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-/* SDSLib 2.0 -- A C dynamic strings library
- *
- * Copyright (c) 2006-2015, Salvatore Sanfilippo <antirez at gmail dot com>
- * Copyright (c) 2015, Oran Agra
- * Copyright (c) 2015, Redis Labs, Inc
- * 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.
- */
-
-#ifndef __SDS_H
-#define __SDS_H
-
-#define SDS_MAX_PREALLOC (1024*1024)
-
-#include <sys/types.h>
-#include <stdarg.h>
-#include <stdint.h>
-
-typedef char *sds;
-
-/* Note: sdshdr5 is never used, we just access the flags byte directly.
- * However is here to document the layout of type 5 SDS strings. */
-struct __attribute__ ((__packed__)) sdshdr5 {
- unsigned char flags; /* 3 lsb of type, and 5 msb of string length */
- char buf[];
-};
-struct __attribute__ ((__packed__)) sdshdr8 {
- uint8_t len; /* used */
- uint8_t alloc; /* excluding the header and null terminator */
- unsigned char flags; /* 3 lsb of type, 5 unused bits */
- char buf[];
-};
-struct __attribute__ ((__packed__)) sdshdr16 {
- uint16_t len; /* used */
- uint16_t alloc; /* excluding the header and null terminator */
- unsigned char flags; /* 3 lsb of type, 5 unused bits */
- char buf[];
-};
-struct __attribute__ ((__packed__)) sdshdr32 {
- uint32_t len; /* used */
- uint32_t alloc; /* excluding the header and null terminator */
- unsigned char flags; /* 3 lsb of type, 5 unused bits */
- char buf[];
-};
-struct __attribute__ ((__packed__)) sdshdr64 {
- uint64_t len; /* used */
- uint64_t alloc; /* excluding the header and null terminator */
- unsigned char flags; /* 3 lsb of type, 5 unused bits */
- char buf[];
-};
-
-#define SDS_TYPE_5 0
-#define SDS_TYPE_8 1
-#define SDS_TYPE_16 2
-#define SDS_TYPE_32 3
-#define SDS_TYPE_64 4
-#define SDS_TYPE_MASK 7
-#define SDS_TYPE_BITS 3
-#define SDS_HDR_VAR(T,s) struct sdshdr##T *sh = (void*)((s)-(sizeof(struct sdshdr##T)));
-#define SDS_HDR(T,s) ((struct sdshdr##T *)((s)-(sizeof(struct sdshdr##T))))
-#define SDS_TYPE_5_LEN(f) ((f)>>SDS_TYPE_BITS)
-
-static inline size_t sdslen(const sds s) {
- unsigned char flags = s[-1];
- switch(flags&SDS_TYPE_MASK) {
- case SDS_TYPE_5:
- return SDS_TYPE_5_LEN(flags);
- case SDS_TYPE_8:
- return SDS_HDR(8,s)->len;
- case SDS_TYPE_16:
- return SDS_HDR(16,s)->len;
- case SDS_TYPE_32:
- return SDS_HDR(32,s)->len;
- case SDS_TYPE_64:
- return SDS_HDR(64,s)->len;
- }
- return 0;
-}
-
-static inline size_t sdsavail(const sds s) {
- unsigned char flags = s[-1];
- switch(flags&SDS_TYPE_MASK) {
- case SDS_TYPE_5: {
- return 0;
- }
- case SDS_TYPE_8: {
- SDS_HDR_VAR(8,s);
- return sh->alloc - sh->len;
- }
- case SDS_TYPE_16: {
- SDS_HDR_VAR(16,s);
- return sh->alloc - sh->len;
- }
- case SDS_TYPE_32: {
- SDS_HDR_VAR(32,s);
- return sh->alloc - sh->len;
- }
- case SDS_TYPE_64: {
- SDS_HDR_VAR(64,s);
- return sh->alloc - sh->len;
- }
- }
- return 0;
-}
-
-static inline void sdssetlen(sds s, size_t newlen) {
- unsigned char flags = s[-1];
- switch(flags&SDS_TYPE_MASK) {
- case SDS_TYPE_5:
- {
- unsigned char *fp = ((unsigned char*)s)-1;
- *fp = SDS_TYPE_5 | (newlen << SDS_TYPE_BITS);
- }
- break;
- case SDS_TYPE_8:
- SDS_HDR(8,s)->len = newlen;
- break;
- case SDS_TYPE_16:
- SDS_HDR(16,s)->len = newlen;
- break;
- case SDS_TYPE_32:
- SDS_HDR(32,s)->len = newlen;
- break;
- case SDS_TYPE_64:
- SDS_HDR(64,s)->len = newlen;
- break;
- }
-}
-
-static inline void sdsinclen(sds s, size_t inc) {
- unsigned char flags = s[-1];
- switch(flags&SDS_TYPE_MASK) {
- case SDS_TYPE_5:
- {
- unsigned char *fp = ((unsigned char*)s)-1;
- unsigned char newlen = SDS_TYPE_5_LEN(flags)+inc;
- *fp = SDS_TYPE_5 | (newlen << SDS_TYPE_BITS);
- }
- break;
- case SDS_TYPE_8:
- SDS_HDR(8,s)->len += inc;
- break;
- case SDS_TYPE_16:
- SDS_HDR(16,s)->len += inc;
- break;
- case SDS_TYPE_32:
- SDS_HDR(32,s)->len += inc;
- break;
- case SDS_TYPE_64:
- SDS_HDR(64,s)->len += inc;
- break;
- }
-}
-
-/* sdsalloc() = sdsavail() + sdslen() */
-static inline size_t sdsalloc(const sds s) {
- unsigned char flags = s[-1];
- switch(flags&SDS_TYPE_MASK) {
- case SDS_TYPE_5:
- return SDS_TYPE_5_LEN(flags);
- case SDS_TYPE_8:
- return SDS_HDR(8,s)->alloc;
- case SDS_TYPE_16:
- return SDS_HDR(16,s)->alloc;
- case SDS_TYPE_32:
- return SDS_HDR(32,s)->alloc;
- case SDS_TYPE_64:
- return SDS_HDR(64,s)->alloc;
- }
- return 0;
-}
-
-static inline void sdssetalloc(sds s, size_t newlen) {
- unsigned char flags = s[-1];
- switch(flags&SDS_TYPE_MASK) {
- case SDS_TYPE_5:
- /* Nothing to do, this type has no total allocation info. */
- break;
- case SDS_TYPE_8:
- SDS_HDR(8,s)->alloc = newlen;
- break;
- case SDS_TYPE_16:
- SDS_HDR(16,s)->alloc = newlen;
- break;
- case SDS_TYPE_32:
- SDS_HDR(32,s)->alloc = newlen;
- break;
- case SDS_TYPE_64:
- SDS_HDR(64,s)->alloc = newlen;
- break;
- }
-}
-
-sds sdsnewlen(const void *init, size_t initlen);
-sds sdsnew(const char *init);
-sds sdsempty(void);
-sds sdsdup(const sds s);
-void sdsfree(sds s);
-sds sdsgrowzero(sds s, size_t len);
-sds sdscatlen(sds s, const void *t, size_t len);
-sds sdscat(sds s, const char *t);
-sds sdscatsds(sds s, const sds t);
-sds sdscpylen(sds s, const char *t, size_t len);
-sds sdscpy(sds s, const char *t);
-
-sds sdscatvprintf(sds s, const char *fmt, va_list ap);
-#ifdef __GNUC__
-sds sdscatprintf(sds s, const char *fmt, ...)
- __attribute__((format(printf, 2, 3)));
-#else
-sds sdscatprintf(sds s, const char *fmt, ...);
-#endif
-
-sds sdscatfmt(sds s, char const *fmt, ...);
-sds sdstrim(sds s, const char *cset);
-void sdsrange(sds s, int start, int end);
-void sdsupdatelen(sds s);
-void sdsclear(sds s);
-int sdscmp(const sds s1, const sds s2);
-sds *sdssplitlen(const char *s, int len, const char *sep, int seplen, int *count);
-void sdsfreesplitres(sds *tokens, int count);
-void sdstolower(sds s);
-void sdstoupper(sds s);
-sds sdsfromlonglong(long long value);
-sds sdscatrepr(sds s, const char *p, size_t len);
-sds *sdssplitargs(const char *line, int *argc);
-sds sdsmapchars(sds s, const char *from, const char *to, size_t setlen);
-sds sdsjoin(char **argv, int argc, char *sep);
-sds sdsjoinsds(sds *argv, int argc, const char *sep, size_t seplen);
-
-/* Low level functions exposed to the user API */
-sds sdsMakeRoomFor(sds s, size_t addlen);
-void sdsIncrLen(sds s, int incr);
-sds sdsRemoveFreeSpace(sds s);
-size_t sdsAllocSize(sds s);
-void *sdsAllocPtr(sds s);
-
-/* Export the allocator used by SDS to the program using SDS.
- * Sometimes the program SDS is linked to, may use a different set of
- * allocators, but may want to allocate or free things that SDS will
- * respectively free or allocate. */
-void *sds_malloc(size_t size);
-void *sds_realloc(void *ptr, size_t size);
-void sds_free(void *ptr);
-
-#ifdef REDIS_TEST
-int sdsTest(int argc, char *argv[]);
-#endif
-
-#endif
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