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-rw-r--r--src/sds.c384
1 files changed, 384 insertions, 0 deletions
diff --git a/src/sds.c b/src/sds.c
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+++ b/src/sds.c
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+/* SDSLib, A C dynamic strings library
+ *
+ * Copyright (c) 2006-2010, Salvatore Sanfilippo <antirez at gmail dot com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * * Neither the name of Redis nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#define SDS_ABORT_ON_OOM
+
+#include "sds.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <ctype.h>
+#include "zmalloc.h"
+
+static void sdsOomAbort(void) {
+ fprintf(stderr,"SDS: Out Of Memory (SDS_ABORT_ON_OOM defined)\n");
+ abort();
+}
+
+sds sdsnewlen(const void *init, size_t initlen) {
+ struct sdshdr *sh;
+
+ sh = zmalloc(sizeof(struct sdshdr)+initlen+1);
+#ifdef SDS_ABORT_ON_OOM
+ if (sh == NULL) sdsOomAbort();
+#else
+ if (sh == NULL) return NULL;
+#endif
+ sh->len = initlen;
+ sh->free = 0;
+ if (initlen) {
+ if (init) memcpy(sh->buf, init, initlen);
+ else memset(sh->buf,0,initlen);
+ }
+ sh->buf[initlen] = '\0';
+ return (char*)sh->buf;
+}
+
+sds sdsempty(void) {
+ return sdsnewlen("",0);
+}
+
+sds sdsnew(const char *init) {
+ size_t initlen = (init == NULL) ? 0 : strlen(init);
+ return sdsnewlen(init, initlen);
+}
+
+size_t sdslen(const sds s) {
+ struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+ return sh->len;
+}
+
+sds sdsdup(const sds s) {
+ return sdsnewlen(s, sdslen(s));
+}
+
+void sdsfree(sds s) {
+ if (s == NULL) return;
+ zfree(s-sizeof(struct sdshdr));
+}
+
+size_t sdsavail(sds s) {
+ struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+ return sh->free;
+}
+
+void sdsupdatelen(sds s) {
+ struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+ int reallen = strlen(s);
+ sh->free += (sh->len-reallen);
+ sh->len = reallen;
+}
+
+static sds sdsMakeRoomFor(sds s, size_t addlen) {
+ struct sdshdr *sh, *newsh;
+ size_t free = sdsavail(s);
+ size_t len, newlen;
+
+ if (free >= addlen) return s;
+ len = sdslen(s);
+ sh = (void*) (s-(sizeof(struct sdshdr)));
+ newlen = (len+addlen)*2;
+ newsh = zrealloc(sh, sizeof(struct sdshdr)+newlen+1);
+#ifdef SDS_ABORT_ON_OOM
+ if (newsh == NULL) sdsOomAbort();
+#else
+ if (newsh == NULL) return NULL;
+#endif
+
+ newsh->free = newlen - len;
+ return newsh->buf;
+}
+
+sds sdscatlen(sds s, void *t, size_t len) {
+ struct sdshdr *sh;
+ size_t curlen = sdslen(s);
+
+ s = sdsMakeRoomFor(s,len);
+ if (s == NULL) return NULL;
+ sh = (void*) (s-(sizeof(struct sdshdr)));
+ memcpy(s+curlen, t, len);
+ sh->len = curlen+len;
+ sh->free = sh->free-len;
+ s[curlen+len] = '\0';
+ return s;
+}
+
+sds sdscat(sds s, char *t) {
+ return sdscatlen(s, t, strlen(t));
+}
+
+sds sdscpylen(sds s, char *t, size_t len) {
+ struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+ size_t totlen = sh->free+sh->len;
+
+ if (totlen < len) {
+ s = sdsMakeRoomFor(s,len-sh->len);
+ if (s == NULL) return NULL;
+ sh = (void*) (s-(sizeof(struct sdshdr)));
+ totlen = sh->free+sh->len;
+ }
+ memcpy(s, t, len);
+ s[len] = '\0';
+ sh->len = len;
+ sh->free = totlen-len;
+ return s;
+}
+
+sds sdscpy(sds s, char *t) {
+ return sdscpylen(s, t, strlen(t));
+}
+
+sds sdscatprintf(sds s, const char *fmt, ...) {
+ va_list ap;
+ char *buf, *t;
+ size_t buflen = 16;
+
+ while(1) {
+ buf = zmalloc(buflen);
+#ifdef SDS_ABORT_ON_OOM
+ if (buf == NULL) sdsOomAbort();
+#else
+ if (buf == NULL) return NULL;
+#endif
+ buf[buflen-2] = '\0';
+ va_start(ap, fmt);
+ vsnprintf(buf, buflen, fmt, ap);
+ va_end(ap);
+ if (buf[buflen-2] != '\0') {
+ zfree(buf);
+ buflen *= 2;
+ continue;
+ }
+ break;
+ }
+ t = sdscat(s, buf);
+ zfree(buf);
+ return t;
+}
+
+sds sdstrim(sds s, const char *cset) {
+ struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+ char *start, *end, *sp, *ep;
+ size_t len;
+
+ sp = start = s;
+ ep = end = s+sdslen(s)-1;
+ while(sp <= end && strchr(cset, *sp)) sp++;
+ while(ep > start && strchr(cset, *ep)) ep--;
+ len = (sp > ep) ? 0 : ((ep-sp)+1);
+ if (sh->buf != sp) memmove(sh->buf, sp, len);
+ sh->buf[len] = '\0';
+ sh->free = sh->free+(sh->len-len);
+ sh->len = len;
+ return s;
+}
+
+sds sdsrange(sds s, int start, int end) {
+ struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+ size_t newlen, len = sdslen(s);
+
+ if (len == 0) return s;
+ if (start < 0) {
+ start = len+start;
+ if (start < 0) start = 0;
+ }
+ if (end < 0) {
+ end = len+end;
+ if (end < 0) end = 0;
+ }
+ newlen = (start > end) ? 0 : (end-start)+1;
+ if (newlen != 0) {
+ if (start >= (signed)len) start = len-1;
+ if (end >= (signed)len) end = len-1;
+ newlen = (start > end) ? 0 : (end-start)+1;
+ } else {
+ start = 0;
+ }
+ if (start != 0) memmove(sh->buf, sh->buf+start, newlen);
+ sh->buf[newlen] = 0;
+ sh->free = sh->free+(sh->len-newlen);
+ sh->len = newlen;
+ return s;
+}
+
+void sdstolower(sds s) {
+ int len = sdslen(s), j;
+
+ for (j = 0; j < len; j++) s[j] = tolower(s[j]);
+}
+
+void sdstoupper(sds s) {
+ int len = sdslen(s), j;
+
+ for (j = 0; j < len; j++) s[j] = toupper(s[j]);
+}
+
+int sdscmp(sds s1, sds s2) {
+ size_t l1, l2, minlen;
+ int cmp;
+
+ l1 = sdslen(s1);
+ l2 = sdslen(s2);
+ minlen = (l1 < l2) ? l1 : l2;
+ cmp = memcmp(s1,s2,minlen);
+ if (cmp == 0) return l1-l2;
+ return cmp;
+}
+
+/* Split 's' with separator in 'sep'. An array
+ * of sds strings is returned. *count will be set
+ * by reference to the number of tokens returned.
+ *
+ * On out of memory, zero length string, zero length
+ * separator, NULL is returned.
+ *
+ * Note that 'sep' is able to split a string using
+ * a multi-character separator. For example
+ * sdssplit("foo_-_bar","_-_"); will return two
+ * elements "foo" and "bar".
+ *
+ * This version of the function is binary-safe but
+ * requires length arguments. sdssplit() is just the
+ * same function but for zero-terminated strings.
+ */
+sds *sdssplitlen(char *s, int len, char *sep, int seplen, int *count) {
+ int elements = 0, slots = 5, start = 0, j;
+
+ sds *tokens = zmalloc(sizeof(sds)*slots);
+#ifdef SDS_ABORT_ON_OOM
+ if (tokens == NULL) sdsOomAbort();
+#endif
+ if (seplen < 1 || len < 0 || tokens == NULL) return NULL;
+ if (len == 0) {
+ *count = 0;
+ return tokens;
+ }
+ for (j = 0; j < (len-(seplen-1)); j++) {
+ /* make sure there is room for the next element and the final one */
+ if (slots < elements+2) {
+ sds *newtokens;
+
+ slots *= 2;
+ newtokens = zrealloc(tokens,sizeof(sds)*slots);
+ if (newtokens == NULL) {
+#ifdef SDS_ABORT_ON_OOM
+ sdsOomAbort();
+#else
+ goto cleanup;
+#endif
+ }
+ tokens = newtokens;
+ }
+ /* search the separator */
+ if ((seplen == 1 && *(s+j) == sep[0]) || (memcmp(s+j,sep,seplen) == 0)) {
+ tokens[elements] = sdsnewlen(s+start,j-start);
+ if (tokens[elements] == NULL) {
+#ifdef SDS_ABORT_ON_OOM
+ sdsOomAbort();
+#else
+ goto cleanup;
+#endif
+ }
+ elements++;
+ start = j+seplen;
+ j = j+seplen-1; /* skip the separator */
+ }
+ }
+ /* Add the final element. We are sure there is room in the tokens array. */
+ tokens[elements] = sdsnewlen(s+start,len-start);
+ if (tokens[elements] == NULL) {
+#ifdef SDS_ABORT_ON_OOM
+ sdsOomAbort();
+#else
+ goto cleanup;
+#endif
+ }
+ elements++;
+ *count = elements;
+ return tokens;
+
+#ifndef SDS_ABORT_ON_OOM
+cleanup:
+ {
+ int i;
+ for (i = 0; i < elements; i++) sdsfree(tokens[i]);
+ zfree(tokens);
+ return NULL;
+ }
+#endif
+}
+
+void sdsfreesplitres(sds *tokens, int count) {
+ if (!tokens) return;
+ while(count--)
+ sdsfree(tokens[count]);
+ zfree(tokens);
+}
+
+sds sdsfromlonglong(long long value) {
+ char buf[32], *p;
+ unsigned long long v;
+
+ v = (value < 0) ? -value : value;
+ p = buf+31; /* point to the last character */
+ do {
+ *p-- = '0'+(v%10);
+ v /= 10;
+ } while(v);
+ if (value < 0) *p-- = '-';
+ p++;
+ return sdsnewlen(p,32-(p-buf));
+}
+
+sds sdscatrepr(sds s, char *p, size_t len) {
+ s = sdscatlen(s,"\"",1);
+ while(len--) {
+ switch(*p) {
+ case '\\':
+ case '"':
+ s = sdscatprintf(s,"\\%c",*p);
+ break;
+ case '\n': s = sdscatlen(s,"\\n",1); break;
+ case '\r': s = sdscatlen(s,"\\r",1); break;
+ case '\t': s = sdscatlen(s,"\\t",1); break;
+ case '\a': s = sdscatlen(s,"\\a",1); break;
+ case '\b': s = sdscatlen(s,"\\b",1); break;
+ default:
+ if (isprint(*p))
+ s = sdscatprintf(s,"%c",*p);
+ else
+ s = sdscatprintf(s,"\\x%02x",(unsigned char)*p);
+ break;
+ }
+ p++;
+ }
+ return sdscatlen(s,"\"",1);
+}
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