162 lines
3.8 KiB
C
Executable File
162 lines
3.8 KiB
C
Executable File
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: load_dl.c *
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* comments: dl based dynamic loader of external routines *
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* tested on i486-linuxelf *
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*************************************************************************/
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#include "Yap.h"
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#include "Yatom.h"
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#include "YapHeap.h"
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#include "yapio.h"
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#include "Foreign.h"
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#if _WIN32
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#include <windows.h>
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/*
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* YAP_FindExecutable(argv[0]) should be called on yap initialization to
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* locate the executable of Yap
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*/
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char *
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Yap_FindExecutable(void)
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{
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enum { BUFFERSIZE = 1024 };
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char *buf = malloc(BUFFERSIZE);
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if (!GetModuleFileName(NULL, buf, BUFFERSIZE-1))
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return NULL;
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return buf;
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}
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void *
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Yap_LoadForeignFile(char *file, int flags)
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{
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char *buf = malloc(1024);
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void *ptr= (void *)LoadLibrary(file);
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if (!ptr) {
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FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL, GetLastError(),
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buf, 1023,
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NULL);
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}
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return ptr;
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}
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int
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Yap_CallForeignFile(void *handle, char *f)
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{
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YapInitProc proc = (YapInitProc)GetProcAddress((HMODULE)handle, f);
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if (!proc)
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return FALSE;
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(*proc)();
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return TRUE;
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}
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int
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Yap_CloseForeignFile(void *handle)
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{
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return FreeLibrary((HMODULE)handle);
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}
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/*
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* LoadForeign(ofiles,libs,proc_name,init_proc) dynamically loads foreign
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* code files and libraries and locates an initialization routine
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*/
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static Int
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LoadForeign(StringList ofiles, StringList libs,
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const char *proc_name, YapInitProc *init_proc)
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{
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CACHE_REGS
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while (ofiles) {
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HINSTANCE handle;
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if (*init_proc == NULL &&
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(*init_proc = (YapInitProc)GetProcAddress((HMODULE)handle, proc_name)))
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{
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YapInitProc f = *init_proc;
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f();
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return true;
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}
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const char *file = AtomName(ofiles->name);
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if (Yap_findFile(file, NULL, NULL, LOCAL_FileNameBuf, true, YAP_OBJ, true, true) &&
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(handle=LoadLibrary(LOCAL_FileNameBuf)) != 0)
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{
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LOCAL_ErrorMessage = NULL;
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if (*init_proc == NULL)
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*init_proc = (YapInitProc)GetProcAddress((HMODULE)handle, proc_name);
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} else {
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char *buf = malloc(1024);
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FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL, GetLastError(),
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), buf, 1023,
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NULL);
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//fprintf(stderr,"WinError: %s\n", LOCAL_ErrorSay);
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}
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ofiles = ofiles->next;
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}
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/* load libraries first so that their symbols are available to
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other routines */
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while (libs) {
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HINSTANCE handle;
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const char * s = AtomName(libs->name);
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if (s[0] == '-') {
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strcat(LOCAL_FileNameBuf,s+2);
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strcat(LOCAL_FileNameBuf,".dll");
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} else {
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strcpy(LOCAL_FileNameBuf,s);
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}
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if((handle=LoadLibrary(LOCAL_FileNameBuf)) == 0)
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{
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/* strcpy(LOCAL_ErrorSay,dlerror());*/
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return LOAD_FAILLED;
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}
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if (*init_proc == NULL)
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*init_proc = (YapInitProc)GetProcAddress((HMODULE)handle, proc_name);
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libs = libs->next;
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}
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if(*init_proc == NULL) {
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LOCAL_ErrorMessage = "Could not locate initialization routine";
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return LOAD_FAILLED;
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}
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return LOAD_SUCCEEDED;
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}
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Int
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Yap_LoadForeign(StringList ofiles, StringList libs,
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char *proc_name, YapInitProc *init_proc)
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{
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return LoadForeign(ofiles, libs, proc_name, init_proc);
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}
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void
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Yap_ShutdownLoadForeign(void)
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{
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}
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Int
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Yap_ReLoadForeign(StringList ofiles, StringList libs,
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char *proc_name, YapInitProc *init_proc)
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{
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return(LoadForeign(ofiles,libs, proc_name, init_proc));
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}
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#endif
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