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5be86566 PA |
1 | /* -*- linux-c -*- ------------------------------------------------------- * |
2 | * | |
3 | * Copyright (C) 1991, 1992 Linus Torvalds | |
4 | * Copyright 2007 rPath, Inc. - All Rights Reserved | |
5 | * | |
6 | * This file is part of the Linux kernel, and is made available under | |
7 | * the terms of the GNU General Public License version 2. | |
8 | * | |
9 | * ----------------------------------------------------------------------- */ | |
10 | ||
11 | /* | |
5be86566 PA |
12 | * Very basic string functions |
13 | */ | |
14 | ||
15 | #include "boot.h" | |
16 | ||
17 | int strcmp(const char *str1, const char *str2) | |
18 | { | |
19 | const unsigned char *s1 = (const unsigned char *)str1; | |
20 | const unsigned char *s2 = (const unsigned char *)str2; | |
21 | int delta = 0; | |
22 | ||
23 | while (*s1 || *s2) { | |
24 | delta = *s2 - *s1; | |
25 | if (delta) | |
26 | return delta; | |
27 | s1++; | |
28 | s2++; | |
29 | } | |
30 | return 0; | |
31 | } | |
32 | ||
33 | size_t strnlen(const char *s, size_t maxlen) | |
34 | { | |
35 | const char *es = s; | |
36 | while (*es && maxlen) { | |
37 | es++; | |
38 | maxlen--; | |
39 | } | |
40 | ||
41 | return (es - s); | |
42 | } | |
43 | ||
44 | unsigned int atou(const char *s) | |
45 | { | |
46 | unsigned int i = 0; | |
47 | while (isdigit(*s)) | |
48 | i = i * 10 + (*s++ - '0'); | |
49 | return i; | |
50 | } |