2 files changed, 26 insertions, 0 deletions
diff --git a/compat/mingw.c b/compat/mingw.c
index e9892f8ee4..a0e13bc862 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1823,3 +1823,27 @@ pid_t waitpid(pid_t pid, int *status, int options)
 	errno = EINVAL;
 	return -1;
 }
+
+int mingw_offset_1st_component(const char *path)
+{
+	int offset = 0;
+	if (has_dos_drive_prefix(path))
+		offset = 2;
+
+	/* unc paths */
+	else if (is_dir_sep(path[0]) && is_dir_sep(path[1])) {
+
+		/* skip server name */
+		char *pos = strpbrk(path + 2, "\\/");
+		if (!pos)
+			return 0; /* Error: malformed unc path */
+
+		do {
+			pos++;
+		} while (*pos && !is_dir_sep(*pos));
+
+		offset = pos - path;
+	}
+
+	return offset + is_dir_sep(path[offset]);
+}
diff --git a/compat/mingw.h b/compat/mingw.h
index e033e720c9..3eaf822e28 100644
--- a/compat/mingw.h
+++ b/compat/mingw.h
@@ -339,6 +339,8 @@ static inline char *mingw_find_last_dir_sep(const char *path)
 	return ret;
 }
 #define find_last_dir_sep mingw_find_last_dir_sep
+int mingw_offset_1st_component(const char *path);
+#define offset_1st_component mingw_offset_1st_component
 #define PATH_SEP ';'
 #define PRIuMAX "I64u"
 #define PRId64 "I64d"