1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ctype.h>
3 #include <linux/kernel.h>
4 #include <linux/errno.h>
5 #undef CONFIG_KASAN
6 #include "../lib/string.c"
7
strncmp(const char * cs,const char * ct,size_t count)8 int strncmp(const char *cs, const char *ct, size_t count)
9 {
10 unsigned char c1, c2;
11
12 while (count) {
13 c1 = *cs++;
14 c2 = *ct++;
15 if (c1 != c2)
16 return c1 < c2 ? -1 : 1;
17 if (!c1)
18 break;
19 count--;
20 }
21 return 0;
22 }
23
skip_spaces(const char * str)24 char *skip_spaces(const char *str)
25 {
26 while (isspace(*str))
27 ++str;
28 return (char *)str;
29 }
30
strim(char * s)31 char *strim(char *s)
32 {
33 size_t size;
34 char *end;
35
36 size = strlen(s);
37 if (!size)
38 return s;
39
40 end = s + size - 1;
41 while (end >= s && isspace(*end))
42 end--;
43 *(end + 1) = '\0';
44
45 return skip_spaces(s);
46 }
47
48 /* Works only for digits and letters, but small and fast */
49 #define TOLOWER(x) ((x) | 0x20)
50
simple_guess_base(const char * cp)51 static unsigned int simple_guess_base(const char *cp)
52 {
53 if (cp[0] == '0') {
54 if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))
55 return 16;
56 else
57 return 8;
58 } else {
59 return 10;
60 }
61 }
62
63 /**
64 * simple_strtoull - convert a string to an unsigned long long
65 * @cp: The start of the string
66 * @endp: A pointer to the end of the parsed string will be placed here
67 * @base: The number base to use
68 */
69
simple_strtoull(const char * cp,char ** endp,unsigned int base)70 unsigned long long simple_strtoull(const char *cp, char **endp,
71 unsigned int base)
72 {
73 unsigned long long result = 0;
74
75 if (!base)
76 base = simple_guess_base(cp);
77
78 if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')
79 cp += 2;
80
81 while (isxdigit(*cp)) {
82 unsigned int value;
83
84 value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;
85 if (value >= base)
86 break;
87 result = result * base + value;
88 cp++;
89 }
90 if (endp)
91 *endp = (char *)cp;
92
93 return result;
94 }
95
simple_strtol(const char * cp,char ** endp,unsigned int base)96 long simple_strtol(const char *cp, char **endp, unsigned int base)
97 {
98 if (*cp == '-')
99 return -simple_strtoull(cp + 1, endp, base);
100
101 return simple_strtoull(cp, endp, base);
102 }
103
kstrtobool(const char * s,bool * res)104 int kstrtobool(const char *s, bool *res)
105 {
106 if (!s)
107 return -EINVAL;
108
109 switch (s[0]) {
110 case 'y':
111 case 'Y':
112 case '1':
113 *res = true;
114 return 0;
115 case 'n':
116 case 'N':
117 case '0':
118 *res = false;
119 return 0;
120 case 'o':
121 case 'O':
122 switch (s[1]) {
123 case 'n':
124 case 'N':
125 *res = true;
126 return 0;
127 case 'f':
128 case 'F':
129 *res = false;
130 return 0;
131 default:
132 break;
133 }
134 default:
135 break;
136 }
137
138 return -EINVAL;
139 }
140