92 lines
2.0 KiB
C
92 lines
2.0 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2011-2013 Kevin Lange
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*
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* Kernel Argument Manager
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*
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* Arguments to the kernel are provided from the bootloader and
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* provide information such as what mode to pass to init, or what
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* hard disk partition should be mounted as root.
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*
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* This module provides access
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*/
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#include <system.h>
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#include <logging.h>
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#include <args.h>
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#include <hashmap.h>
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#include <tokenize.h>
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char * cmdline = NULL;
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hashmap_t * kernel_args_map = NULL;
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/**
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* Check if an argument was provided to the kernel. If the argument is
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* a simple switch, a response of 1 can be considered "on" for that
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* argument; otherwise, this just notes that the argument was present,
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* so the caller should check whether it is correctly set.
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*/
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int args_present(char * karg) {
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if (!kernel_args_map) return 0; /* derp */
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return hashmap_has(kernel_args_map, karg);
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}
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/**
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* Return the value associated with an argument provided to the kernel.
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*/
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char * args_value(char * karg) {
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if (!kernel_args_map) return 0; /* derp */
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return hashmap_get(kernel_args_map, karg);
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}
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/**
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* Parse the given arguments to the kernel.
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*
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* @param arg A string containing all arguments, separated by spaces.
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*/
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void args_parse(char * _arg) {
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/* Sanity check... */
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if (!_arg) { return; }
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char * arg = strdup(_arg);
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char * argv[1024];
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int argc = tokenize(arg, " ", argv);
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/* New let's parse the tokens into the arguments list so we can index by key */
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if (!kernel_args_map) {
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kernel_args_map = hashmap_create(10);
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}
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for (int i = 0; i < argc; ++i) {
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char * c = strdup(argv[i]);
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char * name;
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char * value;
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name = c;
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value = NULL;
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/* Find the first = and replace it with a null */
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char * v = c;
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while (*v) {
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if (*v == '=') {
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*v = '\0';
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v++;
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value = v;
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goto _break;
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}
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v++;
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}
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_break:
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hashmap_set(kernel_args_map, name, value);
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}
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free(arg);
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}
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