system/readline/readline.c (25 lines of code) (raw):
/****************************************************************************
* apps/system/readline/readline.c
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 <nuttx/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "system/readline.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: readline
*
* readline will read a line from the terminal and return it, using
* prompt as a prompt. If prompt is NULL or the empty string, no prompt
* is issued. The line returned is allocated with malloc(3);
* the caller must free it when finished. The line reāturned has the
* final newline removed, so only the text of the line remains.
*
****************************************************************************/
FAR char *readline(FAR const char *prompt)
{
FAR char *line = malloc(LINE_MAX);
if (line != NULL)
{
#ifdef CONFIG_READLINE_TABCOMPLETION
FAR const char *orig = readline_prompt(prompt);
#endif
if (readline_fd(line, LINE_MAX,
STDIN_FILENO, STDOUT_FILENO) == 0)
{
free(line);
line = NULL;
}
#ifdef CONFIG_READLINE_TABCOMPLETION
readline_prompt(orig);
#endif
}
return line;
}