^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * lib/parser.c - simple parser for mount, etc. options.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/parser.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * match_one: - Determines if a string matches a simple pattern
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * @s: the string to examine for presence of the pattern
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * @p: the string containing the pattern
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * @args: array of %MAX_OPT_ARGS &substring_t elements. Used to return match
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * locations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Description: Determines if the pattern @p is present in string @s. Can only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * match extremely simple token=arg style patterns. If the pattern is found,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * the location(s) of the arguments will be returned in the @args array.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static int match_one(char *s, const char *p, substring_t args[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) char *meta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int argc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) if (!p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) while(1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) int len = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) meta = strchr(p, '%');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if (!meta)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return strcmp(p, s) == 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (strncmp(p, s, meta-p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) s += meta - p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) p = meta + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (isdigit(*p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) len = simple_strtoul(p, (char **) &p, 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) else if (*p == '%') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) if (*s++ != '%')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) p++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) if (argc >= MAX_OPT_ARGS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) args[argc].from = s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) switch (*p++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) case 's': {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) size_t str_len = strlen(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (str_len == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) if (len == -1 || len > str_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) len = str_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) args[argc].to = s + len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) case 'd':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) simple_strtol(s, &args[argc].to, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) goto num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) case 'u':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) simple_strtoul(s, &args[argc].to, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) goto num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) case 'o':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) simple_strtoul(s, &args[argc].to, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) goto num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) case 'x':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) simple_strtoul(s, &args[argc].to, 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) num:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (args[argc].to == args[argc].from)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) s = args[argc].to;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) argc++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * match_token: - Find a token (and optional args) in a string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * @s: the string to examine for token/argument pairs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * @table: match_table_t describing the set of allowed option tokens and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * arguments that may be associated with them. Must be terminated with a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * &struct match_token whose pattern is set to the NULL pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * @args: array of %MAX_OPT_ARGS &substring_t elements. Used to return match
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * locations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * Description: Detects which if any of a set of token strings has been passed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * to it. Tokens can include up to MAX_OPT_ARGS instances of basic c-style
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * format identifiers which will be taken into account when matching the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * tokens, and whose locations will be returned in the @args array.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) int match_token(char *s, const match_table_t table, substring_t args[])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) const struct match_token *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) for (p = table; !match_one(s, p->pattern, args) ; p++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return p->token;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) EXPORT_SYMBOL(match_token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * match_number: scan a number in the given base from a substring_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * @s: substring to be scanned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * @result: resulting integer on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * @base: base to use when converting string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * Description: Given a &substring_t and a base, attempts to parse the substring
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * as a number in that base. On success, sets @result to the integer represented
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * by the string and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static int match_number(substring_t *s, int *result, int base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) char *endp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) char *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) long val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) buf = match_strdup(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) val = simple_strtol(buf, &endp, base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (endp == buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) else if (val < (long)INT_MIN || val > (long)INT_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) ret = -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) *result = (int) val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) kfree(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * match_u64int: scan a number in the given base from a substring_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * @s: substring to be scanned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * @result: resulting u64 on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) * @base: base to use when converting string
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * Description: Given a &substring_t and a base, attempts to parse the substring
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * as a number in that base. On success, sets @result to the integer represented
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * by the string and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static int match_u64int(substring_t *s, u64 *result, int base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) char *buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) u64 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) buf = match_strdup(s);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (!buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) ret = kstrtoull(buf, base, &val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) *result = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) kfree(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * match_int: - scan a decimal representation of an integer from a substring_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * @s: substring_t to be scanned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * @result: resulting integer on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * Description: Attempts to parse the &substring_t @s as a decimal integer. On
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * success, sets @result to the integer represented by the string and returns 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) int match_int(substring_t *s, int *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) return match_number(s, result, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) EXPORT_SYMBOL(match_int);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) * match_u64: - scan a decimal representation of a u64 from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * a substring_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) * @s: substring_t to be scanned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) * @result: resulting unsigned long long on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) * Description: Attempts to parse the &substring_t @s as a long decimal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) * integer. On success, sets @result to the integer represented by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) * string and returns 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) * Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) int match_u64(substring_t *s, u64 *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return match_u64int(s, result, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) EXPORT_SYMBOL(match_u64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * match_octal: - scan an octal representation of an integer from a substring_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * @s: substring_t to be scanned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * @result: resulting integer on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * Description: Attempts to parse the &substring_t @s as an octal integer. On
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) * success, sets @result to the integer represented by the string and returns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) * 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) int match_octal(substring_t *s, int *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return match_number(s, result, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) EXPORT_SYMBOL(match_octal);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) * match_hex: - scan a hex representation of an integer from a substring_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) * @s: substring_t to be scanned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) * @result: resulting integer on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) * Description: Attempts to parse the &substring_t @s as a hexadecimal integer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) * On success, sets @result to the integer represented by the string and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) * returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) int match_hex(substring_t *s, int *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) return match_number(s, result, 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) EXPORT_SYMBOL(match_hex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) * match_wildcard: - parse if a string matches given wildcard pattern
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) * @pattern: wildcard pattern
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) * @str: the string to be parsed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) * Description: Parse the string @str to check if matches wildcard
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) * pattern @pattern. The pattern may contain two type wildcardes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * '*' - matches zero or more characters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * '?' - matches one character
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * If it's matched, return true, else return false.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) bool match_wildcard(const char *pattern, const char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) const char *s = str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) const char *p = pattern;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) bool star = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) while (*s) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) switch (*p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) case '?':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) s++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) p++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) case '*':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) star = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) str = s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) if (!*++p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) pattern = p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) if (*s == *p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) s++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) p++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (!star)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) str++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) s = str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) p = pattern;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) if (*p == '*')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) ++p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) return !*p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) EXPORT_SYMBOL(match_wildcard);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * match_strlcpy: - Copy the characters from a substring_t to a sized buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * @dest: where to copy to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) * @src: &substring_t to copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) * @size: size of destination buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) * Description: Copy the characters in &substring_t @src to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * c-style string @dest. Copy no more than @size - 1 characters, plus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * the terminating NUL. Return length of @src.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) size_t match_strlcpy(char *dest, const substring_t *src, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) size_t ret = src->to - src->from;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) size_t len = ret >= size ? size - 1 : ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) memcpy(dest, src->from, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) dest[len] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) EXPORT_SYMBOL(match_strlcpy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * match_strdup: - allocate a new string with the contents of a substring_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) * @s: &substring_t to copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) * Description: Allocates and returns a string filled with the contents of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * the &substring_t @s. The caller is responsible for freeing the returned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) * string with kfree().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) char *match_strdup(const substring_t *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return kmemdup_nul(s->from, s->to - s->from, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) EXPORT_SYMBOL(match_strdup);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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