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1//
2// fgetc.cpp
3//
4// Copyright (c) Microsoft Corporation. All rights reserved.
5//
6// Functions that read the next character from a stream and return it. If the
7// read causes the stream to reach EOF, EOF is returned and the EOF bit is set
8// on the stream.
9//
10#include <corecrt_internal_stdio.h>
11
12
13
14extern "C" int __cdecl _fgetc_nolock(FILE* const public_stream)
15{
16 __crt_stdio_stream const stream(public_stream);
17
18 _VALIDATE_RETURN(stream.valid(), EINVAL, EOF);
19
20 --stream->_cnt;
21
22 if (stream->_cnt < 0)
23 return __acrt_stdio_refill_and_read_narrow_nolock(stream.public_stream());
24
25 char const c = *stream->_ptr;
26 ++stream->_ptr;
27 return c & 0xff;
28}
29
30
31
32extern "C" int __cdecl _getc_nolock(FILE* const stream)
33{
34 return _fgetc_nolock(stream);
35}
36
37
38
39extern "C" int __cdecl fgetc(FILE* const public_stream)
40{
41 __crt_stdio_stream const stream(public_stream);
42
43 _VALIDATE_RETURN(stream.valid(), EINVAL, EOF);
44
45 int return_value = 0;
46
47 _lock_file(stream.public_stream());
48 __try
49 {
50 _VALIDATE_STREAM_ANSI_RETURN(stream, EINVAL, EOF);
51
52 return_value = _fgetc_nolock(stream.public_stream());
53 }
54 __finally
55 {
56 _unlock_file(stream.public_stream());
57 }
58 __endtry
59
60 return return_value;
61}
62
63
64
65extern "C" int __cdecl getc(FILE* const stream)
66{
67 return fgetc(stream);
68}
69
70
71
72extern "C" int __cdecl _fgetchar()
73{
74 return fgetc(stdin);
75}
76
77
78
79extern "C" int __cdecl getchar()
80{
81 return _fgetchar();
82}