versions/v1_4_0/mynewt-core/libc/baselibc/src/memrchr.c

/*
 * memrchr.c
 */

#include <stddef.h>
#include <string.h>

void *memrchr(const void *s, int c, size_t n)
{
	const unsigned char *sp = (const unsigned char *)s + n - 1;

	while (n--) {
		if (*sp == (unsigned char)c)
			return (void *)sp;
		sp--;
	}

	return NULL;
}