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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1997-2011 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* Glenn Fowler
* AT&T Research
*/
#include "dlllib.h"
typedef void* (*Dll_lib_f)(const char*, void*, const char*);
typedef struct Dll_lib_s
{
struct Dll_lib_s* next;
Dll_lib_f libf;
char* path;
char base[1];
} Dll_lib_t;
/*
* split <name,base,type,opts> from name into names
*/
Dllnames_t*
dllnames(const char* id, const char* name, Dllnames_t* names)
{
char* s;
char* t;
char* b;
char* e;
size_t n;
n = strlen(id);
if (strneq(name, id, n) && (streq(name + n, "_s") || streq(name + n, "_t")))
return 0;
if (!names)
{
s = fmtbuf(sizeof(Dllnames_t*) + sizeof(names) - 1);
if (n = (s - (char*)0) % sizeof(names))
s += sizeof(names) - n;
names = (Dllnames_t*)s;
}
/*
* determine the base name
*/
if ((s = strrchr(name, '/')) || (s = strrchr(name, '\\')))
s++;
else
s = (char*)name;
if (strneq(s, "lib", 3))
s += 3;
b = names->base = names->data;
e = b + sizeof(names->data) - 1;
t = s;
while (b < e && *t && *t != '.' && *t != '-' && *t != ':')
*b++ = *t++;
*b++ = 0;
/*
* determine the optional type
*/
if (t = strrchr(s, ':'))
{
names->name = b;
while (b < e && s < t)
*b++ = *s++;
*b++ = 0;
names->type = b;
while (b < e && *++t)
*b++ = *t;
*b++ = 0;
}
else
{
names->name = (char*)name;
names->type = 0;
}
*(names->path = b) = 0;
names->opts = 0;
names->id = (char*)id;
return names;
}
/*
* return method pointer for <id,version> in names
*/
void*
dll_lib(Dllnames_t* names, unsigned long version, Dllerror_f errorf, void* disc)
{
void* dll;
Dll_lib_t* lib;
Dll_lib_f libf;
int n;
char sym[64];
static Dll_lib_t* loaded;
if (!names)
return 0;
/*
* check if plugin already loaded
*/
for (lib = loaded; lib; lib = lib->next)
if (streq(names->base, lib->base))
{
libf = lib->libf;
goto init;
}
/*
* load
*/
if (!(dll = dllplugin(names->id, names->name, NiL, version, NiL, RTLD_LAZY, names->path, names->data + sizeof(names->data) - names->path)) && (streq(names->name, names->base) || !(dll = dllplugin(names->id, names->base, NiL, version, NiL, RTLD_LAZY, names->path, names->data + sizeof(names->data) - names->path))))
{
if (errorf)
(*errorf)(NiL, disc, 2, "%s: library not found", names->name);
return 0;
}
/*
* init
*/
sfsprintf(sym, sizeof(sym), "%s_lib", names->id);
if (!(libf = (Dll_lib_f)dlllook(dll, sym)))
{
if (errorf)
(*errorf)(NiL, disc, 2, "%s: %s: initialization function not found in library", names->path, sym);
return 0;
}
/*
* add to the loaded list
*/
if (lib = newof(0, Dll_lib_t, 1, (n = strlen(names->base)) + strlen(names->path) + 1))
{
lib->libf = libf;
strcpy(lib->base, names->base);
strcpy(lib->path = lib->base + n + 1, names->path);
lib->next = loaded;
loaded = lib;
}
init:
return (*libf)(names->path, disc, names->type);
}
/*
* return method pointer for <id,name,version>
*/
void*
dllmeth(const char* id, const char* name, unsigned long version)
{
Dllnames_t names;
return dll_lib(dllnames(id, name, &names), version, 0, 0);
}
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