home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Tricks of the Windows Gam…ming Gurus (2nd Edition)
/
Disc2.iso
/
vc98
/
crt
/
src
/
putch.c
< prev
next >
Wrap
C/C++ Source or Header
|
1998-06-17
|
3KB
|
103 lines
/***
*putch.c - contains the _putch() routine
*
* Copyright (c) 1989-1997, Microsoft Corporation. All rights reserved
*
*Purpose:
* The routine "_putch()" writes a single character to the console.
*
* NOTE: In real-mode MS-DOS the character is actually written to standard
* output, and is therefore redirected when standard output is redirected.
* However, under Win32 console mode, the character is ALWAYS written
* to the console, even when standard output has been redirected.
*
*******************************************************************************/
#include <cruntime.h>
#include <oscalls.h>
#include <conio.h>
#include <internal.h>
#include <mtdll.h>
#include <stdio.h>
/*
* declaration for console handle
*/
extern int _confh;
/***
*int _putch(c) - write a character to the console
*
*Purpose:
* Calls WriteConsole to output the character
* Note: in Win32 console mode always writes to console even
* when stdout redirected
*
*Entry:
* c - Character to be output
*
*Exit:
* If an error is returned from WriteConsole
* Then returns EOF
* Otherwise
* returns character that was output
*
*Exceptions:
*
*******************************************************************************/
#ifdef _MT
/* normal version lock and unlock the console, and then call the _lk version
which directly accesses the console without locking. */
int __cdecl _putch (
int c
)
{
int ch;
_mlock(_CONIO_LOCK); /* secure the console lock */
ch = _putch_lk(c); /* output the character */
_munlock(_CONIO_LOCK); /* release the console lock */
return ch;
}
#endif /* _MT */
/* define version which accesses the console directly - normal version in
non-_MT situations, special _lk version in _MT */
#ifdef _MT
int __cdecl _putch_lk (
#else /* _MT */
int __cdecl _putch (
#endif /* _MT */
int c
)
{
/* can't use ch directly unless sure we have a big-endian machine */
unsigned char ch = (unsigned char)c;
ULONG num_written;
/*
* _confh, the handle to the console output, is created the
* first time that either _putch() or _cputs() is called.
*/
if (_confh == -2)
__initconout();
/* write character to console file handle */
if ( (_confh == -1) || !WriteConsole( (HANDLE)_confh,
(LPVOID)&ch,
1,
&num_written,
NULL )
)
/* return error indicator */
return EOF;
return ch;
}