ref: f5bbb69877c377e1ff5e4a8cf1bfb3fc8e39b85a
dir: /sys/src/libc/port/strrchr.c/
#include <u.h>
#include <libc.h>
char*
strrchr(char *s, int c)
{
char *r;
if(c == 0)
return strchr(s, 0);
r = 0;
while(s = strchr(s, c))
r = s++;
return r;
}