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120 lines
4.9 KiB
120 lines
4.9 KiB
/**************************************************************************** |
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* lib/stdio/lib_gets.c |
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* |
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* Copyright (C) 2007-2008, 2011-2012 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 <stdio.h> |
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#include <limits.h> |
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#include <string.h> |
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/**************************************************************************** |
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* Definitions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Type Declarations |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Function Prototypes |
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****************************************************************************/ |
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/**************************************************************************** |
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* Global Function Prototypes |
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****************************************************************************/ |
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/**************************************************************************** |
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* Global Constant Data |
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****************************************************************************/ |
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/**************************************************************************** |
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* Global Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Constant Data |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Functions |
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****************************************************************************/ |
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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'. No |
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* check for buffer overrun is performed |
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* |
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* This API should not be used because it is inherently unsafe. Consider |
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* using fgets which is safer and slightly more efficient. |
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* |
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**************************************************************************/ |
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FAR char *gets(FAR char *s) |
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{ |
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/* gets is ALMOST the same as fgets using stdin and no length limit |
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* (hence, the unsafeness of gets). So let fgets do most of the work. |
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*/ |
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FAR char *ret = fgets(s, INT_MAX, stdin); |
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if (ret) |
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{ |
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/* Another subtle difference from fgets is that gets replaces |
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* end-of-line markers with null terminators. We will do that as |
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* a second step (with some loss in performance). |
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*/ |
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int len = strlen(ret); |
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if (len > 0 && ret[len-1] == '\n') |
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{ |
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ret[len-1] = '\0'; |
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} |
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} |
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return ret; |
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} |
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