| /* linenoise.c -- VERSION 1.0 |
| * |
| * 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) 2010-2014, 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 <termios.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <ctype.h> |
| #include <dirent.h> |
| #include <sys/types.h> |
| #include <sys/ioctl.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| #include "linenoise.h" |
| |
| #define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100 |
| #define LINENOISE_MAX_LINE 4096 |
| static char *unsupported_term[] = {"dumb","cons25","emacs",NULL}; |
| static linenoiseCompletionCallback *completionCallback = NULL; |
| |
| static struct termios orig_termios; /* In order to restore at exit.*/ |
| static int mlmode = 0; /* Multi line mode. Default is single line. */ |
| static int atexit_registered = 0; /* Register atexit just 1 time. */ |
| static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN; |
| static int history_len = 0; |
| static char **history = NULL; |
| |
| /* The linenoiseState structure represents the state during line editing. |
| * We pass this state to functions implementing specific editing |
| * functionalities. */ |
| struct linenoiseState ls; |
| |
| 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 = 13, /* 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 */ |
| }; |
| |
| static void linenoiseAtExit(void); |
| int linenoiseHistoryAdd(const char *line); |
| |
| /* 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; |
| } |
| |
| /* Return true if the terminal name is in the list of terminals we know are |
| * not able to understand basic escape sequences. */ |
| static int isUnsupportedTerm(void) { |
| char *term = getenv("TERM"); |
| int j; |
| |
| if (term == NULL) return 0; |
| for (j = 0; unsupported_term[j]; j++) |
| if (!strcasecmp(term,unsupported_term[j])) return 1; |
| return 0; |
| } |
| |
| /* Raw mode: 1960 magic shit. */ |
| int linenoiseEnableRawMode(int fd) { |
| struct termios raw; |
| |
| if (!isatty(STDIN_FILENO)) goto fatal; |
| if (!atexit_registered) { |
| atexit(linenoiseAtExit); |
| atexit_registered = 1; |
| } |
| if (tcgetattr(fd,&orig_termios) == -1) goto fatal; |
| |
| raw = orig_termios; /* modify the original mode */ |
| /* input modes: no break, no CR to NL, no parity check, no strip char, |
| * no start/stop output control. */ |
| raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON); |
| /* output modes - disable post processing */ |
| raw.c_oflag &= ~(OPOST); |
| /* control modes - set 8 bit chars */ |
| raw.c_cflag |= (CS8); |
| /* local modes - choing off, canonical off, no extended functions, |
| * no signal chars (^Z,^C) */ |
| raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG); |
| /* control chars - set return condition: min number of bytes and timer. |
| * We want read to return every single byte, without timeout. */ |
| raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */ |
| |
| /* put terminal in raw mode after flushing */ |
| if (tcsetattr(fd,TCSAFLUSH,&raw) < 0) goto fatal; |
| ls.rawmode = 1; |
| return 0; |
| |
| fatal: |
| errno = ENOTTY; |
| return -1; |
| } |
| |
| void linenoiseDisableRawMode(int fd) { |
| /* Don't even check the return value as it's too late. */ |
| if (ls.rawmode && tcsetattr(fd,TCSAFLUSH,&orig_termios) != -1) |
| ls.rawmode = 0; |
| } |
| |
| /* 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(int ifd, int ofd) { |
| char buf[32]; |
| int cols, rows; |
| unsigned int i = 0; |
| |
| /* Report cursor location */ |
| if (write(ofd, "\x1b[6n", 4) != 4) return -1; |
| |
| /* Read the response: ESC [ rows ; cols R */ |
| while (i < sizeof(buf)-1) { |
| if (read(ifd,buf+i,1) != 1) break; |
| if (buf[i] == 'R') break; |
| i++; |
| } |
| buf[i] = '\0'; |
| |
| /* Parse it. */ |
| if (buf[0] != ESC || buf[1] != '[') return -1; |
| if (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(int ifd, int ofd) { |
| struct winsize ws; |
| |
| if (ioctl(1, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) { |
| /* ioctl() failed. Try to query the terminal itself. */ |
| int start, cols; |
| |
| /* Get the initial position so we can restore it later. */ |
| start = getCursorPosition(ifd,ofd); |
| if (start == -1) goto failed; |
| |
| /* Go to right margin and get position. */ |
| if (write(ofd,"\x1b[999C",6) != 6) goto failed; |
| cols = getCursorPosition(ifd,ofd); |
| if (cols == -1) goto failed; |
| |
| /* Restore position. */ |
| if (cols > start) { |
| char seq[32]; |
| snprintf(seq,32,"\x1b[%dD",cols-start); |
| if (write(ofd,seq,strlen(seq)) == -1) { |
| /* Can't recover... */ |
| } |
| } |
| return cols; |
| } else { |
| return ws.ws_col; |
| } |
| |
| failed: |
| return 80; |
| } |
| |
| /* Clear the screen. Used to handle ctrl+l */ |
| void linenoiseClearScreen(void) { |
| if (write(STDOUT_FILENO,"\x1b[H\x1b[2J",7) <= 0) { |
| /* nothing to do, just to avoid warning. */ |
| } |
| } |
| |
| /* Beep, used for completion when there is nothing to complete or when all |
| * the choices were already shown. */ |
| static void linenoiseBeep(void) { |
| fprintf(stderr, "\x7"); |
| fflush(stderr); |
| } |
| |
| /* ============================== 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, 0, NULL}; |
| int nread, nwritten, hint_len, hint_line_count, char_count; |
| char c = 0, *common, *hint; |
| struct winsize w; |
| |
| /* Hint is only the string after the last space */ |
| hint = strrchr(ls->buf, ' '); |
| if (!hint) { |
| hint = ls->buf; |
| } else { |
| ++hint; |
| } |
| |
| completionCallback(ls->buf, hint, &lc); |
| if (lc.len == 0) { |
| linenoiseBeep(); |
| } else { |
| unsigned int i, j; |
| |
| /* Learn the longest common part */ |
| common = strdup(lc.cvec[0]); |
| for (i = 1; i < lc.len; ++i) { |
| for (j = 0; j < strlen(lc.cvec[i]); ++j) { |
| if (lc.cvec[i][j] != common[j]) { |
| break; |
| } |
| } |
| common[j] = '\0'; |
| } |
| |
| /* Path completions have a different hint */ |
| if (lc.path && strrchr(hint, '/')) { |
| hint = strrchr(hint, '/'); |
| ++hint; |
| } |
| |
| /* Show completion */ |
| if ((lc.len == 1) && (common[strlen(common) - 1] != '/')) { |
| nwritten = snprintf(hint, ls->buflen - (hint - ls->buf), "%s ", common); |
| } else { |
| nwritten = snprintf(hint, ls->buflen - (hint - ls->buf), "%s", common); |
| } |
| free(common); |
| ls->len = ls->pos = (hint - ls->buf) + nwritten; |
| linenoiseRefreshLine(); |
| |
| /* A single hint */ |
| if (lc.len == 1) { |
| freeCompletions(&lc); |
| return 0; |
| } |
| |
| /* Read a char */ |
| nread = read(ls->ifd,&c,1); |
| if (nread <= 0) { |
| freeCompletions(&lc); |
| return -1; |
| } |
| |
| /* Not a tab */ |
| if (c != 9) { |
| freeCompletions(&lc); |
| return c; |
| } |
| |
| /* Learn terminal window size */ |
| ioctl(ls->ifd, TIOCGWINSZ, &w); |
| |
| /* Learn the longest hint */ |
| hint_len = strlen(lc.cvec[0]); |
| for (i = 1; i < lc.len; ++i) { |
| if (strlen(lc.cvec[i]) > (unsigned)hint_len) { |
| hint_len = strlen(lc.cvec[i]); |
| } |
| } |
| |
| /* Learn the number of hints that fit a line */ |
| hint_line_count = 0; |
| while (1) { |
| char_count = 0; |
| if (hint_line_count) { |
| char_count += hint_line_count * (hint_len + 2); |
| } |
| char_count += hint_len; |
| |
| /* Too much */ |
| if (char_count > w.ws_col) { |
| break; |
| } |
| |
| /* Still fits */ |
| ++hint_line_count; |
| } |
| |
| /* No hint fits, too bad */ |
| if (!hint_line_count) { |
| freeCompletions(&lc); |
| return c; |
| } |
| |
| while (c == 9) { |
| /* Second tab */ |
| linenoiseDisableRawMode(ls->ifd); |
| printf("\n"); |
| for (i = 0; i < lc.len; ++i) { |
| printf("%-*s", hint_len, lc.cvec[i]); |
| /* Line full or last hint */ |
| if (((i + 1) % hint_line_count == 0) || (i == lc.len - 1)) { |
| printf("\n"); |
| } else { |
| printf(" "); |
| } |
| } |
| linenoiseEnableRawMode(ls->ifd); |
| linenoiseRefreshLine(); |
| |
| /* Read a char */ |
| nread = read(ls->ifd,&c,1); |
| if (nread <= 0) { |
| freeCompletions(&lc); |
| return -1; |
| } |
| } |
| } |
| |
| freeCompletions(&lc); |
| return c; /* Return last read character */ |
| } |
| |
| /* Register a callback function to be called for tab-completion. */ |
| void linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn) { |
| completionCallback = fn; |
| } |
| |
| /* This function can be called in user completion callback to fill |
| * path completion for them. hint parameter is actually the whole path |
| * and buf is unused, but included to match the completion callback prototype. */ |
| void linenoisePathCompletion(const char *buf, const char *hint, linenoiseCompletions *lc) { |
| const char *ptr; |
| char *full_path, *hint_ptr, match[FILENAME_MAX + 2]; |
| DIR *dir; |
| struct dirent *ent; |
| struct stat st; |
| |
| (void)buf; |
| |
| lc->path = 1; |
| |
| ptr = strrchr(hint, '/'); |
| |
| /* new relative path */ |
| if (ptr == NULL) { |
| full_path = malloc(2 + FILENAME_MAX + 1); |
| strcpy(full_path, "./"); |
| |
| ptr = hint; |
| } else { |
| full_path = malloc((int)(ptr - hint) + FILENAME_MAX + 1); |
| ++ptr; |
| sprintf(full_path, "%.*s", (int)(ptr - hint), hint); |
| } |
| hint_ptr = full_path + strlen(full_path); |
| |
| dir = opendir(full_path); |
| if (dir == NULL) { |
| free(full_path); |
| return; |
| } |
| |
| while ((ent = readdir(dir))) { |
| if (ent->d_name[0] == '.') { |
| continue; |
| } |
| |
| if (!strncmp(ptr, ent->d_name, strlen(ptr))) { |
| /* is it a directory? */ |
| strcpy(hint_ptr, ent->d_name); |
| if (stat(full_path, &st)) { |
| /* skip this item */ |
| continue; |
| } |
| |
| strcpy(match, ent->d_name); |
| if (S_ISDIR(st.st_mode)) { |
| strcat(match, "/"); |
| } |
| |
| linenoiseAddCompletion(lc, match); |
| } |
| } |
| |
| free(full_path); |
| closedir(dir); |
| } |
| |
| /* 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); |
| } |
| |
| /* 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 = strlen(l->prompt); |
| int fd = l->ofd; |
| 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); |
| /* 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. */ |
| 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 = strlen(l->prompt); |
| 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 fd = l->ofd, j; |
| 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); |
| |
| /* 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 position. */ |
| 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. */ |
| abFree(&ab); |
| } |
| |
| /* Calls the two low level functions refreshSingleLine() or |
| * refreshMultiLine() according to the selected mode. */ |
| void linenoiseRefreshLine(void) { |
| if (mlmode) |
| refreshMultiLine(&ls); |
| else |
| refreshSingleLine(&ls); |
| } |
| |
| /* 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) /* || mlmode */) { |
| /* Avoid a full update of the line in the |
| * trivial case. */ |
| if (write(l->ofd,&c,1) == -1) return -1; |
| } else { |
| linenoiseRefreshLine(); |
| } |
| } 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'; |
| linenoiseRefreshLine(); |
| } |
| } |
| return 0; |
| } |
| |
| /* Move cursor on the left. */ |
| void linenoiseEditMoveLeft(struct linenoiseState *l) { |
| if (l->pos > 0) { |
| l->pos--; |
| linenoiseRefreshLine(); |
| } |
| } |
| |
| /* Move cursor on the right. */ |
| void linenoiseEditMoveRight(struct linenoiseState *l) { |
| if (l->pos != l->len) { |
| l->pos++; |
| linenoiseRefreshLine(); |
| } |
| } |
| |
| /* Move cursor to the start of the line. */ |
| void linenoiseEditMoveHome(struct linenoiseState *l) { |
| if (l->pos != 0) { |
| l->pos = 0; |
| linenoiseRefreshLine(); |
| } |
| } |
| |
| /* Move cursor to the end of the line. */ |
| void linenoiseEditMoveEnd(struct linenoiseState *l) { |
| if (l->pos != l->len) { |
| l->pos = l->len; |
| linenoiseRefreshLine(); |
| } |
| } |
| |
| /* 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); |
| linenoiseRefreshLine(); |
| } |
| } |
| |
| /* 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'; |
| linenoiseRefreshLine(); |
| } |
| } |
| |
| /* 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'; |
| linenoiseRefreshLine(); |
| } |
| } |
| |
| /* 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; |
| linenoiseRefreshLine(); |
| } |
| |
| /* 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(int stdin_fd, int stdout_fd, char *buf, size_t buflen, const char *prompt) |
| { |
| /* Populate the linenoise state that we pass to functions implementing |
| * specific editing functionalities. */ |
| ls.ifd = stdin_fd; |
| ls.ofd = stdout_fd; |
| ls.buf = buf; |
| ls.buflen = buflen; |
| ls.prompt = prompt; |
| ls.plen = strlen(prompt); |
| ls.oldpos = ls.pos = 0; |
| ls.len = 0; |
| ls.cols = getColumns(stdin_fd, stdout_fd); |
| ls.maxrows = 0; |
| ls.history_index = 0; |
| |
| /* Buffer starts empty. */ |
| ls.buf[0] = '\0'; |
| ls.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(ls.ofd,prompt,ls.plen) == -1) return -1; |
| while(1) { |
| int c = 0, nread; |
| char seq[3]; |
| |
| nread = read(ls.ifd,&c,1); |
| if (nread <= 0) return ls.len; |
| |
| /* 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) { |
| c = completeLine(&ls); |
| /* Return on errors */ |
| if (c < 0) return ls.len; |
| /* Read next character when 0 */ |
| if (c == 0) continue; |
| } |
| |
| switch(c) { |
| case ENTER: /* enter */ |
| history_len--; |
| free(history[history_len]); |
| if (mlmode) linenoiseEditMoveEnd(&ls); |
| return (int)ls.len; |
| case CTRL_C: /* ctrl-c */ |
| errno = EAGAIN; |
| return -1; |
| case BACKSPACE: /* backspace */ |
| case 8: /* ctrl-h */ |
| linenoiseEditBackspace(&ls); |
| break; |
| case CTRL_D: /* ctrl-d, remove char at right of cursor, or if the |
| line is empty, act as end-of-file. */ |
| if (ls.len > 0) { |
| linenoiseEditDelete(&ls); |
| } else { |
| history_len--; |
| free(history[history_len]); |
| return -1; |
| } |
| break; |
| case CTRL_T: /* ctrl-t, swaps current character with previous. */ |
| if (ls.pos > 0 && ls.pos < ls.len) { |
| int aux = buf[ls.pos-1]; |
| buf[ls.pos-1] = buf[ls.pos]; |
| buf[ls.pos] = aux; |
| if (ls.pos != ls.len-1) ls.pos++; |
| linenoiseRefreshLine(); |
| } |
| break; |
| case CTRL_B: /* ctrl-b */ |
| linenoiseEditMoveLeft(&ls); |
| break; |
| case CTRL_F: /* ctrl-f */ |
| linenoiseEditMoveRight(&ls); |
| break; |
| case CTRL_P: /* ctrl-p */ |
| linenoiseEditHistoryNext(&ls, LINENOISE_HISTORY_PREV); |
| break; |
| case CTRL_N: /* ctrl-n */ |
| linenoiseEditHistoryNext(&ls, LINENOISE_HISTORY_NEXT); |
| break; |
| case ESC: /* escape sequence */ |
| /* Read the next two bytes representing the escape sequence. |
| * Use two calls to handle slow terminals returning the two |
| * chars at different times. */ |
| if (read(ls.ifd,seq,1) == -1) break; |
| if (read(ls.ifd,seq+1,1) == -1) break; |
| |
| /* ESC [ sequences. */ |
| if (seq[0] == '[') { |
| if (seq[1] >= '0' && seq[1] <= '9') { |
| /* Extended escape, read additional byte. */ |
| if (read(ls.ifd,seq+2,1) == -1) break; |
| if (seq[2] == '~') { |
| switch(seq[1]) { |
| case '3': /* Delete key. */ |
| linenoiseEditDelete(&ls); |
| break; |
| } |
| } |
| } else { |
| switch(seq[1]) { |
| case 'A': /* Up */ |
| linenoiseEditHistoryNext(&ls, LINENOISE_HISTORY_PREV); |
| break; |
| case 'B': /* Down */ |
| linenoiseEditHistoryNext(&ls, LINENOISE_HISTORY_NEXT); |
| break; |
| case 'C': /* Right */ |
| linenoiseEditMoveRight(&ls); |
| break; |
| case 'D': /* Left */ |
| linenoiseEditMoveLeft(&ls); |
| break; |
| case 'H': /* Home */ |
| linenoiseEditMoveHome(&ls); |
| break; |
| case 'F': /* End*/ |
| linenoiseEditMoveEnd(&ls); |
| break; |
| } |
| } |
| } |
| |
| /* ESC O sequences. */ |
| else if (seq[0] == 'O') { |
| switch(seq[1]) { |
| case 'H': /* Home */ |
| linenoiseEditMoveHome(&ls); |
| break; |
| case 'F': /* End*/ |
| linenoiseEditMoveEnd(&ls); |
| break; |
| } |
| } |
| break; |
| default: |
| if (linenoiseEditInsert(&ls,c)) return -1; |
| break; |
| case CTRL_U: /* Ctrl+u, delete the whole line. */ |
| buf[0] = '\0'; |
| ls.pos = ls.len = 0; |
| linenoiseRefreshLine(); |
| break; |
| case CTRL_K: /* Ctrl+k, delete from current to end of line. */ |
| buf[ls.pos] = '\0'; |
| ls.len = ls.pos; |
| linenoiseRefreshLine(); |
| break; |
| case CTRL_A: /* Ctrl+a, go to the start of the line */ |
| linenoiseEditMoveHome(&ls); |
| break; |
| case CTRL_E: /* ctrl+e, go to the end of the line */ |
| linenoiseEditMoveEnd(&ls); |
| break; |
| case CTRL_L: /* ctrl+l, clear screen */ |
| linenoiseClearScreen(); |
| linenoiseRefreshLine(); |
| break; |
| case CTRL_W: /* ctrl+w, delete previous word */ |
| linenoiseEditDeletePrevWord(&ls); |
| break; |
| } |
| } |
| return ls.len; |
| } |
| |
| /* This special mode is used by linenoise in order to print scan codes |
| * on screen for debugging / development purposes. It is implemented |
| * by the linenoise_example program using the --keycodes option. */ |
| void linenoisePrintKeyCodes(void) { |
| char quit[4]; |
| |
| printf("Linenoise key codes debugging mode.\n" |
| "Press keys to see scan codes. Type 'quit' at any time to exit.\n"); |
| if (linenoiseEnableRawMode(STDIN_FILENO) == -1) return; |
| memset(quit,' ',4); |
| while(1) { |
| char c; |
| int nread; |
| |
| nread = read(STDIN_FILENO,&c,1); |
| if (nread <= 0) continue; |
| memmove(quit,quit+1,sizeof(quit)-1); /* shift string to left. */ |
| quit[sizeof(quit)-1] = c; /* Insert current char on the right. */ |
| if (memcmp(quit,"quit",sizeof(quit)) == 0) break; |
| |
| printf("'%c' %02x (%d) (type quit to exit)\n", |
| isprint(c) ? c : '?', (int)c, (int)c); |
| printf("\r"); /* Go left edge manually, we are in raw mode. */ |
| fflush(stdout); |
| } |
| linenoiseDisableRawMode(STDIN_FILENO); |
| } |
| |
| /* This function calls the line editing function linenoiseEdit() using |
| * the STDIN file descriptor set in raw mode. */ |
| static int linenoiseRaw(char *buf, size_t buflen, const char *prompt) { |
| int count; |
| |
| if (buflen == 0) { |
| errno = EINVAL; |
| return -1; |
| } |
| if (!isatty(STDIN_FILENO)) { |
| /* Not a tty: read from file / pipe. */ |
| if (fgets(buf, buflen, stdin) == NULL) return -1; |
| count = strlen(buf); |
| if (count && buf[count-1] == '\n') { |
| count--; |
| buf[count] = '\0'; |
| } |
| } else { |
| /* Interactive editing. */ |
| if (linenoiseEnableRawMode(STDIN_FILENO) == -1) return -1; |
| count = linenoiseEdit(STDIN_FILENO, STDOUT_FILENO, buf, buflen, prompt); |
| linenoiseDisableRawMode(STDIN_FILENO); |
| printf("\n"); |
| } |
| return count; |
| } |
| |
| /* The high level function that is the main API of the linenoise library. |
| * This function checks if the terminal has basic capabilities, just checking |
| * for a blacklist of stupid terminals, and later either calls the line |
| * editing function or uses dummy fgets() so that you will be able to type |
| * something even in the most desperate of the conditions. */ |
| char *linenoise(const char *prompt) { |
| char buf[LINENOISE_MAX_LINE]; |
| int count; |
| |
| if (isUnsupportedTerm()) { |
| size_t len; |
| |
| printf("%s",prompt); |
| fflush(stdout); |
| if (fgets(buf,LINENOISE_MAX_LINE,stdin) == NULL) return NULL; |
| len = strlen(buf); |
| while(len && (buf[len-1] == '\n' || buf[len-1] == '\r')) { |
| len--; |
| buf[len] = '\0'; |
| } |
| return strdup(buf); |
| } else { |
| count = linenoiseRaw(buf,LINENOISE_MAX_LINE,prompt); |
| if (count == -1) return NULL; |
| return strdup(buf); |
| } |
| } |
| |
| /* ================================ History ================================= */ |
| |
| /* Free the history, but does not reset it. Only used when we have to |
| * exit() to avoid memory leaks are reported by valgrind & co. */ |
| static void freeHistory(void) { |
| if (history) { |
| int j; |
| |
| for (j = 0; j < history_len; j++) |
| free(history[j]); |
| free(history); |
| } |
| } |
| |
| /* At exit we'll try to fix the terminal to the initial conditions. */ |
| static void linenoiseAtExit(void) { |
| linenoiseDisableRawMode(STDIN_FILENO); |
| freeHistory(); |
| } |
| |
| /* 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 = fopen(filename,"w"); |
| int j; |
| |
| 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"); |
| char buf[LINENOISE_MAX_LINE]; |
| |
| if (fp == NULL) return -1; |
| |
| while (fgets(buf,LINENOISE_MAX_LINE,fp) != NULL) { |
| char *p; |
| |
| p = strchr(buf,'\r'); |
| if (!p) p = strchr(buf,'\n'); |
| if (p) *p = '\0'; |
| linenoiseHistoryAdd(buf); |
| } |
| fclose(fp); |
| return 0; |
| } |