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Diffstat (limited to 'src/sds.c')
| -rw-r--r-- | src/sds.c | 1571 |
1 files changed, 1571 insertions, 0 deletions
diff --git a/src/sds.c b/src/sds.c new file mode 100644 index 0000000..71490d5 --- /dev/null +++ b/src/sds.c @@ -0,0 +1,1571 @@ +/* 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. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <ctype.h> +#include <assert.h> +#include <limits.h> +#include "sds.h" +#include "sdsalloc.h" + +const char *SDS_NOINIT = "SDS_NOINIT"; + +static inline int sdsHdrSize(char type) { + switch(type&SDS_TYPE_MASK) { + case SDS_TYPE_5: + return sizeof(struct sdshdr5); + case SDS_TYPE_8: + return sizeof(struct sdshdr8); + case SDS_TYPE_16: + return sizeof(struct sdshdr16); + case SDS_TYPE_32: + return sizeof(struct sdshdr32); + case SDS_TYPE_64: + return sizeof(struct sdshdr64); + } + return 0; +} + +static inline char sdsReqType(size_t string_size) { + if (string_size < 1<<5) + return SDS_TYPE_5; + if (string_size < 1<<8) + return SDS_TYPE_8; + if (string_size < 1<<16) + return SDS_TYPE_16; +#if (LONG_MAX == LLONG_MAX) + if (string_size < 1ll<<32) + return SDS_TYPE_32; + return SDS_TYPE_64; +#else + return SDS_TYPE_32; +#endif +} + +static inline size_t sdsTypeMaxSize(char type) { + if (type == SDS_TYPE_5) + return (1<<5) - 1; + if (type == SDS_TYPE_8) + return (1<<8) - 1; + if (type == SDS_TYPE_16) + return (1<<16) - 1; +#if (LONG_MAX == LLONG_MAX) + if (type == SDS_TYPE_32) + return (1ll<<32) - 1; +#endif + return -1; /* this is equivalent to the max SDS_TYPE_64 or SDS_TYPE_32 */ +} + +/* Create a new sds string with the content specified by the 'init' pointer + * and 'initlen'. + * If NULL is used for 'init' the string is initialized with zero bytes. + * If SDS_NOINIT is used, the buffer is left uninitialized; + * + * The string is always null-terminated (all the sds strings are, always) so + * even if you create an sds string with: + * + * mystring = sdsnewlen("abc",3); + * + * You can print the string with printf() as there is an implicit \0 at the + * end of the string. However the string is binary safe and can contain + * \0 characters in the middle, as the length is stored in the sds header. */ +sds _sdsnewlen(const void *init, size_t initlen, int trymalloc) { + void *sh; + sds s; + char type = sdsReqType(initlen); + /* Empty strings are usually created in order to append. Use type 8 + * since type 5 is not good at this. */ + if (type == SDS_TYPE_5 && initlen == 0) type = SDS_TYPE_8; + int hdrlen = sdsHdrSize(type); + unsigned char *fp; /* flags pointer. */ + size_t usable; + + assert(initlen + hdrlen + 1 > initlen); /* Catch size_t overflow */ + sh = trymalloc? + s_trymalloc_usable(hdrlen+initlen+1, &usable) : + s_malloc_usable(hdrlen+initlen+1, &usable); + if (sh == NULL) return NULL; + if (init==SDS_NOINIT) + init = NULL; + else if (!init) + memset(sh, 0, hdrlen+initlen+1); + s = (char*)sh+hdrlen; + fp = ((unsigned char*)s)-1; + usable = usable-hdrlen-1; + if (usable > sdsTypeMaxSize(type)) + usable = sdsTypeMaxSize(type); + switch(type) { + case SDS_TYPE_5: { + *fp = type | (initlen << SDS_TYPE_BITS); + break; + } + case SDS_TYPE_8: { + SDS_HDR_VAR(8,s); + sh->len = initlen; + sh->alloc = usable; + *fp = type; + break; + } + case SDS_TYPE_16: { + SDS_HDR_VAR(16,s); + sh->len = initlen; + sh->alloc = usable; + *fp = type; + break; + } + case SDS_TYPE_32: { + SDS_HDR_VAR(32,s); + sh->len = initlen; + sh->alloc = usable; + *fp = type; + break; + } + case SDS_TYPE_64: { + SDS_HDR_VAR(64,s); + sh->len = initlen; + sh->alloc = usable; + *fp = type; + break; + } + } + if (initlen && init) + memcpy(s, init, initlen); + s[initlen] = '\0'; + return s; +} + +sds sdsnewlen(const void *init, size_t initlen) { + return _sdsnewlen(init, initlen, 0); +} + +sds sdstrynewlen(const void *init, size_t initlen) { + return _sdsnewlen(init, initlen, 1); +} + +/* Create an empty (zero length) sds string. Even in this case the string + * always has an implicit null term. */ +sds sdsempty(void) { + return sdsnewlen("",0); +} + +/* Create a new sds string starting from a null terminated C string. */ +sds sdsnew(const char *init) { + size_t initlen = (init == NULL) ? 0 : strlen(init); + return sdsnewlen(init, initlen); +} + +/* Duplicate an sds string. */ +sds sdsdup(const sds s) { + return sdsnewlen(s, sdslen(s)); +} + +/* Free an sds string. No operation is performed if 's' is NULL. */ +void sdsfree(sds s) { + if (s == NULL) return; + s_free((char*)s-sdsHdrSize(s[-1])); +} + +/* Set the sds string length to the length as obtained with strlen(), so + * considering as content only up to the first null term character. + * + * This function is useful when the sds string is hacked manually in some + * way, like in the following example: + * + * s = sdsnew("foobar"); + * s[2] = '\0'; + * sdsupdatelen(s); + * printf("%d\n", sdslen(s)); + * + * The output will be "2", but if we comment out the call to sdsupdatelen() + * the output will be "6" as the string was modified but the logical length + * remains 6 bytes. */ +void sdsupdatelen(sds s) { + size_t reallen = strlen(s); + sdssetlen(s, reallen); +} + +/* Modify an sds string in-place to make it empty (zero length). + * However all the existing buffer is not discarded but set as free space + * so that next append operations will not require allocations up to the + * number of bytes previously available. */ +void sdsclear(sds s) { + sdssetlen(s, 0); + s[0] = '\0'; +} + +/* Enlarge the free space at the end of the sds string so that the caller + * is sure that after calling this function can overwrite up to addlen + * bytes after the end of the string, plus one more byte for nul term. + * If there's already sufficient free space, this function returns without any + * action, if there isn't sufficient free space, it'll allocate what's missing, + * and possibly more: + * When greedy is 1, enlarge more than needed, to avoid need for future reallocs + * on incremental growth. + * When greedy is 0, enlarge just enough so that there's free space for 'addlen'. + * + * Note: this does not change the *length* of the sds string as returned + * by sdslen(), but only the free buffer space we have. */ +sds _sdsMakeRoomFor(sds s, size_t addlen, int greedy) { + void *sh, *newsh; + size_t avail = sdsavail(s); + size_t len, newlen, reqlen; + char type, oldtype = s[-1] & SDS_TYPE_MASK; + int hdrlen; + size_t usable; + + /* Return ASAP if there is enough space left. */ + if (avail >= addlen) return s; + + len = sdslen(s); + sh = (char*)s-sdsHdrSize(oldtype); + reqlen = newlen = (len+addlen); + assert(newlen > len); /* Catch size_t overflow */ + if (greedy == 1) { + if (newlen < SDS_MAX_PREALLOC) + newlen *= 2; + else + newlen += SDS_MAX_PREALLOC; + } + + type = sdsReqType(newlen); + + /* Don't use type 5: the user is appending to the string and type 5 is + * not able to remember empty space, so sdsMakeRoomFor() must be called + * at every appending operation. */ + if (type == SDS_TYPE_5) type = SDS_TYPE_8; + + hdrlen = sdsHdrSize(type); + assert(hdrlen + newlen + 1 > reqlen); /* Catch size_t overflow */ + if (oldtype==type) { + newsh = s_realloc_usable(sh, hdrlen+newlen+1, &usable); + if (newsh == NULL) return NULL; + s = (char*)newsh+hdrlen; + } else { + /* Since the header size changes, need to move the string forward, + * and can't use realloc */ + newsh = s_malloc_usable(hdrlen+newlen+1, &usable); + if (newsh == NULL) return NULL; + memcpy((char*)newsh+hdrlen, s, len+1); + s_free(sh); + s = (char*)newsh+hdrlen; + s[-1] = type; + sdssetlen(s, len); + } + usable = usable-hdrlen-1; + if (usable > sdsTypeMaxSize(type)) + usable = sdsTypeMaxSize(type); + sdssetalloc(s, usable); + return s; +} + +/* Enlarge the free space at the end of the sds string more than needed, + * This is useful to avoid repeated re-allocations when repeatedly appending to the sds. */ +sds sdsMakeRoomFor(sds s, size_t addlen) { + return _sdsMakeRoomFor(s, addlen, 1); +} + +/* Unlike sdsMakeRoomFor(), this one just grows to the necessary size. */ +sds sdsMakeRoomForNonGreedy(sds s, size_t addlen) { + return _sdsMakeRoomFor(s, addlen, 0); +} + +/* Reallocate the sds string so that it has no free space at the end. The + * contained string remains not altered, but next concatenation operations + * will require a reallocation. + * + * After the call, the passed sds string is no longer valid and all the + * references must be substituted with the new pointer returned by the call. */ +sds sdsRemoveFreeSpace(sds s, int would_regrow) { + return sdsResize(s, sdslen(s), would_regrow); +} + +/* Resize the allocation, this can make the allocation bigger or smaller, + * if the size is smaller than currently used len, the data will be truncated. + * + * The when the would_regrow argument is set to 1, it prevents the use of + * SDS_TYPE_5, which is desired when the sds is likely to be changed again. + * + * The sdsAlloc size will be set to the requested size regardless of the actual + * allocation size, this is done in order to avoid repeated calls to this + * function when the caller detects that it has excess space. */ +sds sdsResize(sds s, size_t size, int would_regrow) { + void *sh, *newsh; + char type, oldtype = s[-1] & SDS_TYPE_MASK; + int hdrlen, oldhdrlen = sdsHdrSize(oldtype); + size_t len = sdslen(s); + sh = (char*)s-oldhdrlen; + + /* Return ASAP if the size is already good. */ + if (sdsalloc(s) == size) return s; + + /* Truncate len if needed. */ + if (size < len) len = size; + + /* Check what would be the minimum SDS header that is just good enough to + * fit this string. */ + type = sdsReqType(size); + if (would_regrow) { + /* Don't use type 5, it is not good for strings that are expected to grow back. */ + if (type == SDS_TYPE_5) type = SDS_TYPE_8; + } + hdrlen = sdsHdrSize(type); + + /* If the type is the same, or can hold the size in it with low overhead + * (larger than SDS_TYPE_8), we just realloc(), letting the allocator + * to do the copy only if really needed. Otherwise if the change is + * huge, we manually reallocate the string to use the different header + * type. */ + int use_realloc = (oldtype==type || (type < oldtype && type > SDS_TYPE_8)); + size_t newlen = use_realloc ? oldhdrlen+size+1 : hdrlen+size+1; + + if (use_realloc) { + int alloc_already_optimal = 0; + #if defined(USE_JEMALLOC) + /* je_nallocx returns the expected allocation size for the newlen. + * We aim to avoid calling realloc() when using Jemalloc if there is no + * change in the allocation size, as it incurs a cost even if the + * allocation size stays the same. */ + alloc_already_optimal = (je_nallocx(newlen, 0) == zmalloc_size(sh)); + #endif + if (!alloc_already_optimal) { + newsh = s_realloc(sh, newlen); + if (newsh == NULL) return NULL; + s = (char*)newsh+oldhdrlen; + } + } else { + newsh = s_malloc(newlen); + if (newsh == NULL) return NULL; + memcpy((char*)newsh+hdrlen, s, len); + s_free(sh); + s = (char*)newsh+hdrlen; + s[-1] = type; + } + s[len] = 0; + sdssetlen(s, len); + sdssetalloc(s, size); + return s; +} + +/* Return the total size of the allocation of the specified sds string, + * including: + * 1) The sds header before the pointer. + * 2) The string. + * 3) The free buffer at the end if any. + * 4) The implicit null term. + */ +size_t sdsAllocSize(sds s) { + size_t alloc = sdsalloc(s); + return sdsHdrSize(s[-1])+alloc+1; +} + +/* Return the pointer of the actual SDS allocation (normally SDS strings + * are referenced by the start of the string buffer). */ +void *sdsAllocPtr(sds s) { + return (void*) (s-sdsHdrSize(s[-1])); +} + +/* Increment the sds length and decrements the left free space at the + * end of the string according to 'incr'. Also set the null term + * in the new end of the string. + * + * This function is used in order to fix the string length after the + * user calls sdsMakeRoomFor(), writes something after the end of + * the current string, and finally needs to set the new length. + * + * Note: it is possible to use a negative increment in order to + * right-trim the string. + * + * Usage example: + * + * Using sdsIncrLen() and sdsMakeRoomFor() it is possible to mount the + * following schema, to cat bytes coming from the kernel to the end of an + * sds string without copying into an intermediate buffer: + * + * oldlen = sdslen(s); + * s = sdsMakeRoomFor(s, BUFFER_SIZE); + * nread = read(fd, s+oldlen, BUFFER_SIZE); + * ... check for nread <= 0 and handle it ... + * sdsIncrLen(s, nread); + */ +void sdsIncrLen(sds s, ssize_t incr) { + unsigned char flags = s[-1]; + size_t len; + switch(flags&SDS_TYPE_MASK) { + case SDS_TYPE_5: { + unsigned char *fp = ((unsigned char*)s)-1; + unsigned char oldlen = SDS_TYPE_5_LEN(flags); + assert((incr > 0 && oldlen+incr < 32) || (incr < 0 && oldlen >= (unsigned int)(-incr))); + *fp = SDS_TYPE_5 | ((oldlen+incr) << SDS_TYPE_BITS); + len = oldlen+incr; + break; + } + case SDS_TYPE_8: { + SDS_HDR_VAR(8,s); + assert((incr >= 0 && sh->alloc-sh->len >= incr) || (incr < 0 && sh->len >= (unsigned int)(-incr))); + len = (sh->len += incr); + break; + } + case SDS_TYPE_16: { + SDS_HDR_VAR(16,s); + assert((incr >= 0 && sh->alloc-sh->len >= incr) || (incr < 0 && sh->len >= (unsigned int)(-incr))); + len = (sh->len += incr); + break; + } + case SDS_TYPE_32: { + SDS_HDR_VAR(32,s); + assert((incr >= 0 && sh->alloc-sh->len >= (unsigned int)incr) || (incr < 0 && sh->len >= (unsigned int)(-incr))); + len = (sh->len += incr); + break; + } + case SDS_TYPE_64: { + SDS_HDR_VAR(64,s); + assert((incr >= 0 && sh->alloc-sh->len >= (uint64_t)incr) || (incr < 0 && sh->len >= (uint64_t)(-incr))); + len = (sh->len += incr); + break; + } + default: len = 0; /* Just to avoid compilation warnings. */ + } + s[len] = '\0'; +} + +/* Grow the sds to have the specified length. Bytes that were not part of + * the original length of the sds will be set to zero. + * + * if the specified length is smaller than the current length, no operation + * is performed. */ +sds sdsgrowzero(sds s, size_t len) { + size_t curlen = sdslen(s); + + if (len <= curlen) return s; + s = sdsMakeRoomFor(s,len-curlen); + if (s == NULL) return NULL; + + /* Make sure added region doesn't contain garbage */ + memset(s+curlen,0,(len-curlen+1)); /* also set trailing \0 byte */ + sdssetlen(s, len); + return s; +} + +/* Append the specified binary-safe string pointed by 't' of 'len' bytes to the + * end of the specified sds string 's'. + * + * After the call, the passed sds string is no longer valid and all the + * references must be substituted with the new pointer returned by the call. */ +sds sdscatlen(sds s, const void *t, size_t len) { + size_t curlen = sdslen(s); + + s = sdsMakeRoomFor(s,len); + if (s == NULL) return NULL; + memcpy(s+curlen, t, len); + sdssetlen(s, curlen+len); + s[curlen+len] = '\0'; + return s; +} + +/* Append the specified null terminated C string to the sds string 's'. + * + * After the call, the passed sds string is no longer valid and all the + * references must be substituted with the new pointer returned by the call. */ +sds sdscat(sds s, const char *t) { + return sdscatlen(s, t, strlen(t)); +} + +/* Append the specified sds 't' to the existing sds 's'. + * + * After the call, the modified sds string is no longer valid and all the + * references must be substituted with the new pointer returned by the call. */ +sds sdscatsds(sds s, const sds t) { + return sdscatlen(s, t, sdslen(t)); +} + +/* Destructively modify the sds string 's' to hold the specified binary + * safe string pointed by 't' of length 'len' bytes. */ +sds sdscpylen(sds s, const char *t, size_t len) { + if (sdsalloc(s) < len) { + s = sdsMakeRoomFor(s,len-sdslen(s)); + if (s == NULL) return NULL; + } + memcpy(s, t, len); + s[len] = '\0'; + sdssetlen(s, len); + return s; +} + +/* Like sdscpylen() but 't' must be a null-terminated string so that the length + * of the string is obtained with strlen(). */ +sds sdscpy(sds s, const char *t) { + return sdscpylen(s, t, strlen(t)); +} + +/* Helper for sdscatlonglong() doing the actual number -> string + * conversion. 's' must point to a string with room for at least + * SDS_LLSTR_SIZE bytes. + * + * The function returns the length of the null-terminated string + * representation stored at 's'. */ +#define SDS_LLSTR_SIZE 21 +int sdsll2str(char *s, long long value) { + char *p, aux; + unsigned long long v; + size_t l; + + /* Generate the string representation, this method produces + * a reversed string. */ + if (value < 0) { + /* Since v is unsigned, if value==LLONG_MIN, -LLONG_MIN will overflow. */ + if (value != LLONG_MIN) { + v = -value; + } else { + v = ((unsigned long long)LLONG_MAX) + 1; + } + } else { + v = value; + } + + p = s; + do { + *p++ = '0'+(v%10); + v /= 10; + } while(v); + if (value < 0) *p++ = '-'; + + /* Compute length and add null term. */ + l = p-s; + *p = '\0'; + + /* Reverse the string. */ + p--; + while(s < p) { + aux = *s; + *s = *p; + *p = aux; + s++; + p--; + } + return l; +} + +/* Identical sdsll2str(), but for unsigned long long type. */ +int sdsull2str(char *s, unsigned long long v) { + char *p, aux; + size_t l; + + /* Generate the string representation, this method produces + * a reversed string. */ + p = s; + do { + *p++ = '0'+(v%10); + v /= 10; + } while(v); + + /* Compute length and add null term. */ + l = p-s; + *p = '\0'; + + /* Reverse the string. */ + p--; + while(s < p) { + aux = *s; + *s = *p; + *p = aux; + s++; + p--; + } + return l; +} + +/* Create an sds string from a long long value. It is much faster than: + * + * sdscatprintf(sdsempty(),"%lld\n", value); + */ +sds sdsfromlonglong(long long value) { + char buf[SDS_LLSTR_SIZE]; + int len = sdsll2str(buf,value); + + return sdsnewlen(buf,len); +} + +/* Like sdscatprintf() but gets va_list instead of being variadic. */ +sds sdscatvprintf(sds s, const char *fmt, va_list ap) { + va_list cpy; + char staticbuf[1024], *buf = staticbuf, *t; + size_t buflen = strlen(fmt)*2; + int bufstrlen; + + /* We try to start using a static buffer for speed. + * If not possible we revert to heap allocation. */ + if (buflen > sizeof(staticbuf)) { + buf = s_malloc(buflen); + if (buf == NULL) return NULL; + } else { + buflen = sizeof(staticbuf); + } + + /* Alloc enough space for buffer and \0 after failing to + * fit the string in the current buffer size. */ + while(1) { + va_copy(cpy,ap); + bufstrlen = vsnprintf(buf, buflen, fmt, cpy); + va_end(cpy); + if (bufstrlen < 0) { + if (buf != staticbuf) s_free(buf); + return NULL; + } + if (((size_t)bufstrlen) >= buflen) { + if (buf != staticbuf) s_free(buf); + buflen = ((size_t)bufstrlen) + 1; + buf = s_malloc(buflen); + if (buf == NULL) return NULL; + continue; + } + break; + } + + /* Finally concat the obtained string to the SDS string and return it. */ + t = sdscatlen(s, buf, bufstrlen); + if (buf != staticbuf) s_free(buf); + return t; +} + +/* Append to the sds string 's' a string obtained using printf-alike format + * specifier. + * + * After the call, the modified sds string is no longer valid and all the + * references must be substituted with the new pointer returned by the call. + * + * Example: + * + * s = sdsnew("Sum is: "); + * s = sdscatprintf(s,"%d+%d = %d",a,b,a+b). + * + * Often you need to create a string from scratch with the printf-alike + * format. When this is the need, just use sdsempty() as the target string: + * + * s = sdscatprintf(sdsempty(), "... your format ...", args); + */ +sds sdscatprintf(sds s, const char *fmt, ...) { + va_list ap; + char *t; + va_start(ap, fmt); + t = sdscatvprintf(s,fmt,ap); + va_end(ap); + return t; +} + +/* This function is similar to sdscatprintf, but much faster as it does + * not rely on sprintf() family functions implemented by the libc that + * are often very slow. Moreover directly handling the sds string as + * new data is concatenated provides a performance improvement. + * + * However this function only handles an incompatible subset of printf-alike + * format specifiers: + * + * %s - C String + * %S - SDS string + * %i - signed int + * %I - 64 bit signed integer (long long, int64_t) + * %u - unsigned int + * %U - 64 bit unsigned integer (unsigned long long, uint64_t) + * %% - Verbatim "%" character. + */ +sds sdscatfmt(sds s, char const *fmt, ...) { + size_t initlen = sdslen(s); + const char *f = fmt; + long i; + va_list ap; + + /* To avoid continuous reallocations, let's start with a buffer that + * can hold at least two times the format string itself. It's not the + * best heuristic but seems to work in practice. */ + s = sdsMakeRoomFor(s, strlen(fmt)*2); + va_start(ap,fmt); + f = fmt; /* Next format specifier byte to process. */ + i = initlen; /* Position of the next byte to write to dest str. */ + while(*f) { + char next, *str; + size_t l; + long long num; + unsigned long long unum; + + /* Make sure there is always space for at least 1 char. */ + if (sdsavail(s)==0) { + s = sdsMakeRoomFor(s,1); + } + + switch(*f) { + case '%': + next = *(f+1); + if (next == '\0') break; + f++; + switch(next) { + case 's': + case 'S': + str = va_arg(ap,char*); + l = (next == 's') ? strlen(str) : sdslen(str); + if (sdsavail(s) < l) { + s = sdsMakeRoomFor(s,l); + } + memcpy(s+i,str,l); + sdsinclen(s,l); + i += l; + break; + case 'i': + case 'I': + if (next == 'i') + num = va_arg(ap,int); + else + num = va_arg(ap,long long); + { + char buf[SDS_LLSTR_SIZE]; + l = sdsll2str(buf,num); + if (sdsavail(s) < l) { + s = sdsMakeRoomFor(s,l); + } + memcpy(s+i,buf,l); + sdsinclen(s,l); + i += l; + } + break; + case 'u': + case 'U': + if (next == 'u') + unum = va_arg(ap,unsigned int); + else + unum = va_arg(ap,unsigned long long); + { + char buf[SDS_LLSTR_SIZE]; + l = sdsull2str(buf,unum); + if (sdsavail(s) < l) { + s = sdsMakeRoomFor(s,l); + } + memcpy(s+i,buf,l); + sdsinclen(s,l); + i += l; + } + break; + default: /* Handle %% and generally %<unknown>. */ + s[i++] = next; + sdsinclen(s,1); + break; + } + break; + default: + s[i++] = *f; + sdsinclen(s,1); + break; + } + f++; + } + va_end(ap); + + /* Add null-term */ + s[i] = '\0'; + return s; +} + +/* Remove the part of the string from left and from right composed just of + * contiguous characters found in 'cset', that is a null terminated C string. + * + * After the call, the modified sds string is no longer valid and all the + * references must be substituted with the new pointer returned by the call. + * + * Example: + * + * s = sdsnew("AA...AA.a.aa.aHelloWorld :::"); + * s = sdstrim(s,"Aa. :"); + * printf("%s\n", s); + * + * Output will be just "HelloWorld". + */ +sds sdstrim(sds s, const char *cset) { + char *end, *sp, *ep; + size_t len; + + sp = s; + ep = end = s+sdslen(s)-1; + while(sp <= end && strchr(cset, *sp)) sp++; + while(ep > sp && strchr(cset, *ep)) ep--; + len = (ep-sp)+1; + if (s != sp) memmove(s, sp, len); + s[len] = '\0'; + sdssetlen(s,len); + return s; +} + +/* Changes the input string to be a subset of the original. + * It does not release the free space in the string, so a call to + * sdsRemoveFreeSpace may be wise after. */ +void sdssubstr(sds s, size_t start, size_t len) { + /* Clamp out of range input */ + size_t oldlen = sdslen(s); + if (start >= oldlen) start = len = 0; + if (len > oldlen-start) len = oldlen-start; + + /* Move the data */ + if (len) memmove(s, s+start, len); + s[len] = 0; + sdssetlen(s,len); +} + +/* Turn the string into a smaller (or equal) string containing only the + * substring specified by the 'start' and 'end' indexes. + * + * start and end can be negative, where -1 means the last character of the + * string, -2 the penultimate character, and so forth. + * + * The interval is inclusive, so the start and end characters will be part + * of the resulting string. + * + * The string is modified in-place. + * + * NOTE: this function can be misleading and can have unexpected behaviour, + * specifically when you want the length of the new string to be 0. + * Having start==end will result in a string with one character. + * please consider using sdssubstr instead. + * + * Example: + * + * s = sdsnew("Hello World"); + * sdsrange(s,1,-1); => "ello World" + */ +void sdsrange(sds s, ssize_t start, ssize_t end) { + size_t newlen, len = sdslen(s); + if (len == 0) return; + if (start < 0) + start = len + start; + if (end < 0) + end = len + end; + newlen = (start > end) ? 0 : (end-start)+1; + sdssubstr(s, start, newlen); +} + +/* Apply tolower() to every character of the sds string 's'. */ +void sdstolower(sds s) { + size_t len = sdslen(s), j; + + for (j = 0; j < len; j++) s[j] = tolower(s[j]); +} + +/* Apply toupper() to every character of the sds string 's'. */ +void sdstoupper(sds s) { + size_t len = sdslen(s), j; + + for (j = 0; j < len; j++) s[j] = toupper(s[j]); +} + +/* Compare two sds strings s1 and s2 with memcmp(). + * + * Return value: + * + * positive if s1 > s2. + * negative if s1 < s2. + * 0 if s1 and s2 are exactly the same binary string. + * + * If two strings share exactly the same prefix, but one of the two has + * additional characters, the longer string is considered to be greater than + * the smaller one. */ +int sdscmp(const sds s1, const 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? 1: (l1<l2? -1: 0); + 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(const char *s, ssize_t len, const char *sep, int seplen, int *count) { + int elements = 0, slots = 5; + long start = 0, j; + sds *tokens; + + if (seplen < 1 || len <= 0) { + *count = 0; + return NULL; + } + tokens = s_malloc(sizeof(sds)*slots); + if (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 = s_realloc(tokens,sizeof(sds)*slots); + if (newtokens == NULL) goto cleanup; + 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) goto cleanup; + 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) goto cleanup; + elements++; + *count = elements; + return tokens; + +cleanup: + { + int i; + for (i = 0; i < elements; i++) sdsfree(tokens[i]); + s_free(tokens); + *count = 0; + return NULL; + } +} + +/* Free the result returned by sdssplitlen(), or do nothing if 'tokens' is NULL. */ +void sdsfreesplitres(sds *tokens, int count) { + if (!tokens) return; + while(count--) + sdsfree(tokens[count]); + s_free(tokens); +} + +/* Append to the sds string "s" an escaped string representation where + * all the non-printable characters (tested with isprint()) are turned into + * escapes in the form "\n\r\a...." or "\x<hex-number>". + * + * After the call, the modified sds string is no longer valid and all the + * references must be substituted with the new pointer returned by the call. */ +sds sdscatrepr(sds s, const char *p, size_t len) { + s = sdscatlen(s,"\"",1); + while(len--) { + switch(*p) { + case '\\': + case '"': + s = sdscatprintf(s,"\\%c",*p); + break; + case '\n': s = sdscatlen(s,"\\n",2); break; + case '\r': s = sdscatlen(s,"\\r",2); break; + case '\t': s = sdscatlen(s,"\\t",2); break; + case '\a': s = sdscatlen(s,"\\a",2); break; + case '\b': s = sdscatlen(s,"\\b",2); break; + default: + if (isprint(*p)) + s = sdscatprintf(s,"%c",*p); + else + s = sdscatprintf(s,"\\x%02x",(unsigned char)*p); + break; + } + p++; + } + return sdscatlen(s,"\"",1); +} + +/* Returns one if the string contains characters to be escaped + * by sdscatrepr(), zero otherwise. + * + * Typically, this should be used to help protect aggregated strings in a way + * that is compatible with sdssplitargs(). For this reason, also spaces will be + * treated as needing an escape. + */ +int sdsneedsrepr(const sds s) { + size_t len = sdslen(s); + const char *p = s; + + while (len--) { + if (*p == '\\' || *p == '"' || *p == '\n' || *p == '\r' || + *p == '\t' || *p == '\a' || *p == '\b' || !isprint(*p) || isspace(*p)) return 1; + p++; + } + + return 0; +} + +/* Helper function for sdssplitargs() that returns non zero if 'c' + * is a valid hex digit. */ +int is_hex_digit(char c) { + return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || + (c >= 'A' && c <= 'F'); +} + +/* Helper function for sdssplitargs() that converts a hex digit into an + * integer from 0 to 15 */ +int hex_digit_to_int(char c) { + switch(c) { + case '0': return 0; + case '1': return 1; + case '2': return 2; + case '3': return 3; + case '4': return 4; + case '5': return 5; + case '6': return 6; + case '7': return 7; + case '8': return 8; + case '9': return 9; + case 'a': case 'A': return 10; + case 'b': case 'B': return 11; + case 'c': case 'C': return 12; + case 'd': case 'D': return 13; + case 'e': case 'E': return 14; + case 'f': case 'F': return 15; + default: return 0; + } +} + +/* Split a line into arguments, where every argument can be in the + * following programming-language REPL-alike form: + * + * foo bar "newline are supported\n" and "\xff\x00otherstuff" + * + * The number of arguments is stored into *argc, and an array + * of sds is returned. + * + * The caller should free the resulting array of sds strings with + * sdsfreesplitres(). + * + * Note that sdscatrepr() is able to convert back a string into + * a quoted string in the same format sdssplitargs() is able to parse. + * + * The function returns the allocated tokens on success, even when the + * input string is empty, or NULL if the input contains unbalanced + * quotes or closed quotes followed by non space characters + * as in: "foo"bar or "foo' + */ +sds *sdssplitargs(const char *line, int *argc) { + const char *p = line; + char *current = NULL; + char **vector = NULL; + + *argc = 0; + while(1) { + /* skip blanks */ + while(*p && isspace(*p)) p++; + if (*p) { + /* get a token */ + int inq=0; /* set to 1 if we are in "quotes" */ + int insq=0; /* set to 1 if we are in 'single quotes' */ + int done=0; + + if (current == NULL) current = sdsempty(); + while(!done) { + if (inq) { + if (*p == '\\' && *(p+1) == 'x' && + is_hex_digit(*(p+2)) && + is_hex_digit(*(p+3))) + { + unsigned char byte; + + byte = (hex_digit_to_int(*(p+2))*16)+ + hex_digit_to_int(*(p+3)); + current = sdscatlen(current,(char*)&byte,1); + p += 3; + } else if (*p == '\\' && *(p+1)) { + char c; + + p++; + switch(*p) { + case 'n': c = '\n'; break; + case 'r': c = '\r'; break; + case 't': c = '\t'; break; + case 'b': c = '\b'; break; + case 'a': c = '\a'; break; + default: c = *p; break; + } + current = sdscatlen(current,&c,1); + } else if (*p == '"') { + /* closing quote must be followed by a space or + * nothing at all. */ + if (*(p+1) && !isspace(*(p+1))) goto err; + done=1; + } else if (!*p) { + /* unterminated quotes */ + goto err; + } else { + current = sdscatlen(current,p,1); + } + } else if (insq) { + if (*p == '\\' && *(p+1) == '\'') { + p++; + current = sdscatlen(current,"'",1); + } else if (*p == '\'') { + /* closing quote must be followed by a space or + * nothing at all. */ + if (*(p+1) && !isspace(*(p+1))) goto err; + done=1; + } else if (!*p) { + /* unterminated quotes */ + goto err; + } else { + current = sdscatlen(current,p,1); + } + } else { + switch(*p) { + case ' ': + case '\n': + case '\r': + case '\t': + case '\0': + done=1; + break; + case '"': + inq=1; + break; + case '\'': + insq=1; + break; + default: + current = sdscatlen(current,p,1); + break; + } + } + if (*p) p++; + } + /* add the token to the vector */ + vector = s_realloc(vector,((*argc)+1)*sizeof(char*)); + vector[*argc] = current; + (*argc)++; + current = NULL; + } else { + /* Even on empty input string return something not NULL. */ + if (vector == NULL) vector = s_malloc(sizeof(void*)); + return vector; + } + } + +err: + while((*argc)--) + sdsfree(vector[*argc]); + s_free(vector); + if (current) sdsfree(current); + *argc = 0; + return NULL; +} + +/* Modify the string substituting all the occurrences of the set of + * characters specified in the 'from' string to the corresponding character + * in the 'to' array. + * + * For instance: sdsmapchars(mystring, "ho", "01", 2) + * will have the effect of turning the string "hello" into "0ell1". + * + * The function returns the sds string pointer, that is always the same + * as the input pointer since no resize is needed. */ +sds sdsmapchars(sds s, const char *from, const char *to, size_t setlen) { + size_t j, i, l = sdslen(s); + + for (j = 0; j < l; j++) { + for (i = 0; i < setlen; i++) { + if (s[j] == from[i]) { + s[j] = to[i]; + break; + } + } + } + return s; +} + +/* Join an array of C strings using the specified separator (also a C string). + * Returns the result as an sds string. */ +sds sdsjoin(char **argv, int argc, char *sep) { + sds join = sdsempty(); + int j; + + for (j = 0; j < argc; j++) { + join = sdscat(join, argv[j]); + if (j != argc-1) join = sdscat(join,sep); + } + return join; +} + +/* Like sdsjoin, but joins an array of SDS strings. */ +sds sdsjoinsds(sds *argv, int argc, const char *sep, size_t seplen) { + sds join = sdsempty(); + int j; + + for (j = 0; j < argc; j++) { + join = sdscatsds(join, argv[j]); + if (j != argc-1) join = sdscatlen(join,sep,seplen); + } + return join; +} + +/* Wrappers to the allocators used by SDS. Note that SDS will actually + * just use the macros defined into sdsalloc.h in order to avoid to pay + * the overhead of function calls. Here we define these wrappers only for + * the programs SDS is linked to, if they want to touch the SDS internals + * even if they use a different allocator. */ +void *sds_malloc(size_t size) { return s_malloc(size); } +void *sds_realloc(void *ptr, size_t size) { return s_realloc(ptr,size); } +void sds_free(void *ptr) { s_free(ptr); } + +/* Perform expansion of a template string and return the result as a newly + * allocated sds. + * + * Template variables are specified using curly brackets, e.g. {variable}. + * An opening bracket can be quoted by repeating it twice. + */ +sds sdstemplate(const char *template, sdstemplate_callback_t cb_func, void *cb_arg) +{ + sds res = sdsempty(); + const char *p = template; + + while (*p) { + /* Find next variable, copy everything until there */ + const char *sv = strchr(p, '{'); + if (!sv) { + /* Not found: copy till rest of template and stop */ + res = sdscat(res, p); + break; + } else if (sv > p) { + /* Found: copy anything up to the beginning of the variable */ + res = sdscatlen(res, p, sv - p); + } + + /* Skip into variable name, handle premature end or quoting */ + sv++; + if (!*sv) goto error; /* Premature end of template */ + if (*sv == '{') { + /* Quoted '{' */ + p = sv + 1; + res = sdscat(res, "{"); + continue; + } + + /* Find end of variable name, handle premature end of template */ + const char *ev = strchr(sv, '}'); + if (!ev) goto error; + + /* Pass variable name to callback and obtain value. If callback failed, + * abort. */ + sds varname = sdsnewlen(sv, ev - sv); + sds value = cb_func(varname, cb_arg); + sdsfree(varname); + if (!value) goto error; + + /* Append value to result and continue */ + res = sdscat(res, value); + sdsfree(value); + p = ev + 1; + } + + return res; + +error: + sdsfree(res); + return NULL; +} + +#ifdef REDIS_TEST +#include <stdio.h> +#include <limits.h> +#include "testhelp.h" + +#define UNUSED(x) (void)(x) + +static sds sdsTestTemplateCallback(sds varname, void *arg) { + UNUSED(arg); + static const char *_var1 = "variable1"; + static const char *_var2 = "variable2"; + + if (!strcmp(varname, _var1)) return sdsnew("value1"); + else if (!strcmp(varname, _var2)) return sdsnew("value2"); + else return NULL; +} + +int sdsTest(int argc, char **argv, int flags) { + UNUSED(argc); + UNUSED(argv); + UNUSED(flags); + + { + sds x = sdsnew("foo"), y; + + test_cond("Create a string and obtain the length", + sdslen(x) == 3 && memcmp(x,"foo\0",4) == 0); + + sdsfree(x); + x = sdsnewlen("foo",2); + test_cond("Create a string with specified length", + sdslen(x) == 2 && memcmp(x,"fo\0",3) == 0); + + x = sdscat(x,"bar"); + test_cond("Strings concatenation", + sdslen(x) == 5 && memcmp(x,"fobar\0",6) == 0); + + x = sdscpy(x,"a"); + test_cond("sdscpy() against an originally longer string", + sdslen(x) == 1 && memcmp(x,"a\0",2) == 0); + + x = sdscpy(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk"); + test_cond("sdscpy() against an originally shorter string", + sdslen(x) == 33 && + memcmp(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk\0",33) == 0); + + sdsfree(x); + x = sdscatprintf(sdsempty(),"%d",123); + test_cond("sdscatprintf() seems working in the base case", + sdslen(x) == 3 && memcmp(x,"123\0",4) == 0); + + sdsfree(x); + x = sdscatprintf(sdsempty(),"a%cb",0); + test_cond("sdscatprintf() seems working with \\0 inside of result", + sdslen(x) == 3 && memcmp(x,"a\0""b\0",4) == 0); + + { + sdsfree(x); + char etalon[1024*1024]; + for (size_t i = 0; i < sizeof(etalon); i++) { + etalon[i] = '0'; + } + x = sdscatprintf(sdsempty(),"%0*d",(int)sizeof(etalon),0); + test_cond("sdscatprintf() can print 1MB", + sdslen(x) == sizeof(etalon) && memcmp(x,etalon,sizeof(etalon)) == 0); + } + + sdsfree(x); + x = sdsnew("--"); + x = sdscatfmt(x, "Hello %s World %I,%I--", "Hi!", LLONG_MIN,LLONG_MAX); + test_cond("sdscatfmt() seems working in the base case", + sdslen(x) == 60 && + memcmp(x,"--Hello Hi! World -9223372036854775808," + "9223372036854775807--",60) == 0); + printf("[%s]\n",x); + + sdsfree(x); + x = sdsnew("--"); + x = sdscatfmt(x, "%u,%U--", UINT_MAX, ULLONG_MAX); + test_cond("sdscatfmt() seems working with unsigned numbers", + sdslen(x) == 35 && + memcmp(x,"--4294967295,18446744073709551615--",35) == 0); + + sdsfree(x); + x = sdsnew(" x "); + sdstrim(x," x"); + test_cond("sdstrim() works when all chars match", + sdslen(x) == 0); + + sdsfree(x); + x = sdsnew(" x "); + sdstrim(x," "); + test_cond("sdstrim() works when a single char remains", + sdslen(x) == 1 && x[0] == 'x'); + + sdsfree(x); + x = sdsnew("xxciaoyyy"); + sdstrim(x,"xy"); + test_cond("sdstrim() correctly trims characters", + sdslen(x) == 4 && memcmp(x,"ciao\0",5) == 0); + + y = sdsdup(x); + sdsrange(y,1,1); + test_cond("sdsrange(...,1,1)", + sdslen(y) == 1 && memcmp(y,"i\0",2) == 0); + + sdsfree(y); + y = sdsdup(x); + sdsrange(y,1,-1); + test_cond("sdsrange(...,1,-1)", + sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0); + + sdsfree(y); + y = sdsdup(x); + sdsrange(y,-2,-1); + test_cond("sdsrange(...,-2,-1)", + sdslen(y) == 2 && memcmp(y,"ao\0",3) == 0); + + sdsfree(y); + y = sdsdup(x); + sdsrange(y,2,1); + test_cond("sdsrange(...,2,1)", + sdslen(y) == 0 && memcmp(y,"\0",1) == 0); + + sdsfree(y); + y = sdsdup(x); + sdsrange(y,1,100); + test_cond("sdsrange(...,1,100)", + sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0); + + sdsfree(y); + y = sdsdup(x); + sdsrange(y,100,100); + test_cond("sdsrange(...,100,100)", + sdslen(y) == 0 && memcmp(y,"\0",1) == 0); + + sdsfree(y); + y = sdsdup(x); + sdsrange(y,4,6); + test_cond("sdsrange(...,4,6)", + sdslen(y) == 0 && memcmp(y,"\0",1) == 0); + + sdsfree(y); + y = sdsdup(x); + sdsrange(y,3,6); + test_cond("sdsrange(...,3,6)", + sdslen(y) == 1 && memcmp(y,"o\0",2) == 0); + + sdsfree(y); + sdsfree(x); + x = sdsnew("foo"); + y = sdsnew("foa"); + test_cond("sdscmp(foo,foa)", sdscmp(x,y) > 0); + + sdsfree(y); + sdsfree(x); + x = sdsnew("bar"); + y = sdsnew("bar"); + test_cond("sdscmp(bar,bar)", sdscmp(x,y) == 0); + + sdsfree(y); + sdsfree(x); + x = sdsnew("aar"); + y = sdsnew("bar"); + test_cond("sdscmp(bar,bar)", sdscmp(x,y) < 0); + + sdsfree(y); + sdsfree(x); + x = sdsnewlen("\a\n\0foo\r",7); + y = sdscatrepr(sdsempty(),x,sdslen(x)); + test_cond("sdscatrepr(...data...)", + memcmp(y,"\"\\a\\n\\x00foo\\r\"",15) == 0); + + { + unsigned int oldfree; + char *p; + int i; + size_t step = 10, j; + + sdsfree(x); + sdsfree(y); + x = sdsnew("0"); + test_cond("sdsnew() free/len buffers", sdslen(x) == 1 && sdsavail(x) == 0); + + /* Run the test a few times in order to hit the first two + * SDS header types. */ + for (i = 0; i < 10; i++) { + size_t oldlen = sdslen(x); + x = sdsMakeRoomFor(x,step); + int type = x[-1]&SDS_TYPE_MASK; + + test_cond("sdsMakeRoomFor() len", sdslen(x) == oldlen); + if (type != SDS_TYPE_5) { + test_cond("sdsMakeRoomFor() free", sdsavail(x) >= step); + oldfree = sdsavail(x); + UNUSED(oldfree); + } + p = x+oldlen; + for (j = 0; j < step; j++) { + p[j] = 'A'+j; + } + sdsIncrLen(x,step); + } + test_cond("sdsMakeRoomFor() content", + memcmp("0ABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJ",x,101) == 0); + test_cond("sdsMakeRoomFor() final length",sdslen(x)==101); + + sdsfree(x); + } + + /* Simple template */ + x = sdstemplate("v1={variable1} v2={variable2}", sdsTestTemplateCallback, NULL); + test_cond("sdstemplate() normal flow", + memcmp(x,"v1=value1 v2=value2",19) == 0); + sdsfree(x); + + /* Template with callback error */ + x = sdstemplate("v1={variable1} v3={doesnotexist}", sdsTestTemplateCallback, NULL); + test_cond("sdstemplate() with callback error", x == NULL); + + /* Template with empty var name */ + x = sdstemplate("v1={", sdsTestTemplateCallback, NULL); + test_cond("sdstemplate() with empty var name", x == NULL); + + /* Template with truncated var name */ + x = sdstemplate("v1={start", sdsTestTemplateCallback, NULL); + test_cond("sdstemplate() with truncated var name", x == NULL); + + /* Template with quoting */ + x = sdstemplate("v1={{{variable1}} {{} v2={variable2}", sdsTestTemplateCallback, NULL); + test_cond("sdstemplate() with quoting", + memcmp(x,"v1={value1} {} v2=value2",24) == 0); + sdsfree(x); + + /* Test sdsresize - extend */ + x = sdsnew("1234567890123456789012345678901234567890"); + x = sdsResize(x, 200, 1); + test_cond("sdsrezie() expand len", sdslen(x) == 40); + test_cond("sdsrezie() expand strlen", strlen(x) == 40); + test_cond("sdsrezie() expand alloc", sdsalloc(x) == 200); + /* Test sdsresize - trim free space */ + x = sdsResize(x, 80, 1); + test_cond("sdsrezie() shrink len", sdslen(x) == 40); + test_cond("sdsrezie() shrink strlen", strlen(x) == 40); + test_cond("sdsrezie() shrink alloc", sdsalloc(x) == 80); + /* Test sdsresize - crop used space */ + x = sdsResize(x, 30, 1); + test_cond("sdsrezie() crop len", sdslen(x) == 30); + test_cond("sdsrezie() crop strlen", strlen(x) == 30); + test_cond("sdsrezie() crop alloc", sdsalloc(x) == 30); + /* Test sdsresize - extend to different class */ + x = sdsResize(x, 400, 1); + test_cond("sdsrezie() expand len", sdslen(x) == 30); + test_cond("sdsrezie() expand strlen", strlen(x) == 30); + test_cond("sdsrezie() expand alloc", sdsalloc(x) == 400); + /* Test sdsresize - shrink to different class */ + x = sdsResize(x, 4, 1); + test_cond("sdsrezie() crop len", sdslen(x) == 4); + test_cond("sdsrezie() crop strlen", strlen(x) == 4); + test_cond("sdsrezie() crop alloc", sdsalloc(x) == 4); + sdsfree(x); + } + return 0; +} +#endif |