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-rw-r--r--compat/win32/path-utils.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/compat/win32/path-utils.c b/compat/win32/path-utils.c
index d9d3641..ebf2f12 100644
--- a/compat/win32/path-utils.c
+++ b/compat/win32/path-utils.c
@@ -1,5 +1,29 @@
#include "../../git-compat-util.h"
+int win32_has_dos_drive_prefix(const char *path)
+{
+ int i;
+
+ /*
+ * Does it start with an ASCII letter (i.e. highest bit not set),
+ * followed by a colon?
+ */
+ if (!(0x80 & (unsigned char)*path))
+ return *path && path[1] == ':' ? 2 : 0;
+
+ /*
+ * While drive letters must be letters of the English alphabet, it is
+ * possible to assign virtually _any_ Unicode character via `subst` as
+ * a drive letter to "virtual drives". Even `1`, or `ä`. Or fun stuff
+ * like this:
+ *
+ * subst ֍: %USERPROFILE%\Desktop
+ */
+ for (i = 1; i < 4 && (0x80 & (unsigned char)path[i]); i++)
+ ; /* skip first UTF-8 character */
+ return path[i] == ':' ? i + 1 : 0;
+}
+
int win32_skip_dos_drive_prefix(char **path)
{
int ret = has_dos_drive_prefix(*path);