// This is free and unencumbered software released into the public domain.
//
// Anyone is free to copy, modify, publish, use, compile, sell, or
// distribute this software, either in source code form or as a compiled
// binary, for any purpose, commercial or non-commercial, and by any
// means.

#include <stdarg.h>
#include <stdint.h>
#include "murax.h"

extern char *malloc();
extern int printf(const char *format, ...);
extern void putchar(char c);

void putchar(char c){
	uart_write(UART, c);
}



char heap_memory[1024];
int heap_memory_used = 0;

char *malloc(int size)
{
	char *p = heap_memory + heap_memory_used;
	// printf("[malloc(%d) -> %d (%d..%d)]", size, (int)p, heap_memory_used, heap_memory_used + size);
	heap_memory_used += size;
	if (heap_memory_used > 1024)
		asm volatile ("ebreak");
	return p;
}

static void printf_c(int c)
{
	putchar(c);
}

static void printf_s(char *p)
{
	while (*p)
		putchar(*(p++));
}

static void printf_d(int val)
{
	char buffer[32];
	char *p = buffer;
	if (val < 0) {
		printf_c('-');
		val = -val;
	}
	while (val || p == buffer) {
		*(p++) = '0' + val % 10;
		val = val / 10;
	}
	while (p != buffer)
		printf_c(*(--p));
}

int printf(const char *format, ...)
{
	int i;
	va_list ap;

	va_start(ap, format);

	for (i = 0; format[i]; i++)
		if (format[i] == '%') {
			while (format[++i]) {
				if (format[i] == 'c') {
					printf_c(va_arg(ap,int));
					break;
				}
				if (format[i] == 's') {
					printf_s(va_arg(ap,char*));
					break;
				}
				if (format[i] == 'd') {
					printf_d(va_arg(ap,int));
					break;
				}
			}
		} else
			printf_c(format[i]);

	va_end(ap);
}


int puts(char *s){
  while (*s) {
    putchar(*s);
    s++;
  }
  putchar('\n');
  return 0;
}