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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <dirent.h>
#include <dlfcn.h>
#include "list.h"
#include "mapcalc.h"
typedef char *(*func_t)(void);
static int register_function (char *fname, void *func, char *proto);
void init_plug (void);
static int
register_function (char *fname, void *func, char *proto)
{
STYP type;
SYMBOL *sym;
sym = getsym (fname);
if (sym)
symtab = (SYMBOL *)listdel ((LIST *)symtab, (LIST *)sym, freesym);
/*
* This is quite incomplete
*/
switch (proto[0])
{
case 'd':
type = st_nfunc;
break;
case 'm':
type = st_mfunc;
break;
case 'p':
type = st_pfunc;
break;
default:
return 0;
}
sym = putsym (fname);
sym->v.p = func;
sym->type = sym->itype = sym->rettype = type;
sym->proto = strdup (proto + 2); /* skip "m=" */
return 1;
}
void
init_plug (void)
{
SYMBOL *sym;
char path[4096], pathname[4096], *ptr, *fname, *proto;
struct dirent *ent;
void *handle, *func;
func_t fh, ph;
DIR *dir;
/*
* Search algorithm:
* 1. Find "pluginpath" in symbol table. If not found...
* 2. Find "$GISBASE/plugins". If not defined
* 3. Use "./plugins"
*/
sym = getsym ("pluginpath");
if (sym && sym->v.p)
strcpy (path, sym->v.p);
else
{
ptr = getenv ("GISBASE");
if (ptr)
strcpy (path, ptr);
else
strcpy (path, getcwd (path, 4096));
if (path[strlen (path) - 1] != '/')
strcat (path, "/");
strcat (path, "plugins");
}
dir = opendir (path);
if (!dir)
return;
while ((ent = readdir (dir)) != NULL)
{
if (!strcmp (ent->d_name, ".") || !strcmp (ent->d_name, ".."))
continue;
strcpy (pathname, path);
strcat (pathname, "/");
strcat (pathname, ent->d_name);
if (access (pathname, R_OK | X_OK))
continue;
handle = dlopen (pathname, RTLD_LAZY);
if (!handle)
continue;
fh = dlsym (handle, "fname");
if (dlerror ())
{
dlclose (handle);
continue;
}
fname = (*fh)();
if (!fname)
{
dlclose (handle);
continue;
}
ph = dlsym (handle, "proto");
if (dlerror ())
{
dlclose (handle);
continue;
}
proto = (*ph)();
if (!proto)
{
dlclose (handle);
continue;
}
func = dlsym (handle, fname);
if (!func)
{
dlclose (handle);
continue;
}
if (!register_function (fname, func, proto))
dlclose (handle);
}
closedir (dir);
}
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