contrib/nvi/ex/ex_edit.c

   1 /*-
   2  * Copyright (c) 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   5  *      Keith Bostic.  All rights reserved.
   6  *
   7  * See the LICENSE file for redistribution information.
   8  */
   9
  10 #include "config.h"
  11
  12 #ifndef lint
  13 static const char sccsid[] = "@(#)ex_edit.c     10.10 (Berkeley) 4/27/96";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18 #include <sys/time.h>
  19
  20 #include <bitstring.h>
  21 #include <errno.h>
  22 #include <limits.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "../common/common.h"
  28 #include "../vi/vi.h"
  29
  30 static int ex_N_edit __P((SCR *, EXCMD *, FREF *, int));
  31
  32 /*
  33  * ex_edit --   :e[dit][!] [+cmd] [file]
  34  *              :ex[!] [+cmd] [file]
  35  *              :vi[sual][!] [+cmd] [file]
  36  *
  37  * Edit a file; if none specified, re-edit the current file.  The third
  38  * form of the command can only be executed while in vi mode.  See the
  39  * hack in ex.c:ex_cmd().
  40  *
  41  * !!!
  42  * Historic vi didn't permit the '+' command form without specifying
  43  * a file name as well.  This seems unreasonable, so we support it
  44  * regardless.
  45  *
  46  * PUBLIC: int ex_edit __P((SCR *, EXCMD *));
  47  */
  48 int
  49 ex_edit(sp, cmdp)
  50         SCR *sp;
  51         EXCMD *cmdp;
  52 {
  53         FREF *frp;
  54         int attach, setalt;
  55
  56         switch (cmdp->argc) {
  57         case 0:
  58                 /*
  59                  * If the name has been changed, we edit that file, not the
  60                  * original name.  If the user was editing a temporary file
  61                  * (or wasn't editing any file), create another one.  The
  62                  * reason for not reusing temporary files is that there is
  63                  * special exit processing of them, and reuse is tricky.
  64                  */
  65                 frp = sp->frp;
  66                 if (sp->ep == NULL || F_ISSET(frp, FR_TMPFILE)) {
  67                         if ((frp = file_add(sp, NULL)) == NULL)
  68                                 return (1);
  69                         attach = 0;
  70                 } else
  71                         attach = 1;
  72                 setalt = 0;
  73                 break;
  74         case 1:
  75                 if ((frp = file_add(sp, cmdp->argv[0]->bp)) == NULL)
  76                         return (1);
  77                 attach = 0;
  78                 setalt = 1;
  79                 set_alt_name(sp, cmdp->argv[0]->bp);
  80                 break;
  81         default:
  82                 abort();
  83         }
  84
  85         if (F_ISSET(cmdp, E_NEWSCREEN))
  86                 return (ex_N_edit(sp, cmdp, frp, attach));
  87
  88         /*
  89          * Check for modifications.
  90          *
  91          * !!!
  92          * Contrary to POSIX 1003.2-1992, autowrite did not affect :edit.
  93          */
  94         if (file_m2(sp, FL_ISSET(cmdp->iflags, E_C_FORCE)))
  95                 return (1);
  96
  97         /* Switch files. */
  98         if (file_init(sp, frp, NULL, (setalt ? FS_SETALT : 0) |
  99             (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0)))
 100                 return (1);
 101
 102         F_SET(sp, SC_FSWITCH);
 103         return (0);
 104 }
 105
 106 /*
 107  * ex_N_edit --
 108  *      New screen version of ex_edit.
 109  */
 110 static int
 111 ex_N_edit(sp, cmdp, frp, attach)
 112         SCR *sp;
 113         EXCMD *cmdp;
 114         FREF *frp;
 115         int attach;
 116 {
 117         SCR *new;
 118
 119         /* Get a new screen. */
 120         if (screen_init(sp->gp, sp, &new))
 121                 return (1);
 122         if (vs_split(sp, new, 0)) {
 123                 (void)screen_end(new);
 124                 return (1);
 125         }
 126
 127         /* Get a backing file. */
 128         if (attach) {
 129                 /* Copy file state, keep the screen and cursor the same. */
 130                 new->ep = sp->ep;
 131                 ++new->ep->refcnt;
 132
 133                 new->frp = frp;
 134                 new->frp->flags = sp->frp->flags;
 135
 136                 new->lno = sp->lno;
 137                 new->cno = sp->cno;
 138         } else if (file_init(new, frp, NULL,
 139             (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0))) {
 140                 (void)vs_discard(new, NULL);
 141                 (void)screen_end(new);
 142                 return (1);
 143         }
 144
 145         /* Create the argument list. */
 146         new->cargv = new->argv = ex_buildargv(sp, NULL, frp->name);
 147
 148         /* Set up the switch. */
 149         sp->nextdisp = new;
 150         F_SET(sp, SC_SSWITCH);
 151
 152         return (0);
 153 }