Problem with writing to file

[Affected1]

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:

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?

[modoran]

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).

[ne555]

If you are not working with binary data, consider using fputs()

[Affected1]

How i could get the buffer size?

[ne555]

You created the buffer, ¿don't you?

[Affected1]

I dint create any buffers. I just call that log function with a string and then it should write it to a log file.

[JLBorges]

If this is C++

#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

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) ;
        }
    }
}

[Affected1]

Thanks JLBorges! Now its working perfectly with slight adjustments :)