wildmatch: import wildmatch from git.git

In commit 70a8fc999d (stop using fnmatch (either native or
compat), 2014-02-15), upstream git has switched over all code
from their internal fnmatch copy to its new wildmatch code. We
haven't followed suit, and thus have developed some
incompatibilities in how we match regular expressions.

Import git's wildmatch from v2.22.0 and add a test suite based on
their t3070-wildmatch.sh tests.

COPYING

@@ -991,3 +991,31 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
+
+----------------------------------------------------------------------
+
+The bundled wildmatch code is licensed under the BSD license:
+
+Copyright Rich Salz.
+All rights reserved.
+
+Redistribution and use in any form are permitted provided that the
+following restrictions are are met:
+
+1.  Source distributions must retain this entire copyright notice
+    and comment.
+2.  Binary distributions must include the acknowledgement ``This
+    product includes software developed by Rich Salz'' in the
+    documentation or other materials provided with the
+    distribution.  This must not be represented as an endorsement
+   or promotion without specific prior written permission.
+3.  The origin of this software must not be misrepresented, either
+    by explicit claim or by omission.  Credits must appear in the
+    source and documentation.
+4.  Altered versions must be plainly marked as such in the source
+    and documentation and must not be misrepresented as being the
+    original software.
+
+THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

src/wildmatch.c

+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ *
+ * Do shell-style pattern matching for ?, \, [], and * characters.
+ * It is 8bit clean.
+ *
+ * Written by Rich $alz, mirror!rs, Wed Nov 26 19:03:17 EST 1986.
+ * Rich $alz is now <rsalz@bbn.com>.
+ *
+ * Modified by Wayne Davison to special-case '/' matching, to make '**'
+ * work differently than '*', and to fix the character-class code.
+ *
+ * Imported from git.git.
+ */
+
+#include "wildmatch.h"
+
+#define GIT_SPACE 0x01
+#define GIT_DIGIT 0x02
+#define GIT_ALPHA 0x04
+#define GIT_GLOB_SPECIAL 0x08
+#define GIT_REGEX_SPECIAL 0x10
+#define GIT_PATHSPEC_MAGIC 0x20
+#define GIT_CNTRL 0x40
+#define GIT_PUNCT 0x80
+
+enum {
+	S = GIT_SPACE,
+	A = GIT_ALPHA,
+	D = GIT_DIGIT,
+	G = GIT_GLOB_SPECIAL,	/* *, ?, [, \\ */
+	R = GIT_REGEX_SPECIAL,	/* $, (, ), +, ., ^, {, | */
+	P = GIT_PATHSPEC_MAGIC, /* other non-alnum, except for ] and } */
+	X = GIT_CNTRL,
+	U = GIT_PUNCT,
+	Z = GIT_CNTRL | GIT_SPACE
+};
+
+static const unsigned char sane_ctype[256] = {
+	X, X, X, X, X, X, X, X, X, Z, Z, X, X, Z, X, X,		/*   0.. 15 */
+	X, X, X, X, X, X, X, X, X, X, X, X, X, X, X, X,		/*  16.. 31 */
+	S, P, P, P, R, P, P, P, R, R, G, R, P, P, R, P,		/*  32.. 47 */
+	D, D, D, D, D, D, D, D, D, D, P, P, P, P, P, G,		/*  48.. 63 */
+	P, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A,		/*  64.. 79 */
+	A, A, A, A, A, A, A, A, A, A, A, G, G, U, R, P,		/*  80.. 95 */
+	P, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A,		/*  96..111 */
+	A, A, A, A, A, A, A, A, A, A, A, R, R, U, P, X,		/* 112..127 */
+	/* Nothing in the 128.. range */
+};
+
+#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
+#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
+
+typedef unsigned char uchar;
+
+/* What character marks an inverted character class? */
+#define NEGATE_CLASS	'!'
+#define NEGATE_CLASS2	'^'
+
+#define CC_EQ(class, len, litmatch) ((len) == sizeof (litmatch)-1 \
+				    && *(class) == *(litmatch) \
+				    && strncmp((char*)class, litmatch, len) == 0)
+
+#if defined STDC_HEADERS || !defined isascii
+# define ISASCII(c) 1
+#else
+# define ISASCII(c) isascii(c)
+#endif
+
+#ifdef isblank
+# define ISBLANK(c) (ISASCII(c) && isblank(c))
+#else
+# define ISBLANK(c) ((c) == ' ' || (c) == '\t')
+#endif
+
+#ifdef isgraph
+# define ISGRAPH(c) (ISASCII(c) && isgraph(c))
+#else
+# define ISGRAPH(c) (ISASCII(c) && isprint(c) && !isspace(c))
+#endif
+
+#define ISPRINT(c) (ISASCII(c) && isprint(c))
+#define ISDIGIT(c) (ISASCII(c) && isdigit(c))
+#define ISALNUM(c) (ISASCII(c) && isalnum(c))
+#define ISALPHA(c) (ISASCII(c) && isalpha(c))
+#define ISCNTRL(c) (ISASCII(c) && iscntrl(c))
+#define ISLOWER(c) (ISASCII(c) && islower(c))
+#define ISPUNCT(c) (ISASCII(c) && ispunct(c))
+#define ISSPACE(c) (ISASCII(c) && isspace(c))
+#define ISUPPER(c) (ISASCII(c) && isupper(c))
+#define ISXDIGIT(c) (ISASCII(c) && isxdigit(c))
+
+/* Match pattern "p" against "text" */
+static int dowild(const uchar *p, const uchar *text, unsigned int flags)
+{
+	uchar p_ch;
+	const uchar *pattern = p;
+
+	for ( ; (p_ch = *p) != '\0'; text++, p++) {
+		int matched, match_slash, negated;
+		uchar t_ch, prev_ch;
+		if ((t_ch = *text) == '\0' && p_ch != '*')
+			return WM_ABORT_ALL;
+		if ((flags & WM_CASEFOLD) && ISUPPER(t_ch))
+			t_ch = tolower(t_ch);
+		if ((flags & WM_CASEFOLD) && ISUPPER(p_ch))
+			p_ch = tolower(p_ch);
+		switch (p_ch) {
+		case '\\':
+			/* Literal match with following character.  Note that the test
+			 * in "default" handles the p[1] == '\0' failure case. */
+			p_ch = *++p;
+			/* FALLTHROUGH */
+		default:
+			if (t_ch != p_ch)
+				return WM_NOMATCH;
+			continue;
+		case '?':
+			/* Match anything but '/'. */
+			if ((flags & WM_PATHNAME) && t_ch == '/')
+				return WM_NOMATCH;
+			continue;
+		case '*':
+			if (*++p == '*') {
+				const uchar *prev_p = p - 2;
+				while (*++p == '*') {}
+				if (!(flags & WM_PATHNAME))
+					/* without WM_PATHNAME, '*' == '**' */
+					match_slash = 1;
+				else if ((prev_p < pattern || *prev_p == '/') &&
+				    (*p == '\0' || *p == '/' ||
+				     (p[0] == '\\' && p[1] == '/'))) {
+					/*
+					 * Assuming we already match 'foo/' and are at
+					 * <star star slash>, just assume it matches
+					 * nothing and go ahead match the rest of the
+					 * pattern with the remaining string. This
+					 * helps make foo/<*><*>/bar (<> because
+					 * otherwise it breaks C comment syntax) match
+					 * both foo/bar and foo/a/bar.
+					 */
+					if (p[0] == '/' &&
+					    dowild(p + 1, text, flags) == WM_MATCH)
+						return WM_MATCH;
+					match_slash = 1;
+				} else /* WM_PATHNAME is set */
+					match_slash = 0;
+			} else
+				/* without WM_PATHNAME, '*' == '**' */
+				match_slash = flags & WM_PATHNAME ? 0 : 1;
+			if (*p == '\0') {
+				/* Trailing "**" matches everything.  Trailing "*" matches
+				 * only if there are no more slash characters. */
+				if (!match_slash) {
+					if (strchr((char*)text, '/') != NULL)
+						return WM_NOMATCH;
+				}
+				return WM_MATCH;
+			} else if (!match_slash && *p == '/') {
+				/*
+				 * _one_ asterisk followed by a slash
+				 * with WM_PATHNAME matches the next
+				 * directory
+				 */
+				const char *slash = strchr((char*)text, '/');
+				if (!slash)
+					return WM_NOMATCH;
+				text = (const uchar*)slash;
+				/* the slash is consumed by the top-level for loop */
+				break;
+			}
+			while (1) {
+				if (t_ch == '\0')
+					break;
+				/*
+				 * Try to advance faster when an asterisk is
+				 * followed by a literal. We know in this case
+				 * that the string before the literal
+				 * must belong to "*".
+				 * If match_slash is false, do not look past
+				 * the first slash as it cannot belong to '*'.
+				 */
+				if (!is_glob_special(*p)) {
+					p_ch = *p;
+					if ((flags & WM_CASEFOLD) && ISUPPER(p_ch))
+						p_ch = tolower(p_ch);
+					while ((t_ch = *text) != '\0' &&
+					       (match_slash || t_ch != '/')) {
+						if ((flags & WM_CASEFOLD) && ISUPPER(t_ch))
+							t_ch = tolower(t_ch);
+						if (t_ch == p_ch)
+							break;
+						text++;
+					}
+					if (t_ch != p_ch)
+						return WM_NOMATCH;
+				}
+				if ((matched = dowild(p, text, flags)) != WM_NOMATCH) {
+					if (!match_slash || matched != WM_ABORT_TO_STARSTAR)
+						return matched;
+				} else if (!match_slash && t_ch == '/')
+					return WM_ABORT_TO_STARSTAR;
+				t_ch = *++text;
+			}
+			return WM_ABORT_ALL;
+		case '[':
+			p_ch = *++p;
+#ifdef NEGATE_CLASS2
+			if (p_ch == NEGATE_CLASS2)
+				p_ch = NEGATE_CLASS;
+#endif
+			/* Assign literal 1/0 because of "matched" comparison. */
+			negated = p_ch == NEGATE_CLASS ? 1 : 0;
+			if (negated) {
+				/* Inverted character class. */
+				p_ch = *++p;
+			}
+			prev_ch = 0;
+			matched = 0;
+			do {
+				if (!p_ch)
+					return WM_ABORT_ALL;
+				if (p_ch == '\\') {
+					p_ch = *++p;
+					if (!p_ch)
+						return WM_ABORT_ALL;
+					if (t_ch == p_ch)
+						matched = 1;
+				} else if (p_ch == '-' && prev_ch && p[1] && p[1] != ']') {
+					p_ch = *++p;
+					if (p_ch == '\\') {
+						p_ch = *++p;
+						if (!p_ch)
+							return WM_ABORT_ALL;
+					}
+					if (t_ch <= p_ch && t_ch >= prev_ch)
+						matched = 1;
+					else if ((flags & WM_CASEFOLD) && ISLOWER(t_ch)) {
+						uchar t_ch_upper = toupper(t_ch);
+						if (t_ch_upper <= p_ch && t_ch_upper >= prev_ch)
+							matched = 1;
+					}
+					p_ch = 0; /* This makes "prev_ch" get set to 0. */
+				} else if (p_ch == '[' && p[1] == ':') {
+					const uchar *s;
+					int i;
+					for (s = p += 2; (p_ch = *p) && p_ch != ']'; p++) {} /*SHARED ITERATOR*/
+					if (!p_ch)
+						return WM_ABORT_ALL;
+					i = p - s - 1;
+					if (i < 0 || p[-1] != ':') {
+						/* Didn't find ":]", so treat like a normal set. */
+						p = s - 2;
+						p_ch = '[';
+						if (t_ch == p_ch)
+							matched = 1;
+						continue;
+					}
+					if (CC_EQ(s,i, "alnum")) {
+						if (ISALNUM(t_ch))
+							matched = 1;
+					} else if (CC_EQ(s,i, "alpha")) {
+						if (ISALPHA(t_ch))
+							matched = 1;
+					} else if (CC_EQ(s,i, "blank")) {
+						if (ISBLANK(t_ch))
+							matched = 1;
+					} else if (CC_EQ(s,i, "cntrl")) {
+						if (ISCNTRL(t_ch))
+							matched = 1;
+					} else if (CC_EQ(s,i, "digit")) {
+						if (ISDIGIT(t_ch))
+							matched = 1;
+					} else if (CC_EQ(s,i, "graph")) {
+						if (ISGRAPH(t_ch))
+							matched = 1;
+					} else if (CC_EQ(s,i, "lower")) {
+						if (ISLOWER(t_ch))
+							matched = 1;
+					} else if (CC_EQ(s,i, "print")) {
+						if (ISPRINT(t_ch))
+							matched = 1;
+					} else if (CC_EQ(s,i, "punct")) {
+						if (ISPUNCT(t_ch))
+							matched = 1;
+					} else if (CC_EQ(s,i, "space")) {
+						if (ISSPACE(t_ch))
+							matched = 1;
+					} else if (CC_EQ(s,i, "upper")) {
+						if (ISUPPER(t_ch))
+							matched = 1;
+						else if ((flags & WM_CASEFOLD) && ISLOWER(t_ch))
+							matched = 1;
+					} else if (CC_EQ(s,i, "xdigit")) {
+						if (ISXDIGIT(t_ch))
+							matched = 1;
+					} else /* malformed [:class:] string */
+						return WM_ABORT_ALL;
+					p_ch = 0; /* This makes "prev_ch" get set to 0. */
+				} else if (t_ch == p_ch)
+					matched = 1;
+			} while (prev_ch = p_ch, (p_ch = *++p) != ']');
+			if (matched == negated ||
+			    ((flags & WM_PATHNAME) && t_ch == '/'))
+				return WM_NOMATCH;
+			continue;
+		}
+	}
+
+	return *text ? WM_NOMATCH : WM_MATCH;
+}
+
+/* Match the "pattern" against the "text" string. */
+int wildmatch(const char *pattern, const char *text, unsigned int flags)
+{
+	return dowild((const uchar*)pattern, (const uchar*)text, flags);
+}

src/wildmatch.h

+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#ifndef INCLUDE_wildmatch_h__
+#define INCLUDE_wildmatch_h__
+
+#include "common.h"
+
+#define WM_CASEFOLD 1
+#define WM_PATHNAME 2
+
+#define WM_NOMATCH 1
+#define WM_MATCH 0
+#define WM_ABORT_ALL -1
+#define WM_ABORT_TO_STARSTAR -2
+
+int wildmatch(const char *pattern, const char *text, unsigned int flags);
+
+#endif