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string.c

/* -*- 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.
 *
 * ----------------------------------------------------------------------- */

/*
 * arch/i386/boot/string.c
 *
 * 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;
}

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