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All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package filepath import ( "errors" "os" "runtime" "sort" "strings" "unicode/utf8" ) // ErrBadPattern indicates a pattern was malformed. var ErrBadPattern = errors.New("syntax error in pattern") // Match reports whether name matches the shell file name pattern. // The pattern syntax is: // // pattern: // { term } // term: // '*' matches any sequence of non-Separator characters // '?' matches any single non-Separator character // '[' [ '^' ] { character-range } ']' // character class (must be non-empty) // c matches character c (c != '*', '?', '\\', '[') // '\\' c matches character c // // character-range: // c matches character c (c != '\\', '-', ']') // '\\' c matches character c // lo '-' hi matches character c for lo <= c <= hi // // Match requires pattern to match all of name, not just a substring. // The only possible returned error is [ErrBadPattern], when pattern // is malformed. // // On Windows, escaping is disabled. Instead, '\\' is treated as // path separator. func Match(pattern, name string) (matched bool, err error) { Pattern: for len(pattern) > 0 { var star bool var chunk string star, chunk, pattern = scanChunk(pattern) if star && chunk == "" { // Trailing * matches rest of string unless it has a /. return !strings.Contains(name, string(Separator)), nil } // Look for match at current position. t, ok, err := matchChunk(chunk, name) // if we're the last chunk, make sure we've exhausted the name // otherwise we'll give a false result even if we could still match // using the star if ok && (len(t) == 0 || len(pattern) > 0) { name = t continue } if err != nil { return false, err } if star { // Look for match skipping i+1 bytes. // Cannot skip /. for i := 0; i < len(name) && name[i] != Separator; i++ { t, ok, err := matchChunk(chunk, name[i+1:]) if ok { // if we're the last chunk, make sure we exhausted the name if len(pattern) == 0 && len(t) > 0 { continue } name = t continue Pattern } if err != nil { return false, err } } } return false, nil } return len(name) == 0, nil } // scanChunk gets the next segment of pattern, which is a non-star string // possibly preceded by a star. func scanChunk(pattern string) (star bool, chunk, rest string) { for len(pattern) > 0 && pattern[0] == '*' { pattern = pattern[1:] star = true } inrange := false var i int Scan: for i = 0; i < len(pattern); i++ { switch pattern[i] { case '\\': if runtime.GOOS != "windows" { // error check handled in matchChunk: bad pattern. if i+1 < len(pattern) { i++ } } case '[': inrange = true case ']': inrange = false case '*': if !inrange { break Scan } } } return star, pattern[0:i], pattern[i:] } // matchChunk checks whether chunk matches the beginning of s. // If so, it returns the remainder of s (after the match). // Chunk is all single-character operators: literals, char classes, and ?. func matchChunk(chunk, s string) (rest string, ok bool, err error) { // failed records whether the match has failed. // After the match fails, the loop continues on processing chunk, // checking that the pattern is well-formed but no longer reading s. failed := false for len(chunk) > 0 { if !failed && len(s) == 0 { failed = true } switch chunk[0] { case '[': // character class var r rune if !failed { var n int r, n = utf8.DecodeRuneInString(s) s = s[n:] } chunk = chunk[1:] // possibly negated negated := false if len(chunk) > 0 && chunk[0] == '^' { negated = true chunk = chunk[1:] } // parse all ranges match := false nrange := 0 for { if len(chunk) > 0 && chunk[0] == ']' && nrange > 0 { chunk = chunk[1:] break } var lo, hi rune if lo, chunk, err = getEsc(chunk); err != nil { return "", false, err } hi = lo if chunk[0] == '-' { if hi, chunk, err = getEsc(chunk[1:]); err != nil { return "", false, err } } if lo <= r && r <= hi { match = true } nrange++ } if match == negated { failed = true } case '?': if !failed { if s[0] == Separator { failed = true } _, n := utf8.DecodeRuneInString(s) s = s[n:] } chunk = chunk[1:] case '\\': if runtime.GOOS != "windows" { chunk = chunk[1:] if len(chunk) == 0 { return "", false, ErrBadPattern } } fallthrough default: if !failed { if chunk[0] != s[0] { failed = true } s = s[1:] } chunk = chunk[1:] } } if failed { return "", false, nil } return s, true, nil } // getEsc gets a possibly-escaped character from chunk, for a character class. func getEsc(chunk string) (r rune, nchunk string, err error) { if len(chunk) == 0 || chunk[0] == '-' || chunk[0] == ']' { err = ErrBadPattern return } if chunk[0] == '\\' && runtime.GOOS != "windows" { chunk = chunk[1:] if len(chunk) == 0 { err = ErrBadPattern return } } r, n := utf8.DecodeRuneInString(chunk) if r == utf8.RuneError && n == 1 { err = ErrBadPattern } nchunk = chunk[n:] if len(nchunk) == 0 { err = ErrBadPattern } return } // Glob returns the names of all files matching pattern or nil // if there is no matching file. The syntax of patterns is the same // as in [Match]. The pattern may describe hierarchical names such as // /usr/*/bin/ed (assuming the [Separator] is '/'). // // Glob ignores file system errors such as I/O errors reading directories. // The only possible returned error is [ErrBadPattern], when pattern // is malformed. func Glob(pattern string) (matches []string, err error) { return globWithLimit(pattern, 0) } func globWithLimit(pattern string, depth int) (matches []string, err error) { // This limit is used prevent stack exhaustion issues. See CVE-2022-30632. const pathSeparatorsLimit = 10000 if depth == pathSeparatorsLimit { return nil, ErrBadPattern } // Check pattern is well-formed. if _, err := Match(pattern, ""); err != nil { return nil, err } if !hasMeta(pattern) { if _, err = os.Lstat(pattern); err != nil { return nil, nil } return []string{pattern}, nil } dir, file := Split(pattern) volumeLen := 0 if runtime.GOOS == "windows" { volumeLen, dir = cleanGlobPathWindows(dir) } else { dir = cleanGlobPath(dir) } if !hasMeta(dir[volumeLen:]) { return glob(dir, file, nil) } // Prevent infinite recursion. See issue 15879. if dir == pattern { return nil, ErrBadPattern } var m []string m, err = globWithLimit(dir, depth+1) if err != nil { return } for _, d := range m { matches, err = glob(d, file, matches) if err != nil { return } } return } // cleanGlobPath prepares path for glob matching. func cleanGlobPath(path string) string { switch path { case "": return "." case string(Separator): // do nothing to the path return path default: return path[0 : len(path)-1] // chop off trailing separator } } // cleanGlobPathWindows is windows version of cleanGlobPath. func cleanGlobPathWindows(path string) (prefixLen int, cleaned string) { vollen := volumeNameLen(path) switch { case path == "": return 0, "." case vollen+1 == len(path) && os.IsPathSeparator(path[len(path)-1]): // /, \, C:\ and C:/ // do nothing to the path return vollen + 1, path case vollen == len(path) && len(path) == 2: // C: return vollen, path + "." // convert C: into C:. default: if vollen >= len(path) { vollen = len(path) - 1 } return vollen, path[0 : len(path)-1] // chop off trailing separator } } // glob searches for files matching pattern in the directory dir // and appends them to matches. If the directory cannot be // opened, it returns the existing matches. New matches are // added in lexicographical order. func glob(dir, pattern string, matches []string) (m []string, e error) { m = matches fi, err := os.Stat(dir) if err != nil { return // ignore I/O error } if !fi.IsDir() { return // ignore I/O error } d, err := os.Open(dir) if err != nil { return // ignore I/O error } defer d.Close() names, _ := d.Readdirnames(-1) sort.Strings(names) for _, n := range names { matched, err := Match(pattern, n) if err != nil { return m, err } if matched { m = append(m, Join(dir, n)) } } return } // hasMeta reports whether path contains any of the magic characters // recognized by Match. func hasMeta(path string) bool { magicChars := `*?[` if runtime.GOOS != "windows" { magicChars = `*?[\` } return strings.ContainsAny(path, magicChars) }