Import wildmatch from rsync

These files are from rsync.git commit
f92f5b166e3019db42bc7fe1aa2f1a9178cd215d, which was the last commit
before rsync turned GPL-3. All files are imported as-is and
no-op. Adaptation is done in a separate patch.

rsync.git           ->  git.git
lib/wildmatch.[ch]      wildmatch.[ch]
wildtest.txt            t/t3070/wildtest.txt

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 368 insertions, 0 deletions

diff --git a/wildmatch.c b/wildmatch.c
new file mode 100644
index 0000000000..f3a1731eb0
--- /dev/null
+++ b/wildmatch.c
@@ -0,0 +1,368 @@
+/*
+**  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 "rsync.h"
+
+/* What character marks an inverted character class? */
+#define NEGATE_CLASS	'!'
+#define NEGATE_CLASS2	'^'
+
+#define FALSE 0
+#define TRUE 1
+#define ABORT_ALL -1
+#define ABORT_TO_STARSTAR -2
+
+#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))
+
+#ifdef WILD_TEST_ITERATIONS
+int wildmatch_iteration_count;
+#endif
+
+static int force_lower_case = 0;
+
+/* Match pattern "p" against the a virtually-joined string consisting
+ * of "text" and any strings in array "a". */
+static int dowild(const uchar *p, const uchar *text, const uchar*const *a)
+{
+    uchar p_ch;
+
+#ifdef WILD_TEST_ITERATIONS
+    wildmatch_iteration_count++;
+#endif
+
+    for ( ; (p_ch = *p) != '\0'; text++, p++) {
+	int matched, special;
+	uchar t_ch, prev_ch;
+	while ((t_ch = *text) == '\0') {
+	    if (*a == NULL) {
+		if (p_ch != '*')
+		    return ABORT_ALL;
+		break;
+	    }
+	    text = *a++;
+	}
+	if (force_lower_case && ISUPPER(t_ch))
+	    t_ch = tolower(t_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 FALSE;
+	    continue;
+	  case '?':
+	    /* Match anything but '/'. */
+	    if (t_ch == '/')
+		return FALSE;
+	    continue;
+	  case '*':
+	    if (*++p == '*') {
+		while (*++p == '*') {}
+		special = TRUE;
+	    } else
+		special = FALSE;
+	    if (*p == '\0') {
+		/* Trailing "**" matches everything.  Trailing "*" matches
+		 * only if there are no more slash characters. */
+		if (!special) {
+		    do {
+			if (strchr((char*)text, '/') != NULL)
+			    return FALSE;
+		    } while ((text = *a++) != NULL);
+		}
+		return TRUE;
+	    }
+	    while (1) {
+		if (t_ch == '\0') {
+		    if ((text = *a++) == NULL)
+			break;
+		    t_ch = *text;
+		    continue;
+		}
+		if ((matched = dowild(p, text, a)) != FALSE) {
+		    if (!special || matched != ABORT_TO_STARSTAR)
+			return matched;
+		} else if (!special && t_ch == '/')
+		    return ABORT_TO_STARSTAR;
+		t_ch = *++text;
+	    }
+	    return ABORT_ALL;
+	  case '[':
+	    p_ch = *++p;
+#ifdef NEGATE_CLASS2
+	    if (p_ch == NEGATE_CLASS2)
+		p_ch = NEGATE_CLASS;
+#endif
+	    /* Assign literal TRUE/FALSE because of "matched" comparison. */
+	    special = p_ch == NEGATE_CLASS? TRUE : FALSE;
+	    if (special) {
+		/* Inverted character class. */
+		p_ch = *++p;
+	    }
+	    prev_ch = 0;
+	    matched = FALSE;
+	    do {
+		if (!p_ch)
+		    return ABORT_ALL;
+		if (p_ch == '\\') {
+		    p_ch = *++p;
+		    if (!p_ch)
+			return ABORT_ALL;
+		    if (t_ch == p_ch)
+			matched = TRUE;
+		} else if (p_ch == '-' && prev_ch && p[1] && p[1] != ']') {
+		    p_ch = *++p;
+		    if (p_ch == '\\') {
+			p_ch = *++p;
+			if (!p_ch)
+			    return ABORT_ALL;
+		    }
+		    if (t_ch <= p_ch && t_ch >= prev_ch)
+			matched = TRUE;
+		    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 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 = TRUE;
+			continue;
+		    }
+		    if (CC_EQ(s,i, "alnum")) {
+			if (ISALNUM(t_ch))
+			    matched = TRUE;
+		    } else if (CC_EQ(s,i, "alpha")) {
+			if (ISALPHA(t_ch))
+			    matched = TRUE;
+		    } else if (CC_EQ(s,i, "blank")) {
+			if (ISBLANK(t_ch))
+			    matched = TRUE;
+		    } else if (CC_EQ(s,i, "cntrl")) {
+			if (ISCNTRL(t_ch))
+			    matched = TRUE;
+		    } else if (CC_EQ(s,i, "digit")) {
+			if (ISDIGIT(t_ch))
+			    matched = TRUE;
+		    } else if (CC_EQ(s,i, "graph")) {
+			if (ISGRAPH(t_ch))
+			    matched = TRUE;
+		    } else if (CC_EQ(s,i, "lower")) {
+			if (ISLOWER(t_ch))
+			    matched = TRUE;
+		    } else if (CC_EQ(s,i, "print")) {
+			if (ISPRINT(t_ch))
+			    matched = TRUE;
+		    } else if (CC_EQ(s,i, "punct")) {
+			if (ISPUNCT(t_ch))
+			    matched = TRUE;
+		    } else if (CC_EQ(s,i, "space")) {
+			if (ISSPACE(t_ch))
+			    matched = TRUE;
+		    } else if (CC_EQ(s,i, "upper")) {
+			if (ISUPPER(t_ch))
+			    matched = TRUE;
+		    } else if (CC_EQ(s,i, "xdigit")) {
+			if (ISXDIGIT(t_ch))
+			    matched = TRUE;
+		    } else /* malformed [:class:] string */
+			return ABORT_ALL;
+		    p_ch = 0; /* This makes "prev_ch" get set to 0. */
+		} else if (t_ch == p_ch)
+		    matched = TRUE;
+	    } while (prev_ch = p_ch, (p_ch = *++p) != ']');
+	    if (matched == special || t_ch == '/')
+		return FALSE;
+	    continue;
+	}
+    }
+
+    do {
+	if (*text)
+	    return FALSE;
+    } while ((text = *a++) != NULL);
+
+    return TRUE;
+}
+
+/* Match literal string "s" against the a virtually-joined string consisting
+ * of "text" and any strings in array "a". */
+static int doliteral(const uchar *s, const uchar *text, const uchar*const *a)
+{
+    for ( ; *s != '\0'; text++, s++) {
+	while (*text == '\0') {
+	    if ((text = *a++) == NULL)
+		return FALSE;
+	}
+	if (*text != *s)
+	    return FALSE;
+    }
+
+    do {
+	if (*text)
+	    return FALSE;
+    } while ((text = *a++) != NULL);
+
+    return TRUE;
+}
+
+/* Return the last "count" path elements from the concatenated string.
+ * We return a string pointer to the start of the string, and update the
+ * array pointer-pointer to point to any remaining string elements. */
+static const uchar *trailing_N_elements(const uchar*const **a_ptr, int count)
+{
+    const uchar*const *a = *a_ptr;
+    const uchar*const *first_a = a;
+
+    while (*a)
+	    a++;
+
+    while (a != first_a) {
+	const uchar *s = *--a;
+	s += strlen((char*)s);
+	while (--s >= *a) {
+	    if (*s == '/' && !--count) {
+		*a_ptr = a+1;
+		return s+1;
+	    }
+	}
+    }
+
+    if (count == 1) {
+	*a_ptr = a+1;
+	return *a;
+    }
+
+    return NULL;
+}
+
+/* Match the "pattern" against the "text" string. */
+int wildmatch(const char *pattern, const char *text)
+{
+    static const uchar *nomore[1]; /* A NULL pointer. */
+#ifdef WILD_TEST_ITERATIONS
+    wildmatch_iteration_count = 0;
+#endif
+    return dowild((const uchar*)pattern, (const uchar*)text, nomore) == TRUE;
+}
+
+/* Match the "pattern" against the forced-to-lower-case "text" string. */
+int iwildmatch(const char *pattern, const char *text)
+{
+    static const uchar *nomore[1]; /* A NULL pointer. */
+    int ret;
+#ifdef WILD_TEST_ITERATIONS
+    wildmatch_iteration_count = 0;
+#endif
+    force_lower_case = 1;
+    ret = dowild((const uchar*)pattern, (const uchar*)text, nomore) == TRUE;
+    force_lower_case = 0;
+    return ret;
+}
+
+/* Match pattern "p" against the a virtually-joined string consisting
+ * of all the pointers in array "texts" (which has a NULL pointer at the
+ * end).  The int "where" can be 0 (normal matching), > 0 (match only
+ * the trailing N slash-separated filename components of "texts"), or < 0
+ * (match the "pattern" at the start or after any slash in "texts"). */
+int wildmatch_array(const char *pattern, const char*const *texts, int where)
+{
+    const uchar *p = (const uchar*)pattern;
+    const uchar*const *a = (const uchar*const*)texts;
+    const uchar *text;
+    int matched;
+
+#ifdef WILD_TEST_ITERATIONS
+    wildmatch_iteration_count = 0;
+#endif
+
+    if (where > 0)
+	text = trailing_N_elements(&a, where);
+    else
+	text = *a++;
+    if (!text)
+	return FALSE;
+
+    if ((matched = dowild(p, text, a)) != TRUE && where < 0
+     && matched != ABORT_ALL) {
+	while (1) {
+	    if (*text == '\0') {
+		if ((text = (uchar*)*a++) == NULL)
+		    return FALSE;
+		continue;
+	    }
+	    if (*text++ == '/' && (matched = dowild(p, text, a)) != FALSE
+	     && matched != ABORT_TO_STARSTAR)
+		break;
+	}
+    }
+    return matched == TRUE;
+}
+
+/* Match literal string "s" against the a virtually-joined string consisting
+ * of all the pointers in array "texts" (which has a NULL pointer at the
+ * end).  The int "where" can be 0 (normal matching), or > 0 (match
+ * only the trailing N slash-separated filename components of "texts"). */
+int litmatch_array(const char *string, const char*const *texts, int where)
+{
+    const uchar *s = (const uchar*)string;
+    const uchar*const *a = (const uchar* const*)texts;
+    const uchar *text;
+
+    if (where > 0)
+	text = trailing_N_elements(&a, where);
+    else
+	text = *a++;
+    if (!text)
+	return FALSE;
+
+    return doliteral(s, text, a) == TRUE;
+}