slightly alter the semantics of config files:

- if no config file, continue silently and apply defaults
 - if config file, parse and move on
 - if config file specified but not found, error out

ok oga@

conf.c

@@ -168,6 +168,8 @@ conf_init(struct conf *c)
 void
 conf_setup(struct conf *c, const char *conf_file)
 {
+	struct stat sb;
+
 	if (conf_file == NULL) {
 		char *home = getenv("HOME");
 
@@ -177,7 +179,11 @@ conf_setup(struct conf *c, const char *conf_file)
 		snprintf(c->conf_path, sizeof(c->conf_path), "%s/%s", home,
 		    CONFFILE);
 	} else
-		snprintf(c->conf_path, sizeof(c->conf_path), "%s", conf_file);
+		if (stat(conf_file, &sb) == -1 || !(sb.st_mode & S_IFREG))
+			errx(1, "%s: %s", conf_file, strerror(errno));
+		else
+			snprintf(c->conf_path, sizeof(c->conf_path), "%s",
+			    conf_file);
 
 	conf_init(c);
 

parse.y

@@ -441,6 +441,7 @@ pushfile(const char *name)
 	nfile->name = xstrdup(name);
 
 	if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
+		if (errno != ENOENT)
 			warn("%s", nfile->name);
 		free(nfile->name);
 		free(nfile);