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

   1 /*      $NetBSD: ex_edit.c,v 1.7 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_edit.c,v 10.14 2001/08/28 13:29:15 skimo Exp  (Berkeley) Date: 2001/08/28 13:29:15 ";
  17 #endif /* not lint */
  18 #else
  19 __RCSID("$NetBSD: ex_edit.c,v 1.7 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
  33 #include "../common/common.h"
  34 #include "../vi/vi.h"
  35
  36 static int ex_N_edit __P((SCR *, EXCMD *, FREF *, int));
  37
  38 /*
  39  * ex_edit --   :e[dit][!] [+cmd] [file]
  40  *              :ex[!] [+cmd] [file]
  41  *              :vi[sual][!] [+cmd] [file]
  42  *
  43  * Edit a file; if none specified, re-edit the current file.  The third
  44  * form of the command can only be executed while in vi mode.  See the
  45  * hack in ex.c:ex_cmd().
  46  *
  47  * !!!
  48  * Historic vi didn't permit the '+' command form without specifying
  49  * a file name as well.  This seems unreasonable, so we support it
  50  * regardless.
  51  *
  52  * PUBLIC: int ex_edit __P((SCR *, EXCMD *));
  53  */
  54 int
  55 ex_edit(SCR *sp, EXCMD *cmdp)
  56 {
  57         FREF *frp;
  58         int attach, setalt;
  59         const char *np;
  60         size_t nlen;
  61
  62         switch (cmdp->argc) {
  63         case 0:
  64                 /*
  65                  * If the name has been changed, we edit that file, not the
  66                  * original name.  If the user was editing a temporary file
  67                  * (or wasn't editing any file), create another one.  The
  68                  * reason for not reusing temporary files is that there is
  69                  * special exit processing of them, and reuse is tricky.
  70                  */
  71                 frp = sp->frp;
  72                 if (sp->ep == NULL || F_ISSET(frp, FR_TMPFILE)) {
  73                         if ((frp = file_add(sp, NULL)) == NULL)
  74                                 return (1);
  75                         attach = 0;
  76                 } else
  77                         attach = 1;
  78                 setalt = 0;
  79                 break;
  80         case 1:
  81                 INT2CHAR(sp, cmdp->argv[0]->bp, cmdp->argv[0]->len + 1,
  82                          np, nlen);
  83                 if ((frp = file_add(sp, np)) == NULL)
  84                         return (1);
  85                 attach = 0;
  86                 setalt = 1;
  87                 set_alt_name(sp, np);
  88                 break;
  89         default:
  90                 abort();
  91         }
  92
  93         if (F_ISSET(cmdp, E_NEWSCREEN) || cmdp->cmd == &cmds[C_VSPLIT])
  94                 return (ex_N_edit(sp, cmdp, frp, attach));
  95
  96         /*
  97          * Check for modifications.
  98          *
  99          * !!!
 100          * Contrary to POSIX 1003.2-1992, autowrite did not affect :edit.
 101          */
 102         if (file_m2(sp, FL_ISSET(cmdp->iflags, E_C_FORCE)))
 103                 return (1);
 104
 105         /* Switch files. */
 106         if (file_init(sp, frp, NULL, (setalt ? FS_SETALT : 0) |
 107             (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0)))
 108                 return (1);
 109
 110         F_SET(sp, SC_FSWITCH);
 111         return (0);
 112 }
 113
 114 /*
 115  * ex_N_edit --
 116  *      New screen version of ex_edit.
 117  */
 118 static int
 119 ex_N_edit(SCR *sp, EXCMD *cmdp, FREF *frp, 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_fini(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                 TAILQ_INSERT_HEAD(&new->ep->scrq, new, eq);
 138
 139                 new->frp = frp;
 140                 new->frp->flags = sp->frp->flags;
 141
 142                 new->lno = sp->lno;
 143                 new->cno = sp->cno;
 144         } else if (file_init(new, frp, NULL,
 145             (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0))) {
 146                 (void)vs_discard(new, NULL);
 147                 (void)screen_end(new);
 148                 return (1);
 149         }
 150
 151         /* Create the argument list. */
 152         new->cargv = new->argv = ex_buildargv(sp, NULL, frp->name);
 153
 154         /* Set up the switch. */
 155         sp->nextdisp = new;
 156         F_SET(sp, SC_SSWITCH);
 157
 158         return (0);
 159 }