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