factor/basis/libc/libc.factor

102 lines
2.4 KiB
Factor

! Copyright (C) 2004, 2005 Mackenzie Straight
! Copyright (C) 2007, 2009 Slava Pestov
! Copyright (C) 2007, 2008 Doug Coleman
! See http://factorcode.org/license.txt for BSD license.
USING: alien alien.c-types assocs continuations alien.destructors kernel
namespaces accessors sets summary destructors destructors.private ;
IN: libc
: errno ( -- int )
int "factor" "err_no" { } alien-invoke ;
: set-errno ( int -- )
void "factor" "set_err_no" { int } alien-invoke ;
: clear-errno ( -- )
0 set-errno ;
: preserve-errno ( quot -- )
errno [ call ] dip set-errno ; inline
<PRIVATE
: (malloc) ( size -- alien )
void* "libc" "malloc" { ulong } alien-invoke ;
: (calloc) ( count size -- alien )
void* "libc" "calloc" { ulong ulong } alien-invoke ;
: (free) ( alien -- )
void "libc" "free" { void* } alien-invoke ;
: (realloc) ( alien size -- newalien )
void* "libc" "realloc" { void* ulong } alien-invoke ;
! We stick malloc-ptr instances in the global disposables set
TUPLE: malloc-ptr value continuation ;
M: malloc-ptr hashcode* value>> hashcode* ;
M: malloc-ptr equal?
over malloc-ptr? [ [ value>> ] bi@ = ] [ 2drop f ] if ;
: <malloc-ptr> ( value -- malloc-ptr )
malloc-ptr new swap >>value ;
PRIVATE>
ERROR: bad-ptr ;
M: bad-ptr summary
drop "Memory allocation failed" ;
: check-ptr ( c-ptr -- c-ptr )
[ bad-ptr ] unless* ;
ERROR: realloc-error ptr size ;
M: realloc-error summary
drop "Memory reallocation failed" ;
<PRIVATE
: add-malloc ( alien -- alien )
dup <malloc-ptr> register-disposable ;
: delete-malloc ( alien -- )
[ <malloc-ptr> unregister-disposable ] when* ;
: malloc-exists? ( alien -- ? )
<malloc-ptr> disposables get key? ;
PRIVATE>
: malloc ( size -- alien )
(malloc) check-ptr add-malloc ;
: calloc ( count size -- alien )
(calloc) check-ptr add-malloc ;
: realloc ( alien size -- newalien )
[ >c-ptr ] dip
over malloc-exists? [ realloc-error ] unless
[ drop ] [ (realloc) check-ptr ] 2bi
[ delete-malloc ] [ add-malloc ] bi* ;
: free ( alien -- )
>c-ptr [ delete-malloc ] [ (free) ] bi ;
: memcpy ( dst src size -- )
void "libc" "memcpy" { void* void* ulong } alien-invoke ;
: memcmp ( a b size -- cmp )
int "libc" "memcmp" { void* void* ulong } alien-invoke ;
: memory= ( a b size -- ? )
memcmp 0 = ;
: strlen ( alien -- len )
size_t "libc" "strlen" { c-string } alien-invoke ;
DESTRUCTOR: free