4.1cBSD/usr/src/usr.lib/libpc/READ8.c

/* Copyright (c) 1979 Regents of the University of California */

static char sccsid[] = "@(#)READ8.c 1.5 4/9/82";

#include "h00vars.h"
#include <errno.h>
extern int errno;

double
READ8(curfile)

	register struct iorec	*curfile;
{
	double			data;
	int			retval;

	if (curfile->funit & FWRITE) {
		ERROR("%s: Attempt to read, but open for writing\n",
			curfile->pfname);
		return;
	}
	UNSYNC(curfile);
	errno = 0;
	retval = fscanf(curfile->fbuf, "%lf", &data);
	if (retval == EOF) {
		ERROR("%s: Tried to read past end of file\n", curfile->pfname);
		return;
	}
	if (retval == 0) {
		ERROR("%s: Bad data found on real read\n", curfile->pfname);
		return;
	}
	if (errno == ERANGE) {
		if (data == 0.0)
			ERROR("%s: Underflow on real read\n", curfile->pfname);
		else
			ERROR("%s: Overflow on real read\n", curfile->pfname);
		return;
	}
	if (errno != 0) {
		PERROR(curfile->pfname);
		return;
	}
	curfile->funit &= ~EOLN;
	curfile->funit |= SYNC;
	return data;
}