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;
}