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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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inithelp.c
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C/C++ Source or Header
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1998-06-17
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5KB
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139 lines
/***
*inithelp.c - Contains the __getlocaleinfo helper routine
*
* Copyright (c) 1992-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* Contains the __getlocaleinfo helper routine.
*
*******************************************************************************/
#include <stdlib.h>
#include <cruntime.h>
#include <locale.h>
#include <setlocal.h>
#include <awint.h>
#include <dbgint.h>
/***
*__getlocaleinfo - return locale data
*
*Purpose:
* Return locale data appropriate for the setlocale init functions.
* In particular, wide locale strings are converted to char strings
* or numeric depending on the value of the first parameter.
*
* Memory is allocated for the char version of the data, and the
* calling function's pointer is set to it. This pointer should later
* be used to free the data. The wide-char data is fetched using
* GetLocaleInfo and converted to multibyte using WideCharToMultiByte.
*
* *** For internal use by the __init_* functions only ***
*
* *** Future optimization ***
* When converting a large number of wide-strings to multibyte, do
* not query the size of the result, but convert them one after
* another into a large character buffer. The entire buffer can
* also be freed with one pointer.
*
*Entry:
* int lc_type - LC_STR_TYPE for string data, LC_INT_TYPE for numeric data
* LCID localehandle - LCID based on category and lang or ctry of __lc_id
* LCTYPE fieldtype - int or string value
* void *address - cast to either char * or char**
*
*Exit:
* 0 success
* -1 failure
*
*Exceptions:
*
*******************************************************************************/
#if NO_ERROR == -1
#error Need to use another error return code in __getlocaleinfo
#endif /* NO_ERROR == -1 */
#define STR_CHAR_CNT 128
#define INT_CHAR_CNT 4
int __cdecl __getlocaleinfo (
int lc_type,
LCID localehandle,
LCTYPE fieldtype,
void *address
)
{
if (lc_type == LC_STR_TYPE)
{
char **straddress = (char **)address;
unsigned char cbuffer[STR_CHAR_CNT];
unsigned char *pcbuffer = cbuffer;
int bufferused = 0; /* 1 indicates buffer points to malloc'ed memory */
int buffersize = STR_CHAR_CNT;
int outsize;
if ((outsize = __crtGetLocaleInfoA(localehandle, fieldtype, pcbuffer, buffersize, 0))
== 0)
{
if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
goto error;
/* buffersize too small, get required size and malloc new buffer */
if ((buffersize = __crtGetLocaleInfoA (localehandle, fieldtype, NULL, 0, 0))
== 0)
goto error;
if ((pcbuffer = (unsigned char *) _malloc_crt (buffersize * sizeof(unsigned char)))
== NULL)
goto error;
bufferused = 1;
if ((outsize = __crtGetLocaleInfoA (localehandle, fieldtype, pcbuffer, buffersize, 0))
== 0)
goto error;
}
if ((*straddress = (char *) _malloc_crt (outsize * sizeof(char))) == NULL)
goto error;
strncpy(*straddress, pcbuffer, outsize);
if (bufferused)
_free_crt (pcbuffer);
return 0;
error:
if (bufferused)
_free_crt (pcbuffer);
return -1;
} else if (lc_type == LC_INT_TYPE)
{
int i;
char c;
static wchar_t wcbuffer[INT_CHAR_CNT];
const int buffersize = INT_CHAR_CNT;
char *charaddress = (char *)address;
if (__crtGetLocaleInfoW (localehandle, fieldtype, (LPWSTR)&wcbuffer, buffersize, 0) == 0)
return -1;
*(char *)charaddress = 0;
/* assume GetLocaleInfoW returns valid ASCII integer in wcstr format */
for (i = 0; i < INT_CHAR_CNT; i++)
{
if (isdigit(((unsigned char)c = (unsigned char)wcbuffer[i])))
*(unsigned char *)charaddress = (unsigned char)(10 * (int)(*charaddress) + (c - '0'));
else
break;
}
return 0;
}
return -1;
}