harbour-books/app/stubs/libmagic.c

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