linenoise/liblinenoise.c
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/* 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/msteveb/linenoise * (forked from 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, Salvatore Sanfilippo <antirez at gmail dot com> * Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com> * Copyright (c) 2011, Steve Bennett <steveb at workware dot net dot au> * * 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 * * Bloat: * - Completion? * * Unix/termios * ------------ * List of escape sequences used by this program, we do everything just * a few 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 of n chars * * CR (Carriage Return) * Sequence: \r * Effect: moves cursor to column 1 * * The following are used to clear the screen: ESC [ H ESC [ 2 J * This is actually composed of two sequences: * * cursorhome * Sequence: ESC [ H * Effect: moves the cursor to upper left corner * * ED2 (Clear entire screen) * Sequence: ESC [ 2 J * Effect: clear the whole screen * * == For highlighting control characters, we also use the following two == * SO (enter StandOut) * Sequence: ESC [ 7 m * Effect: Uses some standout mode such as reverse video * * SE (Standout End) * Sequence: ESC [ 0 m * Effect: Exit standout mode * * == Only used if TIOCGWINSZ fails == * DSR/CPR (Report cursor position) * Sequence: ESC [ 6 n * Effect: reports current cursor position as ESC [ NNN ; MMM R * * win32/console * ------------- * If __MINGW32__ is defined, the win32 console API is used. * This could probably be made to work for the msvc compiler too. * This support based in part on work by Jon Griffiths. */ #ifdef _WIN32 /* Windows platform, either MinGW or Visual Studio (MSVC) */ #include <windows.h> #include <fcntl.h> #define USE_WINCONSOLE #ifdef __MINGW32__ #define HAVE_UNISTD_H #else /* Microsoft headers don't like old POSIX names */ #define strdup _strdup #define snprintf _snprintf #endif #else #include <termios.h> #include <sys/ioctl.h> #include <sys/poll.h> #define USE_TERMIOS #define HAVE_UNISTD_H #endif #ifdef HAVE_UNISTD_H #include <unistd.h> #endif #include <stdlib.h> #include <stdarg.h> #include <stdio.h> #include <errno.h> #include <string.h> #include <stdlib.h> #include <sys/types.h> #include "linenoise.h" #include "utf8.h" #define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100 #define LINENOISE_MAX_LINE 4096 #define ctrl(C) ((C) - '@') /* Use -ve numbers here to co-exist with normal unicode chars */ enum { SPECIAL_NONE, SPECIAL_UP = -20, SPECIAL_DOWN = -21, SPECIAL_LEFT = -22, SPECIAL_RIGHT = -23, SPECIAL_DELETE = -24, SPECIAL_HOME = -25, SPECIAL_END = -26, SPECIAL_INSERT = -27, SPECIAL_PAGE_UP = -28, SPECIAL_PAGE_DOWN = -29 }; static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN; static int history_len = 0; static char **history = NULL; /* input mode: visible (default), vs. hidden (full, stars) */ static int is_hidden = LN_HIDDEN_NO; /* Structure to contain the status of the current (being edited) line */ struct current { char *buf; /* Current buffer. Always null terminated */ int bufmax; /* Size of the buffer, including space for the null termination */ int len; /* Number of bytes in 'buf' */ int chars; /* Number of chars in 'buf' (utf-8 chars) */ int pos; /* Cursor position, measured in chars */ int cols; /* Size of the window, in chars */ int rows; /* Screen rows */ const char *prompt; char *capture; /* Allocated capture buffer, or NULL for none. Always null terminated */ #if defined(USE_TERMIOS) int fd; /* Terminal fd */ #elif defined(USE_WINCONSOLE) HANDLE outh; /* Console output handle */ HANDLE inh; /* Console input handle */ int x; /* Current column during output */ int y; /* Current row */ #endif }; static int fd_read(struct current *current); static int getWindowSize(struct current *current); void linenoiseHistoryFree(void) { if (history) { int j; for (j = 0; j < history_len; j++) free(history[j]); free(history); history = NULL; history_len = 0; } } #if defined(USE_TERMIOS) static void linenoiseAtExit(void); static struct termios orig_termios; /* in order to restore at exit */ static int rawmode = 0; /* for atexit() function to check if restore is needed*/ static int atexit_registered = 0; /* register atexit just 1 time */ static const char *unsupported_term[] = {"dumb","cons25",NULL}; static int isUnsupportedTerm(void) { char *term = getenv("TERM"); if (term) { int j; for (j = 0; unsupported_term[j]; j++) { if (strcmp(term, unsupported_term[j]) == 0) { return 1; } } } return 0; } static int enableRawMode(struct current *current) { struct termios raw; current->fd = STDIN_FILENO; current->cols = 0; if (!isatty(current->fd) || isUnsupportedTerm() || tcgetattr(current->fd, &orig_termios) == -1) { fatal: errno = ENOTTY; return -1; } if (!atexit_registered) { atexit(linenoiseAtExit); atexit_registered = 1; } 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(current->fd,TCSADRAIN,&raw) < 0) { goto fatal; } rawmode = 1; return 0; } static void disableRawMode(struct current *current) { /* Don't even check the return value as it's too late. */ if (rawmode && tcsetattr(current->fd,TCSADRAIN,&orig_termios) != -1) rawmode = 0; } /* At exit we'll try to fix the terminal to the initial conditions. */ static void linenoiseAtExit(void) { if (rawmode) { tcsetattr(STDIN_FILENO, TCSADRAIN, &orig_termios); } linenoiseHistoryFree(); } /* gcc/glibc insists that we care about the return code of write! * Clarification: This means that a void-cast like "(void) (EXPR)" * does not work. */ #define IGNORE_RC(EXPR) if (EXPR) {} /* This is fdprintf() on some systems, but use a different * name to avoid conflicts */ static void fd_printf(int fd, const char *format, ...) { va_list args; char buf[64]; int n; va_start(args, format); n = vsnprintf(buf, sizeof(buf), format, args); va_end(args); IGNORE_RC(write(fd, buf, n)); } static void clearScreen(struct current *current) { fd_printf(current->fd, "\x1b[H\x1b[2J"); } static void cursorToLeft(struct current *current) { fd_printf(current->fd, "\r"); } static int outputChars(struct current *current, const char *buf, int len) { return write(current->fd, buf, len); } static void outputControlChar(struct current *current, char ch) { fd_printf(current->fd, "\x1b[7m^%c\x1b[0m", ch); } static void eraseEol(struct current *current) { fd_printf(current->fd, "\x1b[0K"); } static void setCursorPos(struct current *current, int x) { fd_printf(current->fd, "\r\x1b[%dC", x); } /** * Reads a char from 'fd', waiting at most 'timeout' milliseconds. * * A timeout of -1 means to wait forever. * * Returns -1 if no char is received within the time or an error occurs. */ static int fd_read_char(int fd, int timeout) { struct pollfd p; unsigned char c; p.fd = fd; p.events = POLLIN; if (poll(&p, 1, timeout) == 0) { /* timeout */ return -1; } if (read(fd, &c, 1) != 1) { return -1; } return c; } /** * Reads a complete utf-8 character * and returns the unicode value, or -1 on error. */ static int fd_read(struct current *current) { #ifdef USE_UTF8 char buf[4]; int n; int i; int c; if (read(current->fd, &buf[0], 1) != 1) { return -1; } n = utf8_charlen(buf[0]); if (n < 1 || n > 3) { return -1; } for (i = 1; i < n; i++) { if (read(current->fd, &buf[i], 1) != 1) { return -1; } } buf[n] = 0; /* decode and return the character */ utf8_tounicode(buf, &c); return c; #else return fd_read_char(current->fd, -1); #endif } static int countColorControlChars(const char* prompt) { /* ANSI color control sequences have the form: * "\x1b" "[" [0-9;]* "m" * We parse them with a simple state machine. */ enum { search_esc, expect_bracket, expect_trail } state = search_esc; int len = 0, found = 0; char ch; /* XXX: Strictly we should be checking utf8 chars rather than * bytes in case of the extremely unlikely scenario where * an ANSI sequence is part of a utf8 sequence. */ while ((ch = *prompt++) != 0) { switch (state) { case search_esc: if (ch == '\x1b') { state = expect_bracket; } break; case expect_bracket: if (ch == '[') { state = expect_trail; /* 3 for "\e[ ... m" */ len = 3; break; } state = search_esc; break; case expect_trail: if ((ch == ';') || ((ch >= '0' && ch <= '9'))) { /* 0-9, or semicolon */ len++; break; } if (ch == 'm') { found += len; } state = search_esc; break; } } return found; } /** * Stores the current cursor column in '*cols'. * Returns 1 if OK, or 0 if failed to determine cursor pos. */ static int queryCursor(int fd, int* cols, int* rows) { /* control sequence - report cursor location */ fd_printf(fd, "\x1b[6n"); /* Parse the response: ESC [ rows ; cols R */ if (fd_read_char(fd, 100) == 0x1b && fd_read_char(fd, 100) == '[') { int n = 0; while (1) { int ch = fd_read_char(fd, 100); if (ch == ';') { /* Got rows */ if (n != 0 && n < 1000) { *rows = n; } /* Reset accumulator for cols */ n = 0; } else if (ch == 'R') { /* Got cols */ if (n != 0 && n < 1000) { *cols = n; } break; } else if (ch >= 0 && ch <= '9') { n = n * 10 + ch - '0'; } else { break; } } return 1; } return 0; } /** * Updates current->cols with the current window size (width), * and current->rows with the current window rows (height) */ static int getWindowSize(struct current *current) { struct winsize ws; if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0 && ws.ws_col != 0) { current->cols = ws.ws_col; current->rows = ws.ws_row; return 0; } /* Failed to query the window size. Perhaps we are on a serial terminal. * Try to query the width by sending the cursor as far to the right * and reading back the cursor position. * Note that this is only done once per call to linenoise rather than * every time the line is refreshed for efficiency reasons. * * In more detail, we: * (a) request current cursor position, * (b) move cursor far right, far down * (c) request cursor position again, * (d) at last move back to the old position. * This gives us the width without messing with the externally * visible cursor position. * * Console codes: * A up * B down * C right * D left * * For portability we are NOT using the control sequences * ESC [ s * ESC [ u * to save and restore the cursor position, as many terminal * emulators do not honor them. */ if (current->cols == 0) { int herec; int herel; current->cols = 80; current->rows = 25; /* (a) */ if (queryCursor (current->fd, &herec, &herel)) { /* (b) */ fd_printf(current->fd, "\x1b[999C\x1b[999B"); /* (c). Note: If (a) succeeded, then (c) should as well. * For paranoia we still check and have a fallback action * for (d) in case of failure.. */ if (!queryCursor (current->fd, ¤t->cols, ¤t->rows)) { /* (d') Unable to get accurate position data, reset * the cursor to the far left. While this may not * restore the exact original position it should not * be too bad. We will have lost the vertical position * however. */ fd_printf(current->fd, "\r"); } else { /* (d) Reset the cursor back to the original location. */ if (current->cols > herec) { fd_printf(current->fd, "\x1b[%dD", current->cols - herec); } if (current->rows > herel) { fd_printf(current->fd, "\x1b[%dA", current->rows - herel); } } } /* 1st query failed, doing nothing => default 80 */ } return 0; } /** * If escape (27) was received, reads subsequent * chars to determine if this is a known special key. * * Returns SPECIAL_NONE if unrecognised, or -1 if EOF. * * If no additional char is received within a short time, * 27 is returned. */ static int check_special(int fd) { int c = fd_read_char(fd, 50); int c2; if (c < 0) { return 27; } c2 = fd_read_char(fd, 50); if (c2 < 0) { return c2; } if (c == '[' || c == 'O') { /* Potential arrow key */ switch (c2) { case 'A': return SPECIAL_UP; case 'B': return SPECIAL_DOWN; case 'C': return SPECIAL_RIGHT; case 'D': return SPECIAL_LEFT; case 'F': return SPECIAL_END; case 'H': return SPECIAL_HOME; } } if (c == '[' && c2 >= '1' && c2 <= '8') { /* extended escape */ c = fd_read_char(fd, 50); if (c == '~') { switch (c2) { case '2': return SPECIAL_INSERT; case '3': return SPECIAL_DELETE; case '5': return SPECIAL_PAGE_UP; case '6': return SPECIAL_PAGE_DOWN; case '7': return SPECIAL_HOME; case '8': return SPECIAL_END; } } while (c != -1 && c != '~') { /* .e.g \e[12~ or '\e[11;2~ discard the complete sequence */ c = fd_read_char(fd, 50); } } return SPECIAL_NONE; } #elif defined(USE_WINCONSOLE) static DWORD orig_consolemode = 0; static int enableRawMode(struct current *current) { DWORD n; INPUT_RECORD irec; current->outh = GetStdHandle(STD_OUTPUT_HANDLE); current->inh = GetStdHandle(STD_INPUT_HANDLE); if (!PeekConsoleInput(current->inh, &irec, 1, &n)) { return -1; } if (getWindowSize(current) != 0) { return -1; } if (GetConsoleMode(current->inh, &orig_consolemode)) { SetConsoleMode(current->inh, ENABLE_PROCESSED_INPUT); } return 0; } static void disableRawMode(struct current *current) { SetConsoleMode(current->inh, orig_consolemode); } static void clearScreen(struct current *current) { COORD topleft = { 0, 0 }; DWORD n; FillConsoleOutputCharacter(current->outh, ' ', current->cols * current->rows, topleft, &n); FillConsoleOutputAttribute(current->outh, FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN, current->cols * current->rows, topleft, &n); SetConsoleCursorPosition(current->outh, topleft); } static void cursorToLeft(struct current *current) { COORD pos = { 0, (SHORT)current->y }; DWORD n; FillConsoleOutputAttribute(current->outh, FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN, current->cols, pos, &n); current->x = 0; } static int outputChars(struct current *current, const char *buf, int len) { COORD pos = { (SHORT)current->x, (SHORT)current->y }; DWORD n; WriteConsoleOutputCharacter(current->outh, buf, len, pos, &n); current->x += len; return 0; } static void outputControlChar(struct current *current, char ch) { COORD pos = { (SHORT)current->x, (SHORT)current->y }; DWORD n; FillConsoleOutputAttribute(current->outh, BACKGROUND_INTENSITY, 2, pos, &n); outputChars(current, "^", 1); outputChars(current, &ch, 1); } static void eraseEol(struct current *current) { COORD pos = { (SHORT)current->x, (SHORT)current->y }; DWORD n; FillConsoleOutputCharacter(current->outh, ' ', current->cols - current->x, pos, &n); } static void setCursorPos(struct current *current, int x) { COORD pos = { (SHORT)x, (SHORT)current->y }; SetConsoleCursorPosition(current->outh, pos); current->x = x; } static int fd_read(struct current *current) { while (1) { INPUT_RECORD irec; DWORD n; if (WaitForSingleObject(current->inh, INFINITE) != WAIT_OBJECT_0) { break; } if (!ReadConsoleInput (current->inh, &irec, 1, &n)) { break; } if (irec.EventType == KEY_EVENT && irec.Event.KeyEvent.bKeyDown) { KEY_EVENT_RECORD *k = &irec.Event.KeyEvent; if (k->dwControlKeyState & ENHANCED_KEY) { switch (k->wVirtualKeyCode) { case VK_LEFT: return SPECIAL_LEFT; case VK_RIGHT: return SPECIAL_RIGHT; case VK_UP: return SPECIAL_UP; case VK_DOWN: return SPECIAL_DOWN; case VK_INSERT: return SPECIAL_INSERT; case VK_DELETE: return SPECIAL_DELETE; case VK_HOME: return SPECIAL_HOME; case VK_END: return SPECIAL_END; case VK_PRIOR: return SPECIAL_PAGE_UP; case VK_NEXT: return SPECIAL_PAGE_DOWN; } } /* Note that control characters are already translated in AsciiChar */ else if (k->wVirtualKeyCode == VK_CONTROL) continue; else { #ifdef USE_UTF8 return k->uChar.UnicodeChar; #else return k->uChar.AsciiChar; #endif } } } return -1; } static int countColorControlChars(const char* prompt) { /* For windows we assume that there are no embedded ansi color * control sequences. */ return 0; } static int getWindowSize(struct current *current) { CONSOLE_SCREEN_BUFFER_INFO info; if (!GetConsoleScreenBufferInfo(current->outh, &info)) { return -1; } current->cols = info.dwSize.X; current->rows = info.dwSize.Y; if (current->cols <= 0 || current->rows <= 0) { current->cols = 80; current->rows = 25; return -1; } current->y = info.dwCursorPosition.Y; current->x = info.dwCursorPosition.X; return 0; } #endif static int utf8_getchars(char *buf, int c) { #ifdef USE_UTF8 return utf8_fromunicode(buf, c); #else *buf = c; return 1; #endif } /** * Returns the unicode character at the given offset, * or -1 if none. */ static int get_char(struct current *current, int pos) { if (pos >= 0 && pos < current->chars) { int c; int i = utf8_index(current->buf, pos); (void)utf8_tounicode(current->buf + i, &c); return c; } return -1; } static void refreshLine(const char *prompt, struct current *current) { int plen; int pchars; int backup = 0; int i; const char *buf = current->buf; int chars = current->chars; int pos = current->pos; int b; int ch; int n; /* Should intercept SIGWINCH. For now, just get the size every time */ getWindowSize(current); plen = strlen(prompt); pchars = utf8_strlen(prompt, plen); /* Scan the prompt for embedded ansi color control sequences and * discount them as characters/columns. */ pchars -= countColorControlChars(prompt); /* Account for a line which is too long to fit in the window. * Note that control chars require an extra column */ /* How many cols are required to the left of 'pos'? * The prompt, plus one extra for each control char */ n = pchars + utf8_strlen(buf, current->len); b = 0; for (i = 0; i < pos; i++) { b += utf8_tounicode(buf + b, &ch); if (ch < ' ') { n++; } } /* If too many are needed, strip chars off the front of 'buf' * until it fits. Note that if the current char is a control character, * we need one extra col. */ if (current->pos < current->chars && get_char(current, current->pos) < ' ') { n++; } while (n >= current->cols && pos > 0) { b = utf8_tounicode(buf, &ch); if (ch < ' ') { n--; } n--; buf += b; pos--; chars--; } /* Cursor to left edge, then the prompt */ cursorToLeft(current); outputChars(current, prompt, plen); /* Now the current buffer content, but only if not fully hidden */ if (is_hidden != LN_HIDDEN_ALL) { /* Need special handling for control characters. * If we hit 'cols', stop. */ b = 0; /* unwritted bytes */ n = 0; /* How many control chars were written */ for (i = 0; i < chars; i++) { int ch; int w = utf8_tounicode(buf + b, &ch); if (!is_hidden && ch < ' ') { n++; } if (pchars + i + n >= current->cols) { break; } if (is_hidden == LN_HIDDEN_STAR) { /* In hidden/star mode all user-entered characters are * shown as astericks ('*'). This is like control chars, * except for a different translation. */ /* assert (b == 0) */ outputChars(current, "*", 1); buf += w; /* keep b = 0; */ } else if (ch < ' ') { /* A control character, so write the buffer so far */ outputChars(current, buf, b); buf += b + w; b = 0; outputControlChar(current, ch + '@'); if (i < pos) { backup++; } } else { b += w; } } /* if (is_hidden) assert (b==0) */ outputChars(current, buf, b); /* Erase to right, move cursor to original position */ eraseEol(current); setCursorPos(current, pos + pchars + backup); } } static void set_current(struct current *current, const char *str) { strncpy(current->buf, str, current->bufmax); current->buf[current->bufmax - 1] = 0; current->len = strlen(current->buf); current->pos = current->chars = utf8_strlen(current->buf, current->len); } static int has_room(struct current *current, int bytes) { return current->len + bytes < current->bufmax - 1; } /** * Removes the char at 'pos'. * * Returns 1 if the line needs to be refreshed, 2 if not * and 0 if nothing was removed */ static int remove_char(struct current *current, int pos) { if (pos >= 0 && pos < current->chars) { int p1, p2; int ret = 1; p1 = utf8_index(current->buf, pos); p2 = p1 + utf8_index(current->buf + p1, 1); #ifdef USE_TERMIOS /* optimise remove char in the case of removing the last char */ if (current->pos == pos + 1 && current->pos == current->chars) { if (current->buf[pos] >= ' ' && utf8_strlen(current->prompt, -1) + utf8_strlen(current->buf, current->len) < current->cols - 1) { ret = 2; fd_printf(current->fd, "\b \b"); } } #endif /* Move the null char too */ memmove(current->buf + p1, current->buf + p2, current->len - p2 + 1); current->len -= (p2 - p1); current->chars--; if (current->pos > pos) { current->pos--; } return ret; } return 0; } /** * Insert 'ch' at position 'pos' * * Returns 1 if the line needs to be refreshed, 2 if not * and 0 if nothing was inserted (no room) */ static int insert_char(struct current *current, int pos, int ch) { char buf[3]; int n = utf8_getchars(buf, ch); if (has_room(current, n) && pos >= 0 && pos <= current->chars) { int p1, p2; int ret = 1; p1 = utf8_index(current->buf, pos); p2 = p1 + n; #ifdef USE_TERMIOS /* optimise the case where adding a single char to the end and no scrolling is needed */ if (!is_hidden && current->pos == pos && current->chars == pos) { if (ch >= ' ' && utf8_strlen(current->prompt, -1) + utf8_strlen(current->buf, current->len) < current->cols - 1) { IGNORE_RC(write(current->fd, buf, n)); ret = 2; } } #endif memmove(current->buf + p2, current->buf + p1, current->len - p1); memcpy(current->buf + p1, buf, n); current->len += n; current->chars++; if (current->pos >= pos) { current->pos++; } return ret; } return 0; } /** * Captures up to 'n' characters starting at 'pos' for the cut buffer. * * This replaces any existing characters in the cut buffer. */ static void capture_chars(struct current *current, int pos, int n) { if (pos >= 0 && (pos + n - 1) < current->chars) { int p1 = utf8_index(current->buf, pos); int nbytes = utf8_index(current->buf + p1, n); if (nbytes) { free(current->capture); /* Include space for the null terminator */ current->capture = (char *)malloc(nbytes + 1); memcpy(current->capture, current->buf + p1, nbytes); current->capture[nbytes] = '\0'; } } } /** * Removes up to 'n' characters at cursor position 'pos'. * * Returns 0 if no chars were removed or non-zero otherwise. */ static int remove_chars(struct current *current, int pos, int n) { int removed = 0; /* First save any chars which will be removed */ capture_chars(current, pos, n); while (n-- && remove_char(current, pos)) { removed++; } return removed; } /** * Inserts the characters (string) 'chars' at the cursor position 'pos'. * * Returns 0 if no chars were inserted or non-zero otherwise. */ static int insert_chars(struct current *current, int pos, const char *chars) { int inserted = 0; while (*chars) { int ch; int n = utf8_tounicode(chars, &ch); if (insert_char(current, pos, ch) == 0) { break; } inserted++; pos++; chars += n; } return inserted; } #ifndef NO_COMPLETION static linenoiseCompletionCallback *completionCallback = NULL; static void beep() { #ifdef USE_TERMIOS fprintf(stderr, "\x7"); fflush(stderr); #endif } static void freeCompletions(linenoiseCompletions *lc) { size_t i; for (i = 0; i < lc->len; i++) free(lc->cvec[i]); free(lc->cvec); } static int completeLine(struct current *current) { linenoiseCompletions lc = { 0, NULL }; int c = 0; completionCallback(current->buf,&lc); if (lc.len == 0) { beep(); } else { size_t stop = 0, i = 0; while(!stop) { /* Show completion or original buffer */ if (i < lc.len) { struct current tmp = *current; tmp.buf = lc.cvec[i]; tmp.pos = tmp.len = strlen(tmp.buf); tmp.chars = utf8_strlen(tmp.buf, tmp.len); refreshLine(current->prompt, &tmp); } else { refreshLine(current->prompt, current); } c = fd_read(current); if (c == -1) { break; } switch(c) { case '\t': /* tab */ i = (i+1) % (lc.len+1); if (i == lc.len) beep(); break; case 27: /* escape */ /* Re-show original buffer */ if (i < lc.len) { refreshLine(current->prompt, current); } stop = 1; break; default: /* Update buffer and return */ if (i < lc.len) { set_current(current,lc.cvec[i]); } stop = 1; break; } } } freeCompletions(&lc); return c; /* Return last read character */ } /* Register a callback function to be called for tab-completion. Returns the prior callback so that the caller may (if needed) restore it when done. */ linenoiseCompletionCallback * linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn) { linenoiseCompletionCallback * old = completionCallback; completionCallback = fn; return old; } void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) { lc->cvec = (char **)realloc(lc->cvec,sizeof(char*)*(lc->len+1)); lc->cvec[lc->len++] = strdup(str); } #endif static int linenoiseEdit(struct current *current) { int history_index = 0; /* The latest history entry is always our current buffer, that * initially is just an empty string. */ linenoiseHistoryAdd(""); set_current(current, ""); refreshLine(current->prompt, current); while(1) { int dir = -1; int c = fd_read(current); #ifndef NO_COMPLETION /* Completion is forbidden for hidden input mode. * 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 == '\t' && !is_hidden && current->pos == current->chars && completionCallback != NULL) { c = completeLine(current); /* Return on errors */ if (c < 0) return current->len; /* Read next character when 0 */ if (c == 0) continue; } #endif process_char: if (c == -1) return current->len; #ifdef USE_TERMIOS if (c == 27) { /* escape sequence */ c = check_special(current->fd); } #endif switch(c) { case '\r': /* enter */ history_len--; free(history[history_len]); return current->len; case ctrl('C'): /* ctrl-c */ errno = EAGAIN; return -1; case 127: /* backspace */ case ctrl('H'): if (remove_char(current, current->pos - 1) == 1) { refreshLine(current->prompt, current); } break; case ctrl('D'): /* ctrl-d */ if (current->len == 0) { /* Empty line, so EOF */ history_len--; free(history[history_len]); return -1; } /* Otherwise fall through to delete char to right of cursor */ case SPECIAL_DELETE: if (remove_char(current, current->pos) == 1) { refreshLine(current->prompt, current); } break; case SPECIAL_INSERT: /* Ignore. Expansion Hook. * Future possibility: Toggle Insert/Overwrite Modes */ break; case ctrl('W'): /* ctrl-w, delete word at left. save deleted chars */ /* eat any spaces on the left */ { int pos = current->pos; while (pos > 0 && get_char(current, pos - 1) == ' ') { pos--; } /* now eat any non-spaces on the left */ while (pos > 0 && get_char(current, pos - 1) != ' ') { pos--; } if (remove_chars(current, pos, current->pos - pos)) { refreshLine(current->prompt, current); } } break; case ctrl('R'): /* ctrl-r */ /* Hidden input mode disables use of the history */ if (!is_hidden) { /* Display the reverse-i-search prompt and process chars */ char rbuf[50]; char rprompt[80]; int rchars = 0; int rlen = 0; int searchpos = history_len - 1; rbuf[0] = 0; while (1) { int n = 0; const char *p = NULL; int skipsame = 0; int searchdir = -1; snprintf(rprompt, sizeof(rprompt), "(reverse-i-search)'%s': ", rbuf); refreshLine(rprompt, current); c = fd_read(current); if (c == ctrl('H') || c == 127) { if (rchars) { int p = utf8_index(rbuf, --rchars); rbuf[p] = 0; rlen = strlen(rbuf); } continue; } #ifdef USE_TERMIOS if (c == 27) { c = check_special(current->fd); } #endif if (c == ctrl('P') || c == SPECIAL_UP) { /* Search for the previous (earlier) match */ if (searchpos > 0) { searchpos--; } skipsame = 1; } else if (c == ctrl('N') || c == SPECIAL_DOWN) { /* Search for the next (later) match */ if (searchpos < history_len) { searchpos++; } searchdir = 1; skipsame = 1; } else if (c >= ' ') { if (rlen >= (int)sizeof(rbuf) + 3) { continue; } n = utf8_getchars(rbuf + rlen, c); rlen += n; rchars++; rbuf[rlen] = 0; /* Adding a new char resets the search location */ searchpos = history_len - 1; } else { /* Exit from incremental search mode */ break; } /* Now search through the history for a match */ for (; searchpos >= 0 && searchpos < history_len; searchpos += searchdir) { p = strstr(history[searchpos], rbuf); if (p) { /* Found a match */ if (skipsame && strcmp(history[searchpos], current->buf) == 0) { /* But it is identical, so skip it */ continue; } /* Copy the matching line and set the cursor position */ set_current(current,history[searchpos]); current->pos = utf8_strlen(history[searchpos], p - history[searchpos]); break; } } if (!p && n) { /* No match, so don't add it */ rchars--; rlen -= n; rbuf[rlen] = 0; } } if (c == ctrl('G') || c == ctrl('C')) { /* ctrl-g terminates the search with no effect */ set_current(current, ""); c = 0; } else if (c == ctrl('J')) { /* ctrl-j terminates the search leaving the buffer in place */ c = 0; } /* Go process the char normally */ refreshLine(current->prompt, current); goto process_char; } break; case ctrl('T'): /* ctrl-t */ if (current->pos > 0 && current->pos <= current->chars) { /* If cursor is at end, transpose the previous two chars */ int fixer = (current->pos == current->chars); c = get_char(current, current->pos - fixer); remove_char(current, current->pos - fixer); insert_char(current, current->pos - 1, c); refreshLine(current->prompt, current); } break; case ctrl('V'): /* ctrl-v */ if (has_room(current, 3)) { /* Insert the ^V first */ if (insert_char(current, current->pos, c)) { refreshLine(current->prompt, current); /* Now wait for the next char. Can insert anything except \0 */ c = fd_read(current); /* Remove the ^V first */ remove_char(current, current->pos - 1); if (c != -1) { /* Insert the actual char */ insert_char(current, current->pos, c); } refreshLine(current->prompt, current); } } break; case ctrl('B'): case SPECIAL_LEFT: if (current->pos > 0) { current->pos--; refreshLine(current->prompt, current); } break; case ctrl('F'): case SPECIAL_RIGHT: if (current->pos < current->chars) { current->pos++; refreshLine(current->prompt, current); } break; case SPECIAL_PAGE_UP: dir = history_len - history_index - 1; /* move to start of history */ goto history_navigation; case SPECIAL_PAGE_DOWN: dir = -history_index; /* move to 0 == end of history, i.e. current */ goto history_navigation; case ctrl('P'): case SPECIAL_UP: dir = 1; goto history_navigation; case ctrl('N'): case SPECIAL_DOWN: history_navigation: /* Hidden input mode disables use of the history */ if (!is_hidden && history_len > 1) { /* Update the current history entry before to * overwrite it with tne next one. */ free(history[history_len - 1 - history_index]); history[history_len - 1 - history_index] = strdup(current->buf); /* Show the new entry */ history_index += dir; if (history_index < 0) { history_index = 0; break; } else if (history_index >= history_len) { history_index = history_len - 1; break; } set_current(current, history[history_len - 1 - history_index]); refreshLine(current->prompt, current); } break; case ctrl('A'): /* Ctrl+a, go to the start of the line */ case SPECIAL_HOME: current->pos = 0; refreshLine(current->prompt, current); break; case ctrl('E'): /* ctrl+e, go to the end of the line */ case SPECIAL_END: current->pos = current->chars; refreshLine(current->prompt, current); break; case ctrl('U'): /* Ctrl+u, delete to beginning of line, save deleted chars. */ if (remove_chars(current, 0, current->pos)) { refreshLine(current->prompt, current); } break; case ctrl('K'): /* Ctrl+k, delete from current to end of line, save deleted chars. */ if (remove_chars(current, current->pos, current->chars - current->pos)) { refreshLine(current->prompt, current); } break; case ctrl('Y'): /* Ctrl+y, insert saved chars at current position */ if (current->capture && insert_chars(current, current->pos, current->capture)) { refreshLine(current->prompt, current); } break; case ctrl('L'): /* Ctrl+L, clear screen */ clearScreen(current); /* Force recalc of window size for serial terminals */ current->cols = 0; refreshLine(current->prompt, current); break; default: /* Only tab is allowed without ^V */ if (c == '\t' || c >= ' ') { if (insert_char(current, current->pos, c) == 1) { refreshLine(current->prompt, current); } } break; } } return current->len; } int linenoiseColumns(void) { struct current current; enableRawMode (¤t); getWindowSize (¤t); disableRawMode (¤t); return current.cols; } int linenoiseLines(void) { struct current current; enableRawMode (¤t); getWindowSize (¤t); disableRawMode (¤t); return current.rows; } char *linenoise(const char *prompt) { int count; struct current current; char buf[LINENOISE_MAX_LINE]; if (enableRawMode(¤t) == -1) { printf("%s", prompt); fflush(stdout); if (fgets(buf, sizeof(buf), stdin) == NULL) { return NULL; } count = strlen(buf); if (count && buf[count-1] == '\n') { count--; buf[count] = '\0'; } } else { current.buf = buf; current.bufmax = sizeof(buf); current.len = 0; current.chars = 0; current.pos = 0; current.prompt = prompt; current.capture = NULL; count = linenoiseEdit(¤t); disableRawMode(¤t); printf("\n"); free(current.capture); if (count == -1) { return NULL; } } return strdup(buf); } void linenoiseSetHidden(int enable) { is_hidden = enable; } int linenoiseGetHidden(void) { return is_hidden; } /* 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; if (history == NULL) { history = (char **)malloc(sizeof(char*)*history_max_len); if (history == NULL) return 0; memset(history,0,(sizeof(char*)*history_max_len)); } /* do not insert duplicate lines into history */ if (history_len > 0 && strcmp(line, history[history_len - 1]) == 0) { return 0; } 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; } int linenoiseHistoryGetMaxLen(void) { return history_max_len; } int linenoiseHistorySetMaxLen(int len) { char **newHistory; if (len < 1) return 0; if (history) { int tocopy = history_len; newHistory = (char **)malloc(sizeof(char*)*len); if (newHistory == 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(newHistory,0,sizeof(char*)*len); memcpy(newHistory,history+(history_len-tocopy), sizeof(char*)*tocopy); free(history); history = newHistory; } 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++) { const char *str = history[j]; /* Need to encode backslash, nl and cr */ while (*str) { if (*str == '\\') { fputs("\\\\", fp); } else if (*str == '\n') { fputs("\\n", fp); } else if (*str == '\r') { fputs("\\r", fp); } else { fputc(*str, fp); } str++; } fputc('\n', fp); } 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 *src, *dest; /* Decode backslash escaped values */ for (src = dest = buf; *src; src++) { char ch = *src; if (ch == '\\') { src++; if (*src == 'n') { ch = '\n'; } else if (*src == 'r') { ch = '\r'; } else { ch = *src; } } *dest++ = ch; } /* Remove trailing newline */ if (dest != buf && (dest[-1] == '\n' || dest[-1] == '\r')) { dest--; } *dest = 0; linenoiseHistoryAdd(buf); } fclose(fp); return 0; } /* Provide access to the history buffer. * * If 'len' is not NULL, the length is stored in *len. */ char **linenoiseHistory(int *len) { if (len) { *len = history_len; } return history; } |