StandardPlatformString.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "GenericPlatform/GenericPlatformStricmp.h"
#include "GenericPlatform/GenericPlatformString.h"
#include "Misc/Char.h"
 
// IWYU pragma: begin_exports
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
// IWYU pragma: end_exports
 
#if PLATFORM_USE_GENERIC_STRING_IMPLEMENTATION && !PLATFORM_TCHAR_IS_CHAR16
 
/**
* Standard implementation
**/
struct FStandardPlatformString : public FGenericPlatformString
{
    using FGenericPlatformString::Stricmp;
    using FGenericPlatformString::Strncmp;
    using FGenericPlatformString::Strnicmp;
 
    template <typename CharType>
    static inline CharType* Strupr(CharType* Dest, SIZE_T DestCount)
    {
        for (CharType* Char = Dest; *Char && DestCount > 0; Char++, DestCount--)
        {
            *Char = TChar<CharType>::ToUpper(*Char);
        }
        return Dest;
    }
 
public:
 
    /**
     * Unicode implementation
     **/
    static FORCEINLINE WIDECHAR* Strcpy(WIDECHAR* Dest, SIZE_T DestCount, const WIDECHAR* Src)
    {
// Skip suggestions about using wcscpy_s instead.
PRAGMA_DISABLE_DEPRECATION_WARNINGS
        return wcscpy(Dest, Src);
PRAGMA_ENABLE_DEPRECATION_WARNINGS
    }
 
    static FORCEINLINE WIDECHAR* Strncpy(WIDECHAR* Dest, const WIDECHAR* Src, SIZE_T MaxLen)
    {
// Skip suggestions about using wcsncpy_s instead.
PRAGMA_DISABLE_DEPRECATION_WARNINGS
        wcsncpy(Dest, Src, MaxLen-1);
PRAGMA_ENABLE_DEPRECATION_WARNINGS
        Dest[MaxLen-1]=0;
        return Dest;
    }
 
    static FORCEINLINE WIDECHAR* Strcat(WIDECHAR* Dest, SIZE_T DestCount, const WIDECHAR* Src)
    {
// Skip suggestions about using wcscat_s instead.
PRAGMA_DISABLE_DEPRECATION_WARNINGS
        return (WIDECHAR*)wcscat( Dest, Src );
PRAGMA_ENABLE_DEPRECATION_WARNINGS
    }
 
    static FORCEINLINE int32 Strcmp( const WIDECHAR* String1, const WIDECHAR* String2 )
    {
        return wcscmp(String1, String2);
    }
 
    static FORCEINLINE int32 Strncmp( const WIDECHAR* String1, const WIDECHAR* String2, SIZE_T Count )
    {
        return wcsncmp( String1, String2, Count );
    }
 
    static FORCEINLINE int32 Strlen( const WIDECHAR* String )
    {
        return (int32)wcslen( String );
    }
 
    static FORCEINLINE int32 Strnlen( const WIDECHAR* String, SIZE_T StringSize )
    {
        return (int32)wcsnlen_s( String, StringSize );
    }
 
    static FORCEINLINE const WIDECHAR* Strstr( const WIDECHAR* String, const WIDECHAR* Find)
    {
        return wcsstr( String, Find );
    }
 
    static FORCEINLINE const WIDECHAR* Strchr( const WIDECHAR* String, WIDECHAR C)
    {
        return wcschr( String, C );
    }
 
    static FORCEINLINE const WIDECHAR* Strrchr( const WIDECHAR* String, WIDECHAR C)
    {
        return wcsrchr( String, C );
    }
 
    static FORCEINLINE int32 Atoi(const WIDECHAR* String)
    {
        return (int32)wcstol( String, NULL, 10 );
    }
 
    static FORCEINLINE int64 Atoi64(const WIDECHAR* String)
    {
        return wcstoll( String, NULL, 10 );
    }
 
    static FORCEINLINE float Atof(const WIDECHAR* String)
    {
        return wcstof( String, NULL );
    }
 
    static FORCEINLINE double Atod(const WIDECHAR* String)
    {
        return wcstod( String, NULL );
    }
 
    static FORCEINLINE int32 Strtoi( const WIDECHAR* Start, WIDECHAR** End, int32 Base )
    {
        return (int32)wcstol( Start, End, Base );
    }
 
    static FORCEINLINE int64 Strtoi64( const WIDECHAR* Start, WIDECHAR** End, int32 Base )
    {
        return wcstoll( Start, End, Base );
    }
 
    static FORCEINLINE uint64 Strtoui64( const WIDECHAR* Start, WIDECHAR** End, int32 Base )
    {
        return wcstoull( Start, End, Base );
    }
 
    static FORCEINLINE WIDECHAR* Strtok(WIDECHAR* StrToken, const WIDECHAR* Delim, WIDECHAR** Context)
    {
// Skip suggestions about using wcstok_s instead.
PRAGMA_DISABLE_DEPRECATION_WARNINGS
        return wcstok(StrToken, Delim, Context);
PRAGMA_ENABLE_DEPRECATION_WARNINGS
    }
 
#if PLATFORM_USE_SYSTEM_VSWPRINTF
    static int32 GetVarArgs( WIDECHAR* Dest, SIZE_T DestSize, const WIDECHAR*& Fmt, va_list ArgPtr )
    {
#if PLATFORM_USE_LS_SPEC_FOR_WIDECHAR
        // fix up the Fmt string, as fast as possible, without using an FString
        const WIDECHAR* OldFormat = Fmt;
        WIDECHAR* NewFormat = (WIDECHAR*)alloca((Strlen(Fmt) * 2 + 1) * sizeof(WIDECHAR));
 
        int32 NewIndex = 0;
 
        for (; *OldFormat != 0; NewIndex++, OldFormat++)
        {
            // fix up %s -> %ls and %c -> %lc
            if (OldFormat[0] == LITERAL(WIDECHAR, '%'))
            {
                NewFormat[NewIndex++] = *OldFormat++;
 
                if (*OldFormat == LITERAL(WIDECHAR, '%'))
                {
                    NewFormat[NewIndex] = *OldFormat;
                }
                else
                {
                    const WIDECHAR* NextChar = OldFormat;
 
                    while(*NextChar != 0 && !FChar::IsAlpha(*NextChar))
                    {
                        NewFormat[NewIndex++] = *NextChar;
                        ++NextChar;
                    };
 
                    if (*NextChar == LITERAL(WIDECHAR, 's') || *NextChar == LITERAL(WIDECHAR, 'c'))
                    {
                        NewFormat[NewIndex++] = LITERAL(WIDECHAR, 'l');
                        NewFormat[NewIndex] = *NextChar;
                    }
                    else if (*NextChar == LITERAL(WIDECHAR, 'S'))
                    {
                        NewFormat[NewIndex] = LITERAL(WIDECHAR, 's');
                    }
                    else
                    {
                        NewFormat[NewIndex] = *NextChar;
                    }
 
                    OldFormat = NextChar;
                }
            }
            else
            {
                NewFormat[NewIndex] = *OldFormat;
            }
        }
        NewFormat[NewIndex] = 0;
        int32 Result = vswprintf( Dest, DestSize, NewFormat, ArgPtr);
#else
        int32 Result = vswprintf( Dest, DestSize, Fmt, ArgPtr);
#endif
        va_end( ArgPtr );
        return Result;
    }
#else // PLATFORM_USE_SYSTEM_VSWPRINTF
    static int32 GetVarArgs( WIDECHAR* Dest, SIZE_T DestSize, const WIDECHAR*& Fmt, va_list ArgPtr );
#endif // PLATFORM_USE_SYSTEM_VSWPRINTF
 
    /**
     * Ansi implementation
     **/
    static FORCEINLINE ANSICHAR* Strcpy(ANSICHAR* Dest, SIZE_T DestCount, const ANSICHAR* Src)
    {
// Skip suggestions about using strcpy_s instead.
PRAGMA_DISABLE_DEPRECATION_WARNINGS
        return strcpy( Dest, Src );
PRAGMA_ENABLE_DEPRECATION_WARNINGS
    }
 
    static FORCEINLINE ANSICHAR* Strncpy(ANSICHAR* Dest, const ANSICHAR* Src, SIZE_T MaxLen)
    {
// Skip suggestions about using strncpy_s instead.
PRAGMA_DISABLE_DEPRECATION_WARNINGS
        ::strncpy(Dest, Src, MaxLen);
PRAGMA_ENABLE_DEPRECATION_WARNINGS
        Dest[MaxLen-1]=0;
        return Dest;
    }
 
    static FORCEINLINE ANSICHAR* Strcat(ANSICHAR* Dest, SIZE_T DestCount, const ANSICHAR* Src)
    {
// Skip suggestions about using strcat_s instead.
PRAGMA_DISABLE_DEPRECATION_WARNINGS
        return strcat( Dest, Src );
PRAGMA_ENABLE_DEPRECATION_WARNINGS
    }
 
    static FORCEINLINE int32 Strcmp( const ANSICHAR* String1, const ANSICHAR* String2 )
    {
        return strcmp(String1, String2);
    }
 
    static FORCEINLINE int32 Strncmp( const ANSICHAR* String1, const ANSICHAR* String2, SIZE_T Count )
    {
        return strncmp( String1, String2, Count );
    }
 
    static FORCEINLINE int32 Strlen( const ANSICHAR* String )
    {
        return (int32)strlen( String );
    }
 
    static FORCEINLINE int32 Strnlen( const ANSICHAR* String, SIZE_T StringSize )
    {
        return (int32)strnlen_s( String, StringSize );
    }
 
    static FORCEINLINE const ANSICHAR* Strstr( const ANSICHAR* String, const ANSICHAR* Find)
    {
        return strstr(String, Find);
    }
 
    static FORCEINLINE const ANSICHAR* Strchr( const ANSICHAR* String, ANSICHAR C)
    {
        return strchr(String, C);
    }
 
    static FORCEINLINE const ANSICHAR* Strrchr( const ANSICHAR* String, ANSICHAR C)
    {
        return strrchr(String, C);
    }
 
    static FORCEINLINE int32 Atoi(const ANSICHAR* String)
    {
        return atoi( String );
    }
 
    static FORCEINLINE int64 Atoi64(const ANSICHAR* String)
    {
        return strtoll( String, NULL, 10 );
    }
 
    static FORCEINLINE float Atof(const ANSICHAR* String)
    {
        return (float)atof( String );
    }
 
    static FORCEINLINE double Atod(const ANSICHAR* String)
    {
        return atof( String );
    }
 
    static FORCEINLINE int32 Strtoi( const ANSICHAR* Start, ANSICHAR** End, int32 Base )
    {
        return (int32)strtol( Start, End, Base );
    }
 
    static FORCEINLINE int64 Strtoi64( const ANSICHAR* Start, ANSICHAR** End, int32 Base )
    {
        return strtoll(Start, End, Base);
    }
 
    static FORCEINLINE uint64 Strtoui64( const ANSICHAR* Start, ANSICHAR** End, int32 Base )
    {
        return strtoull(Start, End, Base);
    }
 
    static FORCEINLINE ANSICHAR* Strtok(ANSICHAR* StrToken, const ANSICHAR* Delim, ANSICHAR** Context)
    {
// Skip suggestions about using strtok_s instead.
PRAGMA_DISABLE_DEPRECATION_WARNINGS
        return strtok(StrToken, Delim);
PRAGMA_ENABLE_DEPRECATION_WARNINGS
    }
 
    static int32 GetVarArgs( ANSICHAR* Dest, SIZE_T DestSize, const ANSICHAR*& Fmt, va_list ArgPtr )
    {
        int32 Result = vsnprintf(Dest, DestSize, Fmt, ArgPtr);
        va_end( ArgPtr );
        return (Result != -1 && Result < (int32)DestSize) ? Result : -1;
    }
 
    /**
     * UTF8CHAR implementation.
     */
    static FORCEINLINE UTF8CHAR* Strcpy(UTF8CHAR* Dest, SIZE_T DestCount, const UTF8CHAR* Src)
    {
        return (UTF8CHAR*)Strcpy((ANSICHAR*)Dest, DestCount, (const ANSICHAR*)Src);
    }
 
    static FORCEINLINE UTF8CHAR* Strncpy(UTF8CHAR* Dest, const UTF8CHAR* Src, SIZE_T MaxLen)
    {
        return (UTF8CHAR*)Strncpy((ANSICHAR*)Dest, (const ANSICHAR*)Src, MaxLen);
    }
 
    static FORCEINLINE UTF8CHAR* Strcat(UTF8CHAR* Dest, SIZE_T DestCount, const UTF8CHAR* Src)
    {
        return (UTF8CHAR*)Strcat((ANSICHAR*)Dest, DestCount, (const ANSICHAR*)Src);
    }
 
    static FORCEINLINE int32 Strcmp(const UTF8CHAR* String1, const UTF8CHAR* String2)
    {
        return Strcmp((const ANSICHAR*)String1, (const ANSICHAR*)String2);
    }
 
    static FORCEINLINE int32 Strncmp(const UTF8CHAR* String1, const UTF8CHAR* String2, SIZE_T Count)
    {
        return Strncmp((const ANSICHAR*)String1, (const ANSICHAR*)String2, Count);
    }
 
    static FORCEINLINE int32 Strlen(const UTF8CHAR* String)
    {
        return Strlen((const ANSICHAR*)String);
    }
 
    static FORCEINLINE int32 Strnlen(const UTF8CHAR* String, SIZE_T StringSize)
    {
        return Strnlen((const ANSICHAR*)String, StringSize);
    }
 
    static FORCEINLINE const UTF8CHAR* Strstr(const UTF8CHAR* String, const UTF8CHAR* Find)
    {
        return (const UTF8CHAR*)Strstr((const ANSICHAR*)String, (const ANSICHAR*)Find);
    }
 
    static FORCEINLINE const UTF8CHAR* Strchr(const UTF8CHAR* String, UTF8CHAR C)
    {
        return (const UTF8CHAR*)Strchr((const ANSICHAR*)String, (ANSICHAR)C);
    }
 
    static FORCEINLINE const UTF8CHAR* Strrchr(const UTF8CHAR* String, UTF8CHAR C)
    {
        return (const UTF8CHAR*)Strrchr((const ANSICHAR*)String, (ANSICHAR)C);
    }
 
    static FORCEINLINE int32 Atoi(const UTF8CHAR* String)
    {
        return Atoi((const ANSICHAR*)String);
    }
 
    static FORCEINLINE int64 Atoi64(const UTF8CHAR* String)
    {
        return Atoi64((const ANSICHAR*)String);
    }
 
    static FORCEINLINE float Atof(const UTF8CHAR* String)
    {
        return Atof((const ANSICHAR*)String);
    }
 
    static FORCEINLINE double Atod(const UTF8CHAR* String)
    {
        return Atod((const ANSICHAR*)String);
    }
 
    static FORCEINLINE int32 Strtoi(const UTF8CHAR* Start, UTF8CHAR** End, int32 Base)
    {
        return Strtoi((const ANSICHAR*)Start, (ANSICHAR**)End, Base);
    }
 
    static FORCEINLINE int64 Strtoi64(const UTF8CHAR* Start, UTF8CHAR** End, int32 Base)
    {
        return Strtoi64((const ANSICHAR*)Start, (ANSICHAR**)End, Base);
    }
 
    static FORCEINLINE uint64 Strtoui64(const UTF8CHAR* Start, UTF8CHAR** End, int32 Base)
    {
        return Strtoui64((const ANSICHAR*)Start, (ANSICHAR**)End, Base);
    }
 
    static FORCEINLINE UTF8CHAR* Strtok(UTF8CHAR* StrToken, const UTF8CHAR* Delim, UTF8CHAR** Context)
    {
        return (UTF8CHAR*)Strtok((ANSICHAR*)StrToken, (const ANSICHAR*)Delim, (ANSICHAR**)Context);
    }
 
    static FORCEINLINE int32 GetVarArgs(UTF8CHAR* Dest, SIZE_T DestSize, const UTF8CHAR*& Fmt, va_list ArgPtr)
    {
        return GetVarArgs((ANSICHAR*)Dest, DestSize, *(const ANSICHAR**)&Fmt, ArgPtr);
    }
 
    /**
     * UCS2 implementation
     **/
 
    static FORCEINLINE int32 Strlen( const UCS2CHAR* String )
    {
        int32 Result = 0;
        while (*String++)
        {
            ++Result;
        }
 
        return Result;
    }
 
    static FORCEINLINE int32 Strnlen( const UCS2CHAR* String, SIZE_T StringSize )
    {
        int32 Result = 0;
        while (StringSize-- > 0 && *String++)
        {
            ++Result;
        }
 
        return Result;
    }
};
 
#endif