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Posted to commits@apr.apache.org by wr...@apache.org on 2011/05/01 01:36:00 UTC
svn commit: r1098188 - /apr/apr/branches/1.4.x/strings/apr_fnmatch.c
Author: wrowe
Date: Sat Apr 30 23:35:59 2011
New Revision: 1098188
URL: http://svn.apache.org/viewvc?rev=1098188&view=rev
Log:
Introduce new apr_fnmatch implementation.
Delivers substantial optimizations in some common cases, without
the underlying weakness of recursion present in other implementations.
Modified:
apr/apr/branches/1.4.x/strings/apr_fnmatch.c
Modified: apr/apr/branches/1.4.x/strings/apr_fnmatch.c
URL: http://svn.apache.org/viewvc/apr/apr/branches/1.4.x/strings/apr_fnmatch.c?rev=1098188&r1=1098187&r2=1098188&view=diff
==============================================================================
--- apr/apr/branches/1.4.x/strings/apr_fnmatch.c (original)
+++ apr/apr/branches/1.4.x/strings/apr_fnmatch.c Sat Apr 30 23:35:59 2011
@@ -14,9 +14,50 @@
* limitations under the License.
*/
-#ifndef WIN32
-#include "apr_private.h"
-#endif
+
+/* apr_fnmatch() and fnmatch_ch()
+ * Copyright (c) 2011, VMware, Inc.
+ *
+ * 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').
+ *
+ * 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 "apr_file_info.h"
#include "apr_fnmatch.h"
#include "apr_tables.h"
@@ -27,6 +68,313 @@
# include <ctype.h>
#endif
+
+/* 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 __inline int fnmatch_ch(const char **pattern, const char **string, int flags)
+{
+ const char * const mismatch = *pattern;
+ const int nocase = !!(flags & APR_FNM_CASE_BLIND);
+ const int escape = !(flags & APR_FNM_NOESCAPE);
+ const int slash = !!(flags & APR_FNM_PATHNAME);
+ int result = APR_FNM_NOMATCH;
+ const char *startch;
+ int negate;
+
+ if (**pattern == '[')
+ {
+ ++*pattern;
+
+ /* Handle negation, either leading ! or ^ operators (never both) */
+ negate = ((**pattern == '!') || (**pattern == '^'));
+ if (negate)
+ ++*pattern;
+
+ while (**pattern)
+ {
+ /* ']' is an ordinary character at the start of the range pattern */
+ if ((**pattern == ']') && (*pattern > mismatch)) {
+ ++*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;
+
+ /* Look at only well-formed range patterns; ']' is allowed only if escaped,
+ * while '/' is not allowed at all in FNM_PATHNAME mode.
+ */
+ /* XXX: Fix for locale/MBCS character width */
+ if (((*pattern)[1] == '-') && (*pattern)[2]
+ && ((escape && ((*pattern)[2] != '\\'))
+ ? (((*pattern)[2] != ']') && (!slash || ((*pattern)[2] != '/')))
+ : (((*pattern)[3]) && (!slash || ((*pattern)[3] != '/'))))) {
+ startch = *pattern;
+ *pattern += (escape && ((*pattern)[2] == '\\')) ? 3 : 2;
+
+ /* 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 to test '[' literal */
+ *pattern = mismatch;
+ result = APR_FNM_NOMATCH;
+ }
+ else if (**pattern == '?') {
+ /* Optimize '?' match before unescaping **pattern */
+ if (!**string || (!slash || (**string != '/')))
+ return APR_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;
+}
+
+
+APR_DECLARE(int) apr_fnmatch(const char *pattern, const char *string, int flags)
+{
+ static const char dummystring[2] = {' ', 0};
+ const int escape = !(flags & APR_FNM_NOESCAPE);
+ const int slash = !!(flags & APR_FNM_PATHNAME);
+ 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;
+
+ while (*pattern)
+ {
+ /* Match balanced slashes, starting a new segment pattern
+ */
+ if (slash && escape && (*pattern == '\\') && (pattern[1] == '/'))
+ ++pattern;
+ if (slash && (*pattern == '/') && (*string == '/')) {
+ ++pattern;
+ ++string;
+ }
+
+ /* At the beginning of each segment, validate leading period behavior.
+ */
+ if ((flags & APR_FNM_PERIOD) && (*string == '.'))
+ {
+ if (*pattern == '.')
+ ++pattern;
+ else if (escape && (*pattern == '\\') && (pattern[1] == '.'))
+ pattern += 2;
+ else
+ return APR_FNM_NOMATCH;
+ ++string;
+ }
+
+ /* Determine the end of string segment
+ *
+ * Presumes '/' character is unique, not composite in any MBCS encoding
+ */
+ if (slash) {
+ if (!(strendseg = strchr(string, '/')))
+ strendseg = strchr(string, '\0');
+ }
+ else {
+ strendseg = strchr(string, '\0');
+ }
+
+ /* Allow pattern '*' to be consumed even with no remaining string to match
+ */
+ while (*pattern && !(slash && ((*pattern == '/')
+ || (escape && (*pattern == '\\')
+ && (pattern[1] == '/'))))
+ && ((string < strendseg)
+ || ((*pattern == '*') && (string == strendseg))))
+ {
+ /* 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 APR_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 APR_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 APR_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 APR_FNM_NOMATCH;
+
+ pattern = mismatch;
+ continue;
+ }
+ else
+ return APR_FNM_NOMATCH;
+ }
+ }
+
+ if (*string && (!slash || (*string != '/')))
+ return APR_FNM_NOMATCH;
+
+ if (*pattern && (!slash || ((*pattern != '/')
+ && (!escape || (*pattern != '\\')
+ || (pattern[1] != '/')))))
+ return APR_FNM_NOMATCH;
+ }
+
+ /* pattern is at EOS; if string is also, declare success
+ */
+ if (!*string)
+ return 0;
+
+ /* pattern didn't match to the end of string */
+ return APR_FNM_NOMATCH;
+}
+
+
/* This function is an Apache addition
* return non-zero if pattern has any glob chars in it
* @bug Function does not distinguish for FNM_PATHNAME mode, which renders