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;
}