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1//
2// putw.cpp
3//
4// Copyright (c) Microsoft Corporation. All rights reserved.
5//
6// Defines _putw(), which writes a binary integer to a stream.
7//
8#include <corecrt_internal_stdio.h>
9
10
11
12// Writes the binary int value to the stream, byte-by-byte. On success, returns
13// the value written; on failure, returns EOF. Note, however, that the value may
14// be EOF--that is, after all, a valid integer--so be sure to test ferror() and
15// feof() to check for error conditions.
16extern "C" int __cdecl _putw(int const value, FILE* const stream)
17{
18 _VALIDATE_RETURN(stream != nullptr, EINVAL, EOF);
19
20 int return_value = EOF;
21
22 _lock_file(stream);
23 __try
24 {
25 char const* const first = reinterpret_cast<char const*>(&value);
26 char const* const last = first + sizeof(value);
27 for (char const* it = first; it != last; ++it)
28 {
29 _fputc_nolock(*it, stream);
30 }
31
32 if (ferror(stream))
33 __leave;
34
35 return_value = value;
36 }
37 __finally
38 {
39 _unlock_file(stream);
40 }
41 __endtry
42
43 return return_value;
44}