readc.c

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· C语言 代码 · 共 27 行

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

static char sccsid[] = "@(#)READC.c 1.2 6/10/81";

#include "h00vars.h"

char
READC(curfile)

	register struct iorec	*curfile;
{
	char			data;

	if (curfile->funit & FWRITE) {
		ERROR("%s: Attempt to read, but open for writing\n",
			curfile->pfname);
		return;
	}
	IOSYNC(curfile);
	if (curfile->funit & EOFF) {
		ERROR("%s: Tried to read past end of file\n", curfile->pfname);
		return;
	}
	curfile->funit |= SYNC;
	return *curfile->fileptr;
}