[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.
 */

#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
	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) {
a4d1ba9a	281	sds *newtokens;
a4d1ba9a	282
ed9b544e	283	slots *= 2;
a4d1ba9a	284	newtokens = zrealloc(tokens,sizeof(sds)*slots);
ed9b544e	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	}