#include "kernel/syscalls.h"

extern char **environ;
//struct _reent *_impure_ptr;

// generic syscall interface!

int __attribute__ ((noinline)) syscall(int call, int p1, int p2, int p3)
{
	int ebx; // will hold return value;

	// select syscall and pass params
	asm("pusha");

	asm("mov %0, %%eax"::"m"(call)); 

	asm("mov %0,%%edx"::"m"(p1));
	asm("mov %0,%%ecx"::"m"(p2));
	asm("mov %0,%%ebx"::"m"(p3));

	// interrrupt
	asm("int $0x80");

	// get return value
        asm("mov %%ebx, %0": "=b" (ebx));

	asm("popa");

	return ebx;
}

// fool os custom
int readdir(const char *name,fs_dirent  *dirs,int max)
{

    return syscall(SYSCALL_READDIR,name,dirs,max);
}

int has_data_waiting()
{

    return syscall(SYSCALL_HAS_DATA,0,0,0);
}

int fool_tune(int v1, int v2, int v3)
{

    return syscall(SYSCALL_TUNE,v1,v2,v3);
}

void _exit(int ret)
{
    _exit2(ret,environ);
}

void _exit2(int ret,char **environ)
{
    return syscall(SYSCALL_EXIT,ret,environ,0);
}

//required by newlibc
int close(int file) 
{
    return syscall(SYSCALL_CLOSE,file,0,0);
}

int isatty(int file) 
{
    return syscall(SYSCALL_ISATTY,file,0,0);
}

int lseek(int file, int ptr, int dir) 
{
    return syscall(SYSCALL_LSEEK,file,ptr,dir);
}

int read(int file, char *ptr, int len)
{

    return syscall(SYSCALL_READ,file,ptr,len);
}

int open(const char *name, int flags, int mode)
{
    return syscall(SYSCALL_OPEN,name,flags,mode);
}

int write(int file, char *ptr, int len) 
{
    return syscall(SYSCALL_WRITE,file,ptr,len);
}

int execve(char *name, char **argv, char **env) 
{
    return syscall(SYSCALL_EXECVE,name,argv,env);
}

uint32_t sbrk(int incr) 
{
    return syscall(SYSCALL_SBRK,incr,0,0);
}

int gettimeofday(struct timeval *tv, void *tz)
{
    return syscall(SYSCALL_GETTIMEOFDAY,tv,tz,0);
}

int fork(void)
{
    return syscall(SYSCALL_FORK,0,0,0);
}

int getpid(void)
{
    return syscall(SYSCALL_GETPID,0,0,0);
}

int kill(int pid, int sig)
{
    return syscall(SYSCALL_KILL,pid,sig,0);
}

int link(char *old, char *ne)
{
    return syscall(SYSCALL_LINK,old,ne,0);
}

int unlink(char *name)
{
    return syscall(SYSCALL_UNLINK,name,0,0);
}

int times(struct tms *buf)
{
    return syscall(SYSCALL_TIMES,buf,0,0);
}

int wait(int *status)
{
    return syscall(SYSCALL_WAIT,status,0,0);
}

int stat(const char *file, struct stat *st)
{
    return syscall(SYSCALL_STAT,file,st,0);
}

int lstat(const char *file, struct stat *st)
{
    return syscall(SYSCALL_LSTAT,file,st,0);
}

int fstat(int file, struct stat *st)
{
    return syscall(SYSCALL_FSTAT,file,st,0);
}