Squashed 'third_party/git/' content from commit cb71568594

git-subtree-dir: third_party/git
git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7

1 files changed, 278 insertions, 0 deletions

diff --git a/wildmatch.c b/wildmatch.c
new file mode 100644
index 000000000000..9e9e2a2f955d
--- /dev/null
+++ b/wildmatch.c
@@ -0,0 +1,278 @@
+/*
+**  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.
+*/
+
+#include "cache.h"
+#include "wildmatch.h"
+
+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);
+}