From de1dd33882b872d81e3f5b836eb51c2185dfe716 Mon Sep 17 00:00:00 2001
From: Lisa Milne <lisamilne618@gmail.com>
Date: Fri, 8 Dec 2023 15:52:27 +1000
Subject: [PATCH] libtime and the start of time and date handling

---
 clite/commands.js | 16 +++++++--
 clite/core.js     |  2 +-
 clite/libtime.js  | 85 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 99 insertions(+), 4 deletions(-)
 create mode 100644 clite/libtime.js

diff --git a/clite/commands.js b/clite/commands.js
index e93e8c5..baa99d2 100644
--- a/clite/commands.js
+++ b/clite/commands.js
@@ -1192,13 +1192,23 @@ Options:
 	return 0;
 });
 
+clite.commands.load('date',function(args,env,io) {
+
+	return 0;
+});
+
 if (window.location.protocol == 'file:')
 clite.commands.load('test',function(args,env,io) {
 	var stdio = io.include('stdio');
 	var stdlib = io.include('stdlib');
-	stdio.printf('Hello world');
-	stdio.printf('uid:%d',stdlib.getuid());
-	stdio.printf('%#15x:%15o:%15.5f:%0$15.5f:%%:',10,12,8.123456789);
+	var time = io.include('time');
+	var t = time.time();
+	stdio.printf('time is: %d\n',t);
+	var tm = time.gmtime(t);
+	stdio.printf('gmtime gives: %d %d %d %d %d %d %d %d %d\n',tm.tm_sec,tm.tm_min,tm.tm_hour,tm.tm_mday,tm.tm_mon,tm.tm_year,tm.tm_wday,tm.tm_yday,tm.tm_isdst);
+	stdio.printf('Hello world\n');
+	stdio.printf('uid:%d\n',stdlib.getuid());
+	stdio.printf('%#15x:%15o:%15.5f:%0$15.5f:%%:\n',10,12,8.123456789);
 	function rcb(data) {
 		stdio.write(io.stdout,data);
 		var u = stdlib.getpwnam(data);
diff --git a/clite/core.js b/clite/core.js
index f5f9980..280fd9b 100644
--- a/clite/core.js
+++ b/clite/core.js
@@ -8,7 +8,7 @@ var clite = {
 		// a list of program/command files to load
 		prog:['commands.js','shell.js','vi.js'],
 		// a list of library files to load
-		libs:['libclite.js','libcurses.js','libstd.js','libstdio.js','libterm.js']
+		libs:['libclite.js','libcurses.js','libstd.js','libstdio.js','libterm.js','libtime.js']
 	},
 	core:{
 		execSafe:function(f) {
diff --git a/clite/libtime.js b/clite/libtime.js
new file mode 100644
index 0000000..3599f66
--- /dev/null
+++ b/clite/libtime.js
@@ -0,0 +1,85 @@
+clite.libs.data = function() {
+
+clite.libs.load('libtime','time',function(io,env) {
+	var data = {
+		days:['Sun','Mon','Tue','Wed','Thu','Fri','Sat'],
+		months:['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'],
+		mdays:[31,28,31,30,31,30,31,31,30,31,30,31]
+	}
+	function getyDay(mon,mday,year) {
+		var yday = 0;
+		for (var i = 0; i<mon; i++) {
+			yday += data.mdays[i];
+		}
+		year += 1900;
+		// plus one for a leap year
+		if (yday > 59 && (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)))
+			yday++;
+		return yday+mday;
+	}
+	function readTime() {
+		var fd = clite.io.open(io.pid,'/dev/time',clite.io.flags.O_RDONLY|clite.io.flags.O_SYNC);
+		if (!fd)
+			return 0;
+		var t = clite.io.readAll(io.pid,fd);
+		if (!t) {
+			t = '0';
+		}else{
+			t = t.toString();
+		}
+		clite.io.close(io.pid,fd);
+		return parseInt(t,10);
+	}
+	function genTime(time,tz) {
+		var t = time+tz;
+		var tm = Object.create({
+			tm_sec:0,	// seconds (0-60)
+			tm_min:0,	// minutes (0-59)
+			tm_hour:0,	// hour (0-23)
+			tm_mday:0,	// day of month (0-31)
+			tm_mon:0,	// month of year (0-11)
+			tm_year:0,	// years since 1900
+			tm_wday:0,	// day of week (0-6, sunday = 0)
+			tm_yday:0,	// day of year (0-365)
+			tm_isdst:0	// 1 if daylight savings
+		});
+
+		var td = new Date(t*1000);
+
+		tm.tm_sec = td.getUTCSeconds();
+		tm.tm_min = td.getUTCMinutes();
+		tm.tm_hour = td.getUTCHours();
+		tm.tm_mday = td.getUTCDate();
+		tm.tm_mon = td.getUTCMonth();
+		tm.tm_year = td.getUTCFullYear()-1900;
+		tm.tm_wday = td.getUTCDay();
+		tm.tm_yday = getyDay(tm.tm_mon,tm.tm_mday,tm.tm_year);
+
+		return tm;
+	}
+
+	//
+
+return Object.create({
+
+	asctime:function(timeptr) {
+		return data.days[timeptr.tm_wday]+' '+data.months[timeptr.tm_mon]+' '+timeptr.tm_mday+' '+timeptr.tm_hour+':'+timeptr.tm_min+':'+timeptr.tm_sec+' '+(1900+timeptr.tm_year)+'\n';
+	},
+	gmtime:function(time) {
+		return genTime(time,0);
+	},
+	localtime:function(time) {
+		// TODO: fill in tz with seconds offset for current timezone
+		var tz = 0;
+		return genTime(time,tz);
+	},
+	time:function() {
+		var t = readTime();
+		return Math.floor(t/1000.0); // convert from milliseconds to seconds
+	}
+
+});
+
+});
+
+}