From e1ecfef16f74dac23803c45f145939027e18eda9 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Wed, 23 Jun 2021 15:58:31 +0900
Subject: [PATCH] udev-util: introduce udev_replace_ifname()

---
 src/shared/udev-util.c | 17 +++++++++++++++++
 src/shared/udev-util.h |  1 +
 2 files changed, 18 insertions(+)

diff --git a/src/shared/udev-util.c b/src/shared/udev-util.c
index 06aede9d36..f934fc157e 100644
--- a/src/shared/udev-util.c
+++ b/src/shared/udev-util.c
@@ -18,6 +18,7 @@
 #include "parse-util.h"
 #include "path-util.h"
 #include "signal-util.h"
+#include "socket-util.h"
 #include "string-table.h"
 #include "string-util.h"
 #include "strxcpyx.h"
@@ -436,6 +437,22 @@ size_t udev_replace_whitespace(const char *str, char *to, size_t len) {
         return j;
 }
 
+size_t udev_replace_ifname(char *str) {
+        size_t replaced = 0;
+
+        assert(str);
+
+        /* See ifname_valid_full(). */
+
+        for (char *p = str; *p != '\0'; p++)
+                if (!ifname_valid_char(*p)) {
+                        *p = '_';
+                        replaced++;
+                }
+
+        return replaced;
+}
+
 size_t udev_replace_chars(char *str, const char *allow) {
         size_t i = 0, replaced = 0;
 
diff --git a/src/shared/udev-util.h b/src/shared/udev-util.h
index d1c33b86a7..276686da80 100644
--- a/src/shared/udev-util.h
+++ b/src/shared/udev-util.h
@@ -46,6 +46,7 @@ void log_device_uevent(sd_device *device, const char *str);
 
 int udev_rule_parse_value(char *str, char **ret_value, char **ret_endpos);
 size_t udev_replace_whitespace(const char *str, char *to, size_t len);
+size_t udev_replace_ifname(char *str);
 size_t udev_replace_chars(char *str, const char *allow);
 int udev_resolve_subsys_kernel(const char *string, char *result, size_t maxsize, bool read_value);
 
-- 
2.25.1