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https://github.com/reactos/reactos.git
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04e0dc4a7a
Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3 License: MIT
87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
/***
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*mbscmp.c - Compare MBCS strings
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*
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* Copyright (c) Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Compare MBCS strings
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*
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*******************************************************************************/
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#ifndef _MBCS
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#error This file should only be compiled with _MBCS defined
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#endif
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#include <corecrt_internal_mbstring.h>
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#include <locale.h>
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#include <string.h>
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#pragma warning(disable:__WARNING_POTENTIAL_BUFFER_OVERFLOW_NULLTERMINATED) // 26018
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/***
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* _mbscmp - Compare MBCS strings
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*
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*Purpose:
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* Compares two strings in ordinal order.
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* Single byte strings are compared byte-by-byte
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* Double byte strings are compared by character
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* (basically ensuring that double byte sequences are higher than single byte)
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* UTF-8 is compared byte-by-byte, which work since its the same as character order.
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*
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*Entry:
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* char *s1, *s2 = strings to compare
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*
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*WARNING:
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* No validation for improper UTF-8 strings, mixed up lead/trail byte orders are not defined.
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*
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*Exit:
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* Returns <0 if s1 < s2
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* Returns 0 if s1 == s2
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* Returns >0 if s1 > s2
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* Returns _NLSCMPERROR is something went wrong
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*
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*Exceptions:
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* Input parameters are validated. Refer to the validation section of the function.
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*
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*******************************************************************************/
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extern "C" int __cdecl _mbscmp_l(
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const unsigned char *s1,
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const unsigned char *s2,
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_locale_t plocinfo
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)
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{
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unsigned short c1, c2;
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_LocaleUpdate _loc_update(plocinfo);
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/* validation section */
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_VALIDATE_RETURN(s1 != nullptr, EINVAL, _NLSCMPERROR);
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_VALIDATE_RETURN(s2 != nullptr, EINVAL, _NLSCMPERROR);
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if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0)
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return strcmp((const char *)s1, (const char *)s2);
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for (;;) {
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c1 = *s1++;
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if ( _ismbblead_l(c1, _loc_update.GetLocaleT()) )
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c1 = ( (*s1 == '\0') ? 0 : ((c1<<8) | *s1++) );
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c2 = *s2++;
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if ( _ismbblead_l(c2, _loc_update.GetLocaleT()) )
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c2 = ( (*s2 == '\0') ? 0 : ((c2<<8) | *s2++) );
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if (c1 != c2)
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return (c1 > c2) ? 1 : -1;
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if (c1 == 0)
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return 0;
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}
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}
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extern "C" int (__cdecl _mbscmp)(
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const unsigned char *s1,
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const unsigned char *s2
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)
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{
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return _mbscmp_l(s1, s2, nullptr);
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}
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