hdynload.c

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/* Internal dynamic library functions loading */

#include "../fb.h"
#include "../fb_private_hdynload.h"

#include <dlfcn.h>
#define hDylibFree( lib ) dlclose( lib )
#define hDylibSymbol( lib, sym ) dlsym( lib, sym )

FB_DYLIB fb_hDynLoad(const char *libname, const char **funcname, void **funcptr)
{
        FB_DYLIB lib;
        ssize_t i;

        /* First look if library was already statically linked with current executable */
        if (!(lib = dlopen(NULL, RTLD_LAZY)))
                return NULL;
        if (!dlsym(lib, funcname[0])) {
                dlclose(lib);
                if (!(lib = dlopen(libname, RTLD_LAZY)))
                        return NULL;
        }

        /* Load functions */
        for (i = 0; funcname[i]; i++) {
                funcptr[i] = hDylibSymbol(lib, funcname[i]);
                if (!funcptr[i]) {
                        hDylibFree(lib);
                        return NULL;
                }
        }

        return lib;
}

int fb_hDynLoadAlso( FB_DYLIB lib, const char **funcname, void **funcptr, ssize_t count )
{
        ssize_t i;

        /* Load functions */
        for (i = 0; i < count; i++) {
                funcptr[i] = hDylibSymbol(lib, funcname[i]);
                if (!funcptr[i])
                        return -1;
        }

        return 0;
}

void fb_hDynUnload(FB_DYLIB *lib)
{
        if (*lib) {
                hDylibFree( *lib );
                *lib = NULL;
        }
}