First commit to github

.gitignore

@@ -1,52 +1,10 @@
-# Prerequisites
-*.d
-
-# Object files
+tjdtodate
+*~
+*.1
 *.o
-*.ko
-*.obj
-*.elf
-
-# Linker output
-*.ilk
-*.map
-*.exp
-
-# Precompiled Headers
-*.gch
-*.pch
-
-# Libraries
-*.lib
-*.a
-*.la
-*.lo
-
-# Shared objects (inc. Windows DLLs)
-*.dll
-*.so
-*.so.*
-*.dylib
-
-# Executables
-*.exe
-*.out
-*.app
-*.i*86
-*.x86_64
-*.hex
-
-# Debug files
-*.dSYM/
-*.su
-*.idb
-*.pdb
-
-# Kernel Module Compile Results
-*.mod*
-*.cmd
-.tmp_versions/
-modules.order
-Module.symvers
-Mkfile.old
-dkms.conf
+fixxyplots.sh
+unixtodate
+datetounix
+datetomjd
+mjdtodate
+wintounix

Makefile

@@ -0,0 +1,45 @@
+
+PROGRAMS = tjdtodate unixtodate datetounix mjdtodate datetomjd wintounix
+
+OBJECTS = $(PROGRAMS:=.o)
+MANPAGES = $(PROGRAMS:=.1)
+
+DESTBIN = $(HOME)/bin
+DESTMAN = $(HOME)/man/man1
+
+all: $(PROGRAMS)
+	$(MAKE) man
+
+man: $(MANPAGES)
+
+$(MANPAGES): $(PROGRAMS)
+	pod2man -c "Date utilities" $(@:.1=.c) $@
+
+tjdtodate: tjdtodate.c
+	gcc -o tjdtodate -g -Wall tjdtodate.c
+
+unixtodate: unixtodate.c
+	gcc -o unixtodate -g -Wall unixtodate.c
+
+datetounix: datetounix.c
+	gcc -o datetounix -g -Wall datetounix.c
+
+mjdtodate: mjdtodate.c
+	gcc -o mjdtodate -g -Wall mjdtodate.c
+
+datetomjd: datetomjd.c
+	gcc -o datetomjd -g -Wall datetomjd.c
+
+wintounix: wintounix.c
+	gcc -o wintounix -g -Wall wintounix.c
+
+install:
+	test -d $(DESTBIN) || mkdir -p $(DESTBIN)
+	cp $(PROGRAMS) $(DESTBIN)
+	test -f $(DESTMAN) || mkdir -p $(DESTMAN)
+	cp $(MANPAGES) $(DESTMAN)
+
+clean:
+	rm -f $(PROGRAMS)
+	rm -f $(OBJECTS)
+	rm -f $(MANPAGES)

datetomjd.c

@@ -0,0 +1,104 @@
+/****************************************************************************
+ *
+ *    Copyright (C) 2011  Peter W. Draper ([email protected])
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License along
+ *    with this program; if not, write to the Free Software Foundation, Inc.,
+ *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ ****************************************************************************/
+/*+
+
+=pod
+
+=head1 NAME
+
+datetomjd
+
+=head1 SYNOPSIS
+
+datetomjd now
+
+datetomjd <date_and_time>
+
+=head1 DESCRIPTION
+
+Converts a UT date and time or the current second ("now") to a Modified Julian
+Date.
+
+If given the date and time should be in "YYYY-MM-DD HH:MM:SS.SS" format.
+
+=head1 AUTHOR
+
+Peter W. Draper: 10-JUN-2011
+
+Durham University
+
+=cut
+
+-*/
+
+/*  Include files */
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <unistd.h>
+#include <time.h>
+#include <string.h>
+
+/*  Date of the Unix epoch as a Modified Julian Date. */
+#define MJD_EPOCH 40587
+
+/*  Number of seconds per day. */
+#define SECS_PER_DAY (60 * 60 * 24)
+
+/*  Maximum length of time string. */
+#define BUFLEN 64
+
+/**
+ *  Main routine.
+ */
+int main( int argc, char *argv[] )
+{
+    double mjd;                    /*  Modified Julian Date */
+    time_t unixsecs;               /*  Seconds since the UNIX epoch */
+    struct tm utc;                 /*  UTC time struct */
+
+    /*  Get the command-line value. */
+    if ( argc != 2 ) {
+        printf( "Usage: %s now\n" 
+                "       %s 'YYYY-MM-DD HH:MM:SS.SS'\n", argv[0], argv[0] );
+        return 1;
+    }
+
+    /*  Do we want "now"? */
+    if ( strncmp( argv[1], "now", 3 ) == 0 ) {
+
+        /*  Seconds of the UNIX epoch. */
+        unixsecs = time( NULL );
+    }
+    else {
+        /*  Convert formatted time into a struct. */
+        if ( strptime( argv[1], "%Y-%m-%d %H:%M:%S", &utc ) == NULL ) {
+            printf( "Failed to convert date (%s)\n", argv[1] );
+            return 1;
+        }
+
+        /*  Seconds since the UNIX epoch. */
+        unixsecs = timegm( &utc );
+    }
+
+    /*  MJD. */
+    mjd = ( unixsecs / SECS_PER_DAY ) + MJD_EPOCH;
+    printf( "MJD: %g\n", mjd );
+    return 1;
+}

datetounix.c

@@ -0,0 +1,94 @@
+/****************************************************************************
+ *
+ *    Copyright (C) 2011  Peter W. Draper ([email protected])
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License along
+ *    with this program; if not, write to the Free Software Foundation, Inc.,
+ *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ ****************************************************************************/
+/*+
+
+=pod
+
+=head1 NAME
+
+datetounix
+
+=head1 SYNOPSIS
+
+datetounix now
+
+datetounix <date_and_time>
+
+=head1 DESCRIPTION
+
+Converts a UT date and time or the current second ("now") into the number of
+seconds in the UNIX epoch.
+
+If given the date and time should be in "YYYY-MM-DD HH:MM:SS.SS" format.
+
+=head1 AUTHOR
+
+Peter W. Draper: 10-JUN-2011
+
+Durham University
+
+=cut
+
+-*/
+
+/*  Include files */
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <string.h>
+
+/**
+ *  Main routine.
+ */
+int main( int argc, char *argv[] )
+{
+    time_t unixsecs;               /*  Seconds since the UNIX epoch */
+    struct tm utc;                 /*  UTC time struct */
+
+    /*  Get the command-line value. */
+    if ( argc != 2 ) {
+        printf( "Usage: %s now\n" 
+                "       %s 'YYYY-MM-DD HH:MM:SS.SS'\n", argv[0], argv[0] );
+        return 1;
+    }
+
+    /*  Do we want "now"? */
+    if ( strncmp( argv[1], "now", 3 ) == 0 ) {
+
+        /*  Seconds of the UNIX epoch. */
+        unixsecs = time( NULL );
+    }
+    else {
+        /*  Convert formatted time into a struct. */
+        if ( strptime( argv[1], "%Y-%m-%d %H:%M:%S", &utc ) == NULL ) {
+            printf( "Failed to convert date (%s)\n", argv[1] );
+            return 1;
+        }
+
+        /*  Seconds since the UNIX epoch. */
+        unixsecs = timegm( &utc );
+    }
+
+    /*  Get UNIX ticks. */
+    printf( "Unix ticks = %ld\n", unixsecs );
+    return 0;
+}