^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <linux/glob.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * The only reason this code can be compiled as a module is because the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * ATA code that depends on it can be as well. In practice, they're
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * both usually compiled in and the module overhead goes away.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) MODULE_DESCRIPTION("glob(7) matching");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) MODULE_LICENSE("Dual MIT/GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * glob_match - Shell-style pattern matching, like !fnmatch(pat, str, 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * @pat: Shell-style pattern to match, e.g. "*.[ch]".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * @str: String to match. The pattern must match the entire string.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Perform shell-style glob matching, returning true (1) if the match
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * succeeds, or false (0) if it fails. Equivalent to !fnmatch(@pat, @str, 0).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Pattern metacharacters are ?, *, [ and \.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * (And, inside character classes, !, - and ].)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * This is small and simple implementation intended for device blacklists
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * where a string is matched against a number of patterns. Thus, it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * does not preprocess the patterns. It is non-recursive, and run-time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * is at most quadratic: strlen(@str)*strlen(@pat).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * An example of the worst case is glob_match("*aaaaa", "aaaaaaaaaa");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * it takes 6 passes over the pattern before matching the string.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * Like !fnmatch(@pat, @str, 0) and unlike the shell, this does NOT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * treat / or leading . specially; it isn't actually used for pathnames.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * Note that according to glob(7) (and unlike bash), character classes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * are complemented by a leading !; this does not support the regex-style
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * [^a-z] syntax.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * An opening bracket without a matching close is matched literally.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) bool __pure glob_match(char const *pat, char const *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * Backtrack to previous * on mismatch and retry starting one
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * character later in the string. Because * matches all characters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * (no exception for /), it can be easily proved that there's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * never a need to backtrack multiple levels.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) char const *back_pat = NULL, *back_str = back_str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * Loop over each token (character or class) in pat, matching
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * it against the remaining unmatched tail of str. Return false
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * on mismatch, or true after matching the trailing nul bytes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) unsigned char c = *str++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) unsigned char d = *pat++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) switch (d) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) case '?': /* Wildcard: anything but nul */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (c == '\0')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) case '*': /* Any-length wildcard */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (*pat == '\0') /* Optimize trailing * case */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) back_pat = pat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) back_str = --str; /* Allow zero-length match */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) case '[': { /* Character class */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) bool match = false, inverted = (*pat == '!');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) char const *class = pat + inverted;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) unsigned char a = *class++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * Iterate over each span in the character class.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * A span is either a single character a, or a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * range a-b. The first span may begin with ']'.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) unsigned char b = a;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (a == '\0') /* Malformed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) goto literal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (class[0] == '-' && class[1] != ']') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) b = class[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) if (b == '\0')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) goto literal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) class += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /* Any special action if a > b? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) match |= (a <= c && c <= b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) } while ((a = *class++) != ']');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (match == inverted)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) goto backtrack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) pat = class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) case '\\':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) d = *pat++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /* fall through */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) default: /* Literal character */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) literal:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (c == d) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (d == '\0')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) backtrack:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (c == '\0' || !back_pat)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return false; /* No point continuing */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /* Try again from last *, one character later in str. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) pat = back_pat;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) str = ++back_str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) EXPORT_SYMBOL(glob_match);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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