4.4BSD/usr/src/usr.bin/f77/libU77/ftell_.c

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/*-
 * Copyright (c) 1980 The Regents of the University of California.
 * All rights reserved.
 *
 * This module is believed to contain source code proprietary to AT&T.
 * Use and redistribution is subject to the Berkeley Software License
 * Agreement and your Software Agreement with AT&T (Western Electric).
 */

#ifndef lint
static char sccsid[] = "@(#)ftell_.c	5.2 (Berkeley) 4/12/91";
#endif /* not lint */

/*
 * return current file position
 *
 * calling sequence:
 *	integer curpos, ftell
 *	curpos = ftell(lunit)
 * where:
 *	lunit is an open logical unit
 *	curpos will be the current offset in bytes from the start of the
 *		file associated with that logical unit
 *		or a (negative) system error code.
 */

#include	"../libI77/fiodefs.h"
#include	"../libI77/f_errno.h"

extern unit units[];

long ftell_(lu)
long *lu;
{
	if (*lu < 0 || *lu >= MXUNIT)
		return(-(long)(errno=F_ERUNIT));
	if (!units[*lu].ufd)
		return(-(long)(errno=F_ERNOPEN));
	return(ftell(units[*lu].ufd));
}