
  72 sds sdsdup(const sds s) {
  73     return sdsnewlen(s, sdslen(s));
  74 }
  75
  76 void sdsfree(sds s) {
  77     if (s == NULL) return;
  78     free(s-sizeof(struct sdshdr));
  79 }
  80
  81 void sdsupdatelen(sds s) {
  82     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
  83     int reallen = strlen(s);
  84     sh->free += (sh->len-reallen);
  85     sh->len = reallen;
  86 }
  87
  88 static sds sdsMakeRoomFor(sds s, size_t addlen) {
  89     struct sdshdr *sh, *newsh;
  90     size_t free = sdsavail(s);
  91     size_t len, newlen;
  92
  93     if (free >= addlen) return s;
  94     len = sdslen(s);
  95     sh = (void*) (s-(sizeof(struct sdshdr)));
  96     newlen = (len+addlen)*2;
  97     newsh = realloc(sh, sizeof(struct sdshdr)+newlen+1);
  98 #ifdef SDS_ABORT_ON_OOM
  99     if (newsh == NULL) sdsOomAbort();
 100 #else
 101     if (newsh == NULL) return NULL;
 102 #endif
 103
 104     newsh->free = newlen - len;
 105     return newsh->buf;
 106 }
 107
 108 /* Grow the sds to have the specified length. Bytes that were not part of
 109  * the original length of the sds will be set to zero. */
 110 sds sdsgrowzero(sds s, size_t len) {
 111     struct sdshdr *sh = (void*)(s-(sizeof(struct sdshdr)));
 112     size_t totlen, curlen = sh->len;
 113
 114     if (len <= curlen) return s;
 115     s = sdsMakeRoomFor(s,len-curlen);
 116     if (s == NULL) return NULL;
 117
 118     /* Make sure added region doesn't contain garbage */
 119     sh = (void*)(s-(sizeof(struct sdshdr)));
 120     memset(s+curlen,0,(len-curlen+1)); /* also set trailing \0 byte */
 121     totlen = sh->len+sh->free;
 122     sh->len = len;
 123     sh->free = totlen-sh->len;
 124     return s;
 125 }
 126
 127 sds sdscatlen(sds s, const void *t, size_t len) {
 128     struct sdshdr *sh;
 129     size_t curlen = sdslen(s);
 130
 131     s = sdsMakeRoomFor(s,len);
 132     if (s == NULL) return NULL;
 133     sh = (void*) (s-(sizeof(struct sdshdr)));
 134     memcpy(s+curlen, t, len);
 135     sh->len = curlen+len;
 136     sh->free = sh->free-len;
 137     s[curlen+len] = '\0';
 138     return s;
 139 }
 140
 141 sds sdscat(sds s, const char *t) {
 142     return sdscatlen(s, t, strlen(t));
 143 }
 144
 145 sds sdscpylen(sds s, char *t, size_t len) {
 146     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 147     size_t totlen = sh->free+sh->len;
 148
 149     if (totlen < len) {
 150         s = sdsMakeRoomFor(s,len-sh->len);
 151         if (s == NULL) return NULL;
 152         sh = (void*) (s-(sizeof(struct sdshdr)));
 153         totlen = sh->free+sh->len;
 154     }
 155     memcpy(s, t, len);
 156     s[len] = '\0';
 157     sh->len = len;
 158     sh->free = totlen-len;
 159     return s;
 160 }
 161
 162 sds sdscpy(sds s, char *t) {
 163     return sdscpylen(s, t, strlen(t));
 164 }
 165
 166 sds sdscatvprintf(sds s, const char *fmt, va_list ap) {
 167     va_list cpy;
 168     char *buf, *t;
 169     size_t buflen = 16;
 170
 171     while(1) {
 172         buf = malloc(buflen);
 173 #ifdef SDS_ABORT_ON_OOM
 174         if (buf == NULL) sdsOomAbort();
 175 #else
 176         if (buf == NULL) return NULL;
 177 #endif
 178         buf[buflen-2] = '\0';
 179         va_copy(cpy,ap);
 180         vsnprintf(buf, buflen, fmt, cpy);
 181         if (buf[buflen-2] != '\0') {
 182             free(buf);
 183             buflen *= 2;
 184             continue;
 185         }
 186         break;
 187     }
 188     t = sdscat(s, buf);
 189     free(buf);
 190     return t;
 191 }
 192
 193 sds sdscatprintf(sds s, const char *fmt, ...) {
 194     va_list ap;
 195     char *t;
 196     va_start(ap, fmt);
 197     t = sdscatvprintf(s,fmt,ap);
 198     va_end(ap);
 199     return t;
 200 }
 201
 202 sds sdstrim(sds s, const char *cset) {
 203     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 204     char *start, *end, *sp, *ep;
 205     size_t len;
 206
 207     sp = start = s;
 208     ep = end = s+sdslen(s)-1;
 209     while(sp <= end && strchr(cset, *sp)) sp++;
 210     while(ep > start && strchr(cset, *ep)) ep--;
 211     len = (sp > ep) ? 0 : ((ep-sp)+1);
 212     if (sh->buf != sp) memmove(sh->buf, sp, len);
 213     sh->buf[len] = '\0';
 214     sh->free = sh->free+(sh->len-len);
 215     sh->len = len;
 216     return s;
 217 }
 218
 219 sds sdsrange(sds s, int start, int end) {
 220     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 221     size_t newlen, len = sdslen(s);
 222
 223     if (len == 0) return s;
 224     if (start < 0) {
 225         start = len+start;
 226         if (start < 0) start = 0;
 227     }
 228     if (end < 0) {
 229         end = len+end;
 230         if (end < 0) end = 0;
 231     }
 232     newlen = (start > end) ? 0 : (end-start)+1;
 233     if (newlen != 0) {
 234         if (start >= (signed)len) {
 235             newlen = 0;
 236         } else if (end >= (signed)len) {
 237             end = len-1;
 238             newlen = (start > end) ? 0 : (end-start)+1;
 239         }
 240     } else {
 241         start = 0;
 242     }
 243     if (start && newlen) memmove(sh->buf, sh->buf+start, newlen);
 244     sh->buf[newlen] = 0;
 245     sh->free = sh->free+(sh->len-newlen);
 246     sh->len = newlen;
 247     return s;
 248 }
 249
 250 void sdstolower(sds s) {
 251     int len = sdslen(s), j;
 252
 253     for (j = 0; j < len; j++) s[j] = tolower(s[j]);
 254 }
 255
 256 void sdstoupper(sds s) {
 257     int len = sdslen(s), j;
 258
 259     for (j = 0; j < len; j++) s[j] = toupper(s[j]);
 260 }
 261
 262 int sdscmp(sds s1, sds s2) {
 263     size_t l1, l2, minlen;
 264     int cmp;
 265
 266     l1 = sdslen(s1);
 267     l2 = sdslen(s2);
 268     minlen = (l1 < l2) ? l1 : l2;
 269     cmp = memcmp(s1,s2,minlen);
 270     if (cmp == 0) return l1-l2;
 271     return cmp;
 272 }
 273
 274 /* Split 's' with separator in 'sep'. An array
 275  * of sds strings is returned. *count will be set
 276  * by reference to the number of tokens returned.
 277  *
 278  * On out of memory, zero length string, zero length
 279  * separator, NULL is returned.
 280  *
 281  * Note that 'sep' is able to split a string using
 282  * a multi-character separator. For example
 283  * sdssplit("foo_-_bar","_-_"); will return two
 284  * elements "foo" and "bar".
 285  *
 286  * This version of the function is binary-safe but
 287  * requires length arguments. sdssplit() is just the
 288  * same function but for zero-terminated strings.
 289  */
 290 sds *sdssplitlen(char *s, int len, char *sep, int seplen, int *count) {
 291     int elements = 0, slots = 5, start = 0, j;
 292
 293     sds *tokens = malloc(sizeof(sds)*slots);
 294 #ifdef SDS_ABORT_ON_OOM
 295     if (tokens == NULL) sdsOomAbort();
 296 #endif
 297     if (seplen < 1 || len < 0 || tokens == NULL) return NULL;
 298     if (len == 0) {
 299         *count = 0;
 300         return tokens;
 301     }
 302     for (j = 0; j < (len-(seplen-1)); j++) {
 303         /* make sure there is room for the next element and the final one */
 304         if (slots < elements+2) {
 305             sds *newtokens;
 306
 307             slots *= 2;
 308             newtokens = realloc(tokens,sizeof(sds)*slots);
 309             if (newtokens == NULL) {
 310 #ifdef SDS_ABORT_ON_OOM
 311                 sdsOomAbort();
 312 #else
 313                 goto cleanup;
 314 #endif
 315             }
 316             tokens = newtokens;
 317         }
 318         /* search the separator */
 319         if ((seplen == 1 && *(s+j) == sep[0]) || (memcmp(s+j,sep,seplen) == 0)) {
 320             tokens[elements] = sdsnewlen(s+start,j-start);
 321             if (tokens[elements] == NULL) {
 322 #ifdef SDS_ABORT_ON_OOM
 323                 sdsOomAbort();
 324 #else
 325                 goto cleanup;
 326 #endif
 327             }
 328             elements++;
 329             start = j+seplen;
 330             j = j+seplen-1; /* skip the separator */
 331         }
 332     }
 333     /* Add the final element. We are sure there is room in the tokens array. */
 334     tokens[elements] = sdsnewlen(s+start,len-start);
 335     if (tokens[elements] == NULL) {
 336 #ifdef SDS_ABORT_ON_OOM
 337                 sdsOomAbort();
 338 #else
 339                 goto cleanup;
 340 #endif
 341     }
 342     elements++;
 343     *count = elements;
 344     return tokens;
 345
 346 #ifndef SDS_ABORT_ON_OOM
 347 cleanup:
 348     {
 349         int i;
 350         for (i = 0; i < elements; i++) sdsfree(tokens[i]);
 351         free(tokens);
 352         return NULL;
 353     }
 354 #endif
 355 }
 356
 357 void sdsfreesplitres(sds *tokens, int count) {
 358     if (!tokens) return;
 359     while(count--)
 360         sdsfree(tokens[count]);
 361     free(tokens);
 362 }
 363
 364 sds sdsfromlonglong(long long value) {
 365     char buf[32], *p;
 366     unsigned long long v;
 367
 368     v = (value < 0) ? -value : value;
 369     p = buf+31; /* point to the last character */
 370     do {
 371         *p-- = '0'+(v%10);
 372         v /= 10;
 373     } while(v);
 374     if (value < 0) *p-- = '-';
 375     p++;
 376     return sdsnewlen(p,32-(p-buf));
 377 }
 378
 379 sds sdscatrepr(sds s, char *p, size_t len) {
 380     s = sdscatlen(s,"\"",1);
 381     while(len--) {
 382         switch(*p) {
 383         case '\\':
 384         case '"':
 385             s = sdscatprintf(s,"\\%c",*p);
 386             break;
 387         case '\n': s = sdscatlen(s,"\\n",1); break;
 388         case '\r': s = sdscatlen(s,"\\r",1); break;
 389         case '\t': s = sdscatlen(s,"\\t",1); break;
 390         case '\a': s = sdscatlen(s,"\\a",1); break;
 391         case '\b': s = sdscatlen(s,"\\b",1); break;
 392         default:
 393             if (isprint(*p))
 394                 s = sdscatprintf(s,"%c",*p);
 395             else
 396                 s = sdscatprintf(s,"\\x%02x",(unsigned char)*p);
 397             break;
 398         }
 399         p++;
 400     }
 401     return sdscatlen(s,"\"",1);
 402 }
 403
 404 /* Split a line into arguments, where every argument can be in the
 405  * following programming-language REPL-alike form:
 406  *
 407  * foo bar "newline are supported\n" and "\xff\x00otherstuff"
 408  *
 409  * The number of arguments is stored into *argc, and an array
 410  * of sds is returned. The caller should sdsfree() all the returned
 411  * strings and finally free() the array itself.
 412  *
 413  * Note that sdscatrepr() is able to convert back a string into
 414  * a quoted string in the same format sdssplitargs() is able to parse.
 415  */
 416 sds *sdssplitargs(char *line, int *argc) {
 417     char *p = line;
 418     char *current = NULL;
 419     char **vector = NULL;
 420
 421     *argc = 0;
 422     while(1) {
 423         /* skip blanks */
 424         while(*p && isspace(*p)) p++;
 425         if (*p) {
 426             /* get a token */
 427             int inq=0; /* set to 1 if we are in "quotes" */
 428             int done=0;
 429
 430             if (current == NULL) current = sdsempty();
 431             while(!done) {
 432                 if (inq) {
 433                     if (*p == '\\' && *(p+1)) {
 434                         char c;
 435
 436                         p++;
 437                         switch(*p) {
 438                         case 'n': c = '\n'; break;
 439                         case 'r': c = '\r'; break;
 440                         case 't': c = '\t'; break;
 441                         case 'b': c = '\b'; break;
 442                         case 'a': c = '\a'; break;
 443                         default: c = *p; break;
 444                         }
 445                         current = sdscatlen(current,&c,1);
 446                     } else if (*p == '"') {
 447                         /* closing quote must be followed by a space */
 448                         if (*(p+1) && !isspace(*(p+1))) goto err;
 449                         done=1;
 450                     } else if (!*p) {
 451                         /* unterminated quotes */
 452                         goto err;
 453                     } else {
 454                         current = sdscatlen(current,p,1);
 455                     }
 456                 } else {
 457                     switch(*p) {
 458                     case ' ':
 459                     case '\n':
 460                     case '\r':
 461                     case '\t':
 462                     case '\0':
 463                         done=1;
 464                         break;
 465                     case '"':
 466                         inq=1;
 467                         break;
 468                     default:
 469                         current = sdscatlen(current,p,1);
 470                         break;
 471                     }
 472                 }
 473                 if (*p) p++;
 474             }
 475             /* add the token to the vector */
 476             vector = realloc(vector,((*argc)+1)*sizeof(char*));
 477             vector[*argc] = current;
 478             (*argc)++;
 479             current = NULL;
 480         } else {
 481             return vector;
 482         }
 483     }
 484
 485 err:
 486     while((*argc)--)
 487         sdsfree(vector[*argc]);
 488     free(vector);
 489     if (current) sdsfree(current);
 490     return NULL;
 491 }
 492
 493 #ifdef SDS_TEST_MAIN
 494 #include <stdio.h>
 495
 496 int __failed_tests = 0;
 497 int __test_num = 0;
 498 #define test_cond(descr,_c) do { \
 499     __test_num++; printf("%d - %s: ", __test_num, descr); \
 500     if(_c) printf("PASSED\n"); else {printf("FAILED\n"); __failed_tests++;} \
 501 } while(0);
 502 #define test_report() do { \
 503     printf("%d tests, %d passed, %d failed\n", __test_num, \
 504                     __test_num-__failed_tests, __failed_tests); \
 505     if (__failed_tests) { \
 506         printf("=== WARNING === We have failed tests here...\n"); \
 507     } \
 508 } while(0);
 509
 510 int main(void) {
 511     {
 512         sds x = sdsnew("foo"), y;
 513
 514         test_cond("Create a string and obtain the length",
 515             sdslen(x) == 3 && memcmp(x,"foo\0",4) == 0)
 516
 517         sdsfree(x);
 518         x = sdsnewlen("foo",2);
 519         test_cond("Create a string with specified length",
 520             sdslen(x) == 2 && memcmp(x,"fo\0",3) == 0)
 521
 522         x = sdscat(x,"bar");
 523         test_cond("Strings concatenation",
 524             sdslen(x) == 5 && memcmp(x,"fobar\0",6) == 0);
 525
 526         x = sdscpy(x,"a");
 527         test_cond("sdscpy() against an originally longer string",
 528             sdslen(x) == 1 && memcmp(x,"a\0",2) == 0)
 529
 530         x = sdscpy(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk");
 531         test_cond("sdscpy() against an originally shorter string",
 532             sdslen(x) == 33 &&
 533             memcmp(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk\0",33) == 0)
 534
 535         sdsfree(x);
 536         x = sdscatprintf(sdsempty(),"%d",123);
 537         test_cond("sdscatprintf() seems working in the base case",
 538             sdslen(x) == 3 && memcmp(x,"123\0",4) ==0)
 539
 540         sdsfree(x);
 541         x = sdstrim(sdsnew("xxciaoyyy"),"xy");
 542         test_cond("sdstrim() correctly trims characters",
 543             sdslen(x) == 4 && memcmp(x,"ciao\0",5) == 0)
 544
 545         y = sdsrange(sdsdup(x),1,1);
 546         test_cond("sdsrange(...,1,1)",
 547             sdslen(y) == 1 && memcmp(y,"i\0",2) == 0)
 548
 549         sdsfree(y);
 550         y = sdsrange(sdsdup(x),1,-1);
 551         test_cond("sdsrange(...,1,-1)",
 552             sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0)
 553
 554         sdsfree(y);
 555         y = sdsrange(sdsdup(x),-2,-1);
 556         test_cond("sdsrange(...,-2,-1)",
 557             sdslen(y) == 2 && memcmp(y,"ao\0",3) == 0)
 558
 559         sdsfree(y);
 560         y = sdsrange(sdsdup(x),2,1);
 561         test_cond("sdsrange(...,2,1)",
 562             sdslen(y) == 0 && memcmp(y,"\0",1) == 0)
 563
 564         sdsfree(y);
 565         y = sdsrange(sdsdup(x),1,100);
 566         test_cond("sdsrange(...,1,100)",
 567             sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0)
 568
 569         sdsfree(y);
 570         y = sdsrange(sdsdup(x),100,100);
 571         test_cond("sdsrange(...,100,100)",
 572             sdslen(y) == 0 && memcmp(y,"\0",1) == 0)
 573
 574         sdsfree(y);
 575         sdsfree(x);
 576         x = sdsnew("foo");
 577         y = sdsnew("foa");
 578         test_cond("sdscmp(foo,foa)", sdscmp(x,y) > 0)
 579
 580         sdsfree(y);
 581         sdsfree(x);
 582         x = sdsnew("bar");
 583         y = sdsnew("bar");
 584         test_cond("sdscmp(bar,bar)", sdscmp(x,y) == 0)
 585
 586         sdsfree(y);
 587         sdsfree(x);
 588         x = sdsnew("aar");
 589         y = sdsnew("bar");
 590         test_cond("sdscmp(bar,bar)", sdscmp(x,y) < 0)
 591     }
 592     test_report()
 593 }
 594 #endif