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44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
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//
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// _getbuf.cpp
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// Defines __acrt_stdio_allocate_buffer_nolock(), which allocates a buffer for a stream.
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//
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#include <corecrt_internal_stdio.h>
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// Allocates a buffer for the provided stream. This function assumes that the
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// caller has already checked to ensure that the stream does not already have a
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// buffer.
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extern "C" void __cdecl __acrt_stdio_allocate_buffer_nolock(FILE* const public_stream)
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{
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_ASSERTE(public_stream != nullptr);
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__crt_stdio_stream const stream(public_stream);
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#ifndef CRTDLL
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++_cflush; // Force the library pre-termination procedure to run
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#endif
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// Try to get a big buffer:
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stream->_base = _calloc_crt_t(char, _INTERNAL_BUFSIZ).detach();
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if (stream->_base != nullptr)
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{
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stream.set_flags(_IOBUFFER_CRT);
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stream->_bufsiz = _INTERNAL_BUFSIZ;
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}
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// If we couldn't get a big buffer, use single character buffering:
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else
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{
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stream.set_flags(_IOBUFFER_NONE);
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stream->_base = reinterpret_cast<char *>(&stream->_charbuf);
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stream->_bufsiz = 2;
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}
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stream->_ptr = stream->_base;
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stream->_cnt = 0;
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}
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