From 9f2b12c2529e0fbe02693c35a82bd35168637c23 Mon Sep 17 00:00:00 2001 From: Gregory Nutt Date: Mon, 30 Sep 2013 11:34:04 -0600 Subject: Changes to NSH and readline to permit NSH to work on a platform with no file system --- apps/system/readline/std_readline.c | 158 ++++++++++++++++++++++++++++++++++++ 1 file changed, 158 insertions(+) create mode 100644 apps/system/readline/std_readline.c (limited to 'apps/system/readline/std_readline.c') diff --git a/apps/system/readline/std_readline.c b/apps/system/readline/std_readline.c new file mode 100644 index 000000000..8778f1677 --- /dev/null +++ b/apps/system/readline/std_readline.c @@ -0,0 +1,158 @@ +/**************************************************************************** + * apps/system/readline/std_readline.c + * + * Copyright (C) 2013 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt + * + * 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 + +#include +#include +#include + +#include "readline.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +static int readline_getc(FAR struct rl_common_s *vtbl); +static void readline_putc(FAR struct rl_common_s *vtbl, int ch); +static void readline_write(FAR struct rl_common_s *vtbl, + FAR const char *buffer, size_t buflen); + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static const struct rl_common_s g_stdreadline = +{ + readline_getc +#ifdef CONFIG_READLINE_ECHO + , readline_putc + , readline_write +#endif +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: readline_getc + ****************************************************************************/ + +static int readline_getc(FAR struct rl_common_s *vtbl) +{ + return up_getc(); +} + +/**************************************************************************** + * Name: readline_putc + ****************************************************************************/ + +#ifdef CONFIG_READLINE_ECHO +static void readline_putc(FAR struct rl_common_s *vtbl, int ch) +{ + up_putc(ch); +} +#endif + +/**************************************************************************** + * Name: readline_write + ****************************************************************************/ + +#ifdef CONFIG_READLINE_ECHO +static void readline_write(FAR struct rl_common_s *vtbl, + FAR const char *buffer, size_t buflen) +{ + for (; buflen > 0; buflen--) + { + up_putc(*buffer++); + } +} +#endif + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: std_readline + * + * readline() reads in at most one less than 'buflen' characters from + * 'instream' and stores them into the buffer pointed to by 'buf'. + * Characters are echoed on 'outstream'. Reading stops after an EOF or a + * newline. If a newline is read, it is stored into the buffer. A null + * terminator is stored after the last character in the buffer. + * + * This version of realine assumes that we are reading and writing to + * a VT100 console. This will not work well if 'instream' or 'outstream' + * corresponds to a raw byte steam. + * + * This function is inspired by the GNU readline but is an entirely + * different creature. + * + * Input Parameters: + * buf - The user allocated buffer to be filled. + * buflen - the size of the buffer. + * instream - The stream to read characters from + * outstream - The stream to each characters to. + * + * Returned values: + * On success, the (positive) number of bytes transferred is returned. + * EOF is returned to indicate either an end of file condition or a + * failure. + * + **************************************************************************/ + +ssize_t std_readline(FAR char *buf, int buflen) +{ + return readline_common((FAR struct rl_common_s *)&g_stdreadline, + buf, buflen); +} -- cgit v1.2.3