Retro68/gcc/newlib/libc/sys/sysmec/sbrk.c
2012-03-27 01:51:53 +02:00

37 lines
630 B
C

#include <_ansi.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "sys/syscall.h"
int errno;
int __trap0 ();
#define TRAP0(f, p1, p2, p3) __trap0(f, (p1), (p2), (p3))
caddr_t
_sbrk (size_t incr)
{
extern char end; /* Defined by the linker */
static char *heap_end;
char *prev_heap_end;
#if 0
char *sp = (char *)stack_ptr;
#else
char *sp = (char *)&sp;
#endif
if (heap_end == 0)
{
heap_end = &end;
}
prev_heap_end = heap_end;
if (heap_end + incr > sp)
{
_write (1, "Heap and stack collision\n", 25);
abort ();
}
heap_end += incr;
return (caddr_t) prev_heap_end;
}