root/arch/x86/boot/string.c

DEFINITIONS

1. strcmp
2. strnlen
3. atou

/* -*- linux-c -*- ------------------------------------------------------- *
 *
 *   Copyright (C) 1991, 1992 Linus Torvalds
 *   Copyright 2007 rPath, Inc. - All Rights Reserved
 *
 *   This file is part of the Linux kernel, and is made available under
 *   the terms of the GNU General Public License version 2.
 *
 * ----------------------------------------------------------------------- */

/*
 * Very basic string functions
 */

#include "boot.h"

int strcmp(const char *str1, const char *str2)
{
        const unsigned char *s1 = (const unsigned char *)str1;
        const unsigned char *s2 = (const unsigned char *)str2;
        int delta = 0;

        while (*s1 || *s2) {
                delta = *s2 - *s1;
                if (delta)
                        return delta;
                s1++;
                s2++;
        }
        return 0;
}

size_t strnlen(const char *s, size_t maxlen)
{
        const char *es = s;
        while (*es && maxlen) {
                es++;
                maxlen--;
        }

        return (es - s);
}

unsigned int atou(const char *s)
{
        unsigned int i = 0;
        while (isdigit(*s))
                i = i * 10 + (*s++ - '0');
        return i;
}