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/*
* Copyright (c) 2017 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdbool.h>
#include <stddef.h>
#include <string.h>
#include <kern/arg.h>
#include <kern/init.h>
#include <kern/log.h>
#include <kern/macros.h>
#include <kern/panic.h>
/*
* Internally, all space characters are turned into null bytes so that
* values returned to callers directly point in the command line string,
* with no need for dynamic allocation.
*/
static char arg_cmdline[ARG_CMDLINE_MAX_SIZE] __initdata;
static const char *arg_cmdline_end __initdata;
void __init
arg_set_cmdline(const char *cmdline)
{
strlcpy(arg_cmdline, cmdline, sizeof(arg_cmdline));
}
static int __init
arg_setup(void)
{
size_t i, length;
length = strlen(arg_cmdline);
for (i = 0; i < length; i++) {
if (arg_cmdline[i] == ' ') {
arg_cmdline[i] = '\0';
}
}
arg_cmdline_end = arg_cmdline + length;
return 0;
}
INIT_OP_DEFINE(arg_setup);
void __init
arg_log_info(void)
{
char cmdline[sizeof(arg_cmdline)];
size_t i;
for (i = 0; &arg_cmdline[i] < arg_cmdline_end; i++) {
cmdline[i] = (arg_cmdline[i] == '\0') ? ' ' : arg_cmdline[i];
}
cmdline[i] = '\0';
log_info("arg: %s", cmdline);
}
static const char * __init
arg_walk(const char *s)
{
if (s == NULL) {
s = arg_cmdline;
} else {
for (;;) {
if (s >= arg_cmdline_end) {
return NULL;
}
if (*s == '\0') {
break;
}
s++;
}
}
for (;;) {
if (s >= arg_cmdline_end) {
return NULL;
}
if (*s != '\0') {
return s;
}
s++;
}
}
static const char * __init
arg_find_name_end(const char *arg)
{
const char *end;
end = strchr(arg, '=');
if (end == NULL) {
end = arg + strlen(arg);
}
return end;
}
static const char * __init
arg_find(const char *name)
{
const char *arg, *arg_name_end;
size_t arg_name_length, name_length;
name_length = strlen(name);
assert(name_length != 0);
for (arg = arg_walk(NULL); arg != NULL; arg = arg_walk(arg)) {
arg_name_end = arg_find_name_end(arg);
arg_name_length = arg_name_end - arg;
if ((arg_name_length == name_length)
&& (memcmp(arg, name, name_length) == 0)) {
return arg;
}
}
return NULL;
}
bool __init
arg_present(const char *name)
{
return (arg_find(name) != NULL);
}
const char * __init
arg_value(const char *name)
{
const char *arg, *value;
arg = arg_find(name);
if (arg == NULL) {
return NULL;
}
value = strchr(arg, '=');
if (value == NULL) {
return "";
}
return value + 1;
}
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