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	tgranulargrain.c - granular - granular dynamics simulation
	git clone git://src.adamsgaard.dk/granular
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	---
	tgranulargrain.c (1055B)
	---
	1 #include <stdlib.h>
	2 #include <err.h>
	3 #include <unistd.h>
	4 #include "granular.h"
	5 #include "arg.h"
	6
	7 char *argv0;
	8
	9 static void
	10 usage(void)
	11 {
	12 errx(1, "usage: %s "
	13 "[-d diameter] "
	14 "[-f] "
	15 "[-h] "
	16 "[-R] "
	17 "[-u vx] "
	18 "[-v vy] "
	19 "[-w vz] "
	20 "[-x x] "
	21 "[-y y] "
	22 "[-z z]", argv0);
	23 }
	24
	25 int
	26 main(int argc, char *argv[])
	27 {
	28 struct grain g = grain_new();
	29
	30 #ifdef __OpenBSD__
	31 if (pledge("stdio", NULL) == -1)
	32 err(2, "pledge");
	33 #endif
	34
	35 ARGBEGIN {
	36 case 'd':
	37 g.diameter = atof(EARGF(usage()));
	38 break;
	39 case 'f':
	40 g.fixed = 1;
	41 break;
	42 case 'h':
	43 usage();
	44 break;
	45 case 'R':
	46 g.rotating = 0;
	47 break;
	48 case 'u':
	49 g.vel[0] = atof(EARGF(usage()));
	50 break;
	51 case 'v':
	52 g.vel[1] = atof(EARGF(usage()));
	53 break;
	54 case 'w':
	55 g.vel[2] = atof(EARGF(usage()));
	56 break;
	57 case 'x':
	58 g.pos[0] = atof(EARGF(usage()));
	59 break;
	60 case 'y':
	61 g.pos[1] = atof(EARGF(usage()));
	62 break;
	63 case 'z':
	64 g.pos[2] = atof(EARGF(usage()));
	65 break;
	66 default:
	67 usage();
	68 } ARGEND;
	69
	70 if (argc > 1)
	71 usage();
	72
	73 grain_print(stdout, &g);
	74
	75 return 0;
	76 }