usr.bin/vi/ex/ex_bang.c

/*-
 * 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 char sccsid[] = "@(#)ex_bang.c   8.24 (Berkeley) 3/14/94";
#endif /* not lint */

#include <sys/types.h>
#include <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 <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 get 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);
        }

        /* Swap commands. */
        exp = EXP(sp);
        if (exp->lastbcomm != NULL)
                FREE(exp->lastbcomm, strlen(exp->lastbcomm) + 1);
        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)) {
                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 + 2);
                        bp[0] = '!';
                        memmove(bp + 1, ap->bp, ap->len + 1);
                }
        }

        /*
         * If addresses were specified, pipe lines from the file through
         * the command.
         */
        if (cmdp->addrcnt != 0) {
                if (bp != NULL) {
                        (void)sp->s_busy(sp, bp);
                        FREE_SPACE(sp, bp, blen);
                }
                /*
                 * !!!
                 * Historical vi permitted "!!" in an empty file.  When it
                 * happens, we get called with two addresses of 1,1 and a
                 * bad attitude.
                 */
                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;
                        }
                }
                if (filtercmd(sp, ep,
                    &cmdp->addr1, &cmdp->addr2, &rm, ap->bp, ftype))
                        return (1);
                sp->lno = rm.lno;
                F_SET(exp, EX_AUTOPRINT);
                return (0);
        }

        /*
         * 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 = "\n";
        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 ret;
                        }
                } else if (O_ISSET(sp, O_WARN))
                        if (IN_VI_MODE(sp) && F_ISSET(cmdp, E_MODIFY))
                                msg = "\nFile modified since last write.\n";
                        else
                                msg = "File modified since last write.\n";

        /* Run the command. */
        rval = ex_exec_proc(sp, ap->bp, bp, msg);

        /* Ex terminates with a bang. */
        if (IN_EX_MODE(sp))
                (void)write(STDOUT_FILENO, "!\n", 2);

        /* Vi requires user permission to continue. */
        if (IN_VI_MODE(sp))
                F_SET(sp, S_CONTINUE);

        /* Free the extra space. */
ret:    if (bp != NULL)
                FREE_SPACE(sp, bp, blen);

        return (rval);
}