]>
Commit | Line | Data |
---|---|---|
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> | |
f51b17c8 | 18 | #include <linux/ctype.h> |
1da177e4 | 19 | |
22f2e280 DF |
20 | /* |
21 | * If a hyphen was found in get_option, this will handle the | |
22 | * range of numbers, M-N. This will expand the range and insert | |
23 | * the values[M, M+1, ..., N] into the ints array in get_options. | |
24 | */ | |
25 | ||
a91e0f68 | 26 | static int get_range(char **str, int *pint, int n) |
22f2e280 DF |
27 | { |
28 | int x, inc_counter, upper_range; | |
29 | ||
30 | (*str)++; | |
31 | upper_range = simple_strtol((*str), NULL, 0); | |
32 | inc_counter = upper_range - *pint; | |
a91e0f68 | 33 | for (x = *pint; n && x < upper_range; x++, n--) |
22f2e280 DF |
34 | *pint++ = x; |
35 | return inc_counter; | |
36 | } | |
1da177e4 LT |
37 | |
38 | /** | |
39 | * get_option - Parse integer from an option string | |
40 | * @str: option string | |
41 | * @pint: (output) integer value parsed from @str | |
42 | * | |
43 | * Read an int from an option string; if available accept a subsequent | |
44 | * comma as well. | |
45 | * | |
46 | * Return values: | |
72fd4a35 RD |
47 | * 0 - no int in string |
48 | * 1 - int found, no subsequent comma | |
49 | * 2 - int found including a subsequent comma | |
50 | * 3 - hyphen found to denote a range | |
1da177e4 LT |
51 | */ |
52 | ||
9fd43054 | 53 | int get_option(char **str, int *pint) |
1da177e4 LT |
54 | { |
55 | char *cur = *str; | |
56 | ||
57 | if (!cur || !(*cur)) | |
58 | return 0; | |
9fd43054 | 59 | *pint = simple_strtol(cur, str, 0); |
1da177e4 LT |
60 | if (cur == *str) |
61 | return 0; | |
62 | if (**str == ',') { | |
63 | (*str)++; | |
64 | return 2; | |
65 | } | |
22f2e280 DF |
66 | if (**str == '-') |
67 | return 3; | |
1da177e4 LT |
68 | |
69 | return 1; | |
70 | } | |
ff6f9bbb | 71 | EXPORT_SYMBOL(get_option); |
1da177e4 LT |
72 | |
73 | /** | |
74 | * get_options - Parse a string into a list of integers | |
75 | * @str: String to be parsed | |
76 | * @nints: size of integer array | |
77 | * @ints: integer array | |
78 | * | |
79 | * This function parses a string containing a comma-separated | |
22f2e280 DF |
80 | * list of integers, a hyphen-separated range of _positive_ integers, |
81 | * or a combination of both. The parse halts when the array is | |
1da177e4 LT |
82 | * full, or when no more numbers can be retrieved from the |
83 | * string. | |
84 | * | |
85 | * Return value is the character in the string which caused | |
86 | * the parse to end (typically a null terminator, if @str is | |
87 | * completely parseable). | |
88 | */ | |
9fd43054 | 89 | |
1da177e4 LT |
90 | char *get_options(const char *str, int nints, int *ints) |
91 | { | |
92 | int res, i = 1; | |
93 | ||
94 | while (i < nints) { | |
9fd43054 | 95 | res = get_option((char **)&str, ints + i); |
1da177e4 LT |
96 | if (res == 0) |
97 | break; | |
22f2e280 DF |
98 | if (res == 3) { |
99 | int range_nums; | |
a91e0f68 | 100 | range_nums = get_range((char **)&str, ints + i, nints - i); |
22f2e280 DF |
101 | if (range_nums < 0) |
102 | break; | |
103 | /* | |
104 | * Decrement the result by one to leave out the | |
105 | * last number in the range. The next iteration | |
106 | * will handle the upper number in the range | |
107 | */ | |
108 | i += (range_nums - 1); | |
109 | } | |
1da177e4 LT |
110 | i++; |
111 | if (res == 1) | |
112 | break; | |
113 | } | |
114 | ints[0] = i - 1; | |
115 | return (char *)str; | |
116 | } | |
ff6f9bbb | 117 | EXPORT_SYMBOL(get_options); |
1da177e4 LT |
118 | |
119 | /** | |
120 | * memparse - parse a string with mem suffixes into a number | |
121 | * @ptr: Where parse begins | |
fd193829 | 122 | * @retptr: (output) Optional pointer to next char after parse completes |
1da177e4 LT |
123 | * |
124 | * Parses a string into a number. The number stored at @ptr is | |
e004f3c7 | 125 | * potentially suffixed with K, M, G, T, P, E. |
1da177e4 LT |
126 | */ |
127 | ||
d974ae37 | 128 | unsigned long long memparse(const char *ptr, char **retptr) |
1da177e4 | 129 | { |
fd193829 | 130 | char *endptr; /* local pointer to end of parsed string */ |
1da177e4 | 131 | |
fd193829 RD |
132 | unsigned long long ret = simple_strtoull(ptr, &endptr, 0); |
133 | ||
134 | switch (*endptr) { | |
e004f3c7 GH |
135 | case 'E': |
136 | case 'e': | |
137 | ret <<= 10; | |
138 | case 'P': | |
139 | case 'p': | |
140 | ret <<= 10; | |
141 | case 'T': | |
142 | case 't': | |
143 | ret <<= 10; | |
1da177e4 LT |
144 | case 'G': |
145 | case 'g': | |
146 | ret <<= 10; | |
147 | case 'M': | |
148 | case 'm': | |
149 | ret <<= 10; | |
150 | case 'K': | |
151 | case 'k': | |
152 | ret <<= 10; | |
fd193829 | 153 | endptr++; |
1da177e4 LT |
154 | default: |
155 | break; | |
156 | } | |
fd193829 RD |
157 | |
158 | if (retptr) | |
159 | *retptr = endptr; | |
160 | ||
1da177e4 LT |
161 | return ret; |
162 | } | |
1da177e4 | 163 | EXPORT_SYMBOL(memparse); |
6ccc72b8 DY |
164 | |
165 | /** | |
166 | * parse_option_str - Parse a string and check an option is set or not | |
167 | * @str: String to be parsed | |
168 | * @option: option name | |
169 | * | |
170 | * This function parses a string containing a comma-separated list of | |
171 | * strings like a=b,c. | |
172 | * | |
173 | * Return true if there's such option in the string, or return false. | |
174 | */ | |
175 | bool parse_option_str(const char *str, const char *option) | |
176 | { | |
177 | while (*str) { | |
178 | if (!strncmp(str, option, strlen(option))) { | |
179 | str += strlen(option); | |
180 | if (!*str || *str == ',') | |
181 | return true; | |
182 | } | |
183 | ||
184 | while (*str && *str != ',') | |
185 | str++; | |
186 | ||
187 | if (*str == ',') | |
188 | str++; | |
189 | } | |
190 | ||
191 | return false; | |
192 | } | |
f51b17c8 BH |
193 | |
194 | /* | |
195 | * Parse a string to get a param value pair. | |
196 | * You can use " around spaces, but can't escape ". | |
197 | * Hyphens and underscores equivalent in parameter names. | |
198 | */ | |
199 | char *next_arg(char *args, char **param, char **val) | |
200 | { | |
201 | unsigned int i, equals = 0; | |
202 | int in_quote = 0, quoted = 0; | |
203 | char *next; | |
204 | ||
205 | if (*args == '"') { | |
206 | args++; | |
207 | in_quote = 1; | |
208 | quoted = 1; | |
209 | } | |
210 | ||
211 | for (i = 0; args[i]; i++) { | |
212 | if (isspace(args[i]) && !in_quote) | |
213 | break; | |
214 | if (equals == 0) { | |
215 | if (args[i] == '=') | |
216 | equals = i; | |
217 | } | |
218 | if (args[i] == '"') | |
219 | in_quote = !in_quote; | |
220 | } | |
221 | ||
222 | *param = args; | |
223 | if (!equals) | |
224 | *val = NULL; | |
225 | else { | |
226 | args[equals] = '\0'; | |
227 | *val = args + equals + 1; | |
228 | ||
229 | /* Don't include quotes in value. */ | |
230 | if (**val == '"') { | |
231 | (*val)++; | |
232 | if (args[i-1] == '"') | |
233 | args[i-1] = '\0'; | |
234 | } | |
235 | } | |
236 | if (quoted && args[i-1] == '"') | |
237 | args[i-1] = '\0'; | |
238 | ||
239 | if (args[i]) { | |
240 | args[i] = '\0'; | |
241 | next = args + i + 1; | |
242 | } else | |
243 | next = args + i; | |
244 | ||
245 | /* Chew up trailing spaces. */ | |
246 | return skip_spaces(next); | |
247 | //return next; | |
248 | } |