79 lines
2.9 KiB
C
79 lines
2.9 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_gets_s.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <unistd.h>
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#include "libc.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: gets
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*
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* Description:
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* gets() reads a line from stdin into the buffer pointed to by s until
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* either a terminating newline or EOF, which it replaces with '\0'. Reads
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* at most n-1 characters from stdin into the array pointed to by str until
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* new-line character, end-of-file condition, or read error. The newline
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* character, if encountered, is not saved in the array. A NUL character
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* is written immediately after the last character read into the array, or
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* to str[0] if no characters were read.
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*
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* If n is zero or is greater than RSIZE_MAX, a null character is written
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* to str[0] but the function reads and discards characters from stdin
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* until new-line character, end-of-file condition, or read error (not
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* implemented).
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*
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* If n-1 characters have been read, continues reading and discarding the
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* characters from stdin until new-line character, end-of-file condition,
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* or read error.
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*
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****************************************************************************/
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FAR char *gets_s(FAR char *s, rsize_t n)
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{
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/* Handle the case where n is out of range as required */
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if (n < 1 || n > RSIZE_MAX)
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{
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/* Set n=1, i.e., room only for the NUL terminator */
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n = 1;
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}
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/* Then let lib_fgets() do the heavy lifting */
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#ifdef CONFIG_FILE_STREAM
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return lib_fgets(s, n, stdin, false, true);
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#else
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return lib_dgets(s, n, STDIN_FILENO, false, true);
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#endif
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}
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