size_t __LastFree( void ) /* used by nheapgrow to know about adjustment */
{
frlptr p1;
unsigned brk_value;
if( __nheapbeg == NULL ) { /* no heap? can't have free blocks */
return( 0 );
}
p1 = __nheapbeg->freehead.prev; /* point to last free block */
brk_value = (unsigned)((PTR)p1 + p1->len + TAG_SIZE );
#if defined(__DOS_EXT__)
if( _IsPharLap() && !_IsFlashTek() )
_curbrk = SegmentLimit();
#endif
if( brk_value == _curbrk ) { /* if last free block is at the end */
return( p1->len );
}
return( 0 );
}
int __ExpandDGROUP( unsigned amount )
{
#if defined(__WINDOWS__) || defined(__WARP__) || defined(__NT__) \
|| defined(__CALL21__) || defined(__RDOS__)
// first try to free any available storage
_nheapshrink();
return( __CreateNewNHeap( amount ) );
#else
mheapptr p1;
frlptr flp;
unsigned brk_value;
tag *last_tag;
unsigned new_brk_value;
void _WCNEAR *brk_ret;
#if defined(__DOS_EXT__)
if( !__IsCtsNHeap() ) {
return( __CreateNewNHeap( amount ) ); // Won't slice either
}
// Rational non-zero based system should go through.
#endif
if( !__heap_enabled )
return( 0 );
if( _curbrk == ~1u )
return( 0 );
if( __AdjustAmount( &amount ) == 0 )
return( 0 );
#if defined(__DOS_EXT__)
if( _IsPharLap() && !_IsFlashTek() ) {
_curbrk = SegmentLimit();
}
#endif
new_brk_value = amount + _curbrk;
if( new_brk_value < _curbrk ) {
new_brk_value = ~1u;
}
brk_ret = __brk( new_brk_value );
if( brk_ret == (void _WCNEAR *)-1 ) {
return( 0 );
}
brk_value = (unsigned)brk_ret;
if( brk_value > /*0xfff8*/ ~7u ) {
return( 0 );
}
if( new_brk_value <= brk_value ) {
return( 0 );
}
amount = new_brk_value - brk_value;
if( amount - TAG_SIZE > amount ) {
return( 0 );
} else {
amount -= TAG_SIZE;
}
for( p1 = __nheapbeg; p1 != NULL; p1 = p1->next ) {
if( p1->next == NULL )
break;
if( (unsigned)p1 <= brk_value && ((unsigned)p1) + p1->len + TAG_SIZE >= brk_value ) {
break;
}
}
if( (p1 != NULL) && ((brk_value - TAG_SIZE) == (unsigned)( (PTR)p1 + p1->len) ) ) {
/* we are extending the previous heap block (slicing) */
/* nb. account for the end-of-heap tag */
brk_value -= TAG_SIZE;
amount += TAG_SIZE;
flp = (frlptr) brk_value;
/* adjust current entry in heap list */
p1->len += amount;
/* fix up end of heap links */
last_tag = (tag *) ( (PTR)flp + amount );
last_tag[0] = END_TAG;
} else {
if( amount < sizeof( miniheapblkp ) + sizeof( frl ) ) {
/* there isn't enough for a heap block (struct miniheapblkp) and
one free block (frl) */
return( 0 );
}
// Initializing the near heap if __nheapbeg == NULL,
// otherwise, a new mini-heap is getting linked up
p1 = (mheapptr)brk_value;
p1->len = amount;
flp = __LinkUpNewMHeap( p1 );
amount = flp->len;
}
/* build a block for _nfree() */
SET_MEMBLK_SIZE_USED( flp, amount );
++p1->numalloc; /* 28-dec-90 */
p1->largest_blk = ~0; /* set to largest value to be safe */
_nfree( (PTR)flp + TAG_SIZE );
return( 1 );
#endif
}
static int __F_NAME(__sopen,__wsopen)( const CHAR_TYPE *name, int mode,
int shflag, va_list args )
{
int rwmode;
int handle;
int attr;
int permission;
unsigned iomode_flags;
tiny_ret_t rc;
char dummy;
#ifdef __WIDECHAR__
char mbName[MB_CUR_MAX * _MAX_PATH]; /* single-byte char */
#endif
handle = -1;
rc = 0;
while( *name == STRING( ' ' ) )
++name;
#ifdef __WIDECHAR__
/*** If necessary, convert the wide filename to multibyte form ***/
if( wcstombs( mbName, name, sizeof( mbName ) ) == -1 ) {
mbName[0] = '\0';
}
#endif
rwmode = mode & ( O_RDONLY | O_WRONLY | O_RDWR | O_NOINHERIT );
if( _dos_open( __F_NAME(name,mbName), rwmode | shflag, &handle ) == 0 ) {
if( handle >= __NFiles ) {
TinyClose( handle );
__set_errno( EMFILE );
return( -1 );
}
}
/* 17-apr-90 05-sep-91 */
if( (mode & (O_RDONLY | O_WRONLY | O_RDWR)) != O_RDONLY ) {
if( handle != -1 ) {
if( ! isatty( handle ) ) { /* if not a device */
#if 0
rc = TinyAccess( name, 0 ); /* check for existence */
if( TINY_ERROR( rc ) ) { /* file does not exist */
TinyClose( handle ); /* close whatever file we got */
handle = -1;
} else if( mode & O_EXCL ) { /* must not exist */
#else
/*
Don't need to do the access check, since the file was opened
and therefore must exist (TinyOpen can't create a file).
We don't want to do the check because there are classes of items
in the file system namespace that are not devices, but the TinyAccess
will fail on (e.g. named pipes).
*/
/* must not exist if O_CREAT specified */
if( (mode & O_EXCL) && (mode & O_CREAT) ) {
#endif
TinyClose( handle );
__set_errno( EEXIST );
return( -1 );
} else if( mode & O_TRUNC ) { /* truncate file */
rc = TinyWrite( handle, &dummy, 0 );
if( TINY_ERROR( rc ) ) {
TinyClose( handle );
return( __set_errno_dos( TINY_INFO( rc ) ) );
}
}
}
}
}
if( handle == -1 ) { /* could not open */
if( (mode & O_CREAT) == 0 || _RWD_doserrno != E_nofile ) {
return( -1 );
}
/* creating the file */
permission = va_arg( args, int );
va_end( args );
if( permission == 0 )
permission = S_IWRITE | S_IREAD;
permission &= ~_RWD_umaskval; /* 05-jan-95 */
attr = 0;
if(( permission & S_IWRITE) == 0 )
attr = _A_RDONLY;
#if 0
/* remove this support because it is not consistently available */
if( _RWD_osmajor >= 5
#ifdef __DOS_EXT__
&& !_IsFlashTek()
&& !_IsRational()
#endif
) {
/* this function is only available in version DOS 5 and up */
/* this new way was added to handle the case of creating a */
/* new file with read-only access, but with a writeable */
/* file handle */
#ifdef __WIDECHAR__
rc = TinyCreateEx( mbName, rwmode|shflag, attr, TIO_OPEN );
#else
rc = TinyCreateEx( name, rwmode|shflag, attr, TIO_OPEN );
#endif
if( TINY_ERROR( rc ) ) {
return( __set_errno_dos( TINY_INFO( rc ) ) );
}
handle = TINY_INFO( rc );
} else
#endif
{
/* do it the old way */
if( _dos_creat( __F_NAME(name,mbName), attr, &handle ) ) {
return( -1 );
}
if( handle >= __NFiles ) {
TinyClose( handle );
__set_errno( EMFILE );
return( -1 );
}
/* 21-nov-90 AFS: the file is created so now the file must be */
/* opened with the correct share permissions */
if( shflag != 0 ) {
rc = TinyClose( handle );
if( TINY_ERROR( rc ) ) {
return( __set_errno_dos( TINY_INFO( rc ) ) );
}
if( _dos_open( __F_NAME(name,mbName), rwmode | shflag, &handle ) ) {
return( -1 );
}
/* handle does not equal -1 now */
}
}
}
iomode_flags = __GetIOMode( handle );
iomode_flags &= ~(_READ|_WRITE|_APPEND|_BINARY); /* 11-aug-88 */
if( isatty( handle ) ) iomode_flags |= _ISTTY;
rwmode &= ~O_NOINHERIT;
if( rwmode == O_RDWR ) iomode_flags |= _READ | _WRITE;
if( rwmode == O_RDONLY) iomode_flags |= _READ;
if( rwmode == O_WRONLY) iomode_flags |= _WRITE;
if( mode & O_APPEND ) iomode_flags |= _APPEND;
if( mode & (O_BINARY|O_TEXT) ) {
if( mode & O_BINARY ) iomode_flags |= _BINARY;
} else {
if( _RWD_fmode == O_BINARY ) iomode_flags |= _BINARY;
}
__SetIOMode( handle, iomode_flags );
#ifdef DEFAULT_WINDOWING
if( _WindowsNewWindow != 0 ) {
if( !__F_NAME(stricmp,wcscmp)( name, STRING( "con" ) ) ) {
_WindowsNewWindow( NULL, handle, -1 );
}
}
#endif
return( handle );
}
#if 0 /* couldn't find any user; please re-enable if it's necessary */
#ifndef __WIDECHAR__ /* compile one version only */
int __set_binary( int handle )
{
unsigned iomode_flags;
__ChkTTYIOMode( handle );
iomode_flags = __GetIOMode( handle );
iomode_flags |= _BINARY;
__SetIOMode( handle, iomode_flags );
if( iomode_flags & _ISTTY ) {
tiny_ret_t rc;
rc = TinyGetDeviceInfo( handle );
if( TINY_ERROR( rc ) ) {
return( __set_errno_dos( TINY_INFO( rc ) ) );
}
rc = TinySetDeviceInfo( handle, TINY_INFO(rc) | TIO_CTL_RAW );
if( TINY_ERROR( rc ) ) {
return( __set_errno_dos( TINY_INFO( rc ) ) );
}
}
return( 0 );
}
