Edit
kc3-lang/linenoise/linenoise.c
antirez
- linenoise.c
-
/* 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) 2010-2023, 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 <sys/stat.h> #include <sys/types.h> #include <sys/ioctl.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 linenoiseHintsCallback *hintsCallback = NULL; static linenoiseFreeHintsCallback *freeHintsCallback = NULL; static char *linenoiseNoTTY(void); static void refreshLineWithCompletion(struct linenoiseState *ls, linenoiseCompletions *lc, int flags); static void refreshLineWithFlags(struct linenoiseState *l, int flags); static struct termios orig_termios; /* In order to restore at exit.*/ static int maskmode = 0; /* Show "***" instead of input. For passwords. */ static int rawmode = 0; /* For atexit() function to check if restore is needed*/ 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; 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); #define REFRESH_CLEAN (1<<0) // Clean the old prompt from the screen #define REFRESH_WRITE (1<<1) // Rewrite the prompt on the screen. #define REFRESH_ALL (REFRESH_CLEAN|REFRESH_WRITE) // Do both. 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 ====================== */ /* Enable "mask mode". When it is enabled, instead of the input that * the user is typing, the terminal will just display a corresponding * number of asterisks, like "****". This is useful for passwords and other * secrets that should not be displayed. */ void linenoiseMaskModeEnable(void) { maskmode = 1; } /* Disable mask mode. */ void linenoiseMaskModeDisable(void) { maskmode = 0; } /* 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. */ static int enableRawMode(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; rawmode = 1; return 0; fatal: errno = ENOTTY; return -1; } static void disableRawMode(int fd) { /* Don't even check the return value as it's too late. */ if (rawmode && tcsetattr(fd,TCSAFLUSH,&orig_termios) != -1) 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); } /* Called by completeLine() and linenoiseShow() to render the current * edited line with the proposed completion. If the current completion table * is already available, it is passed as second argument, otherwise the * function will use the callback to obtain it. * * Flags are the same as refreshLine*(), that is REFRESH_* macros. */ static void refreshLineWithCompletion(struct linenoiseState *ls, linenoiseCompletions *lc, int flags) { /* Obtain the table of completions if the caller didn't provide one. */ linenoiseCompletions ctable = { 0, NULL }; if (lc == NULL) { completionCallback(ls->buf,&ctable); lc = &ctable; } /* Show the edited line with completion if possible, or just refresh. */ if (ls->completion_idx < lc->len) { struct linenoiseState saved = *ls; ls->len = ls->pos = strlen(lc->cvec[ls->completion_idx]); ls->buf = lc->cvec[ls->completion_idx]; refreshLineWithFlags(ls,flags); ls->len = saved.len; ls->pos = saved.pos; ls->buf = saved.buf; } else { refreshLineWithFlags(ls,flags); } /* Free the completions table if needed. */ if (lc != &ctable) freeCompletions(&ctable); } /* 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. * * If the function returns non-zero, the caller should handle the * returned value as a byte read from the standard input, and process * it as usually: this basically means that the function may return a byte * read from the termianl but not processed. Otherwise, if zero is returned, * the input was consumed by the completeLine() function to navigate the * possible completions, and the caller should read for the next characters * from stdin. */ static int completeLine(struct linenoiseState *ls, int keypressed) { linenoiseCompletions lc = { 0, NULL }; int nwritten; char c = keypressed; completionCallback(ls->buf,&lc); if (lc.len == 0) { linenoiseBeep(); ls->in_completion = 0; } else { switch(c) { case 9: /* tab */ if (ls->in_completion == 0) { 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(); } 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) { 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) { 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); 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(struct linenoiseState *l, int flags) { 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,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 (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. * * 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]; 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 (flags & REFRESH_CLEAN) { 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)); } } if (flags & REFRESH_ALL) { /* Clean the top line. */ lndebug("clear"); 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) { unsigned int i; for (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) { 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. */ 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. */ char d = (maskmode==1) ? '*' : c; if (write(l->ofd,&d,1) == -1) return -1; } 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; } /* 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); } /* 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, 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. */ l->in_completion = 0; l->ifd = stdin_fd != -1 ? stdin_fd : STDIN_FILENO; l->ofd = stdout_fd != -1 ? stdout_fd : STDOUT_FILENO; l->buf = buf; l->buflen = buflen; l->prompt = prompt; l->plen = strlen(prompt); l->oldpos = l->pos = 0; l->len = 0; l->cols = getColumns(stdin_fd, stdout_fd); 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 */ /* If stdin is not a tty, stop here with the initialization. We * will actually just read a line from standard input in blocking * mode later, in linenoiseEditFeed(). */ if (!isatty(l->ifd)) return 0; /* Enter raw mode. */ if (enableRawMode(l->ifd) == -1) return -1; /* The latest history entry is always our current buffer, that * initially is just an empty string. */ linenoiseHistoryAdd(""); if (write(l->ofd,prompt,l->plen) == -1) return -1; 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) { /* Not a TTY, pass control to line reading without character * count limits. */ if (!isatty(l->ifd)) return linenoiseNoTTY(); char c; int nread; char seq[3]; nread = read(l->ifd,&c,1); if (nread <= 0) return NULL; /* 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 */ if (c < 0) return NULL; /* Read next character when 0 */ if (c == 0) 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; } return strdup(l->buf); case CTRL_C: /* ctrl-c */ errno = EAGAIN; 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; return NULL; } break; case CTRL_T: /* ctrl-t, swaps current character with previous. */ if (l->pos > 0 && l->pos < l->len) { 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. * Use two calls to handle slow terminals returning the two * chars at different times. */ if (read(l->ifd,seq,1) == -1) break; if (read(l->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(l->ifd,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 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; } 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) { if (!isatty(l->ifd)) return; disableRawMode(l->ifd); printf("\n"); } /* 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(int stdin_fd, int stdout_fd, char *buf, size_t buflen, const char *prompt) { struct linenoiseState l; /* Editing without a buffer is invalid. */ if (buflen == 0) { errno = EINVAL; return NULL; } linenoiseEditStart(&l,stdin_fd,stdout_fd,buf,buflen,prompt); char *res; while((res = linenoiseEditFeed(&l)) == linenoiseEditMore); linenoiseEditStop(&l); return res; } /* 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 (enableRawMode(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); } disableRawMode(STDIN_FILENO); } /* This function is called when linenoise() is called with the standard * input file descriptor not attached to a TTY. So for example when the * program using linenoise is called in pipe or with a file redirected * to its standard input. In this case, we want to be able to return the * line regardless of its length (by default we are limited to 4k). */ static char *linenoiseNoTTY(void) { char *line = NULL; size_t len = 0, maxlen = 0; while(1) { if (len == maxlen) { if (maxlen == 0) maxlen = 16; maxlen *= 2; char *oldval = line; line = realloc(line,maxlen); if (line == NULL) { if (oldval) free(oldval); return NULL; } } int c = fgetc(stdin); if (c == EOF || c == '\n') { if (c == EOF && len == 0) { free(line); return NULL; } else { line[len] = '\0'; return line; } } else { line[len] = c; len++; } } } /* 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]; if (!isatty(STDIN_FILENO)) { /* Not a tty: read from file / pipe. In this mode we don't want any * limit to the line size, so we call a function to handle that. */ return linenoiseNoTTY(); } else 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 { char *retval = linenoiseBlockingEdit(STDIN_FILENO,STDOUT_FILENO,buf,LINENOISE_MAX_LINE,prompt); 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 ================================= */ /* 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) { disableRawMode(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) { mode_t old_umask = umask(S_IXUSR|S_IRWXG|S_IRWXO); FILE *fp; int j; fp = fopen(filename,"w"); umask(old_umask); if (fp == NULL) return -1; chmod(filename,S_IRUSR|S_IWUSR); 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; }