upssched: let UPSNAME@localhost specs copied from upsmon config "just work"

NEWS

@@ -243,6 +243,10 @@ https://github.com/networkupstools/nut/milestone/8
  - Clarified documentation in codebase according to end-user feedback [#1721,
    #1750 and others over time]
 
+ - upssched: let `UPSNAME@localhost` specification strings copied from
+   upsmon config "just work" (previously only exact UPSNAME matches were
+   supported) [#1858]
+
  - Several fixes for `upsmon` behavior [#1761, #1680...], including new
    ability to configure default POWERDOWNFLAG location -- packagers are
    encouraged to pick optimal location for their distributions (which

clients/upssched.c

@@ -1264,6 +1264,13 @@ static int conf_arg(size_t numargs, char **arg)
 	/* AT <notifytype> <upsname> <command> <cmdarg1> [<cmdarg2>] */
 	if (!strcmp(arg[0], "AT")) {
 
+		if (str_ends_with(arg[2], "@localhost")) {
+			/* Truncate: */
+			arg[2][strlen(arg[2]) - strlen("@localhost")] = '\0';
+			/* Make a little noise, but do not trash syslog about this: */
+			upsdebugx(1, "WARNING: The @localhost in UPS identifier is redundant for upssched");
+		}
+
 		/* don't use arg[5] unless we have it... */
 		if (numargs > 5)
 			parse_at(arg[1], arg[2], arg[3], arg[4], arg[5]);

common/str.c

@@ -615,6 +615,8 @@ int	str_to_double_strict(const char *string, double *number, const int base)
 	return 1;
 }
 
+/* Probably derived from https://stackoverflow.com/a/68816055/4715872
+ * or a similar suggestion */
 int str_ends_with(const char *s, const char *suff) {
 	size_t slen;
 	size_t sufflen;