edhup.c

早期freebsd实现

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rodney Ruddock of the University of Guelph.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)edhup.c	8.1 (Berkeley) 5/31/93";
#endif /* not lint */

#include <sys/types.h>

#include <limits.h>
#include <regex.h>
#include <setjmp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#ifdef DBI
#include <db.h>
#endif

#include "ed.h"
#include "extern.h"

/*
 * If a SIGHUP is received then user contact is severed. Try, if possible,
 * to save the buffer. But be nice and don't save over remembered filename
 * (you can figure out why, can't you?).  The buffer is saved in a file
 * named "ed.hup" in the directory that ed was started-up in.  If a write
 * cannot be made to that directory (say because it is read-only) then try
 * writting "ed.hup" in the user's $HOME directory. Then exit.
 */
__dead void
do_hup()
{
	char l_filename[FILENAME_LEN], *l_temp;
	FILE *l_fp;

	sigspecial++;
	if (change_flag == 0)
		exit(exit_code+2);		/* No need to save buffer contents. */
	if ((l_fp = fopen("ed.hup", "w")) == NULL) {
		/* Try writting ed.hup to the $HOME directory instead. */
		l_temp = getenv("HOME");
		if ((l_temp == NULL) || ((strlen(l_temp) + 7) > FILENAME_LEN))
			exit(exit_code+2);
		strcpy(l_filename, l_temp);
		strcat(l_filename, "/ed.hup");
		if ((l_fp = fopen(l_filename, "w")) == NULL)
			exit(exit_code+2);		/* We tried... */
	}
	edwrite(l_fp, top, bottom);
	fclose(l_fp);
#ifdef STDIO
	fclose(fhtmp);
	unlink(template);
#endif
#ifdef DBI
	(dbhtmp->close) (dbhtmp);
	unlink(template);
#endif
	exit(exit_code+2);				/* Hangup */
}