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https://github.com/adtools/clib2.git
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742 lines
17 KiB
C
742 lines
17 KiB
C
/*
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* $Id: amiga_rexxvars.c,v 1.19 2008-04-18 10:11:59 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* We don't want to pull in <clib/alib_protos.h> */
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#define CLIB_ALIB_PROTOS_H
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/****************************************************************************/
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#ifndef _STDLIB_HEADERS_H
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#include "stdlib_headers.h"
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#endif /* _STDLIB_HEADERS_H */
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/****************************************************************************/
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#ifndef _STDLIB_CONSTRUCTOR_H
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#include "stdlib_constructor.h"
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#endif /* _STDLIB_CONSTRUCTOR_H */
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/****************************************************************************/
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#include <rexx/rxslib.h>
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#include <rexx/errors.h>
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/****************************************************************************/
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/* This is used by the stub function prototypes. The ARexx header files
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do not define it, though. */
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struct Environment;
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/****************************************************************************/
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#define __NOLIBBASE__
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#include <proto/rexxsyslib.h>
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/****************************************************************************/
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static struct Library * RexxSysBase;
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/****************************************************************************/
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#if defined(__amigaos4__)
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static struct RexxSysIFace * IRexxSys;
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#endif /* __amigaos4__ */
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/****************************************************************************/
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BOOL CheckRexxMsg(struct RexxMsg *message);
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LONG GetRexxVar(struct RexxMsg *message,STRPTR variable_name,STRPTR *buffer_pointer);
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LONG SetRexxVar(struct RexxMsg *message,STRPTR variable_name,STRPTR value,LONG length);
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/****************************************************************************/
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CLIB_CONSTRUCTOR(rexxvars_init)
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{
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ENTER();
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RexxSysBase = OpenLibrary(RXSNAME,0);
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#if defined(__amigaos4__)
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{
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if(RexxSysBase != NULL)
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{
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IRexxSys = (struct RexxSysIFace *)GetInterface(RexxSysBase, "main", 1, 0);
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if(IRexxSys == NULL)
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{
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CloseLibrary(RexxSysBase);
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RexxSysBase = NULL;
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}
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}
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}
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#endif /* __amigaos4__ */
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LEAVE();
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CONSTRUCTOR_SUCCEED();
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}
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/****************************************************************************/
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CLIB_DESTRUCTOR(rexxvars_exit)
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{
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ENTER();
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#if defined(__amigaos4__)
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{
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if(IRexxSys != NULL)
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DropInterface((struct Interface *)IRexxSys);
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IRexxSys = NULL;
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}
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#endif /* __amigaos4__ */
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if(RexxSysBase != NULL)
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{
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CloseLibrary(RexxSysBase);
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RexxSysBase = NULL;
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}
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LEAVE();
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}
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/****************************************************************************/
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/* This is modeled after the original assembly language code. Except for the
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fact that we compare the library base against a local, static variable
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rather then opening the library for each check. */
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BOOL
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CheckRexxMsg(struct RexxMsg *message)
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{
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BOOL result = FALSE;
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if(RexxSysBase == NULL)
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goto out;
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if(message->rm_LibBase != RexxSysBase)
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goto out;
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if(message->rm_TaskBlock == NULL)
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goto out;
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if(NOT IsRexxMsg(message))
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goto out;
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result = TRUE;
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out:
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return(result);
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}
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/****************************************************************************/
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#if defined(__amigaos4__)
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/****************************************************************************/
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#include <exec/emulation.h>
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/****************************************************************************/
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STATIC VOID
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_FreeSpace(struct Environment * env,APTR mem,LONG size)
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{
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STATIC CONST UWORD code[] = { 0x4EAE,0xFF88,0x4E75 }; /* jsr -120(a6) ; rts */
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EmulateTags(code,
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ET_RegisterA0,env,
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ET_RegisterA1,mem,
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ET_RegisterD0,size,
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ET_RegisterA6,RexxSysBase,
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TAG_END);
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}
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STATIC APTR
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_GetSpace(struct Environment * env,LONG size)
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{
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STATIC CONST UWORD code[] = { 0x4EAE,0xFF8E,0x4E75 }; /* jsr -114(a6) ; rts */
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APTR result;
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result = (APTR)EmulateTags(code,
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ET_RegisterA0,env,
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ET_RegisterD0,size,
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ET_RegisterA6,RexxSysBase,
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TAG_END);
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return(result);
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}
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STATIC LONG
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_IsSymbol(STRPTR name,LONG * symbol_length_ptr)
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{
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STATIC CONST UWORD code[] = { 0x4EAE,0xFF9A,0x2481,0x4E75 }; /* jsr -102(a6) ; move.l d1,(a2) ; rts */
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LONG result;
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result = (LONG)EmulateTags(code,
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ET_RegisterA0,name,
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ET_RegisterA2,symbol_length_ptr,
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ET_RegisterA6,RexxSysBase,
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TAG_END);
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return(result);
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}
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STATIC VOID
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_CurrentEnv(struct RexxTask *task,struct Environment ** environment_ptr)
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{
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STATIC CONST UWORD code[] = { 0x4EAE,0xFF94,0x2488,0x4E75 }; /* jsr -108(a6) ; move.l a0,(a2) ; rts */
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EmulateTags(code,
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ET_RegisterA0,task,
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ET_RegisterA2,environment_ptr,
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ET_RegisterA6,RexxSysBase,
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TAG_END);
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}
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STATIC struct Node *
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_FetchValue(struct Environment * env,struct NexxStr * stem,struct NexxStr * compound,struct Node *symbol_table_node,LONG * is_literal_ptr,struct NexxStr ** value_ptr)
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{
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STATIC CONST UWORD code[] = { 0x4EAE,0xFFB8,0x2488,0x2681,0x4E75 }; /* jsr -72(a6) ; move.l a0,(a2) ; move.l d1,(a3) ; rts */
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struct Node * result;
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result = (struct Node *)EmulateTags(code,
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ET_RegisterA0,env,
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ET_RegisterA1,stem,
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ET_RegisterD0,compound,
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ET_RegisterD1,symbol_table_node,
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ET_RegisterA2,is_literal_ptr,
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ET_RegisterA3,value_ptr,
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ET_RegisterA6,RexxSysBase,
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TAG_END);
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return(result);
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}
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STATIC struct Node *
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_EnterSymbol(struct Environment * env,struct NexxStr * stem,struct NexxStr * compound)
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{
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STATIC CONST UWORD code[] = { 0x4EAE,0xFFBE,0x4E75 }; /* jsr -66(a6) ; rts */
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struct Node * result;
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result = (struct Node *)EmulateTags(code,
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ET_RegisterA0,env,
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ET_RegisterA1,stem,
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ET_RegisterD0,compound,
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ET_RegisterA6,RexxSysBase,
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TAG_END);
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return(result);
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}
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STATIC VOID
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_SetValue(struct Environment * env,struct NexxStr * value,struct Node * symbol_table_node)
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{
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STATIC CONST UWORD code[] = { 0x4EAE,0xFFAC,0x4E75 }; /* jsr -84(a6) ; rts */
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EmulateTags(code,
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ET_RegisterA0,env,
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ET_RegisterA1,value,
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ET_RegisterD0,symbol_table_node,
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ET_RegisterA6,RexxSysBase,
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TAG_END);
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}
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STATIC ULONG
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_StrcpyN(STRPTR destination,STRPTR source,LONG length)
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{
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STATIC CONST UWORD code[] = { 0x4EAE,0xFEF2,0x4E75 }; /* jsr -270(a6) ; rts */
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ULONG result;
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result = (ULONG)EmulateTags(code,
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ET_RegisterA0,destination,
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ET_RegisterA1,source,
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ET_RegisterD0,length,
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ET_RegisterA6,RexxSysBase,
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TAG_END);
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return(result);
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}
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/****************************************************************************/
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#elif defined(__GNUC__) && !defined(__amigaos4__)
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/****************************************************************************/
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/* A selection of lovingly hand-crafted 68k stub functions which call
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into rexxsyslib.library LVOs that still used to be documented back
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in 1987. */
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/****************************************************************************/
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#if defined(SMALL_DATA)
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#define A4(x) "a4@(" #x ":W)"
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#elif defined(SMALL_DATA32)
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#define A4(x) "a4@(" #x ":L)"
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#else
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#define A4(x) #x
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#endif /* SMALL_DATA */
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/****************************************************************************/
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/* struct Environment * a0,APTR block a1,LONG d0 */
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asm("
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.text
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.even
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.globl __FreeSpace
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__FreeSpace:
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moveal sp@(4),a0
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moveal sp@(8),a1
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movel sp@(12),d0
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movel a6,sp@-
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moveal "A4(_RexxSysBase)",a6
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jsr a6@(-120)
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moveal sp@+,a6
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rts
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");
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/****************************************************************************/
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/* struct Environment * a0,LONG d0 : APTR d0 */
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asm("
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.text
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.even
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.globl __GetSpace
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__GetSpace:
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moveal sp@(4),a0
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movel sp@(8),d0
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movel a6,sp@-
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moveal "A4(_RexxSysBase)",a6
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jsr a6@(-114)
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moveal sp@+,a6
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rts
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");
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/****************************************************************************/
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/* STRPTR a0 : LONG d0, LONG d1 */
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asm("
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.text
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.even
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.globl __IsSymbol
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__IsSymbol:
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moveal sp@(4),a0
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movel a6,sp@-
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moveal "A4(_RexxSysBase)",a6
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jsr a6@(-102)
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moveal sp@+,a6
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moveal sp@(8),a1
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movel d1,a1@
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rts
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");
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/****************************************************************************/
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/* struct RexxTask * a0 : struct Environment * a0 */
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asm("
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.text
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.even
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|
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.globl __CurrentEnv
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__CurrentEnv:
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|
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moveal sp@(4),a0
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|
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movel a6,sp@-
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moveal "A4(_RexxSysBase)",a6
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jsr a6@(-108)
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moveal sp@+,a6
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|
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moveal sp@(8),a1
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movel a0,a1@
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|
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rts
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|
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");
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/****************************************************************************/
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|
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/* struct Environment * a0,struct NexxStr * a1,struct NexxStr * d0,struct Node * d1 : struct NexxStr * a0, LONG d1 */
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asm("
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|
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|
.text
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.even
|
|
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.globl __FetchValue
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__FetchValue:
|
|
|
|
moveal sp@(4),a0
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moveal sp@(8),a1
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movel sp@(12),d0
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movel sp@(16),d1
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|
|
|
movel a6,sp@-
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moveal "A4(_RexxSysBase)",a6
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jsr a6@(-72)
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moveal sp@+,a6
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|
|
|
moveal sp@(20),a1
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movel a0,a1@
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moveal sp@(24),a1
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movel d1,a1@
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|
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|
rts
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|
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|
");
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/****************************************************************************/
|
|
|
|
/* struct Environment a0, struct NexxStr *a1, struct NexxStr * d0 : struct Node * d0 */
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asm("
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|
|
|
.text
|
|
.even
|
|
|
|
.globl __EnterSymbol
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|
|
|
__EnterSymbol:
|
|
|
|
moveal sp@(4),a0
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moveal sp@(8),a1
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movel sp@(12),d0
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|
|
|
movel a6,sp@-
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moveal "A4(_RexxSysBase)",a6
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jsr a6@(-66)
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moveal sp@+,a6
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|
|
|
rts
|
|
|
|
");
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|
|
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/****************************************************************************/
|
|
|
|
/* struct Environment *a0, struct NexxStr *a1, struct Node * d0 */
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asm("
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|
|
|
.text
|
|
.even
|
|
|
|
.globl __SetValue
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|
|
|
__SetValue:
|
|
|
|
moveal sp@(4),a0
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|
moveal sp@(8),a1
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|
movel sp@(12),d0
|
|
|
|
movel a6,sp@-
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|
moveal "A4(_RexxSysBase)",a6
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|
jsr a6@(-84)
|
|
moveal sp@+,a6
|
|
|
|
rts
|
|
|
|
");
|
|
|
|
/****************************************************************************/
|
|
|
|
/* STRPTR a0,STRPTR a1,LONG d0 : ULONG d0 */
|
|
asm("
|
|
|
|
.text
|
|
.even
|
|
|
|
.globl __StrcpyN
|
|
|
|
__StrcpyN:
|
|
|
|
moveal sp@(4),a0
|
|
moveal sp@(8),a1
|
|
movel sp@(12),d0
|
|
|
|
movel a6,sp@-
|
|
moveal "A4(_RexxSysBase)",a6
|
|
jsr a6@(-270)
|
|
moveal sp@+,a6
|
|
|
|
rts
|
|
|
|
");
|
|
|
|
/****************************************************************************/
|
|
|
|
/* Function prototypes for the 68k stubs. */
|
|
extern VOID _FreeSpace(struct Environment * env,APTR mem,LONG size);
|
|
extern APTR _GetSpace(struct Environment * env,LONG size);
|
|
extern LONG _IsSymbol(STRPTR name,LONG * symbol_length_ptr);
|
|
extern VOID _CurrentEnv(struct RexxTask *task,struct Environment ** environment_ptr);
|
|
extern struct Node * _FetchValue(struct Environment * env,struct NexxStr * stem,struct NexxStr * compound,struct Node *symbol_table_node,LONG * is_literal_ptr,struct NexxStr ** value_ptr);
|
|
extern struct Node * _EnterSymbol(struct Environment * env,struct NexxStr * stem,struct NexxStr * compound);
|
|
extern VOID _SetValue(struct Environment * env,struct NexxStr * value,struct Node * symbol_table_node);
|
|
extern ULONG _StrcpyN(STRPTR destination,STRPTR source,LONG length);
|
|
|
|
/****************************************************************************/
|
|
|
|
#endif /* __GNUC__ && !__amigaos4__ */
|
|
|
|
/****************************************************************************/
|
|
|
|
/* Releases a string structure, if it's not owned at the time. */
|
|
STATIC VOID
|
|
FreeString(struct Environment * environment,struct NexxStr * ns)
|
|
{
|
|
/* Not currently owned? */
|
|
if(!(ns->ns_Flags & NSF_KEEP))
|
|
_FreeSpace(environment,ns,sizeof(*ns) + ns->ns_Length + 1);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
/* Allocates and initializes a string structure. */
|
|
STATIC struct NexxStr *
|
|
MakeString(struct Environment * environment,STRPTR value,LONG length)
|
|
{
|
|
struct NexxStr * result = NULL;
|
|
struct NexxStr * ns;
|
|
|
|
/* Allocate memory for the NexxStr and the NUL-terminated string itself. */
|
|
ns = _GetSpace(environment,sizeof(*ns) + length + 1);
|
|
if(ns == NULL)
|
|
goto out;
|
|
|
|
/* Fill in the NexxStr structure, copy the string and remember the hash value for it. */
|
|
ns->ns_Ivalue = 0;
|
|
ns->ns_Length = length;
|
|
ns->ns_Flags = NSF_STRING;
|
|
ns->ns_Hash = _StrcpyN((STRPTR)ns->ns_Buff,value,length);
|
|
|
|
/* Copying the string did not NUL-terminate it. */
|
|
ns->ns_Buff[length] = '\0';
|
|
|
|
result = ns;
|
|
|
|
out:
|
|
|
|
return(result);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
/* Classifies a symbol and returns the stem and compound parts. */
|
|
STATIC LONG
|
|
TypeString(STRPTR variable_name,struct Environment * environment,struct NexxStr ** compound_ptr,struct NexxStr ** stem_ptr)
|
|
{
|
|
struct NexxStr * compound;
|
|
struct NexxStr * stem = NULL;
|
|
LONG error = ERR10_003; /* no memory available */
|
|
LONG stem_length;
|
|
LONG symbol_length;
|
|
STRPTR dot;
|
|
|
|
(*compound_ptr) = NULL;
|
|
(*stem_ptr) = NULL;
|
|
|
|
/* The 'compound' part is the entire variable name, including all dots and
|
|
what's in between them. */
|
|
compound = MakeString(environment,variable_name,strlen(variable_name));
|
|
if(compound == NULL)
|
|
goto out;
|
|
|
|
/* Find the first dot in the variable name. Everything in front of it
|
|
and including the dot constitutes the 'stem' part. If there is no dot
|
|
in the name, then the 'compound' and 'stem' parts are identical. */
|
|
dot = memchr(compound->ns_Buff,'.',compound->ns_Length);
|
|
if(dot != NULL)
|
|
stem_length = ((char *)dot - (char *)compound->ns_Buff) + 1;
|
|
else
|
|
stem_length = compound->ns_Length;
|
|
|
|
/* Make a copy of the 'stem' part. */
|
|
stem = MakeString(environment,variable_name,stem_length);
|
|
if(stem == NULL)
|
|
goto out;
|
|
|
|
/* Figure out if this is a symbol after all. */
|
|
_IsSymbol((STRPTR)stem->ns_Buff,&symbol_length);
|
|
|
|
/* The entire name must match the stem part. */
|
|
if(symbol_length != stem->ns_Length)
|
|
{
|
|
error = ERR10_040; /* invalid variable name */
|
|
goto out;
|
|
}
|
|
|
|
(*compound_ptr) = compound;
|
|
(*stem_ptr) = stem;
|
|
|
|
error = 0;
|
|
|
|
out:
|
|
|
|
if(error != 0)
|
|
{
|
|
if(compound != NULL)
|
|
FreeString(environment,compound);
|
|
|
|
if(stem != NULL)
|
|
FreeString(environment,stem);
|
|
}
|
|
|
|
return(error);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
/* Retrieves the value of a variable from the current storage environment. */
|
|
LONG
|
|
GetRexxVar(struct RexxMsg *context,STRPTR variable_name,STRPTR * return_value)
|
|
{
|
|
struct Environment * environment;
|
|
struct NexxStr * ns;
|
|
struct NexxStr * compound_string;
|
|
struct NexxStr * stem_string;
|
|
LONG is_literal;
|
|
LONG error;
|
|
|
|
(*return_value) = NULL;
|
|
|
|
if(!CheckRexxMsg(context))
|
|
{
|
|
error = ERR10_010; /* invalid message packet */
|
|
goto out;
|
|
}
|
|
|
|
/* Find the current storage environment. */
|
|
_CurrentEnv(context->rm_TaskBlock,&environment);
|
|
|
|
/* Create the stem and component parts. */
|
|
error = TypeString(variable_name,environment,&compound_string,&stem_string);
|
|
if(error != 0)
|
|
goto out;
|
|
|
|
/* Look up the value. NOTE: _FetchValue() will free the two 'struct NexxStr *' provided. */
|
|
_FetchValue(environment,stem_string,compound_string,NULL,&is_literal,&ns);
|
|
|
|
/* If this is not a literal, return a pointer to the string. */
|
|
if(!is_literal)
|
|
(*return_value) = (STRPTR)ns->ns_Buff;
|
|
|
|
error = 0;
|
|
|
|
out:
|
|
|
|
return(error);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
/* Assigns a value to a variable in the current storage environment. */
|
|
LONG
|
|
SetRexxVar(struct RexxMsg *context,STRPTR variable_name,STRPTR value,LONG length)
|
|
{
|
|
struct Environment * environment;
|
|
struct NexxStr * compound_string;
|
|
struct NexxStr * stem_string;
|
|
struct Node * symbol_table_node;
|
|
struct NexxStr *value_string;
|
|
LONG error;
|
|
|
|
/* Make sure the value string is not too long */
|
|
if(length > 65535)
|
|
{
|
|
error = ERR10_009; /* symbol or string too long */
|
|
goto out;
|
|
}
|
|
|
|
if(!CheckRexxMsg(context))
|
|
{
|
|
error = ERR10_010; /* invalid message packet */
|
|
goto out;
|
|
}
|
|
|
|
/* Find the current storage environment. */
|
|
_CurrentEnv(context->rm_TaskBlock,&environment);
|
|
|
|
/* Create the stem and compound parts */
|
|
error = TypeString(variable_name,environment,&compound_string,&stem_string);
|
|
if(error != 0)
|
|
goto out;
|
|
|
|
/* Locate or create the symbol node. NOTE: _EnterSymbol() will put the two 'struct NexxStr *' into
|
|
the symbol table. It is not nececessary to free them. */
|
|
symbol_table_node = _EnterSymbol(environment,stem_string,compound_string);
|
|
if(symbol_table_node == NULL)
|
|
{
|
|
error = ERR10_003; /* no memory available */
|
|
goto out;
|
|
}
|
|
|
|
/* Create the value string. */
|
|
value_string = MakeString(environment,value,length);
|
|
if(value_string == NULL)
|
|
{
|
|
error = ERR10_003; /* no memory available */
|
|
goto out;
|
|
}
|
|
|
|
/* Install the value string. */
|
|
_SetValue(environment,value_string,symbol_table_node);
|
|
|
|
error = 0;
|
|
|
|
out:
|
|
|
|
return(error);
|
|
}
|