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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 | ||
fa97bdf9 PE |
33 | int strncmp(const char *cs, const char *ct, size_t count) |
34 | { | |
35 | unsigned char c1, c2; | |
36 | ||
37 | while (count) { | |
38 | c1 = *cs++; | |
39 | c2 = *ct++; | |
40 | if (c1 != c2) | |
41 | return c1 < c2 ? -1 : 1; | |
42 | if (!c1) | |
43 | break; | |
44 | count--; | |
45 | } | |
46 | return 0; | |
47 | } | |
48 | ||
5be86566 PA |
49 | size_t strnlen(const char *s, size_t maxlen) |
50 | { | |
51 | const char *es = s; | |
52 | while (*es && maxlen) { | |
53 | es++; | |
54 | maxlen--; | |
55 | } | |
56 | ||
57 | return (es - s); | |
58 | } | |
59 | ||
60 | unsigned int atou(const char *s) | |
61 | { | |
62 | unsigned int i = 0; | |
63 | while (isdigit(*s)) | |
64 | i = i * 10 + (*s++ - '0'); | |
65 | return i; | |
66 | } | |
fa97bdf9 PE |
67 | |
68 | /* Works only for digits and letters, but small and fast */ | |
69 | #define TOLOWER(x) ((x) | 0x20) | |
70 | ||
ce0aa5dd YL |
71 | static unsigned int simple_guess_base(const char *cp) |
72 | { | |
73 | if (cp[0] == '0') { | |
74 | if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2])) | |
75 | return 16; | |
76 | else | |
77 | return 8; | |
78 | } else { | |
79 | return 10; | |
80 | } | |
81 | } | |
82 | ||
83 | /** | |
84 | * simple_strtoull - convert a string to an unsigned long long | |
85 | * @cp: The start of the string | |
86 | * @endp: A pointer to the end of the parsed string will be placed here | |
87 | * @base: The number base to use | |
88 | */ | |
89 | ||
fa97bdf9 PE |
90 | unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base) |
91 | { | |
92 | unsigned long long result = 0; | |
93 | ||
ce0aa5dd YL |
94 | if (!base) |
95 | base = simple_guess_base(cp); | |
96 | ||
fa97bdf9 PE |
97 | if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x') |
98 | cp += 2; | |
99 | ||
100 | while (isxdigit(*cp)) { | |
101 | unsigned int value; | |
102 | ||
103 | value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10; | |
104 | if (value >= base) | |
105 | break; | |
106 | result = result * base + value; | |
107 | cp++; | |
108 | } | |
109 | if (endp) | |
110 | *endp = (char *)cp; | |
111 | ||
112 | return result; | |
113 | } |