blob: 59ee055e267f480632b03fb44916e671839ed283 (
plain) (
blame)
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
90
91
92
93
94
95
96
97
98
99
100
101
102
|
/***
*_getbuf.c - Get a stream buffer
*
* Copyright (c) 1987-1993, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Allocate a buffer and init stream data bases.
*
*Revision History:
* 11-06-87 JCR Initial version (split off from _filbuf.c)
* 01-11-88 JCR Moved from mthread/dll only to main code
* 06-06-88 JCR Optimized _iob2 references
* 06-10-88 JCR Use near pointer to reference _iob[] entries
* 07-27-88 GJF Added _cflush++ to force pre-terminator (necessary in
* case stdout has been redirected to a file and acquires
* a buffer here, and pre-terminator has not already been
* forced).
* 08-25-88 GJF Don't use FP_OFF() macro for the 386
* 08-28-89 JCR Removed _NEAR_ for 386
* 02-15-90 GJF _iob[], _iob2[] merge. Also, fixed copyright and
* indents.
* 03-16-90 GJF Replaced near cdecl with _CALLTYPE1, added #include
* <cruntime.h> and removed #include <register.h>. Also,
* removed some leftover 16-bit support.
* 07-23-90 SBM Replaced <assertm.h> by <assert.h>
* 10-03-90 GJF New-style function declarator.
* 04-27-93 CFW Change _IONBF size to 2 bytes to hold wide char.
* 11-04-93 SRW Dont call malloc in _NTSUBSET_ version
*
*******************************************************************************/
#include <cruntime.h>
#include <stdio.h>
#include <file2.h>
#include <assert.h>
#include <malloc.h>
#include <internal.h>
/***
*_getbuf() - Allocate a buffer and init stream data bases
*
*Purpose:
* Allocates a buffer for a stream and inits the stream data bases.
*
* [NOTE 1: This routine assumes the caller has already checked to make
* sure the stream needs a buffer.
*
* [NOTE 2: Multi-thread - Assumes caller has aquired stream lock, if
* needed.]
*
*Entry:
* FILE *stream = stream to allocate a buffer for
*
*Exit:
* void
*
*Exceptions:
*
*******************************************************************************/
void _CALLTYPE1 _getbuf (
FILE *str
)
{
REG1 FILE *stream;
assert(str != NULL);
#if !defined _NTSUBSET_ || defined _POSIX_
/* force library pre-termination procedure */
_cflush++;
#endif // _NTSUBSET_ || _POSIX_
/* Init pointers */
stream = str;
#if !defined _NTSUBSET_ || defined _POSIX_
/* Try to get a big buffer */
if (stream->_base = malloc(BUFSIZ)) {
/* Got a big buffer */
stream->_flag |= _IOMYBUF;
stream->_bufsiz = BUFSIZ;
}
else {
#endif // _NTSUBSET_ || _POSIX_
/* Did NOT get a buffer - use single char buffering. */
stream->_flag |= _IONBF;
stream->_base = (char *)&(stream->_charbuf);
stream->_bufsiz = 2;
#if !defined _NTSUBSET_ || defined _POSIX_
}
#endif // _NTSUBSET_ || _POSIX_
stream->_ptr = stream->_base;
stream->_cnt = 0;
return;
}
|
