wildmatch: remove static variable force_lower_case

One place less to worry about thread safety. Also combine wildmatch
and iwildmatch into one.

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

test-wildmatch.c

@@ -4,9 +4,9 @@
 int main(int argc, char **argv)
 {
 	if (!strcmp(argv[1], "wildmatch"))
-		return !!wildmatch(argv[3], argv[2]);
+		return !!wildmatch(argv[3], argv[2], 0);
 	else if (!strcmp(argv[1], "iwildmatch"))
-		return !!iwildmatch(argv[3], argv[2]);
+		return !!wildmatch(argv[3], argv[2], FNM_CASEFOLD);
 	else if (!strcmp(argv[1], "fnmatch"))
 		return !!fnmatch(argv[3], argv[2], FNM_PATHNAME);
 	else

wildmatch.c

@@ -59,10 +59,8 @@ typedef unsigned char uchar;
 #define ISUPPER(c) (ISASCII(c) && isupper(c))
 #define ISXDIGIT(c) (ISASCII(c) && isxdigit(c))
 
-static int force_lower_case = 0;
-
 /* Match pattern "p" against "text" */
-static int dowild(const uchar *p, const uchar *text)
+static int dowild(const uchar *p, const uchar *text, int force_lower_case)
 {
 	uchar p_ch;
 
@@ -106,7 +104,7 @@ static int dowild(const uchar *p, const uchar *text)
 			while (1) {
 				if (t_ch == '\0')
 					break;
-				if ((matched = dowild(p, text)) != NOMATCH) {
+				if ((matched = dowild(p, text,  force_lower_case)) != NOMATCH) {
 					if (!special || matched != ABORT_TO_STARSTAR)
 						return matched;
 				} else if (!special && t_ch == '/')
@@ -214,17 +212,8 @@ static int dowild(const uchar *p, const uchar *text)
 }
 
 /* Match the "pattern" against the "text" string. */
-int wildmatch(const char *pattern, const char *text)
+int wildmatch(const char *pattern, const char *text, int flags)
 {
-	return dowild((const uchar*)pattern, (const uchar*)text);
-}
-
-/* Match the "pattern" against the forced-to-lower-case "text" string. */
-int iwildmatch(const char *pattern, const char *text)
-{
-	int ret;
-	force_lower_case = 1;
-	ret = dowild((const uchar*)pattern, (const uchar*)text);
-	force_lower_case = 0;
-	return ret;
+	return dowild((const uchar*)pattern, (const uchar*)text,
+		      flags & FNM_CASEFOLD ? 1 :0);
 }

wildmatch.h

@@ -1,4 +1,3 @@
 /* wildmatch.h */
 
-int wildmatch(const char *pattern, const char *text);
-int iwildmatch(const char *pattern, const char *text);
+int wildmatch(const char *pattern, const char *text, int flags);