File build/libcackey_wrap.c.in artifact 4c95cbc88b part of check-in 9043258dc4

#define _GNU_SOURCE
#include <dlfcn.h>

#include "config.h"

#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#define CK_PTR *
#define CK_DEFINE_FUNCTION(returnType, name) returnType name
#define CK_DECLARE_FUNCTION(returnType, name) returnType name
#define CK_DECLARE_FUNCTION_POINTER(returnType, name) returnType (* name)
#define CK_CALLBACK_FUNCTION(returnType, name) returnType (* name)
#ifndef NULL_PTR
#  define NULL_PTR 0
#endif

#include "./pkcs11/pkcs11.h"

static void *libcackey_wrap_handle = NULL_PTR;

static void libcackey_wrap_init(void) {
	Dl_info libinfo;
	int dladdr_ret;
	char *library, *libraryDir, *libraryDirLastSlash;

	if (libcackey_wrap_handle) {
		return;
	}

	dladdr_ret = dladdr(libcackey_wrap_init, &libinfo);
	if (dladdr_ret == 0) {
		fprintf(stderr, "Unable to resolve path: %s\n", dlerror());

		abort();

		return;
	}

	if (!libinfo.dli_fname) {
		fprintf(stderr, "Unable to lookup filename\n");

		abort();

		return;
	}

	libraryDir = strdup(libinfo.dli_fname);
	libraryDirLastSlash = strrchr(libraryDir, '/');
	if (!libraryDirLastSlash) {
		fprintf(stderr, "File name returned is not an absolute path: %s\n", libraryDir);

		abort();

		return;
	}
	*libraryDirLastSlash = '\0';

	asprintf(&library, "%s/libcackey.so", libraryDir);

	libcackey_wrap_handle = dlmopen(LM_ID_NEWLM, library, RTLD_LOCAL | RTLD_NOW);

	if (!libcackey_wrap_handle) {
		fprintf(stderr, "Unable to load \"%s\": %s\n", library, dlerror());

		abort();

		return;
	}

	free(library);

	return;
}