ex/ex_edit.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_edit.c,v 8.14 1994/01/22 20:41:39 bostic Exp $ (Berkeley) $Date: 1994/01/22 20:41:39 $";
  10 #endif /* not lint */
  11
  12 #include <sys/types.h>
  13
  14 #include <errno.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17
  18 #include "vi.h"
  19 #include "excmd.h"
  20
  21 /*
  22  * ex_edit --   :e[dit][!] [+cmd] [file]
  23  *              :vi[sual][!] [+cmd] [file]
  24  *
  25  * Edit a file; if none specified, re-edit the current file.  The second
  26  * form of the command can only be executed while in vi mode.  See the
  27  * hack in ex.c:ex_cmd().
  28  *
  29  * !!!
  30  * Historic vi didn't permit the '+' command form without specifying
  31  * a file name as well.
  32  */
  33 int
  34 ex_edit(sp, ep, cmdp)
  35         SCR *sp;
  36         EXF *ep;
  37         EXCMDARG *cmdp;
  38 {
  39         ARGS *ap;
  40         FREF *frp;
  41
  42         frp = sp->frp;
  43         switch (cmdp->argc) {
  44         case 0:
  45                 /*
  46                  * If the name has been changed, we edit that file, not the
  47                  * original name.  If the user was editing a temporary file,
  48                  * create another one.  The reason for this is that we do
  49                  * special exit processing of temporary files, and reusing
  50                  * them is tricky.
  51                  */
  52                 if (frp->cname != NULL) {
  53                         if ((frp = file_add(sp, frp, frp->cname, 1)) == NULL)
  54                                 return (1);
  55                         set_alt_name(sp, sp->frp->cname);
  56                 } else if (frp->name == NULL)
  57                         if ((frp = file_add(sp, frp, NULL, 1)) == NULL)
  58                                 return (1);
  59                 break;
  60         case 1:
  61                 ap = cmdp->argv[0];
  62                 if ((frp = file_add(sp, sp->frp, ap->bp, 1)) == NULL)
  63                         return (1);
  64                 set_alt_name(sp, ap->bp);
  65                 break;
  66         default:
  67                 abort();
  68         }
  69
  70         /*
  71          * Check for modifications.
  72          *
  73          * !!!
  74          * Contrary to POSIX 1003.2-1992, autowrite did not affect :edit.
  75          */
  76         if (F_ISSET(ep, F_MODIFIED) &&
  77             ep->refcnt <= 1 && !F_ISSET(cmdp, E_FORCE)) {
  78                 msgq(sp, M_ERR,
  79                     "Modified since last write; write or use ! to override.");
  80                 return (1);
  81         }
  82
  83         /* Switch files. */
  84         if (file_init(sp, frp, NULL, F_ISSET(cmdp, E_FORCE)))
  85                 return (1);
  86         F_SET(sp, S_FSWITCH);
  87         return (0);
  88 }