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Merge "libc: add memrchr" into integration

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Alexei Fedorov 2019-12-11 10:14:13 +00:00 • committed by TrustedFirmware Code Review
commit fcccd358e4
3 changed files with 26 additions and 0 deletions
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1
include/lib/libc/string.h
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@ -19,6 +19,7 @@ int memcmp(const void *s1, const void *s2, size_t len);
int strcmp(const char *s1, const char *s2); int strcmp(const char *s1, const char *s2);
int strncmp(const char *s1, const char *s2, size_t n); int strncmp(const char *s1, const char *s2, size_t n);
void *memchr(const void *src, int c, size_t len); void *memchr(const void *src, int c, size_t len);
void *memrchr(const void *src, int c, size_t len);
char *strchr(const char *s, int c); char *strchr(const char *s, int c);
void *memset(void *dst, int val, size_t count); void *memset(void *dst, int val, size_t count);
size_t strlen(const char *s); size_t strlen(const char *s);

1
lib/libc/libc.mk
View file

@ -12,6 +12,7 @@ LIBC_SRCS := $(addprefix lib/libc/, \
memcmp.c \ memcmp.c \
memcpy.c \ memcpy.c \
memmove.c \ memmove.c \
memrchr.c \
memset.c \ memset.c \
printf.c \ printf.c \
putchar.c \ putchar.c \

24
lib/libc/memrchr.c Normal file
View file

@ -0,0 +1,24 @@
/*
* Copyright (c) 2019, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <string.h>
#undef memrchr
void *memrchr(const void *src, int c, size_t len)
{
const unsigned char *s = src + (len - 1);
while (len--) {
if (*s == (unsigned char)c) {
return (void*) s;
}
s--;
}
return NULL;
}