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/* mod.c: loadable nawm modules */
/* Copyright (C) 1999 by the Massachusetts Institute of Technology.
*
* Permission to use, copy, modify, and distribute this
* software and its documentation for any purpose and without
* fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting
* documentation, and that the name of M.I.T. not be used in
* advertising or publicity pertaining to distribution of the
* software without specific, written prior permission.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is"
* without express or implied warranty.
*/
#include "nawm.h"
#include "lang.h"
#include "parser.h"
#include <dlfcn.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef NEED_UNDERSCORES
#define SYMNAME(x) ("_" x)
#else
#define SYMNAME
#endif
static char **nawm_libpath;
extern long eventmask;
extern event_handler *eventhandlers;
void initmodules(void)
{
char *libpath, *p;
int i;
libpath = getenv("NAWM_LIBRARY_PATH");
if (!libpath)
libpath = NAWM_DEFAULT_LIBPATH;
for (i = 0, p = libpath; *p; p++)
{
if (*p == ':')
i++;
}
nawm_libpath = xmalloc((i + 2) * sizeof(char *));
/* split libpath into components, recognizing an empty component
* as NAWM_DEFAULT_LIBPATH
*/
for (i = 0, p = libpath; *libpath; p++)
{
if (*p == ':' || *p == '\0')
{
if (p == libpath)
nawm_libpath[i] = NAWM_DEFAULT_LIBPATH;
else
{
int len = p - libpath;
while (libpath[len] == '/')
len--;
nawm_libpath[i] = xmalloc(len + 1);
memcpy(nawm_libpath[i], libpath, len);
nawm_libpath[i][len] = '\0';
}
libpath = *p ? p + 1 : p;
i++;
}
}
nawm_libpath[i] = NULL;
}
void load_module(char *name)
{
int i, len = strlen(name), *modrev, found = 0, opened = 0;
void *dlconfig = NULL;
void (*modinit)();
for (i = 0; nawm_libpath[i]; i++)
{
char *path = xmalloc(strlen(nawm_libpath[i]) + len + 5);
sprintf(path, "%s/%s.so", nawm_libpath[i], name);
if (!access(path, R_OK))
{
found = 1;
dlconfig = dlopen(path, RTLD_NOW);
free(path);
if (!dlconfig)
continue;
opened = 1;
modrev = dlsym(dlconfig, SYMNAME("nawm_modrev"));
if (!modrev || *modrev != 1)
continue;
modinit = dlsym(dlconfig, SYMNAME("modinit"));
if (!modinit)
continue;
modinit();
return;
}
}
if (opened)
{
if (modrev)
die("No symbol \"modinit\" in module \"%s\".", name);
else
die("No symbol \"nawm_modrev\" in module \"%s\".", name);
}
else if (found)
die("Couldn't open module \"%s\":\n%s", name, dlerror());
else
die("Couldn't find module \"%s\"", name);
}
void module_define_procedure(char *name, dtype rtype, void (*body)(),
int numargs, ...)
{
function *f;
va_list ap;
int i, nargs;
nargs = (numargs < 0) ? -numargs : numargs;
f = xmalloc(sizeof(function) + (nargs - 3) * sizeof(dtype));
f->body = body;
f->type = rtype;
f->numvars = -1;
f->numargs = numargs;
if (numargs < 0)
numargs = -numargs;
va_start(ap, numargs);
for (i = 0; i < numargs; i++)
f->vartype[i] = va_arg(ap, dtype);
va_end(ap);
define(rtype ? FUN : CMD, name, f);
}
void module_define_variable(char *name, dtype type, nawmval data)
{
variable *v = mkvar(type);
v->data = data;
define(VAR, name, v);
}
int module_define_type(char *name)
{
return newtype(name);
}
int module_lookup_type(char *name)
{
int kind;
int type = (nawmval)lookup(name, &kind, 0);
if (kind != DTYPE || type == 0)
return -1;
else
return type;
}
void module_define_event_handler(void (*handler)(XEvent *), long mask)
{
event_handler *h;
eventmask |= mask;
h = xmalloc(sizeof(event_handler));
h->handler = handler;
h->next = eventhandlers;
eventhandlers = h;
}
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