winamp/Src/nu/AutoChar.h

#ifndef NULLSOFT_AUTOCHARH
#define NULLSOFT_AUTOCHARH
#ifdef WIN32
#include <windows.h>


inline char *AutoCharDupN(const wchar_t *convert, size_t len, UINT codePage = CP_ACP, UINT flags=0)
{
	if (!convert)
		return 0;
	int size = WideCharToMultiByte(codePage, flags, convert, (int)len, 0, 0, NULL, NULL);
	
	if (!size)
		return 0;

	char *narrow = (char *)malloc((size+1)*sizeof(char));
	if ( narrow == 0 )
		return 0;

	if (!WideCharToMultiByte(codePage, flags, convert, (int)len, narrow, size, NULL, NULL))
	{
		free(narrow);
		narrow=0;
	}
	else
		narrow[size]=0;

	return narrow;
}

inline char *AutoCharDup(const wchar_t *convert, UINT codePage = CP_ACP, UINT flags=0)
{
	if (!convert)
		return 0;

	int size = WideCharToMultiByte(codePage, flags, convert, -1, 0, 0, NULL, NULL);

	if (!size)
		return 0;

	char *narrow = (char *)malloc(size*sizeof(char));
	if ( narrow == 0 )
		return 0;

	if (!WideCharToMultiByte(codePage, flags, convert, -1, narrow, size, NULL, NULL))
	{
		free(narrow);
		narrow=0;
	}
	return narrow;
}

class AutoChar
{
public:
	AutoChar(const wchar_t *convert, UINT codePage = CP_ACP, UINT flags=0) : narrow(0)
	{
		narrow = AutoCharDup(convert, codePage, flags);
	}
	~AutoChar()
	{
		free(narrow);
		narrow=0;
	}
	operator const char *()
	{
		return narrow;
	}
	operator char *()
	{
		return narrow;
	}
protected:
	AutoChar() : narrow(0)
	{
	}
	char *narrow;
};

class AutoCharGrow
{
public:
	AutoCharGrow()
	{
		narrow=0;
		size=0;
	}

	~AutoCharGrow()
	{
		free(narrow);
	}

	const char *Convert(const wchar_t *convert, UINT codePage = CP_ACP, UINT flags=0, size_t *cch=0)
	{
		size_t new_size = WideCharToMultiByte(codePage, flags, convert, -1, 0, 0, NULL, NULL);

		if (!new_size)
			return 0;

		if ((size_t)new_size > size)
		{
			free(narrow);
			narrow = (char *)malloc(new_size * sizeof(char));
			if (!narrow)
			{
				size=0;
				return 0;
			}
			size=(size_t)new_size;
		}

		if (!WideCharToMultiByte(codePage, flags, convert, -1, narrow, (int)new_size, NULL, NULL))
		{
			return 0;
		}

		if (cch)
			*cch=new_size-1;

		return narrow;
	}

protected:
	char *narrow;
	size_t size;
};
class AutoCharN : public AutoChar
{
public:
	AutoCharN(const wchar_t *convert, size_t len, UINT codePage = CP_ACP, UINT flags=0)
	{
		narrow = AutoCharDupN(convert, len, codePage, flags);
	}
};
#else
#include <stdlib.h>
#include <wchar.h>

inline char *AutoCharDup(const wchar_t *convert)
{
	if (!convert)
		return 0;

	size_t size = wcslen(convert)+1;

	if (!size)
		return 0;

	char *narrow = (char *)malloc(size*sizeof(char));
	if ( narrow == 0 )
		return 0;

	if (wcstombs(narrow, convert, size) == (size_t)-1)
	{
		free(narrow);
		narrow=0;
	}
	return narrow;
}


class AutoChar
{
public:

	AutoChar(const wchar_t *convert) : narrow(0)
	{
		narrow = AutoCharDup(convert);
	}
	~AutoChar()
	{
		free(narrow);
		narrow=0;
	}
	operator const char *()
	{
		return narrow;
	}
	operator char *()
	{
		return narrow;
	}
private:
	char *narrow;
};
#endif

#endif