From 28284a348d11599f32f8af08024e3730afdc3269 Mon Sep 17 00:00:00 2001
From: Gediminas Jakutis <gediminas@varciai.lt>
Date: Mon, 7 May 2018 00:31:07 +0300
Subject: server: initial work on command line argument handling.

---
 src/server/main.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++----
 src/server/ui.h   |  3 --
 2 files changed, 77 insertions(+), 9 deletions(-)

(limited to 'src/server')

diff --git a/src/server/main.c b/src/server/main.c
index 8406d11..939581b 100644
--- a/src/server/main.c
+++ b/src/server/main.c
@@ -22,11 +22,11 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <netinet/udp.h>
+#include <arpa/inet.h>
 #include <poll.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <string.h>
-#include <arpa/inet.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <time.h>
@@ -34,14 +34,26 @@
 #include "net.h"
 #include "ui.h"
 
-static int init(int argc, char ***argv, const unsigned short int port, enum uitype ui);
+struct settings {
+	struct timespec period;
+	enum uitype ui;
+	unsigned short int port;
+};
+
+static int init(int argc, char ***argv, const struct settings * const settings);
+static struct settings parseargs(int argc, char **argv);
+static enum uitype identify_ui(const char * const s);
+static struct timespec calc_period(const char * const s);
+static size_t printhelp(const char * const name);
 
 int main(int argc, char **argv)
 {
+	struct settings settings;
 	int ret;
 	int nd;
 
-	nd = init(argc, &argv, 2191, UI_DEFAULT);
+	settings = parseargs(argc, argv);
+	nd = init(argc, &argv, &settings);
 
 	if (nd == ERROR) {
 		ret = nd;
@@ -54,18 +66,18 @@ fail:
 	return ret;
 }
 
-static int init(int argc, char ***argv, const unsigned short int port, enum uitype ui)
+static int init(int argc, char ***argv, const struct settings * const settings)
 {
 	int ret = A_OK;
 	int nd;
 
-	nd = net_init(port);
+	nd = net_init(settings->port);
 	if (nd == ERROR) {
 		ret = nd;
 		goto fail;
 	}
 
-	ret = ui_init(argc, argv, ui, nd, DEFAULT_PERIOD);
+	ret = ui_init(argc, argv, settings->ui, nd, settings->period);
 	if (ret == ERROR) {
 		net_close(nd);
 		goto fail;
@@ -74,3 +86,62 @@ static int init(int argc, char ***argv, const unsigned short int port, enum uity
 fail:
 	return ret;
 }
+
+static struct settings parseargs(int argc, char **argv)
+{
+	/* collection of defaults */
+	struct settings ret = {{0, 200 * 1000 * 1000}, /* 200 ms */
+				ui_curses,
+				2191};
+	ssize_t i;
+
+	if (argc == 1) {
+		return ret;
+	}
+
+	for (i = 1; i < argc; ++i) {
+
+		if (!(strncmp(argv[i], "--period=", 8))) {
+			ret.period = strlen(argv[i]) > 9 ? calc_period(argv[i] + 9) : (struct timespec) {0, printhelp(*argv)};
+		} else if (!(strncmp(argv[i], "--ui=", 8))) {
+			ret.ui = strlen(argv[i]) > 5 ? identify_ui(argv[i] + 5) : printhelp(*argv);
+		} else if (!(strncmp(argv[i], "--port=", 7))) {
+			ret.port = strlen(argv[i]) > 7 ? strtoul(argv[i] + 7, NULL, 10) : printhelp(*argv);
+		} else {
+			printhelp(*argv);
+		}
+	}
+
+	return ret;
+}
+
+static enum uitype identify_ui(const char * const s)
+{
+	/* TODO: stub! */
+	return ui_curses;
+}
+
+static struct timespec calc_period(const char * const s)
+{
+	/* TODO: stub! */
+	return (struct timespec) {0, 200 * 1000 * 1000};
+}
+
+static size_t printhelp(const char * const name)
+{
+	printf(	"This is a coffeetemp companion application\n"
+		"\n"
+		"usage:\t%s [options]\n"
+		"\n"
+		"Options:\n"
+		" --period=<num>    set network polling rate to <num> milliseconds (default: 200)\n"
+		" --ui=<name>       set the UI frontend (default: curses)\n"
+		"                           * possible choices: [none, file, curses, gtk]\n"
+		" --port=<num>      set the listening port number to <num>\n"
+		"\n"
+		"In case more than one same option is provided, the last one take precedence\n"
+		"\n",
+			name);
+	exit(EXIT_FAILURE);
+	return 0;
+}
diff --git a/src/server/ui.h b/src/server/ui.h
index 8070be3..d764180 100644
--- a/src/server/ui.h
+++ b/src/server/ui.h
@@ -30,9 +30,6 @@ enum uitype {
 	ui_gtk
 };
 
-static const enum uitype UI_DEFAULT = ui_curses;
-static const struct timespec DEFAULT_PERIOD = {0, 200 * 1000 * 1000}; /* 200 ms */
-
 int ui_init(int argc, char ***argv, enum uitype ui, int nd, struct timespec period);
 int ui_startloop(void);
 
-- 
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