Problem with writing to file

I'm trying to make a logger thing for a game engine that logs the important things that happen and errors too.
I ahve this code:
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void Log(char* input)
{
	FILE* log = fopen("engine.log", "a");
	fwrite(input, sizeof(input), 1, log);
	fclose(log);
}


but when i do for example Log("foo is working"); it only outputs the word "foo " to the file. How could i work around this?
sizeof(char*) always returns 4 on x86 platforms. Pass the buffer size to your function as another argument (do not use strlen() if you are working with binary data).
If you are not working with binary data, consider using fputs()
How i could get the buffer size?
You created the buffer, ┬┐don't you?
I dint create any buffers. I just call that log function with a string and then it should write it to a log file.
If this is C++
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#include <fstream>
#include <string>

void log( const std::string& message, const std::string& path2file = "engine.log" )
{
    std::ofstream log( path2file /*.c_str()*/, std::ios_base::app ) ;
    log << message << '\n' ;
}


else if C
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void log( const char* message ) // being const-correct 
{
    if( message != NULL )
    {
        FILE* log = fopen( "engine.log", "a" ) ;
        if( log != NULL )
        {
            fputs( message, log ) ;
            fclose(log) ;
        }
    }
}
Thanks JLBorges! Now its working perfectly with slight adjustments :)
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