xref: /openbmc/u-boot/lib/strto.c (revision 35f9d9bd)
1 /*
2  *  linux/lib/vsprintf.c
3  *
4  *  Copyright (C) 1991, 1992  Linus Torvalds
5  */
6 
7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
8 /*
9  * Wirzenius wrote this portably, Torvalds fucked it up :-)
10  */
11 
12 #include <common.h>
13 #include <errno.h>
14 #include <linux/ctype.h>
15 
16 /* from lib/kstrtox.c */
17 static const char *_parse_integer_fixup_radix(const char *s, unsigned int *base)
18 {
19 	if (*base == 0) {
20 		if (s[0] == '0') {
21 			if (tolower(s[1]) == 'x' && isxdigit(s[2]))
22 				*base = 16;
23 			else
24 				*base = 8;
25 		} else
26 			*base = 10;
27 	}
28 	if (*base == 16 && s[0] == '0' && tolower(s[1]) == 'x')
29 		s += 2;
30 	return s;
31 }
32 
33 unsigned long simple_strtoul(const char *cp, char **endp,
34 				unsigned int base)
35 {
36 	unsigned long result = 0;
37 	unsigned long value;
38 
39 	cp = _parse_integer_fixup_radix(cp, &base);
40 
41 	while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
42 	    ? toupper(*cp) : *cp)-'A'+10) < base) {
43 		result = result*base + value;
44 		cp++;
45 	}
46 
47 	if (endp)
48 		*endp = (char *)cp;
49 
50 	return result;
51 }
52 
53 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res)
54 {
55 	char *tail;
56 	unsigned long val;
57 	size_t len;
58 
59 	*res = 0;
60 	len = strlen(cp);
61 	if (len == 0)
62 		return -EINVAL;
63 
64 	val = simple_strtoul(cp, &tail, base);
65 	if (tail == cp)
66 		return -EINVAL;
67 
68 	if ((*tail == '\0') ||
69 		((len == (size_t)(tail - cp) + 1) && (*tail == '\n'))) {
70 		*res = val;
71 		return 0;
72 	}
73 
74 	return -EINVAL;
75 }
76 
77 long simple_strtol(const char *cp, char **endp, unsigned int base)
78 {
79 	if (*cp == '-')
80 		return -simple_strtoul(cp + 1, endp, base);
81 
82 	return simple_strtoul(cp, endp, base);
83 }
84 
85 unsigned long ustrtoul(const char *cp, char **endp, unsigned int base)
86 {
87 	unsigned long result = simple_strtoul(cp, endp, base);
88 	switch (tolower(**endp)) {
89 	case 'g':
90 		result *= 1024;
91 		/* fall through */
92 	case 'm':
93 		result *= 1024;
94 		/* fall through */
95 	case 'k':
96 		result *= 1024;
97 		(*endp)++;
98 		if (**endp == 'i')
99 			(*endp)++;
100 		if (**endp == 'B')
101 			(*endp)++;
102 	}
103 	return result;
104 }
105 
106 unsigned long long ustrtoull(const char *cp, char **endp, unsigned int base)
107 {
108 	unsigned long long result = simple_strtoull(cp, endp, base);
109 	switch (tolower(**endp)) {
110 	case 'g':
111 		result *= 1024;
112 		/* fall through */
113 	case 'm':
114 		result *= 1024;
115 		/* fall through */
116 	case 'k':
117 		result *= 1024;
118 		(*endp)++;
119 		if (**endp == 'i')
120 			(*endp)++;
121 		if (**endp == 'B')
122 			(*endp)++;
123 	}
124 	return result;
125 }
126 
127 unsigned long long simple_strtoull(const char *cp, char **endp,
128 					unsigned int base)
129 {
130 	unsigned long long result = 0, value;
131 
132 	cp = _parse_integer_fixup_radix(cp, &base);
133 
134 	while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp - '0'
135 		: (islower(*cp) ? toupper(*cp) : *cp) - 'A' + 10) < base) {
136 		result = result * base + value;
137 		cp++;
138 	}
139 
140 	if (endp)
141 		*endp = (char *) cp;
142 
143 	return result;
144 }
145 
146 long trailing_strtoln(const char *str, const char *end)
147 {
148 	const char *p;
149 
150 	if (!end)
151 		end = str + strlen(str);
152 	if (isdigit(end[-1])) {
153 		for (p = end - 1; p > str; p--) {
154 			if (!isdigit(*p))
155 				return simple_strtoul(p + 1, NULL, 10);
156 		}
157 	}
158 
159 	return -1;
160 }
161 
162 long trailing_strtol(const char *str)
163 {
164 	return trailing_strtoln(str, NULL);
165 }
166