190 lines
6.3 KiB
C
190 lines
6.3 KiB
C
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/***
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*convrtcp.c - support routines for Ansi WinAPIs.
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*
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* Copyright (c) 1993-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Implementation of routines to convert multibyte string from one code
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* page to another.
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*
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*Revision History:
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* 08-18-00 GB Module created.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <internal.h>
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#include <setlocal.h>
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#include <locale.h>
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#include <awint.h>
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#include <dbgint.h>
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#include <malloc.h>
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#include <stdlib.h>
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#include <wchar.h>
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/***
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*int __cdecl __ansicp - count characters in a string, up to n.
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*
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*Purpose:
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* return ansi codepage for given Locale
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*
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*Entry:
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* int lcid - Locale ID
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*
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*Exit:
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* returns ansi codepage corrosponding to the locale.
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*
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*Exceptions:
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* return -1
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*
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*******************************************************************************/
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int __cdecl __ansicp(int lcid)
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{
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char ch[7];
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int ret;
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ch[6] = 0;
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if (!GetLocaleInfoA(lcid, LOCALE_IDEFAULTANSICODEPAGE, ch, 6))
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ret = -1;
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else
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ret = atol(ch);
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return ret;
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}
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/***
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*int __cdecl __convertcp - converts string from one code page to other.
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*
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*Purpose:
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* Convert string from one code page to other.
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*
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*Entry:
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* int fromCP - Codepage to convert from
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* int toCP - Codepage to convert to
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* const char *lpSrcStr - String to be converted
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* int *pcchSrc - Length of lpSrcStr.
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* char *lpDestSrc - Destenation string. If NULL, create new string.
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* char cchDest - Destenation string length. No use if lpDestStr = NULL
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*
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*Exit:
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* returns pointer to new string (or Destination string)
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*
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*Exceptions:
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* return NULL
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*
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*******************************************************************************/
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char * __cdecl __convertcp(int fromCP,
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int toCP,
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const char *lpSrcStr,
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int *pcchSrc,
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char *lpDestStr,
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int cchDest
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)
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{
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wchar_t *wbuffer;
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char *cbuffer = NULL;
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int malloc_flag = 0 ;
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int buff_size;
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int cchSrc = *pcchSrc;
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int sb = FALSE;
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if (fromCP != toCP)
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{
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CPINFO cpi;
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// Find if both the codepages have no MBCS
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if ( GetCPInfo(fromCP, &cpi))
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{
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if ( cpi.MaxCharSize == 1 && GetCPInfo(toCP, &cpi))
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if (cpi.MaxCharSize == 1)
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sb = TRUE;
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}
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// If no MBCS in both then set buff_size and use if for all allocation
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if (sb)
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{
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if ( cchSrc != -1)
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buff_size = cchSrc;
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else
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//NULL character included
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buff_size = (int)strlen(lpSrcStr) + 1;
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}
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// If sb then no need to find buff_size
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if ( !sb && !(buff_size = MultiByteToWideChar( fromCP,
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MB_PRECOMPOSED,
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lpSrcStr,
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cchSrc,
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NULL,
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0 )) )
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return NULL;
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/* allocate enough space for wide chars */
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__try {
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wbuffer = (wchar_t *)_alloca( sizeof(wchar_t) * buff_size);
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(void)memset( wbuffer, 0, sizeof(wchar_t) * buff_size);
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}
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__except( EXCEPTION_EXECUTE_HANDLER ) {
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_resetstkoflw();
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wbuffer = NULL;
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}
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if ( wbuffer == NULL ) {
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if ( (wbuffer = (wchar_t *)_calloc_crt(sizeof(wchar_t), buff_size)) == NULL)
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return NULL;
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malloc_flag++;
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}
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/* do the conversion to WideChar */
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if ( 0 != MultiByteToWideChar( fromCP,
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MB_PRECOMPOSED,
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lpSrcStr,
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cchSrc,
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wbuffer,
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buff_size ))
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{
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if ( lpDestStr != NULL)
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{
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if (WideCharToMultiByte(toCP,
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0,
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wbuffer,
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buff_size,
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lpDestStr,
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cchDest,
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NULL,
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NULL))
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cbuffer = lpDestStr;
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} else {
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/* do the conversion back to MultiByte using ANSI_CP */
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if ( sb || (buff_size = WideCharToMultiByte( toCP,
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0,
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wbuffer,
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buff_size,
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0,
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0,
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NULL,
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NULL)))
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{
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if ( (cbuffer = (char *)_calloc_crt(sizeof(char),buff_size)) != NULL)
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{
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if ( 0 == (buff_size = WideCharToMultiByte( toCP,
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0,
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wbuffer,
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buff_size,
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cbuffer,
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buff_size,
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NULL,
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NULL)))
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{
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_free_crt(cbuffer);
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cbuffer = NULL;
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} else {
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if ( cchSrc != -1)
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*pcchSrc = buff_size;
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}
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}
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}
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}
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}
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}
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if (malloc_flag)
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_free_crt(wbuffer);
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return cbuffer;
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}
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