/*** *w_map.c - W version of LCMapString. * * Copyright (c) 1993-1997, Microsoft Corporation. All rights reserved. * *Purpose: * Use either LCMapStringA or LCMapStringW depending on which is available * *******************************************************************************/ #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++; if (!*cp) return cp - string; return cnt; } /*** *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 (0 != LCMapStringA(0, LCMAP_LOWERCASE, "\0", 1, NULL, 0)) f_use = USE_A; else return 0; } /* * 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) { int retval; int inbuff_size; int outbuff_size; unsigned char *inbuffer; unsigned char *outbuffer; /* * 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 == code_page) code_page = __lc_codepage; /* find out how big a buffer we need (includes NULL if any) */ if ( 0 == (inbuff_size = WideCharToMultiByte( code_page, WC_COMPOSITECHECK | WC_SEPCHARS, 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) { inbuffer = NULL; } if ( inbuffer == NULL ) return 0; /* do the conversion */ if ( 0 == WideCharToMultiByte( code_page, WC_COMPOSITECHECK | WC_SEPCHARS, lpSrcStr, cchSrc, inbuffer, inbuff_size, NULL, NULL ) ) return 0; /* get size required for string mapping */ if ( 0 == (outbuff_size = LCMapStringA( Locale, dwMapFlags, inbuffer, inbuff_size, NULL, 0 )) ) return 0; /* allocate enough space for chars and NULL */ __try { outbuffer = (unsigned char *)_alloca( outbuff_size * sizeof(char) ); } __except(EXCEPTION_EXECUTE_HANDLER) { outbuffer = NULL; } if ( outbuffer == NULL ) return 0; /* do string mapping */ if ( 0 == LCMapStringA( Locale, dwMapFlags, inbuffer, inbuff_size, outbuffer, outbuff_size ) ) return 0; 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 )) ) return 0; } else { /* convert mapping */ if ( 0 == (retval = MultiByteToWideChar( code_page, MB_PRECOMPOSED, outbuffer, outbuff_size, lpDestStr, cchDest )) ) return 0; } } return retval; } else /* f_use is neither USE_A nor USE_W */ return 0; }