243 lines
7.4 KiB
C
243 lines
7.4 KiB
C
/*-
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char sccsid[] = "@(#)ex_bang.c 8.34 (Berkeley) 8/17/94";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/time.h>
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#include <bitstring.h>
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#include <errno.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#include "compat.h"
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#include <db.h>
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#include <regex.h>
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#include "vi.h"
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#include "excmd.h"
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#include "../sex/sex_screen.h"
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/*
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* ex_bang -- :[line [,line]] ! command
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*
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* Pass the rest of the line after the ! character to the program named by
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* the O_SHELL option.
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*
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* Historical vi did NOT do shell expansion on the arguments before passing
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* them, only file name expansion. This means that the O_SHELL program got
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* "$t" as an argument if that is what the user entered. Also, there's a
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* special expansion done for the bang command. Any exclamation points in
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* the user's argument are replaced by the last, expanded ! command.
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*
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* There's some fairly amazing slop in this routine to make the different
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* ways of getting here display the right things. It took a long time to
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* get it right (wrong?), so be careful.
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*/
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int
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ex_bang(sp, ep, cmdp)
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SCR *sp;
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EXF *ep;
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EXCMDARG *cmdp;
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{
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enum filtertype ftype;
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ARGS *ap;
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EX_PRIVATE *exp;
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MARK rm;
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recno_t lno;
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size_t blen;
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int rval;
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char *bp, *msg;
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ap = cmdp->argv[0];
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if (ap->len == 0) {
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msgq(sp, M_ERR, "Usage: %s", cmdp->cmd->usage);
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return (1);
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}
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/* Set the last bang command. */
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exp = EXP(sp);
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if (exp->lastbcomm != NULL)
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free(exp->lastbcomm);
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if ((exp->lastbcomm = strdup(ap->bp)) == NULL) {
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msgq(sp, M_SYSERR, NULL);
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return (1);
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}
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/*
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* If the command was modified by the expansion, we redisplay it.
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* Redisplaying it in vi mode is tricky, and handled separately
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* in each case below. If we're in ex mode, it's easy, so we just
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* do it here.
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*/
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bp = NULL;
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if (F_ISSET(cmdp, E_MODIFY) && !F_ISSET(sp, S_EXSILENT)) {
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if (IN_EX_MODE(sp)) {
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(void)ex_printf(EXCOOKIE, "!%s\n", ap->bp);
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(void)ex_fflush(EXCOOKIE);
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}
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/*
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* Vi: Display the command if modified. Historic vi displayed
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* the command if it was modified due to file name and/or bang
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* expansion. If piping lines, it was immediately overwritten
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* by any error or line change reporting. We don't the user to
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* have to page through the responses, so we only post it until
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* it's erased by something else. Otherwise, pass it on to the
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* ex_exec_proc routine to display after the screen has been
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* cleaned up.
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*/
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if (IN_VI_MODE(sp)) {
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GET_SPACE_RET(sp, bp, blen, ap->len + 3);
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bp[0] = '!';
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memmove(bp + 1, ap->bp, ap->len);
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bp[ap->len + 1] = '\n';
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bp[ap->len + 2] = '\0';
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}
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}
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/*
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* If addresses were specified, pipe lines from the file through the
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* command.
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*
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* Historically, vi lines were replaced by both the stdout and stderr
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* lines of the command, but ex by only the stdout lines. This makes
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* no sense to me, so nvi makes it consistent for both, and matches
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* vi's historic behavior.
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*/
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if (cmdp->addrcnt != 0) {
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/* Autoprint is set historically, even if the command fails. */
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F_SET(exp, EX_AUTOPRINT);
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/* Vi gets a busy message. */
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if (bp != NULL)
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(void)sp->s_busy(sp, bp);
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/*
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* !!!
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* Historical vi permitted "!!" in an empty file. When it
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* happens, we get called with two addresses of 1,1 and a
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* bad attitude. The simple solution is to turn it into a
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* FILTER_READ operation, but that means that we don't put
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* an empty line into the default cut buffer as did historic
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* vi. Tough.
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*/
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ftype = FILTER;
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if (cmdp->addr1.lno == 1 && cmdp->addr2.lno == 1) {
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if (file_lline(sp, ep, &lno))
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return (1);
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if (lno == 0) {
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cmdp->addr1.lno = cmdp->addr2.lno = 0;
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ftype = FILTER_READ;
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}
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}
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rval = filtercmd(sp, ep,
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&cmdp->addr1, &cmdp->addr2, &rm, ap->bp, ftype);
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/*
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* If in vi mode, move to the first nonblank.
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*
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* !!!
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* Historic vi wasn't consistent in this area -- if you used
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* a forward motion it moved to the first nonblank, but if you
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* did a backward motion it didn't. And, if you followed a
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* backward motion with a forward motion, it wouldn't move to
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* the nonblank for either. Going to the nonblank generally
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* seems more useful, so we do it.
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*/
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if (rval == 0) {
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sp->lno = rm.lno;
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if (IN_VI_MODE(sp)) {
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sp->cno = 0;
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(void)nonblank(sp, ep, sp->lno, &sp->cno);
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}
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}
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goto ret2;
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}
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/*
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* If no addresses were specified, run the command. If the file
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* has been modified and autowrite is set, write the file back.
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* If the file has been modified, autowrite is not set and the
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* warn option is set, tell the user about the file.
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*/
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msg = NULL;
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if (F_ISSET(ep, F_MODIFIED))
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if (O_ISSET(sp, O_AUTOWRITE)) {
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if (file_write(sp, ep, NULL, NULL, NULL, FS_ALL)) {
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rval = 1;
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goto ret1;
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}
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} else if (O_ISSET(sp, O_WARN) && !F_ISSET(sp, S_EXSILENT))
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msg = "File modified since last write.\n";
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/* Run the command. */
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rval = ex_exec_proc(sp, ap->bp, bp, msg);
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/* Vi requires user permission to continue. */
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if (IN_VI_MODE(sp))
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F_SET(sp, S_CONTINUE);
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ret2: if (IN_EX_MODE(sp)) {
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/*
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* Put ex error messages out so they aren't confused with
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* the autoprint output.
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*/
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if (rval)
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(void)sex_refresh(sp, sp->ep);
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/* Ex terminates with a bang, even if the command fails. */
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if (!F_ISSET(sp, S_EXSILENT))
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(void)write(STDOUT_FILENO, "!\n", 2);
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}
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/* Free the extra space. */
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ret1: if (bp != NULL)
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FREE_SPACE(sp, bp, blen);
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/*
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* XXX
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* The ! commands never return an error, so that autoprint always
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* happens in the ex parser.
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*/
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return (0);
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}
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