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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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src
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tolower.c
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1998-06-17
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/***
*tolower.c - convert character to lower case
*
* Copyright (c) 1985-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Defines function versions of _tolower() and tolower().
*
*******************************************************************************/
#include <cruntime.h>
#include <ctype.h>
#include <stddef.h>
#ifndef _MAC
#include <locale.h>
#include <setlocal.h>
#include <mtdll.h>
#include <awint.h>
#endif /* _MAC */
/* remove macro defintions of _tolower() and tolower()
*/
#undef _tolower
#undef tolower
/* define function-like macro equivalent to _tolower()
*/
#define mklower(c) ( (c)-'A'+'a' )
/***
*int _tolower(c) - convert character to lower case
*
*Purpose:
* _tolower() is simply a function version of the macro of the same name.
*
*Entry:
* c - int value of character to be converted
*
*Exit:
* returns int value of lower case representation of c
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _tolower (
int c
)
{
return(mklower(c));
}
/***
*int tolower(c) - convert character to lower case
*
*Purpose:
* tolower() is simply a function version of the macro of the same name.
*
*Entry:
* c - int value of character to be converted
*
*Exit:
* if c is an upper case letter, returns int value of lower case
* representation of c. otherwise, it returns c.
*
*Exceptions:
*
*******************************************************************************/
int __cdecl tolower (
int c
)
{
#if !defined (_MAC)
#ifdef _MT
int local_lock_flag;
if (__lc_handle[LC_CTYPE] == _CLOCALEHANDLE)
{
if ( (c >= 'A') && (c <= 'Z') )
c = c + ('a' - 'A');
return c;
}
_lock_locale( local_lock_flag )
c = _tolower_lk(c);
_unlock_locale( local_lock_flag )
return c;
}
/***
*int _tolower_lk(c) - convert character to lower case
*
*Purpose:
* Multi-thread function only! Non-locking version of tolower.
*
*Entry:
*
*Exit:
*
*Exceptions:
*
*******************************************************************************/
int __cdecl _tolower_lk (
int c
)
{
#endif /* _MT */
int size;
unsigned char inbuffer[3];
unsigned char outbuffer[3];
if (__lc_handle[LC_CTYPE] == _CLOCALEHANDLE)
{
if ( (c >= 'A') && (c <= 'Z') )
c = c + ('a' - 'A');
return c;
}
/* if checking case of c does not require API call, do it */
if (c < 256)
{
if (!isupper(c))
{
return c;
}
}
/* convert int c to multibyte string */
if (isleadbyte(c >> 8 & 0xff))
{
inbuffer[0] = (c >> 8 & 0xff); /* put lead-byte at start of str */
inbuffer[1] = (unsigned char)c;
inbuffer[2] = 0;
size = 2;
} else {
inbuffer[0] = (unsigned char)c;
inbuffer[1] = 0;
size = 1;
}
/* convert to lowercase */
if ( 0 == (size = __crtLCMapStringA( __lc_handle[LC_CTYPE],
LCMAP_LOWERCASE,
inbuffer,
size,
outbuffer,
3,
0,
TRUE)) )
{
return c;
}
/* construct integer return value */
if (size == 1)
return ((int)outbuffer[0]);
else
return ((int)outbuffer[0] | ((int)outbuffer[1] << 8));
#else /* !defined (_MAC) */
return(isupper(c) ? mklower(c) : c);
#endif /* !defined (_MAC) */
}