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yap-6.3/C/load_dll.c

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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: load_dl.c *
* comments: dl based dynamic loader of external routines *
* tested on i486-linuxelf *
*************************************************************************/
#include "Yap.h"
#include "Yatom.h"
#include "YapHeap.h"
#include "yapio.h"
#include "Foreign.h"
#if LOAD_DLL
#include <windows.h>
/*
* YAP_FindExecutable(argv[0]) should be called on yap initialization to
* locate the executable of Yap
*/
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char *
Yap_FindExecutable(void)
{
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return "yap";
}
void *
Yap_LoadForeignFile(char *file, int flags)
{
return (void *)LoadLibrary(file);
}
int
Yap_CallForeignFile(void *handle, char *f)
{
YapInitProc proc = (YapInitProc)GetProcAddress((HMODULE)handle, f);
if (!proc)
return FALSE;
(*proc)();
return TRUE;
}
int
Yap_CloseForeignFile(void *handle)
{
return FreeLibrary((HMODULE)handle);
}
/*
* LoadForeign(ofiles,libs,proc_name,init_proc) dynamically loads foreign
* code files and libraries and locates an initialization routine
*/
static Int
LoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
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CACHE_REGS
while (ofiles) {
HINSTANCE handle;
if (Yap_TrueFileName(AtomName(ofiles->name), LOCAL_FileNameBuf, TRUE) &&
(handle=LoadLibrary(LOCAL_FileNameBuf)) != 0)
{
LOCAL_ErrorSay[0]=~'\0';
if (*init_proc == NULL)
*init_proc = (YapInitProc)GetProcAddress((HMODULE)handle, proc_name);
} else {
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), LOCAL_ErrorSay, 256,
NULL);
}
ofiles = ofiles->next;
}
/* load libraries first so that their symbols are available to
other routines */
while (libs) {
HINSTANCE handle;
char * s = AtomName(libs->name);
if (s[0] == '-') {
strcat(LOCAL_FileNameBuf,s+2);
strcat(LOCAL_FileNameBuf,".dll");
} else {
strcpy(LOCAL_FileNameBuf,s);
}
if((handle=LoadLibrary(LOCAL_FileNameBuf)) == 0)
{
/* strcpy(LOCAL_ErrorSay,dlerror());*/
return LOAD_FAILLED;
}
if (*init_proc == NULL)
*init_proc = (YapInitProc)GetProcAddress((HMODULE)handle, proc_name);
libs = libs->next;
}
if(*init_proc == NULL) {
strcpy(LOCAL_ErrorSay,"Could not locate initialization routine");
return LOAD_FAILLED;
}
return LOAD_SUCCEEDED;
}
Int
Yap_LoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
return LoadForeign(ofiles, libs, proc_name, init_proc);
}
void
Yap_ShutdownLoadForeign(void)
{
}
Int
Yap_ReLoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
return(LoadForeign(ofiles,libs, proc_name, init_proc));
}
#endif