radare2/libr/lang/p/c.c

/* radare - LGPL - Copyright 2011-2017 pancake */
/* vala extension for libr (radare2) */
// TODO: add cache directory (~/.r2/cache)

#include "r_lib.h"
#include "r_core.h"
#include "r_lang.h"

static int ac = 0;
static const char **av = NULL;

static bool lang_c_set_argv(RLang *lang, int argc, const char **argv) {
	ac = argc;
	av = argv;
	return true;
}

static int lang_c_file(RLang *lang, const char *file) {
	char *a, *cc, *p, name[512];
	const char *libpath, *libname;
	void *lib;

	if (strlen (file) > (sizeof (name) - 10)) {
		return false;
	}
	if (!strstr (file, ".c")) {
		sprintf (name, "%s.c", file);
	} else {
		strcpy (name, file);
	}
	if (!r_file_exists (name)) {
		eprintf ("file not found (%s)\n", name);
		return false;
	}

	a = (char*)r_str_lchr (name, '/');
	if (a) {
		*a = 0;
		libpath = name;
		libname = a + 1;
	} else {
		libpath = ".";
		libname = name;
	}
	r_sys_setenv ("PKG_CONFIG_PATH", R2_LIBDIR"/pkgconfig");
	p = strstr (name, ".c");
	if (p) {
		*p=0;
	}
	cc = r_sys_getenv ("CC");
	if (!cc || !*cc) {
		cc = strdup ("gcc");
	}
	char *buf = r_str_newf ("%s -fPIC -shared %s -o %s/lib%s."R_LIB_EXT
		" $(pkg-config --cflags --libs r_core)", cc, file, libpath, libname);
	free (cc);
	if (r_sandbox_system (buf, 1) != 0) {
		free (buf);
		return false;
	}
	free (buf);
	buf = r_str_newf ("%s/lib%s."R_LIB_EXT, libpath, libname);
	lib = r_lib_dl_open (buf);
	if (lib) {
		void (*fcn)(RCore *, int argc, const char **argv);
		fcn = r_lib_dl_sym (lib, "entry");
		if (fcn) {
			fcn (lang->user, ac, av);
			ac = 0;
			av = NULL;
		} else {
			eprintf ("Cannot find 'entry' symbol in library\n");
		}
		r_lib_dl_close (lib);
	} else {
		eprintf ("Cannot open library\n");
	}
	r_file_rm (buf); // remove lib
	free (buf);
	return 0;
}

static int lang_c_init(void *user) {
	// TODO: check if "valac" is found in path
	return true;
}

static int lang_c_run(RLang *lang, const char *code, int len) {
	FILE *fd = fopen (".tmp.c", "w");
	if (fd) {
		fputs ("#include <r_core.h>\n\nvoid entry(RCore *core, int argc, const char **argv) {\n", fd);
		fputs (code, fd);
		fputs ("\n}\n", fd);
		fclose (fd);
		lang_c_file (lang, ".tmp.c");
		r_file_rm (".tmp.c");
	} else eprintf ("Cannot open .tmp.c\n");
	return true;
}

static RLangPlugin r_lang_plugin_c = {
	.name = "c",
	.ext = "c",
	.desc = "C language extension",
	.license = "LGPL",
	.run = lang_c_run,
	.init = (void*)lang_c_init,
	.run_file = (void*)lang_c_file,
	.set_argv = (void*)lang_c_set_argv,
};