minix/lib/nbsd_libc/sys-minix/sbrk.c

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#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#include <unistd.h>
#ifdef __weak_alias
__weak_alias(sbrk, _sbrk)
#endif
extern char *_brksize;
PUBLIC void *sbrk(incr)
intptr_t incr;
{
char *newsize, *oldsize;
oldsize = _brksize;
newsize = _brksize + incr;
if ((incr > 0 && newsize < oldsize) || (incr < 0 && newsize > oldsize))
return( (char *) -1);
if (brk(newsize) == 0)
return(oldsize);
else
return( (char *) -1);
}