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string/strdupa: support strdupa strndupa

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refs:https://sites.uclouvain.be/SystInfo/manpages/man3/strdup.3.html

Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
This commit is contained in:
dongjiuzhu1 2022-12-30 22:01:06 +08:00 committed by Xiang Xiao
parent 7660ece921
commit 191d453063
1 changed files with 10 additions and 0 deletions
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10
include/string.h
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@ -29,15 +29,25 @@
#include <nuttx/compiler.h> #include <nuttx/compiler.h>
#include <stddef.h> #include <stddef.h>
#include <alloca.h>
/**************************************************************************** /****************************************************************************
* Pre-processor Definitions * Pre-processor Definitions
****************************************************************************/ ****************************************************************************/
#define strcoll_l(s1, s2, l) strcoll(s1, s2) #define strcoll_l(s1, s2, l) strcoll(s1, s2)
#define strdupa(x) strcpy(alloca(strlen(x) + 1), x)
#define strerror_l(e, l) strerror(e) #define strerror_l(e, l) strerror(e)
#define strxfrm_l(s1, s2, n, l) strxfrm(s1, s2, n) #define strxfrm_l(s1, s2, n, l) strxfrm(s1, s2, n)
#define strndupa(x, l) ({ \
FAR const char *__old = (x); \
size_t __len = strnlen(__old, (l)); \
FAR char *__new = alloca(__len + 1); \
__new[__len] = '\0'; \
(FAR char *)memcpy(__new, __old, __len); \
})
/**************************************************************************** /****************************************************************************
* Public Function Prototypes * Public Function Prototypes
****************************************************************************/ ****************************************************************************/