On Thu, Feb 14, 2019 at 02:02:37PM +0800, Xiang Xiao wrote:
> Here is the detailed description for memrchr:
>
> void *memrchr(const void *s, int c, size_t n);
>
> The memrchr() function is like the memchr() function, except
> that it searches backward from the end of the n bytes pointed
> to by s instead of forward from the beginning.
>
> The memrchr() functions return a pointer to the matching byte
> or NULL if the character does not occur in the given memory
> area.
> +void *memrchr(const void *s, int c, size_t n)
> +{
> + const unsigned char *p = s + n;
> +
> + while (n-- != 0) {
Simple:
while (n--) {
> + if ((unsigned char)c == *--p)
> + return (void *)p;
> + }
> + return NULL;
> +}
--
With Best Regards,
Andy Shevchenko
