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[] = "$Id: ex_edit.c,v 10.12 2000/07/14 14:29:20 skimo Exp $ (Berkeley) $Date: 2000/07/14 14:29:20 $";
  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         char *np;
  56         size_t nlen;
  57
  58         switch (cmdp->argc) {
  59         case 0:
  60                 /*
  61                  * If the name has been changed, we edit that file, not the
  62                  * original name.  If the user was editing a temporary file
  63                  * (or wasn't editing any file), create another one.  The
  64                  * reason for not reusing temporary files is that there is
  65                  * special exit processing of them, and reuse is tricky.
  66                  */
  67                 frp = sp->frp;
  68                 if (sp->ep == NULL || F_ISSET(frp, FR_TMPFILE)) {
  69                         if ((frp = file_add(sp, NULL)) == NULL)
  70                                 return (1);
  71                         attach = 0;
  72                 } else
  73                         attach = 1;
  74                 setalt = 0;
  75                 break;
  76         case 1:
  77                 INT2CHAR(sp, cmdp->argv[0]->bp, cmdp->argv[0]->len + 1,
  78                          np, nlen);
  79                 if ((frp = file_add(sp, np)) == NULL)
  80                         return (1);
  81                 attach = 0;
  82                 setalt = 1;
  83                 set_alt_name(sp, np);
  84                 break;
  85         default:
  86                 abort();
  87         }
  88
  89         if (F_ISSET(cmdp, E_NEWSCREEN) || cmdp->cmd == &cmds[C_VSPLIT])
  90                 return (ex_N_edit(sp, cmdp, frp, attach));
  91
  92         /*
  93          * Check for modifications.
  94          *
  95          * !!!
  96          * Contrary to POSIX 1003.2-1992, autowrite did not affect :edit.
  97          */
  98         if (file_m2(sp, FL_ISSET(cmdp->iflags, E_C_FORCE)))
  99                 return (1);
 100
 101         /* Switch files. */
 102         if (file_init(sp, frp, NULL, (setalt ? FS_SETALT : 0) |
 103             (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0)))
 104                 return (1);
 105
 106         F_SET(sp, SC_FSWITCH);
 107         return (0);
 108 }
 109
 110 /*
 111  * ex_N_edit --
 112  *      New screen version of ex_edit.
 113  */
 114 static int
 115 ex_N_edit(sp, cmdp, frp, attach)
 116         SCR *sp;
 117         EXCMD *cmdp;
 118         FREF *frp;
 119         int attach;
 120 {
 121         SCR *new;
 122
 123         /* Get a new screen. */
 124         if (screen_init(sp->gp, sp, &new))
 125                 return (1);
 126         if (cmdp->cmd == &cmds[C_VSPLIT] && vs_vsplit(sp, new) ||
 127             cmdp->cmd != &cmds[C_VSPLIT] && vs_split(sp, new, 0)) {
 128                 (void)screen_end(new);
 129                 return (1);
 130         }
 131
 132         /* Get a backing file. */
 133         if (attach) {
 134                 /* Copy file state, keep the screen and cursor the same. */
 135                 new->ep = sp->ep;
 136                 ++new->ep->refcnt;
 137
 138                 new->frp = frp;
 139                 new->frp->flags = sp->frp->flags;
 140
 141                 new->lno = sp->lno;
 142                 new->cno = sp->cno;
 143         } else if (file_init(new, frp, NULL,
 144             (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0))) {
 145                 (void)vs_discard(new, NULL);
 146                 (void)screen_end(new);
 147                 return (1);
 148         }
 149
 150         /* Create the argument list. */
 151         new->cargv = new->argv = ex_buildargv(sp, NULL, frp->name);
 152
 153         /* Set up the switch. */
 154         sp->nextdisp = new;
 155         F_SET(sp, SC_SSWITCH);
 156
 157         return (0);
 158 }