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