1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/* @(#)filereopen.c 1.15 04/08/08 Copyright 1986, 1995 J. Schilling */
/*
* open new file on old stream
*
* Copyright (c) 1986, 1995 J. Schilling
*/
/*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* See the file CDDL.Schily.txt in this distribution for details.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file CDDL.Schily.txt from this distribution.
*/
#include "schilyio.h"
/*
* Note that because of a definition in schilyio.h we are using fseeko()/ftello()
* instead of fseek()/ftell() if available.
*/
LOCAL char *fmtab[] = {
"", /* 0 FI_NONE */
"r", /* 1 FI_READ */
"r+", /* 2 FI_WRITE **1) */
"r+", /* 3 FI_READ | FI_WRITE */
"b", /* 4 FI_NONE | FI_BINARY */
"rb", /* 5 FI_READ | FI_BINARY */
"r+b", /* 6 FI_WRITE | FI_BINARY **1) */
"r+b", /* 7 FI_READ | FI_WRITE | FI_BINARY */
/* + FI_APPEND */ "", /* 0 FI_NONE */
/* ... */ "r", /* 1 FI_READ */
"a", /* 2 FI_WRITE **1) */
"a+", /* 3 FI_READ | FI_WRITE */
"b", /* 4 FI_NONE | FI_BINARY */
"rb", /* 5 FI_READ | FI_BINARY */
"ab", /* 6 FI_WRITE | FI_BINARY **1) */
"a+b", /* 7 FI_READ | FI_WRITE | FI_BINARY */
};
/*
* NOTES:
* 1) there is no fopen() mode that opens for writing
* without creating/truncating at the same time.
*
* "w" will create/trunc files with fopen()
* "a" will create files with fopen()
*/
EXPORT FILE *
filereopen(name, mode, fp)
const char *name;
const char *mode;
FILE *fp;
{
int ret;
int omode = 0;
int flag = 0;
if (!_cvmod(mode, &omode, &flag))
return ((FILE *) NULL);
/*
* create/truncate file if necessary
*/
if ((ret = _openfd(name, omode)) < 0)
return ((FILE *) NULL);
close(ret);
fp = freopen(name,
fmtab[flag & (FI_READ | FI_WRITE | FI_BINARY | FI_APPEND)], fp);
if (fp != (FILE *) NULL) {
set_my_flag(fp, 0); /* must clear it if fp is reused */
if (flag & FI_APPEND) {
(void) fseek(fp, (off_t)0, SEEK_END);
}
if (flag & FI_UNBUF) {
setbuf(fp, NULL);
add_my_flag(fp, _IOUNBUF);
}
}
return (fp);
}
|
