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
15#include <stdlib.h>
16#include <string.h>
17#include <errno.h>
18#include <linux/string.h>
19#include <linux/compiler.h>
20
21/**
22 * memdup - duplicate region of memory
23 *
24 * @src: memory region to duplicate
25 * @len: memory region length
26 */
27void *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}
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 */
46int 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}
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 */
79size_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}