1/* Public domain. */
 2
 3#include "byte.h"
 4
 5unsigned int byte_rchr(s,n,c)
 6char *s;
 7register unsigned int n;
 8int c;
 9{
10  register char ch;
11  register char *t;
12  register char *u;
13
14  ch = c;
15  t = s;
16  u = 0;
17  for (;;) {
18    if (!n) break; if (*t == ch) u = t; ++t; --n;
19    if (!n) break; if (*t == ch) u = t; ++t; --n;
20    if (!n) break; if (*t == ch) u = t; ++t; --n;
21    if (!n) break; if (*t == ch) u = t; ++t; --n;
22  }
23  if (!u) u = t;
24  return u - s;
25}