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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)
+extern const char *SDS_NOINIT;
+
+#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 sdstrynewlen(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 sdssubstr(sds s, size_t start, size_t len);
+void sdsrange(sds s, ssize_t start, ssize_t end);
+void sdsupdatelen(sds s);
+void sdsclear(sds s);
+int sdscmp(const sds s1, const sds s2);
+sds *sdssplitlen(const char *s, ssize_t 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);
+int sdsneedsrepr(const sds s);
+
+/* Callback for sdstemplate. The function gets called by sdstemplate
+ * every time a variable needs to be expanded. The variable name is
+ * provided as variable, and the callback is expected to return a
+ * substitution value. Returning a NULL indicates an error.
+ */
+typedef sds (*sdstemplate_callback_t)(const sds variable, void *arg);
+sds sdstemplate(const char *template, sdstemplate_callback_t cb_func, void *cb_arg);
+
+/* Low level functions exposed to the user API */
+sds sdsMakeRoomFor(sds s, size_t addlen);
+sds sdsMakeRoomForNonGreedy(sds s, size_t addlen);
+void sdsIncrLen(sds s, ssize_t incr);
+sds sdsRemoveFreeSpace(sds s, int would_regrow);
+sds sdsResize(sds s, size_t size, int would_regrow);
+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[], int flags);
+#endif
+
+#endif
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