1 /*** 2 *mbsncol.c - Collate n characters of two MBCS strings 3 * 4 * Copyright (c) Microsoft Corporation. All rights reserved. 5 * 6 *Purpose: 7 * Collate n characters 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 * _mbsncoll(s1, s2, n) - Collate n characters of two MBCS strings 21 * 22 *Purpose: 23 * Collates up to n charcters of two strings for lexical order. 24 * Strings are collated on a character basis, not a byte basis. 25 * 26 *Entry: 27 * unsigned char *s1, *s2 = strings to collate 28 * size_t n = maximum number of characters to collate 29 * 30 *Exit: 31 * Returns <0 if s1 < s2 32 * Returns 0 if s1 == s2 33 * Returns >0 if s1 > s2 34 * Returns _NLSCMPERROR is something went wrong 35 * 36 *Exceptions: 37 * Input parameters are validated. Refer to the validation section of the function. 38 * 39 *******************************************************************************/ 40 41 extern "C" int __cdecl _mbsncoll_l( 42 const unsigned char *s1, 43 const unsigned char *s2, 44 size_t n, 45 _locale_t plocinfo 46 ) 47 { 48 int ret; 49 size_t bcnt1, bcnt2; 50 _LocaleUpdate _loc_update(plocinfo); 51 52 if (n == 0) 53 return 0; 54 55 /* validation section */ 56 _VALIDATE_RETURN(s1 != nullptr, EINVAL, _NLSCMPERROR); 57 _VALIDATE_RETURN(s2 != nullptr, EINVAL, _NLSCMPERROR); 58 _VALIDATE_RETURN(n <= INT_MAX, EINVAL, _NLSCMPERROR); 59 60 if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0) 61 return _strncoll_l((const char *)s1, (const char *)s2, n, plocinfo); 62 63 bcnt1 = _mbsnbcnt_l(s1, n, _loc_update.GetLocaleT()); 64 bcnt2 = _mbsnbcnt_l(s2, n, _loc_update.GetLocaleT()); 65 66 if ( 0 == (ret = __acrt_CompareStringA( 67 _loc_update.GetLocaleT(), 68 _loc_update.GetLocaleT()->mbcinfo->mblocalename, 69 SORT_STRINGSORT, 70 (const char *)s1, 71 (int)bcnt1, 72 (char *)s2, 73 (int)bcnt2, 74 _loc_update.GetLocaleT()->mbcinfo->mbcodepage )) ) 75 { 76 errno = EINVAL; 77 return _NLSCMPERROR; 78 } 79 80 return ret - 2; 81 82 } 83 84 extern "C" int (__cdecl _mbsncoll)( 85 const unsigned char *s1, 86 const unsigned char *s2, 87 size_t n 88 ) 89 { 90 return _mbsncoll_l(s1, s2, n, nullptr); 91 } 92