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| // SPDX-License-Identifier: GPL-2.0
| /*
| * Taken from:
| * linux/lib/string.c
| *
| * Copyright (C) 1991, 1992 Linus Torvalds
| */
|
| #include <linux/types.h>
| #include <linux/string.h>
|
| #ifndef __HAVE_ARCH_STRSTR
| /**
| * strstr - Find the first substring in a %NUL terminated string
| * @s1: The string to be searched
| * @s2: The string to search for
| */
| char *strstr(const char *s1, const char *s2)
| {
| size_t l1, l2;
|
| l2 = strlen(s2);
| if (!l2)
| return (char *)s1;
| l1 = strlen(s1);
| while (l1 >= l2) {
| l1--;
| if (!memcmp(s1, s2, l2))
| return (char *)s1;
| s1++;
| }
| return NULL;
| }
| #endif
|
| #ifndef __HAVE_ARCH_STRNCMP
| /**
| * strncmp - Compare two length-limited strings
| * @cs: One string
| * @ct: Another string
| * @count: The maximum number of bytes to compare
| */
| int strncmp(const char *cs, const char *ct, size_t count)
| {
| unsigned char c1, c2;
|
| while (count) {
| c1 = *cs++;
| c2 = *ct++;
| if (c1 != c2)
| return c1 < c2 ? -1 : 1;
| if (!c1)
| break;
| count--;
| }
| return 0;
| }
| #endif
|
|
