external/bsd/nvi/dist/ex/ex_bang.c

   1 /*      $NetBSD: ex_bang.c,v 1.3 2014/01/26 21:43:45 christos Exp $ */
   2 /*-
   3  * Copyright (c) 1992, 1993, 1994
   4  *      The Regents of the University of California.  All rights reserved.
   5  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   6  *      Keith Bostic.  All rights reserved.
   7  *
   8  * See the LICENSE file for redistribution information.
   9  */
  10
  11 #include "config.h"
  12
  13 #include <sys/cdefs.h>
  14 #if 0
  15 #ifndef lint
  16 static const char sccsid[] = "Id: ex_bang.c,v 10.36 2001/06/25 15:19:14 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:14 ";
  17 #endif /* not lint */
  18 #else
  19 __RCSID("$NetBSD: ex_bang.c,v 1.3 2014/01/26 21:43:45 christos Exp $");
  20 #endif
  21
  22 #include <sys/types.h>
  23 #include <sys/queue.h>
  24 #include <sys/time.h>
  25
  26 #include <bitstring.h>
  27 #include <errno.h>
  28 #include <limits.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <unistd.h>
  33
  34 #include "../common/common.h"
  35 #include "../vi/vi.h"
  36
  37 /*
  38  * ex_bang -- :[line [,line]] ! command
  39  *
  40  * Pass the rest of the line after the ! character to the program named by
  41  * the O_SHELL option.
  42  *
  43  * Historical vi did NOT do shell expansion on the arguments before passing
  44  * them, only file name expansion.  This means that the O_SHELL program got
  45  * "$t" as an argument if that is what the user entered.  Also, there's a
  46  * special expansion done for the bang command.  Any exclamation points in
  47  * the user's argument are replaced by the last, expanded ! command.
  48  *
  49  * There's some fairly amazing slop in this routine to make the different
  50  * ways of getting here display the right things.  It took a long time to
  51  * get it right (wrong?), so be careful.
  52  *
  53  * PUBLIC: int ex_bang __P((SCR *, EXCMD *));
  54  */
  55 int
  56 ex_bang(SCR *sp, EXCMD *cmdp)
  57 {
  58         enum filtertype ftype;
  59         ARGS *ap;
  60         EX_PRIVATE *exp;
  61         MARK rm;
  62         db_recno_t lno;
  63         const char *msg;
  64         const char *np;
  65         size_t nlen;
  66
  67         ap = cmdp->argv[0];
  68         if (ap->len == 0) {
  69                 ex_emsg(sp, cmdp->cmd->usage, EXM_USAGE);
  70                 return (1);
  71         }
  72
  73         /* Set the "last bang command" remembered value. */
  74         exp = EXP(sp);
  75         if (exp->lastbcomm != NULL)
  76                 free(exp->lastbcomm);
  77         if ((exp->lastbcomm = v_wstrdup(sp, ap->bp, ap->len)) == NULL) {
  78                 msgq(sp, M_SYSERR, NULL);
  79                 return (1);
  80         }
  81
  82         /*
  83          * If the command was modified by the expansion, it was historically
  84          * redisplayed.
  85          */
  86         if (F_ISSET(cmdp, E_MODIFY) && !F_ISSET(sp, SC_EX_SILENT)) {
  87                 /*
  88                  * Display the command if modified.  Historic ex/vi displayed
  89                  * the command if it was modified due to file name and/or bang
  90                  * expansion.  If piping lines in vi, it would be immediately
  91                  * overwritten by any error or line change reporting.
  92                  */
  93                 if (F_ISSET(sp, SC_VI))
  94                         vs_update(sp, "!", ap->bp);
  95                 else {
  96                         INT2CHAR(sp, ap->bp, ap->len+1, np, nlen);
  97                         (void)ex_printf(sp, "!%s\n", np);
  98                         (void)ex_fflush(sp);
  99                 }
 100         }
 101
 102         /*
 103          * If no addresses were specified, run the command.  If there's an
 104          * underlying file, it's been modified and autowrite is set, write
 105          * the file back.  If the file has been modified, autowrite is not
 106          * set and the warn option is set, tell the user about the file.
 107          */
 108         if (cmdp->addrcnt == 0) {
 109                 msg = NULL;
 110                 if (sp->ep != NULL && F_ISSET(sp->ep, F_MODIFIED)) {
 111                         if (O_ISSET(sp, O_AUTOWRITE)) {
 112                                 if (file_aw(sp, FS_ALL))
 113                                         return (0);
 114                         } else if (O_ISSET(sp, O_WARN) &&
 115                             !F_ISSET(sp, SC_EX_SILENT))
 116                                 msg = msg_cat(sp,
 117                                     "303|File modified since last write.",
 118                                     NULL);
 119                 }
 120
 121                 /* If we're still in a vi screen, move out explicitly. */
 122                 INT2CHAR(sp, ap->bp, ap->len+1, np, nlen);
 123                 (void)ex_exec_proc(sp,
 124                     cmdp, np, msg, !F_ISSET(sp, SC_EX | SC_SCR_EXWROTE));
 125         }
 126
 127         /*
 128          * If addresses were specified, pipe lines from the file through the
 129          * command.
 130          *
 131          * Historically, vi lines were replaced by both the stdout and stderr
 132          * lines of the command, but ex lines by only the stdout lines.  This
 133          * makes no sense to me, so nvi makes it consistent for both, and
 134          * matches vi's historic behavior.
 135          */
 136         else {
 137                 NEEDFILE(sp, cmdp);
 138
 139                 /* Autoprint is set historically, even if the command fails. */
 140                 F_SET(cmdp, E_AUTOPRINT);
 141
 142                 /*
 143                  * !!!
 144                  * Historical vi permitted "!!" in an empty file.  When this
 145                  * happens, we arrive here with two addresses of 1,1 and a
 146                  * bad attitude.  The simple solution is to turn it into a
 147                  * FILTER_READ operation, with the exception that stdin isn't
 148                  * opened for the utility, and the cursor position isn't the
 149                  * same.  The only historic glitch (I think) is that we don't
 150                  * put an empty line into the default cut buffer, as historic
 151                  * vi did.  Imagine, if you can, my disappointment.
 152                  */
 153                 ftype = FILTER_BANG;
 154                 if (cmdp->addr1.lno == 1 && cmdp->addr2.lno == 1) {
 155                         if (db_last(sp, &lno))
 156                                 return (1);
 157                         if (lno == 0) {
 158                                 cmdp->addr1.lno = cmdp->addr2.lno = 0;
 159                                 ftype = FILTER_RBANG;
 160                         }
 161                 }
 162                 (void)ex_filter(sp, cmdp,
 163                     &cmdp->addr1, &cmdp->addr2, &rm, ap->bp, ftype);
 164
 165                 /*
 166                  * If in vi mode, move to the first nonblank.
 167                  *
 168                  * !!!
 169                  * Historic vi wasn't consistent in this area -- if you used
 170                  * a forward motion it moved to the first nonblank, but if you
 171                  * did a backward motion it didn't.  And, if you followed a
 172                  * backward motion with a forward motion, it wouldn't move to
 173                  * the nonblank for either.  Going to the nonblank generally
 174                  * seems more useful and consistent, so we do it.
 175                  */
 176                 sp->lno = rm.lno;
 177                 if (F_ISSET(sp, SC_VI)) {
 178                         sp->cno = 0;
 179                         (void)nonblank(sp, sp->lno, &sp->cno);
 180                 } else
 181                         sp->cno = rm.cno;
 182         }
 183
 184         /* Ex terminates with a bang, even if the command fails. */
 185         if (!F_ISSET(sp, SC_VI) && !F_ISSET(sp, SC_EX_SILENT))
 186                 (void)ex_puts(sp, "!\n");
 187
 188         /*
 189          * XXX
 190          * The ! commands never return an error, so that autoprint always
 191          * happens in the ex parser.
 192          */
 193         return (0);
 194 }