#include <stddef.h>
#include <stdlib.h>
#include <string.h>

#include "panic.h"
#include "term.h"
#include "bootinfo.h"

#define CMDLINE_MAX 128

static char boot_cmdline[CMDLINE_MAX];

static uint32_t *read_tag(uint32_t *tag) {
	uint32_t type = tag[0];
	size_t size = tag[1];

	switch(type) {
		case 0: return NULL;
		case 1: {
			size_t cmdline_len = size - 2 * sizeof(uint32_t);
			if(cmdline_len > CMDLINE_MAX) {
				panic("Command line argument length %d exceeds maximum length %d", cmdline_len, CMDLINE_MAX);
			}
			char* cmdline = (char*)(tag + 2);
			memcpy(boot_cmdline, cmdline, cmdline_len);
			break;
		}
		default: break;
	}
	if(size % 8 != 0) {
		size += 8 - (size % 8);
	}
	return tag + size / sizeof(uint32_t);
}

void bootinfo_load(void *ptr) {
	uint32_t *p = ptr;
	p += 2;
	while(p != NULL) {
		p = read_tag(p);
	}
}

char* bootinfo_get_cmdline(void) {
	return boot_cmdline;
}