1 /*** 2 *mbsnbcol.c - Collate n bytes of two MBCS strings 3 * 4 * Copyright (c) Microsoft Corporation. All rights reserved. 5 * 6 *Purpose: 7 * Collate n bytes of two MBCS strings 8 * 9 *******************************************************************************/ 10 #ifndef _MBCS 11 #error This file should only be compiled with _MBCS defined 12 #endif 13 14 #include <corecrt_internal_mbstring.h> 15 #include <limits.h> 16 #include <locale.h> 17 #include <string.h> 18 19 /*** 20 * _mbsnbcoll(s1, s2, n) - Collate n bytes of two MBCS strings 21 * 22 *Purpose: 23 * Collates up to n bytes of two strings for lexical order. 24 * 25 *Entry: 26 * unsigned char *s1, *s2 = strings to collate 27 * size_t n = maximum number of bytes to collate 28 * 29 *Exit: 30 * Returns <0 if s1 < s2 31 * Returns 0 if s1 == s2 32 * Returns >0 if s1 > s2 33 * Returns _NLSCMPERROR is something went wrong 34 * 35 *Exceptions: 36 * Input parameters are validated. Refer to the validation section of the function. 37 * 38 *******************************************************************************/ 39 40 extern "C" int __cdecl _mbsnbcoll_l( 41 const unsigned char *s1, 42 const unsigned char *s2, 43 size_t n, 44 _locale_t plocinfo 45 ) 46 { 47 int ret; 48 49 if (n == 0) 50 return 0; 51 52 /* validation section */ 53 _VALIDATE_RETURN(s1 != nullptr, EINVAL, _NLSCMPERROR); 54 _VALIDATE_RETURN(s2 != nullptr, EINVAL, _NLSCMPERROR); 55 _VALIDATE_RETURN(n <= INT_MAX, EINVAL, _NLSCMPERROR); 56 57 _LocaleUpdate _loc_update(plocinfo); 58 59 if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0) 60 return _strncoll_l((const char *)s1, (const char *)s2, n, plocinfo); 61 62 if ( 0 == (ret = __acrt_CompareStringA(_loc_update.GetLocaleT(), 63 _loc_update.GetLocaleT()->mbcinfo->mblocalename, 64 SORT_STRINGSORT, 65 (const char *)s1, 66 (int)n, 67 (char *)s2, 68 (int)n, 69 _loc_update.GetLocaleT()->mbcinfo->mbcodepage )) ) 70 { 71 errno = EINVAL; 72 return _NLSCMPERROR; 73 } 74 75 return ret - 2; 76 77 } 78 79 extern "C" int (__cdecl _mbsnbcoll)( 80 const unsigned char *s1, 81 const unsigned char *s2, 82 size_t n 83 ) 84 { 85 return _mbsnbcoll_l(s1, s2, n, nullptr); 86 } 87