toaruos/kernel/misc/args.c
2014-06-07 23:51:01 -07:00

93 lines
2.0 KiB
C

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