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