104 lines
3.4 KiB
C
104 lines
3.4 KiB
C
/*
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* boblight
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* Copyright (C) Bob 2009
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*
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* boblight is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* boblight is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//if you define BOBLIGHT_DLOPEN, all boblight functions are defined as pointers
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//you can then call boblight_loadlibrary to load libboblight with dlopen and the function pointers with dlsym
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//if you pass NULL to boblight_loadlibrary's first argument, the default filename for libboblight is used
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//if boblight_loadlibrary returns NULL, dlopen and dlsym went ok, if not it returns a char* from dlerror
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//if you want to use the boblight functions from multiple files, you can define BOBLIGHT_DLOPEN in one file,
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//and define BOBLIGHT_DLOPEN_EXTERN in the other file, the functionpointers are then defined as extern
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#ifndef LIBBOBLIGHT
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#define LIBBOBLIGHT
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#if !defined(BOBLIGHT_DLOPEN) && !defined(BOBLIGHT_DLOPEN_EXTERN)
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#ifdef __cplusplus
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extern "C" {
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#endif
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//generate normal prototypes
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#define BOBLIGHT_FUNCTION(returnvalue, name, arguments) returnvalue name arguments
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#include "boblight-functions.h"
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#undef BOBLIGHT_FUNCTION
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#ifdef __cplusplus
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}
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#endif
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#elif defined(BOBLIGHT_DLOPEN)
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#include <dlfcn.h>
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#include <stddef.h>
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//generate function pointers
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#define BOBLIGHT_FUNCTION(returnvalue, name, arguments) returnvalue (* name ) arguments = NULL
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#include "boblight-functions.h"
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#undef BOBLIGHT_FUNCTION
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#ifdef __cplusplus
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#define BOBLIGHT_CAST(value) reinterpret_cast<value>
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#else
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#define BOBLIGHT_CAST(value) (value)
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#endif
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//gets a functionpointer from dlsym, and returns char* from dlerror if it didn't work
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#define BOBLIGHT_FUNCTION(returnvalue, name, arguments) \
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name = BOBLIGHT_CAST(returnvalue (*) arguments)(dlsym(p_boblight, #name)); \
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{ char* error = dlerror(); if (error) return error; }
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void* p_boblight = NULL; //where we put the lib
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//load function pointers
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char* boblight_loadlibrary(const char* filename)
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{
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if (filename == NULL)
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filename = "libboblight.so";
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if (p_boblight != NULL)
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{
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dlclose(p_boblight);
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p_boblight = NULL;
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}
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p_boblight = dlopen(filename, RTLD_NOW);
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if (p_boblight == NULL)
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return dlerror();
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//generate dlsym lines
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#include "boblight-functions.h"
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return NULL;
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}
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#undef BOBLIGHT_FUNCTION
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#undef BOBLIGHT_CAST
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//you can define BOBLIGHT_DLOPEN_EXTERN when you load the library in another file
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#elif defined(BOBLIGHT_DLOPEN_EXTERN)
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extern char* boblight_loadlibrary(const char* filename);
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extern void* p_boblight;
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#define BOBLIGHT_FUNCTION(returnvalue, name, arguments) extern returnvalue (* name ) arguments
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#include "boblight-functions.h"
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#undef BOBLIGHT_FUNCTION
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#endif //BOBLIGHT_DLOPEN_EXTERN
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#endif //LIBBOBLIGHT
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