checkout: disallow bad paths on win32

Disallow:
 1. paths with trailing dot
 2. paths with trailing space
 3. paths with trailing colon
 4. paths that are 8.3 short names of .git folders ("GIT~1")
 5. paths that are reserved path names (COM1, LPT1, etc).
 6. paths with reserved DOS characters (colons, asterisks, etc)

These paths would (without \\?\ syntax) be elided to other paths - for
example, ".git." would be written as ".git".  As a result, writing these
paths literally (using \\?\ syntax) makes them hard to operate with from
the shell, Windows Explorer or other tools.  Disallow these.

1 files changed, 15 insertions, 0 deletions

diff --git a/src/util.c b/src/util.c
index 5c305950f..6b0efbea5 100644
--- a/src/util.c
+++ b/src/util.c
@@ -250,6 +250,21 @@ int git__prefixcmp_icase(const char *str, const char *prefix)
 	return strncasecmp(str, prefix, strlen(prefix));
 }
 
+int git__prefixncmp_icase(const char *str, size_t str_n, const char *prefix)
+{
+	int s, p;
+
+	while(str_n--) {
+		s = (unsigned char)tolower(*str++);
+		p = (unsigned char)tolower(*prefix++);
+
+		if (s != p)
+			return s - p;
+	}
+
+	return (0 - *prefix);
+}
+
 int git__suffixcmp(const char *str, const char *suffix)
 {
 	size_t a = strlen(str);