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valkey/deps/hiredis/sds.h

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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 HIREDIS_SDS_H
#define HIREDIS_SDS_H
#define HI_SDS_MAX_PREALLOC (1024*1024)
#ifdef _MSC_VER
#define __attribute__(x)
typedef long long ssize_t;
#define SSIZE_MAX (LLONG_MAX >> 1)
#endif
#include <sys/types.h>
#include <stdarg.h>
#include <stdint.h>
typedef char *hisds;
/* 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__)) hisdshdr5 {
unsigned char flags; /* 3 lsb of type, and 5 msb of string length */
char buf[];
};
struct __attribute__ ((__packed__)) hisdshdr8 {
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__)) hisdshdr16 {
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__)) hisdshdr32 {
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__)) hisdshdr64 {
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 HI_SDS_TYPE_5 0
#define HI_SDS_TYPE_8 1
#define HI_SDS_TYPE_16 2
#define HI_SDS_TYPE_32 3
#define HI_SDS_TYPE_64 4
#define HI_SDS_TYPE_MASK 7
#define HI_SDS_TYPE_BITS 3
#define HI_SDS_HDR_VAR(T,s) struct hisdshdr##T *sh = (struct hisdshdr##T *)((s)-(sizeof(struct hisdshdr##T)));
#define HI_SDS_HDR(T,s) ((struct hisdshdr##T *)((s)-(sizeof(struct hisdshdr##T))))
#define HI_SDS_TYPE_5_LEN(f) ((f)>>HI_SDS_TYPE_BITS)
static inline size_t hi_sdslen(const hisds s) {
unsigned char flags = s[-1];
switch(flags & HI_SDS_TYPE_MASK) {
case HI_SDS_TYPE_5:
return HI_SDS_TYPE_5_LEN(flags);
case HI_SDS_TYPE_8:
return HI_SDS_HDR(8,s)->len;
case HI_SDS_TYPE_16:
return HI_SDS_HDR(16,s)->len;
case HI_SDS_TYPE_32:
return HI_SDS_HDR(32,s)->len;
case HI_SDS_TYPE_64:
return HI_SDS_HDR(64,s)->len;
}
return 0;
}
static inline size_t hi_sdsavail(const hisds s) {
unsigned char flags = s[-1];
switch(flags&HI_SDS_TYPE_MASK) {
case HI_SDS_TYPE_5: {
return 0;
}
case HI_SDS_TYPE_8: {
HI_SDS_HDR_VAR(8,s);
return sh->alloc - sh->len;
}
case HI_SDS_TYPE_16: {
HI_SDS_HDR_VAR(16,s);
return sh->alloc - sh->len;
}
case HI_SDS_TYPE_32: {
HI_SDS_HDR_VAR(32,s);
return sh->alloc - sh->len;
}
case HI_SDS_TYPE_64: {
HI_SDS_HDR_VAR(64,s);
return sh->alloc - sh->len;
}
}
return 0;
}
static inline void hi_sdssetlen(hisds s, size_t newlen) {
unsigned char flags = s[-1];
switch(flags&HI_SDS_TYPE_MASK) {
case HI_SDS_TYPE_5:
{
unsigned char *fp = ((unsigned char*)s)-1;
*fp = (unsigned char)(HI_SDS_TYPE_5 | (newlen << HI_SDS_TYPE_BITS));
}
break;
case HI_SDS_TYPE_8:
HI_SDS_HDR(8,s)->len = (uint8_t)newlen;
break;
case HI_SDS_TYPE_16:
HI_SDS_HDR(16,s)->len = (uint16_t)newlen;
break;
case HI_SDS_TYPE_32:
HI_SDS_HDR(32,s)->len = (uint32_t)newlen;
break;
case HI_SDS_TYPE_64:
HI_SDS_HDR(64,s)->len = (uint64_t)newlen;
break;
}
}
static inline void hi_sdsinclen(hisds s, size_t inc) {
unsigned char flags = s[-1];
switch(flags&HI_SDS_TYPE_MASK) {
case HI_SDS_TYPE_5:
{
unsigned char *fp = ((unsigned char*)s)-1;
unsigned char newlen = HI_SDS_TYPE_5_LEN(flags)+(unsigned char)inc;
*fp = HI_SDS_TYPE_5 | (newlen << HI_SDS_TYPE_BITS);
}
break;
case HI_SDS_TYPE_8:
HI_SDS_HDR(8,s)->len += (uint8_t)inc;
break;
case HI_SDS_TYPE_16:
HI_SDS_HDR(16,s)->len += (uint16_t)inc;
break;
case HI_SDS_TYPE_32:
HI_SDS_HDR(32,s)->len += (uint32_t)inc;
break;
case HI_SDS_TYPE_64:
HI_SDS_HDR(64,s)->len += (uint64_t)inc;
break;
}
}
/* hi_sdsalloc() = hi_sdsavail() + hi_sdslen() */
static inline size_t hi_sdsalloc(const hisds s) {
unsigned char flags = s[-1];
switch(flags & HI_SDS_TYPE_MASK) {
case HI_SDS_TYPE_5:
return HI_SDS_TYPE_5_LEN(flags);
case HI_SDS_TYPE_8:
return HI_SDS_HDR(8,s)->alloc;
case HI_SDS_TYPE_16:
return HI_SDS_HDR(16,s)->alloc;
case HI_SDS_TYPE_32:
return HI_SDS_HDR(32,s)->alloc;
case HI_SDS_TYPE_64:
return HI_SDS_HDR(64,s)->alloc;
}
return 0;
}
static inline void hi_sdssetalloc(hisds s, size_t newlen) {
unsigned char flags = s[-1];
switch(flags&HI_SDS_TYPE_MASK) {
case HI_SDS_TYPE_5:
/* Nothing to do, this type has no total allocation info. */
break;
case HI_SDS_TYPE_8:
HI_SDS_HDR(8,s)->alloc = (uint8_t)newlen;
break;
case HI_SDS_TYPE_16:
HI_SDS_HDR(16,s)->alloc = (uint16_t)newlen;
break;
case HI_SDS_TYPE_32:
HI_SDS_HDR(32,s)->alloc = (uint32_t)newlen;
break;
case HI_SDS_TYPE_64:
HI_SDS_HDR(64,s)->alloc = (uint64_t)newlen;
break;
}
}
hisds hi_sdsnewlen(const void *init, size_t initlen);
hisds hi_sdsnew(const char *init);
hisds hi_sdsempty(void);
hisds hi_sdsdup(const hisds s);
void hi_sdsfree(hisds s);
hisds hi_sdsgrowzero(hisds s, size_t len);
hisds hi_sdscatlen(hisds s, const void *t, size_t len);
hisds hi_sdscat(hisds s, const char *t);
hisds hi_sdscatsds(hisds s, const hisds t);
hisds hi_sdscpylen(hisds s, const char *t, size_t len);
hisds hi_sdscpy(hisds s, const char *t);
hisds hi_sdscatvprintf(hisds s, const char *fmt, va_list ap);
#ifdef __GNUC__
hisds hi_sdscatprintf(hisds s, const char *fmt, ...)
__attribute__((format(printf, 2, 3)));
#else
hisds hi_sdscatprintf(hisds s, const char *fmt, ...);
#endif
hisds hi_sdscatfmt(hisds s, char const *fmt, ...);
hisds hi_sdstrim(hisds s, const char *cset);
int hi_sdsrange(hisds s, ssize_t start, ssize_t end);
void hi_sdsupdatelen(hisds s);
void hi_sdsclear(hisds s);
int hi_sdscmp(const hisds s1, const hisds s2);
hisds *hi_sdssplitlen(const char *s, int len, const char *sep, int seplen, int *count);
void hi_sdsfreesplitres(hisds *tokens, int count);
void hi_sdstolower(hisds s);
void hi_sdstoupper(hisds s);
hisds hi_sdsfromlonglong(long long value);
hisds hi_sdscatrepr(hisds s, const char *p, size_t len);
hisds *hi_sdssplitargs(const char *line, int *argc);
hisds hi_sdsmapchars(hisds s, const char *from, const char *to, size_t setlen);
hisds hi_sdsjoin(char **argv, int argc, char *sep);
hisds hi_sdsjoinsds(hisds *argv, int argc, const char *sep, size_t seplen);
/* Low level functions exposed to the user API */
hisds hi_sdsMakeRoomFor(hisds s, size_t addlen);
void hi_sdsIncrLen(hisds s, int incr);
hisds hi_sdsRemoveFreeSpace(hisds s);
size_t hi_sdsAllocSize(hisds s);
void *hi_sdsAllocPtr(hisds 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 *hi_sds_malloc(size_t size);
void *hi_sds_realloc(void *ptr, size_t size);
void hi_sds_free(void *ptr);
#ifdef REDIS_TEST
int hi_sdsTest(int argc, char *argv[]);
#endif
#endif /* HIREDIS_SDS_H */
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