/*** *w_map.c - W version of LCMapString. * * Copyright (c) 1993-2001, Microsoft Corporation. All rights reserved. * *Purpose: * Use either LCMapStringA or LCMapStringW depending on which is available * *Revision History: * 09-14-93 CFW Module created. * 09-17-93 CFW Use unsigned chars. * 09-23-93 CFW Correct NLS API params and comments about same. * 10-07-93 CFW Optimize WideCharToMultiByte, use NULL default char. * 10-22-93 CFW Test for invalid MB chars using global preset flag. * 11-09-93 CFW Allow user to pass in code page. * 11-18-93 CFW Test for entry point function stubs. * 02-23-94 CFW Use W flavor whenever possible. * 03-31-94 CFW Include awint.h. * 07-26-94 CFW Bug fix #14730, LCMapString goes past NULLs. * 12-21-94 CFW Remove invalid MB chars NT 3.1 hack. * 12-27-94 CFW Call direct, all OS's have stubs. * 01-10-95 CFW Debug CRT allocs. * 02-15-97 RDK For narrow mapping, try W version first so Windows NT * can process nonANSI codepage correctly. * 03-16-97 RDK Added error flag to __crtLCMapStringA. * 05-09-97 GJF Split off from aw_map.c. Revised to use _alloca * instead of malloc. Also, reformatted. * 05-27-98 GJF Changed wcsncnt() so that it will never examine the * (cnt + 1)-th byte of the string. * 08-18-98 GJF Use _malloc_crt if _alloca fails. * 04-28-99 GJF Changed dwFlags arg value to 0 in WideCharToMultiByte * calls to avoid problems with codepage 1258 on NT 5.0. * 12-10-99 GB Added support for recovery from stack overflow around * _alloca(). * 05-17-00 GB Use ERROR_CALL_NOT_IMPLEMENTED for existance of W API * 08-23-00 GB Fixed bug with non Ansi CP on Win9x. * *******************************************************************************/ #include #include #include #include #include #include #include #include #define USE_W 1 #define USE_A 2 /*** *int __cdecl wcsncnt - count wide characters in a string, up to n. * *Purpose: * Internal local support function. Counts characters in string before * null. If null not found in n chars, then return n. * *Entry: * const wchar_t *string - start of string * int n - byte count * *Exit: * returns number of wide characaters from start of string to * null (exclusive), up to n. * *Exceptions: * *******************************************************************************/ static int __cdecl wcsncnt ( const wchar_t *string, int cnt ) { int n = cnt; wchar_t *cp = (wchar_t *)string; while (n-- && *cp) cp++; return cnt - n - 1; } /*** *int __cdecl __crtLCMapStringW - Get type information about a wide string. * *Purpose: * Internal support function. Assumes info in wide string format. Tries * to use NLS API call LCMapStringW if available and uses LCMapStringA * if it must. If neither are available it fails and returns 0. * *Entry: * LCID Locale - locale context for the comparison. * DWORD dwMapFlags - see NT\Chicago docs * LPCWSTR lpSrcStr - pointer to string to be mapped * int cchSrc - wide char (word) count of input string * (including NULL if any) * (-1 if NULL terminated) * LPWSTR lpDestStr - pointer to memory to store mapping * int cchDest - wide char (word) count of buffer (including NULL) * int code_page - for MB/WC conversion. If 0, use __lc_codepage * * NOTE: if LCMAP_SORTKEY is specified, then cchDest refers to number * of BYTES, not number of wide chars. The return string will be * a series of bytes with a NULL byte terminator. * *Exit: * Success: if LCMAP_SORKEY: * number of bytes written to lpDestStr (including NULL byte * terminator) * else * number of wide characters written to lpDestStr (including * NULL) * Failure: 0 * *Exceptions: * *******************************************************************************/ int __cdecl __crtLCMapStringW( LCID Locale, DWORD dwMapFlags, LPCWSTR lpSrcStr, int cchSrc, LPWSTR lpDestStr, int cchDest, int code_page ) { static int f_use = 0; /* * Look for unstubbed 'preferred' flavor. Otherwise use available flavor. * Must actually call the function to ensure it's not a stub. */ if (0 == f_use) { if (0 != LCMapStringW(0, LCMAP_LOWERCASE, L"\0", 1, NULL, 0)) f_use = USE_W; else if (GetLastError() == ERROR_CALL_NOT_IMPLEMENTED) f_use = USE_A; } /* * LCMapString will map past NULL. Must find NULL if in string * before cchSrc wide characters. */ if (cchSrc > 0) cchSrc = wcsncnt(lpSrcStr, cchSrc); /* Use "W" version */ if (USE_W == f_use) { return LCMapStringW( Locale, dwMapFlags, lpSrcStr, cchSrc, lpDestStr, cchDest ); } /* Use "A" version */ if (USE_A == f_use || f_use == 0) { int retval = 0; int inbuff_size; int outbuff_size; unsigned char *inbuffer; unsigned char *outbuffer; int malloc_flag1 = 0; int malloc_flag2 = 0; int AnsiCP = 0; /* * Convert string and return the requested information. Note that * we are converting to a multibyte string so there is not a * one-to-one correspondence between number of wide chars in the * input string and the number of *bytes* in the buffer. However, * there had *better be* a one-to-one correspondence between the * number of wide characters and the number of multibyte characters * (enforced by WC_SEPCHARS) in the buffer or the resulting mapped * string will be worthless to the user. * */ /* * Use __lc_codepage for conversion if code_page not specified */ if (0 == Locale) Locale = __lc_handle[LC_CTYPE]; if (0 == code_page) code_page = __lc_codepage; /* * Always use Ansi codepage with Ansi WinAPI because they use * Ansi codepage */ if ( code_page != (AnsiCP = __ansicp(Locale))) { if (AnsiCP != -1) code_page = AnsiCP; } /* find out how big a buffer we need (includes NULL if any) */ if ( 0 == (inbuff_size = WideCharToMultiByte( code_page, 0, lpSrcStr, cchSrc, NULL, 0, NULL, NULL )) ) return 0; /* allocate enough space for chars */ __try { inbuffer = (unsigned char *)_alloca( inbuff_size * sizeof(char) ); } __except(EXCEPTION_EXECUTE_HANDLER) { _resetstkoflw(); inbuffer = NULL; } if ( inbuffer == NULL ) { if ( (inbuffer = (unsigned char *)_malloc_crt(inbuff_size * sizeof(char))) == NULL ) return 0; malloc_flag1++; } /* do the conversion */ if ( 0 == WideCharToMultiByte( code_page, 0, lpSrcStr, cchSrc, inbuffer, inbuff_size, NULL, NULL ) ) goto error_cleanup; /* get size required for string mapping */ if ( 0 == (outbuff_size = LCMapStringA( Locale, dwMapFlags, inbuffer, inbuff_size, NULL, 0 )) ) goto error_cleanup; /* allocate enough space for chars and NULL */ __try { outbuffer = (unsigned char *)_alloca( outbuff_size * sizeof(char) ); } __except(EXCEPTION_EXECUTE_HANDLER) { _resetstkoflw(); outbuffer = NULL; } if ( outbuffer == NULL ) { if ( (outbuffer = (unsigned char *)_malloc_crt(outbuff_size * sizeof(char))) == NULL ) goto error_cleanup; malloc_flag2++; } /* do string mapping */ if ( 0 == LCMapStringA( Locale, dwMapFlags, inbuffer, inbuff_size, outbuffer, outbuff_size ) ) goto error_cleanup; if (dwMapFlags & LCMAP_SORTKEY) { /* outbuff_size > cchDest is allowed */ retval = outbuff_size; if (0 != cchDest) /* SORTKEY returns BYTES, just copy */ strncpy( (char *)lpDestStr, (char *)outbuffer, cchDest < outbuff_size ? cchDest : outbuff_size ); } else { if (0 == cchDest) { /* get size required */ if ( 0 == (retval = MultiByteToWideChar( code_page, MB_PRECOMPOSED, outbuffer, outbuff_size, NULL, 0 )) ) goto error_cleanup; } else { /* convert mapping */ if ( 0 == (retval = MultiByteToWideChar( code_page, MB_PRECOMPOSED, outbuffer, outbuff_size, lpDestStr, cchDest )) ) goto error_cleanup; } } error_cleanup: if ( malloc_flag2 ) _free_crt(outbuffer); if ( malloc_flag1 ) _free_crt(inbuffer); return retval; } else /* f_use is neither USE_A nor USE_W */ return 0; }