rt-thread-official/components/libc/compilers/armlibc/stubs.c

334 lines
6.8 KiB
C

/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2012-11-23 Yihui The first version
* 2013-11-24 aozima fixed _sys_read()/_sys_write() issues.
* 2014-08-03 bernard If using msh, use system() implementation
* in msh.
* 2020-08-05 Meco Man fixed _sys_flen() compiling-warning when
* RT_USING_DFS is not defined
*/
#include <string.h>
#include <rt_sys.h>
#include "rtthread.h"
#include "libc.h"
#ifdef RT_USING_DFS
#include "dfs_posix.h"
#endif
#ifdef __CLANG_ARM
__asm(".global __use_no_semihosting\n\t");
#else
#pragma import(__use_no_semihosting_swi)
#endif
/* Standard IO device handles. */
#define STDIN 0
#define STDOUT 1
#define STDERR 2
/* 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;
#endif
}
int _sys_close(FILEHANDLE fh)
{
#ifndef RT_USING_DFS
return 0;
#else
if (fh <= STDERR) return 0;
return close(fh);
#endif
}
/*
* Read from a file. Can return:
* - zero if the read was completely successful
* - the number of bytes _not_ read, if the read was partially successful
* - the number of bytes not read, plus the top bit set (0x80000000), if
* the read was partially successful due to end of file
* - -1 if some error other than EOF occurred
*
* It is also legal to signal EOF by returning no data but
* signalling no error (i.e. the top-bit-set mechanism need never
* be used).
*
* So if (for example) the user is trying to read 8 bytes at a time
* from a file in which only 5 remain, this routine can do three
* equally valid things:
*
* - it can return 0x80000003 (3 bytes not read due to EOF)
* - OR it can return 3 (3 bytes not read), and then return
* 0x80000008 (8 bytes not read due to EOF) on the next attempt
* - OR it can return 3 (3 bytes not read), and then return
* 8 (8 bytes not read, meaning 0 read, meaning EOF) on the next
* attempt
*
* `mode' exists for historical reasons and must be ignored.
*/
int _sys_read(FILEHANDLE fh, unsigned char *buf, unsigned len, int mode)
{
#ifdef RT_USING_DFS
int size;
#endif
if (fh == STDIN)
{
#ifdef RT_USING_POSIX
size = libc_stdio_read(buf, len);
return len - size;
#else
/* no stdin */
return -1;
#endif
}
if ((fh == STDOUT) || (fh == STDERR))
return -1;
#ifndef RT_USING_DFS
return 0;
#else
size = read(fh, buf, len);
if (size >= 0)
return len - size;
else
return -1;
#endif
}
/*
* Write to a file. Returns 0 on success, negative on error, and
* the number of characters _not_ written on partial success.
* `mode' exists for historical reasons and must be ignored.
*/
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))
{
#if !defined(RT_USING_CONSOLE) || !defined(RT_USING_DEVICE)
return 0;
#else
#ifdef RT_USING_POSIX
size = libc_stdio_write(buf, len);
return len - size;
#else
if (rt_console_get_device())
{
rt_device_write(rt_console_get_device(), -1, buf, len);
return 0;
}
return -1;
#endif
#endif
}
if (fh == STDIN) return -1;
#ifndef RT_USING_DFS
return 0;
#else
size = write(fh, buf, len);
if (size >= 0)
return len - size;
else
return -1;
#endif
}
/*
* Move the file position to a given offset from the file start.
* Returns >=0 on success, <0 on failure.
*/
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, 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 RT_NULL;
}
/* This function writes a character to the console. */
void _ttywrch(int ch)
{
#ifdef RT_USING_CONSOLE
char c;
c = (char)ch;
rt_kprintf(&c);
#endif
}
RT_WEAK 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)
{
#ifdef RT_USING_DFS
struct stat stat;
if (fh < STDERR)
return -1;
fstat(fh, &stat);
return stat.st_size;
#else
return -1;
#endif
}
int _sys_istty(FILEHANDLE fh)
{
if((STDIN <= fh) && (fh <= STDERR))
return 1;
else
return 0;
}
int remove(const char *filename)
{
#ifndef RT_USING_DFS
return -1;
#else
return unlink(filename);
#endif
}
#if defined(RT_USING_FINSH) && defined(FINSH_USING_MSH) && defined(RT_USING_MODULE) && defined(RT_USING_DFS)
/* use system(const char *string) implementation in the msh */
#else
int system(const char *string)
{
RT_ASSERT(0);
for (;;);
}
#endif
#ifdef __MICROLIB
#include <stdio.h>
int fputc(int c, FILE *f)
{
char ch[2] = {0};
ch[0] = c;
rt_kprintf(&ch[0]);
return 1;
}
int fgetc(FILE *f)
{
#ifdef RT_USING_POSIX
char ch;
if (libc_stdio_read(&ch, 1) == 1)
return ch;
#endif
return -1;
}
#endif