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linenoise.c

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00001 /* 
00002  * $Id: linenoise.c,v 1.3 2020/05/22 05:53:27 johns Exp $ 
00003  *
00004  * Modified linenoise from the standard distribution by adding 
00005  * user context parameters for each of the callbacks, so that
00006  * the caller can pass in runtime-generated lists of command
00007  * completion strings without the use of global variables or 
00008  * other undesirable methods.
00009  *
00010  * Further modifications were made to the linenoise Unix TTY handling code
00011  * to allow VMD to control TTY buffer flushes when switching between raw and 
00012  * cooked TTY mode.  This is required so that VMD can switch to raw mode
00013  * for character-at-a-time input, so that linenoise doesn't have 
00014  * blocking behavior that prevents the VMD main loop from free-running.
00015  * With these changes, VMD free runs except when in actual command editing.
00016  * Correct handling of VMD console output is made more complex by entry 
00017  * and return from raw TTY mode, but it is a much more usable scenario
00018  * for the end user.
00019  */
00020 
00021 /* linenoise.c -- guerrilla line editing library against the idea that a
00022  * line editing lib needs to be 20,000 lines of C code.
00023  *
00024  * You can find the latest source code at:
00025  *
00026  *   http://github.com/antirez/linenoise
00027  *
00028  * Does a number of crazy assumptions that happen to be true in 99.9999% of
00029  * the 2010 UNIX computers around.
00030  *
00031  * ------------------------------------------------------------------------
00032  *
00033  * Copyright (c) 2010-2016, Salvatore Sanfilippo <antirez at gmail dot com>
00034  * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
00035  *
00036  * All rights reserved.
00037  *
00038  * Redistribution and use in source and binary forms, with or without
00039  * modification, are permitted provided that the following conditions are
00040  * met:
00041  *
00042  *  *  Redistributions of source code must retain the above copyright
00043  *     notice, this list of conditions and the following disclaimer.
00044  *
00045  *  *  Redistributions in binary form must reproduce the above copyright
00046  *     notice, this list of conditions and the following disclaimer in the
00047  *     documentation and/or other materials provided with the distribution.
00048  *
00049  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00050  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00051  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
00052  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
00053  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00054  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
00055  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00056  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00057  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00058  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00059  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00060  *
00061  * ------------------------------------------------------------------------
00062  *
00063  * References:
00064  * - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
00065  * - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
00066  *
00067  * Todo list:
00068  * - Filter bogus Ctrl+<char> combinations.
00069  * - Win32 support
00070  *
00071  * Bloat:
00072  * - History search like Ctrl+r in readline?
00073  *
00074  * List of escape sequences used by this program, we do everything just
00075  * with three sequences. In order to be so cheap we may have some
00076  * flickering effect with some slow terminal, but the lesser sequences
00077  * the more compatible.
00078  *
00079  * EL (Erase Line)
00080  *    Sequence: ESC [ n K
00081  *    Effect: if n is 0 or missing, clear from cursor to end of line
00082  *    Effect: if n is 1, clear from beginning of line to cursor
00083  *    Effect: if n is 2, clear entire line
00084  *
00085  * CUF (CUrsor Forward)
00086  *    Sequence: ESC [ n C
00087  *    Effect: moves cursor forward n chars
00088  *
00089  * CUB (CUrsor Backward)
00090  *    Sequence: ESC [ n D
00091  *    Effect: moves cursor backward n chars
00092  *
00093  * The following is used to get the terminal width if getting
00094  * the width with the TIOCGWINSZ ioctl fails
00095  *
00096  * DSR (Device Status Report)
00097  *    Sequence: ESC [ 6 n
00098  *    Effect: reports the current cusor position as ESC [ n ; m R
00099  *            where n is the row and m is the column
00100  *
00101  * When multi line mode is enabled, we also use an additional escape
00102  * sequence. However multi line editing is disabled by default.
00103  *
00104  * CUU (Cursor Up)
00105  *    Sequence: ESC [ n A
00106  *    Effect: moves cursor up of n chars.
00107  *
00108  * CUD (Cursor Down)
00109  *    Sequence: ESC [ n B
00110  *    Effect: moves cursor down of n chars.
00111  *
00112  * When linenoiseClearScreen() is called, two additional escape sequences
00113  * are used in order to clear the screen and position the cursor at home
00114  * position.
00115  *
00116  * CUP (Cursor position)
00117  *    Sequence: ESC [ H
00118  *    Effect: moves the cursor to upper left corner
00119  *
00120  * ED (Erase display)
00121  *    Sequence: ESC [ 2 J
00122  *    Effect: clear the whole screen
00123  *
00124  */
00125 
00126 #include <termios.h>
00127 #include <unistd.h>
00128 #include <stdlib.h>
00129 #include <stdio.h>
00130 #include <errno.h>
00131 #include <string.h>
00132 #include <stdlib.h>
00133 #include <ctype.h>
00134 #include <sys/stat.h>
00135 #include <sys/types.h>
00136 #include <sys/ioctl.h>
00137 #include <unistd.h>
00138 #include "linenoise.h"
00139 
00140 #define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
00141 #define LINENOISE_MAX_LINE 4096
00142 static char *unsupported_term[] = {"dumb","cons25","emacs",NULL};
00143 static linenoiseCompletionCallback *completionCallback = NULL;
00144 static void * completionCallbackCtx = NULL;
00145 static linenoiseHintsCallback *hintsCallback = NULL;
00146 static void * hintsCallbackCtx = NULL;
00147 static linenoiseFreeHintsCallback *freeHintsCallback = NULL;
00148 static void * freeHintsCallbackCtx = NULL;
00149 
00150 static struct termios orig_termios; /* In order to restore at exit.*/
00151 static int maskmode = 0; /* Show "***" instead of input. For passwords. */
00152 static int rawmode = 0; /* For atexit() function to check if restore is needed*/
00153 static int mlmode = 0;  /* Multi line mode. Default is single line. */
00154 static int atexit_registered = 0; /* Register atexit just 1 time. */
00155 static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
00156 static int history_len = 0;
00157 static char **history = NULL;
00158 
00159 /* The linenoiseState structure represents the state during line editing.
00160  * We pass this state to functions implementing specific editing
00161  * functionalities. */
00162 struct linenoiseState {
00163     int ifd;            /* Terminal stdin file descriptor. */
00164     int ofd;            /* Terminal stdout file descriptor. */
00165     char *buf;          /* Edited line buffer. */
00166     size_t buflen;      /* Edited line buffer size. */
00167     const char *prompt; /* Prompt to display. */
00168     size_t plen;        /* Prompt length. */
00169     size_t pos;         /* Current cursor position. */
00170     size_t oldpos;      /* Previous refresh cursor position. */
00171     size_t len;         /* Current edited line length. */
00172     size_t cols;        /* Number of columns in terminal. */
00173     size_t maxrows;     /* Maximum num of rows used so far (multiline mode) */
00174     int history_index;  /* The history index we are currently editing. */
00175 };
00176 
00177 enum KEY_ACTION{
00178         KEY_NULL = 0,       /* NULL */
00179         CTRL_A = 1,         /* Ctrl+a */
00180         CTRL_B = 2,         /* Ctrl-b */
00181         CTRL_C = 3,         /* Ctrl-c */
00182         CTRL_D = 4,         /* Ctrl-d */
00183         CTRL_E = 5,         /* Ctrl-e */
00184         CTRL_F = 6,         /* Ctrl-f */
00185         CTRL_H = 8,         /* Ctrl-h */
00186         TAB = 9,            /* Tab */
00187         CTRL_K = 11,        /* Ctrl+k */
00188         CTRL_L = 12,        /* Ctrl+l */
00189         ENTER = 13,         /* Enter */
00190         CTRL_N = 14,        /* Ctrl-n */
00191         CTRL_P = 16,        /* Ctrl-p */
00192         CTRL_T = 20,        /* Ctrl-t */
00193         CTRL_U = 21,        /* Ctrl+u */
00194         CTRL_W = 23,        /* Ctrl+w */
00195         ESC = 27,           /* Escape */
00196         BACKSPACE =  127    /* Backspace */
00197 };
00198 
00199 static void linenoiseAtExit(void);
00200 int linenoiseHistoryAdd(const char *line);
00201 static void refreshLine(struct linenoiseState *l);
00202 
00203 /* Debugging macro. */
00204 #if 0
00205 FILE *lndebug_fp = NULL;
00206 #define lndebug(...) \
00207     do { \
00208         if (lndebug_fp == NULL) { \
00209             lndebug_fp = fopen("/tmp/lndebug.txt","a"); \
00210             fprintf(lndebug_fp, \
00211             "[%d %d %d] p: %d, rows: %d, rpos: %d, max: %d, oldmax: %d\n", \
00212             (int)l->len,(int)l->pos,(int)l->oldpos,plen,rows,rpos, \
00213             (int)l->maxrows,old_rows); \
00214         } \
00215         fprintf(lndebug_fp, ", " __VA_ARGS__); \
00216         fflush(lndebug_fp); \
00217     } while (0)
00218 #else
00219 #define lndebug(fmt, ...)
00220 #endif
00221 
00222 /* ======================= Low level terminal handling ====================== */
00223 
00224 /* Enable "mask mode". When it is enabled, instead of the input that
00225  * the user is typing, the terminal will just display a corresponding
00226  * number of asterisks, like "****". This is useful for passwords and other
00227  * secrets that should not be displayed. */
00228 void linenoiseMaskModeEnable(void) {
00229     maskmode = 1;
00230 }
00231 
00232 /* Disable mask mode. */
00233 void linenoiseMaskModeDisable(void) {
00234     maskmode = 0;
00235 }
00236 
00237 /* Set if to use or not the multi line mode. */
00238 void linenoiseSetMultiLine(int ml) {
00239     mlmode = ml;
00240 }
00241 
00242 /* Return true if the terminal name is in the list of terminals we know are
00243  * not able to understand basic escape sequences. */
00244 static int isUnsupportedTerm(void) {
00245     char *term = getenv("TERM");
00246     int j;
00247 
00248     if (term == NULL) return 0;
00249     for (j = 0; unsupported_term[j]; j++)
00250         if (!strcasecmp(term,unsupported_term[j])) return 1;
00251     return 0;
00252 }
00253 
00254 /* Raw mode: 1960 magic shit. */
00255 int enableRawMode(int fd, int flush) {
00256     struct termios raw;
00257 
00258     if (!isatty(STDIN_FILENO)) goto fatal;
00259     if (!atexit_registered) {
00260         atexit(linenoiseAtExit);
00261         atexit_registered = 1;
00262     }
00263     if (tcgetattr(fd,&orig_termios) == -1) goto fatal;
00264 
00265     raw = orig_termios;  /* modify the original mode */
00266     /* input modes: no break, no CR to NL, no parity check, no strip char,
00267      * no start/stop output control. */
00268     raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
00269     /* output modes - disable post processing */
00270     raw.c_oflag &= ~(OPOST);
00271     /* control modes - set 8 bit chars */
00272     raw.c_cflag |= (CS8);
00273     /* local modes - choing off, canonical off, no extended functions,
00274      * no signal chars (^Z,^C) */
00275     raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
00276     /* control chars - set return condition: min number of bytes and timer.
00277      * We want read to return every single byte, without timeout. */
00278     raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */
00279 
00280     /* put terminal in raw mode after flushing */
00281     if (tcsetattr(fd,(flush) ? TCSAFLUSH : TCSANOW, &raw) < 0) goto fatal;
00282     rawmode = 1;
00283     return 0;
00284 
00285 fatal:
00286     errno = ENOTTY;
00287     return -1;
00288 }
00289 
00290 void disableRawMode(int fd, int flush) {
00291     /* Don't even check the return value as it's too late. */
00292     if (rawmode && tcsetattr(fd,(flush) ? TCSAFLUSH : TCSANOW,&orig_termios) != -1)
00293         rawmode = 0;
00294 }
00295 
00296 /* Use the ESC [6n escape sequence to query the horizontal cursor position
00297  * and return it. On error -1 is returned, on success the position of the
00298  * cursor. */
00299 static int getCursorPosition(int ifd, int ofd) {
00300     char buf[32];
00301     int cols, rows;
00302     unsigned int i = 0;
00303 
00304     /* Report cursor location */
00305     if (write(ofd, "\x1b[6n", 4) != 4) return -1;
00306 
00307     /* Read the response: ESC [ rows ; cols R */
00308     while (i < sizeof(buf)-1) {
00309         if (read(ifd,buf+i,1) != 1) break;
00310         if (buf[i] == 'R') break;
00311         i++;
00312     }
00313     buf[i] = '\0';
00314 
00315     /* Parse it. */
00316     if (buf[0] != ESC || buf[1] != '[') return -1;
00317     if (sscanf(buf+2,"%d;%d",&rows,&cols) != 2) return -1;
00318     return cols;
00319 }
00320 
00321 /* Try to get the number of columns in the current terminal, or assume 80
00322  * if it fails. */
00323 static int getColumns(int ifd, int ofd) {
00324     struct winsize ws;
00325 
00326     if (ioctl(1, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
00327         /* ioctl() failed. Try to query the terminal itself. */
00328         int start, cols;
00329 
00330         /* Get the initial position so we can restore it later. */
00331         start = getCursorPosition(ifd,ofd);
00332         if (start == -1) goto failed;
00333 
00334         /* Go to right margin and get position. */
00335         if (write(ofd,"\x1b[999C",6) != 6) goto failed;
00336         cols = getCursorPosition(ifd,ofd);
00337         if (cols == -1) goto failed;
00338 
00339         /* Restore position. */
00340         if (cols > start) {
00341             char seq[32];
00342             snprintf(seq,32,"\x1b[%dD",cols-start);
00343             if (write(ofd,seq,strlen(seq)) == -1) {
00344                 /* Can't recover... */
00345             }
00346         }
00347         return cols;
00348     } else {
00349         return ws.ws_col;
00350     }
00351 
00352 failed:
00353     return 80;
00354 }
00355 
00356 /* Clear the screen. Used to handle ctrl+l */
00357 void linenoiseClearScreen(void) {
00358     if (write(STDOUT_FILENO,"\x1b[H\x1b[2J",7) <= 0) {
00359         /* nothing to do, just to avoid warning. */
00360     }
00361 }
00362 
00363 /* Beep, used for completion when there is nothing to complete or when all
00364  * the choices were already shown. */
00365 static void linenoiseBeep(void) {
00366     fprintf(stderr, "\x7");
00367     fflush(stderr);
00368 }
00369 
00370 /* ============================== Completion ================================ */
00371 
00372 /* Free a list of completion option populated by linenoiseAddCompletion(). */
00373 static void freeCompletions(linenoiseCompletions *lc) {
00374     size_t i;
00375     for (i = 0; i < lc->len; i++)
00376         free(lc->cvec[i]);
00377     if (lc->cvec != NULL)
00378         free(lc->cvec);
00379 }
00380 
00381 /* This is an helper function for linenoiseEdit() and is called when the
00382  * user types the <tab> key in order to complete the string currently in the
00383  * input.
00384  *
00385  * The state of the editing is encapsulated into the pointed linenoiseState
00386  * structure as described in the structure definition. */
00387 static int completeLine(struct linenoiseState *ls) {
00388     linenoiseCompletions lc = { 0, NULL };
00389     int nread, nwritten;
00390     char c = 0;
00391 
00392     completionCallback(completionCallbackCtx,ls->buf,&lc);
00393     if (lc.len == 0) {
00394         linenoiseBeep();
00395     } else {
00396         size_t stop = 0, i = 0;
00397 
00398         while(!stop) {
00399             /* Show completion or original buffer */
00400             if (i < lc.len) {
00401                 struct linenoiseState saved = *ls;
00402 
00403                 ls->len = ls->pos = strlen(lc.cvec[i]);
00404                 ls->buf = lc.cvec[i];
00405                 refreshLine(ls);
00406                 ls->len = saved.len;
00407                 ls->pos = saved.pos;
00408                 ls->buf = saved.buf;
00409             } else {
00410                 refreshLine(ls);
00411             }
00412 
00413             nread = read(ls->ifd,&c,1);
00414             if (nread <= 0) {
00415                 freeCompletions(&lc);
00416                 return -1;
00417             }
00418 
00419             switch(c) {
00420                 case 9: /* tab */
00421                     i = (i+1) % (lc.len+1);
00422                     if (i == lc.len) linenoiseBeep();
00423                     break;
00424                 case 27: /* escape */
00425                     /* Re-show original buffer */
00426                     if (i < lc.len) refreshLine(ls);
00427                     stop = 1;
00428                     break;
00429                 default:
00430                     /* Update buffer and return */
00431                     if (i < lc.len) {
00432                         nwritten = snprintf(ls->buf,ls->buflen,"%s",lc.cvec[i]);
00433                         ls->len = ls->pos = nwritten;
00434                     }
00435                     stop = 1;
00436                     break;
00437             }
00438         }
00439     }
00440 
00441     freeCompletions(&lc);
00442     return c; /* Return last read character */
00443 }
00444 
00445 /* Register a callback function to be called for tab-completion. */
00446 void linenoiseSetCompletionCallback(void *uctx, linenoiseCompletionCallback *fn) {
00447     completionCallbackCtx = uctx;
00448     completionCallback = fn;
00449 }
00450 
00451 /* Register a hits function to be called to show hits to the user at the
00452  * right of the prompt. */
00453 void linenoiseSetHintsCallback(void *uctx, linenoiseHintsCallback *fn) {
00454     hintsCallbackCtx = uctx;
00455     hintsCallback = fn;
00456 }
00457 
00458 /* Register a function to free the hints returned by the hints callback
00459  * registered with linenoiseSetHintsCallback(). */
00460 void linenoiseSetFreeHintsCallback(void *uctx, linenoiseFreeHintsCallback *fn) {
00461     freeHintsCallbackCtx = uctx;
00462     freeHintsCallback = fn;
00463 }
00464 
00465 /* This function is used by the callback function registered by the user
00466  * in order to add completion options given the input string when the
00467  * user typed <tab>. See the example.c source code for a very easy to
00468  * understand example. */
00469 void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) {
00470     size_t len = strlen(str);
00471     char *copy, **cvec;
00472 
00473     copy = malloc(len+1);
00474     if (copy == NULL) return;
00475     memcpy(copy,str,len+1);
00476     cvec = realloc(lc->cvec,sizeof(char*)*(lc->len+1));
00477     if (cvec == NULL) {
00478         free(copy);
00479         return;
00480     }
00481     lc->cvec = cvec;
00482     lc->cvec[lc->len++] = copy;
00483 }
00484 
00485 /* =========================== Line editing ================================= */
00486 
00487 /* We define a very simple "append buffer" structure, that is an heap
00488  * allocated string where we can append to. This is useful in order to
00489  * write all the escape sequences in a buffer and flush them to the standard
00490  * output in a single call, to avoid flickering effects. */
00491 struct abuf {
00492     char *b;
00493     int len;
00494 };
00495 
00496 static void abInit(struct abuf *ab) {
00497     ab->b = NULL;
00498     ab->len = 0;
00499 }
00500 
00501 static void abAppend(struct abuf *ab, const char *s, int len) {
00502     char *new = realloc(ab->b,ab->len+len);
00503 
00504     if (new == NULL) return;
00505     memcpy(new+ab->len,s,len);
00506     ab->b = new;
00507     ab->len += len;
00508 }
00509 
00510 static void abFree(struct abuf *ab) {
00511     free(ab->b);
00512 }
00513 
00514 /* Helper of refreshSingleLine() and refreshMultiLine() to show hints
00515  * to the right of the prompt. */
00516 void refreshShowHints(struct abuf *ab, struct linenoiseState *l, int plen) {
00517     char seq[64];
00518     if (hintsCallback && plen+l->len < l->cols) {
00519         int color = -1, bold = 0;
00520         char *hint = hintsCallback(hintsCallbackCtx, l->buf,&color,&bold);
00521         if (hint) {
00522             int hintlen = strlen(hint);
00523             int hintmaxlen = l->cols-(plen+l->len);
00524             if (hintlen > hintmaxlen) hintlen = hintmaxlen;
00525             if (bold == 1 && color == -1) color = 37;
00526             if (color != -1 || bold != 0)
00527                 snprintf(seq,64,"\033[%d;%d;49m",bold,color);
00528             else
00529                 seq[0] = '\0';
00530             abAppend(ab,seq,strlen(seq));
00531             abAppend(ab,hint,hintlen);
00532             if (color != -1 || bold != 0)
00533                 abAppend(ab,"\033[0m",4);
00534             /* Call the function to free the hint returned. */
00535             if (freeHintsCallback) freeHintsCallback(freeHintsCallbackCtx, hint);
00536         }
00537     }
00538 }
00539 
00540 /* Single line low level line refresh.
00541  *
00542  * Rewrite the currently edited line accordingly to the buffer content,
00543  * cursor position, and number of columns of the terminal. */
00544 static void refreshSingleLine(struct linenoiseState *l) {
00545     char seq[64];
00546     size_t plen = strlen(l->prompt);
00547     int fd = l->ofd;
00548     char *buf = l->buf;
00549     size_t len = l->len;
00550     size_t pos = l->pos;
00551     struct abuf ab;
00552 
00553     while((plen+pos) >= l->cols) {
00554         buf++;
00555         len--;
00556         pos--;
00557     }
00558     while (plen+len > l->cols) {
00559         len--;
00560     }
00561 
00562     abInit(&ab);
00563     /* Cursor to left edge */
00564     snprintf(seq,64,"\r");
00565     abAppend(&ab,seq,strlen(seq));
00566     /* Write the prompt and the current buffer content */
00567     abAppend(&ab,l->prompt,strlen(l->prompt));
00568     if (maskmode == 1) {
00569         while (len--) abAppend(&ab,"*",1);
00570     } else {
00571         abAppend(&ab,buf,len);
00572     }
00573     /* Show hits if any. */
00574     refreshShowHints(&ab,l,plen);
00575     /* Erase to right */
00576     snprintf(seq,64,"\x1b[0K");
00577     abAppend(&ab,seq,strlen(seq));
00578     /* Move cursor to original position. */
00579     snprintf(seq,64,"\r\x1b[%dC", (int)(pos+plen));
00580     abAppend(&ab,seq,strlen(seq));
00581     if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
00582     abFree(&ab);
00583 }
00584 
00585 /* Multi line low level line refresh.
00586  *
00587  * Rewrite the currently edited line accordingly to the buffer content,
00588  * cursor position, and number of columns of the terminal. */
00589 static void refreshMultiLine(struct linenoiseState *l) {
00590     char seq[64];
00591     int plen = strlen(l->prompt);
00592     int rows = (plen+l->len+l->cols-1)/l->cols; /* rows used by current buf. */
00593     int rpos = (plen+l->oldpos+l->cols)/l->cols; /* cursor relative row. */
00594     int rpos2; /* rpos after refresh. */
00595     int col; /* colum position, zero-based. */
00596     int old_rows = l->maxrows;
00597     int fd = l->ofd, j;
00598     struct abuf ab;
00599 
00600     /* Update maxrows if needed. */
00601     if (rows > (int)l->maxrows) l->maxrows = rows;
00602 
00603     /* First step: clear all the lines used before. To do so start by
00604      * going to the last row. */
00605     abInit(&ab);
00606     if (old_rows-rpos > 0) {
00607         lndebug("go down %d", old_rows-rpos);
00608         snprintf(seq,64,"\x1b[%dB", old_rows-rpos);
00609         abAppend(&ab,seq,strlen(seq));
00610     }
00611 
00612     /* Now for every row clear it, go up. */
00613     for (j = 0; j < old_rows-1; j++) {
00614         lndebug("clear+up");
00615         snprintf(seq,64,"\r\x1b[0K\x1b[1A");
00616         abAppend(&ab,seq,strlen(seq));
00617     }
00618 
00619     /* Clean the top line. */
00620     lndebug("clear");
00621     snprintf(seq,64,"\r\x1b[0K");
00622     abAppend(&ab,seq,strlen(seq));
00623 
00624     /* Write the prompt and the current buffer content */
00625     abAppend(&ab,l->prompt,strlen(l->prompt));
00626     if (maskmode == 1) {
00627         unsigned int i;
00628         for (i = 0; i < l->len; i++) abAppend(&ab,"*",1);
00629     } else {
00630         abAppend(&ab,l->buf,l->len);
00631     }
00632 
00633     /* Show hits if any. */
00634     refreshShowHints(&ab,l,plen);
00635 
00636     /* If we are at the very end of the screen with our prompt, we need to
00637      * emit a newline and move the prompt to the first column. */
00638     if (l->pos &&
00639         l->pos == l->len &&
00640         (l->pos+plen) % l->cols == 0)
00641     {
00642         lndebug("<newline>");
00643         abAppend(&ab,"\n",1);
00644         snprintf(seq,64,"\r");
00645         abAppend(&ab,seq,strlen(seq));
00646         rows++;
00647         if (rows > (int)l->maxrows) l->maxrows = rows;
00648     }
00649 
00650     /* Move cursor to right position. */
00651     rpos2 = (plen+l->pos+l->cols)/l->cols; /* current cursor relative row. */
00652     lndebug("rpos2 %d", rpos2);
00653 
00654     /* Go up till we reach the expected positon. */
00655     if (rows-rpos2 > 0) {
00656         lndebug("go-up %d", rows-rpos2);
00657         snprintf(seq,64,"\x1b[%dA", rows-rpos2);
00658         abAppend(&ab,seq,strlen(seq));
00659     }
00660 
00661     /* Set column. */
00662     col = (plen+(int)l->pos) % (int)l->cols;
00663     lndebug("set col %d", 1+col);
00664     if (col)
00665         snprintf(seq,64,"\r\x1b[%dC", col);
00666     else
00667         snprintf(seq,64,"\r");
00668     abAppend(&ab,seq,strlen(seq));
00669 
00670     lndebug("\n");
00671     l->oldpos = l->pos;
00672 
00673     if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
00674     abFree(&ab);
00675 }
00676 
00677 /* Calls the two low level functions refreshSingleLine() or
00678  * refreshMultiLine() according to the selected mode. */
00679 static void refreshLine(struct linenoiseState *l) {
00680     if (mlmode)
00681         refreshMultiLine(l);
00682     else
00683         refreshSingleLine(l);
00684 }
00685 
00686 /* Insert the character 'c' at cursor current position.
00687  *
00688  * On error writing to the terminal -1 is returned, otherwise 0. */
00689 int linenoiseEditInsert(struct linenoiseState *l, char c) {
00690     if (l->len < l->buflen) {
00691         if (l->len == l->pos) {
00692             l->buf[l->pos] = c;
00693             l->pos++;
00694             l->len++;
00695             l->buf[l->len] = '\0';
00696             if ((!mlmode && l->plen+l->len < l->cols && !hintsCallback)) {
00697                 /* Avoid a full update of the line in the
00698                  * trivial case. */
00699                 char d = (maskmode==1) ? '*' : c;
00700                 if (write(l->ofd,&d,1) == -1) return -1;
00701             } else {
00702                 refreshLine(l);
00703             }
00704         } else {
00705             memmove(l->buf+l->pos+1,l->buf+l->pos,l->len-l->pos);
00706             l->buf[l->pos] = c;
00707             l->len++;
00708             l->pos++;
00709             l->buf[l->len] = '\0';
00710             refreshLine(l);
00711         }
00712     }
00713     return 0;
00714 }
00715 
00716 /* Move cursor on the left. */
00717 void linenoiseEditMoveLeft(struct linenoiseState *l) {
00718     if (l->pos > 0) {
00719         l->pos--;
00720         refreshLine(l);
00721     }
00722 }
00723 
00724 /* Move cursor on the right. */
00725 void linenoiseEditMoveRight(struct linenoiseState *l) {
00726     if (l->pos != l->len) {
00727         l->pos++;
00728         refreshLine(l);
00729     }
00730 }
00731 
00732 /* Move cursor to the start of the line. */
00733 void linenoiseEditMoveHome(struct linenoiseState *l) {
00734     if (l->pos != 0) {
00735         l->pos = 0;
00736         refreshLine(l);
00737     }
00738 }
00739 
00740 /* Move cursor to the end of the line. */
00741 void linenoiseEditMoveEnd(struct linenoiseState *l) {
00742     if (l->pos != l->len) {
00743         l->pos = l->len;
00744         refreshLine(l);
00745     }
00746 }
00747 
00748 /* Substitute the currently edited line with the next or previous history
00749  * entry as specified by 'dir'. */
00750 #define LINENOISE_HISTORY_NEXT 0
00751 #define LINENOISE_HISTORY_PREV 1
00752 void linenoiseEditHistoryNext(struct linenoiseState *l, int dir) {
00753     if (history_len > 1) {
00754         /* Update the current history entry before to
00755          * overwrite it with the next one. */
00756         free(history[history_len - 1 - l->history_index]);
00757         history[history_len - 1 - l->history_index] = strdup(l->buf);
00758         /* Show the new entry */
00759         l->history_index += (dir == LINENOISE_HISTORY_PREV) ? 1 : -1;
00760         if (l->history_index < 0) {
00761             l->history_index = 0;
00762             return;
00763         } else if (l->history_index >= history_len) {
00764             l->history_index = history_len-1;
00765             return;
00766         }
00767         strncpy(l->buf,history[history_len - 1 - l->history_index],l->buflen);
00768         l->buf[l->buflen-1] = '\0';
00769         l->len = l->pos = strlen(l->buf);
00770         refreshLine(l);
00771     }
00772 }
00773 
00774 /* Delete the character at the right of the cursor without altering the cursor
00775  * position. Basically this is what happens with the "Delete" keyboard key. */
00776 void linenoiseEditDelete(struct linenoiseState *l) {
00777     if (l->len > 0 && l->pos < l->len) {
00778         memmove(l->buf+l->pos,l->buf+l->pos+1,l->len-l->pos-1);
00779         l->len--;
00780         l->buf[l->len] = '\0';
00781         refreshLine(l);
00782     }
00783 }
00784 
00785 /* Backspace implementation. */
00786 void linenoiseEditBackspace(struct linenoiseState *l) {
00787     if (l->pos > 0 && l->len > 0) {
00788         memmove(l->buf+l->pos-1,l->buf+l->pos,l->len-l->pos);
00789         l->pos--;
00790         l->len--;
00791         l->buf[l->len] = '\0';
00792         refreshLine(l);
00793     }
00794 }
00795 
00796 /* Delete the previosu word, maintaining the cursor at the start of the
00797  * current word. */
00798 void linenoiseEditDeletePrevWord(struct linenoiseState *l) {
00799     size_t old_pos = l->pos;
00800     size_t diff;
00801 
00802     while (l->pos > 0 && l->buf[l->pos-1] == ' ')
00803         l->pos--;
00804     while (l->pos > 0 && l->buf[l->pos-1] != ' ')
00805         l->pos--;
00806     diff = old_pos - l->pos;
00807     memmove(l->buf+l->pos,l->buf+old_pos,l->len-old_pos+1);
00808     l->len -= diff;
00809     refreshLine(l);
00810 }
00811 
00812 /* This function is the core of the line editing capability of linenoise.
00813  * It expects 'fd' to be already in "raw mode" so that every key pressed
00814  * will be returned ASAP to read().
00815  *
00816  * The resulting string is put into 'buf' when the user type enter, or
00817  * when ctrl+d is typed.
00818  *
00819  * The function returns the length of the current buffer. */
00820 static int linenoiseEdit(int stdin_fd, int stdout_fd, char *buf, size_t buflen, const char *prompt)
00821 {
00822     struct linenoiseState l;
00823 
00824     /* Populate the linenoise state that we pass to functions implementing
00825      * specific editing functionalities. */
00826     l.ifd = stdin_fd;
00827     l.ofd = stdout_fd;
00828     l.buf = buf;
00829     l.buflen = buflen;
00830     l.prompt = prompt;
00831     l.plen = strlen(prompt);
00832     l.oldpos = l.pos = 0;
00833     l.len = 0;
00834     l.cols = getColumns(stdin_fd, stdout_fd);
00835     l.maxrows = 0;
00836     l.history_index = 0;
00837 
00838     /* Buffer starts empty. */
00839     l.buf[0] = '\0';
00840     l.buflen--; /* Make sure there is always space for the nulterm */
00841 
00842     /* The latest history entry is always our current buffer, that
00843      * initially is just an empty string. */
00844     linenoiseHistoryAdd("");
00845 
00846     if (write(l.ofd,prompt,l.plen) == -1) return -1;
00847     while(1) {
00848         char c;
00849         int nread;
00850         char seq[3];
00851 
00852         nread = read(l.ifd,&c,1);
00853         if (nread <= 0) return l.len;
00854 
00855         /* Only autocomplete when the callback is set. It returns < 0 when
00856          * there was an error reading from fd. Otherwise it will return the
00857          * character that should be handled next. */
00858         if (c == 9 && completionCallback != NULL) {
00859             c = completeLine(&l);
00860             /* Return on errors */
00861             if (c < 0) return l.len;
00862             /* Read next character when 0 */
00863             if (c == 0) continue;
00864         }
00865 
00866         switch(c) {
00867         case ENTER:    /* enter */
00868             history_len--;
00869             free(history[history_len]);
00870             if (mlmode) linenoiseEditMoveEnd(&l);
00871             if (hintsCallback) {
00872                 /* Force a refresh without hints to leave the previous
00873                  * line as the user typed it after a newline. */
00874                 linenoiseHintsCallback *hc = hintsCallback;
00875                 hintsCallback = NULL;
00876                 refreshLine(&l);
00877                 hintsCallback = hc;
00878             }
00879             return (int)l.len;
00880         case CTRL_C:     /* ctrl-c */
00881             errno = EAGAIN;
00882             return -1;
00883         case BACKSPACE:   /* backspace */
00884         case 8:     /* ctrl-h */
00885             linenoiseEditBackspace(&l);
00886             break;
00887         case CTRL_D:     /* ctrl-d, remove char at right of cursor, or if the
00888                             line is empty, act as end-of-file. */
00889             if (l.len > 0) {
00890                 linenoiseEditDelete(&l);
00891             } else {
00892                 history_len--;
00893                 free(history[history_len]);
00894                 return -1;
00895             }
00896             break;
00897         case CTRL_T:    /* ctrl-t, swaps current character with previous. */
00898             if (l.pos > 0 && l.pos < l.len) {
00899                 int aux = buf[l.pos-1];
00900                 buf[l.pos-1] = buf[l.pos];
00901                 buf[l.pos] = aux;
00902                 if (l.pos != l.len-1) l.pos++;
00903                 refreshLine(&l);
00904             }
00905             break;
00906         case CTRL_B:     /* ctrl-b */
00907             linenoiseEditMoveLeft(&l);
00908             break;
00909         case CTRL_F:     /* ctrl-f */
00910             linenoiseEditMoveRight(&l);
00911             break;
00912         case CTRL_P:    /* ctrl-p */
00913             linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
00914             break;
00915         case CTRL_N:    /* ctrl-n */
00916             linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
00917             break;
00918         case ESC:    /* escape sequence */
00919             /* Read the next two bytes representing the escape sequence.
00920              * Use two calls to handle slow terminals returning the two
00921              * chars at different times. */
00922             if (read(l.ifd,seq,1) == -1) break;
00923             if (read(l.ifd,seq+1,1) == -1) break;
00924 
00925             /* ESC [ sequences. */
00926             if (seq[0] == '[') {
00927                 if (seq[1] >= '0' && seq[1] <= '9') {
00928                     /* Extended escape, read additional byte. */
00929                     if (read(l.ifd,seq+2,1) == -1) break;
00930                     if (seq[2] == '~') {
00931                         switch(seq[1]) {
00932                         case '3': /* Delete key. */
00933                             linenoiseEditDelete(&l);
00934                             break;
00935                         }
00936                     }
00937                 } else {
00938                     switch(seq[1]) {
00939                     case 'A': /* Up */
00940                         linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
00941                         break;
00942                     case 'B': /* Down */
00943                         linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
00944                         break;
00945                     case 'C': /* Right */
00946                         linenoiseEditMoveRight(&l);
00947                         break;
00948                     case 'D': /* Left */
00949                         linenoiseEditMoveLeft(&l);
00950                         break;
00951                     case 'H': /* Home */
00952                         linenoiseEditMoveHome(&l);
00953                         break;
00954                     case 'F': /* End*/
00955                         linenoiseEditMoveEnd(&l);
00956                         break;
00957                     }
00958                 }
00959             }
00960 
00961             /* ESC O sequences. */
00962             else if (seq[0] == 'O') {
00963                 switch(seq[1]) {
00964                 case 'H': /* Home */
00965                     linenoiseEditMoveHome(&l);
00966                     break;
00967                 case 'F': /* End*/
00968                     linenoiseEditMoveEnd(&l);
00969                     break;
00970                 }
00971             }
00972             break;
00973         default:
00974             if (linenoiseEditInsert(&l,c)) return -1;
00975             break;
00976         case CTRL_U: /* Ctrl+u, delete the whole line. */
00977             buf[0] = '\0';
00978             l.pos = l.len = 0;
00979             refreshLine(&l);
00980             break;
00981         case CTRL_K: /* Ctrl+k, delete from current to end of line. */
00982             buf[l.pos] = '\0';
00983             l.len = l.pos;
00984             refreshLine(&l);
00985             break;
00986         case CTRL_A: /* Ctrl+a, go to the start of the line */
00987             linenoiseEditMoveHome(&l);
00988             break;
00989         case CTRL_E: /* ctrl+e, go to the end of the line */
00990             linenoiseEditMoveEnd(&l);
00991             break;
00992         case CTRL_L: /* ctrl+l, clear screen */
00993             linenoiseClearScreen();
00994             refreshLine(&l);
00995             break;
00996         case CTRL_W: /* ctrl+w, delete previous word */
00997             linenoiseEditDeletePrevWord(&l);
00998             break;
00999         }
01000     }
01001     return l.len;
01002 }
01003 
01004 /* This special mode is used by linenoise in order to print scan codes
01005  * on screen for debugging / development purposes. It is implemented
01006  * by the linenoise_example program using the --keycodes option. */
01007 void linenoisePrintKeyCodes(void) {
01008     char quit[4];
01009 
01010     printf("Linenoise key codes debugging mode.\n"
01011             "Press keys to see scan codes. Type 'quit' at any time to exit.\n");
01012     if (enableRawMode(STDIN_FILENO, 1) == -1) return;
01013     memset(quit,' ',4);
01014     while(1) {
01015         char c;
01016         int nread;
01017 
01018         nread = read(STDIN_FILENO,&c,1);
01019         if (nread <= 0) continue;
01020         memmove(quit,quit+1,sizeof(quit)-1); /* shift string to left. */
01021         quit[sizeof(quit)-1] = c; /* Insert current char on the right. */
01022         if (memcmp(quit,"quit",sizeof(quit)) == 0) break;
01023 
01024         printf("'%c' %02x (%d) (type quit to exit)\n",
01025             isprint(c) ? c : '?', (int)c, (int)c);
01026         printf("\r"); /* Go left edge manually, we are in raw mode. */
01027         fflush(stdout);
01028     }
01029     disableRawMode(STDIN_FILENO, 1);
01030 }
01031 
01032 /* This function calls the line editing function linenoiseEdit() using
01033  * the STDIN file descriptor set in raw mode. */
01034 static int linenoiseRaw(char *buf, size_t buflen, const char *prompt) {
01035     int count;
01036 
01037     if (buflen == 0) {
01038         errno = EINVAL;
01039         return -1;
01040     }
01041 
01042     if (enableRawMode(STDIN_FILENO, 0) == -1) return -1;
01043     count = linenoiseEdit(STDIN_FILENO, STDOUT_FILENO, buf, buflen, prompt);
01044     disableRawMode(STDIN_FILENO, 1);
01045     printf("\n");
01046     return count;
01047 }
01048 
01049 /* This function is called when linenoise() is called with the standard
01050  * input file descriptor not attached to a TTY. So for example when the
01051  * program using linenoise is called in pipe or with a file redirected
01052  * to its standard input. In this case, we want to be able to return the
01053  * line regardless of its length (by default we are limited to 4k). */
01054 static char *linenoiseNoTTY(void) {
01055     char *line = NULL;
01056     size_t len = 0, maxlen = 0;
01057 
01058     while(1) {
01059         if (len == maxlen) {
01060             if (maxlen == 0) maxlen = 16;
01061             maxlen *= 2;
01062             char *oldval = line;
01063             line = realloc(line,maxlen);
01064             if (line == NULL) {
01065                 if (oldval) free(oldval);
01066                 return NULL;
01067             }
01068         }
01069         int c = fgetc(stdin);
01070         if (c == EOF || c == '\n') {
01071             if (c == EOF && len == 0) {
01072                 free(line);
01073                 return NULL;
01074             } else {
01075                 line[len] = '\0';
01076                 return line;
01077             }
01078         } else {
01079             line[len] = c;
01080             len++;
01081         }
01082     }
01083 }
01084 
01085 /* The high level function that is the main API of the linenoise library.
01086  * This function checks if the terminal has basic capabilities, just checking
01087  * for a blacklist of stupid terminals, and later either calls the line
01088  * editing function or uses dummy fgets() so that you will be able to type
01089  * something even in the most desperate of the conditions. */
01090 char *linenoise(const char *prompt) {
01091     char buf[LINENOISE_MAX_LINE];
01092     int count;
01093 
01094     if (!isatty(STDIN_FILENO)) {
01095         /* Not a tty: read from file / pipe. In this mode we don't want any
01096          * limit to the line size, so we call a function to handle that. */
01097         return linenoiseNoTTY();
01098     } else if (isUnsupportedTerm()) {
01099         size_t len;
01100 
01101         printf("%s",prompt);
01102         fflush(stdout);
01103         if (fgets(buf,LINENOISE_MAX_LINE,stdin) == NULL) return NULL;
01104         len = strlen(buf);
01105         while(len && (buf[len-1] == '\n' || buf[len-1] == '\r')) {
01106             len--;
01107             buf[len] = '\0';
01108         }
01109         return strdup(buf);
01110     } else {
01111         count = linenoiseRaw(buf,LINENOISE_MAX_LINE,prompt);
01112         if (count == -1) return NULL;
01113         return strdup(buf);
01114     }
01115 }
01116 
01117 /* This is just a wrapper the user may want to call in order to make sure
01118  * the linenoise returned buffer is freed with the same allocator it was
01119  * created with. Useful when the main program is using an alternative
01120  * allocator. */
01121 void linenoiseFree(void *ptr) {
01122     free(ptr);
01123 }
01124 
01125 /* ================================ History ================================= */
01126 
01127 /* Free the history, but does not reset it. Only used when we have to
01128  * exit() to avoid memory leaks are reported by valgrind & co. */
01129 static void freeHistory(void) {
01130     if (history) {
01131         int j;
01132 
01133         for (j = 0; j < history_len; j++)
01134             free(history[j]);
01135         free(history);
01136     }
01137 }
01138 
01139 /* At exit we'll try to fix the terminal to the initial conditions. */
01140 static void linenoiseAtExit(void) {
01141     disableRawMode(STDIN_FILENO, 1);
01142     freeHistory();
01143 }
01144 
01145 /* This is the API call to add a new entry in the linenoise history.
01146  * It uses a fixed array of char pointers that are shifted (memmoved)
01147  * when the history max length is reached in order to remove the older
01148  * entry and make room for the new one, so it is not exactly suitable for huge
01149  * histories, but will work well for a few hundred of entries.
01150  *
01151  * Using a circular buffer is smarter, but a bit more complex to handle. */
01152 int linenoiseHistoryAdd(const char *line) {
01153     char *linecopy;
01154 
01155     if (history_max_len == 0) return 0;
01156 
01157     /* Initialization on first call. */
01158     if (history == NULL) {
01159         history = malloc(sizeof(char*)*history_max_len);
01160         if (history == NULL) return 0;
01161         memset(history,0,(sizeof(char*)*history_max_len));
01162     }
01163 
01164     /* Don't add duplicated lines. */
01165     if (history_len && !strcmp(history[history_len-1], line)) return 0;
01166 
01167     /* Add an heap allocated copy of the line in the history.
01168      * If we reached the max length, remove the older line. */
01169     linecopy = strdup(line);
01170     if (!linecopy) return 0;
01171     if (history_len == history_max_len) {
01172         free(history[0]);
01173         memmove(history,history+1,sizeof(char*)*(history_max_len-1));
01174         history_len--;
01175     }
01176     history[history_len] = linecopy;
01177     history_len++;
01178     return 1;
01179 }
01180 
01181 /* Set the maximum length for the history. This function can be called even
01182  * if there is already some history, the function will make sure to retain
01183  * just the latest 'len' elements if the new history length value is smaller
01184  * than the amount of items already inside the history. */
01185 int linenoiseHistorySetMaxLen(int len) {
01186     char **new;
01187 
01188     if (len < 1) return 0;
01189     if (history) {
01190         int tocopy = history_len;
01191 
01192         new = malloc(sizeof(char*)*len);
01193         if (new == NULL) return 0;
01194 
01195         /* If we can't copy everything, free the elements we'll not use. */
01196         if (len < tocopy) {
01197             int j;
01198 
01199             for (j = 0; j < tocopy-len; j++) free(history[j]);
01200             tocopy = len;
01201         }
01202         memset(new,0,sizeof(char*)*len);
01203         memcpy(new,history+(history_len-tocopy), sizeof(char*)*tocopy);
01204         free(history);
01205         history = new;
01206     }
01207     history_max_len = len;
01208     if (history_len > history_max_len)
01209         history_len = history_max_len;
01210     return 1;
01211 }
01212 
01213 /* Save the history in the specified file. On success 0 is returned
01214  * otherwise -1 is returned. */
01215 int linenoiseHistorySave(const char *filename) {
01216     mode_t old_umask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
01217     FILE *fp;
01218     int j;
01219 
01220     fp = fopen(filename,"w");
01221     umask(old_umask);
01222     if (fp == NULL) return -1;
01223     chmod(filename,S_IRUSR|S_IWUSR);
01224     for (j = 0; j < history_len; j++)
01225         fprintf(fp,"%s\n",history[j]);
01226     fclose(fp);
01227     return 0;
01228 }
01229 
01230 /* Load the history from the specified file. If the file does not exist
01231  * zero is returned and no operation is performed.
01232  *
01233  * If the file exists and the operation succeeded 0 is returned, otherwise
01234  * on error -1 is returned. */
01235 int linenoiseHistoryLoad(const char *filename) {
01236     FILE *fp = fopen(filename,"r");
01237     char buf[LINENOISE_MAX_LINE];
01238 
01239     if (fp == NULL) return -1;
01240 
01241     while (fgets(buf,LINENOISE_MAX_LINE,fp) != NULL) {
01242         char *p;
01243 
01244         p = strchr(buf,'\r');
01245         if (!p) p = strchr(buf,'\n');
01246         if (p) *p = '\0';
01247         linenoiseHistoryAdd(buf);
01248     }
01249     fclose(fp);
01250     return 0;
01251 }

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