[redis.git] / sds.c

/* SDSLib, A C dynamic strings library
 *
 * Copyright (c) 2006-2009, 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-totlen);
        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 = 32;

    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, long start, long 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;
    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
}
Commit	Line	Data
ed9b544e	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
56906eef	31	#define SDS_ABORT_ON_OOM
56906eef	32
ed9b544e	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
f1017b3f	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;
ed9b544e	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)));
f1017b3f	76	return sh->len;
ed9b544e	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;
f1017b3f	85	zfree(s-sizeof(struct sdshdr));
ed9b544e	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);
f1017b3f	96	sh->free += (sh->len-reallen);
f1017b3f	97	sh->len = reallen;
ed9b544e	98	}
	99
	100	static sds sdsMakeRoomFor(sds s, size_t addlen) {
	101	struct sdshdr sh, newsh;
	102	size_t free = sdsavail(s);
f1017b3f	103	size_t len, newlen;
ed9b544e	104
f1017b3f	105	if (free >= addlen) return s;
ed9b544e	106	len = sdslen(s);
ed9b544e	107	sh = (void*) (s-(sizeof(struct sdshdr)));
f1017b3f	108	newlen = (len+addlen)*2;
f1017b3f	109	newsh = zrealloc(sh, sizeof(struct sdshdr)+newlen+1);
ed9b544e	110	#ifdef SDS_ABORT_ON_OOM
f1017b3f	111	if (newsh == NULL) sdsOomAbort();
ed9b544e	112	#else
f1017b3f	113	if (newsh == NULL) return NULL;
ed9b544e	114	#endif
f1017b3f	115
f1017b3f	116	newsh->free = newlen - len;
ed9b544e	117	return newsh->buf;
	118	}
	119
	120	sds sdscatlen(sds s, void *t, size_t len) {
f1017b3f	121	struct sdshdr *sh;
ed9b544e	122	size_t curlen = sdslen(s);
	123
	124	s = sdsMakeRoomFor(s,len);
	125	if (s == NULL) return NULL;
f1017b3f	126	sh = (void*) (s-(sizeof(struct sdshdr)));
ed9b544e	127	memcpy(s+curlen, t, len);
f1017b3f	128	sh->len = curlen+len;
f1017b3f	129	sh->free = sh->free-len;
ed9b544e	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)));
f1017b3f	140	size_t totlen = sh->free+sh->len;
ed9b544e	141
	142	if (totlen < len) {
	143	s = sdsMakeRoomFor(s,len-totlen);
	144	if (s == NULL) return NULL;
f1017b3f	145	sh = (void*) (s-(sizeof(struct sdshdr)));
f1017b3f	146	totlen = sh->free+sh->len;
ed9b544e	147	}
	148	memcpy(s, t, len);
	149	s[len] = '\0';
f1017b3f	150	sh->len = len;
f1017b3f	151	sh->free = totlen-len;
ed9b544e	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';
f1017b3f	199	sh->free = sh->free+(sh->len-len);
f1017b3f	200	sh->len = len;
ed9b544e	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;
f1017b3f	227	sh->free = sh->free+(sh->len-newlen);
f1017b3f	228	sh->len = newlen;
ed9b544e	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) {
a4d1ba9a	283	sds *newtokens;
a4d1ba9a	284
ed9b544e	285	slots *= 2;
a4d1ba9a	286	newtokens = zrealloc(tokens,sizeof(sds)*slots);
ed9b544e	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	}