BSD 4_4 release

[unix-history] / usr / src / contrib / ed / bang.c

/*-
 * 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[] = "@(#)bang.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>

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

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

/*
 * Execute a command in sh (and always sh). For those wondering the
 * proper name for '!' _is_ bang.
 */

void
bang(inputt, errnum)
	FILE *inputt;
	int *errnum;
{
	static int l_cnt_last_pos=0;		/* "!!", l_shellcmd offset */
	static char l_shellcmd[FILENAME_LEN];	/* "!!" */
	static char l_shellcmd2[FILENAME_LEN];	/* "!!" */
	int l_cnt = 0, l_esc=0, l_flag=0;

	memcpy(l_shellcmd, l_shellcmd2, FILENAME_LEN);

	for (;;) {
		ss = getc(inputt);
		l_esc = 0;
		if (ss == '\\') {
			ss = getc(inputt);
			l_esc = 1;
		}
		if (((!l_esc) && (ss == '\n')) || (ss == EOF)) {
			l_shellcmd[l_cnt] = '\0';
			break;
		} else
			if ((ss == '!') && (l_cnt == 0) && (l_esc == 0)) {
				if (l_cnt_last_pos == 0) {
					strcpy(help_msg,
					    "no remembered command");
					*errnum = -1;
					return;
				}
				l_cnt = l_cnt_last_pos;
				l_flag = 1;
			}
			else
				if ((ss == '%') && (l_esc == 0)) {
					if (filename_current) {
						l_shellcmd[l_cnt] = '\0';
						strcat(l_shellcmd,
						    filename_current);
						l_cnt =
						    l_cnt +
						    strlen(filename_current); 
					}
					else {
						strcpy(help_msg,
						    "no current filename");
						*errnum = -1;
						return;
					}
				} else
					l_shellcmd[l_cnt++] = ss;
		if (l_cnt >= FILENAME_LEN) {
			strcpy(help_msg, "shell command too long");
			*errnum = -1;
			return;
		}
	}

	if (l_flag)
		printf("%s\n", l_shellcmd);
	system(l_shellcmd);
	if (explain_flag > 0)	/* for the -s option */
		printf("!\n");
	l_cnt_last_pos = l_cnt;
	memcpy(l_shellcmd2, l_shellcmd, FILENAME_LEN);
	*errnum = 0;
}