max80_fw/fw/sbrk.c

/*
 * sbrk allocator
 */

#include <stddef.h>
#include <errno.h>
#include "sys.h"
#include "fw.h"

void *_sbrk(size_t increment)
{
    static size_t cur_brk = (size_t)_end;
    size_t old_brk = cur_brk;
    size_t new_brk = old_brk + increment;

    if (unlikely(new_brk > SRAM_SIZE - STACK_SIZE)) {
	errno = ENOMEM;
	return (void *)(-1);
    }

    cur_brk = new_brk;
    return (void *)old_brk;
}