byte_rchr.c

#include "byte.h"

unsigned int
byte_rchr (char *s, register unsigned int n, int c)
{
    register char ch;
    register char *t;
    register char *u;

    ch = c;
    t = s;
    u = 0;
    for (;;)
    {
        if (!n)
            break;
        if (*t == ch)
            u = t;
        ++t;

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

    return u - s;
}