Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/ctype.h>
3#include <linux/kernel.h>
4#include <linux/errno.h>
5#include "../lib/string.c"
6
7int strncmp(const char *cs, const char *ct, size_t count)
8{
9 unsigned char c1, c2;
10
11 while (count) {
12 c1 = *cs++;
13 c2 = *ct++;
14 if (c1 != c2)
15 return c1 < c2 ? -1 : 1;
16 if (!c1)
17 break;
18 count--;
19 }
20 return 0;
21}
22
23char *skip_spaces(const char *str)
24{
25 while (isspace(*str))
26 ++str;
27 return (char *)str;
28}
29
30char *strim(char *s)
31{
32 size_t size;
33 char *end;
34
35 size = strlen(s);
36 if (!size)
37 return s;
38
39 end = s + size - 1;
40 while (end >= s && isspace(*end))
41 end--;
42 *(end + 1) = '\0';
43
44 return skip_spaces(s);
45}
46
47/* Works only for digits and letters, but small and fast */
48#define TOLOWER(x) ((x) | 0x20)
49
50static unsigned int simple_guess_base(const char *cp)
51{
52 if (cp[0] == '0') {
53 if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
54 return 16;
55 else
56 return 8;
57 } else {
58 return 10;
59 }
60}
61
62/**
63 * simple_strtoull - convert a string to an unsigned long long
64 * @cp: The start of the string
65 * @endp: A pointer to the end of the parsed string will be placed here
66 * @base: The number base to use
67 */
68
69unsigned long long simple_strtoull(const char *cp, char **endp,
70 unsigned int base)
71{
72 unsigned long long result = 0;
73
74 if (!base)
75 base = simple_guess_base(cp);
76
77 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
78 cp += 2;
79
80 while (isxdigit(*cp)) {
81 unsigned int value;
82
83 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
84 if (value >= base)
85 break;
86 result = result * base + value;
87 cp++;
88 }
89 if (endp)
90 *endp = (char *)cp;
91
92 return result;
93}
94
95long simple_strtol(const char *cp, char **endp, unsigned int base)
96{
97 if (*cp == '-')
98 return -simple_strtoull(cp + 1, endp, base);
99
100 return simple_strtoull(cp, endp, base);
101}
102
103int kstrtobool(const char *s, bool *res)
104{
105 if (!s)
106 return -EINVAL;
107
108 switch (s[0]) {
109 case 'y':
110 case 'Y':
111 case '1':
112 *res = true;
113 return 0;
114 case 'n':
115 case 'N':
116 case '0':
117 *res = false;
118 return 0;
119 case 'o':
120 case 'O':
121 switch (s[1]) {
122 case 'n':
123 case 'N':
124 *res = true;
125 return 0;
126 case 'f':
127 case 'F':
128 *res = false;
129 return 0;
130 default:
131 break;
132 }
133 default:
134 break;
135 }
136
137 return -EINVAL;
138}