harbour-books/app/stubs/libexpat.c

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/*
* Copyright (C) 2015 Jolla Ltd.
* Contact: Slava Monich <slava.monich@jolla.com>
*
* 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Nemo Mobile nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 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 <expat.h>
#include <stdlib.h>
#include <dlfcn.h>
#define EXPAT_FUNCTIONS(f) \
f(XML_Parser, XML_ExternalEntityParserCreate, \
(XML_Parser parser, const XML_Char* context, const XML_Char* encoding), \
(parser, context, encoding), NULL) \
f(XML_Bool, XML_ParserReset,\
(XML_Parser parser, const XML_Char* encoding), \
(parser, encoding), XML_FALSE) \
f(void, XML_SetUserData, \
(XML_Parser parser, void* userData), \
(parser, userData), (void)0) \
f(void, XML_SetUnknownEncodingHandler, \
(XML_Parser parser, XML_UnknownEncodingHandler handler, void* data), \
(parser, handler, data), (void)0) \
f(void, XML_SetCharacterDataHandler, \
(XML_Parser parser, XML_CharacterDataHandler handler), \
(parser, handler), (void)0) \
f(enum XML_Error, XML_UseForeignDTD, \
(XML_Parser parser, XML_Bool useDTD), \
(parser, useDTD), XML_ERROR_UNEXPECTED_STATE) \
f(enum XML_Status, XML_SetEncoding, \
(XML_Parser parser, const XML_Char* encoding), \
(parser, encoding), XML_STATUS_ERROR) \
f(void, XML_SetStartElementHandler, \
(XML_Parser parser, XML_StartElementHandler handler), \
(parser, handler), (void)0) \
f(void, XML_SetEndElementHandler, \
(XML_Parser parser, XML_EndElementHandler handler), \
(parser, handler), (void)0) \
f(void, XML_ParserFree, \
(XML_Parser parser), \
(parser), (void)0) \
f(int, XML_SetHashSalt, \
(XML_Parser parser, unsigned long salt), \
(parser, salt), 0) \
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f(enum XML_Status, XML_Parse, \
(XML_Parser parser, const char* s, int len, int isFinal), \
(parser, s, len, isFinal), XML_STATUS_ERROR)
#define EXPAT_NUM_FUNCTIONS (sizeof(expat_names)/sizeof(expat_names[0]))
#define EXPAT_NO_HANDLE ((void*)-1)
#define EXPAT_SO "/usr/lib/libexpat.so.1"
static const char* expat_names[] = {
"XML_ParserCreate",
#define FN_NAME(type,name,params,args,fail) #name,
EXPAT_FUNCTIONS(FN_NAME)
};
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static struct {
void* handle;
union {
struct expat_proc {
XML_Parser (*XML_ParserCreate)(const XML_Char* encoding);
#define FN_POINTER(type,name,params,args,fail) type (* name) params;
EXPAT_FUNCTIONS(FN_POINTER)
} expat;
void* entry[EXPAT_NUM_FUNCTIONS];
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} fn;
} expat;
/* XML_ParserCreate() is the special function where we load the library */
XML_Parser
XML_ParserCreate(
const XML_Char* encoding)
{
if (!expat.handle) {
expat.handle = dlopen(EXPAT_SO, RTLD_LAZY);
if (expat.handle) {
unsigned int i;
for (i=0; i<EXPAT_NUM_FUNCTIONS; i++) {
expat.fn.entry[i] = dlsym(expat.handle, expat_names[i]);
}
} else {
expat.handle = EXPAT_NO_HANDLE;
}
}
return expat.fn.expat.XML_ParserCreate ?
expat.fn.expat.XML_ParserCreate(encoding) :
NULL;
}
/* All other wrappers are generated by the preprocessor */
#define FN_IMPL(type,name,params,args,fail) type name params \
{ return expat.fn.expat.name ? expat.fn.expat.name args : fail; }
EXPAT_FUNCTIONS(FN_IMPL)