source: trunk/minix/lib/ack/libp/opn.c@ 20

Last change on this file since 20 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a

File size: 2.4 KB
Line 
1/* $Header: /cvsup/minix/src/lib/ack/libp/opn.c,v 1.1 2005/10/10 15:27:47 beng Exp $ */
2/*
3 * (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
4 *
5 * This product is part of the Amsterdam Compiler Kit.
6 *
7 * Permission to use, sell, duplicate or disclose this software must be
8 * obtained in writing. Requests for such permissions may be sent to
9 *
10 * Dr. Andrew S. Tanenbaum
11 * Wiskundig Seminarium
12 * Vrije Universiteit
13 * Postbox 7161
14 * 1007 MC Amsterdam
15 * The Netherlands
16 *
17 */
18
19/* Author: J.W. Stevenson */
20
21#include <pc_file.h>
22#include <pc_err.h>
23
24extern struct file **_extfl;
25extern int _extflc;
26extern struct file *_curfil;
27extern int _pargc;
28extern char **_pargv;
29extern char ***_penviron;
30
31extern _cls();
32extern _xcls();
33extern _trp();
34extern int _getpid();
35extern int _creat();
36extern int _open();
37extern int _close();
38extern int _unlink();
39extern long _lseek();
40
41static int tmpfil() {
42 static char namebuf[] = "/usr/tmp/plf.xxxxx";
43 int i; char *p,*q;
44
45 i = _getpid();
46 p = namebuf;
47 q = p + 13;
48 do
49 *q++ = (i & 07) + '0';
50 while (i >>= 3);
51 *q = '\0';
52 if ((i = _creat(p,0644)) < 0)
53 if ((i = _creat(p += 4,0644)) < 0)
54 if ((i = _creat(p += 5,0644)) < 0)
55 goto error;
56 if (_close(i) != 0)
57 goto error;
58 if ((i = _open(p,2)) < 0)
59 goto error;
60 if (_unlink(p) != 0)
61error: _trp(EREWR);
62 return(i);
63}
64
65static int initfl(descr,sz,f) int descr; int sz; struct file *f; {
66 int i;
67
68 _curfil = f;
69 if (sz == 0) {
70 sz++;
71 descr |= TXTBIT;
72 }
73 for (i=0; i<_extflc; i++)
74 if (f == _extfl[i])
75 break;
76 if (i >= _extflc) { /* local file */
77 f->fname = "LOCAL";
78 if ((descr & WRBIT) == 0 && (f->flags & 0377) == MAGIC) {
79 _xcls(f);
80 if (_lseek(f->ufd,(long)0,0) == -1)
81 _trp(ERESET);
82 } else {
83 _cls(f);
84 f->ufd = tmpfil();
85 }
86 } else { /* external file */
87 if (--i <= 0)
88 return(0);
89 if (i >= _pargc)
90 _trp(EARGC);
91 f->fname = _pargv[i];
92 _cls(f);
93 if ((descr & WRBIT) == 0) {
94 if ((f->ufd = _open(f->fname,0)) < 0)
95 _trp(ERESET);
96 } else {
97 if ((f->ufd = _creat(f->fname,0644)) < 0)
98 _trp(EREWR);
99 }
100 }
101 f->buflen = (sz>PC_BUFLEN ? sz : PC_BUFLEN-PC_BUFLEN%sz);
102 f->size = sz;
103 f->ptr = f->bufadr;
104 f->flags = descr;
105 return(1);
106}
107
108_opn(sz,f) int sz; struct file *f; {
109
110 if (initfl(MAGIC,sz,f))
111 f->count = 0;
112}
113
114_cre(sz,f) int sz; struct file *f; {
115
116 if (initfl(WRBIT|EOFBIT|ELNBIT|MAGIC,sz,f))
117 f->count = f->buflen;
118}
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