clean up server/main by moving cli option handling to separate files

server/src/main.c

@@ -1,67 +1,25 @@
 // main.c
 
 #include <stdio.h>
-#include <stdlib.h>
-#include <stdbool.h>
-#include <sys/syslog.h>
 #include <unistd.h>
 
-#include <getopt.h>
-
 #include "error.h"
-#include "daemon.h"
+#include "opts.h"
-
-struct options_t {
-    bool daemonise;
-};
-
-
-static enum error_t parse_arguments(
-    struct options_t *options,
-    int argc, char **argv
-) {
-    static struct option const long_options[] = {
-        { "daemon", no_argument, 0, 'd' },
-    };
-
-    while (true) {
-        int option_index = 0;
-
-        int c = getopt_long(argc, argv, "d", long_options, &option_index);
-        if (c == -1) break;
-
-        switch (c) {
-            case 'd': options->daemonise = true; break;
-            default: return ERR_INPUT;
-        }
-    }
-
-    return ERR_OK;
-}
-
 
 int main(int argc, char **argv) {
     enum error_t err = ERR_OK;
 
     struct options_t options = { false };
-    err = parse_arguments(&options, argc, argv);
+    err = opts_parse(&options, argc, argv);
     if (err) goto handle_error;
 
-    if (options.daemonise) {
+    err = opts_init(&options);
-        err = daemonise();
     if (err) goto handle_error;
 
-        openlog(NULL, LOG_PID, LOG_DAEMON);
+    opts_free(&options);
-        syslog(LOG_NOTICE, "Daemon initialised");
+    return ERR_OK;
-    }
-
-    goto handle_exit;
-        // Is this the best way to do this? I didn't want to duplicate
-        // closing the syslog
 
 handle_error:
     printf("ERROR: %s\n", ERROR_STRS[err]);
-handle_exit:
-    if (options.daemonise) closelog();
     return err;
 }

server/src/opts.c

@@ -0,0 +1,53 @@
+// opts.c
+
+#include <stdlib.h>
+#include <assert.h>
+#include <sys/syslog.h>
+
+#include <getopt.h>
+
+#include "opts.h"
+#include "daemon.h"
+
+enum error_t opts_parse(struct options_t *options, int argc, char **argv) {
+    struct option const long_options[] = {
+        { "daemon", no_argument, 0, 'd' },
+    };
+
+    while (true) {
+        int option_index = 0;
+
+        int c = getopt_long(argc, argv, "d", long_options, &option_index);
+        if (c == -1) break;
+
+        switch (c) {
+            case 'd': options->daemonise = true; break;
+            default: return ERR_INPUT;
+        }
+    }
+
+    return ERR_OK;
+}
+
+
+enum error_t opts_init(struct options_t const *options) {
+    assert(options != NULL);
+    enum error_t err = ERR_OK;
+
+    if (options->daemonise) {
+        err = daemonise();
+        if (err) return err;
+
+        openlog(NULL, LOG_PID, LOG_DAEMON);
+        syslog(LOG_NOTICE, "Daemon initialised :-)");
+    }
+
+    return ERR_OK;
+}
+
+
+void opts_free(struct options_t const *options) {
+    assert(options != NULL);
+
+    if (options->daemonise) closelog();
+}

server/src/opts.h

@@ -0,0 +1,16 @@
+#ifndef OPTS_H
+#define OPTS_H
+
+#include <stdbool.h>
+
+#include "error.h"
+
+struct options_t {
+    bool daemonise;
+};
+
+enum error_t opts_parse(struct options_t *, int, char **);
+enum error_t opts_init(struct options_t const *);
+void opts_free(struct options_t const *);
+
+#endif