From 8f69f14344ba7322de1b52d116c28f27363cc44f Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Dec 14 2022 16:06:02 +0000
Subject: string-util: introduce ascii_ishex()


(cherry picked from commit 0ce8870f19a839c7b09b4ef5b61c2d363050c7d9)

---

diff --git a/src/fundamental/string-util-fundamental.h b/src/fundamental/string-util-fundamental.h
index ecf32e5..d823147 100644
--- a/src/fundamental/string-util-fundamental.h
+++ b/src/fundamental/string-util-fundamental.h
@@ -110,6 +110,10 @@ static inline bool ascii_isdigit(sd_char a) {
         return a >= '0' && a <= '9';
 }
 
+static inline bool ascii_ishex(sd_char a) {
+        return ascii_isdigit(a) || (a >= 'a' && a <= 'f') || (a >= 'A' && a <= 'F');
+}
+
 static inline bool ascii_isalpha(sd_char a) {
         /* A pure ASCII, locale independent version of isalpha() */
         return (a >= 'a' && a <= 'z') || (a >= 'A' && a <= 'Z');