Fixes issue of medium to large prompts causing crashing with no errors while using color mode.

[trevtravtrev]

• This fixes a major application breaking untraceable error (Large prompts crashing with no error output Large prompts crashing with no error output #122)
• Tested and working

[HCBlackFox]

Nice, this is works!

[michieal]

if I may, what about doing something like this?

// Remove Magic Number, and make a #define:
#define INPUT_BUFFER_SIZE 16384

...

                    char buf[INPUT_BUFFER_SIZE] = {0};
                    int n_read;
                    if(params.use_color) printf(ANSI_BOLD ANSI_COLOR_GREEN);
	                std::string scan_line = std::string ("%") + std::to_string(INPUT_BUFFER_SIZE - 1) + "[^\n]%n%*c";

                    if (scanf(scan_line.c_str(), buf, &n_read) <= 0) {
                        // presumable empty line, consume the newline
                        if (scanf("%*c") <= 0) { /*ignore*/ }
                        n_read=0;
                    }

Mind you, I am really rusty on CPP... so, I am using Alpaca.cpp to get back into programming in c/cpp... That said, I think that this will work, and moves where one changes the input buf[] size to the top of the file.