stdlib.c

#include "stdlib.h"

#include "assembly_interface.h"
#include "data_structures/page_table.h"
#include "loader.h"

// naive strategy for now: keep track of highest allocated
// address, don't worry about freeing memory.

void* lowest_free_memory = &kernel_stack_lowest_address;

void* malloc(uint32_t bytes) {
  void* chunk_start = lowest_free_memory;
  lowest_free_memory += bytes;

  if (lowest_free_memory >= current_stack_pointer()) {
    interrupt_out_of_memory();
  }

  return chunk_start;
}

bool isdigit(char c) {
  return c >= '0' && c <= '9';
}

int atoi (const char * str) {
  int value = 0;
  while(isdigit(*str)) {
    value *= 10;
    value += (*str)-'0';
    str++;
  }

  return value;
}