- ensure es = ds = ss upon exit of each C runtime function
- clear upper 16 bits of ebx before setting them to 0x0021,
when invoking interrupt_ptr to simulate a RM int 0x21
- make _sys_exists use the transfer buffer (which it needs)
- make _sys_rawread properly handle an end-of-file read
(zero bytes read)
- make argument to _sys_seterrno short --- after a failed
int 0x21 call, only the lower 16 bits of eax hold the MS-DOs
error code
- _sys_rawlseek accepts only 3 longword arguments, not 4
(the offset is only 1 longword)
- other minor fixes
- correctly calculate size of BSS area to clear
- make realloc routine set both ds & es to point to new
data segment
- correctly initialize real mode flags when simulating real
mode interrupt via DPMI
- other minor fixes
- do not try to store data through code segment selectors
- set each segment limit to segment size - 1, not segment size
- get PSP segment while still in real/V86 mode (DPMI host
might choose to return PM selector for int 0x21, ah = 0x62)
- other minor fixes
