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/*
* File : stubs.c
* Brief : reimplement some basic functions of arm standard c library
*
* This file is part of Device File System in RT-Thread RTOS
* COPYRIGHT (C) 2004-2012, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE.
*
* Change Logs:
* Date Author Notes
* 2012-11-23 Yihui The first version
* 2013-11-24 aozima fixed _sys_read()/_sys_write() issues.
*/
#include <string.h>
#include <rt_sys.h>
#include "rtthread.h"
#ifdef RT_USING_DFS
#include "dfs_posix.h"
#endif
#pragma import(__use_no_semihosting_swi)
/* TODO: Standard IO device handles. */
#define STDIN 1
#define STDOUT 2
#define STDERR 3
/* Standard IO device name defines. */
const char __stdin_name[] = "STDIN";
const char __stdout_name[] = "STDOUT";
const char __stderr_name[] = "STDERR";
/**
* required by fopen() and freopen().
*
* @param name - file name with path.
* @param openmode - a bitmap hose bits mostly correspond directly to
* the ISO mode specification.
* @return -1 if an error occurs.
*/
FILEHANDLE _sys_open(const char *name, int openmode)
{
#ifdef RT_USING_DFS
int fd;
int mode = O_RDONLY;
#endif
/* Register standard Input Output devices. */
if (strcmp(name, __stdin_name) == 0)
return (STDIN);
if (strcmp(name, __stdout_name) == 0)
return (STDOUT);
if (strcmp(name, __stderr_name) == 0)
return (STDERR);
#ifndef RT_USING_DFS
return -1;
#else
/* Correct openmode from fopen to open */
if (openmode & OPEN_PLUS)
{
if (openmode & OPEN_W)
{
mode |= (O_RDWR | O_TRUNC | O_CREAT);
}
else if (openmode & OPEN_A)
{
mode |= (O_RDWR | O_APPEND | O_CREAT);
}
else
mode |= O_RDWR;
}
else
{
if (openmode & OPEN_W)
{
mode |= (O_WRONLY | O_TRUNC | O_CREAT);
}
else if (openmode & OPEN_A)
{
mode |= (O_WRONLY | O_APPEND | O_CREAT);
}
}
fd = open(name, mode, 0);
if(fd < 0)
return -1;
else
return fd + STDERR + 1;
#endif
}
int _sys_close(FILEHANDLE fh)
{
#ifndef RT_USING_DFS
return 0;
#else
if (fh < STDERR)
return 0;
return close(fh - STDERR - 1);
#endif
}
/**
* read data
*
* @param fh - file handle
* @param buf - buffer to save read data
* @param len - max length of data buffer
* @param mode - useless, for historical reasons
* @return The number of bytes not read.
*/
int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
{
#ifdef RT_USING_DFS
int size;
#endif
if (fh == STDIN)
{
/* TODO */
return 0;
}
if ((fh == STDOUT) || (fh == STDERR))
return -1;
#ifndef RT_USING_DFS
return 0;
#else
size = read(fh - STDERR - 1, buf, len);
if(size >= 0)
return len - size;
else
return -1;
#endif
}
/**
* write data
*
* @param fh - file handle
* @param buf - data buffer
* @param len - buffer length
* @param mode - useless, for historical reasons
* @return a positive number representing the number of characters not written.
*/
int _sys_write(FILEHANDLE fh, const unsigned char *buf, unsigned len, int mode)
{
#ifdef RT_USING_DFS
int size;
#endif
if ((fh == STDOUT) || (fh == STDERR))
{
#ifndef RT_USING_CONSOLE
return 0;
#else
rt_device_t console_device;
extern rt_device_t rt_console_get_device(void);
console_device = rt_console_get_device();
if (console_device != 0) rt_device_write(console_device, 0, buf, len);
return 0;
#endif
}
if(fh == STDIN)
return -1;
#ifndef RT_USING_DFS
return 0;
#else
size = write(fh - STDERR - 1, buf, len);
if(size >= 0)
return len - size;
else
return -1;
#endif
}
/**
* put he file pointer at offset pos from the beginning of the file.
*
* @param pos - offset
* @return the current file position, or -1 on failed
*/
int _sys_seek(FILEHANDLE fh, long pos)
{
if (fh < STDERR)
return -1;
#ifndef RT_USING_DFS
return -1;
#else
/* position is relative to the start of file fh */
return lseek(fh - STDERR - 1, pos, 0);
#endif
}
/**
* used by tmpnam() or tmpfile()
*/
int _sys_tmpnam(char *name, int fileno, unsigned maxlength)
{
return -1;
}
char *_sys_command_string(char *cmd, int len)
{
/* no support */
return cmd;
}
void _ttywrch(int ch)
{
char c;
c = (char)ch;
rt_kprintf(&c);
}
void _sys_exit(int return_code)
{
/* TODO: perhaps exit the thread which is invoking this function */
while (1);
}
/**
* return current length of file.
*
* @param fh - file handle
* @return file length, or -1 on failed
*/
long _sys_flen(FILEHANDLE fh)
{
return -1;
}
int _sys_istty(FILEHANDLE fh)
{
return 0;
}
int remove(const char *filename)
{
#ifndef RT_USING_DFS
return -1;
#else
return unlink(filename);
#endif
}
/* rename() is defined in dfs_posix.c instead */
#if 0
int rename(const char *old, const char *new)
{
return -1;
}
#endif
int system(const char *string)
{
RT_ASSERT(0);
for(;;);
}
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