perf tools: Don't clone maps from parent when synthesizing forks
[linux/fpc-iii.git] / tools / lib / string.c
blob93b3d4b6feac378d81c2f189310399518efc611f
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/tools/lib/string.c
5 * Copied from linux/lib/string.c, where it is:
7 * Copyright (C) 1991, 1992 Linus Torvalds
9 * More specifically, the first copied function was strtobool, which
10 * was introduced by:
12 * d0f1fed29e6e ("Add a strtobool function matching semantics of existing in kernel equivalents")
13 * Author: Jonathan Cameron <jic23@cam.ac.uk>
16 #include <stdlib.h>
17 #include <string.h>
18 #include <errno.h>
19 #include <linux/string.h>
20 #include <linux/compiler.h>
22 /**
23 * memdup - duplicate region of memory
25 * @src: memory region to duplicate
26 * @len: memory region length
28 void *memdup(const void *src, size_t len)
30 void *p = malloc(len);
32 if (p)
33 memcpy(p, src, len);
35 return p;
38 /**
39 * strtobool - convert common user inputs into boolean values
40 * @s: input string
41 * @res: result
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.
47 int strtobool(const char *s, bool *res)
49 if (!s)
50 return -EINVAL;
52 switch (s[0]) {
53 case 'y':
54 case 'Y':
55 case '1':
56 *res = true;
57 return 0;
58 case 'n':
59 case 'N':
60 case '0':
61 *res = false;
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;
77 default:
78 break;
81 return -EINVAL;
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
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.
95 * If libc has strlcpy() then that version will override this
96 * implementation:
98 size_t __weak strlcpy(char *dest, const char *src, size_t size)
100 size_t ret = strlen(src);
102 if (size) {
103 size_t len = (ret >= size) ? size - 1 : ret;
104 memcpy(dest, src, len);
105 dest[len] = '\0';
107 return ret;