dhcpcd produces incorrect /etc/resolv.conf

[Takakazu Satoh]

Package: dhcpcd5 1:8.1.2-1+rpt9 armhf

How to reproduce the bug:

Write the following static eth0 setting in /etc/dhcpcd.conf

interface eth0
static ip_address=192.168.99.99/24
static routers=192.168.99.1
static domain_name_servers=192.168.99.53
static domain_name=home.arpa

dhcpcd updates /etc/resolv.conf as follows:

   # Generated by resolvconf
   domain home.arpa

which should be

   # Generated by resolvconf
   domain home.arpa
   nameserver 192.168.99.53

Possible Workaround:
Specify domain_name before domain_name_servers, i.e.

interface eth0
static ip_address=192.168.99.99/24
static routers=192.168.99.1
static domain_name=home.arpa
static domain_name_servers=192.168.99.53

In my environment, this produces the desired resolve.conf

I may be wrong but I believe this bug is caused by incorrect identifier
comparison in src/script.c.
The following patch seems to fix the problem but is not tested extensively.

--- script.c-dist 2019-01-22 23:53:45.000000000 +0900
+++ script.c 2023-07-07 18:53:51.879120988 +0900
@@ -156,7 +156,8 @@
                    if (strncmp(ne[j], prefix, strlen(prefix)) == 0 &&
                            ne[j][strlen(prefix)] == '_' &&
                            strncmp(ne[j] + strlen(prefix) + 1,
- config[i], e1) == 0)
+ config[i], e1) == 0 &&
+ ne[j][e1+strlen(prefix)+1] == '=')
   {
                          p = make_var(prefix, config[i]);
    if (p == NULL) {