mirror of
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
101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
/***
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* mbsstr.c - Search for one MBCS string inside another
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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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* Search for one MBCS string inside another
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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.h>
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#include <corecrt_internal_mbstring.h>
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#include <locale.h>
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#include <stddef.h>
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#include <string.h>
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/***
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* _mbsstr - Search for one MBCS string inside another
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*
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*Purpose:
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* Find the first occurrence of str2 in str1.
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*
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*Entry:
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* unsigned char *str1 = beginning of string
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* unsigned char *str2 = string to search for
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*
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*Exit:
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* Returns a pointer to the first occurrence of str2 in
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* str1, or nullptr if str2 does not occur in str1
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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" _CONST_RETURN unsigned char * __cdecl _mbsstr_l(
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const unsigned char *str1,
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const unsigned char *str2,
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_locale_t plocinfo
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)
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{
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unsigned char *cp, *s1, *s2, *endp;
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_LocaleUpdate _loc_update(plocinfo);
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if (_loc_update.GetLocaleT()->mbcinfo->ismbcodepage == 0)
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return (unsigned char *)strstr((const char *)str1, (const char *)str2);
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/* validation section */
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_VALIDATE_RETURN(str2 != nullptr, EINVAL, 0);
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if ( *str2 == '\0')
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return (unsigned char *)str1;
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_VALIDATE_RETURN(str1 != nullptr, EINVAL, 0);
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cp = (unsigned char *) str1;
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endp = (unsigned char *) (str1 + (strlen((const char *)str1) - strlen((const char *)str2)));
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while (*cp && (cp <= endp))
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{
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s1 = cp;
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s2 = (unsigned char *) str2;
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/*
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* MBCS: ok to ++ since doing equality comparison.
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* [This depends on MBCS strings being "legal".]
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*/
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while ( *s1 && *s2 && (*s1 == *s2) )
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s1++, s2++;
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if (!(*s2))
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return(cp); /* success! */
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/*
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* bump pointer to next char
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*/
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if ( _ismbblead_l(*(cp++), _loc_update.GetLocaleT()) )
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{
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/* don't move forward if we have leadbyte, EOS
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means dud string was passed in.
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Don't assert - too low level
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*/
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if(*cp!='\0')
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{
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cp++;
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}
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}
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}
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return(nullptr);
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}
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extern "C" _CONST_RETURN unsigned char * (__cdecl _mbsstr)(
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const unsigned char *str1,
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const unsigned char *str2
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)
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{
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return _mbsstr_l(str1, str2, nullptr);
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}
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