ref: bc7d74f09b53c39ada4e73ce73c01c6c0928f9f4
dir: /sys/src/cmd/unix/drawterm/libc/runestrrchr.c/
#include <u.h>
#include <libc.h>
Rune*
runestrrchr(Rune *s, Rune c)
{
Rune *r;
if(c == 0)
return runestrchr(s, 0);
r = 0;
while(s = runestrchr(s, c))
r = s++;
return r;
}