LXR linux/drivers/firmware/efi/libstub/string.c

   1/*
   2 * Taken from:
   3 *  linux/lib/string.c
   4 *
   5 *  Copyright (C) 1991, 1992  Linus Torvalds
   6 */
   7
   8#include <linux/types.h>
   9#include <linux/string.h>
  10
  11#ifndef __HAVE_ARCH_STRSTR
  12/**
  13 * strstr - Find the first substring in a %NUL terminated string
  14 * @s1: The string to be searched
  15 * @s2: The string to search for
  16 */
  17char *strstr(const char *s1, const char *s2)
  18{
  19        size_t l1, l2;
  20
  21        l2 = strlen(s2);
  22        if (!l2)
  23                return (char *)s1;
  24        l1 = strlen(s1);
  25        while (l1 >= l2) {
  26                l1--;
  27                if (!memcmp(s1, s2, l2))
  28                        return (char *)s1;
  29                s1++;
  30        }
  31        return NULL;
  32}
  33#endif
  34
  35#ifndef __HAVE_ARCH_STRNCMP
  36/**
  37 * strncmp - Compare two length-limited strings
  38 * @cs: One string
  39 * @ct: Another string
  40 * @count: The maximum number of bytes to compare
  41 */
  42int strncmp(const char *cs, const char *ct, size_t count)
  43{
  44        unsigned char c1, c2;
  45
  46        while (count) {
  47                c1 = *cs++;
  48                c2 = *ct++;
  49                if (c1 != c2)
  50                        return c1 < c2 ? -1 : 1;
  51                if (!c1)
  52                        break;
  53                count--;
  54        }
  55        return 0;
  56}
  57#endif
  58