test-wildmatch: avoid Windows path mangling

The MSYS bash mangles arguments that begin with a forward slash
when they are passed to test-wildmatch. This causes tests to fail.
Avoid mangling by prepending "XXX", which is removed by
test-wildmatch before further processing.

[J6t: reworded commit message]

Reported-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Johannes Sixt <j6t@kdbg.org>

t/t3070-wildmatch.sh

@@ -74,7 +74,7 @@ match 0 0 'foo/bar' 'foo[/]bar'
 match 0 0 'foo/bar' 'f[^eiu][^eiu][^eiu][^eiu][^eiu]r'
 match 1 1 'foo-bar' 'f[^eiu][^eiu][^eiu][^eiu][^eiu]r'
 match 1 0 'foo' '**/foo'
-match 1 x '/foo' '**/foo'
+match 1 x 'XXX/foo' '**/foo'
 match 1 0 'bar/baz/foo' '**/foo'
 match 0 0 'bar/baz/foo' '*/foo'
 match 0 0 'foo/bar/baz' '**/bar*'
@@ -95,8 +95,8 @@ match 0 0 ']' '[!]-]'
 match 1 x 'a' '[!]-]'
 match 0 0 '' '\'
 match 0 x '\' '\'
-match 0 x '/\' '*/\'
-match 1 x '/\' '*/\\'
+match 0 x 'XXX/\' '*/\'
+match 1 x 'XXX/\' '*/\\'
 match 1 1 'foo' 'foo'
 match 1 1 '@foo' '@foo'
 match 0 0 'foo' '@foo'
@@ -187,8 +187,8 @@ match 0 0 '-' '[[-\]]'
 match 1 1 '-adobe-courier-bold-o-normal--12-120-75-75-m-70-iso8859-1' '-*-*-*-*-*-*-12-*-*-*-m-*-*-*'
 match 0 0 '-adobe-courier-bold-o-normal--12-120-75-75-X-70-iso8859-1' '-*-*-*-*-*-*-12-*-*-*-m-*-*-*'
 match 0 0 '-adobe-courier-bold-o-normal--12-120-75-75-/-70-iso8859-1' '-*-*-*-*-*-*-12-*-*-*-m-*-*-*'
-match 1 1 '/adobe/courier/bold/o/normal//12/120/75/75/m/70/iso8859/1' '/*/*/*/*/*/*/12/*/*/*/m/*/*/*'
-match 0 0 '/adobe/courier/bold/o/normal//12/120/75/75/X/70/iso8859/1' '/*/*/*/*/*/*/12/*/*/*/m/*/*/*'
+match 1 1 'XXX/adobe/courier/bold/o/normal//12/120/75/75/m/70/iso8859/1' 'XXX/*/*/*/*/*/*/12/*/*/*/m/*/*/*'
+match 0 0 'XXX/adobe/courier/bold/o/normal//12/120/75/75/X/70/iso8859/1' 'XXX/*/*/*/*/*/*/12/*/*/*/m/*/*/*'
 match 1 0 'abcd/abcdefg/abcdefghijk/abcdefghijklmnop.txt' '**/*a*b*g*n*t'
 match 0 0 'abcd/abcdefg/abcdefghijk/abcdefghijklmnop.txtz' '**/*a*b*g*n*t'
 

test-wildmatch.c

@@ -3,6 +3,14 @@
 
 int main(int argc, char **argv)
 {
+	int i;
+	for (i = 2; i < argc; i++) {
+		if (argv[i][0] == '/')
+			die("Forward slash is not allowed at the beginning of the\n"
+			    "pattern because Windows does not like it. Use `XXX/' instead.");
+		else if (!strncmp(argv[i], "XXX/", 4))
+			argv[i] += 3;
+	}
 	if (!strcmp(argv[1], "wildmatch"))
 		return !!wildmatch(argv[3], argv[2], 0);
 	else if (!strcmp(argv[1], "iwildmatch"))