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Diffstat (limited to 'nuttx/lib/stdio/lib_gets.c')
-rw-r--r-- | nuttx/lib/stdio/lib_gets.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/nuttx/lib/stdio/lib_gets.c b/nuttx/lib/stdio/lib_gets.c new file mode 100644 index 000000000..95a6b36eb --- /dev/null +++ b/nuttx/lib/stdio/lib_gets.c @@ -0,0 +1,120 @@ +/**************************************************************************** + * lib/stdio/lib_gets.c + * + * Copyright (C) 2007-2008, 2011-2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <stdio.h> +#include <limits.h> +#include <string.h> + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Global Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Global Constant Data + ****************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Constant Data + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: gets + * + * Description: + * gets() reads a line from stdin into the buffer pointed to by s until + * either a terminating newline or EOF, which it replaces with '\0'. No + * check for buffer overrun is performed + * + * This API should not be used because it is inherently unsafe. Consider + * using fgets which is safer and slightly more efficient. + * + **************************************************************************/ + +FAR char *gets(FAR char *s) +{ + /* gets is ALMOST the same as fgets using stdin and no length limit + * (hence, the unsafeness of gets). So let fgets do most of the work. + */ + + FAR char *ret = fgets(s, INT_MAX, stdin); + if (ret) + { + /* Another subtle difference from fgets is that gets replaces + * end-of-line markers with null terminators. We will do that as + * a second step (with some loss in performance). + */ + + int len = strlen(ret); + if (len > 0 && ret[len-1] == '\n') + { + ret[len-1] = '\0'; + } + } + + return ret; +} + |