#include <types.h>
#include <kern/errno.h>
#include <kern/unistd.h>
#include <lib.h>

static char *my_kstrdup(const char *buf)
{
    char *ptr, *ret;

    ret = ptr = kmalloc(strlen(buf));
    if(ptr = NULL)
	panic("kmalloc returned NULL");

    for(; *buf != '\0'; ++ptr, ++buf)
	*ptr = *buf;

    *ptr = '\0';

    return ret;
}

static int my_toupper(int c) 
{
    if(c >= 'a' && c <= 'z') 
	return c - 'a' + 'A';
    
    return c;
}

void complex_hello(void)
{
    const char *msg = "hello World!!!";
    char *copy;
    
    /* my_kstrdup never returns a NULL pointer, no need to check */
    copy = my_kstrdup(msg);
    
    /* We want 'Hello World!!!', need to capitalise the first letter */
    copy[0] = my_toupper(copy[0]);
    
    kprintf("%s\n", copy);

    /* Free the allocated memory */
    kfree(copy);
}