builtin/credential-store: move is_rfc3986_unreserved to url.[ch]

is_rfc3986_unreserved() was moved to credential-store.c and was made
static by f89854362c (credential-store: move related functions to
credential-store file, 2023-06-06) under a correct assumption, at the
time, that it was the only place using it.

However now we need it to apply URL-encoding to submodule names when
constructing gitdir paths, to avoid conflicts, so bring it back as a
public function exposed via url.h, instead of the old helper path
(strbuf), which has nothing to do with 3986 encoding/decoding anymore.

This function will be used in subsequent commits which do the encoding.

Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/url.c b/url.c
index 282b12495a..adc289229c 100644
--- a/url.c
+++ b/url.c
@@ -3,6 +3,12 @@
 #include "strbuf.h"
 #include "url.h"
 
+int is_rfc3986_unreserved(char ch)
+{
+	return isalnum(ch) ||
+		ch == '-' || ch == '_' || ch == '.' || ch == '~';
+}
+
 int is_urlschemechar(int first_flag, int ch)
 {
 	/*