89 lines
3.4 KiB
C
89 lines
3.4 KiB
C
/*
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* Copyright (C) 2015-2020 Jolla Ltd.
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* Copyright (C) 2015-2020 Slava Monich <slava.monich@jolla.com>
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*
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* You may use this file under the terms of the BSD license as follows:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <magic.h>
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#include <stdlib.h>
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#include <dlfcn.h>
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#include "HarbourSystem.h"
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#define MAGIC_FUNCTIONS(f) \
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f(void, magic_close, \
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(magic_t cookie), (cookie), (void)0) \
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f(int, magic_load, \
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(magic_t cookie, const char* path), (cookie, path), -1) \
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f(const char*, magic_file, \
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(magic_t cookie, const char* path), (cookie, path), NULL)
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#define MAGIC_NUM_FUNCTIONS (sizeof(magic_names)/sizeof(magic_names[0]))
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#define MAGIC_NO_HANDLE ((void*)-1)
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#define MAGIC_SO "libmagic.so.1"
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static const char* magic_names[] = {
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"magic_open",
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#define FN_NAME(type,name,params,args,fail) #name,
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MAGIC_FUNCTIONS(FN_NAME)
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};
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static struct {
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void* handle;
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union {
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struct magic_proc {
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magic_t (*magic_open)(int flags);
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#define FN_POINTER(type,name,params,args,fail) type (* name) params;
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MAGIC_FUNCTIONS(FN_POINTER)
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} magic;
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void* entry[MAGIC_NUM_FUNCTIONS];
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} fn;
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} magic;
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/* magic_open() is the special function where we load the library */
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magic_t magic_open(int flags)
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{
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if (!magic.handle) {
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magic.handle = HarbourDlopen(MAGIC_SO, RTLD_LAZY);
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if (magic.handle) {
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unsigned int i;
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for (i=0; i<MAGIC_NUM_FUNCTIONS; i++) {
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magic.fn.entry[i] = dlsym(magic.handle, magic_names[i]);
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}
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} else {
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magic.handle = MAGIC_NO_HANDLE;
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}
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}
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return magic.fn.magic.magic_open ? magic.fn.magic.magic_open(flags) : NULL;
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}
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/* All other wrappers are generated by the preprocessor */
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#define FN_IMPL(type,name,params,args,fail) type name params \
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{ return magic.fn.magic.name ? magic.fn.magic.name args : fail; }
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MAGIC_FUNCTIONS(FN_IMPL)
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