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	tAdded command line argument parsing - ns2dfd - 2D finite difference Navier Sto…
	git clone git://src.adamsgaard.dk/ns2dfd
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	---
	commit 712b7d25f92ae5ecd752f39c2d1578a39d973457
	parent 323315d2db64d9b54393d45009b1f8ad3c75930c
	Author: Anders Damsgaard <[email protected]>
	Date: Sun, 2 Mar 2014 20:31:10 +0100

	Added command line argument parsing

	Diffstat:
	M src/main.c \| 47 ++++++++++++++++++++++++++++-…

	1 file changed, 43 insertions(+), 4 deletions(-)
	---
	diff --git a/src/main.c b/src/main.c
	t@@ -1,7 +1,12 @@
	#include <stdio.h>
	+#include <stdlib.h>
	+#include <ctype.h>
	+#include <unistd.h>
	#include "file_io.h"
	#include "utility.h"

	+#define VERSION 0.1
	+
	int main(int argc, char** argv)
	{
	double t, t_end, tau;
	t@@ -13,10 +18,44 @@ int main(int argc, char** argv)
	int nx, ny;
	double P, U, **V;

	- read_file("unnamed.dat", &t, &t_end, &tau, &itermax,
	- &epsilon, &omega, &gamma,
	- &gx, &gy, &re, &w_left, &w_right, &w_top, &w_bottom,
	- &dx, &dy, &nx, &ny, &P, &U, &V);
	+ int c;
	+ while ((c = getopt(argc, argv, "hv")) != -1)
	+ switch (c)
	+ {
	+ case 'h':
	+ printf("usage: %s [OPTIONS] FILENAME\n"
	+ "where FILENAME is a valid input file.\n"
	+ "-h\tDisplay help\n"
	+ "-v\tDisplay version information\n", argv[0]);
	+ return 0;
	+ break;
	+ case 'v':
	+ printf("%s: Navier Stokes solver in 2D using finite differences, "
	+ "version %.1f\n"
	+ "Written by Anders Damsgaard, "
	+ "https://github.com/anders-dc/ns2dfd\n", argv[0], VERSION);
	+ return 0;
	+ break;
	+ case '?':
	+ if (isprint(optopt))
	+ fprintf(stderr, "Unknown option `-%c`.\n", optopt);
	+ else
	+ fprintf(stderr, "Unknown option character `\\x%x`.\n", optopt);
	+ return 1;
	+
	+ default:
	+ abort();
	+ }
	+
	+ if (optind == argc - 1) {
	+ read_file(argv[optind], &t, &t_end, &tau, &itermax,
	+ &epsilon, &omega, &gamma,
	+ &gx, &gy, &re, &w_left, &w_right, &w_top, &w_bottom,
	+ &dx, &dy, &nx, &ny, &P, &U, &V);
	+ } else {
	+ fprintf(stderr, "%s: no input file specified.\n", argv[0]);
	+ return 1;
	+ }

	printf("omega = %f\n", omega);
	printf("P[0][0] = %f\n", P[0][0]);