newlib-cygwin/newlib/libc/sys/sysvi386/sbrk.c

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2000-02-18 03:39:52 +08:00
extern end;
static void *curbrk = (char*)&end;
void *
sbrk(incr)
int incr; {
extern int errno;
extern int _brk(void *);
void *ptr = curbrk;
int t;
if (incr == 0)
return curbrk;
t = _brk (curbrk + incr);
if (t == -1 && errno)
return (void *)-1;
curbrk = ((char *)curbrk) + incr;
return ptr;
}