linenoise-0.7.0: cbits/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 <stdint.h>
#include "linenoise.h"
#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
#define LINENOISE_MAX_LINE (1024*1024) // That will get dynamically allocated
#define LINENOISE_INITIAL_BUFLEN 4096
#define PASTE_FOLD_THRESHOLD 200 // Min bytes to fold a single-line paste.
#define PASTE_FOLD_CONTEXT 8 // Context chars kept around generic folds.
#define PASTE_MAX_BYTES LINENOISE_MAX_LINE
static char *unsupported_term[] = {"dumb","cons25","emacs",NULL};
static linenoiseCompletionCallback *completionCallback = NULL;
static linenoiseHintsCallback *hintsCallback = NULL;
static linenoiseFreeHintsCallback *freeHintsCallback = NULL;
static char *linenoiseReadLine(FILE *fp, int *err);
static char *linenoiseNoTTY(void);
static void refreshLineWithCompletion(struct linenoiseState *ls, linenoiseCompletions *lc, int flags);
static void refreshLineWithFlags(struct linenoiseState *l, int flags);
static void linenoiseFoldClear(struct linenoiseState *l);
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 rawmode_output = STDOUT_FILENO; /* fd used for terminal escapes. */
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;
/* =========================== UTF-8 support ================================ */
/* Return the number of bytes that compose the UTF-8 character starting at
* 'c'. This function assumes a valid UTF-8 encoding and handles the four
* standard byte patterns:
* 0xxxxxxx -> 1 byte (ASCII)
* 110xxxxx -> 2 bytes
* 1110xxxx -> 3 bytes
* 11110xxx -> 4 bytes */
static int utf8ByteLen(char c) {
unsigned char uc = (unsigned char)c;
if ((uc & 0x80) == 0) return 1; /* 0xxxxxxx: ASCII */
if ((uc & 0xE0) == 0xC0) return 2; /* 110xxxxx: 2-byte seq */
if ((uc & 0xF0) == 0xE0) return 3; /* 1110xxxx: 3-byte seq */
if ((uc & 0xF8) == 0xF0) return 4; /* 11110xxx: 4-byte seq */
return 1; /* Fallback for invalid encoding, treat as single byte. */
}
/* Decode a UTF-8 sequence starting at 's' into a Unicode codepoint.
* Returns the codepoint value. Assumes valid UTF-8 encoding. */
static uint32_t utf8DecodeChar(const char *s, size_t *len) {
unsigned char *p = (unsigned char *)s;
uint32_t cp;
if ((*p & 0x80) == 0) {
*len = 1;
return *p;
} else if ((*p & 0xE0) == 0xC0) {
*len = 2;
cp = (*p & 0x1F) << 6;
cp |= (p[1] & 0x3F);
return cp;
} else if ((*p & 0xF0) == 0xE0) {
*len = 3;
cp = (*p & 0x0F) << 12;
cp |= (p[1] & 0x3F) << 6;
cp |= (p[2] & 0x3F);
return cp;
} else if ((*p & 0xF8) == 0xF0) {
*len = 4;
cp = (*p & 0x07) << 18;
cp |= (p[1] & 0x3F) << 12;
cp |= (p[2] & 0x3F) << 6;
cp |= (p[3] & 0x3F);
return cp;
}
*len = 1;
return *p; /* Fallback for invalid sequences. */
}
/* Check if codepoint is a variation selector (emoji style modifiers). */
static int isVariationSelector(uint32_t cp) {
return cp == 0xFE0E || cp == 0xFE0F; /* Text/emoji style */
}
/* Check if codepoint is a skin tone modifier. */
static int isSkinToneModifier(uint32_t cp) {
return cp >= 0x1F3FB && cp <= 0x1F3FF;
}
/* Check if codepoint is Zero Width Joiner. */
static int isZWJ(uint32_t cp) {
return cp == 0x200D;
}
/* Check if codepoint is a Regional Indicator (for flag emoji). */
static int isRegionalIndicator(uint32_t cp) {
return cp >= 0x1F1E6 && cp <= 0x1F1FF;
}
/* Check if codepoint is a combining mark or other zero-width character. */
static int isCombiningMark(uint32_t cp) {
return (cp >= 0x0300 && cp <= 0x036F) || /* Combining Diacriticals */
(cp >= 0x1AB0 && cp <= 0x1AFF) || /* Combining Diacriticals Extended */
(cp >= 0x1DC0 && cp <= 0x1DFF) || /* Combining Diacriticals Supplement */
(cp >= 0x20D0 && cp <= 0x20FF) || /* Combining Diacriticals for Symbols */
(cp >= 0xFE20 && cp <= 0xFE2F); /* Combining Half Marks */
}
/* Check if codepoint extends the previous character (doesn't start a new grapheme). */
static int isGraphemeExtend(uint32_t cp) {
return isVariationSelector(cp) || isSkinToneModifier(cp) ||
isZWJ(cp) || isCombiningMark(cp);
}
/* Decode the UTF-8 codepoint ending at position 'pos' (exclusive) and
* return its value. Also sets *cplen to the byte length of the codepoint. */
static uint32_t utf8DecodePrev(const char *buf, size_t pos, size_t *cplen) {
if (pos == 0) {
*cplen = 0;
return 0;
}
/* Scan backwards to find the start byte. */
size_t i = pos;
do {
i--;
} while (i > 0 && (pos - i) < 4 && ((unsigned char)buf[i] & 0xC0) == 0x80);
*cplen = pos - i;
size_t dummy;
return utf8DecodeChar(buf + i, &dummy);
}
/* Given a buffer and a position, return the byte length of the grapheme
* cluster before that position. A grapheme cluster includes:
* - The base character
* - Any following variation selectors, skin tone modifiers
* - ZWJ sequences (emoji joined by Zero Width Joiner)
* - Regional indicator pairs (flag emoji) */
static size_t utf8PrevCharLen(const char *buf, size_t pos) {
if (pos == 0) return 0;
size_t total = 0;
size_t curpos = pos;
/* First, get the last codepoint. */
size_t cplen;
uint32_t cp = utf8DecodePrev(buf, curpos, &cplen);
if (cplen == 0) return 0;
total += cplen;
curpos -= cplen;
/* If we're at an extending character, we need to find what it extends.
* Keep going back through the grapheme cluster. */
while (curpos > 0) {
size_t prevlen;
uint32_t prevcp = utf8DecodePrev(buf, curpos, &prevlen);
if (prevlen == 0) break;
if (isZWJ(prevcp)) {
/* ZWJ joins two emoji. Include the ZWJ and continue to get
* the preceding character. */
total += prevlen;
curpos -= prevlen;
/* Now get the character before ZWJ. */
prevcp = utf8DecodePrev(buf, curpos, &prevlen);
if (prevlen == 0) break;
total += prevlen;
curpos -= prevlen;
cp = prevcp;
continue; /* Check if there's more extending before this. */
} else if (isGraphemeExtend(cp)) {
/* Current cp is an extending character; include previous. */
total += prevlen;
curpos -= prevlen;
cp = prevcp;
continue;
} else if (isRegionalIndicator(cp) && isRegionalIndicator(prevcp)) {
/* Two regional indicators form a flag. But we need to be careful:
* flags are always pairs, so only join if we're at an even boundary.
* For simplicity, just join one pair. */
total += prevlen;
curpos -= prevlen;
break;
} else {
/* No more extending; we've found the start of the cluster. */
break;
}
}
return total;
}
/* Given a buffer, position and total length, return the byte length of the
* grapheme cluster at the current position. */
static size_t utf8NextCharLen(const char *buf, size_t pos, size_t len) {
if (pos >= len) return 0;
size_t total = 0;
size_t curpos = pos;
/* Get the first codepoint. */
size_t cplen;
uint32_t cp = utf8DecodeChar(buf + curpos, &cplen);
total += cplen;
curpos += cplen;
int isRI = isRegionalIndicator(cp);
/* Consume any extending characters that follow. */
while (curpos < len) {
size_t nextlen;
uint32_t nextcp = utf8DecodeChar(buf + curpos, &nextlen);
if (isZWJ(nextcp) && curpos + nextlen < len) {
/* ZWJ: include it and the following character. */
total += nextlen;
curpos += nextlen;
/* Get the character after ZWJ. */
nextcp = utf8DecodeChar(buf + curpos, &nextlen);
total += nextlen;
curpos += nextlen;
continue; /* Check for more extending after the joined char. */
} else if (isGraphemeExtend(nextcp)) {
/* Variation selector, skin tone, combining mark, etc. */
total += nextlen;
curpos += nextlen;
continue;
} else if (isRI && isRegionalIndicator(nextcp)) {
/* Second regional indicator for a flag pair. */
total += nextlen;
curpos += nextlen;
isRI = 0; /* Only pair once. */
continue;
} else {
break;
}
}
return total;
}
/* Return the display width of a Unicode codepoint. This is a heuristic
* that works for most common cases:
* - Control chars and zero-width: 0 columns
* - Grapheme-extending chars (VS, skin tone, ZWJ): 0 columns
* - ASCII printable: 1 column
* - Wide chars (CJK, emoji, fullwidth): 2 columns
* - Everything else: 1 column
*
* This is not a full wcwidth() implementation, but a minimal heuristic
* that handles emoji and CJK characters reasonably well. */
static int utf8CharWidth(uint32_t cp) {
/* Control characters and combining marks: zero width. */
if (cp < 32 || (cp >= 0x7F && cp < 0xA0)) return 0;
if (isCombiningMark(cp)) return 0;
/* Grapheme-extending characters: zero width.
* These modify the preceding character rather than taking space. */
if (isVariationSelector(cp)) return 0;
if (isSkinToneModifier(cp)) return 0;
if (isZWJ(cp)) return 0;
/* Wide character ranges - these display as 2 columns:
* - CJK Unified Ideographs and Extensions
* - Fullwidth forms
* - Various emoji ranges */
if (cp >= 0x1100 &&
(cp <= 0x115F || /* Hangul Jamo */
cp == 0x2329 || cp == 0x232A || /* Angle brackets */
(cp >= 0x231A && cp <= 0x231B) || /* Watch, Hourglass */
(cp >= 0x23E9 && cp <= 0x23F3) || /* Various symbols */
(cp >= 0x23F8 && cp <= 0x23FA) || /* Various symbols */
(cp >= 0x25AA && cp <= 0x25AB) || /* Small squares */
(cp >= 0x25B6 && cp <= 0x25C0) || /* Play/reverse buttons */
(cp >= 0x25FB && cp <= 0x25FE) || /* Squares */
(cp >= 0x2600 && cp <= 0x26FF) || /* Misc Symbols (sun, cloud, etc) */
(cp >= 0x2700 && cp <= 0x27BF) || /* Dingbats (❤, ✂, etc) */
(cp >= 0x2934 && cp <= 0x2935) || /* Arrows */
(cp >= 0x2B05 && cp <= 0x2B07) || /* Arrows */
(cp >= 0x2B1B && cp <= 0x2B1C) || /* Squares */
cp == 0x2B50 || cp == 0x2B55 || /* Star, circle */
(cp >= 0x2E80 && cp <= 0xA4CF &&
cp != 0x303F) || /* CJK ... Yi */
(cp >= 0xAC00 && cp <= 0xD7A3) || /* Hangul Syllables */
(cp >= 0xF900 && cp <= 0xFAFF) || /* CJK Compatibility Ideographs */
(cp >= 0xFE10 && cp <= 0xFE1F) || /* Vertical forms */
(cp >= 0xFE30 && cp <= 0xFE6F) || /* CJK Compatibility Forms */
(cp >= 0xFF00 && cp <= 0xFF60) || /* Fullwidth Forms */
(cp >= 0xFFE0 && cp <= 0xFFE6) || /* Fullwidth Signs */
(cp >= 0x1F1E6 && cp <= 0x1F1FF) || /* Regional Indicators (flags) */
(cp >= 0x1F300 && cp <= 0x1F64F) || /* Misc Symbols and Emoticons */
(cp >= 0x1F680 && cp <= 0x1F6FF) || /* Transport and Map Symbols */
(cp >= 0x1F900 && cp <= 0x1F9FF) || /* Supplemental Symbols */
(cp >= 0x1FA00 && cp <= 0x1FAFF) || /* Chess, Extended-A */
(cp >= 0x20000 && cp <= 0x2FFFF))) /* CJK Extension B and beyond */
return 2;
return 1; /* Default: single width */
}
/* If s[] points at an ANSI CSI escape sequence (e.g. a color change like
* ESC [ 1 ; 32 m), return its length in bytes. Otherwise return 0.
*
* The caller must have already verified that s[0] == ESC (0x1b). The
* sequence layout follows ECMA-48: ESC '[' , parameter bytes (0x30-0x3f),
* intermediate bytes (0x20-0x2f), and a final byte (0x40-0x7e). */
static size_t ansiEscapeLen(const char *s, size_t len) {
size_t i;
if (len < 2 || s[1] != '[') return 0;
i = 2;
while (i < len && (unsigned char)s[i] >= 0x30 && (unsigned char)s[i] <= 0x3f) i++;
while (i < len && (unsigned char)s[i] >= 0x20 && (unsigned char)s[i] <= 0x2f) i++;
if (i >= len || (unsigned char)s[i] < 0x40 || (unsigned char)s[i] > 0x7e) return 0;
return i + 1;
}
/* Calculate the display width of a UTF-8 string of 'len' bytes.
* This is used for cursor positioning in the terminal.
* Handles grapheme clusters: characters joined by ZWJ contribute 0 width
* after the first character in the sequence.
* ANSI CSI escape sequences (e.g. color codes in the prompt) are treated
* as zero-width. */
static size_t utf8StrWidth(const char *s, size_t len) {
size_t width = 0;
size_t i = 0;
int after_zwj = 0; /* Track if previous char was ZWJ */
while (i < len) {
size_t clen;
uint32_t cp = utf8DecodeChar(s + i, &clen);
/* Skip ANSI CSI escape sequences entirely: they produce no
* glyph, so they must not contribute to the display width.
* Checked before the ZWJ state so a stray ZWJ immediately
* followed by ESC cannot swallow the ESC byte. */
if (cp == 0x1b) {
size_t skip = ansiEscapeLen(s + i, len - i);
if (skip > 0) {
i += skip;
continue;
}
}
if (after_zwj) {
/* Character after ZWJ: don't add width, it's joined.
* But do check for extending chars after it. */
after_zwj = 0;
} else {
width += utf8CharWidth(cp);
}
/* Check if this is a ZWJ - next char will be joined. */
if (isZWJ(cp)) {
after_zwj = 1;
}
i += clen;
}
return width;
}
/* Return the display width of a single UTF-8 character at position 's'. */
static int utf8SingleCharWidth(const char *s, size_t len) {
if (len == 0) return 0;
size_t clen;
uint32_t cp = utf8DecodeChar(s, &clen);
return utf8CharWidth(cp);
}
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->oldrows,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;
/* Test mode: when LINENOISE_ASSUME_TTY is set, skip terminal setup.
* This allows testing via pipes without a real terminal. */
if (getenv("LINENOISE_ASSUME_TTY")) {
rawmode = 1;
return 0;
}
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;
/* Ask the terminal to wrap paste input between ESC[200~ and ESC[201~. */
if (write(rawmode_output, "\x1b[?2004h", 8) == -1) {}
return 0;
fatal:
errno = ENOTTY;
return -1;
}
static void disableRawMode(int fd) {
/* Test mode: nothing to restore. */
if (getenv("LINENOISE_ASSUME_TTY")) {
rawmode = 0;
return;
}
/* Don't even check the return value as it's too late. */
if (rawmode && tcsetattr(fd,TCSAFLUSH,&orig_termios) != -1) {
/* Leave bracketed paste mode when leaving raw mode. */
if (write(rawmode_output, "\x1b[?2004l", 8) == -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;
/* Test mode: use LINENOISE_COLS env var for fixed width. */
char *cols_env = getenv("LINENOISE_COLS");
if (cols_env) return atoi(cols_env);
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];
ls->fold_count = 0;
refreshLineWithFlags(ls,flags);
ls->len = saved.len;
ls->pos = saved.pos;
ls->buf = saved.buf;
ls->fold_count = saved.fold_count;
} 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;
c = 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;
linenoiseFoldClear(ls);
}
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);
}
/* A fold is a display-only replacement for a range in l->buf. The edited
* buffer always keeps the real bytes; refresh code asks linenoiseRenderBuffer()
* for a temporary printable version plus the cursor position inside it. */
struct linenoiseFold {
size_t start;
size_t end;
char display[64];
size_t displaylen;
};
struct linenoiseFolds {
int count;
struct linenoiseFold fold[LINENOISE_MAX_FOLDS];
};
/* Return the number of logical lines in the range. */
static size_t foldCountLines(const char *buf, size_t len) {
size_t lines = 1, j;
for (j = 0; j < len; j++) {
if (buf[j] == '\n') lines++;
}
return lines;
}
/* Return true if the text should be folded: if it contains newlines or is at
* least PASTE_FOLD_THRESHOLD bytes long. */
static int shouldFoldText(const char *buf, size_t len) {
return memchr(buf, '\n', len) != NULL || len >= PASTE_FOLD_THRESHOLD;
}
/* Fill f->display with the text shown instead of the folded range. */
static void foldSetRenderedText(struct linenoiseFold *f, const char *buf) {
size_t hidden = f->end - f->start;
size_t lines = foldCountLines(buf + f->start, hidden);
int n;
if (lines > 1)
n = snprintf(f->display,sizeof(f->display),"[... %zu pasted lines ...]",lines);
else
n = snprintf(f->display,sizeof(f->display),"[... %zu pasted chars ...]",hidden);
if (n < 0) n = 0;
f->displaylen = (size_t)n;
}
/* Populate f with one fold reconstructed from a history entry. History stores
* the real text, but not the original paste boundaries, so we reconstruct
* an approximation of text we want to hide on the fly: if it is long or
* contains newlines. */
static int linenoiseBuildHistoryFold(struct linenoiseState *l, struct linenoiseFold *f) {
f->start = f->end = f->displaylen = 0;
if (l->len == 0 || maskmode) return 0;
if (!shouldFoldText(l->buf,l->len)) return 0;
f->start = 0;
f->end = l->len;
if (l->len > PASTE_FOLD_CONTEXT*2) {
size_t pos = 0, chars = 0;
int nl = 0;
/* We leave (if possible) a few chars on
* the start before the fold, to give context. */
while (pos < l->len && chars < PASTE_FOLD_CONTEXT) {
size_t step = utf8NextCharLen(l->buf,pos,l->len);
if (step == 0 || pos + step > l->len) break;
if (l->buf[pos] == '\n') nl = 1;
pos += step;
chars++;
}
f->start = nl ? 0 : pos;
/* And also on the end side. */
pos = l->len;
chars = 0;
nl = 0;
while (pos > 0 && chars < PASTE_FOLD_CONTEXT) {
size_t step = utf8PrevCharLen(l->buf,pos);
if (step == 0 || step > pos) break;
pos -= step;
if (l->buf[pos] == '\n') nl = 1;
chars++;
}
f->end = nl ? l->len : pos;
if (f->start >= f->end) {
f->start = 0;
f->end = l->len;
}
}
foldSetRenderedText(f,l->buf);
return 1;
}
/* Populate fs with the folds to render for the current buffer. As a side
* effect, the rendered text of each fold is updated. Return 1 if folding
* should be used, or 0 if the buffer should be rendered as-is. */
static int linenoiseGetRenderFolds(struct linenoiseState *l, struct linenoiseFolds *fs) {
int j;
fs->count = 0;
if (l->len == 0 || maskmode) return 0;
for (j = 0; j < l->fold_count; j++) {
struct linenoiseFold *f;
size_t start = l->fold_start[j];
size_t end = l->fold_end[j];
if (start >= end || end > l->len) continue;
f = fs->fold + fs->count++;
f->start = start;
f->end = end;
foldSetRenderedText(f,l->buf);
}
return fs->count != 0;
}
/* Return the freshly allocated string content that is actually displayed in
* the user prompt. It can be the actual edited line, or a special version
* where pasted or multiline history ranges are replaced by their folded
* "[...]" style versions. outpos is l->pos translated into this rendered
* buffer. */
static int linenoiseRenderBuffer(struct linenoiseState *l, char **out, size_t *outlen, size_t *outpos) {
struct linenoiseFolds fs;
size_t len, pos, src, dst;
char *r;
int j, pos_set = 0;
if (!linenoiseGetRenderFolds(l,&fs)) {
/* Keep the refresh code simple: it always owns a temporary render
* buffer, even when the render is identical to the real edit buffer. */
r = malloc(l->len+1);
if (r == NULL) return -1;
memcpy(r,l->buf,l->len);
r[l->len] = '\0';
*out = r;
*outlen = l->len;
*outpos = l->pos;
return 0;
}
/* Gaps are copied as-is, folded ranges are replaced by their markers.
* The bytes inside each [start,end) range stay in l->buf but are not
* emitted to the terminal. */
len = l->len;
for (j = 0; j < fs.count; j++) {
struct linenoiseFold *f = fs.fold+j;
len -= f->end - f->start;
len += f->displaylen;
}
r = malloc(len+1);
if (r == NULL) return -1;
src = dst = 0;
pos = 0;
for (j = 0; j < fs.count; j++) {
struct linenoiseFold *f = fs.fold+j;
size_t gap = f->start - src;
if (!pos_set && l->pos <= f->start) {
pos = dst + (l->pos - src);
pos_set = 1;
}
memcpy(r+dst,l->buf+src,gap);
dst += gap;
if (!pos_set && l->pos < f->end) {
pos = dst + f->displaylen;
pos_set = 1;
}
memcpy(r+dst,f->display,f->displaylen);
dst += f->displaylen;
if (!pos_set && l->pos == f->end) {
pos = dst;
pos_set = 1;
}
src = f->end;
}
if (!pos_set) pos = dst + (l->pos - src);
memcpy(r+dst,l->buf+src,l->len-src);
r[len] = '\0';
*out = r;
*outlen = len;
*outpos = pos;
return 0;
}
/* Return the number of bytes to move right from pos. If pos is at the start of
* a folded range, the whole hidden range is skipped by one cursor movement. */
static size_t linenoiseEditNextLen(struct linenoiseState *l, size_t pos) {
struct linenoiseFolds fs;
int j;
if (linenoiseGetRenderFolds(l,&fs)) {
for (j = 0; j < fs.count; j++) {
if (pos == fs.fold[j].start)
return fs.fold[j].end - fs.fold[j].start;
}
}
return utf8NextCharLen(l->buf,pos,l->len);
}
/* Return the number of bytes to move left from pos. If pos is at the end of a
* folded range, the whole hidden range is skipped by one cursor movement. */
static size_t linenoiseEditPrevLen(struct linenoiseState *l, size_t pos) {
struct linenoiseFolds fs;
int j;
if (linenoiseGetRenderFolds(l,&fs)) {
for (j = 0; j < fs.count; j++) {
if (pos == fs.fold[j].end)
return fs.fold[j].end - fs.fold[j].start;
}
}
return utf8PrevCharLen(l->buf,pos);
}
/* Add a fold range, keeping the array sorted by start offset. */
static void linenoiseFoldAdd(struct linenoiseState *l, size_t start, size_t end) {
int j;
if (start >= end || l->fold_count == LINENOISE_MAX_FOLDS) return;
j = l->fold_count;
while (j > 0 && start < l->fold_start[j-1]) {
l->fold_start[j] = l->fold_start[j-1];
l->fold_end[j] = l->fold_end[j-1];
j--;
}
l->fold_start[j] = start;
l->fold_end[j] = end;
l->fold_count++;
}
/* Clear all remembered fold ranges. */
static void linenoiseFoldClear(struct linenoiseState *l) {
l->fold_count = 0;
}
/* Remove one remembered fold range. */
static void linenoiseFoldRemove(struct linenoiseState *l, int j) {
memmove(l->fold_start+j,l->fold_start+j+1,
sizeof(size_t)*(l->fold_count-j-1));
memmove(l->fold_end+j,l->fold_end+j+1,
sizeof(size_t)*(l->fold_count-j-1));
l->fold_count--;
}
/* Return true if [pos,pos+len) overlaps any folded range. */
static int linenoiseRangeOverlapsFold(struct linenoiseState *l, size_t pos, size_t len) {
size_t end = pos + len;
int j;
for (j = 0; j < l->fold_count; j++) {
if (end > l->fold_start[j] && pos < l->fold_end[j])
return 1;
}
return 0;
}
/* Adjust fold ranges after an insertion. If insertion somehow lands inside a
* fold, remove that fold because it no longer maps to an unchanged range. */
static void linenoiseAdjustFoldsAfterInsert(struct linenoiseState *l, size_t pos, size_t len) {
int j = 0;
while (j < l->fold_count) {
if (pos <= l->fold_start[j]) {
l->fold_start[j] += len;
l->fold_end[j] += len;
j++;
} else if (pos < l->fold_end[j]) {
linenoiseFoldRemove(l,j);
} else {
j++;
}
}
}
/* Adjust fold ranges after a deletion. If deletion overlaps a fold, remove
* that fold because it no longer maps to an unchanged range. */
static void linenoiseAdjustFoldsAfterDelete(struct linenoiseState *l, size_t pos, size_t len) {
size_t end = pos + len;
int j = 0;
while (j < l->fold_count) {
if (end <= l->fold_start[j]) {
l->fold_start[j] -= len;
l->fold_end[j] -= len;
j++;
} else if (pos >= l->fold_end[j]) {
j++;
} else {
linenoiseFoldRemove(l,j);
}
}
}
/* Helper of refreshSingleLine() and refreshMultiLine() to show hints
* to the right of the prompt. Now uses display widths for proper UTF-8. */
void refreshShowHints(struct abuf *ab, struct linenoiseState *l, int pwidth, size_t bufwidth) {
if (hintsCallback) {
char seq[64];
int color = -1, bold = 0;
char *hint;
if (pwidth + bufwidth >= l->cols) return;
hint = hintsCallback(l->buf,&color,&bold);
if (hint) {
size_t hintlen = strlen(hint);
size_t hintwidth = utf8StrWidth(hint, hintlen);
size_t hintmaxwidth = l->cols - (pwidth + bufwidth);
/* Truncate hint to fit, respecting UTF-8 boundaries. */
if (hintwidth > hintmaxwidth) {
size_t i = 0, w = 0;
while (i < hintlen) {
size_t clen = utf8NextCharLen(hint, i, hintlen);
int cwidth = utf8SingleCharWidth(hint + i, clen);
if (w + cwidth > hintmaxwidth) break;
w += cwidth;
i += clen;
}
hintlen = i;
}
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.
*
* This function is UTF-8 aware and uses display widths (not byte counts)
* for cursor positioning and horizontal scrolling. */
static void refreshSingleLine(struct linenoiseState *l, int flags) {
char seq[64];
size_t pwidth = utf8StrWidth(l->prompt, l->plen); /* Prompt display width */
int fd = l->ofd;
char *render = NULL;
char *buf;
size_t len; /* Byte length of buffer to display */
size_t pos; /* Byte position of cursor in display buffer */
size_t poscol; /* Display column of cursor */
size_t lencol; /* Display width of buffer */
size_t fullwidth; /* Display width before horizontal trimming. */
struct abuf ab;
if (linenoiseRenderBuffer(l,&render,&len,&pos) == -1) return;
buf = render;
/* Calculate the display width up to cursor and total display width. */
poscol = utf8StrWidth(buf, pos);
lencol = utf8StrWidth(buf, len);
fullwidth = lencol;
/* Scroll the buffer horizontally if cursor is past the right edge.
* We need to trim full UTF-8 characters from the left until the
* cursor position fits within the terminal width. */
while (pwidth + poscol >= l->cols) {
size_t clen = utf8NextCharLen(buf, 0, len);
int cwidth = utf8SingleCharWidth(buf, clen);
buf += clen;
len -= clen;
pos -= clen;
poscol -= cwidth;
lencol -= cwidth;
}
/* Trim from the right if the line still doesn't fit. */
while (pwidth + lencol > l->cols) {
size_t clen = utf8PrevCharLen(buf, len);
int cwidth = utf8SingleCharWidth(buf + len - clen, clen);
len -= clen;
lencol -= cwidth;
}
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,l->plen);
if (maskmode == 1) {
/* In mask mode, we output one '*' per UTF-8 character, not byte */
size_t i = 0;
while (i < len) {
abAppend(&ab,"*",1);
i += utf8NextCharLen(buf, i, len);
}
} else {
abAppend(&ab,buf,len);
}
/* Show hints if any. */
refreshShowHints(&ab,l,pwidth,fullwidth);
}
/* Erase to right */
snprintf(seq,sizeof(seq),"\x1b[0K");
abAppend(&ab,seq,strlen(seq));
if (flags & REFRESH_WRITE) {
/* Move cursor to original position (using display column, not byte). */
snprintf(seq,sizeof(seq),"\r\x1b[%dC", (int)(poscol+pwidth));
abAppend(&ab,seq,strlen(seq));
}
if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
abFree(&ab);
free(render);
}
/* 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.
*
* This function is UTF-8 aware and uses display widths for positioning. */
static void refreshMultiLine(struct linenoiseState *l, int flags) {
char seq[64];
size_t pwidth = utf8StrWidth(l->prompt, l->plen); /* Prompt display width */
char *render = NULL;
size_t render_len, render_pos;
size_t bufwidth;
size_t poswidth;
int rows; /* rows used by current rendered buffer. */
int rpos = l->oldrpos; /* cursor relative row from previous refresh. */
int rpos2; /* rpos after refresh. */
int col; /* column position, zero-based. */
int old_rows = l->oldrows;
int fd = l->ofd, j;
struct abuf ab;
if (linenoiseRenderBuffer(l,&render,&render_len,&render_pos) == -1) return;
bufwidth = utf8StrWidth(render, render_len);
poswidth = utf8StrWidth(render, render_pos);
rows = (pwidth+bufwidth+l->cols-1)/l->cols;
l->oldrows = 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,l->plen);
if (maskmode == 1) {
/* In mask mode, output one '*' per UTF-8 character, not byte */
size_t i = 0;
while (i < render_len) {
abAppend(&ab,"*",1);
i += utf8NextCharLen(render, i, render_len);
}
} else {
abAppend(&ab,render,render_len);
}
/* Show hints if any. */
refreshShowHints(&ab,l,pwidth,bufwidth);
/* 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 &&
render_pos == render_len &&
(poswidth+pwidth) % l->cols == 0)
{
lndebug("<newline>");
abAppend(&ab,"\n",1);
snprintf(seq,64,"\r");
abAppend(&ab,seq,strlen(seq));
rows++;
if (rows > (int)l->oldrows) l->oldrows = rows;
}
/* Move cursor to right position. */
rpos2 = (pwidth+poswidth+l->cols)/l->cols; /* Current cursor relative row */
lndebug("rpos2 %d", rpos2);
/* Go up till we reach the expected position. */
if (rows-rpos2 > 0) {
lndebug("go-up %d", rows-rpos2);
snprintf(seq,64,"\x1b[%dA", rows-rpos2);
abAppend(&ab,seq,strlen(seq));
}
/* Set column. */
col = (pwidth+poswidth) % 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 (flags & REFRESH_WRITE) l->oldrpos = rpos2;
if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
abFree(&ab);
free(render);
}
/* 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);
}
}
/* Grow the editing buffer if this state owns a growable buffer. Only the
* blocking linenoise() API sets buflen_max: the multiplexing API still uses
* the caller-provided fixed buffer. */
static int linenoiseEditGrow(struct linenoiseState *l, size_t needed) {
size_t newlen;
char *newbuf;
if (needed <= l->buflen) return 0;
/* buflen_max is zero when the caller provided a fixed buffer, as in the
* multiplexing API: in that case there is nothing we can grow. */
if (l->buflen_max == 0 || needed > l->buflen_max) return -1;
/* Grow exponentially, but stop at the configured maximum before the
* doubling would overflow or go past it. */
newlen = l->buflen ? l->buflen : 16;
while (newlen < needed) {
if (newlen > l->buflen_max/2) {
newlen = l->buflen_max;
break;
}
newlen *= 2;
}
if (newlen < needed || newlen == SIZE_MAX) return -1;
/* Allocate one extra byte for the nul terminator. */
newbuf = realloc(l->buf,newlen+1);
if (newbuf == NULL) return -1;
l->buf = newbuf;
l->buflen = newlen;
return 0;
}
/* Insert bytes into l->buf without repainting the prompt. The paste path uses
* this to first store the real pasted bytes, then mark their range as folded,
* and only then refresh so raw pasted newlines are never printed directly. */
static int linenoiseEditInsertNoRefresh(struct linenoiseState *l, const char *c, size_t clen) {
size_t insert_pos = l->pos;
if (clen > SIZE_MAX-l->len || linenoiseEditGrow(l,l->len+clen) == -1)
return -1;
if (l->len == l->pos) {
memcpy(l->buf+l->pos,c,clen);
} else {
memmove(l->buf+l->pos+clen,l->buf+l->pos,l->len-l->pos);
memcpy(l->buf+l->pos,c,clen);
}
l->pos += clen;
l->len += clen;
l->buf[l->len] = '\0';
linenoiseAdjustFoldsAfterInsert(l,insert_pos,clen);
return 0;
}
/* Insert the character(s) 'c' of length 'clen' at cursor current position.
* This handles both single-byte ASCII and multi-byte UTF-8 sequences.
*
* On error writing to the terminal -1 is returned, otherwise 0. */
int linenoiseEditInsert(struct linenoiseState *l, const char *c, size_t clen) {
if (l->len == l->pos) {
int needs_refresh = memchr(c, '\n', clen) != NULL ||
memchr(c, '\r', clen) != NULL;
if (linenoiseEditInsertNoRefresh(l,c,clen) == -1) return 0;
if (!needs_refresh && !mlmode && !hintsCallback &&
(maskmode || l->fold_count == 0))
{
size_t bufwidth = utf8StrWidth(l->buf,l->len);
if (utf8StrWidth(l->prompt,l->plen)+bufwidth < l->cols) {
/* Avoid a full update of the line in the trivial case:
* single-width char, no hints, fits in one line. */
if (maskmode == 1) {
if (write(l->ofd,"*",1) == -1) return -1;
} else {
if (write(l->ofd,c,clen) == -1) return -1;
}
return 0;
}
}
refreshLine(l);
} else {
if (linenoiseEditInsertNoRefresh(l,c,clen) == -1) return 0;
refreshLine(l);
}
return 0;
}
/* Move cursor on the left. Moves by one UTF-8 character, not byte. */
void linenoiseEditMoveLeft(struct linenoiseState *l) {
if (l->pos > 0) {
l->pos -= linenoiseEditPrevLen(l, l->pos);
refreshLine(l);
}
}
/* Move cursor on the right. Moves by one UTF-8 character, not byte. */
void linenoiseEditMoveRight(struct linenoiseState *l) {
if (l->pos != l->len) {
l->pos += linenoiseEditNextLen(l, 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) {
const char *src;
size_t len;
struct linenoiseFold f;
/* 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;
}
/* Copy the selected history entry into the edit buffer. With the
* fixed-buffer API, truncate the entry if it does not fit. */
src = history[history_len - 1 - l->history_index];
len = strlen(src);
if (linenoiseEditGrow(l,len) == -1 && len > l->buflen)
len = l->buflen;
memcpy(l->buf,src,len);
l->buf[len] = '\0';
l->len = l->pos = len;
linenoiseFoldClear(l);
/* History stores the real text, but not the original paste ranges.
* If the recalled entry needs folding, create one display fold now
* so text typed after recall remains outside the folded range. */
if (linenoiseBuildHistoryFold(l,&f))
linenoiseFoldAdd(l,f.start,f.end);
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.
* Now handles multi-byte UTF-8 characters. */
void linenoiseEditDelete(struct linenoiseState *l) {
if (l->len > 0 && l->pos < l->len) {
size_t clen = linenoiseEditNextLen(l, l->pos);
linenoiseAdjustFoldsAfterDelete(l,l->pos,clen);
memmove(l->buf+l->pos, l->buf+l->pos+clen, l->len-l->pos-clen);
l->len -= clen;
l->buf[l->len] = '\0';
refreshLine(l);
}
}
/* Backspace implementation. Deletes the UTF-8 character before the cursor. */
void linenoiseEditBackspace(struct linenoiseState *l) {
if (l->pos > 0 && l->len > 0) {
size_t clen = linenoiseEditPrevLen(l, l->pos);
linenoiseAdjustFoldsAfterDelete(l,l->pos-clen,clen);
memmove(l->buf+l->pos-clen, l->buf+l->pos, l->len-l->pos);
l->pos -= clen;
l->len -= clen;
l->buf[l->len] = '\0';
refreshLine(l);
}
}
/* Delete the previous word, maintaining the cursor at the start of the
* current word. Handles UTF-8 by moving character-by-character. */
void linenoiseEditDeletePrevWord(struct linenoiseState *l) {
size_t old_pos = l->pos;
size_t diff;
/* Skip spaces before the word (move backwards by UTF-8 chars). */
while (l->pos > 0 && l->buf[l->pos-1] == ' ')
l->pos -= linenoiseEditPrevLen(l, l->pos);
/* Skip non-space characters (move backwards by UTF-8 chars). */
while (l->pos > 0 && l->buf[l->pos-1] != ' ')
l->pos -= linenoiseEditPrevLen(l, l->pos);
diff = old_pos - l->pos;
linenoiseAdjustFoldsAfterDelete(l,l->pos,diff);
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->buflen_max = 0;
l->prompt = prompt;
l->plen = strlen(prompt);
l->oldpos = l->pos = 0;
l->len = 0;
linenoiseFoldClear(l);
/* Enter raw mode. */
rawmode_output = l->ofd;
if (enableRawMode(l->ifd) == -1) return -1;
l->cols = getColumns(stdin_fd, stdout_fd);
l->oldrows = 0;
l->oldrpos = 1; /* Cursor starts on row 1. */
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) && !getenv("LINENOISE_ASSUME_TTY")) return 0;
/* 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;
}
/* Make sure the temporary paste buffer can hold len+need bytes. Return -1 on
* allocation failure or if the requested size is over PASTE_MAX_BYTES. */
static int pasteBufferReserve(char **buf, size_t *cap, size_t len, size_t need) {
size_t want;
char *nb;
/* Nothing to do if the current paste buffer already has room for the
* bytes collected so far plus the new bytes we want to append. */
if (*cap >= len + need) return 0;
/* Start small, then double like the line buffer. The cap avoids turning a
* huge paste into an unbounded allocation attempt. */
want = *cap ? *cap : 64;
while (want < len + need) {
size_t doubled = want*2;
if (doubled <= want || doubled > PASTE_MAX_BYTES) {
want = PASTE_MAX_BYTES;
break;
}
want = doubled;
}
if (want < len + need) return -1;
/* realloc(NULL, want) handles the first allocation too. */
nb = realloc(*buf, want);
if (nb == NULL) return -1;
*buf = nb;
*cap = want;
return 0;
}
/* Append bytes to the temporary paste buffer, growing both it and l->buf as
* needed. Return -1 if the paste is too large or allocation fails. */
static int pasteBufferAppend(struct linenoiseState *l, char **buf, size_t *cap,
size_t *len, const char *s, size_t slen, size_t maxlen) {
size_t needed;
if (*len > maxlen || slen > maxlen-*len) return -1;
if (*len > SIZE_MAX-slen) return -1;
needed = *len+slen;
if (l->len > SIZE_MAX-needed) return -1;
if (linenoiseEditGrow(l,l->len+needed) == -1) return -1;
if (pasteBufferReserve(buf,cap,*len,slen) == -1) return -1;
memcpy(*buf+*len,s,slen);
*len = needed;
return 0;
}
/* Read a bracketed paste until ESC[201~ and insert the real bytes. If folding
* is needed, remember the inserted range so only rendering is shortened. */
static void linenoiseEditPaste(struct linenoiseState *l) {
static const char END[] = "\x1b[201~";
const size_t ENDLEN = sizeof(END)-1;
char *buf = NULL;
size_t cap = 0, len = 0, match = 0;
size_t maxlen = l->buflen_max ? l->buflen_max : l->buflen;
int overflowed = 0;
maxlen = maxlen > l->len ? maxlen - l->len : 0;
if (maxlen > PASTE_MAX_BYTES) maxlen = PASTE_MAX_BYTES;
/* Once all fold slots are used, consume later pastes without storing them. */
if (l->fold_count == LINENOISE_MAX_FOLDS) maxlen = 0;
while (1) {
char c;
if (read(l->ifd, &c, 1) != 1) break;
/* Track a possible ESC[201~ terminator without copying it into the
* paste. If it turns out to be ordinary input, flush the partial
* match below. */
if (c == END[match]) {
match++;
if (match == ENDLEN) break;
continue;
}
if (match > 0) {
if (!overflowed &&
pasteBufferAppend(l,&buf,&cap,&len,END,match,maxlen) == -1)
overflowed = 1;
match = 0;
if (c == END[0]) {
match = 1;
continue;
}
}
if (!overflowed &&
pasteBufferAppend(l,&buf,&cap,&len,&c,1,maxlen) == -1)
overflowed = 1;
}
if (overflowed) {
free(buf);
linenoiseBeep();
return;
}
if (buf == NULL) return;
{
/* Normalize pasted CR and CRLF to LF, so the edit buffer uses one
* internal newline representation. */
size_t r = 0, w = 0;
while (r < len) {
if (buf[r] == '\r') {
buf[w++] = '\n';
r += (r+1 < len && buf[r+1] == '\n') ? 2 : 1;
} else {
buf[w++] = buf[r++];
}
}
len = w;
}
if (!maskmode && shouldFoldText(buf,len)) {
size_t start = l->pos;
if (linenoiseEditInsertNoRefresh(l,buf,len) == -1) {
free(buf);
linenoiseBeep();
return;
}
linenoiseFoldAdd(l,start,start+len);
refreshLine(l);
} else {
linenoiseEditInsert(l,buf,len);
}
free(buf);
}
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) && !getenv("LINENOISE_ASSUME_TTY")) return linenoiseNoTTY();
char c;
int nread;
char seq[3];
nread = read(l->ifd,&c,1);
if (nread < 0) {
return (errno == EAGAIN || errno == EWOULDBLOCK) ? linenoiseEditMore : NULL;
} else if (nread == 0) {
return NULL;
}
/* Only autocomplete when the callback is set. completeLine()
* returns the character to be handled next, or zero when the
* key was consumed to navigate completions. */
if ((l->in_completion || c == 9 /* TAB */) && completionCallback != NULL) {
int retval = completeLine(l,c);
/* Read next character when 0 */
if (retval == 0) return linenoiseEditMore;
c = retval;
}
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. */
/* Handle UTF-8: swap the two UTF-8 characters around cursor. */
if (l->pos > 0 && l->pos < l->len) {
char tmp[32];
size_t prevlen = linenoiseEditPrevLen(l, l->pos);
size_t currlen = linenoiseEditNextLen(l, l->pos);
size_t prevstart = l->pos - prevlen;
if (prevlen > sizeof(tmp) || currlen > sizeof(tmp)) break;
if (linenoiseRangeOverlapsFold(l,prevstart,prevlen+currlen)) {
linenoiseBeep();
break;
}
/* Copy current char to tmp, move previous char right, paste tmp. */
memcpy(tmp, l->buf + l->pos, currlen);
memmove(l->buf + prevstart + currlen, l->buf + prevstart, prevlen);
memcpy(l->buf + prevstart, tmp, currlen);
if (l->pos + currlen <= l->len) l->pos += currlen;
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') {
char param[8];
size_t plen = 1;
char final = 0;
param[0] = seq[1];
while (plen < sizeof(param)) {
char p;
if (read(l->ifd,&p,1) != 1) break;
if (p >= '0' && p <= '9') {
param[plen++] = p;
} else {
final = p;
break;
}
}
if (final == '~') {
if (plen == 1 && param[0] == '3') {
linenoiseEditDelete(l);
} else if (plen == 3 && memcmp(param,"200",3) == 0) {
linenoiseEditPaste(l);
}
}
} 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:
/* Handle UTF-8 multi-byte sequences. When we receive the first byte
* of a multi-byte UTF-8 character, read the remaining bytes to
* complete the sequence before inserting. */
{
char utf8[4];
int utf8len = utf8ByteLen(c);
utf8[0] = c;
if (utf8len > 1) {
/* Read remaining bytes of the UTF-8 sequence. */
int i;
for (i = 1; i < utf8len; i++) {
if (read(l->ifd, utf8+i, 1) != 1) break;
}
}
if (linenoiseEditInsert(l, utf8, utf8len)) return NULL;
}
break;
case CTRL_U: /* Ctrl+u, delete the whole line. */
l->buf[0] = '\0';
l->pos = l->len = 0;
linenoiseFoldClear(l);
refreshLine(l);
break;
case CTRL_K: /* Ctrl+k, delete from current to end of line. */
linenoiseAdjustFoldsAfterDelete(l,l->pos,l->len-l->pos);
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) && !getenv("LINENOISE_ASSUME_TTY")) 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. This wrapper owns l.buf, so it can let the edit
* state grow it dynamically for large pasted input. */
static char *linenoiseBlockingEdit(int stdin_fd, int stdout_fd, const char *prompt)
{
struct linenoiseState l;
char *buf = malloc(LINENOISE_INITIAL_BUFLEN);
char *res;
if (buf == NULL) {
errno = ENOMEM;
return NULL;
}
if (linenoiseEditStart(&l,stdin_fd,stdout_fd,buf,
LINENOISE_INITIAL_BUFLEN,prompt) == -1)
{
free(buf);
return NULL;
}
l.buflen_max = LINENOISE_MAX_LINE;
while((res = linenoiseEditFeed(&l)) == linenoiseEditMore);
linenoiseEditStop(&l);
free(l.buf);
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");
rawmode_output = STDOUT_FILENO;
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);
}
/* Read a newline-terminated record from fp with no fixed-size stack buffer.
* Used for non-tty input, unsupported terminals, and history loading. */
static char *linenoiseReadLine(FILE *fp, int *err) {
char *line = NULL;
size_t len = 0, cap = 0;
if (err) *err = 0;
while(1) {
if (len+1 >= cap) {
size_t newcap = cap ? cap*2 : 16;
char *oldval = line;
if (newcap <= cap) {
free(line);
if (err) *err = 1;
errno = ENOMEM;
return NULL;
}
line = realloc(line,newcap);
if (line == NULL) {
if (oldval) free(oldval);
if (err) *err = 1;
return NULL;
}
cap = newcap;
}
int c = fgetc(fp);
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++;
}
}
}
/* 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. */
static char *linenoiseNoTTY(void) {
return linenoiseReadLine(stdin,NULL);
}
/* 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 a simple line reader so that you will be able
* to type something even in the most desperate of the conditions. */
char *linenoise(const char *prompt) {
if (!isatty(STDIN_FILENO) && !getenv("LINENOISE_ASSUME_TTY")) {
/* 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();
}
if (isUnsupportedTerm()) {
char *retval;
size_t len;
printf("%s",prompt);
fflush(stdout);
retval = linenoiseNoTTY();
if (retval == NULL) return NULL;
len = strlen(retval);
while(len && retval[len-1] == '\r') {
len--;
retval[len] = '\0';
}
return retval;
} else {
return linenoiseBlockingEdit(STDIN_FILENO,STDOUT_FILENO,prompt);
}
}
/* 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;
fchmod(fileno(fp),S_IRUSR|S_IWUSR);
for (j = 0; j < history_len; j++) {
char *p = history[j];
/* Keep the history file newline-separated: embedded newlines in an
* entry are stored as CR and converted back by linenoiseHistoryLoad(). */
while (*p) {
fputc(*p == '\n' ? '\r' : *p, fp);
p++;
}
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;
int err = 0;
if (fp == NULL) return -1;
while ((buf = linenoiseReadLine(fp,&err)) != NULL) {
size_t j;
/* Rebuild embedded newlines that were saved as CR. */
for (j = 0; buf[j]; j++) {
if (buf[j] == '\r') buf[j] = '\n';
}
linenoiseHistoryAdd(buf);
free(buf);
}
if (err || ferror(fp)) {
fclose(fp);
return -1;
}
fclose(fp);
return 0;
}