sds.c

   1 /* SDSLib, A C dynamic strings library
   2  *
   3  * Copyright (c) 2006-2009, 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 "sds.h"
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <stdarg.h>
  37 #include <string.h>
  38 #include <ctype.h>
  39 #include "zmalloc.h"
  40
  41 static void sdsOomAbort(void) {
  42     fprintf(stderr,"SDS: Out Of Memory (SDS_ABORT_ON_OOM defined)\n");
  43     abort();
  44 }
  45
  46 sds sdsnewlen(const void *init, size_t initlen) {
  47     struct sdshdr *sh;
  48
  49     sh = zmalloc(sizeof(struct sdshdr)+initlen+1);
  50 #ifdef SDS_ABORT_ON_OOM
  51     if (sh == NULL) sdsOomAbort();
  52 #else
  53     if (sh == NULL) return NULL;
  54 #endif
  55     sh->len = initlen;
  56     sh->free = 0;
  57     if (initlen) {
  58         if (init) memcpy(sh->buf, init, initlen);
  59         else memset(sh->buf,0,initlen);
  60     }
  61     sh->buf[initlen] = '\0';
  62     return (char*)sh->buf;
  63 }
  64
  65 sds sdsempty(void) {
  66     return sdsnewlen("",0);
  67 }
  68
  69 sds sdsnew(const char *init) {
  70     size_t initlen = (init == NULL) ? 0 : strlen(init);
  71     return sdsnewlen(init, initlen);
  72 }
  73
  74 size_t sdslen(const sds s) {
  75     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
  76     return sh->len;
  77 }
  78
  79 sds sdsdup(const sds s) {
  80     return sdsnewlen(s, sdslen(s));
  81 }
  82
  83 void sdsfree(sds s) {
  84     if (s == NULL) return;
  85     zfree(s-sizeof(struct sdshdr));
  86 }
  87
  88 size_t sdsavail(sds s) {
  89     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
  90     return sh->free;
  91 }
  92
  93 void sdsupdatelen(sds s) {
  94     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
  95     int reallen = strlen(s);
  96     sh->free += (sh->len-reallen);
  97     sh->len = reallen;
  98 }
  99
 100 static sds sdsMakeRoomFor(sds s, size_t addlen) {
 101     struct sdshdr *sh, *newsh;
 102     size_t free = sdsavail(s);
 103     size_t len, newlen;
 104
 105     if (free >= addlen) return s;
 106     len = sdslen(s);
 107     sh = (void*) (s-(sizeof(struct sdshdr)));
 108     newlen = (len+addlen)*2;
 109     newsh = zrealloc(sh, sizeof(struct sdshdr)+newlen+1);
 110 #ifdef SDS_ABORT_ON_OOM
 111     if (newsh == NULL) sdsOomAbort();
 112 #else
 113     if (newsh == NULL) return NULL;
 114 #endif
 115
 116     newsh->free = newlen - len;
 117     return newsh->buf;
 118 }
 119
 120 sds sdscatlen(sds s, void *t, size_t len) {
 121     struct sdshdr *sh;
 122     size_t curlen = sdslen(s);
 123
 124     s = sdsMakeRoomFor(s,len);
 125     if (s == NULL) return NULL;
 126     sh = (void*) (s-(sizeof(struct sdshdr)));
 127     memcpy(s+curlen, t, len);
 128     sh->len = curlen+len;
 129     sh->free = sh->free-len;
 130     s[curlen+len] = '\0';
 131     return s;
 132 }
 133
 134 sds sdscat(sds s, char *t) {
 135     return sdscatlen(s, t, strlen(t));
 136 }
 137
 138 sds sdscpylen(sds s, char *t, size_t len) {
 139     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 140     size_t totlen = sh->free+sh->len;
 141
 142     if (totlen < len) {
 143         s = sdsMakeRoomFor(s,len-totlen);
 144         if (s == NULL) return NULL;
 145         sh = (void*) (s-(sizeof(struct sdshdr)));
 146         totlen = sh->free+sh->len;
 147     }
 148     memcpy(s, t, len);
 149     s[len] = '\0';
 150     sh->len = len;
 151     sh->free = totlen-len;
 152     return s;
 153 }
 154
 155 sds sdscpy(sds s, char *t) {
 156     return sdscpylen(s, t, strlen(t));
 157 }
 158
 159 sds sdscatprintf(sds s, const char *fmt, ...) {
 160     va_list ap;
 161     char *buf, *t;
 162     size_t buflen = 32;
 163
 164     while(1) {
 165         buf = zmalloc(buflen);
 166 #ifdef SDS_ABORT_ON_OOM
 167         if (buf == NULL) sdsOomAbort();
 168 #else
 169         if (buf == NULL) return NULL;
 170 #endif
 171         buf[buflen-2] = '\0';
 172         va_start(ap, fmt);
 173         vsnprintf(buf, buflen, fmt, ap);
 174         va_end(ap);
 175         if (buf[buflen-2] != '\0') {
 176             zfree(buf);
 177             buflen *= 2;
 178             continue;
 179         }
 180         break;
 181     }
 182     t = sdscat(s, buf);
 183     zfree(buf);
 184     return t;
 185 }
 186
 187 sds sdstrim(sds s, const char *cset) {
 188     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 189     char *start, *end, *sp, *ep;
 190     size_t len;
 191
 192     sp = start = s;
 193     ep = end = s+sdslen(s)-1;
 194     while(sp <= end && strchr(cset, *sp)) sp++;
 195     while(ep > start && strchr(cset, *ep)) ep--;
 196     len = (sp > ep) ? 0 : ((ep-sp)+1);
 197     if (sh->buf != sp) memmove(sh->buf, sp, len);
 198     sh->buf[len] = '\0';
 199     sh->free = sh->free+(sh->len-len);
 200     sh->len = len;
 201     return s;
 202 }
 203
 204 sds sdsrange(sds s, long start, long end) {
 205     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
 206     size_t newlen, len = sdslen(s);
 207
 208     if (len == 0) return s;
 209     if (start < 0) {
 210         start = len+start;
 211         if (start < 0) start = 0;
 212     }
 213     if (end < 0) {
 214         end = len+end;
 215         if (end < 0) end = 0;
 216     }
 217     newlen = (start > end) ? 0 : (end-start)+1;
 218     if (newlen != 0) {
 219         if (start >= (signed)len) start = len-1;
 220         if (end >= (signed)len) end = len-1;
 221         newlen = (start > end) ? 0 : (end-start)+1;
 222     } else {
 223         start = 0;
 224     }
 225     if (start != 0) memmove(sh->buf, sh->buf+start, newlen);
 226     sh->buf[newlen] = 0;
 227     sh->free = sh->free+(sh->len-newlen);
 228     sh->len = newlen;
 229     return s;
 230 }
 231
 232 void sdstolower(sds s) {
 233     int len = sdslen(s), j;
 234
 235     for (j = 0; j < len; j++) s[j] = tolower(s[j]);
 236 }
 237
 238 void sdstoupper(sds s) {
 239     int len = sdslen(s), j;
 240
 241     for (j = 0; j < len; j++) s[j] = toupper(s[j]);
 242 }
 243
 244 int sdscmp(sds s1, sds s2) {
 245     size_t l1, l2, minlen;
 246     int cmp;
 247
 248     l1 = sdslen(s1);
 249     l2 = sdslen(s2);
 250     minlen = (l1 < l2) ? l1 : l2;
 251     cmp = memcmp(s1,s2,minlen);
 252     if (cmp == 0) return l1-l2;
 253     return cmp;
 254 }
 255
 256 /* Split 's' with separator in 'sep'. An array
 257  * of sds strings is returned. *count will be set
 258  * by reference to the number of tokens returned.
 259  *
 260  * On out of memory, zero length string, zero length
 261  * separator, NULL is returned.
 262  *
 263  * Note that 'sep' is able to split a string using
 264  * a multi-character separator. For example
 265  * sdssplit("foo_-_bar","_-_"); will return two
 266  * elements "foo" and "bar".
 267  *
 268  * This version of the function is binary-safe but
 269  * requires length arguments. sdssplit() is just the
 270  * same function but for zero-terminated strings.
 271  */
 272 sds *sdssplitlen(char *s, int len, char *sep, int seplen, int *count) {
 273     int elements = 0, slots = 5, start = 0, j;
 274
 275     sds *tokens = zmalloc(sizeof(sds)*slots);
 276 #ifdef SDS_ABORT_ON_OOM
 277     if (tokens == NULL) sdsOomAbort();
 278 #endif
 279     if (seplen < 1 || len < 0 || tokens == NULL) return NULL;
 280     for (j = 0; j < (len-(seplen-1)); j++) {
 281         /* make sure there is room for the next element and the final one */
 282         if (slots < elements+2) {
 283             sds *newtokens;
 284
 285             slots *= 2;
 286             newtokens = zrealloc(tokens,sizeof(sds)*slots);
 287             if (newtokens == NULL) {
 288 #ifdef SDS_ABORT_ON_OOM
 289                 sdsOomAbort();
 290 #else
 291                 goto cleanup;
 292 #endif
 293             }
 294             tokens = newtokens;
 295         }
 296         /* search the separator */
 297         if ((seplen == 1 && *(s+j) == sep[0]) || (memcmp(s+j,sep,seplen) == 0)) {
 298             tokens[elements] = sdsnewlen(s+start,j-start);
 299             if (tokens[elements] == NULL) {
 300 #ifdef SDS_ABORT_ON_OOM
 301                 sdsOomAbort();
 302 #else
 303                 goto cleanup;
 304 #endif
 305             }
 306             elements++;
 307             start = j+seplen;
 308             j = j+seplen-1; /* skip the separator */
 309         }
 310     }
 311     /* Add the final element. We are sure there is room in the tokens array. */
 312     tokens[elements] = sdsnewlen(s+start,len-start);
 313     if (tokens[elements] == NULL) {
 314 #ifdef SDS_ABORT_ON_OOM
 315                 sdsOomAbort();
 316 #else
 317                 goto cleanup;
 318 #endif
 319     }
 320     elements++;
 321     *count = elements;
 322     return tokens;
 323
 324 #ifndef SDS_ABORT_ON_OOM
 325 cleanup:
 326     {
 327         int i;
 328         for (i = 0; i < elements; i++) sdsfree(tokens[i]);
 329         zfree(tokens);
 330         return NULL;
 331     }
 332 #endif
 333 }