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/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* 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 const char sccsid[] = "@(#)ex_bang.c 8.34 (Berkeley) 8/17/94";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "compat.h"
#include <db.h>
#include <regex.h>
#include "vi.h"
#include "excmd.h"
#include "../sex/sex_screen.h"
/*
* ex_bang -- :[line [,line]] ! command
*
* Pass the rest of the line after the ! character to the program named by
* the O_SHELL option.
*
* Historical vi did NOT do shell expansion on the arguments before passing
* them, only file name expansion. This means that the O_SHELL program got
* "$t" as an argument if that is what the user entered. Also, there's a
* special expansion done for the bang command. Any exclamation points in
* the user's argument are replaced by the last, expanded ! command.
*
* There's some fairly amazing slop in this routine to make the different
* ways of getting here display the right things. It took a long time to
* get it right (wrong?), so be careful.
*/
int
ex_bang(sp, ep, cmdp)
SCR *sp;
EXF *ep;
EXCMDARG *cmdp;
{
enum filtertype ftype;
ARGS *ap;
EX_PRIVATE *exp;
MARK rm;
recno_t lno;
size_t blen;
int rval;
char *bp, *msg;
ap = cmdp->argv[0];
if (ap->len == 0) {
msgq(sp, M_ERR, "Usage: %s", cmdp->cmd->usage);
return (1);
}
/* Set the last bang command. */
exp = EXP(sp);
if (exp->lastbcomm != NULL)
free(exp->lastbcomm);
if ((exp->lastbcomm = strdup(ap->bp)) == NULL) {
msgq(sp, M_SYSERR, NULL);
return (1);
}
/*
* If the command was modified by the expansion, we redisplay it.
* Redisplaying it in vi mode is tricky, and handled separately
* in each case below. If we're in ex mode, it's easy, so we just
* do it here.
*/
bp = NULL;
if (F_ISSET(cmdp, E_MODIFY) && !F_ISSET(sp, S_EXSILENT)) {
if (IN_EX_MODE(sp)) {
(void)ex_printf(EXCOOKIE, "!%s\n", ap->bp);
(void)ex_fflush(EXCOOKIE);
}
/*
* Vi: Display the command if modified. Historic vi displayed
* the command if it was modified due to file name and/or bang
* expansion. If piping lines, it was immediately overwritten
* by any error or line change reporting. We don't the user to
* have to page through the responses, so we only post it until
* it's erased by something else. Otherwise, pass it on to the
* ex_exec_proc routine to display after the screen has been
* cleaned up.
*/
if (IN_VI_MODE(sp)) {
GET_SPACE_RET(sp, bp, blen, ap->len + 3);
bp[0] = '!';
memmove(bp + 1, ap->bp, ap->len);
bp[ap->len + 1] = '\n';
bp[ap->len + 2] = '\0';
}
}
/*
* If addresses were specified, pipe lines from the file through the
* command.
*
* Historically, vi lines were replaced by both the stdout and stderr
* lines of the command, but ex by only the stdout lines. This makes
* no sense to me, so nvi makes it consistent for both, and matches
* vi's historic behavior.
*/
if (cmdp->addrcnt != 0) {
/* Autoprint is set historically, even if the command fails. */
F_SET(exp, EX_AUTOPRINT);
/* Vi gets a busy message. */
if (bp != NULL)
(void)sp->s_busy(sp, bp);
/*
* !!!
* Historical vi permitted "!!" in an empty file. When it
* happens, we get called with two addresses of 1,1 and a
* bad attitude. The simple solution is to turn it into a
* FILTER_READ operation, but that means that we don't put
* an empty line into the default cut buffer as did historic
* vi. Tough.
*/
ftype = FILTER;
if (cmdp->addr1.lno == 1 && cmdp->addr2.lno == 1) {
if (file_lline(sp, ep, &lno))
return (1);
if (lno == 0) {
cmdp->addr1.lno = cmdp->addr2.lno = 0;
ftype = FILTER_READ;
}
}
rval = filtercmd(sp, ep,
&cmdp->addr1, &cmdp->addr2, &rm, ap->bp, ftype);
/*
* If in vi mode, move to the first nonblank.
*
* !!!
* Historic vi wasn't consistent in this area -- if you used
* a forward motion it moved to the first nonblank, but if you
* did a backward motion it didn't. And, if you followed a
* backward motion with a forward motion, it wouldn't move to
* the nonblank for either. Going to the nonblank generally
* seems more useful, so we do it.
*/
if (rval == 0) {
sp->lno = rm.lno;
if (IN_VI_MODE(sp)) {
sp->cno = 0;
(void)nonblank(sp, ep, sp->lno, &sp->cno);
}
}
goto ret2;
}
/*
* If no addresses were specified, run the command. If the file
* has been modified and autowrite is set, write the file back.
* If the file has been modified, autowrite is not set and the
* warn option is set, tell the user about the file.
*/
msg = NULL;
if (F_ISSET(ep, F_MODIFIED))
if (O_ISSET(sp, O_AUTOWRITE)) {
if (file_write(sp, ep, NULL, NULL, NULL, FS_ALL)) {
rval = 1;
goto ret1;
}
} else if (O_ISSET(sp, O_WARN) && !F_ISSET(sp, S_EXSILENT))
msg = "File modified since last write.\n";
/* Run the command. */
rval = ex_exec_proc(sp, ap->bp, bp, msg);
/* Vi requires user permission to continue. */
if (IN_VI_MODE(sp))
F_SET(sp, S_CONTINUE);
ret2: if (IN_EX_MODE(sp)) {
/*
* Put ex error messages out so they aren't confused with
* the autoprint output.
*/
if (rval)
(void)sex_refresh(sp, sp->ep);
/* Ex terminates with a bang, even if the command fails. */
if (!F_ISSET(sp, S_EXSILENT))
(void)write(STDOUT_FILENO, "!\n", 2);
}
/* Free the extra space. */
ret1: if (bp != NULL)
FREE_SPACE(sp, bp, blen);
/*
* XXX
* The ! commands never return an error, so that autoprint always
* happens in the ex parser.
*/
return (0);
}
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