warning: unknown conversion type character ‘"’ in format when using dprintf

Question

I am getting this compiler (gcc 4.5) warning:

Formatter.cpp:23: warning: unknown conversion type character ‘"’ in format

And this is my code at line 23:

dprintf (fd, "<svg width=\"100%\" height=\"100%\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">");

Can somebody spot what am I doing wrong and what causes the warning ?

Answer 1

You need to escape all occurences of % - the printf family of function treats them as format specifiers and tries to parse the next character (for instance as in %s). You escape them by doubling (%%).