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1da177e4 LT |
1 | /* |
2 | * linux/lib/cmdline.c | |
3 | * Helper functions generally used for parsing kernel command line | |
4 | * and module options. | |
5 | * | |
6 | * Code and copyrights come from init/main.c and arch/i386/kernel/setup.c. | |
7 | * | |
8 | * This source code is licensed under the GNU General Public License, | |
9 | * Version 2. See the file COPYING for more details. | |
10 | * | |
11 | * GNU Indent formatting options for this file: -kr -i8 -npsl -pcs | |
12 | * | |
13 | */ | |
14 | ||
8bc3bcc9 | 15 | #include <linux/export.h> |
1da177e4 LT |
16 | #include <linux/kernel.h> |
17 | #include <linux/string.h> | |
18 | ||
22f2e280 DF |
19 | /* |
20 | * If a hyphen was found in get_option, this will handle the | |
21 | * range of numbers, M-N. This will expand the range and insert | |
22 | * the values[M, M+1, ..., N] into the ints array in get_options. | |
23 | */ | |
24 | ||
7b88f761 | 25 | static int get_range(char **str, int *pint, int n) |
22f2e280 DF |
26 | { |
27 | int x, inc_counter, upper_range; | |
28 | ||
29 | (*str)++; | |
30 | upper_range = simple_strtol((*str), NULL, 0); | |
31 | inc_counter = upper_range - *pint; | |
7b88f761 | 32 | for (x = *pint; n && x < upper_range; x++, n--) |
22f2e280 DF |
33 | *pint++ = x; |
34 | return inc_counter; | |
35 | } | |
1da177e4 LT |
36 | |
37 | /** | |
38 | * get_option - Parse integer from an option string | |
39 | * @str: option string | |
40 | * @pint: (output) integer value parsed from @str | |
41 | * | |
42 | * Read an int from an option string; if available accept a subsequent | |
43 | * comma as well. | |
44 | * | |
45 | * Return values: | |
72fd4a35 RD |
46 | * 0 - no int in string |
47 | * 1 - int found, no subsequent comma | |
48 | * 2 - int found including a subsequent comma | |
49 | * 3 - hyphen found to denote a range | |
1da177e4 LT |
50 | */ |
51 | ||
9fd43054 | 52 | int get_option(char **str, int *pint) |
1da177e4 LT |
53 | { |
54 | char *cur = *str; | |
55 | ||
56 | if (!cur || !(*cur)) | |
57 | return 0; | |
9fd43054 | 58 | *pint = simple_strtol(cur, str, 0); |
1da177e4 LT |
59 | if (cur == *str) |
60 | return 0; | |
61 | if (**str == ',') { | |
62 | (*str)++; | |
63 | return 2; | |
64 | } | |
22f2e280 DF |
65 | if (**str == '-') |
66 | return 3; | |
1da177e4 LT |
67 | |
68 | return 1; | |
69 | } | |
ff6f9bbb | 70 | EXPORT_SYMBOL(get_option); |
1da177e4 LT |
71 | |
72 | /** | |
73 | * get_options - Parse a string into a list of integers | |
74 | * @str: String to be parsed | |
75 | * @nints: size of integer array | |
76 | * @ints: integer array | |
77 | * | |
78 | * This function parses a string containing a comma-separated | |
22f2e280 DF |
79 | * list of integers, a hyphen-separated range of _positive_ integers, |
80 | * or a combination of both. The parse halts when the array is | |
1da177e4 LT |
81 | * full, or when no more numbers can be retrieved from the |
82 | * string. | |
83 | * | |
84 | * Return value is the character in the string which caused | |
85 | * the parse to end (typically a null terminator, if @str is | |
86 | * completely parseable). | |
87 | */ | |
9fd43054 | 88 | |
1da177e4 LT |
89 | char *get_options(const char *str, int nints, int *ints) |
90 | { | |
91 | int res, i = 1; | |
92 | ||
93 | while (i < nints) { | |
9fd43054 | 94 | res = get_option((char **)&str, ints + i); |
1da177e4 LT |
95 | if (res == 0) |
96 | break; | |
22f2e280 DF |
97 | if (res == 3) { |
98 | int range_nums; | |
7b88f761 | 99 | range_nums = get_range((char **)&str, ints + i, nints - i); |
22f2e280 DF |
100 | if (range_nums < 0) |
101 | break; | |
102 | /* | |
103 | * Decrement the result by one to leave out the | |
104 | * last number in the range. The next iteration | |
105 | * will handle the upper number in the range | |
106 | */ | |
107 | i += (range_nums - 1); | |
108 | } | |
1da177e4 LT |
109 | i++; |
110 | if (res == 1) | |
111 | break; | |
112 | } | |
113 | ints[0] = i - 1; | |
114 | return (char *)str; | |
115 | } | |
ff6f9bbb | 116 | EXPORT_SYMBOL(get_options); |
1da177e4 LT |
117 | |
118 | /** | |
119 | * memparse - parse a string with mem suffixes into a number | |
120 | * @ptr: Where parse begins | |
fd193829 | 121 | * @retptr: (output) Optional pointer to next char after parse completes |
1da177e4 LT |
122 | * |
123 | * Parses a string into a number. The number stored at @ptr is | |
e004f3c7 | 124 | * potentially suffixed with K, M, G, T, P, E. |
1da177e4 LT |
125 | */ |
126 | ||
d974ae37 | 127 | unsigned long long memparse(const char *ptr, char **retptr) |
1da177e4 | 128 | { |
fd193829 | 129 | char *endptr; /* local pointer to end of parsed string */ |
1da177e4 | 130 | |
fd193829 RD |
131 | unsigned long long ret = simple_strtoull(ptr, &endptr, 0); |
132 | ||
133 | switch (*endptr) { | |
e004f3c7 GH |
134 | case 'E': |
135 | case 'e': | |
136 | ret <<= 10; | |
137 | case 'P': | |
138 | case 'p': | |
139 | ret <<= 10; | |
140 | case 'T': | |
141 | case 't': | |
142 | ret <<= 10; | |
1da177e4 LT |
143 | case 'G': |
144 | case 'g': | |
145 | ret <<= 10; | |
146 | case 'M': | |
147 | case 'm': | |
148 | ret <<= 10; | |
149 | case 'K': | |
150 | case 'k': | |
151 | ret <<= 10; | |
fd193829 | 152 | endptr++; |
1da177e4 LT |
153 | default: |
154 | break; | |
155 | } | |
fd193829 RD |
156 | |
157 | if (retptr) | |
158 | *retptr = endptr; | |
159 | ||
1da177e4 LT |
160 | return ret; |
161 | } | |
1da177e4 | 162 | EXPORT_SYMBOL(memparse); |
6ccc72b8 DY |
163 | |
164 | /** | |
165 | * parse_option_str - Parse a string and check an option is set or not | |
166 | * @str: String to be parsed | |
167 | * @option: option name | |
168 | * | |
169 | * This function parses a string containing a comma-separated list of | |
170 | * strings like a=b,c. | |
171 | * | |
172 | * Return true if there's such option in the string, or return false. | |
173 | */ | |
174 | bool parse_option_str(const char *str, const char *option) | |
175 | { | |
176 | while (*str) { | |
177 | if (!strncmp(str, option, strlen(option))) { | |
178 | str += strlen(option); | |
179 | if (!*str || *str == ',') | |
180 | return true; | |
181 | } | |
182 | ||
183 | while (*str && *str != ',') | |
184 | str++; | |
185 | ||
186 | if (*str == ',') | |
187 | str++; | |
188 | } | |
189 | ||
190 | return false; | |
191 | } |