126 lines
4 KiB
C
126 lines
4 KiB
C
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/***
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*putch.c - contains the _putch() routine
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*
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* Copyright (c) 1989-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* The routine "_putch()" writes a single character to the console.
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*
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* NOTE: In real-mode MS-DOS the character is actually written to standard
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* output, and is therefore redirected when standard output is redirected.
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* However, under Win32 console mode, the character is ALWAYS written
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* to the console, even when standard output has been redirected.
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*
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*Revision History:
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* 06-08-89 PHG Module created, based on asm version
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* 03-13-90 GJF Made calling type _CALLTYPE1, added #include
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* <cruntime.h> and fixed copyright. Also, cleaned up
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* the formatting a bit.
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* 06-05-90 SBM Recoded as pure 32-bit, using new file handle state bits
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* 07-24-90 SBM Removed '32' from API names
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* 10-01-90 GJF New-style function declarators.
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* 12-04-90 SRW Changed to include <oscalls.h> instead of <doscalls.h>
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* 12-06-90 SRW Added _CRUISER_ and _WIN32 conditionals.
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* 01-16-91 GJF ANSI naming.
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* 02-19-91 SRW Adapt to OpenFile/CreateFile changes (_WIN32_)
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* 02-25-91 MHL Adapt to ReadFile/WriteFile changes (_WIN32_)
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* 07-26-91 GJF Took out init. stuff and cleaned up the error
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* handling [_WIN32_].
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* 03-20-93 GJF Use WriteConsole instead of WriteFile.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 09-06-94 CFW Remove Cruiser support.
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* 09-06-94 CFW Replace MTHREAD with _MT.
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* 12-03-94 SKS Clean up OS/2 references
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* 12-08-95 SKS _confh is now initialized on demand
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* 02-07-98 GJF Changes for Win64: type of _confh is now intptr_t.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <oscalls.h>
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#include <conio.h>
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#include <internal.h>
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#include <mtdll.h>
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#include <stdio.h>
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/*
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* declaration for console handle
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*/
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extern intptr_t _confh;
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/***
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*int _putch(c) - write a character to the console
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*
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*Purpose:
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* Calls WriteConsole to output the character
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* Note: in Win32 console mode always writes to console even
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* when stdout redirected
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*
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*Entry:
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* c - Character to be output
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*
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*Exit:
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* If an error is returned from WriteConsole
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* Then returns EOF
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* Otherwise
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* returns character that was output
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*
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*Exceptions:
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*
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*******************************************************************************/
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#ifdef _MT
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/* normal version lock and unlock the console, and then call the _lk version
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which directly accesses the console without locking. */
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int __cdecl _putch (
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int c
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)
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{
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int ch;
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_mlock(_CONIO_LOCK); /* secure the console lock */
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ch = _putch_lk(c); /* output the character */
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_munlock(_CONIO_LOCK); /* release the console lock */
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return ch;
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}
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#endif /* _MT */
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/* define version which accesses the console directly - normal version in
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non-_MT situations, special _lk version in _MT */
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#ifdef _MT
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int __cdecl _putch_lk (
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#else
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int __cdecl _putch (
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#endif
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int c
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)
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{
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/* can't use ch directly unless sure we have a big-endian machine */
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unsigned char ch = (unsigned char)c;
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ULONG num_written;
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/*
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* _confh, the handle to the console output, is created the
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* first time that either _putch() or _cputs() is called.
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*/
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if (_confh == -2)
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__initconout();
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/* write character to console file handle */
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if ( (_confh == -1) || !WriteConsole( (HANDLE)_confh,
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(LPVOID)&ch,
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1,
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&num_written,
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NULL )
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)
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/* return error indicator */
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return EOF;
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return ch;
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}
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