output.c

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

#include "astro.h"

void
output(char *s, Obj1 *p)
{

	if(s == 0)
		print(" SAO %5ld", sao);
	else
		print("%10s", s);
	print(" %R %D %9.4f %9.4f %9.4f",
		p->ra, p->decl2, p->az, p->el, p->semi2);
	if(s == osun.name || s == omoon.name)
		print(" %7.4f", p->mag);
	print("\n");
}

int
Rconv(Fmt *f)
{
	double v;
	int h, m, c;

	v = va_arg(f->args, double);
	v = fmod(v*12/pi, 24);		/* now hours */
	h = floor(v);
	v = fmod((v-h)*60, 60);		/* now leftover minutes */
	m = floor(v);
	v = fmod((v-m)*60, 60);		/* now leftover seconds */
	c = floor(v);
	return fmtprint(f, "%2dh%.2dm%.2ds", h, m, c);
}

int
Dconv(Fmt *f1)
{
	double v;
	int h, m, c, f;

	v = va_arg(f1->args, double);
	v = fmod(v/radian, 360);	/* now degrees */
	f = 0;
	if(v > 180) {
		v = 360 - v;
		f = 1;
	}
	h = floor(v);
	v = fmod((v-h)*60, 60);		/* now leftover minutes */
	m = floor(v);
	v = fmod((v-m)*60, 60);		/* now leftover seconds */
	c = floor(v);
	return fmtprint(f1, "%c%.2d°%.2d'%.2d\"", "+-"[f], h, m, c);
}