224 lines
8.1 KiB
C
224 lines
8.1 KiB
C
/****************************************************************************
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* apps/include/system/readline.h
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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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#ifndef __APPS_INCLUDE_SYSTEM_READLINE_H
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#define __APPS_INCLUDE_SYSTEM_READLINE_H
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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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#ifdef CONFIG_SYSTEM_READLINE
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Tab completion cannot be supported if there is no console echo */
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#ifndef CONFIG_READLINE_ECHO
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# undef CONFIG_READLINE_TABCOMPLETION
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#endif
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/* Make sure that the are valid values for all tab-completion settings */
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#ifdef CONFIG_READLINE_TABCOMPLETION
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# ifndef CONFIG_READLINE_MAX_BUILTINS
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# define CONFIG_READLINE_MAX_BUILTINS 64
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# endif
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# ifndef CONFIG_READLINE_MAX_EXTCMDS
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# define CONFIG_READLINE_MAX_EXTCMDS 64
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# endif
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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#if defined(CONFIG_READLINE_TABCOMPLETION) && \
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defined(CONFIG_READLINE_HAVE_EXTMATCH)
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struct extmatch_vtable_s
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{
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CODE int (*count_matches)(FAR char *name, FAR int *matches, int namelen);
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CODE FAR const char *(*getname)(int index);
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};
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#endif
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: readline_prompt
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*
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* If a prompt string is used by the application, then the application
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* must provide the prompt string to readline() by calling this function.
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* This is needed only for tab completion in cases where is it necessary
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* to reprint the prompt string.
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*
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* Input Parameters:
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* prompt - The prompt string. This function may then be
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* called with that value in order to restore the previous vtable.
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*
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* Returned values:
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* Returns the previous value of the prompt string. This function may
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* then be called with that value in order to restore the previous prompt.
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*
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* Assumptions:
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* The prompt string is statically allocated a global. readline() will
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* simply remember the pointer to the string. The string must stay
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* allocated and available. Only one prompt string is supported. If
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* there are multiple clients of readline(), they must all share the same
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* prompt string (with exceptions in the case of the kernel build).
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*
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****************************************************************************/
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#ifdef CONFIG_READLINE_TABCOMPLETION
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FAR const char *readline_prompt(FAR const char *prompt);
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#else
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# define readline_prompt(p)
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#endif
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/****************************************************************************
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* Name: readline_extmatch
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*
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* If the applications supports a command set, then it may call this
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* function in order to provide support for tab complete on these
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* "external" commands
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*
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* Input Parameters:
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* vtbl - Callbacks to access the external names.
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*
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* Returned values:
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* Returns the previous vtable pointer. This function may then be
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* called with that value in order to restore the previous vtable.
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*
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* Assumptions:
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* The vtbl string is statically allocated a global. readline() will
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* simply remember the pointer to the structure. The structure must stay
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* allocated and available. Only one instance of such a structure is
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* supported. If there are multiple clients of readline(), they must all
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* share the same tab-completion logic (with exceptions in the case of
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* the kernel build).
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*
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****************************************************************************/
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#if defined(CONFIG_READLINE_TABCOMPLETION) && \
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defined(CONFIG_READLINE_HAVE_EXTMATCH)
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FAR const struct extmatch_vtable_s *
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readline_extmatch(FAR const struct extmatch_vtable_s *vtbl);
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#endif
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/****************************************************************************
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* Name: readline_fd
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*
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* readline_fd() reads in at most one less than 'buflen' characters from
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* 'infd' and stores them into the buffer pointed to by 'buf'.
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* Characters are echoed on 'outfd'. Reading stops after an EOF or a
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* newline. If a newline is read, it is stored into the buffer. A null
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* terminator is stored after the last character in the buffer.
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*
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* This version of readline_fd assumes that we are reading and writing to
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* a VT100 console. This will not work well if 'infd' or 'outfd'
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* corresponds to a raw byte steam.
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*
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* This function is inspired by the GNU readline but is an entirely
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* different creature.
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*
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* Input Parameters:
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* buf - The user allocated buffer to be filled.
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* buflen - the size of the buffer.
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* infd - The file to read characters from
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* outfd - The file to each characters to.
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*
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* Returned values:
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* On success, the (positive) number of bytes transferred is returned.
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* EOF is returned to indicate either an end of file condition or a
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* failure.
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*
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****************************************************************************/
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ssize_t readline_fd(FAR char *buf, int buflen, int infd, int outfd);
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/****************************************************************************
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* Name: readline
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*
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* readline() is same to readline_fd() but accept a file stream instead
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* of a file handle.
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*
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****************************************************************************/
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#ifdef CONFIG_FILE_STREAM
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ssize_t readline(FAR char *buf, int buflen, FILE *instream, FILE *outstream);
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#endif
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/****************************************************************************
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* Name: std_readline
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*
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* readline() reads in at most one less than 'buflen' characters from
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* 'stdin' and stores them into the buffer pointed to by 'buf'.
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* Characters are echoed on 'stdout'. Reading stops after an EOF or a
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* newline. If a newline is read, it is stored into the buffer. A null
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* terminator is stored after the last character in the buffer.
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*
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* This version of realine assumes that we are reading and writing to
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* a VT100 console. This will not work well if 'stdin' or 'stdout'
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* corresponds to a raw byte steam.
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*
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* This function is inspired by the GNU readline but is an entirely
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* different creature.
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*
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* Input Parameters:
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* buf - The user allocated buffer to be filled.
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* buflen - the size of the buffer.
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*
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* Returned values:
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* On success, the (positive) number of bytes transferred is returned.
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* EOF is returned to indicate either an end of file condition or a
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* failure.
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*
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****************************************************************************/
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#define std_readline(b,s) readline(b,s,stdin,stdout)
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* CONFIG_SYSTEM_READLINE */
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#endif /* __APPS_INCLUDE_SYSTEM_READLINE_H */
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