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Merge pull request #3828 from oranagra/sdsnewlen_pr

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add SDS_NOINIT option to sdsnewlen to avoid unnecessary memsets.
This commit is contained in:
Salvatore Sanfilippo
2018-02-27 04:04:32 -08:00
committed by GitHub
parent 813960dbdd f86df924b0
commit d8830200b4
6 changed files with 19 additions and 11 deletions
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7
src/sds.c
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@ -39,6 +39,8 @@
#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:
@ -72,6 +74,7 @@ static inline char sdsReqType(size_t string_size) {
/* 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-termined (all the sds strings are, always) so
* even if you create an sds string with:
@ -92,7 +95,9 @@ sds sdsnewlen(const void *init, size_t initlen) {
unsigned char *fp; /* flags pointer. */
sh = s_malloc(hdrlen+initlen+1);
if (!init)
if (init==SDS_NOINIT)
init = NULL;
else if (!init)
memset(sh, 0, hdrlen+initlen+1);
if (sh == NULL) return NULL;
s = (char*)sh+hdrlen;