ex/ex_bang.c

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * %sccs.include.redist.c%
   6  */
   7
   8 #ifndef lint
   9 static char sccsid[] = "$Id: ex_bang.c,v 8.22 1993/12/29 09:50:48 bostic Exp $ (Berkeley) $Date: 1993/12/29 09:50:48 $";
  10 #endif /* not lint */
  11
  12 #include <sys/types.h>
  13
  14 #include <errno.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17 #include <unistd.h>
  18
  19 #include "vi.h"
  20 #include "excmd.h"
  21 #include "sex/sex_screen.h"
  22
  23 /*
  24  * ex_bang -- :[line [,line]] ! command
  25  *
  26  * Pass the rest of the line after the ! character to the program named by
  27  * the O_SHELL option.
  28  *
  29  * Historical vi did NOT do shell expansion on the arguments before passing
  30  * them, only file name expansion.  This means that the O_SHELL program got
  31  * "$t" as an argument if that is what the user entered.  Also, there's a
  32  * special expansion done for the bang command.  Any exclamation points in
  33  * the user's argument are replaced by the last, expanded ! command.
  34  *
  35  * There's some fairly amazing slop in this routine to make the different
  36  * ways of getting here display the right things.  It took a long time to
  37  * get it right (wrong?), so be careful.
  38  */
  39 int
  40 ex_bang(sp, ep, cmdp)
  41         SCR *sp;
  42         EXF *ep;
  43         EXCMDARG *cmdp;
  44 {
  45         enum filtertype ftype;
  46         ARGS *ap;
  47         EX_PRIVATE *exp;
  48         MARK rm;
  49         recno_t lno;
  50         size_t blen;
  51         int rval;
  52         char *bp, *msg;
  53
  54
  55         ap = cmdp->argv[0];
  56         if (ap->len == 0) {
  57                 msgq(sp, M_ERR, "Usage: %s", cmdp->cmd->usage);
  58                 return (1);
  59         }
  60
  61         /* Swap commands. */
  62         exp = EXP(sp);
  63         if (exp->lastbcomm != NULL)
  64                 FREE(exp->lastbcomm, strlen(exp->lastbcomm) + 1);
  65         if ((exp->lastbcomm = strdup(ap->bp)) == NULL) {
  66                 msgq(sp, M_SYSERR, NULL);
  67                 return (1);
  68         }
  69
  70         /*
  71          * If the command was modified by the expansion, we redisplay it.
  72          * Redisplaying it in vi mode is tricky, and handled separately
  73          * in each case below.  If we're in ex mode, it's easy, so we just
  74          * do it here.
  75          */
  76         bp = NULL;
  77         if (F_ISSET(cmdp, E_MODIFY)) {
  78                 if (IN_EX_MODE(sp)) {
  79                         (void)ex_printf(EXCOOKIE, "!%s\n", ap->bp);
  80                         (void)ex_fflush(EXCOOKIE);
  81                 }
  82                 /*
  83                  * Vi: Display the command if modified.  Historic vi displayed
  84                  * the command if it was modified due to file name and/or bang
  85                  * expansion.  If piping lines, it was immediately overwritten
  86                  * by any error or line change reporting.  We don't the user to
  87                  * have to page through the responses, so we only post it until
  88                  * it's erased by something else.  Otherwise, pass it on to the
  89                  * ex_exec_proc routine to display after the screen has been
  90                  * cleaned up.
  91                  */
  92                 if (IN_VI_MODE(sp)) {
  93                         GET_SPACE_RET(sp, bp, blen, ap->len + 2);
  94                         bp[0] = '!';
  95                         memmove(bp + 1, ap->bp, ap->len + 1);
  96                 }
  97         }
  98
  99         /*
 100          * If addresses were specified, pipe lines from the file through
 101          * the command.
 102          */
 103         if (cmdp->addrcnt != 0) {
 104                 if (bp != NULL) {
 105                         (void)sp->s_busy(sp, bp);
 106                         FREE_SPACE(sp, bp, blen);
 107                 }
 108                 /*
 109                  * !!!
 110                  * Historical vi permitted "!!" in an empty file.  When it
 111                  * happens, we get called with two addresses of 1,1 and a
 112                  * bad attitude.
 113                  */
 114                 ftype = FILTER;
 115                 if (cmdp->addr1.lno == 1 && cmdp->addr2.lno == 1) {
 116                         if (file_lline(sp, ep, &lno))
 117                                 return (1);
 118                         if (lno == 0) {
 119                                 cmdp->addr1.lno = cmdp->addr2.lno = 0;
 120                                 ftype = FILTER_READ;
 121                         }
 122                 }
 123                 if (filtercmd(sp, ep,
 124                     &cmdp->addr1, &cmdp->addr2, &rm, ap->bp, ftype))
 125                         return (1);
 126                 sp->lno = rm.lno;
 127                 F_SET(exp, EX_AUTOPRINT);
 128                 return (0);
 129         }
 130
 131         /*
 132          * If no addresses were specified, run the command.  If the file
 133          * has been modified and autowrite is set, write the file back.
 134          * If the file has been modified, autowrite is not set and the
 135          * warn option is set, tell the user about the file.
 136          */
 137         msg = "\n";
 138         if (F_ISSET(ep, F_MODIFIED))
 139                 if (O_ISSET(sp, O_AUTOWRITE)) {
 140                         if (file_write(sp, ep, NULL, NULL, NULL, FS_ALL)) {
 141                                 rval = 1;
 142                                 goto ret;
 143                         }
 144                 } else if (O_ISSET(sp, O_WARN))
 145                         if (IN_VI_MODE(sp) && F_ISSET(cmdp, E_MODIFY))
 146                                 msg = "\nFile modified since last write.\n";
 147                         else
 148                                 msg = "File modified since last write.\n";
 149
 150         /* Run the command. */
 151         rval = ex_exec_proc(sp, ap->bp, bp, msg);
 152
 153         /* Ex terminates with a bang. */
 154         if (IN_EX_MODE(sp))
 155                 (void)write(STDOUT_FILENO, "!\n", 2);
 156
 157         /* Vi requires user permission to continue. */
 158         if (IN_VI_MODE(sp))
 159                 F_SET(sp, S_CONTINUE);
 160
 161         /* Free the extra space. */
 162 ret:    if (bp != NULL)
 163                 FREE_SPACE(sp, bp, blen);
 164
 165         return (rval);
 166 }