newlib-cygwin/libgloss/iq2000/sbrk.c

31 lines
588 B
C

#include <_ansi.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "trap.h"
caddr_t
_sbrk (size_t incr)
{
extern char __stack; /* Defined by the linker */
extern char _end; /* Defined by the linker */
static char *heap_end;
char *prev_heap_end;
char *sp = (char *)&sp;
if (heap_end == 0)
{
heap_end = &_end;
}
prev_heap_end = heap_end;
heap_end += incr;
if (heap_end > sp)
{
_write (1, "Heap and stack collision\n", 25);
errno = ENOMEM;
return (caddr_t)-1;
}
return (caddr_t) prev_heap_end;
}