Thomas Gleixner | 40b0b3f | 2019-06-03 07:44:46 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * lib/parser.c - simple parser for mount, etc. options. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | */ |
| 5 | |
| 6 | #include <linux/ctype.h> |
Paul Gortmaker | 8bc3bcc | 2011-11-16 21:29:17 -0500 | [diff] [blame] | 7 | #include <linux/types.h> |
| 8 | #include <linux/export.h> |
Andy Shevchenko | 4c52729 | 2021-06-30 18:56:10 -0700 | [diff] [blame] | 9 | #include <linux/kstrtox.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/parser.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/string.h> |
| 13 | |
Li Lingfeng | 67222c4 | 2023-01-20 11:23:52 +0800 | [diff] [blame] | 14 | /* |
| 15 | * max size needed by different bases to express U64 |
| 16 | * HEX: "0xFFFFFFFFFFFFFFFF" --> 18 |
| 17 | * DEC: "18446744073709551615" --> 20 |
| 18 | * OCT: "01777777777777777777777" --> 23 |
| 19 | * pick the max one to define NUMBER_BUF_LEN |
| 20 | */ |
| 21 | #define NUMBER_BUF_LEN 24 |
| 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | /** |
BingJing Chang | b9bffa1 | 2021-01-29 13:00:37 +0800 | [diff] [blame] | 24 | * match_one - Determines if a string matches a simple pattern |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 25 | * @s: the string to examine for presence of the pattern |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | * @p: the string containing the pattern |
| 27 | * @args: array of %MAX_OPT_ARGS &substring_t elements. Used to return match |
| 28 | * locations. |
| 29 | * |
| 30 | * Description: Determines if the pattern @p is present in string @s. Can only |
| 31 | * match extremely simple token=arg style patterns. If the pattern is found, |
| 32 | * the location(s) of the arguments will be returned in the @args array. |
| 33 | */ |
David Howells | ef4533f | 2007-05-03 03:10:39 -0700 | [diff] [blame] | 34 | static int match_one(char *s, const char *p, substring_t args[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | { |
| 36 | char *meta; |
| 37 | int argc = 0; |
| 38 | |
| 39 | if (!p) |
| 40 | return 1; |
| 41 | |
| 42 | while(1) { |
| 43 | int len = -1; |
| 44 | meta = strchr(p, '%'); |
| 45 | if (!meta) |
| 46 | return strcmp(p, s) == 0; |
| 47 | |
| 48 | if (strncmp(p, s, meta-p)) |
| 49 | return 0; |
| 50 | |
| 51 | s += meta - p; |
| 52 | p = meta + 1; |
| 53 | |
| 54 | if (isdigit(*p)) |
David Howells | ef4533f | 2007-05-03 03:10:39 -0700 | [diff] [blame] | 55 | len = simple_strtoul(p, (char **) &p, 10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | else if (*p == '%') { |
| 57 | if (*s++ != '%') |
| 58 | return 0; |
| 59 | p++; |
| 60 | continue; |
| 61 | } |
| 62 | |
| 63 | if (argc >= MAX_OPT_ARGS) |
| 64 | return 0; |
| 65 | |
| 66 | args[argc].from = s; |
| 67 | switch (*p++) { |
André Goddard Rosa | b5f54b0 | 2009-12-14 18:01:08 -0800 | [diff] [blame] | 68 | case 's': { |
| 69 | size_t str_len = strlen(s); |
| 70 | |
| 71 | if (str_len == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | return 0; |
André Goddard Rosa | b5f54b0 | 2009-12-14 18:01:08 -0800 | [diff] [blame] | 73 | if (len == -1 || len > str_len) |
| 74 | len = str_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | args[argc].to = s + len; |
| 76 | break; |
André Goddard Rosa | b5f54b0 | 2009-12-14 18:01:08 -0800 | [diff] [blame] | 77 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | case 'd': |
| 79 | simple_strtol(s, &args[argc].to, 0); |
| 80 | goto num; |
| 81 | case 'u': |
| 82 | simple_strtoul(s, &args[argc].to, 0); |
| 83 | goto num; |
| 84 | case 'o': |
| 85 | simple_strtoul(s, &args[argc].to, 8); |
| 86 | goto num; |
| 87 | case 'x': |
| 88 | simple_strtoul(s, &args[argc].to, 16); |
| 89 | num: |
| 90 | if (args[argc].to == args[argc].from) |
| 91 | return 0; |
| 92 | break; |
| 93 | default: |
| 94 | return 0; |
| 95 | } |
| 96 | s = args[argc].to; |
| 97 | argc++; |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | /** |
BingJing Chang | b9bffa1 | 2021-01-29 13:00:37 +0800 | [diff] [blame] | 102 | * match_token - Find a token (and optional args) in a string |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | * @s: the string to examine for token/argument pairs |
| 104 | * @table: match_table_t describing the set of allowed option tokens and the |
| 105 | * arguments that may be associated with them. Must be terminated with a |
| 106 | * &struct match_token whose pattern is set to the NULL pointer. |
| 107 | * @args: array of %MAX_OPT_ARGS &substring_t elements. Used to return match |
| 108 | * locations. |
| 109 | * |
| 110 | * Description: Detects which if any of a set of token strings has been passed |
Randy Dunlap | edd9334 | 2021-05-06 18:03:49 -0700 | [diff] [blame] | 111 | * to it. Tokens can include up to %MAX_OPT_ARGS instances of basic c-style |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | * format identifiers which will be taken into account when matching the |
| 113 | * tokens, and whose locations will be returned in the @args array. |
| 114 | */ |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 115 | int match_token(char *s, const match_table_t table, substring_t args[]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | { |
David Howells | ef4533f | 2007-05-03 03:10:39 -0700 | [diff] [blame] | 117 | const struct match_token *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | for (p = table; !match_one(s, p->pattern, args) ; p++) |
| 120 | ; |
| 121 | |
| 122 | return p->token; |
| 123 | } |
Andrew Morton | a3d2cca | 2014-01-23 15:54:13 -0800 | [diff] [blame] | 124 | EXPORT_SYMBOL(match_token); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
| 126 | /** |
BingJing Chang | b9bffa1 | 2021-01-29 13:00:37 +0800 | [diff] [blame] | 127 | * match_number - scan a number in the given base from a substring_t |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | * @s: substring to be scanned |
| 129 | * @result: resulting integer on success |
| 130 | * @base: base to use when converting string |
| 131 | * |
| 132 | * Description: Given a &substring_t and a base, attempts to parse the substring |
Randy Dunlap | edd9334 | 2021-05-06 18:03:49 -0700 | [diff] [blame] | 133 | * as a number in that base. |
| 134 | * |
| 135 | * Return: On success, sets @result to the integer represented by the |
Eric Biggers | 359d625 | 2023-02-23 20:26:18 -0800 | [diff] [blame] | 136 | * string and returns 0. Returns -EINVAL or -ERANGE on failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | */ |
| 138 | static int match_number(substring_t *s, int *result, int base) |
| 139 | { |
| 140 | char *endp; |
Li Lingfeng | 67222c4 | 2023-01-20 11:23:52 +0800 | [diff] [blame] | 141 | char buf[NUMBER_BUF_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | int ret; |
Alex Elder | 77dd3b0 | 2012-10-04 17:13:16 -0700 | [diff] [blame] | 143 | long val; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Li Lingfeng | 67222c4 | 2023-01-20 11:23:52 +0800 | [diff] [blame] | 145 | if (match_strlcpy(buf, s, NUMBER_BUF_LEN) >= NUMBER_BUF_LEN) |
| 146 | return -ERANGE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | ret = 0; |
Alex Elder | 77dd3b0 | 2012-10-04 17:13:16 -0700 | [diff] [blame] | 148 | val = simple_strtol(buf, &endp, base); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | if (endp == buf) |
| 150 | ret = -EINVAL; |
Alex Elder | 77dd3b0 | 2012-10-04 17:13:16 -0700 | [diff] [blame] | 151 | else if (val < (long)INT_MIN || val > (long)INT_MAX) |
| 152 | ret = -ERANGE; |
| 153 | else |
| 154 | *result = (int) val; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | return ret; |
| 156 | } |
| 157 | |
| 158 | /** |
BingJing Chang | b9bffa1 | 2021-01-29 13:00:37 +0800 | [diff] [blame] | 159 | * match_u64int - scan a number in the given base from a substring_t |
James Smart | a317178 | 2016-10-21 23:51:54 +0300 | [diff] [blame] | 160 | * @s: substring to be scanned |
| 161 | * @result: resulting u64 on success |
| 162 | * @base: base to use when converting string |
| 163 | * |
| 164 | * Description: Given a &substring_t and a base, attempts to parse the substring |
Randy Dunlap | edd9334 | 2021-05-06 18:03:49 -0700 | [diff] [blame] | 165 | * as a number in that base. |
| 166 | * |
| 167 | * Return: On success, sets @result to the integer represented by the |
Eric Biggers | 359d625 | 2023-02-23 20:26:18 -0800 | [diff] [blame] | 168 | * string and returns 0. Returns -EINVAL or -ERANGE on failure. |
James Smart | a317178 | 2016-10-21 23:51:54 +0300 | [diff] [blame] | 169 | */ |
| 170 | static int match_u64int(substring_t *s, u64 *result, int base) |
| 171 | { |
Li Lingfeng | 67222c4 | 2023-01-20 11:23:52 +0800 | [diff] [blame] | 172 | char buf[NUMBER_BUF_LEN]; |
James Smart | a317178 | 2016-10-21 23:51:54 +0300 | [diff] [blame] | 173 | int ret; |
| 174 | u64 val; |
James Smart | a317178 | 2016-10-21 23:51:54 +0300 | [diff] [blame] | 175 | |
Li Lingfeng | 67222c4 | 2023-01-20 11:23:52 +0800 | [diff] [blame] | 176 | if (match_strlcpy(buf, s, NUMBER_BUF_LEN) >= NUMBER_BUF_LEN) |
| 177 | return -ERANGE; |
James Smart | a317178 | 2016-10-21 23:51:54 +0300 | [diff] [blame] | 178 | ret = kstrtoull(buf, base, &val); |
| 179 | if (!ret) |
| 180 | *result = val; |
James Smart | a317178 | 2016-10-21 23:51:54 +0300 | [diff] [blame] | 181 | return ret; |
| 182 | } |
| 183 | |
| 184 | /** |
BingJing Chang | b9bffa1 | 2021-01-29 13:00:37 +0800 | [diff] [blame] | 185 | * match_int - scan a decimal representation of an integer from a substring_t |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | * @s: substring_t to be scanned |
| 187 | * @result: resulting integer on success |
| 188 | * |
Randy Dunlap | edd9334 | 2021-05-06 18:03:49 -0700 | [diff] [blame] | 189 | * Description: Attempts to parse the &substring_t @s as a decimal integer. |
| 190 | * |
| 191 | * Return: On success, sets @result to the integer represented by the string |
Eric Biggers | 359d625 | 2023-02-23 20:26:18 -0800 | [diff] [blame] | 192 | * and returns 0. Returns -EINVAL or -ERANGE on failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | */ |
| 194 | int match_int(substring_t *s, int *result) |
| 195 | { |
| 196 | return match_number(s, result, 0); |
| 197 | } |
Andrew Morton | a3d2cca | 2014-01-23 15:54:13 -0800 | [diff] [blame] | 198 | EXPORT_SYMBOL(match_int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
Randy Dunlap | edd9334 | 2021-05-06 18:03:49 -0700 | [diff] [blame] | 200 | /** |
BingJing Chang | 01531ac | 2021-01-29 12:52:42 +0800 | [diff] [blame] | 201 | * match_uint - scan a decimal representation of an integer from a substring_t |
| 202 | * @s: substring_t to be scanned |
| 203 | * @result: resulting integer on success |
| 204 | * |
Randy Dunlap | edd9334 | 2021-05-06 18:03:49 -0700 | [diff] [blame] | 205 | * Description: Attempts to parse the &substring_t @s as a decimal integer. |
| 206 | * |
| 207 | * Return: On success, sets @result to the integer represented by the string |
Eric Biggers | 359d625 | 2023-02-23 20:26:18 -0800 | [diff] [blame] | 208 | * and returns 0. Returns -EINVAL or -ERANGE on failure. |
BingJing Chang | 01531ac | 2021-01-29 12:52:42 +0800 | [diff] [blame] | 209 | */ |
| 210 | int match_uint(substring_t *s, unsigned int *result) |
| 211 | { |
Li Lingfeng | 67222c4 | 2023-01-20 11:23:52 +0800 | [diff] [blame] | 212 | char buf[NUMBER_BUF_LEN]; |
BingJing Chang | 01531ac | 2021-01-29 12:52:42 +0800 | [diff] [blame] | 213 | |
Li Lingfeng | 67222c4 | 2023-01-20 11:23:52 +0800 | [diff] [blame] | 214 | if (match_strlcpy(buf, s, NUMBER_BUF_LEN) >= NUMBER_BUF_LEN) |
| 215 | return -ERANGE; |
| 216 | |
| 217 | return kstrtouint(buf, 10, result); |
BingJing Chang | 01531ac | 2021-01-29 12:52:42 +0800 | [diff] [blame] | 218 | } |
| 219 | EXPORT_SYMBOL(match_uint); |
| 220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | /** |
BingJing Chang | b9bffa1 | 2021-01-29 13:00:37 +0800 | [diff] [blame] | 222 | * match_u64 - scan a decimal representation of a u64 from |
James Smart | a317178 | 2016-10-21 23:51:54 +0300 | [diff] [blame] | 223 | * a substring_t |
| 224 | * @s: substring_t to be scanned |
| 225 | * @result: resulting unsigned long long on success |
| 226 | * |
| 227 | * Description: Attempts to parse the &substring_t @s as a long decimal |
Randy Dunlap | edd9334 | 2021-05-06 18:03:49 -0700 | [diff] [blame] | 228 | * integer. |
| 229 | * |
| 230 | * Return: On success, sets @result to the integer represented by the string |
Eric Biggers | 359d625 | 2023-02-23 20:26:18 -0800 | [diff] [blame] | 231 | * and returns 0. Returns -EINVAL or -ERANGE on failure. |
James Smart | a317178 | 2016-10-21 23:51:54 +0300 | [diff] [blame] | 232 | */ |
| 233 | int match_u64(substring_t *s, u64 *result) |
| 234 | { |
| 235 | return match_u64int(s, result, 0); |
| 236 | } |
| 237 | EXPORT_SYMBOL(match_u64); |
| 238 | |
| 239 | /** |
BingJing Chang | b9bffa1 | 2021-01-29 13:00:37 +0800 | [diff] [blame] | 240 | * match_octal - scan an octal representation of an integer from a substring_t |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | * @s: substring_t to be scanned |
| 242 | * @result: resulting integer on success |
| 243 | * |
Randy Dunlap | edd9334 | 2021-05-06 18:03:49 -0700 | [diff] [blame] | 244 | * Description: Attempts to parse the &substring_t @s as an octal integer. |
| 245 | * |
| 246 | * Return: On success, sets @result to the integer represented by the string |
Eric Biggers | 359d625 | 2023-02-23 20:26:18 -0800 | [diff] [blame] | 247 | * and returns 0. Returns -EINVAL or -ERANGE on failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | */ |
| 249 | int match_octal(substring_t *s, int *result) |
| 250 | { |
| 251 | return match_number(s, result, 8); |
| 252 | } |
Andrew Morton | a3d2cca | 2014-01-23 15:54:13 -0800 | [diff] [blame] | 253 | EXPORT_SYMBOL(match_octal); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
| 255 | /** |
BingJing Chang | b9bffa1 | 2021-01-29 13:00:37 +0800 | [diff] [blame] | 256 | * match_hex - scan a hex representation of an integer from a substring_t |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | * @s: substring_t to be scanned |
| 258 | * @result: resulting integer on success |
| 259 | * |
| 260 | * Description: Attempts to parse the &substring_t @s as a hexadecimal integer. |
Randy Dunlap | edd9334 | 2021-05-06 18:03:49 -0700 | [diff] [blame] | 261 | * |
| 262 | * Return: On success, sets @result to the integer represented by the string |
Eric Biggers | 359d625 | 2023-02-23 20:26:18 -0800 | [diff] [blame] | 263 | * and returns 0. Returns -EINVAL or -ERANGE on failure. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | */ |
| 265 | int match_hex(substring_t *s, int *result) |
| 266 | { |
| 267 | return match_number(s, result, 16); |
| 268 | } |
Andrew Morton | a3d2cca | 2014-01-23 15:54:13 -0800 | [diff] [blame] | 269 | EXPORT_SYMBOL(match_hex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | |
| 271 | /** |
BingJing Chang | b9bffa1 | 2021-01-29 13:00:37 +0800 | [diff] [blame] | 272 | * match_wildcard - parse if a string matches given wildcard pattern |
Du, Changbin | aace050 | 2014-01-23 15:54:12 -0800 | [diff] [blame] | 273 | * @pattern: wildcard pattern |
| 274 | * @str: the string to be parsed |
| 275 | * |
| 276 | * Description: Parse the string @str to check if matches wildcard |
Randy Dunlap | edd9334 | 2021-05-06 18:03:49 -0700 | [diff] [blame] | 277 | * pattern @pattern. The pattern may contain two types of wildcards: |
Du, Changbin | aace050 | 2014-01-23 15:54:12 -0800 | [diff] [blame] | 278 | * '*' - matches zero or more characters |
| 279 | * '?' - matches one character |
Randy Dunlap | edd9334 | 2021-05-06 18:03:49 -0700 | [diff] [blame] | 280 | * |
| 281 | * Return: If the @str matches the @pattern, return true, else return false. |
Du, Changbin | aace050 | 2014-01-23 15:54:12 -0800 | [diff] [blame] | 282 | */ |
| 283 | bool match_wildcard(const char *pattern, const char *str) |
| 284 | { |
| 285 | const char *s = str; |
| 286 | const char *p = pattern; |
| 287 | bool star = false; |
| 288 | |
| 289 | while (*s) { |
| 290 | switch (*p) { |
| 291 | case '?': |
| 292 | s++; |
| 293 | p++; |
| 294 | break; |
| 295 | case '*': |
| 296 | star = true; |
| 297 | str = s; |
| 298 | if (!*++p) |
| 299 | return true; |
| 300 | pattern = p; |
| 301 | break; |
| 302 | default: |
| 303 | if (*s == *p) { |
| 304 | s++; |
| 305 | p++; |
| 306 | } else { |
| 307 | if (!star) |
| 308 | return false; |
| 309 | str++; |
| 310 | s = str; |
| 311 | p = pattern; |
| 312 | } |
| 313 | break; |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | if (*p == '*') |
| 318 | ++p; |
| 319 | return !*p; |
| 320 | } |
Andrew Morton | a3d2cca | 2014-01-23 15:54:13 -0800 | [diff] [blame] | 321 | EXPORT_SYMBOL(match_wildcard); |
Du, Changbin | aace050 | 2014-01-23 15:54:12 -0800 | [diff] [blame] | 322 | |
| 323 | /** |
BingJing Chang | b9bffa1 | 2021-01-29 13:00:37 +0800 | [diff] [blame] | 324 | * match_strlcpy - Copy the characters from a substring_t to a sized buffer |
Markus Armbruster | b32a09d | 2008-02-26 09:57:11 -0600 | [diff] [blame] | 325 | * @dest: where to copy to |
| 326 | * @src: &substring_t to copy |
| 327 | * @size: size of destination buffer |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | * |
Markus Armbruster | b32a09d | 2008-02-26 09:57:11 -0600 | [diff] [blame] | 329 | * Description: Copy the characters in &substring_t @src to the |
| 330 | * c-style string @dest. Copy no more than @size - 1 characters, plus |
Randy Dunlap | edd9334 | 2021-05-06 18:03:49 -0700 | [diff] [blame] | 331 | * the terminating NUL. |
| 332 | * |
| 333 | * Return: length of @src. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | */ |
Markus Armbruster | b32a09d | 2008-02-26 09:57:11 -0600 | [diff] [blame] | 335 | size_t match_strlcpy(char *dest, const substring_t *src, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | { |
Markus Armbruster | b32a09d | 2008-02-26 09:57:11 -0600 | [diff] [blame] | 337 | size_t ret = src->to - src->from; |
| 338 | |
| 339 | if (size) { |
| 340 | size_t len = ret >= size ? size - 1 : ret; |
| 341 | memcpy(dest, src->from, len); |
| 342 | dest[len] = '\0'; |
| 343 | } |
| 344 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | } |
Andrew Morton | a3d2cca | 2014-01-23 15:54:13 -0800 | [diff] [blame] | 346 | EXPORT_SYMBOL(match_strlcpy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
| 348 | /** |
BingJing Chang | b9bffa1 | 2021-01-29 13:00:37 +0800 | [diff] [blame] | 349 | * match_strdup - allocate a new string with the contents of a substring_t |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | * @s: &substring_t to copy |
| 351 | * |
| 352 | * Description: Allocates and returns a string filled with the contents of |
| 353 | * the &substring_t @s. The caller is responsible for freeing the returned |
| 354 | * string with kfree(). |
Randy Dunlap | edd9334 | 2021-05-06 18:03:49 -0700 | [diff] [blame] | 355 | * |
| 356 | * Return: the address of the newly allocated NUL-terminated string or |
| 357 | * %NULL on error. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | */ |
David Howells | ef4533f | 2007-05-03 03:10:39 -0700 | [diff] [blame] | 359 | char *match_strdup(const substring_t *s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | { |
Eric Biggers | 30f7bc9 | 2018-10-30 15:05:22 -0700 | [diff] [blame] | 361 | return kmemdup_nul(s->from, s->to - s->from, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | EXPORT_SYMBOL(match_strdup); |