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Diffstat (limited to 'lib/console/linenoise/linenoise.c')
| -rw-r--r-- | lib/console/linenoise/linenoise.c | 1318 |
1 files changed, 1318 insertions, 0 deletions
diff --git a/lib/console/linenoise/linenoise.c b/lib/console/linenoise/linenoise.c new file mode 100644 index 00000000..221c86c2 --- /dev/null +++ b/lib/console/linenoise/linenoise.c @@ -0,0 +1,1318 @@ +/* linenoise.c -- guerrilla line editing library against the idea that a + * line editing lib needs to be 20,000 lines of C code. + * + * You can find the latest source code at: + * + * http://github.com/antirez/linenoise + * + * Does a number of crazy assumptions that happen to be true in 99.9999% of + * the 2010 UNIX computers around. + * + * ------------------------------------------------------------------------ + * + * Copyright (c) 2010-2016, Salvatore Sanfilippo <antirez at gmail dot com> + * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com> + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * 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. + * + * 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 + * HOLDER 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. + * + * ------------------------------------------------------------------------ + * + * References: + * - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html + * - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html + * + * Todo list: + * - Filter bogus Ctrl+<char> combinations. + * - Win32 support + * + * Bloat: + * - History search like Ctrl+r in readline? + * + * List of escape sequences used by this program, we do everything just + * with three sequences. In order to be so cheap we may have some + * flickering effect with some slow terminal, but the lesser sequences + * the more compatible. + * + * EL (Erase Line) + * Sequence: ESC [ n K + * Effect: if n is 0 or missing, clear from cursor to end of line + * Effect: if n is 1, clear from beginning of line to cursor + * Effect: if n is 2, clear entire line + * + * CUF (CUrsor Forward) + * Sequence: ESC [ n C + * Effect: moves cursor forward n chars + * + * CUB (CUrsor Backward) + * Sequence: ESC [ n D + * Effect: moves cursor backward n chars + * + * The following is used to get the terminal width if getting + * the width with the TIOCGWINSZ ioctl fails + * + * DSR (Device Status Report) + * Sequence: ESC [ 6 n + * Effect: reports the current cusor position as ESC [ n ; m R + * where n is the row and m is the column + * + * When multi line mode is enabled, we also use an additional escape + * sequence. However multi line editing is disabled by default. + * + * CUU (Cursor Up) + * Sequence: ESC [ n A + * Effect: moves cursor up of n chars. + * + * CUD (Cursor Down) + * Sequence: ESC [ n B + * Effect: moves cursor down of n chars. + * + * When linenoiseClearScreen() is called, two additional escape sequences + * are used in order to clear the screen and position the cursor at home + * position. + * + * CUP (Cursor position) + * Sequence: ESC [ H + * Effect: moves the cursor to upper left corner + * + * ED (Erase display) + * Sequence: ESC [ 2 J + * Effect: clear the whole screen + * + */ + +#include <unistd.h> +#include <stdlib.h> +#include <stdio.h> +#include <stdio_ext.h> +#include <errno.h> +#include <string.h> +#include <stdlib.h> +#include <ctype.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/fcntl.h> +#include <unistd.h> +#include <assert.h> +#include "linenoise.h" + +#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100 +#define LINENOISE_DEFAULT_MAX_LINE 4096 +#define LINENOISE_MINIMAL_MAX_LINE 64 +#define LINENOISE_COMMAND_MAX_LEN 32 +#define LINENOISE_PASTE_KEY_DELAY 30 /* Delay, in milliseconds, between two characters being pasted from clipboard */ + +static linenoiseCompletionCallback *completionCallback = NULL; +static linenoiseHintsCallback *hintsCallback = NULL; +static linenoiseFreeHintsCallback *freeHintsCallback = NULL; + +static size_t max_cmdline_length = LINENOISE_DEFAULT_MAX_LINE; +static int mlmode = 0; /* Multi line mode. Default is single line. */ +static int dumbmode = 0; /* Dumb mode where line editing is disabled. Off by default */ +static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN; +static int history_len = 0; +static char **history = NULL; +static bool allow_empty = true; + +/* The linenoiseState structure represents the state during line editing. + * We pass this state to functions implementing specific editing + * functionalities. */ +struct linenoiseState { + char *buf; /* Edited line buffer. */ + size_t buflen; /* Edited line buffer size. */ + const char *prompt; /* Prompt to display. */ + size_t plen; /* Prompt length. */ + size_t pos; /* Current cursor position. */ + size_t oldpos; /* Previous refresh cursor position. */ + size_t len; /* Current edited line length. */ + size_t cols; /* Number of columns in terminal. */ + size_t maxrows; /* Maximum num of rows used so far (multiline mode) */ + int history_index; /* The history index we are currently editing. */ +}; + +enum KEY_ACTION{ + KEY_NULL = 0, /* NULL */ + CTRL_A = 1, /* Ctrl+a */ + CTRL_B = 2, /* Ctrl-b */ + CTRL_C = 3, /* Ctrl-c */ + CTRL_D = 4, /* Ctrl-d */ + CTRL_E = 5, /* Ctrl-e */ + CTRL_F = 6, /* Ctrl-f */ + CTRL_H = 8, /* Ctrl-h */ + TAB = 9, /* Tab */ + CTRL_K = 11, /* Ctrl+k */ + CTRL_L = 12, /* Ctrl+l */ + ENTER = 10, /* Enter */ + CTRL_N = 14, /* Ctrl-n */ + CTRL_P = 16, /* Ctrl-p */ + CTRL_T = 20, /* Ctrl-t */ + CTRL_U = 21, /* Ctrl+u */ + CTRL_W = 23, /* Ctrl+w */ + ESC = 27, /* Escape */ + BACKSPACE = 127 /* Backspace */ +}; + +int linenoiseHistoryAdd(const char *line); +static void refreshLine(struct linenoiseState *l); + +/* Debugging macro. */ +#if 0 +FILE *lndebug_fp = NULL; +#define lndebug(...) \ + do { \ + if (lndebug_fp == NULL) { \ + lndebug_fp = fopen("/tmp/lndebug.txt","a"); \ + fprintf(lndebug_fp, \ + "[%d %d %d] p: %d, rows: %d, rpos: %d, max: %d, oldmax: %d\n", \ + (int)l->len,(int)l->pos,(int)l->oldpos,plen,rows,rpos, \ + (int)l->maxrows,old_rows); \ + } \ + fprintf(lndebug_fp, ", " __VA_ARGS__); \ + fflush(lndebug_fp); \ + } while (0) +#else +#define lndebug(fmt, ...) +#endif + +/* ======================= Low level terminal handling ====================== */ + +/* Set if to use or not the multi line mode. */ +void linenoiseSetMultiLine(int ml) { + mlmode = ml; +} + +/* Set if terminal does not recognize escape sequences */ +void linenoiseSetDumbMode(int set) { + dumbmode = set; +} + +/* Returns whether the current mode is dumbmode or not. */ +bool linenoiseIsDumbMode(void) { + return dumbmode; +} + +static void flushWrite(void) { + if (__fbufsize(stdout) > 0) { + fflush(stdout); + } + fsync(fileno(stdout)); +} + +/* Use the ESC [6n escape sequence to query the horizontal cursor position + * and return it. On error -1 is returned, on success the position of the + * cursor. */ +static int getCursorPosition(void) { + char buf[LINENOISE_COMMAND_MAX_LEN] = { 0 }; + int cols = 0; + int rows = 0; + int i = 0; + const int out_fd = fileno(stdout); + const int in_fd = fileno(stdin); + /* The following ANSI escape sequence is used to get from the TTY the + * cursor position. */ + const char get_cursor_cmd[] = "\x1b[6n"; + + /* Send the command to the TTY on the other end of the UART. + * Let's use unistd's write function. Thus, data sent through it are raw + * reducing the overhead compared to using fputs, fprintf, etc... */ + write(out_fd, get_cursor_cmd, sizeof(get_cursor_cmd)); + + /* For USB CDC, it is required to flush the output. */ + flushWrite(); + + /* The other end will send its response which format is ESC [ rows ; cols R + * We don't know exactly how many bytes we have to read, thus, perform a + * read for each byte. + * Stop right before the last character of the buffer, to be able to NULL + * terminate it. */ + while (i < sizeof(buf)-1) { + /* Keep using unistd's functions. Here, using `read` instead of `fgets` + * or `fgets` guarantees us that we we can read a byte regardless on + * whether the sender sent end of line character(s) (CR, CRLF, LF). */ + if (read(in_fd, buf + i, 1) != 1 || buf[i] == 'R') { + /* If we couldn't read a byte from STDIN or if 'R' was received, + * the transmission is finished. */ + break; + } + + /* For some reasons, it is possible that we receive new line character + * after querying the cursor position on some UART. Let's ignore them, + * this will not affect the rest of the program. */ + if (buf[i] != '\n') { + i++; + } + } + + /* NULL-terminate the buffer, this is required by `sscanf`. */ + buf[i] = '\0'; + + /* Parse the received data to get the position of the cursor. */ + if (buf[0] != ESC || buf[1] != '[' || sscanf(buf+2,"%d;%d",&rows,&cols) != 2) { + return -1; + } + return cols; +} + +/* Try to get the number of columns in the current terminal, or assume 80 + * if it fails. */ +static int getColumns(void) { + int start = 0; + int cols = 0; + int written = 0; + char seq[LINENOISE_COMMAND_MAX_LEN] = { 0 }; + const int fd = fileno(stdout); + + /* The following ANSI escape sequence is used to tell the TTY to move + * the cursor to the most-right position. */ + const char move_cursor_right[] = "\x1b[999C"; + const size_t cmd_len = sizeof(move_cursor_right); + + /* This one is used to set the cursor position. */ + const char set_cursor_pos[] = "\x1b[%dD"; + + /* Get the initial position so we can restore it later. */ + start = getCursorPosition(); + if (start == -1) { + goto failed; + } + + /* Send the command to go to right margin. Use `write` function instead of + * `fwrite` for the same reasons explained in `getCursorPosition()` */ + if (write(fd, move_cursor_right, cmd_len) != cmd_len) { + goto failed; + } + flushWrite(); + + /* After sending this command, we can get the new position of the cursor, + * we'd get the size, in columns, of the opened TTY. */ + cols = getCursorPosition(); + if (cols == -1) { + goto failed; + } + + /* Restore the position of the cursor back. */ + if (cols > start) { + /* Generate the move cursor command. */ + written = snprintf(seq, LINENOISE_COMMAND_MAX_LEN, set_cursor_pos, cols-start); + + /* If `written` is equal or bigger than LINENOISE_COMMAND_MAX_LEN, it + * means that the output has been truncated because the size provided + * is too small. */ + assert (written < LINENOISE_COMMAND_MAX_LEN); + + /* Send the command with `write`, which is not buffered. */ + if (write(fd, seq, written) == -1) { + /* Can't recover... */ + } + flushWrite(); + } + return cols; + +failed: + return 80; +} + +/* Clear the screen. Used to handle ctrl+l */ +void linenoiseClearScreen(void) { + fprintf(stdout,"\x1b[H\x1b[2J"); + flushWrite(); +} + +/* Beep, used for completion when there is nothing to complete or when all + * the choices were already shown. */ +static void linenoiseBeep(void) { + fprintf(stdout, "\x7"); + flushWrite(); +} + +/* ============================== Completion ================================ */ + +/* Free a list of completion option populated by linenoiseAddCompletion(). */ +static void freeCompletions(linenoiseCompletions *lc) { + size_t i; + for (i = 0; i < lc->len; i++) + free(lc->cvec[i]); + if (lc->cvec != NULL) + free(lc->cvec); +} + +/* This is an helper function for linenoiseEdit() and is called when the + * user types the <tab> key in order to complete the string currently in the + * input. + * + * The state of the editing is encapsulated into the pointed linenoiseState + * structure as described in the structure definition. */ +static int completeLine(struct linenoiseState *ls) { + linenoiseCompletions lc = { 0, NULL }; + int nread, nwritten; + char c = 0; + int in_fd = fileno(stdin); + + completionCallback(ls->buf,&lc); + if (lc.len == 0) { + linenoiseBeep(); + } else { + size_t stop = 0, i = 0; + + while(!stop) { + /* Show completion or original buffer */ + if (i < lc.len) { + struct linenoiseState saved = *ls; + + ls->len = ls->pos = strlen(lc.cvec[i]); + ls->buf = lc.cvec[i]; + refreshLine(ls); + ls->len = saved.len; + ls->pos = saved.pos; + ls->buf = saved.buf; + } else { + refreshLine(ls); + } + + nread = read(in_fd, &c, 1); + if (nread <= 0) { + freeCompletions(&lc); + return -1; + } + + switch(c) { + case TAB: /* tab */ + i = (i+1) % (lc.len+1); + if (i == lc.len) linenoiseBeep(); + break; + case ESC: /* escape */ + /* Re-show original buffer */ + if (i < lc.len) refreshLine(ls); + stop = 1; + break; + default: + /* Update buffer and return */ + if (i < lc.len) { + nwritten = snprintf(ls->buf,ls->buflen,"%s",lc.cvec[i]); + ls->len = ls->pos = nwritten; + } + stop = 1; + break; + } + } + } + + 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) { + size_t len = strlen(str); + char *copy, **cvec; + + copy = malloc(len+1); + if (copy == NULL) return; + memcpy(copy,str,len+1); + 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(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, struct linenoiseState *l, int plen) { + char seq[64]; + if (hintsCallback && plen+l->len < l->cols) { + int color = -1, bold = 0; + char *hint = hintsCallback(l->buf,&color,&bold); + if (hint) { + int hintlen = strlen(hint); + 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;%d;49m",bold,color); + 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. */ +static void refreshSingleLine(struct linenoiseState *l) { + char seq[64]; + size_t plen = l->plen; + int fd = fileno(stdout); + 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,64,"\r"); + abAppend(&ab,seq,strlen(seq)); + /* Write the prompt and the current buffer content */ + abAppend(&ab,l->prompt,strlen(l->prompt)); + abAppend(&ab,buf,len); + /* Show hits if any. */ + refreshShowHints(&ab,l,plen); + /* Erase to right */ + snprintf(seq,64,"\x1b[0K"); + abAppend(&ab,seq,strlen(seq)); + /* Move cursor to original position. */ + snprintf(seq,64,"\r\x1b[%dC", (int)(pos+plen)); + abAppend(&ab,seq,strlen(seq)); + if (write(fd, ab.b, ab.len) == -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. */ +static void refreshMultiLine(struct linenoiseState *l) { + char seq[64]; + int plen = l->plen; + int rows = (plen+l->len+l->cols-1)/l->cols; /* rows used by current buf. */ + int rpos = (plen+l->oldpos+l->cols)/l->cols; /* cursor relative row. */ + int rpos2; /* rpos after refresh. */ + int col; /* colum position, zero-based. */ + int old_rows = l->maxrows; + int j; + int fd = fileno(stdout); + struct abuf ab; + + /* Update maxrows if needed. */ + if (rows > (int)l->maxrows) l->maxrows = rows; + + /* First step: clear all the lines used before. To do so start by + * going to the last row. */ + abInit(&ab); + if (old_rows-rpos > 0) { + lndebug("go down %d", old_rows-rpos); + snprintf(seq,64,"\x1b[%dB", old_rows-rpos); + abAppend(&ab,seq,strlen(seq)); + } + + /* Now for every row clear it, go up. */ + for (j = 0; j < old_rows-1; j++) { + lndebug("clear+up"); + snprintf(seq,64,"\r\x1b[0K\x1b[1A"); + abAppend(&ab,seq,strlen(seq)); + } + + /* Clean the top line. */ + lndebug("clear"); + snprintf(seq,64,"\r\x1b[0K"); + abAppend(&ab,seq,strlen(seq)); + + /* Write the prompt and the current buffer content */ + abAppend(&ab,l->prompt,strlen(l->prompt)); + 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) + { + lndebug("<newline>"); + abAppend(&ab,"\n",1); + snprintf(seq,64,"\r"); + abAppend(&ab,seq,strlen(seq)); + rows++; + if (rows > (int)l->maxrows) l->maxrows = rows; + } + + /* Move cursor to right position. */ + rpos2 = (plen+l->pos+l->cols)/l->cols; /* current cursor relative row. */ + lndebug("rpos2 %d", rpos2); + + /* Go up till we reach the expected positon. */ + if (rows-rpos2 > 0) { + lndebug("go-up %d", rows-rpos2); + snprintf(seq,64,"\x1b[%dA", rows-rpos2); + abAppend(&ab,seq,strlen(seq)); + } + + /* Set column. */ + col = (plen+(int)l->pos) % (int)l->cols; + lndebug("set col %d", 1+col); + if (col) + snprintf(seq,64,"\r\x1b[%dC", col); + else + snprintf(seq,64,"\r"); + abAppend(&ab,seq,strlen(seq)); + + lndebug("\n"); + l->oldpos = l->pos; + + if (write(fd,ab.b,ab.len) == -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 refreshLine(struct linenoiseState *l) { + if (mlmode) + refreshMultiLine(l); + else + refreshSingleLine(l); +} + +/* 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) { + int fd = fileno(stdout); + 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. */ + if (write(fd, &c,1) == -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) { + 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) { + size_t old_pos = l->pos; + size_t diff; + + while (l->pos > 0 && l->buf[l->pos-1] == ' ') + l->pos--; + while (l->pos > 0 && l->buf[l->pos-1] != ' ') + l->pos--; + diff = old_pos - l->pos; + memmove(l->buf+l->pos,l->buf+old_pos,l->len-old_pos+1); + l->len -= diff; + refreshLine(l); +} + +uint32_t getMillis(void) { + struct timeval tv = { 0 }; + gettimeofday(&tv, NULL); + return tv.tv_sec * 1000 + tv.tv_usec / 1000; +} + +static inline size_t prompt_len_ignore_escape_seq(const char *prompt) { + size_t plen = 0; + bool in_escape_sequence = false; + + for (; *prompt != '\0'; ++prompt) { + if (*prompt == '\033') { + in_escape_sequence = true; + } else if (in_escape_sequence && *prompt == 'm') { + in_escape_sequence = false; + } else if (!in_escape_sequence) { + ++plen; + } + } + + return plen; +} + +/* This function is the core of the line editing capability of linenoise. + * It expects 'fd' to be already in "raw mode" so that every key pressed + * will be returned ASAP to read(). + * + * The resulting string is put into 'buf' when the user type enter, or + * when ctrl+d is typed. + * + * The function returns the length of the current buffer. */ +static int linenoiseEdit(char *buf, size_t buflen, const char *prompt) +{ + uint32_t t1 = 0; + struct linenoiseState l; + int out_fd = fileno(stdout); + int in_fd = fileno(stdin); + + /* Populate the linenoise state that we pass to functions implementing + * specific editing functionalities. */ + l.buf = buf; + l.buflen = buflen; + l.prompt = prompt; + l.plen = strlen(prompt); + l.oldpos = l.pos = 0; + l.len = 0; + l.cols = getColumns(); + l.maxrows = 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. */ + linenoiseHistoryAdd(""); + + if (write(out_fd, prompt,l.plen) == -1) { + return -1; + } + flushWrite(); + + /* If the prompt has been registered with ANSI escape sequences + * for terminal colors then we remove them from the prompt length + * calculation. */ + l.plen = prompt_len_ignore_escape_seq(prompt); + + while(1) { + char c; + int nread; + 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) + */ + t1 = getMillis(); + nread = read(in_fd, &c, 1); + if (nread <= 0) return l.len; + + if ( (getMillis() - 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)) { + return -1; + } + continue; + } + + /* 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 (c == 9 && completionCallback != NULL) { + int c2 = completeLine(&l); + /* Return on errors */ + if (c2 < 0) return l.len; + /* Read next character when 0 */ + if (c2 == 0) continue; + c = c2; + } + + 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; + } + return (int)l.len; + case CTRL_C: /* ctrl-c */ + errno = EAGAIN; + return -1; + 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]); + return -1; + } + break; + case CTRL_T: /* ctrl-t, swaps current character with previous. */ + if (l.pos > 0 && l.pos < l.len) { + int aux = buf[l.pos-1]; + buf[l.pos-1] = buf[l.pos]; + 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. */ + if (read(in_fd, seq, 2) < 2) { + break; + } + + /* ESC [ sequences. */ + if (seq[0] == '[') { + if (seq[1] >= '0' && seq[1] <= '9') { + /* Extended escape, read additional byte. */ + if (read(in_fd, seq+2, 1) == -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)) return -1; + break; + case CTRL_U: /* Ctrl+u, delete the whole line. */ + buf[0] = '\0'; + l.pos = l.len = 0; + refreshLine(&l); + break; + case CTRL_K: /* Ctrl+k, delete from current to end of line. */ + 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(); + } + return l.len; +} + +void linenoiseAllowEmpty(bool val) { + allow_empty = val; +} + +int linenoiseProbe(void) { + /* Switch to non-blocking mode */ + 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) { + return -1; + } + /* Device status request */ + fprintf(stdout, "\x1b[5n"); + flushWrite(); + + /* Try to read response */ + int timeout_ms = 500; + const int retry_ms = 10; + size_t read_bytes = 0; + while (timeout_ms > 0 && read_bytes < 4) { // response is ESC[0n or ESC[3n + usleep(retry_ms * 1000); + timeout_ms -= retry_ms; + char c; + 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) { + return -1; + } + if (read_bytes < 4) { + return -2; + } + return 0; +} + +static int linenoiseRaw(char *buf, size_t buflen, const char *prompt) { + int count; + + if (buflen == 0) { + errno = EINVAL; + return -1; + } + + count = linenoiseEdit(buf, buflen, prompt); + fputc('\n', stdout); + flushWrite(); + return count; +} + +static int linenoiseDumb(char* buf, size_t buflen, const char* prompt) { + /* dumb terminal, fall back to fgets */ + fputs(prompt, stdout); + flushWrite(); + size_t count = 0; + while (count < buflen) { + int c = fgetc(stdin); + if (c == '\n') { + break; + } else if (c >= 0x1c && c <= 0x1f){ + continue; /* consume arrow keys */ + } else if (c == BACKSPACE || c == 0x8) { + if (count > 0) { + buf[count - 1] = 0; + count --; + } + fputs("\x08 ", stdout); /* Windows CMD: erase symbol under cursor */ + flushWrite(); + } else { + buf[count] = c; + ++count; + } + fputc(c, stdout); /* echo */ + flushWrite(); + } + fputc('\n', stdout); + flushWrite(); + return count; +} + +static void sanitize(char* src) { + char* dst = src; + for (int c = *src; c != 0; src++, c = *src) { + if (isprint(c)) { + *dst = c; + ++dst; + } + } + *dst = 0; +} + +/* The high level function that is the main API of the linenoise library. */ +char *linenoise(const char *prompt) { + char *buf = calloc(1, max_cmdline_length); + int count = 0; + if (buf == NULL) { + return NULL; + } + if (!dumbmode) { + count = linenoiseRaw(buf, max_cmdline_length, prompt); + } else { + count = linenoiseDumb(buf, max_cmdline_length, prompt); + } + if (count > 0) { + sanitize(buf); + count = strlen(buf); + } else if (count == 0 && allow_empty) { + /* will return an empty (0-length) string */ + } else { + free(buf); + return NULL; + } + return buf; +} + +/* 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) { + free(ptr); +} + +/* ================================ History ================================= */ + +void linenoiseHistoryFree(void) { + 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) { + char *linecopy; + + 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. */ + 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) { + char **new; + + if (len < 1) return 0; + if (history) { + int tocopy = history_len; + + 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) { + int j; + + for (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; + int j; + + fp = fopen(filename,"w"); + if (fp == NULL) return -1; + for (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; + + 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; +} |