#include <stdint.h>
#include <stddef.h>

// minimal set of string routines, copied from KarlOS

void *memset(void *ptr, int value, size_t num)
{
    __asm__ ("rep stosb"
        : "+D"(ptr), "+c"(num)
        : "a"(value)
        : "memory");
    return ptr;
}

void *memcpy(void *restrict dest, const void *restrict src, size_t num)
{
    __asm__ ("rep movsb"
        : "+D"(dest), "+S"(src), "+c"(num)
        :
        : "memory");
    return dest;
}

int memcmp(const void *ptr, const void *ptr2, size_t num)
{
    unsigned char *d = (unsigned char *)ptr;
    unsigned char *b = (unsigned char *)ptr2;
    for (size_t i = 0; i < num; i++) {
        if (d[i] != b[i]) {
            return (d[i] - b[i]);
        }
    }
    return 0;
}

size_t strlen(const char *s)
{
    size_t len = 0;
    while (*s != '\0') {
        s++;
        len++;
    }
    return len;
}

// Helpers from bztsrc's bootboot codebase

/**
 * convert ascii octal number to binary number
 */
int octbin(unsigned char *str,int size)
{
    int s=0;
    unsigned char *c=str;
    while(size-->0){
        s*=8;
        s+=*c-'0';
        c++;
    }
    return s;
}

/**
 * convert ascii hex number to binary number
 */
int hexbin(unsigned char *str, int size)
{
    int v=0;
    while(size-->0){
        v <<= 4;
        if(*str>='0' && *str<='9')
            v += (int)((unsigned char)(*str)-'0');
        else if(*str >= 'A' && *str <= 'F')
            v += (int)((unsigned char)(*str)-'A'+10);
        str++;
    }
    return v;
}

typedef struct {
    uint8_t *ptr;
    uint64_t size;
} file_t;

#include "bootboot.h"
#include "fs.h"

// ELF64

#define EI_NIDENT 16
#define EI_MAG0 0x7F
#define EI_MAG1 'E'
#define EI_MAG2 'L'
#define EI_MAG3 'F'

typedef struct {
	unsigned char e_ident[EI_NIDENT];
	uint16_t      e_type;
	uint16_t      e_machine;
	uint32_t      e_version;
	uint64_t      e_entry;
	uint64_t      e_phoff;
	uint64_t      e_shoff;
	uint32_t      e_flags;
	uint16_t      e_ehsize;
	uint16_t      e_phentsize;
	uint16_t      e_phnum;
	uint16_t      e_shentsize;
	uint16_t      e_shnum;
	uint16_t      e_shstrndx;
} Elf64_Ehdr;

typedef struct {
	uint32_t p_type;
	uint32_t p_flags;
	uint64_t p_offset;
	uint64_t p_vaddr;
	uint64_t p_paddr;
	uint64_t p_filesz;
	uint64_t p_memsz;
	uint64_t p_align;
} Elf64_Phdr;

void
loader_main(void)
{
	for (;;) {}
}