/**************************************************************************** * apps/include/system/readline.h * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ #ifndef __APPS_INCLUDE_SYSTEM_READLINE_H #define __APPS_INCLUDE_SYSTEM_READLINE_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #ifdef CONFIG_SYSTEM_READLINE /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Tab completion cannot be supported if there is no console echo */ #ifndef CONFIG_READLINE_ECHO # undef CONFIG_READLINE_TABCOMPLETION #endif /* Make sure that the are valid values for all tab-completion settings */ #ifdef CONFIG_READLINE_TABCOMPLETION # ifndef CONFIG_READLINE_MAX_BUILTINS # define CONFIG_READLINE_MAX_BUILTINS 64 # endif # ifndef CONFIG_READLINE_MAX_EXTCMDS # define CONFIG_READLINE_MAX_EXTCMDS 64 # endif #endif /**************************************************************************** * Public Types ****************************************************************************/ #if defined(CONFIG_READLINE_TABCOMPLETION) && \ defined(CONFIG_READLINE_HAVE_EXTMATCH) struct extmatch_vtable_s { CODE int (*count_matches)(FAR char *name, FAR int *matches, int namelen); CODE FAR const char *(*getname)(int index); }; #endif /**************************************************************************** * Public Data ****************************************************************************/ #ifdef __cplusplus #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /**************************************************************************** * Name: readline_prompt * * If a prompt string is used by the application, then the application * must provide the prompt string to readline() by calling this function. * This is needed only for tab completion in cases where is it necessary * to reprint the prompt string. * * Input Parameters: * prompt - The prompt string. This function may then be * called with that value in order to restore the previous vtable. * * Returned values: * Returns the previous value of the prompt string. This function may * then be called with that value in order to restore the previous prompt. * * Assumptions: * The prompt string is statically allocated a global. readline() will * simply remember the pointer to the string. The string must stay * allocated and available. Only one prompt string is supported. If * there are multiple clients of readline(), they must all share the same * prompt string (with exceptions in the case of the kernel build). * ****************************************************************************/ #ifdef CONFIG_READLINE_TABCOMPLETION FAR const char *readline_prompt(FAR const char *prompt); #else # define readline_prompt(p) #endif /**************************************************************************** * Name: readline_extmatch * * If the applications supports a command set, then it may call this * function in order to provide support for tab complete on these * "external" commands * * Input Parameters: * vtbl - Callbacks to access the external names. * * Returned values: * Returns the previous vtable pointer. This function may then be * called with that value in order to restore the previous vtable. * * Assumptions: * The vtbl string is statically allocated a global. readline() will * simply remember the pointer to the structure. The structure must stay * allocated and available. Only one instance of such a structure is * supported. If there are multiple clients of readline(), they must all * share the same tab-completion logic (with exceptions in the case of * the kernel build). * ****************************************************************************/ #if defined(CONFIG_READLINE_TABCOMPLETION) && \ defined(CONFIG_READLINE_HAVE_EXTMATCH) FAR const struct extmatch_vtable_s * readline_extmatch(FAR const struct extmatch_vtable_s *vtbl); #endif /**************************************************************************** * Name: readline_fd * * readline_fd() reads in at most one less than 'buflen' characters from * 'infd' and stores them into the buffer pointed to by 'buf'. * Characters are echoed on 'outfd'. 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 readline_fd assumes that we are reading and writing to * a VT100 console. This will not work well if 'infd' or 'outfd' * 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. * infd - The file to read characters from * outfd - The file 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 readline_fd(FAR char *buf, int buflen, int infd, int outfd); /**************************************************************************** * Name: readline * * readline() is same to readline_fd() but accept a file stream instead * of a file handle. * ****************************************************************************/ #ifdef CONFIG_FILE_STREAM ssize_t readline(FAR char *buf, int buflen, FILE *instream, FILE *outstream); #endif /**************************************************************************** * Name: std_readline * * readline() reads in at most one less than 'buflen' characters from * 'stdin' and stores them into the buffer pointed to by 'buf'. * Characters are echoed on 'stdout'. 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 'stdin' or 'stdout' * 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. * * 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. * ****************************************************************************/ #define std_readline(b,s) readline(b,s,stdin,stdout) #undef EXTERN #ifdef __cplusplus } #endif #endif /* CONFIG_SYSTEM_READLINE */ #endif /* __APPS_INCLUDE_SYSTEM_READLINE_H */