forked from test34/can_wizard
1390 lines
46 KiB
C
1390 lines
46 KiB
C
/* linenoise.c -- guerrilla line editing library against the idea that a
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* line editing lib needs to be 20,000 lines of C code.
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*
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* You can find the latest source code at:
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*
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* http://github.com/antirez/linenoise
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*
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* Does a number of crazy assumptions that happen to be true in 99.9999% of
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* the 2010 UNIX computers around.
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*
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* ------------------------------------------------------------------------
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*
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* Copyright (c) 2023-2023, Danila Gornushko <d3g3v3 at gmail dot com>
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* Copyright (c) 2010-2023, Salvatore Sanfilippo <antirez at gmail dot com>
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* Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
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*
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* All rights reserved.
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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 are
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* met:
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*
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* * 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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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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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 FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ------------------------------------------------------------------------
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*
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* References:
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* - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
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* - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
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*
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* Todo list:
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* - Filter bogus Ctrl+<char> combinations.
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* - Win32 support
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*
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* Bloat:
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* - History search like Ctrl+r in readline?
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*
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* List of escape sequences used by this program, we do everything just
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* with three sequences. In order to be so cheap we may have some
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* flickering effect with some slow terminal, but the lesser sequences
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* the more compatible.
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*
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* EL (Erase Line)
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* Sequence: ESC [ n K
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* Effect: if n is 0 or missing, clear from cursor to end of line
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* Effect: if n is 1, clear from beginning of line to cursor
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* Effect: if n is 2, clear entire line
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*
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* CUF (CUrsor Forward)
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* Sequence: ESC [ n C
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* Effect: moves cursor forward n chars
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*
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* CUB (CUrsor Backward)
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* Sequence: ESC [ n D
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* Effect: moves cursor backward n chars
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*
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* The following is used to get the terminal width if getting
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* the width with the TIOCGWINSZ ioctl fails
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*
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* DSR (Device Status Report)
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* Sequence: ESC [ 6 n
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* Effect: reports the current cusor position as ESC [ n ; m R
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* where n is the row and m is the column
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*
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* When multi line mode is enabled, we also use an additional escape
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* sequence. However multi line editing is disabled by default.
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*
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* CUU (Cursor Up)
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* Sequence: ESC [ n A
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* Effect: moves cursor up of n chars.
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*
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* CUD (Cursor Down)
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* Sequence: ESC [ n B
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* Effect: moves cursor down of n chars.
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*
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* When linenoiseClearScreen() is called, two additional escape sequences
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* are used in order to clear the screen and position the cursor at home
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* position.
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*
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* CUP (Cursor position)
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* Sequence: ESC [ H
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* Effect: moves the cursor to upper left corner
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*
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* ED (Erase display)
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* Sequence: ESC [ 2 J
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* Effect: clear the whole screen
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*
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*/
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// ReSharper disable CppDefaultCaseNotHandledInSwitchStatement
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/fcntl.h>
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#include <sys/types.h>
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#include "linenoise.h"
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#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
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#define LINENOISE_DEFAULT_MAX_LINE 4096
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#define LINENOISE_MINIMAL_MAX_LINE 64
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#define LINENOISE_COMMAND_MAX_LEN 32
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#define LINENOISE_PASTE_KEY_DELAY 30 /* Delay, in milliseconds, between two characters being pasted from clipboard */
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static linenoiseCompletionCallback *completionCallback = NULL;
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static linenoiseHintsCallback *hintsCallback = NULL;
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static linenoiseFreeHintsCallback *freeHintsCallback = NULL;
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static void refreshLineWithCompletion(struct linenoiseState *ls, const linenoiseCompletions *lc, int flags);
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static void refreshLineWithFlags(struct linenoiseState *l, int flags);
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static int maskmode = 0; /* Show "***" instead of input. For passwords. */
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static size_t max_cmdline_length = LINENOISE_DEFAULT_MAX_LINE;
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static int mlmode = 0; /* Multi line mode. Default is single line. */
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static int dumbmode = 0; /* Dumb mode where line editing is disabled. Off by default */
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static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
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static int history_len = 0;
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static char **history = NULL;
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SemaphoreHandle_t stdout_taken_sem;
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enum KEY_ACTION{
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KEY_NULL = 0, /* NULL */
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CTRL_A = 1, /* Ctrl+a */
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CTRL_B = 2, /* Ctrl-b */
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CTRL_C = 3, /* Ctrl-c */
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CTRL_D = 4, /* Ctrl-d */
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CTRL_E = 5, /* Ctrl-e */
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CTRL_F = 6, /* Ctrl-f */
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CTRL_H = 8, /* Ctrl-h */
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TAB = 9, /* Tab */
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CTRL_K = 11, /* Ctrl+k */
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CTRL_L = 12, /* Ctrl+l */
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ENTER = 10, /* Enter */
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CTRL_N = 14, /* Ctrl-n */
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CTRL_P = 16, /* Ctrl-p */
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CTRL_T = 20, /* Ctrl-t */
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CTRL_U = 21, /* Ctrl+u */
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CTRL_W = 23, /* Ctrl+w */
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ESC = 27, /* Escape */
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BACKSPACE = 127 /* Backspace */
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};
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int linenoiseHistoryAdd(const char *line);
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#define REFRESH_CLEAN (1<<0) // Clean the old prompt from the screen
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#define REFRESH_WRITE (1<<1) // Rewrite the prompt on the screen.
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#define REFRESH_ALL (REFRESH_CLEAN|REFRESH_WRITE) // Do both.
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static void refreshLine(struct linenoiseState *l);
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/* ======================= Low level terminal handling ====================== */
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/* Enable "mask mode". When it is enabled, instead of the input that
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* the user is typing, the terminal will just display a corresponding
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* number of asterisks, like "****". This is useful for passwords and other
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* secrets that should not be displayed. */
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void linenoiseMaskModeEnable(void) {
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maskmode = 1;
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}
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/* Disable mask mode. */
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void linenoiseMaskModeDisable(void) {
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maskmode = 0;
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}
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/* Set if to use or not the multi line mode. */
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void linenoiseSetMultiLine(int ml) {
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mlmode = ml;
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}
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/* Set if terminal does not recognize escape sequences */
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void linenoiseSetDumbMode(int set) {
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dumbmode = set;
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}
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/* Returns whether the current mode is dumbmode or not. */
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bool linenoiseIsDumbMode(void) {
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return dumbmode;
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}
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void flushWrite(void) {
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if (__fbufsize(stdout) > 0) {
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fflush(stdout);
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}
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fsync(fileno(stdout));
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}
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/* Use the ESC [6n escape sequence to query the horizontal cursor position
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* and return it. On error -1 is returned, on success the position of the
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* cursor. */
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static int getCursorPosition(void) {
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char buf[LINENOISE_COMMAND_MAX_LEN] = { 0 };
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int cols = 0;
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int rows = 0;
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int i = 0;
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const int out_fd = fileno(stdout);
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const int in_fd = fileno(stdin);
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/* The following ANSI escape sequence is used to get from the TTY the
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* cursor position. */
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const char get_cursor_cmd[] = "\x1b[6n";
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/* Send the command to the TTY on the other end of the UART.
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* Let's use unistd's write function. Thus, data sent through it are raw
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* reducing the overhead compared to using fputs, fprintf, etc... */
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write(out_fd, get_cursor_cmd, sizeof(get_cursor_cmd));
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/* For USB CDC, it is required to flush the output. */
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flushWrite();
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/* The other end will send its response which format is ESC [ rows ; cols R
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* We don't know exactly how many bytes we have to read, thus, perform a
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* read for each byte.
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* Stop right before the last character of the buffer, to be able to NULL
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* terminate it. */
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while (i < sizeof(buf)-1) {
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/* Keep using unistd's functions. Here, using `read` instead of `fgets`
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* or `fgets` guarantees us that we we can read a byte regardless on
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* whether the sender sent end of line character(s) (CR, CRLF, LF). */
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if (read(in_fd, buf + i, 1) != 1 || buf[i] == 'R') {
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/* If we couldn't read a byte from STDIN or if 'R' was received,
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* the transmission is finished. */
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break;
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}
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/* For some reasons, it is possible that we receive new line character
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* after querying the cursor position on some UART. Let's ignore them,
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* this will not affect the rest of the program. */
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if (buf[i] != '\n') {
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i++;
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}
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}
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/* NULL-terminate the buffer, this is required by `sscanf`. */
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buf[i] = '\0';
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/* Parse the received data to get the position of the cursor. */
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if (buf[0] != ESC || buf[1] != '[' || sscanf(buf+2,"%d;%d",&rows,&cols) != 2) {
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return -1;
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}
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return cols;
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}
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/* Try to get the number of columns in the current terminal, or assume 80
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* if it fails. */
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static int getColumns(void) {
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char seq[LINENOISE_COMMAND_MAX_LEN] = { 0 };
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const int fd = fileno(stdout);
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/* The following ANSI escape sequence is used to tell the TTY to move
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* the cursor to the most-right position. */
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const char move_cursor_right[] = "\x1b[999C";
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const size_t cmd_len = sizeof(move_cursor_right);
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/* This one is used to set the cursor position. */
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const char set_cursor_pos[] = "\x1b[%dD";
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/* Get the initial position so we can restore it later. */
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const int start = getCursorPosition();
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if (start == -1) {
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goto failed;
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}
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/* Send the command to go to right margin. Use `write` function instead of
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* `fwrite` for the same reasons explained in `getCursorPosition()` */
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if (write(fd, move_cursor_right, cmd_len) != cmd_len) {
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goto failed;
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}
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flushWrite();
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/* After sending this command, we can get the new position of the cursor,
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* we'd get the size, in columns, of the opened TTY. */
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const int cols = getCursorPosition();
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if (cols == -1) {
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goto failed;
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}
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/* Restore the position of the cursor back. */
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if (cols > start) {
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/* Generate the move cursor command. */
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const int written = snprintf(seq, LINENOISE_COMMAND_MAX_LEN, set_cursor_pos, cols - start);
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/* If `written` is equal or bigger than LINENOISE_COMMAND_MAX_LEN, it
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* means that the output has been truncated because the size provided
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* is too small. */
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assert (written < LINENOISE_COMMAND_MAX_LEN);
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/* Send the command with `write`, which is not buffered. */
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if (write(fd, seq, written) == -1) {
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/* Can't recover... */
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}
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flushWrite();
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}
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return cols;
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failed:
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return 80;
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}
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/* Clear the screen. Used to handle ctrl+l */
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void linenoiseClearScreen(void) {
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fprintf(stdout,"\x1b[H\x1b[2J");
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flushWrite();
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}
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/* Beep, used for completion when there is nothing to complete or when all
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* the choices were already shown. */
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static void linenoiseBeep(void) {
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fprintf(stdout, "\x7");
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flushWrite();
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}
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/* ============================== Completion ================================ */
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/* Free a list of completion option populated by linenoiseAddCompletion(). */
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static void freeCompletions(const linenoiseCompletions *lc) {
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for (size_t i = 0; i < lc->len; i++)
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// ReSharper disable once CppDFANullDereference
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free(lc->cvec[i]);
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}
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/* Called by completeLine() and linenoiseShow() to render the current
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* edited line with the proposed completion. If the current completion table
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* is already available, it is passed as second argument, otherwise the
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* function will use the callback to obtain it.
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*
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* Flags are the same as refreshLine*(), that is REFRESH_* macros. */
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static void refreshLineWithCompletion(struct linenoiseState *ls, const linenoiseCompletions *lc, int flags) {
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/* Obtain the table of completions if the caller didn't provide one. */
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linenoiseCompletions ctable = { 0, NULL };
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if (lc == NULL) {
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completionCallback(ls->buf,&ctable);
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lc = &ctable;
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}
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/* Show the edited line with completion if possible, or just refresh. */
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if (ls->completion_idx < lc->len) {
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const struct linenoiseState saved = *ls;
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ls->len = ls->pos = strlen(lc->cvec[ls->completion_idx]);
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ls->buf = lc->cvec[ls->completion_idx];
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refreshLineWithFlags(ls,flags);
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ls->len = saved.len;
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ls->pos = saved.pos;
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ls->buf = saved.buf;
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} else {
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refreshLineWithFlags(ls,flags);
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}
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/* Free the completions table if needed. */
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if (lc != &ctable) freeCompletions(&ctable);
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}
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/* This is an helper function for linenoiseEdit*() and is called when the
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* user types the <tab> key in order to complete the string currently in the
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* input.
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*
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* The state of the editing is encapsulated into the pointed linenoiseState
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* structure as described in the structure definition.
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*
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* If the function returns non-zero, the caller should handle the
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* returned value as a byte read from the standard input, and process
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* it as usually: this basically means that the function may return a byte
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* read from the termianl but not processed. Otherwise, if zero is returned,
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* the input was consumed by the completeLine() function to navigate the
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* possible completions, and the caller should read for the next characters
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* from stdin. */
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static int completeLine(struct linenoiseState *ls, int keypressed) {
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linenoiseCompletions lc = { 0, NULL };
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char c = keypressed;
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completionCallback(ls->buf,&lc);
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if (lc.len == 0) {
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linenoiseBeep();
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ls->in_completion = 0;
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} else {
|
|
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switch(c) {
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case 9: /* tab */
|
|
if (ls->in_completion == 0) {
|
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ls->in_completion = 1;
|
|
ls->completion_idx = 0;
|
|
} else {
|
|
ls->completion_idx = (ls->completion_idx+1) % (lc.len+1);
|
|
if (ls->completion_idx == lc.len) linenoiseBeep();
|
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}
|
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c = 0;
|
|
break;
|
|
case 27: /* escape */
|
|
/* Re-show original buffer */
|
|
if (ls->completion_idx < lc.len) refreshLine(ls);
|
|
ls->in_completion = 0;
|
|
c = 0;
|
|
break;
|
|
default:
|
|
/* Update buffer and return */
|
|
if (ls->completion_idx < lc.len) {
|
|
const int nwritten = snprintf(ls->buf, ls->buflen, "%s", lc.cvec[ls->completion_idx]);
|
|
ls->len = ls->pos = nwritten;
|
|
}
|
|
ls->in_completion = 0;
|
|
break;
|
|
}
|
|
|
|
/* Show completion or original buffer */
|
|
if (ls->in_completion && ls->completion_idx < lc.len) {
|
|
refreshLineWithCompletion(ls,&lc,REFRESH_ALL);
|
|
} else {
|
|
refreshLine(ls);
|
|
}
|
|
}
|
|
|
|
freeCompletions(&lc);
|
|
return c; /* Return last read character */
|
|
}
|
|
|
|
/* Register a callback function to be called for tab-completion. */
|
|
void linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn) {
|
|
completionCallback = fn;
|
|
}
|
|
|
|
/* Register a hits function to be called to show hits to the user at the
|
|
* right of the prompt. */
|
|
void linenoiseSetHintsCallback(linenoiseHintsCallback *fn) {
|
|
hintsCallback = fn;
|
|
}
|
|
|
|
/* Register a function to free the hints returned by the hints callback
|
|
* registered with linenoiseSetHintsCallback(). */
|
|
void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *fn) {
|
|
freeHintsCallback = fn;
|
|
}
|
|
|
|
/* This function is used by the callback function registered by the user
|
|
* in order to add completion options given the input string when the
|
|
* user typed <tab>. See the example.c source code for a very easy to
|
|
* understand example. */
|
|
void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) {
|
|
const size_t len = strlen(str);
|
|
|
|
char* copy = malloc(len + 1);
|
|
if (copy == NULL) return;
|
|
memcpy(copy,str,len+1);
|
|
char** cvec = realloc(lc->cvec, sizeof(char*) * (lc->len + 1));
|
|
if (cvec == NULL) {
|
|
free(copy);
|
|
return;
|
|
}
|
|
lc->cvec = cvec;
|
|
lc->cvec[lc->len++] = copy;
|
|
}
|
|
|
|
/* =========================== Line editing ================================= */
|
|
|
|
/* We define a very simple "append buffer" structure, that is an heap
|
|
* allocated string where we can append to. This is useful in order to
|
|
* write all the escape sequences in a buffer and flush them to the standard
|
|
* output in a single call, to avoid flickering effects. */
|
|
struct abuf {
|
|
char *b;
|
|
int len;
|
|
};
|
|
|
|
static void abInit(struct abuf *ab) {
|
|
ab->b = NULL;
|
|
ab->len = 0;
|
|
}
|
|
|
|
static void abAppend(struct abuf *ab, const char *s, int len) {
|
|
char *new = realloc(ab->b,ab->len+len);
|
|
|
|
if (new == NULL) return;
|
|
memcpy(new+ab->len,s,len);
|
|
ab->b = new;
|
|
ab->len += len;
|
|
}
|
|
|
|
static void abFree(const struct abuf *ab) {
|
|
free(ab->b);
|
|
}
|
|
|
|
/* Helper of refreshSingleLine() and refreshMultiLine() to show hints
|
|
* to the right of the prompt. */
|
|
void refreshShowHints(struct abuf *ab, const struct linenoiseState *l, int plen) {
|
|
if (hintsCallback && plen+l->len < l->cols) {
|
|
int color = -1, bold = 0;
|
|
char *hint = hintsCallback(l->buf,&color,&bold);
|
|
if (hint) {
|
|
char seq[64];
|
|
int hintlen = strlen(hint);
|
|
const int hintmaxlen = l->cols-(plen+l->len);
|
|
if (hintlen > hintmaxlen) hintlen = hintmaxlen;
|
|
if (bold == 1 && color == -1) color = 37;
|
|
if (color != -1 || bold != 0)
|
|
snprintf(seq,64,"\033[%d;%dm",bold,color);
|
|
else
|
|
seq[0] = '\0';
|
|
abAppend(ab,seq,strlen(seq));
|
|
abAppend(ab,hint,hintlen);
|
|
if (color != -1 || bold != 0)
|
|
abAppend(ab,"\033[0m",4);
|
|
/* Call the function to free the hint returned. */
|
|
if (freeHintsCallback) freeHintsCallback(hint);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Single line low level line refresh.
|
|
*
|
|
* Rewrite the currently edited line accordingly to the buffer content,
|
|
* cursor position, and number of columns of the terminal.
|
|
*
|
|
* Flags is REFRESH_* macros. The function can just remove the old
|
|
* prompt, just write it, or both. */
|
|
static void refreshSingleLine(const struct linenoiseState *l, int flags) {
|
|
char seq[64];
|
|
const size_t plen = l->plen;
|
|
const char *buf = l->buf;
|
|
size_t len = l->len;
|
|
size_t pos = l->pos;
|
|
struct abuf ab;
|
|
|
|
while((plen+pos) >= l->cols) {
|
|
buf++;
|
|
len--;
|
|
pos--;
|
|
}
|
|
while (plen+len > l->cols) {
|
|
len--;
|
|
}
|
|
|
|
abInit(&ab);
|
|
/* Cursor to left edge */
|
|
snprintf(seq,sizeof(seq),"\r");
|
|
abAppend(&ab,seq,strlen(seq));
|
|
|
|
if (flags & REFRESH_WRITE) {
|
|
/* Write the prompt and the current buffer content */
|
|
abAppend(&ab,l->prompt,strlen(l->prompt));
|
|
if (maskmode == 1) {
|
|
while (len--) abAppend(&ab,"*",1);
|
|
} else {
|
|
abAppend(&ab,buf,len);
|
|
}
|
|
/* Show hits if any. */
|
|
refreshShowHints(&ab,l,plen);
|
|
}
|
|
/* Erase to right */
|
|
snprintf(seq,sizeof(seq),"\x1b[0K");
|
|
abAppend(&ab,seq,strlen(seq));
|
|
|
|
if (flags & REFRESH_WRITE) {
|
|
/* Move cursor to original position. */
|
|
snprintf(seq,sizeof(seq),"\r\x1b[%dC", (int)(pos+plen));
|
|
abAppend(&ab,seq,strlen(seq));
|
|
}
|
|
|
|
if (fwrite(ab.b, ab.len, 1, stdout) == -1) {} /* Can't recover from write error. */
|
|
flushWrite();
|
|
abFree(&ab);
|
|
}
|
|
|
|
/* Multi line low level line refresh.
|
|
*
|
|
* Rewrite the currently edited line accordingly to the buffer content,
|
|
* cursor position, and number of columns of the terminal.
|
|
*
|
|
* Flags is REFRESH_* macros. The function can just remove the old
|
|
* prompt, just write it, or both. */
|
|
static void refreshMultiLine(struct linenoiseState *l, int flags) {
|
|
char seq[64];
|
|
const int plen = l->plen;
|
|
int rows = (plen+l->len+l->cols-1)/l->cols; /* rows used by current buf. */
|
|
const int rpos = (plen+l->oldpos+l->cols)/l->cols; /* cursor relative row. */
|
|
const int old_rows = l->oldrows;
|
|
struct abuf ab;
|
|
|
|
l->oldrows = rows;
|
|
|
|
/* First step: clear all the lines used before. To do so start by
|
|
* going to the last row. */
|
|
abInit(&ab);
|
|
|
|
if (flags & REFRESH_CLEAN) {
|
|
if (old_rows-rpos > 0) {
|
|
snprintf(seq,64,"\x1b[%dB", old_rows-rpos);
|
|
abAppend(&ab,seq,strlen(seq));
|
|
}
|
|
|
|
/* Now for every row clear it, go up. */
|
|
for (int j = 0; j < old_rows-1; j++) {
|
|
snprintf(seq,64,"\r\x1b[0K\x1b[1A");
|
|
abAppend(&ab,seq,strlen(seq));
|
|
}
|
|
}
|
|
|
|
if (flags & REFRESH_ALL) {
|
|
/* Clean the top line. */
|
|
snprintf(seq,64,"\r\x1b[0K");
|
|
abAppend(&ab,seq,strlen(seq));
|
|
}
|
|
|
|
if (flags & REFRESH_WRITE) {
|
|
/* Write the prompt and the current buffer content */
|
|
abAppend(&ab,l->prompt,strlen(l->prompt));
|
|
if (maskmode == 1) {
|
|
for (unsigned int i = 0; i < l->len; i++) abAppend(&ab,"*",1);
|
|
} else {
|
|
abAppend(&ab,l->buf,l->len);
|
|
}
|
|
|
|
/* Show hits if any. */
|
|
refreshShowHints(&ab,l,plen);
|
|
|
|
/* If we are at the very end of the screen with our prompt, we need to
|
|
* emit a newline and move the prompt to the first column. */
|
|
if (l->pos &&
|
|
l->pos == l->len &&
|
|
(l->pos+plen) % l->cols == 0)
|
|
{
|
|
abAppend(&ab,"\n",1);
|
|
snprintf(seq,64,"\r");
|
|
abAppend(&ab,seq,strlen(seq));
|
|
rows++;
|
|
if (rows > (int)l->oldrows) l->oldrows = rows;
|
|
}
|
|
|
|
/* Move cursor to right position. */
|
|
const int rpos2 = (plen + l->pos + l->cols) / l->cols; /* Current cursor relative row */
|
|
|
|
/* Go up till we reach the expected positon. */
|
|
if (rows-rpos2 > 0) {
|
|
snprintf(seq,64,"\x1b[%dA", rows-rpos2);
|
|
abAppend(&ab,seq,strlen(seq));
|
|
}
|
|
|
|
/* Set column. */
|
|
const int col = (plen + (int) l->pos) % (int) l->cols;
|
|
if (col)
|
|
snprintf(seq,64,"\r\x1b[%dC", col);
|
|
else
|
|
snprintf(seq,64,"\r");
|
|
abAppend(&ab,seq,strlen(seq));
|
|
}
|
|
|
|
l->oldpos = l->pos;
|
|
|
|
if (fwrite(ab.b, ab.len, 1, stdout) == -1) {} /* Can't recover from write error. */
|
|
flushWrite();
|
|
abFree(&ab);
|
|
}
|
|
|
|
/* Calls the two low level functions refreshSingleLine() or
|
|
* refreshMultiLine() according to the selected mode. */
|
|
static void refreshLineWithFlags(struct linenoiseState *l, int flags) {
|
|
if (mlmode)
|
|
refreshMultiLine(l,flags);
|
|
else
|
|
refreshSingleLine(l,flags);
|
|
}
|
|
|
|
/* Utility function to avoid specifying REFRESH_ALL all the times. */
|
|
static void refreshLine(struct linenoiseState *l) {
|
|
refreshLineWithFlags(l,REFRESH_ALL);
|
|
}
|
|
|
|
/* Hide the current line, when using the multiplexing API. */
|
|
void linenoiseHide(struct linenoiseState *l) {
|
|
if (mlmode)
|
|
refreshMultiLine(l,REFRESH_CLEAN);
|
|
else
|
|
refreshSingleLine(l,REFRESH_CLEAN);
|
|
}
|
|
|
|
/* Show the current line, when using the multiplexing API. */
|
|
void linenoiseShow(struct linenoiseState *l) {
|
|
if (l->in_completion) {
|
|
refreshLineWithCompletion(l,NULL,REFRESH_WRITE);
|
|
} else {
|
|
refreshLineWithFlags(l,REFRESH_WRITE);
|
|
}
|
|
}
|
|
|
|
/* Insert the character 'c' at cursor current position.
|
|
*
|
|
* On error writing to the terminal -1 is returned, otherwise 0. */
|
|
int linenoiseEditInsert(struct linenoiseState *l, char c) {
|
|
if (l->len < l->buflen) {
|
|
if (l->len == l->pos) {
|
|
l->buf[l->pos] = c;
|
|
l->pos++;
|
|
l->len++;
|
|
l->buf[l->len] = '\0';
|
|
if ((!mlmode && l->plen+l->len < l->cols && !hintsCallback)) {
|
|
/* Avoid a full update of the line in the
|
|
* trivial case. */
|
|
const char d = (maskmode==1) ? '*' : c;
|
|
if (fwrite(&d,1,1,stdout) == -1) return -1;
|
|
flushWrite();
|
|
} else {
|
|
refreshLine(l);
|
|
}
|
|
} else {
|
|
memmove(l->buf+l->pos+1,l->buf+l->pos,l->len-l->pos);
|
|
l->buf[l->pos] = c;
|
|
l->len++;
|
|
l->pos++;
|
|
l->buf[l->len] = '\0';
|
|
refreshLine(l);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int linenoiseInsertPastedChar(struct linenoiseState *l, char c) {
|
|
const int fd = fileno(stdout);
|
|
if (l->len < l->buflen && l->len == l->pos) {
|
|
l->buf[l->pos] = c;
|
|
l->pos++;
|
|
l->len++;
|
|
l->buf[l->len] = '\0';
|
|
if (write(fd, &c,1) == -1) {
|
|
return -1;
|
|
}
|
|
flushWrite();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Move cursor on the left. */
|
|
void linenoiseEditMoveLeft(struct linenoiseState *l) {
|
|
if (l->pos > 0) {
|
|
l->pos--;
|
|
refreshLine(l);
|
|
}
|
|
}
|
|
|
|
/* Move cursor on the right. */
|
|
void linenoiseEditMoveRight(struct linenoiseState *l) {
|
|
if (l->pos != l->len) {
|
|
l->pos++;
|
|
refreshLine(l);
|
|
}
|
|
}
|
|
|
|
/* Move cursor to the start of the line. */
|
|
void linenoiseEditMoveHome(struct linenoiseState *l) {
|
|
if (l->pos != 0) {
|
|
l->pos = 0;
|
|
refreshLine(l);
|
|
}
|
|
}
|
|
|
|
/* Move cursor to the end of the line. */
|
|
void linenoiseEditMoveEnd(struct linenoiseState *l) {
|
|
if (l->pos != l->len) {
|
|
l->pos = l->len;
|
|
refreshLine(l);
|
|
}
|
|
}
|
|
|
|
/* Substitute the currently edited line with the next or previous history
|
|
* entry as specified by 'dir'. */
|
|
#define LINENOISE_HISTORY_NEXT 0
|
|
#define LINENOISE_HISTORY_PREV 1
|
|
void linenoiseEditHistoryNext(struct linenoiseState *l, int dir) {
|
|
if (history_len > 1) {
|
|
/* Update the current history entry before to
|
|
* overwrite it with the next one. */
|
|
free(history[history_len - 1 - l->history_index]);
|
|
history[history_len - 1 - l->history_index] = strdup(l->buf);
|
|
/* Show the new entry */
|
|
l->history_index += (dir == LINENOISE_HISTORY_PREV) ? 1 : -1;
|
|
if (l->history_index < 0) {
|
|
l->history_index = 0;
|
|
return;
|
|
} else if (l->history_index >= history_len) {
|
|
l->history_index = history_len-1;
|
|
return;
|
|
}
|
|
strncpy(l->buf,history[history_len - 1 - l->history_index],l->buflen);
|
|
l->buf[l->buflen-1] = '\0';
|
|
l->len = l->pos = strlen(l->buf);
|
|
refreshLine(l);
|
|
}
|
|
}
|
|
|
|
/* Delete the character at the right of the cursor without altering the cursor
|
|
* position. Basically this is what happens with the "Delete" keyboard key. */
|
|
void linenoiseEditDelete(struct linenoiseState *l) {
|
|
if (l->len > 0 && l->pos < l->len) {
|
|
memmove(l->buf+l->pos,l->buf+l->pos+1,l->len-l->pos-1);
|
|
l->len--;
|
|
l->buf[l->len] = '\0';
|
|
refreshLine(l);
|
|
}
|
|
}
|
|
|
|
/* Backspace implementation. */
|
|
void linenoiseEditBackspace(struct linenoiseState *l) {
|
|
if (l->pos > 0 && l->len > 0) {
|
|
memmove(l->buf+l->pos-1,l->buf+l->pos,l->len-l->pos);
|
|
l->pos--;
|
|
l->len--;
|
|
l->buf[l->len] = '\0';
|
|
refreshLine(l);
|
|
}
|
|
}
|
|
|
|
/* Delete the previosu word, maintaining the cursor at the start of the
|
|
* current word. */
|
|
void linenoiseEditDeletePrevWord(struct linenoiseState *l) {
|
|
const size_t old_pos = l->pos;
|
|
|
|
while (l->pos > 0 && l->buf[l->pos-1] == ' ')
|
|
l->pos--;
|
|
while (l->pos > 0 && l->buf[l->pos - 1] != ' ')
|
|
l->pos--;
|
|
const size_t diff = old_pos - l->pos;
|
|
memmove(l->buf+l->pos,l->buf+old_pos,l->len-old_pos+1);
|
|
l->len -= diff;
|
|
refreshLine(l);
|
|
}
|
|
|
|
// TODO: try to make a non-blocking dumb mode
|
|
static char *linenoiseDumb(struct linenoiseState *l) {
|
|
/* dumb terminal, fall back to fgets */
|
|
// Not needed anymore, prompt is now in linenoiseEditStart
|
|
// fputs(l->prompt, stdout);
|
|
// flushWrite();
|
|
l->len = 0; //needed?
|
|
while (l->len < l->buflen) {
|
|
const int c = fgetc(stdin);
|
|
xSemaphoreTake(stdout_taken_sem, portMAX_DELAY);
|
|
if (c == '\n') {
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
break;
|
|
} else if (c >= 0x1c && c <= 0x1f){
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
continue; /* consume arrow keys */
|
|
} else if (c == BACKSPACE || c == 0x8) {
|
|
if (l->len > 0) {
|
|
l->buf[l->len - 1] = 0;
|
|
l->len --;
|
|
}
|
|
fputs("\x08 ", stdout); /* Windows CMD: erase symbol under cursor */
|
|
flushWrite();
|
|
} else {
|
|
l->buf[l->len] = c;
|
|
l->len++;
|
|
}
|
|
fputc(c, stdout); /* echo */
|
|
flushWrite();
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
}
|
|
xSemaphoreTake(stdout_taken_sem, portMAX_DELAY);
|
|
fputc('\n', stdout);
|
|
flushWrite();
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
// if (l->len == 0) return linenoiseEditMore;
|
|
return strdup(l->buf);
|
|
}
|
|
|
|
uint32_t getMillis(void) {
|
|
struct timeval tv = { 0 };
|
|
gettimeofday(&tv, NULL);
|
|
return tv.tv_sec * 1000 + tv.tv_usec / 1000;
|
|
}
|
|
|
|
/* This function is part of the multiplexed API of Linenoise, that is used
|
|
* in order to implement the blocking variant of the API but can also be
|
|
* called by the user directly in an event driven program. It will:
|
|
*
|
|
* 1. Initialize the linenoise state passed by the user.
|
|
* 2. Put the terminal in RAW mode.
|
|
* 3. Show the prompt.
|
|
* 4. Return control to the user, that will have to call linenoiseEditFeed()
|
|
* each time there is some data arriving in the standard input.
|
|
*
|
|
* The user can also call linenoiseEditHide() and linenoiseEditShow() if it
|
|
* is required to show some input arriving asyncronously, without mixing
|
|
* it with the currently edited line.
|
|
*
|
|
* When linenoiseEditFeed() returns non-NULL, the user finished with the
|
|
* line editing session (pressed enter CTRL-D/C): in this case the caller
|
|
* needs to call linenoiseEditStop() to put back the terminal in normal
|
|
* mode. This will not destroy the buffer, as long as the linenoiseState
|
|
* is still valid in the context of the caller.
|
|
*
|
|
* The function returns 0 on success, or -1 if writing to standard output
|
|
* fails. If stdin_fd or stdout_fd are set to -1, the default is to use
|
|
* STDIN_FILENO and STDOUT_FILENO.
|
|
*/
|
|
int linenoiseEditStart(struct linenoiseState *l) {
|
|
/* Populate the linenoise state that we pass to functions implementing
|
|
* specific editing functionalities. */
|
|
l->in_completion = 0;
|
|
// l->plen = strlen(l->prompt);
|
|
l->oldpos = l->pos = 0;
|
|
l->len = 0;
|
|
l->cols = getColumns();
|
|
l->oldrows = 0;
|
|
l->history_index = 0;
|
|
|
|
/* Buffer starts empty. */
|
|
l->buf[0] = '\0';
|
|
l->buflen--; /* Make sure there is always space for the nulterm */
|
|
|
|
/* The latest history entry is always our current buffer, that
|
|
* initially is just an empty string. */
|
|
xSemaphoreTake(stdout_taken_sem, portMAX_DELAY);
|
|
if (!dumbmode) {
|
|
linenoiseHistoryAdd("");
|
|
// int pos1 = getCursorPosition();
|
|
if (fwrite(l->prompt,l->plen,1,stdout) == -1) {
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return -1;
|
|
}
|
|
flushWrite();
|
|
// int pos2 = getCursorPosition();
|
|
// if (pos1 >= 0 && pos2 >= 0) {
|
|
// l->plen = pos2 - pos1;
|
|
// }
|
|
} else {
|
|
if (fwrite(l->prompt,l->plen,1,stdout) == -1) {
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return -1;
|
|
}
|
|
flushWrite();
|
|
}
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return 0;
|
|
}
|
|
|
|
char *linenoiseEditMore = "If you see this, you are misusing the API: when linenoiseEditFeed() is called, if it returns linenoiseEditMore the user is yet editing the line. See the README file for more information.";
|
|
|
|
/* This function is part of the multiplexed API of linenoise, see the top
|
|
* comment on linenoiseEditStart() for more information. Call this function
|
|
* each time there is some data to read from the standard input file
|
|
* descriptor. In the case of blocking operations, this function can just be
|
|
* called in a loop, and block.
|
|
*
|
|
* The function returns linenoiseEditMore to signal that line editing is still
|
|
* in progress, that is, the user didn't yet pressed enter / CTRL-D. Otherwise
|
|
* the function returns the pointer to the heap-allocated buffer with the
|
|
* edited line, that the user should free with linenoiseFree().
|
|
*
|
|
* On special conditions, NULL is returned and errno is populated:
|
|
*
|
|
* EAGAIN if the user pressed Ctrl-C
|
|
* ENOENT if the user pressed Ctrl-D
|
|
*
|
|
* Some other errno: I/O error.
|
|
*/
|
|
char *linenoiseEditFeed(struct linenoiseState *l) {
|
|
if (dumbmode) return linenoiseDumb(l);
|
|
char c;
|
|
char seq[3];
|
|
|
|
/*
|
|
* To determine whether the user is pasting data or typing itself, we
|
|
* need to calculate how many milliseconds elapsed between two key
|
|
* presses. Indeed, if there is less than LINENOISE_PASTE_KEY_DELAY
|
|
* (typically 30-40ms), then a paste is being performed, else, the
|
|
* user is typing.
|
|
* NOTE: pressing a key down without releasing it will also spend
|
|
* about 40ms (or even more)
|
|
*/
|
|
const uint32_t t1 = getMillis();
|
|
const int nread = fread(&c, 1, 1, stdin);
|
|
if (nread <= 0) return linenoiseEditMore;
|
|
const uint32_t t2 = getMillis();
|
|
xSemaphoreTake(stdout_taken_sem, portMAX_DELAY);
|
|
// FIXME: line printed twice after pasting something that takes more than 1 line
|
|
if ( (t2 - t1) < LINENOISE_PASTE_KEY_DELAY && c != ENTER) {
|
|
/* Pasting data, insert characters without formatting.
|
|
* This can only be performed when the cursor is at the end of the
|
|
* line. */
|
|
if (linenoiseInsertPastedChar(l,c)) {
|
|
errno = EIO;
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return NULL;
|
|
}
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return linenoiseEditMore;
|
|
}
|
|
|
|
/* Only autocomplete when the callback is set. It returns < 0 when
|
|
* there was an error reading from fd. Otherwise it will return the
|
|
* character that should be handled next. */
|
|
if ((l->in_completion || c == 9) && completionCallback != NULL) {
|
|
c = completeLine(l,c);
|
|
/* Return on errors */
|
|
// TODO: how was it supposed to work? c can't be less than 0
|
|
// if (c < 0) return NULL;
|
|
/* Read next character when 0 */
|
|
if (c == 0) {
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return linenoiseEditMore;
|
|
}
|
|
}
|
|
|
|
switch(c) {
|
|
case ENTER: /* enter */
|
|
history_len--;
|
|
free(history[history_len]);
|
|
if (mlmode) linenoiseEditMoveEnd(l);
|
|
if (hintsCallback) {
|
|
/* Force a refresh without hints to leave the previous
|
|
* line as the user typed it after a newline. */
|
|
linenoiseHintsCallback *hc = hintsCallback;
|
|
hintsCallback = NULL;
|
|
refreshLine(l);
|
|
hintsCallback = hc;
|
|
}
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return strdup(l->buf);
|
|
case CTRL_C: /* ctrl-c */
|
|
errno = EAGAIN;
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return NULL;
|
|
case BACKSPACE: /* backspace */
|
|
case 8: /* ctrl-h */
|
|
linenoiseEditBackspace(l);
|
|
break;
|
|
case CTRL_D: /* ctrl-d, remove char at right of cursor, or if the
|
|
line is empty, act as end-of-file. */
|
|
if (l->len > 0) {
|
|
linenoiseEditDelete(l);
|
|
} else {
|
|
history_len--;
|
|
free(history[history_len]);
|
|
errno = ENOENT;
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return NULL;
|
|
}
|
|
break;
|
|
case CTRL_T: /* ctrl-t, swaps current character with previous. */
|
|
if (l->pos > 0 && l->pos < l->len) {
|
|
const int aux = l->buf[l->pos-1];
|
|
l->buf[l->pos-1] = l->buf[l->pos];
|
|
l->buf[l->pos] = aux;
|
|
if (l->pos != l->len-1) l->pos++;
|
|
refreshLine(l);
|
|
}
|
|
break;
|
|
case CTRL_B: /* ctrl-b */
|
|
linenoiseEditMoveLeft(l);
|
|
break;
|
|
case CTRL_F: /* ctrl-f */
|
|
linenoiseEditMoveRight(l);
|
|
break;
|
|
case CTRL_P: /* ctrl-p */
|
|
linenoiseEditHistoryNext(l, LINENOISE_HISTORY_PREV);
|
|
break;
|
|
case CTRL_N: /* ctrl-n */
|
|
linenoiseEditHistoryNext(l, LINENOISE_HISTORY_NEXT);
|
|
break;
|
|
case ESC: /* escape sequence */
|
|
/* Read the next two bytes representing the escape sequence.
|
|
* chars at different times. */
|
|
if (fread(seq, 1, 1, stdin) == -1) break;
|
|
if (fread(seq+1, 1, 1, stdin) == -1) break;
|
|
// or just if (fread(seq, 1, 2, stdin) < 2) break;
|
|
|
|
/* ESC [ sequences. */
|
|
if (seq[0] == '[') {
|
|
if (seq[1] >= '0' && seq[1] <= '9') {
|
|
/* Extended escape, read additional byte. */
|
|
if (fread(seq+2, 1, 1, stdin) == -1) break;
|
|
if (seq[2] == '~') {
|
|
switch(seq[1]) {
|
|
case '3': /* Delete key. */
|
|
linenoiseEditDelete(l);
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
switch(seq[1]) {
|
|
case 'A': /* Up */
|
|
linenoiseEditHistoryNext(l, LINENOISE_HISTORY_PREV);
|
|
break;
|
|
case 'B': /* Down */
|
|
linenoiseEditHistoryNext(l, LINENOISE_HISTORY_NEXT);
|
|
break;
|
|
case 'C': /* Right */
|
|
linenoiseEditMoveRight(l);
|
|
break;
|
|
case 'D': /* Left */
|
|
linenoiseEditMoveLeft(l);
|
|
break;
|
|
case 'H': /* Home */
|
|
linenoiseEditMoveHome(l);
|
|
break;
|
|
case 'F': /* End*/
|
|
linenoiseEditMoveEnd(l);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ESC O sequences. */
|
|
else if (seq[0] == 'O') {
|
|
switch(seq[1]) {
|
|
case 'H': /* Home */
|
|
linenoiseEditMoveHome(l);
|
|
break;
|
|
case 'F': /* End*/
|
|
linenoiseEditMoveEnd(l);
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
if (linenoiseEditInsert(l,c)) {
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return NULL;
|
|
}
|
|
break;
|
|
case CTRL_U: /* Ctrl+u, delete the whole line. */
|
|
l->buf[0] = '\0';
|
|
l->pos = l->len = 0;
|
|
refreshLine(l);
|
|
break;
|
|
case CTRL_K: /* Ctrl+k, delete from current to end of line. */
|
|
l->buf[l->pos] = '\0';
|
|
l->len = l->pos;
|
|
refreshLine(l);
|
|
break;
|
|
case CTRL_A: /* Ctrl+a, go to the start of the line */
|
|
linenoiseEditMoveHome(l);
|
|
break;
|
|
case CTRL_E: /* ctrl+e, go to the end of the line */
|
|
linenoiseEditMoveEnd(l);
|
|
break;
|
|
case CTRL_L: /* ctrl+l, clear screen */
|
|
linenoiseClearScreen();
|
|
refreshLine(l);
|
|
break;
|
|
case CTRL_W: /* ctrl+w, delete previous word */
|
|
linenoiseEditDeletePrevWord(l);
|
|
break;
|
|
}
|
|
flushWrite();
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return linenoiseEditMore;
|
|
}
|
|
|
|
|
|
/* This is part of the multiplexed linenoise API. See linenoiseEditStart()
|
|
* for more information. This function is called when linenoiseEditFeed()
|
|
* returns something different than NULL. At this point the user input
|
|
* is in the buffer, and we can restore the terminal in normal mode. */
|
|
void linenoiseEditStop(struct linenoiseState *l) {
|
|
xSemaphoreTake(stdout_taken_sem, portMAX_DELAY);
|
|
fputc('\n', stdout);
|
|
flushWrite();
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
}
|
|
|
|
/* This just implements a blocking loop for the multiplexed API.
|
|
* In many applications that are not event-drivern, we can just call
|
|
* the blocking linenoise API, wait for the user to complete the editing
|
|
* and return the buffer. */
|
|
static char *linenoiseBlockingEdit(struct linenoiseState *l)
|
|
{
|
|
/* Editing without a buffer is invalid. */
|
|
if (l->buf == NULL) {
|
|
errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
char *res;
|
|
l->buflen = max_cmdline_length;
|
|
linenoiseEditStart(l);
|
|
// ReSharper disable once CppPossiblyErroneousEmptyStatements
|
|
while ((res = linenoiseEditFeed(l)) == linenoiseEditMore);
|
|
linenoiseEditStop(l);
|
|
return res;
|
|
}
|
|
|
|
int linenoiseProbe() {
|
|
xSemaphoreTake(stdout_taken_sem, portMAX_DELAY);
|
|
/* Switch to non-blocking mode */
|
|
const int stdin_fileno = fileno(stdin);
|
|
int flags = fcntl(stdin_fileno, F_GETFL);
|
|
flags |= O_NONBLOCK;
|
|
int res = fcntl(stdin_fileno, F_SETFL, flags);
|
|
if (res != 0) {
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return -1;
|
|
}
|
|
/* Device status request */
|
|
fprintf(stdout, "\x1b[5n");
|
|
flushWrite();
|
|
|
|
/* Try to read response */
|
|
int timeout_ms = 500;
|
|
size_t read_bytes = 0;
|
|
while (timeout_ms > 0 && read_bytes < 4) {
|
|
const int retry_ms = 10;
|
|
// response is ESC[0n or ESC[3n
|
|
usleep(retry_ms * 1000);
|
|
timeout_ms -= retry_ms;
|
|
char c;
|
|
const int cb = read(stdin_fileno, &c, 1);
|
|
if (cb < 0) {
|
|
continue;
|
|
}
|
|
if (read_bytes == 0 && c != '\x1b') {
|
|
/* invalid response */
|
|
break;
|
|
}
|
|
read_bytes += cb;
|
|
}
|
|
/* Restore old mode */
|
|
flags &= ~O_NONBLOCK;
|
|
res = fcntl(stdin_fileno, F_SETFL, flags);
|
|
if (res != 0) {
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return -1;
|
|
}
|
|
if (read_bytes < 4) {
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return -2;
|
|
}
|
|
xSemaphoreGive(stdout_taken_sem);
|
|
return 0;
|
|
}
|
|
|
|
/* The high level function that is the main API of the linenoise library. */
|
|
char *linenoise(const char *prompt, struct linenoiseState **ls_to_pass) {
|
|
struct linenoiseState *l = *ls_to_pass;
|
|
char *buf = calloc(1, max_cmdline_length);
|
|
l->prompt = prompt;
|
|
l->buf = buf;
|
|
char *retval = linenoiseBlockingEdit(l);
|
|
free(buf);
|
|
return retval;
|
|
}
|
|
|
|
/* This is just a wrapper the user may want to call in order to make sure
|
|
* the linenoise returned buffer is freed with the same allocator it was
|
|
* created with. Useful when the main program is using an alternative
|
|
* allocator. */
|
|
void linenoiseFree(void *ptr) {
|
|
if (ptr == linenoiseEditMore) return; // Protect from API misuse.
|
|
free(ptr);
|
|
}
|
|
|
|
/* ================================ History ================================= */
|
|
|
|
void linenoiseHistoryFree() {
|
|
if (history) {
|
|
for (int j = 0; j < history_len; j++) {
|
|
free(history[j]);
|
|
}
|
|
free(history);
|
|
}
|
|
history = NULL;
|
|
}
|
|
|
|
/* This is the API call to add a new entry in the linenoise history.
|
|
* It uses a fixed array of char pointers that are shifted (memmoved)
|
|
* when the history max length is reached in order to remove the older
|
|
* entry and make room for the new one, so it is not exactly suitable for huge
|
|
* histories, but will work well for a few hundred of entries.
|
|
*
|
|
* Using a circular buffer is smarter, but a bit more complex to handle. */
|
|
int linenoiseHistoryAdd(const char *line) {
|
|
|
|
if (history_max_len == 0) return 0;
|
|
|
|
/* Initialization on first call. */
|
|
if (history == NULL) {
|
|
history = malloc(sizeof(char*)*history_max_len);
|
|
if (history == NULL) return 0;
|
|
memset(history,0,(sizeof(char*)*history_max_len));
|
|
}
|
|
|
|
/* Don't add duplicated lines. */
|
|
if (history_len && !strcmp(history[history_len-1], line)) return 0;
|
|
|
|
/* Add an heap allocated copy of the line in the history.
|
|
* If we reached the max length, remove the older line. */
|
|
char* linecopy = strdup(line);
|
|
if (!linecopy) return 0;
|
|
if (history_len == history_max_len) {
|
|
free(history[0]);
|
|
memmove(history,history+1,sizeof(char*)*(history_max_len-1));
|
|
history_len--;
|
|
}
|
|
history[history_len] = linecopy;
|
|
history_len++;
|
|
return 1;
|
|
}
|
|
|
|
/* Set the maximum length for the history. This function can be called even
|
|
* if there is already some history, the function will make sure to retain
|
|
* just the latest 'len' elements if the new history length value is smaller
|
|
* than the amount of items already inside the history. */
|
|
int linenoiseHistorySetMaxLen(int len) {
|
|
|
|
if (len < 1) return 0;
|
|
if (history) {
|
|
int tocopy = history_len;
|
|
|
|
char** new = malloc(sizeof(char*) * len);
|
|
if (new == NULL) return 0;
|
|
|
|
/* If we can't copy everything, free the elements we'll not use. */
|
|
if (len < tocopy) {
|
|
|
|
for (int j = 0; j < tocopy-len; j++) free(history[j]);
|
|
tocopy = len;
|
|
}
|
|
memset(new,0,sizeof(char*)*len);
|
|
memcpy(new,history+(history_len-tocopy), sizeof(char*)*tocopy);
|
|
free(history);
|
|
history = new;
|
|
}
|
|
history_max_len = len;
|
|
if (history_len > history_max_len)
|
|
history_len = history_max_len;
|
|
return 1;
|
|
}
|
|
|
|
/* Save the history in the specified file. On success 0 is returned
|
|
* otherwise -1 is returned. */
|
|
int linenoiseHistorySave(const char *filename) {
|
|
|
|
FILE* fp = fopen(filename, "w");
|
|
if (fp == NULL) return -1;
|
|
for (int j = 0; j < history_len; j++)
|
|
fprintf(fp,"%s\n",history[j]);
|
|
fclose(fp);
|
|
return 0;
|
|
}
|
|
|
|
/* Load the history from the specified file. If the file does not exist
|
|
* zero is returned and no operation is performed.
|
|
*
|
|
* If the file exists and the operation succeeded 0 is returned, otherwise
|
|
* on error -1 is returned. */
|
|
int linenoiseHistoryLoad(const char *filename) {
|
|
FILE *fp = fopen(filename, "r");
|
|
if (fp == NULL) {
|
|
return -1;
|
|
}
|
|
char *buf = calloc(1, max_cmdline_length);
|
|
if (buf == NULL) {
|
|
fclose(fp);
|
|
return -1;
|
|
}
|
|
while (fgets(buf, max_cmdline_length, fp) != NULL) {
|
|
char* p = strchr(buf, '\r');
|
|
if (!p) p = strchr(buf,'\n');
|
|
if (p) *p = '\0';
|
|
linenoiseHistoryAdd(buf);
|
|
}
|
|
free(buf);
|
|
fclose(fp);
|
|
return 0;
|
|
}
|
|
|
|
/* Set line maximum length. If len parameter is smaller than
|
|
* LINENOISE_MINIMAL_MAX_LINE, -1 is returned
|
|
* otherwise 0 is returned. */
|
|
int linenoiseSetMaxLineLen(size_t len) {
|
|
if (len < LINENOISE_MINIMAL_MAX_LINE) {
|
|
return -1;
|
|
}
|
|
max_cmdline_length = len;
|
|
return 0;
|
|
}
|