#include <stdio.h>
#include <stdarg.h>
#include "printf.h"

/*
 * my_printf("str: %s\nchr: %c\nhex: %x\nint: %d\noct: %o",
              1, 1, 1, 1, 1);
*/

int
main()
{
    my_printf("str: %s\nchr: %c\nhex: %x\nint: %d\noct: %o", 
              "hi", 'a', 0x32, 10, 8);
    return 0;
}

void
my_printf(char *format, ...)
{
    char *c; // a char in the `format` string
    va_list args;

    va_start(args, format);

    for (c = format; *c != '\0'; c++)
    {
        while (*c != '%')
        {
            putchar(*c);
            c++;
        }

        c++;
        
        switch(*c)
        {
            case 'c': 
            {
                putchar(va_arg(args, int));
                putchar('\n');
                break;
            }

            case 'd': 
            {
                puts(convert(va_arg(args, int), 10));
                break;
            }

            case 'o': 
            {
                puts(convert(va_arg(args, unsigned int), 8));
                break;
            }

            case 'x': 
            {
                puts(convert(va_arg(args, unsigned int), 16));
                break;
            }

            case 's': 
            {
                puts(va_arg(args, char*));
                break;
            }
        }
    }

    va_end(args);
}


char*
convert(unsigned int num, int base)
{
	static char rep[]= "0123456789ABCDEF";
	static char buffer[50]; 
	char *ptr; 
	
	ptr = &buffer[49]; 
	*ptr = '\0'; 
	
	do { 
		*--ptr = rep[num%base]; 
		num /= base; 
	} while (num != 0); 
	
	return(ptr); 
}