diff options
| -rw-r--r-- | lib/libc/gen/fnmatch.c | 667 |
1 files changed, 435 insertions, 232 deletions
diff --git a/lib/libc/gen/fnmatch.c b/lib/libc/gen/fnmatch.c index a005013aab6..c3d1a3ccf5e 100644 --- a/lib/libc/gen/fnmatch.c +++ b/lib/libc/gen/fnmatch.c @@ -1,249 +1,101 @@ -/* $OpenBSD: fnmatch.c,v 1.15 2011/02/10 21:31:59 stsp Exp $ */ +/* $OpenBSD: fnmatch.c,v 1.16 2011/12/06 11:47:46 stsp Exp $ */ -/* - * Copyright (c) 1989, 1993, 1994 - * The Regents of the University of California. All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Guido van Rossum. - * +/* Copyright (c) 2011, VMware, Inc. + * All rights reserved. + * * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * modification, are permitted provided that the following conditions are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * * Neither the name of the VMware, Inc. nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. + * ARE DISCLAIMED. IN NO EVENT SHALL VMWARE, INC. OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* - * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6. - * Compares a filename or pathname to a pattern. + * Copyright (c) 2008 Todd C. Miller <millert@openbsd.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* Authored by William A. Rowe Jr. <wrowe; apache.org, vmware.com>, April 2011 + * + * Derived from The Open Group Base Specifications Issue 7, IEEE Std 1003.1-2008 + * as described in; + * http://pubs.opengroup.org/onlinepubs/9699919799/functions/fnmatch.html + * + * Filename pattern matches defined in section 2.13, "Pattern Matching Notation" + * from chapter 2. "Shell Command Language" + * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_13 + * where; 1. A bracket expression starting with an unquoted <circumflex> '^' + * character CONTINUES to specify a non-matching list; 2. an explicit <period> '.' + * in a bracket expression matching list, e.g. "[.abc]" does NOT match a leading + * <period> in a filename; 3. a <left-square-bracket> '[' which does not introduce + * a valid bracket expression is treated as an ordinary character; 4. a differing + * number of consecutive slashes within pattern and string will NOT match; + * 5. a trailing '\' in FNM_ESCAPE mode is treated as an ordinary '\' character. + * + * Bracket expansion defined in section 9.3.5, "RE Bracket Expression", + * from chapter 9, "Regular Expressions" + * http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_03_05 + * with no support for collating symbols, equivalence class expressions or + * character class expressions. A partial range expression with a leading + * hyphen following a valid range expression will match only the ordinary + * <hyphen> and the ending character (e.g. "[a-m-z]" will match characters + * 'a' through 'm', a <hyphen> '-', or a 'z'). + * + * Supports BSD extensions FNM_LEADING_DIR to match pattern to the end of one + * path segment of string, and FNM_CASEFOLD to ignore alpha case. + * + * NOTE: Only POSIX/C single byte locales are correctly supported at this time. + * Notably, non-POSIX locales with FNM_CASEFOLD produce undefined results, + * particularly in ranges of mixed case (e.g. "[A-z]") or spanning alpha and + * nonalpha characters within a range. + * + * XXX comments below indicate porting required for multi-byte character sets + * and non-POSIX locale collation orders; requires mbr* APIs to track shift + * state of pattern and string (rewinding pattern and string repeatedly). + * + * Certain parts of the code assume 0x00-0x3F are unique with any MBCS (e.g. + * UTF-8, SHIFT-JIS, etc). Any implementation allowing '\' as an alternate + * path delimiter must be aware that 0x5C is NOT unique within SHIFT-JIS. */ -#include <ctype.h> -#include <stdio.h> -#include <string.h> #include <fnmatch.h> +#include <string.h> +#include <ctype.h> #include <limits.h> #include "charclass.h" -#define EOS '\0' - #define RANGE_MATCH 1 #define RANGE_NOMATCH 0 #define RANGE_ERROR (-1) -/* Limit of recursion during matching attempts. */ -#define __FNM_MAX_RECUR 64 - -static int rangematch(const char *, char, int, char **); -static int classmatch(const char *, char, int, const char **); -static int __fnmatch(const char *, const char *, int, int); - -int -fnmatch(const char *pattern, const char *string, int flags) -{ - int e; - - if (strnlen(pattern, PATH_MAX) == PATH_MAX || - strnlen(string, PATH_MAX) == PATH_MAX) - return (FNM_NOMATCH); - - e = __fnmatch(pattern, string, flags, __FNM_MAX_RECUR); - if (e == -1) - e = FNM_NOMATCH; - return (e); -} - -static int -__fnmatch(const char *pattern, const char *string, int flags, int recur) -{ - const char *stringstart; - char *newp; - char c, test; - int e; - - if (recur-- == 0) - return (-1); - - for (stringstart = string;;) - switch (c = *pattern++) { - case EOS: - if ((flags & FNM_LEADING_DIR) && *string == '/') - return (0); - return (*string == EOS ? 0 : FNM_NOMATCH); - case '?': - if (*string == EOS) - return (FNM_NOMATCH); - if (*string == '/' && (flags & FNM_PATHNAME)) - return (FNM_NOMATCH); - if (*string == '.' && (flags & FNM_PERIOD) && - (string == stringstart || - ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) - return (FNM_NOMATCH); - ++string; - break; - case '*': - c = *pattern; - /* Collapse multiple stars. */ - while (c == '*') - c = *++pattern; - - if (*string == '.' && (flags & FNM_PERIOD) && - (string == stringstart || - ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) - return (FNM_NOMATCH); - - /* Optimize for pattern with * at end or before /. */ - if (c == EOS) { - if (flags & FNM_PATHNAME) - return ((flags & FNM_LEADING_DIR) || - strchr(string, '/') == NULL ? - 0 : FNM_NOMATCH); - else - return (0); - } else if (c == '/' && (flags & FNM_PATHNAME)) { - if ((string = strchr(string, '/')) == NULL) - return (FNM_NOMATCH); - break; - } - - /* General case, use recursion. */ - while ((test = *string) != EOS) { - e = __fnmatch(pattern, string, - flags & ~FNM_PERIOD, recur); - if (e != FNM_NOMATCH) - return (e); - if (test == '/' && (flags & FNM_PATHNAME)) - break; - ++string; - } - return (FNM_NOMATCH); - case '[': - if (*string == EOS) - return (FNM_NOMATCH); - if (*string == '/' && (flags & FNM_PATHNAME)) - return (FNM_NOMATCH); - if (*string == '.' && (flags & FNM_PERIOD) && - (string == stringstart || - ((flags & FNM_PATHNAME) && *(string - 1) == '/'))) - return (FNM_NOMATCH); - - switch (rangematch(pattern, *string, flags, &newp)) { - case RANGE_ERROR: - /* not a good range, treat as normal text */ - goto normal; - case RANGE_MATCH: - pattern = newp; - break; - case RANGE_NOMATCH: - return (FNM_NOMATCH); - } - ++string; - break; - case '\\': - if (!(flags & FNM_NOESCAPE)) { - if ((c = *pattern++) == EOS) { - c = '\\'; - --pattern; - } - } - /* FALLTHROUGH */ - default: - normal: - if (c != *string && !((flags & FNM_CASEFOLD) && - (tolower((unsigned char)c) == - tolower((unsigned char)*string)))) - return (FNM_NOMATCH); - ++string; - break; - } - /* NOTREACHED */ -} - -static int -rangematch(const char *pattern, char test, int flags, char **newp) -{ - int negate, ok, rv; - char c, c2; - - /* - * A bracket expression starting with an unquoted circumflex - * character produces unspecified results (IEEE 1003.2-1992, - * 3.13.2). This implementation treats it like '!', for - * consistency with the regular expression syntax. - * J.T. Conklin (conklin@ngai.kaleida.com) - */ - if ((negate = (*pattern == '!' || *pattern == '^'))) - ++pattern; - - if (flags & FNM_CASEFOLD) - test = (char)tolower((unsigned char)test); - - /* - * A right bracket shall lose its special meaning and represent - * itself in a bracket expression if it occurs first in the list. - * -- POSIX.2 2.8.3.2 - */ - ok = 0; - c = *pattern++; - do { - if (c == '[' && *pattern == ':') { - do { - rv = classmatch(pattern + 1, test, - (flags & FNM_CASEFOLD), &pattern); - if (rv == RANGE_MATCH) - ok = 1; - c = *pattern++; - } while (rv != RANGE_ERROR && c == '[' && *pattern == ':'); - if (c == ']') - break; - } - if (c == '\\' && !(flags & FNM_NOESCAPE)) - c = *pattern++; - if (c == EOS) - return (RANGE_ERROR); - if (c == '/' && (flags & FNM_PATHNAME)) - return (RANGE_NOMATCH); - if ((flags & FNM_CASEFOLD)) - c = (char)tolower((unsigned char)c); - if (*pattern == '-' - && (c2 = *(pattern+1)) != EOS && c2 != ']') { - pattern += 2; - if (c2 == '\\' && !(flags & FNM_NOESCAPE)) - c2 = *pattern++; - if (c2 == EOS) - return (RANGE_ERROR); - if (flags & FNM_CASEFOLD) - c2 = (char)tolower((unsigned char)c2); - if (c <= test && test <= c2) - ok = 1; - } else if (c == test) - ok = 1; - } while ((c = *pattern++) != ']'); - - *newp = (char *)pattern; - return (ok == negate ? RANGE_NOMATCH : RANGE_MATCH); -} - static int classmatch(const char *pattern, char test, int foldcase, const char **ep) { @@ -251,9 +103,17 @@ classmatch(const char *pattern, char test, int foldcase, const char **ep) const char *colon; size_t len; int rval = RANGE_NOMATCH; + const char * const mismatch = pattern; + + if (*pattern != '[' || pattern[1] != ':') { + *ep = mismatch; + return(RANGE_ERROR); + } + + pattern += 2; if ((colon = strchr(pattern, ':')) == NULL || colon[1] != ']') { - *ep = pattern - 2; + *ep = mismatch; return(RANGE_ERROR); } *ep = colon + 2; @@ -269,9 +129,352 @@ classmatch(const char *pattern, char test, int foldcase, const char **ep) } } if (cc->name == NULL) { - /* invalid character class, return EOS */ - *ep = colon + strlen(colon); + /* invalid character class, treat as normal text */ + *ep = mismatch; rval = RANGE_ERROR; } return(rval); } + +/* Most MBCS/collation/case issues handled here. Wildcard '*' is not handled. + * EOS '\0' and the FNM_PATHNAME '/' delimiters are not advanced over, + * however the "\/" sequence is advanced to '/'. + * + * Both pattern and string are **char to support pointer increment of arbitrary + * multibyte characters for the given locale, in a later iteration of this code + */ +static int fnmatch_ch(const char **pattern, const char **string, int flags) +{ + const char * const mismatch = *pattern; + const int nocase = !!(flags & FNM_CASEFOLD); + const int escape = !(flags & FNM_NOESCAPE); + const int slash = !!(flags & FNM_PATHNAME); + int result = FNM_NOMATCH; + const char *startch; + int negate; + + if (**pattern == '[') + { + ++*pattern; + + /* Handle negation, either leading ! or ^ operators (never both) */ + negate = ((**pattern == '!') || (**pattern == '^')); + if (negate) + ++*pattern; + + /* ']' is an ordinary character at the start of the range pattern */ + if (**pattern == ']') + goto leadingclosebrace; + + while (**pattern) + { + if (**pattern == ']') { + ++*pattern; + /* XXX: Fix for MBCS character width */ + ++*string; + return (result ^ negate); + } + + if (escape && (**pattern == '\\')) { + ++*pattern; + + /* Patterns must be terminated with ']', not EOS */ + if (!**pattern) + break; + } + + /* Patterns must be terminated with ']' not '/' */ + if (slash && (**pattern == '/')) + break; + + /* Match character classes. */ + if (classmatch(*pattern, **string, nocase, pattern) + == RANGE_MATCH) { + result = 0; + continue; + } + +leadingclosebrace: + /* Look at only well-formed range patterns; + * "x-]" is not allowed unless escaped ("x-\]") + * XXX: Fix for locale/MBCS character width + */ + if (((*pattern)[1] == '-') && ((*pattern)[2] != ']')) + { + startch = *pattern; + *pattern += (escape && ((*pattern)[2] == '\\')) ? 3 : 2; + + /* NOT a properly balanced [expr] pattern, EOS terminated + * or ranges containing a slash in FNM_PATHNAME mode pattern + * fall out to to the rewind and test '[' literal code path + */ + if (!**pattern || (slash && (**pattern == '/'))) + break; + + /* XXX: handle locale/MBCS comparison, advance by MBCS char width */ + if ((**string >= *startch) && (**string <= **pattern)) + result = 0; + else if (nocase && (isupper(**string) || isupper(*startch) + || isupper(**pattern)) + && (tolower(**string) >= tolower(*startch)) + && (tolower(**string) <= tolower(**pattern))) + result = 0; + + ++*pattern; + continue; + } + + /* XXX: handle locale/MBCS comparison, advance by MBCS char width */ + if ((**string == **pattern)) + result = 0; + else if (nocase && (isupper(**string) || isupper(**pattern)) + && (tolower(**string) == tolower(**pattern))) + result = 0; + + ++*pattern; + } + + /* NOT a properly balanced [expr] pattern; Rewind + * and reset result to test '[' literal + */ + *pattern = mismatch; + result = FNM_NOMATCH; + } + else if (**pattern == '?') { + /* Optimize '?' match before unescaping **pattern */ + if (!**string || (slash && (**string == '/'))) + return FNM_NOMATCH; + result = 0; + goto fnmatch_ch_success; + } + else if (escape && (**pattern == '\\') && (*pattern)[1]) { + ++*pattern; + } + + /* XXX: handle locale/MBCS comparison, advance by the MBCS char width */ + if (**string == **pattern) + result = 0; + else if (nocase && (isupper(**string) || isupper(**pattern)) + && (tolower(**string) == tolower(**pattern))) + result = 0; + + /* Refuse to advance over trailing slash or nulls + */ + if (!**string || !**pattern || (slash && ((**string == '/') || (**pattern == '/')))) + return result; + +fnmatch_ch_success: + ++*pattern; + ++*string; + return result; +} + + +int fnmatch(const char *pattern, const char *string, int flags) +{ + static const char dummystring[2] = {' ', 0}; + const int escape = !(flags & FNM_NOESCAPE); + const int slash = !!(flags & FNM_PATHNAME); + const int leading_dir = !!(flags & FNM_LEADING_DIR); + const char *strendseg; + const char *dummyptr; + const char *matchptr; + int wild; + /* For '*' wild processing only; surpress 'used before initialization' + * warnings with dummy initialization values; + */ + const char *strstartseg = NULL; + const char *mismatch = NULL; + int matchlen = 0; + + if (strnlen(pattern, PATH_MAX) == PATH_MAX || + strnlen(string, PATH_MAX) == PATH_MAX) + return (FNM_NOMATCH); + + if (*pattern == '*') + goto firstsegment; + + while (*pattern && *string) + { + /* Pre-decode "\/" which has no special significance, and + * match balanced slashes, starting a new segment pattern + */ + if (slash && escape && (*pattern == '\\') && (pattern[1] == '/')) + ++pattern; + if (slash && (*pattern == '/') && (*string == '/')) { + ++pattern; + ++string; + } + +firstsegment: + /* At the beginning of each segment, validate leading period behavior. + */ + if ((flags & FNM_PERIOD) && (*string == '.')) + { + if (*pattern == '.') + ++pattern; + else if (escape && (*pattern == '\\') && (pattern[1] == '.')) + pattern += 2; + else + return FNM_NOMATCH; + ++string; + } + + /* Determine the end of string segment + * + * Presumes '/' character is unique, not composite in any MBCS encoding + */ + if (slash) { + strendseg = strchr(string, '/'); + if (!strendseg) + strendseg = strchr(string, '\0'); + } + else { + strendseg = strchr(string, '\0'); + } + + /* Allow pattern '*' to be consumed even with no remaining string to match + */ + while (*pattern) + { + if ((string > strendseg) + || ((string == strendseg) && (*pattern != '*'))) + break; + + if (slash && ((*pattern == '/') + || (escape && (*pattern == '\\') + && (pattern[1] == '/')))) + break; + + /* Reduce groups of '*' and '?' to n '?' matches + * followed by one '*' test for simplicity + */ + for (wild = 0; ((*pattern == '*') || (*pattern == '?')); ++pattern) + { + if (*pattern == '*') { + wild = 1; + } + else if (string < strendseg) { /* && (*pattern == '?') */ + /* XXX: Advance 1 char for MBCS locale */ + ++string; + } + else { /* (string >= strendseg) && (*pattern == '?') */ + return FNM_NOMATCH; + } + } + + if (wild) + { + strstartseg = string; + mismatch = pattern; + + /* Count fixed (non '*') char matches remaining in pattern + * excluding '/' (or "\/") and '*' + */ + for (matchptr = pattern, matchlen = 0; 1; ++matchlen) + { + if ((*matchptr == '\0') + || (slash && ((*matchptr == '/') + || (escape && (*matchptr == '\\') + && (matchptr[1] == '/'))))) + { + /* Compare precisely this many trailing string chars, + * the resulting match needs no wildcard loop + */ + /* XXX: Adjust for MBCS */ + if (string + matchlen > strendseg) + return FNM_NOMATCH; + + string = strendseg - matchlen; + wild = 0; + break; + } + + if (*matchptr == '*') + { + /* Ensure at least this many trailing string chars remain + * for the first comparison + */ + /* XXX: Adjust for MBCS */ + if (string + matchlen > strendseg) + return FNM_NOMATCH; + + /* Begin first wild comparison at the current position */ + break; + } + + /* Skip forward in pattern by a single character match + * Use a dummy fnmatch_ch() test to count one "[range]" escape + */ + /* XXX: Adjust for MBCS */ + if (escape && (*matchptr == '\\') && matchptr[1]) { + matchptr += 2; + } + else if (*matchptr == '[') { + dummyptr = dummystring; + fnmatch_ch(&matchptr, &dummyptr, flags); + } + else { + ++matchptr; + } + } + } + + /* Incrementally match string against the pattern + */ + while (*pattern && (string < strendseg)) + { + /* Success; begin a new wild pattern search + */ + if (*pattern == '*') + break; + + if (slash && ((*string == '/') + || (*pattern == '/') + || (escape && (*pattern == '\\') + && (pattern[1] == '/')))) + break; + + /* Compare ch's (the pattern is advanced over "\/" to the '/', + * but slashes will mismatch, and are not consumed) + */ + if (!fnmatch_ch(&pattern, &string, flags)) + continue; + + /* Failed to match, loop against next char offset of string segment + * until not enough string chars remain to match the fixed pattern + */ + if (wild) { + /* XXX: Advance 1 char for MBCS locale */ + string = ++strstartseg; + if (string + matchlen > strendseg) + return FNM_NOMATCH; + + pattern = mismatch; + continue; + } + else + return FNM_NOMATCH; + } + } + + if (*string && !((slash || leading_dir) && (*string == '/'))) + return FNM_NOMATCH; + + if (*pattern && !(slash && ((*pattern == '/') + || (escape && (*pattern == '\\') + && (pattern[1] == '/'))))) + return FNM_NOMATCH; + + if (leading_dir && !*pattern && *string == '/') + return 0; + } + + /* Where both pattern and string are at EOS, declare success + */ + if (!*string && !*pattern) + return 0; + + /* pattern didn't match to the end of string */ + return FNM_NOMATCH; +} |