1 #include "byte.h"

     2 

     3 unsigned int byte_rchr(s,n,c)

     4 char *s;

     5 register unsigned int n;

     6 int c;

     7 {

     8   register char ch;

     9   register char *t;

    10   register char *u;

    11 

    12   ch = c;

    13   t = s;

    14   u = 0;

    15   for (;;) {

    16     if (!n) break; if (*t == ch) u = t; ++t; --n;

    17     if (!n) break; if (*t == ch) u = t; ++t; --n;

    18     if (!n) break; if (*t == ch) u = t; ++t; --n;

    19     if (!n) break; if (*t == ch) u = t; ++t; --n;

    20   }

    21   if (!u) u = t;

    22   return u - s;

    23 }