nuttx/libs/libc/termios/lib_ttynamer.c

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/****************************************************************************
* libs/libc/termios/lib_ttynamer.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ttyname_r
*
* Description:
* The ttyname_r() function shall store the null-terminated pathname of
* the terminal associated with the file descriptor fildes in the
* character array referenced by name. The array is namesize characters
* long and should have space for the name and the terminating null
* character. The maximum length of the terminal name shall be
* {TTY_NAME_MAX}.
*
* Input Parameters:
* fd - The 'fd' argument is an open file descriptor associated with
* a terminal.
* buf - Caller provided buffer to hold tty name.
* buflen - The size of the caller-provided buffer.
*
* Returned Value:
* If successful, the ttyname_r() function shall return zero.
* Otherwise, an error number shall be returned to indicate the error.
*
****************************************************************************/
int ttyname_r(int fd, FAR char *buf, size_t buflen)
{
if (!isatty(fd))
{
return ENOTTY;
}
if (buflen >= TTY_NAME_MAX)
{
return fcntl(fd, F_GETPATH, buf) < 0 ? get_errno() : 0;
}
else
{
char name[TTY_NAME_MAX];
if (fcntl(fd, F_GETPATH, name) < 0)
{
return get_errno();
}
if (strlen(name) >= buflen)
{
return ERANGE;
}
strcpy(buf, name);
return OK;
}
}