1 /* $Id: $ */
2
3 /* Copyright (C) 1997 Sverre Hvammen Johansen,
4 * Department of Informatics, University of Oslo.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20 #include "file.h"
21 #include "simfile.h"
22
23
24 /******************************************************************************
25 BOOLEAN PROCEDURE OPEN */
26
27 char
__rdopen(p,t)28 __rdopen (p, t)
29 __bs5FILE *p;
30 __txtvp t;
31 {
32 long loc;
33 if (!((__bs1FILE *) p)->open)
34 {
35 ((__bs1FILE *) p)->file
36 = fopen (((__bs1FILE *) p)->filename.obj->string, "r");
37 if (((__bs1FILE *) p)->file != __NULL)
38 (void) fclose (((__bs1FILE *) p)->file);
39 if (((__bs1FILE *) p)->create == __CREATE
40 && ((__bs1FILE *) p)->file != __NULL)
41 return (__FALSE);
42 if (((__bs1FILE *) p)->create == __NOCREATE
43 && ((__bs1FILE *) p)->file == __NULL)
44 return (__FALSE);
45 #if VMS_DIRECTFILE
46 if (((__bs1FILE *) p)->file == __NULL)
47 {
48 if ((((__bs1FILE *) p)->file
49 = fopen (((__bs1FILE *) p)->filename.obj->string
50 ,"w")) == __NULL)
51 return (__FALSE);
52 (void) fclose (((__bs1FILE *) p)->file);
53 }
54 if ((((__bs1FILE *) p)->file
55 = fopen (((__bs1FILE *) p)->filename.obj->string
56 ,"r+")) == __NULL)
57 return (__FALSE);
58 #else
59 if ((((__bs1FILE *) p)->file
60 = fopen (((__bs1FILE *) p)->filename.obj->string
61 ,((__bs1FILE *) p)->file == __NULL ? "w+" :
62 ((__bs1FILE *) p)->readwrite == __READONLY ? "r" : "r+")) == __NULL)
63 return (__FALSE);
64 #endif
65 if (((__bs1FILE *) p)->append == __APPEND)
66 {
67 if (fseek (((__bs1FILE *) p)->file, 0L, 2) == __EOF)
68 {
69 (void) fclose (((__bs1FILE *) p)->file);
70 return (__FALSE);
71 }
72 loc = ftell (((__bs1FILE *) p)->file);
73 }
74 else
75 loc = 0;
76 p->loc = loc / (t->length + 1) + 1;
77 if (loc % (t->length + 1))
78 __rerror ("Open: Illegal size on direct-file");
79 p->minwriteloc = p->loc;
80 p->lastop = __SEEK;
81 p->maxloc = (MAX_INT - 1) / (t->length + 1);
82 if (((__bs1FILE *) p)->readwrite == __READONLY)
83 p->minwriteloc = MAX_INT;
84 if (((__bs1FILE *) p)->readwrite == __WRITEONLY)
85 p->writeonly = __TRUE;
86 ((__bs2FILE *) p)->IMAGE.obj = t->obj;
87 ((__bs2FILE *) p)->IMAGE.length = t->length;
88 ((__bs2FILE *) p)->IMAGE.pos = 1;
89 ((__bs2FILE *) p)->IMAGE.start = t->start;
90 ((__bs5FILE *) p)->endfile = __FALSE;
91 ((__bs5FILE *) p)->imagelength = t->length;
92 return (((__bs1FILE *) p)->open = __TRUE);
93 }
94 else
95 return (__FALSE);
96 }
97