e.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[] = "@(#)e.c	8.1 (Berkeley) 5/31/93";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>

#include <fcntl.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"

/*
 * Places a new file in the buffer to be editted. The current contents
 * of the buffer are deleted - no undo can be perfomed. A warning is
 * issued once if no write has occurred since the last buffer
 * modification (unless 'E' spec'd).
 */

void
e(inputt, errnum)
	FILE *inputt;
	int *errnum;
{
	int l_which;		/* which is it? 'e' or 'E' */
	char *l_temp;

	l_which = ss;

	l_temp = filename(inputt, errnum);
	if (*errnum == 1) {
		sigspecial++;
		free(filename_current);
		filename_current = l_temp;
		sigspecial--;
		if (sigint_flag && (!sigspecial))
			SIGINT_ACTION;
	} else
		if (*errnum == -2)
			while (((ss = getc(inputt)) != '\n') || (ss == EOF));
		else
			if (*errnum < 0)
				return;
	*errnum = 0;

	/* Note: 'E' will bypass this if stmt., which warns of no save. */
	if ((change_flag == 1L) && (l_which == 'e')) {
		change_flag = 0L;
		strcpy(help_msg, "warning: buffer changes not saved");
		*errnum = -1;
		ungetc('\n', inputt);
		return;
	}
	Start = top;
	End = bottom;
	Start_default = End_default = 0;
	if (Start == NULL && bottom == NULL);
	else {
		ungetc(ss, inputt);
		d(inputt, errnum);	/* delete the whole buffer */
	}

	/* An 'e' clears all traces of last doc'mt, even in 'g'. */
	u_clr_stk();
	if (*errnum < 0)
		return;
	*errnum = 0;
#ifdef STDIO
	if (fhtmp > NULL) {
		fclose(fhtmp);
		unlink(template);
	}
#endif
#ifdef DBI
	if (dbhtmp != NULL) {
		(dbhtmp->close) (dbhtmp);
		unlink(template);
	}
#endif

	name_set = 1;
	e2(inputt, errnum);

	*errnum = 1;
}

/*
 * This is pulled out of e.c to make the "simulated 'e'" at startup easier to
 * handle.
 */
void
e2(inputt, errnum)
	FILE *inputt;
	int *errnum;
{
	char *tmp_path;

	sigspecial++;
#ifndef MEMORY
	if (template == NULL) {
		template = (char *) calloc(FILENAME_LEN, sizeof(char));
		if (template == NULL)
			ed_exit(4);
	}
	/* create the buffer using the method favored at compile time */
	tmp_path = getenv("TMPDIR");
	sprintf(template, "%s/_4.4bsd_ed_XXXXXX", tmp_path ? tmp_path : "/tmp");
	mktemp(template);
#endif
#ifdef STDIO
	fhtmp = fopen(template, "w+");
	if (fhtmp == NULL) {
		ed_exit(5); /* unable to create buffer */
	}
	fwrite("R", sizeof(char), 1, fhtmp);
	file_seek = 0;
#endif
#ifdef DBI
	/* open using btree only, recno will mess things up
	 * because of garbage collection and how recno operates
	 * with delete.
	 */
	dbhtmp = dbopen(template, O_CREAT | O_RDWR,
	    S_IRUSR | S_IWUSR, (DBTYPE) DB_BTREE, NULL);
	if (dbhtmp == NULL) {
		ed_exit(5); /* unable to create buffer */
	}
#endif
	current = top;
	Start = top;
	End = bottom;

	sigspecial--;
	if (sigint_flag &&(!sigspecial))
		SIGINT_ACTION;

	change_flag = 1;
	if (name_set) {
		/* So 'r' knows the filename is already read in. */
		filename_flag = 1;
		r(inputt, errnum);
		gut_num = line_number(bottom) + 512;
		if (gut == NULL) {
			gut = malloc(sizeof(LINE **) * gut_num);
			if (gut == NULL) {
				*errnum = -1;
				strcpy(help_msg, "out of memory error");
				return;
			}
		}
	}
	change_flag = 0;
	*errnum = 1;
}