89 lines
3.6 KiB
C
89 lines
3.6 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_gets_s.c
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 "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 arraay. 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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return lib_fgets(s, (size_t)n, stdin, false, true);
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}
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