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