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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
7d85c434 WN |
2 | /* |
3 | * linux/tools/lib/string.c | |
4 | * | |
5 | * Copied from linux/lib/string.c, where it is: | |
6 | * | |
7 | * Copyright (C) 1991, 1992 Linus Torvalds | |
8 | * | |
9 | * More specifically, the first copied function was strtobool, which | |
10 | * was introduced by: | |
11 | * | |
12 | * d0f1fed29e6e ("Add a strtobool function matching semantics of existing in kernel equivalents") | |
13 | * Author: Jonathan Cameron <jic23@cam.ac.uk> | |
14 | */ | |
15 | ||
4ddd3274 ACM |
16 | #include <stdlib.h> |
17 | #include <string.h> | |
7d85c434 | 18 | #include <errno.h> |
4ddd3274 | 19 | #include <linux/string.h> |
ce990917 | 20 | #include <linux/compiler.h> |
4ddd3274 ACM |
21 | |
22 | /** | |
23 | * memdup - duplicate region of memory | |
24 | * | |
25 | * @src: memory region to duplicate | |
26 | * @len: memory region length | |
27 | */ | |
28 | void *memdup(const void *src, size_t len) | |
29 | { | |
30 | void *p = malloc(len); | |
31 | ||
32 | if (p) | |
33 | memcpy(p, src, len); | |
34 | ||
35 | return p; | |
36 | } | |
7d85c434 WN |
37 | |
38 | /** | |
39 | * strtobool - convert common user inputs into boolean values | |
40 | * @s: input string | |
41 | * @res: result | |
42 | * | |
b99e4850 ACM |
43 | * This routine returns 0 iff the first character is one of 'Yy1Nn0', or |
44 | * [oO][NnFf] for "on" and "off". Otherwise it will return -EINVAL. Value | |
45 | * pointed to by res is updated upon finding a match. | |
7d85c434 WN |
46 | */ |
47 | int strtobool(const char *s, bool *res) | |
48 | { | |
b99e4850 ACM |
49 | if (!s) |
50 | return -EINVAL; | |
51 | ||
7d85c434 WN |
52 | switch (s[0]) { |
53 | case 'y': | |
54 | case 'Y': | |
55 | case '1': | |
56 | *res = true; | |
b99e4850 | 57 | return 0; |
7d85c434 WN |
58 | case 'n': |
59 | case 'N': | |
60 | case '0': | |
61 | *res = false; | |
b99e4850 ACM |
62 | return 0; |
63 | case 'o': | |
64 | case 'O': | |
65 | switch (s[1]) { | |
66 | case 'n': | |
67 | case 'N': | |
68 | *res = true; | |
69 | return 0; | |
70 | case 'f': | |
71 | case 'F': | |
72 | *res = false; | |
73 | return 0; | |
74 | default: | |
75 | break; | |
76 | } | |
7d85c434 | 77 | default: |
b99e4850 | 78 | break; |
7d85c434 | 79 | } |
b99e4850 ACM |
80 | |
81 | return -EINVAL; | |
7d85c434 | 82 | } |
ce990917 JP |
83 | |
84 | /** | |
85 | * strlcpy - Copy a C-string into a sized buffer | |
86 | * @dest: Where to copy the string to | |
87 | * @src: Where to copy the string from | |
88 | * @size: size of destination buffer | |
89 | * | |
90 | * Compatible with *BSD: the result is always a valid | |
91 | * NUL-terminated string that fits in the buffer (unless, | |
92 | * of course, the buffer size is zero). It does not pad | |
93 | * out the result like strncpy() does. | |
94 | * | |
95 | * If libc has strlcpy() then that version will override this | |
96 | * implementation: | |
97 | */ | |
98 | size_t __weak strlcpy(char *dest, const char *src, size_t size) | |
99 | { | |
100 | size_t ret = strlen(src); | |
101 | ||
102 | if (size) { | |
103 | size_t len = (ret >= size) ? size - 1 : ret; | |
104 | memcpy(dest, src, len); | |
105 | dest[len] = '\0'; | |
106 | } | |
107 | return ret; | |
108 | } |