Working on the plugin interface
git-svn-id: svn://svn.cc65.org/cc65/trunk@1220 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
213
src/sim65/chip.c
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213
src/sim65/chip.c
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/*****************************************************************************/
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/* */
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/* chip.c */
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/* */
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/* Interface for the chip plugins */
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/* */
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/* */
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/* */
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/* (C) 2002 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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/* EMail: uz@musoftware.de */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#include <string.h>
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#include <dlfcn.h>
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/* common */
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#include "coll.h"
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#include "xmalloc.h"
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/* sim65 */
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#include "chippath.h"
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#include "error.h"
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#include "chip.h"
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Sorted list of all chip data structures */
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static Collection Chips = STATIC_COLLECTION_INITIALIZER;
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/*****************************************************************************/
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/* Helper functions */
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/*****************************************************************************/
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static int CmpChips (void* Data attribute ((unused)),
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const void* lhs, const void* rhs)
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/* Compare function for CollSort */
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{
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return strcmp (((const Chip*) lhs)->Name, ((const Chip*) rhs)->Name);
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}
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void* GetSym (const Chip* C, const char* SymName)
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/* Locate a symbol in a module and return it. Abort on errors (may be modified
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* later to return NULL).
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*/
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{
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void* Val;
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const char* Msg;
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/* Fetch the error message and discard it - this will clear pending
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* errors
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*/
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dlerror ();
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/* Fetch the symbol value */
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Val = dlsym (C->Handle, SymName);
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/* Check the error message */
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Msg = dlerror ();
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if (Msg) {
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/* We had an error */
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Error ("Error loading `%s' from `%s': %s", SymName, C->LibName, Msg);
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return 0;
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}
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/* Return the symbol value read */
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return Val;
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}
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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static Chip* NewChip (void* Handle, const char* LibName)
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/* Allocate a new chip structure, initialize and return it */
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{
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/* Allocate memory */
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Chip* C = xmalloc (sizeof (Chip));
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/* Initialize the fields */
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C->Name = 0;
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C->LibName = xstrdup (LibName);
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C->Handle = Handle;
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C->InitChip = 0;
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C->GetVersion = 0;
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C->WriteCtrl = 0;
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C->Write = 0;
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C->ReadCtrl = 0;
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C->Read = 0;
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/* Return the structure */
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return C;
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}
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void FreeChip (Chip* C)
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/* Free the given chip structure */
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{
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/* Free the strings */
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xfree (C->Name);
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xfree (C->LibName);
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/* Free the structure itself */
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xfree (C);
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}
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void LoadChip (const char* LibName)
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/* Load a chip. This includes loading the shared libary, allocating and
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* initializing the data structure.
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*/
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{
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Chip* C;
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void* H;
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const char* Msg;
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/* Locate the library */
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char* PathName = FindChip (LibName);
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if (PathName == 0) {
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/* Library not found */
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Error ("Cannot find chip plugin library `%s'", LibName);
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return;
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}
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/* Open the library */
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H = dlopen (PathName, RTLD_GLOBAL | RTLD_LAZY);
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/* Check for errors */
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Msg = dlerror ();
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if (Msg) {
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Error ("Error opening `%s': %s", PathName, Msg);
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}
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/* Free the path to the library since we don't need it any longer */
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xfree (PathName);
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/* Allocate the chip structure */
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C = NewChip (H, LibName);
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/* Read function pointers */
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C->InitChip = GetSym (C, "InitChip");
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C->GetName = GetSym (C, "GetName");
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C->GetVersion = GetSym (C, "GetVersion");
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C->WriteCtrl = GetSym (C, "WriteCtrl");
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C->Write = GetSym (C, "Write");
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C->ReadCtrl = GetSym (C, "ReadCtrl");
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C->Read = GetSym (C, "Read");
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/* Insert the structure into the list of all chips */
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CollAppend (&Chips, C);
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}
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void InitChips (void)
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/* Initialize the chips. Must be called *after* all chips are loaded */
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{
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/* Sort the chips by name */
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CollSort (&Chips, CmpChips, 0);
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}
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const Chip* GetChip (const char* Name)
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/* Find a chip by name. Returns the Chip data structure or NULL if the chip
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* could not be found.
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*/
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{
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return 0;
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}
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