153 lines
3.3 KiB
C
153 lines
3.3 KiB
C
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/* dynload.c Dynamic Loader for TinyScheme */
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/* Original Copyright (c) 1999 Alexander Shendi */
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/* Modifications for NT and dl_* interface, scm_load_ext: D. Souflis */
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/* Refurbished by Stephen Gildea */
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#define _SCHEME_SOURCE
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#include "dynload.h"
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <glib/glib.h>
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#ifndef MAXPATHLEN
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# define MAXPATHLEN 1024
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#endif
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static void make_filename(const char *name, char *filename);
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static void make_init_fn(const char *name, char *init_fn);
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#ifdef _WIN32
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# include <windows.h>
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#else
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typedef void *HMODULE;
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typedef void (*FARPROC)();
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#ifndef SUN_DL
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#define SUN_DL
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#endif
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#include <dlfcn.h>
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#endif
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#ifdef _WIN32
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#define PREFIX ""
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#define SUFFIX ".dll"
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static void display_w32_error_msg(const char *additional_message)
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{
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LPVOID msg_buf;
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FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER,
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NULL, GetLastError(), 0,
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(LPTSTR)&msg_buf, 0, NULL);
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fprintf(stderr, "scheme load-extension: %s: %s", additional_message, msg_buf);
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LocalFree(msg_buf);
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}
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static HMODULE dl_attach(const char *module) {
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wchar_t *module_utf16 = g_utf8_to_utf16 (module, -1, NULL, NULL, NULL);
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HMODULE dll = NULL;
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if (!module_utf16)
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return NULL;
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dll = LoadLibraryW (module_utf16);
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if (!dll)
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display_w32_error_msg (module);
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free (module_utf16);
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return dll;
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}
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static FARPROC dl_proc(HMODULE mo, const char *proc) {
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FARPROC procedure = GetProcAddress(mo,proc);
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if (!procedure) display_w32_error_msg(proc);
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return procedure;
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}
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static void dl_detach(HMODULE mo) {
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(void)FreeLibrary(mo);
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}
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#elif defined(SUN_DL)
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#include <dlfcn.h>
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#define PREFIX "lib"
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#define SUFFIX ".so"
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static HMODULE dl_attach(const char *module) {
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HMODULE so=dlopen(module,RTLD_LAZY);
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if(!so) {
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fprintf(stderr, "Error loading scheme extension \"%s\": %s\n", module, dlerror());
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}
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return so;
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}
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static FARPROC dl_proc(HMODULE mo, const char *proc) {
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const char *errmsg;
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FARPROC fp=(FARPROC)dlsym(mo,proc);
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if ((errmsg = dlerror()) == 0) {
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return fp;
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}
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fprintf(stderr, "Error initializing scheme module \"%s\": %s\n", proc, errmsg);
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return 0;
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}
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static void dl_detach(HMODULE mo) {
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(void)dlclose(mo);
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}
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#endif
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pointer scm_load_ext(scheme *sc, pointer args)
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{
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pointer first_arg;
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pointer retval;
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char filename[MAXPATHLEN], init_fn[MAXPATHLEN+6];
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char *name;
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HMODULE dll_handle;
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void (*module_init)(scheme *sc);
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if ((args != sc->NIL) && is_string((first_arg = pair_car(args)))) {
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name = string_value(first_arg);
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make_filename(name,filename);
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make_init_fn(name,init_fn);
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dll_handle = dl_attach(filename);
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if (dll_handle == 0) {
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retval = sc -> F;
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}
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else {
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module_init = (void(*)(scheme *))dl_proc(dll_handle, init_fn);
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if (module_init != 0) {
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(*module_init)(sc);
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retval = sc -> T;
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}
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else {
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retval = sc->F;
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}
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}
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}
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else {
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retval = sc -> F;
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}
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return(retval);
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}
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static void make_filename(const char *name, char *filename) {
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strcpy(filename,name);
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strcat(filename,SUFFIX);
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}
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static void make_init_fn(const char *name, char *init_fn) {
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const char *p=strrchr(name,'/');
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if(p==0) {
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p=name;
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} else {
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p++;
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}
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strcpy(init_fn,"init_");
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strcat(init_fn,p);
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}
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