From 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Sat, 12 Feb 2011 00:22:29 -0500
Subject: initial check-in, version 0.5.0

---
 src/regex/fnmatch.c | 150 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 src/regex/fnmatch.c

(limited to 'src/regex/fnmatch.c')

diff --git a/src/regex/fnmatch.c b/src/regex/fnmatch.c
new file mode 100644
index 00000000..5f2fccdb
--- /dev/null
+++ b/src/regex/fnmatch.c
@@ -0,0 +1,150 @@
+#include <fnmatch.h>
+#include <wctype.h>
+#include <string.h>
+#include <wchar.h>
+#include <stdlib.h>
+#include <limits.h>
+
+static int next(const char **s)
+{
+	wchar_t c;
+	int l = mbtowc(&c, *s, MB_LEN_MAX);
+	/* hack to allow literal matches of invalid byte sequences */
+	if (l < 0) return (unsigned char)*(*s)++ - 0x100;
+	*s += l;
+	return c;
+}
+
+#define BRACKET_ERROR  -0x100
+#define BRACKET_NOCHAR -0x101
+
+static int bracket_next(const char **s)
+{
+	int c;
+	int type;
+	if (**s == '[') {
+		type = *(*s+1);
+		if (type == '.' || type == '=') {
+			*s += 2;
+			c = next(s);
+			if (c <= 0) return BRACKET_ERROR;
+			if (**s == type && *(*s+1) == ']') {
+				*s += 2;
+				return c;
+			}
+			for (; **s && (**s != type || *(*s+1) != ']'); (*s)++);
+			if (!**s) return BRACKET_ERROR;
+			*s += 2;
+			return BRACKET_NOCHAR;
+		}
+	}
+	c = next(s);
+	if (c <= 0) return BRACKET_ERROR;
+	return c;
+}
+
+#define __FNM_CONT 0x8000
+
+int fnmatch(const char *p, const char *s, int flags)
+{
+	int c, d, k;
+	int not;
+	int match;
+	int first;
+	int no_slash = (flags & FNM_PATHNAME) ? '/' : 0;
+	int no_period = (flags & FNM_PERIOD) && !(flags & __FNM_CONT) ? '.' : 0x100;
+
+	flags |= __FNM_CONT;
+
+	while ((c = *p++)) {
+		switch (c) {
+		case '?':
+			k = next(&s);
+			if (!k || k == no_period || k == no_slash)
+				return FNM_NOMATCH;
+			break;
+		case '\\':
+			if (!(flags & FNM_NOESCAPE)) {
+				c = *p++;
+				goto literal;
+			}
+			if (*s++ != c) return FNM_NOMATCH;
+			break;
+		case '*':
+			for (; *p == '*'; p++);
+			if (*p && !*s) return FNM_NOMATCH;
+			if (*s == no_period)
+				return FNM_NOMATCH;
+			if (!*p && (!no_slash || !strchr(s, no_slash)))
+				return 0;
+			for (; *s; s++)
+				if (!fnmatch(p, s, flags))
+					return 0;
+				else if (*s == no_slash)
+					break;
+			return FNM_NOMATCH;
+		case '[':
+			not = (*p == '!' || *p == '^');
+			if (not) p++;
+			k = next(&s);
+			if (!k || k == no_slash || k == no_period)
+				return FNM_NOMATCH;
+			match = 0;
+			first = 1;
+			for (;;) {
+				if (!*p) return FNM_NOMATCH;
+				if (*p == ']' && !first) break;
+				first = 0;
+				if (*p == '[' && *(p+1) == ':') {
+					const char *z;
+					p += 2;
+					for (z=p; *z && (*z != ':' || *(z+1) != ']'); z++);
+					if (!*z || z-p > 32) { /* FIXME: symbolic const? */
+						return FNM_NOMATCH;
+					} else {
+						char class[z-p+1];
+						memcpy(class, p, z-p);
+						class[z-p] = 0;
+						if (iswctype(k, wctype(class)))
+							match = 1;
+					}
+					p = z+2;
+					continue;
+				}
+				c = bracket_next(&p);
+				if (c == BRACKET_ERROR)
+					return FNM_NOMATCH;
+				if (c == BRACKET_NOCHAR)
+					continue;
+				if (*p == '-' && *(p+1) != ']') {
+					p++;
+					d = bracket_next(&p);
+					if (d == BRACKET_ERROR)
+						return FNM_NOMATCH;
+					if (d == BRACKET_NOCHAR)
+						continue;
+					if (k >= c && k <= d)
+						match = 1;
+					continue;
+				}
+				if (k == c) match = 1;
+			}
+			p++;
+			if (not == match)
+				return FNM_NOMATCH;
+			break;
+		default:
+		literal:
+			if (*s++ != c)
+				return FNM_NOMATCH;
+			if (c == no_slash && (flags & FNM_PERIOD)) {
+				no_period = '.';
+				continue;
+			}
+			break;
+		}
+		no_period = 0x100;
+	}
+	if (*s) return FNM_NOMATCH;
+	return 0;
+}
-- 
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