70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
/*
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* \brief Read program arguments from the config file
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* \date 2012-04-19
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* \author Christian Prochaska
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*/
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/*
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* Copyright (C) 2012-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#include <os/config.h>
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using namespace Genode;
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/* external symbols provided by Genode's startup code */
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extern char **genode_argv;
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extern int genode_argc;
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__attribute__((constructor))
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void init_config_args(void)
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{
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int argc = 0;
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static char **argv;
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/* count the number of arguments */
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try {
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Xml_node arg_node = config()->xml_node().sub_node("arg");
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for (;;) {
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/* check if the 'value' attribute exists */
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arg_node.attribute("value");
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argc++;
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arg_node = arg_node.next("arg");
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}
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}
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catch (Xml_node::Nonexistent_sub_node) { }
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catch (Xml_node::Nonexistent_attribute)
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{
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PERR("<arg> node has no 'value' attribute, ignoring further <arg> nodes");
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}
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if (argc == 0)
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return;
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argv = (char**)env()->heap()->alloc((argc + 1) * sizeof(char*));
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/* read the arguments */
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Xml_node arg_node = config()->xml_node().sub_node("arg");
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try {
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for (int i = 0; i < argc; i++) {
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static char buf[512];
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arg_node.attribute("value").value(buf, sizeof(buf));
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size_t arg_size = strlen(buf) + 1;
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argv[i] = (char*)env()->heap()->alloc(arg_size);
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strncpy(argv[i], buf, arg_size);
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arg_node = arg_node.next("arg");
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}
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} catch (Xml_node::Nonexistent_sub_node) { }
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argv[argc] = 0;
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/* register command-line arguments at Genode's startup code */
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genode_argc = argc;
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genode_argv = argv;
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}
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