I have the compiler error:
libvncserver/main.c:245: error: format not a string literal and no format arguments And line 245 is:
fprintf(stderr,buf); where buf is "char buf[256];"
I don't see what is wrong with line 245 and how can I fix it? When I comment out that line, the program compiles.
What is wrong is that any printf function expects a const char * while you are providing just a char *. Since the buffer can contain whatever you want the compiler is not sure that it will contain a correct format string. Just do
fprintf(stderr,"%s",buf); so that it will be sure that you are not going to pass something strange.
If buf contains a format specifier like %s, the program will try to read an argument that you haven't provided, which might crash your program or corrupt your stack. GCC is warning you about that. Change it to this:
fprintf(stderr, "%s", buf);