tisp

Unnamed repository; edit this file 'description' to name the repository.
git clone git://edryd.org/tisp
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commit ec1b1338332e718eb9d7a88d90810a02cdf8af72
Author: Ed van Bruggen <ed@edryd.org>
Date:   Mon, 19 Feb 2018 00:30:04 -0800

Initial commit

Diffstat:
.gitignore | 21+++++++++++++++++++++
LICENSE | 19+++++++++++++++++++
Makefile | 73+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
README.md | 34++++++++++++++++++++++++++++++++++
config.def.h | 2++
config.mk | 18++++++++++++++++++
extern/arg.h | 63+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
extern/linenoise.c | 1199+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
extern/linenoise.h | 73+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
tisp.1 | 35+++++++++++++++++++++++++++++++++++
tisp.c | 546+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
util.c | 75+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
util.h | 14++++++++++++++
13 files changed, 2172 insertions(+), 0 deletions(-)

diff --git a/.gitignore b/.gitignore @@ -0,0 +1,21 @@ +# swap files +*~ +*.swp +*.swo +\#*\# + +# compiled files +tisp +*.exe +*.out +*.app +*.i*86 +*.x86_64 +*.o +*.obj +*.so +*.so.* + +# misc +tags +config.h diff --git a/LICENSE b/LICENSE @@ -0,0 +1,19 @@ +zlib License + +Copyright (c) 2017-2018 Ed van Bruggen + +This software is provided 'as-is', without any express or implied +warranty. In no event will the authors be held liable for any damages +arising from the use of this software. + +Permission is granted to anyone to use this software for any purpose, +including commercial applications, and to alter it and redistribute it +freely, subject to the following restrictions: + +1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. +2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. +3. This notice may not be removed or altered from any source distribution. diff --git a/Makefile b/Makefile @@ -0,0 +1,73 @@ +# tisp - tiny lisp +# See LICENSE file for copyright and license details. + +include config.mk + +EXE = tisp +SRC = $(wildcard *.c */*.c) +OBJ = $(SRC:.c=.o) + +all: options $(EXE) + +options: + @echo $(EXE) build options: + @echo "CFLAGS = $(CFLAGS)" + @echo "LDFLAGS = $(LDFLAGS)" + +.o: + @echo $(LD) $@ + @$(LD) -o $@ $< $(LDFLAGS) + +.c.o: + @echo $(CC) $< + @$(CC) -c -o $@ $< $(CFLAGS) + +$(OBJ): config.h config.mk + +config.h: + @echo creating $@ from config.def.h + @cp config.def.h $@ + +$(EXE): $(OBJ) + @echo $(CC) -o $@ + @$(CC) -o $@ $(OBJ) $(LDFLAGS) + +clean: + @echo -n cleaning ... + @rm -f $(OBJ) $(EXE) + @echo \ done + +install: all + @echo -n installing $(EXE) to $(DESTDIR)$(PREFIX)/bin ... + @mkdir -p $(DESTDIR)$(PREFIX)/bin + @cp -f $(EXE) $(DESTDIR)$(PREFIX)/bin + @chmod 755 $(DESTDIR)$(PREFIX)/bin/$(EXE) + @echo \ done + @echo -n installing manual page to $(DESTDIR)$(MANPREFIX)/man1 ... + @mkdir -p $(DESTDIR)$(MANPREFIX)/man1 + @sed "s/VERSION/$(VERSION)/g" < $(EXE).1 > $(DESTDIR)$(MANPREFIX)/man1/$(EXE).1 + @chmod 644 $(DESTDIR)$(MANPREFIX)/man1/$(EXE).1 + @echo \ done + +uninstall: + @echo -n removing $(EXE) from $(DESTDIR)$(PREFIX)/bin ... + @rm -f $(DESTDIR)$(PREFIX)/bin/$(EXE) + @echo \ done + @echo -n removing manual page from $(DESTDIR)$(MANPREFIX)/man1 ... + @rm -f $(DESTDIR)$(MANPREFIX)/man1/$(EXE).1 + @echo \ done + +man: + @echo -n updating man page $(EXE).1 ... + @(head -1 README.md | sed "s/$(EXE)/$(EXE) 1 \"`date +%B\ %Y`\" \"$(EXE)\ $(VERSION)\"\n\n##NAME\n\n&/"; \ + echo "\n##SYNOPSIS\n"; \ + ./$(EXE) -h 2>&1 | sed -E 's/(\<[_A-Z][_A-Z]+\>)/\*\1\*/g' | \ + sed -E 's/(-[a-Z]+\>)/\*\*\1\*\*/g' | \ + sed -E 's/(\<$(EXE)\>)/\*\*\1\*\*/g' | \ + sed 's/_/\\_/g' | sed 's/:/:\ /g'| cut -d' ' -f2-; \ + echo "\n##DESCRIPTION"; \ + tail +2 README.md;) | \ + md2roff - | sed "9s/]/]\ /g" | sed "9s/|/|\ /g" > $(EXE).1 + @echo \ done + +.PHONY: all options clean install uninstall man diff --git a/README.md b/README.md @@ -0,0 +1,34 @@ +# tisp \- tiny lisp + +Tiny lisp implementation, still in heavy development, barely even "useable." +Designed to be scheme-like, ie very minimalist. + +## OPTIONS + +#### -h + +Print help and exit + +#### -v + +Print version info and exit + +## USAGE + +Run the program from the command line to launch the REPL, type command and +press enter to see result. Alternatively you can pass a single command as the +first argument to the command line program and see a result instantly. + +## AUTHOR + +Ed van Bruggen <ed@edryd.org> + +## SEE ALSO + +See project page at <https://edryd.org/projects/tisp.html> + +View source code at <https://github.com/edvb/tisp> + +## LICENSE + +zlib License diff --git a/config.def.h b/config.def.h @@ -0,0 +1,2 @@ +#define SHOW_HINTS 1 +#define USE_LINENOISE 1 /* TODO implement */ diff --git a/config.mk b/config.mk @@ -0,0 +1,18 @@ +# tisp version number +VERSION = 0.0.0 + +# paths +PREFIX = /usr/local +MANPREFIX = $(PREFIX)/share/man + +# includes and libraries +INCS = -Iinclude +LIBS = -lm + +# flags +CPPFLAGS = -DVERSION=\"$(VERSION)\" -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=600 +CFLAGS = -g -std=c99 -pedantic -Wall $(INCS) $(CPPFLAGS) +LDFLAGS = -g $(LIBS) + +# compiler and linker +CC = cc diff --git a/extern/arg.h b/extern/arg.h @@ -0,0 +1,63 @@ +/* + * Copy me if you can. + * by 20h + */ + +#ifndef ARG_H__ +#define ARG_H__ + +extern char *argv0; + +/* use main(int argc, char *argv[]) */ +#define ARGBEGIN for (argv0 = basename(*argv), argv++, argc--;\ + argv[0] && argv[0][0] == '-'\ + && argv[0][1];\ + argc--, argv++) {\ + char argc_;\ + char **argv_;\ + int brk_;\ + if (argv[0][1] == '-' && argv[0][2] == '\0') {\ + argv++;\ + argc--;\ + break;\ + }\ + for (brk_ = 0, argv[0]++, argv_ = argv;\ + argv[0][0] && !brk_;\ + argv[0]++) {\ + if (argv_ != argv)\ + break;\ + argc_ = argv[0][0];\ + switch (argc_) + +/* Handles -NUM syntax */ +#define ARGNUM case '0':\ + case '1':\ + case '2':\ + case '3':\ + case '4':\ + case '5':\ + case '6':\ + case '7':\ + case '8':\ + case '9' + +#define ARGEND }\ + } + +#define ARGC() argc_ + +#define ARGNUMF() (brk_ = 1, atoi(argv[0])) + +#define EARGF(x) ((argv[0][1] == '\0' && argv[1] == NULL)?\ + ((x), abort(), (char *)0) :\ + (brk_ = 1, (argv[0][1] != '\0')?\ + (&argv[0][1]) :\ + (argc--, argv++, argv[0]))) + +#define ARGF() ((argv[0][1] == '\0' && argv[1] == NULL)?\ + (char *)0 :\ + (brk_ = 1, (argv[0][1] != '\0')?\ + (&argv[0][1]) :\ + (argc--, argv++, argv[0]))) + +#endif diff --git a/extern/linenoise.c b/extern/linenoise.c @@ -0,0 +1,1199 @@ +/* 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) 2010-2016, Salvatore Sanfilippo <antirez at gmail dot com> + * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com> + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * ------------------------------------------------------------------------ + * + * References: + * - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html + * - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html + * + * Todo list: + * - Filter bogus Ctrl+<char> combinations. + * - Win32 support + * + * Bloat: + * - History search like Ctrl+r in readline? + * + * List of escape sequences used by this program, we do everything just + * with three sequences. In order to be so cheap we may have some + * flickering effect with some slow terminal, but the lesser sequences + * the more compatible. + * + * EL (Erase Line) + * Sequence: ESC [ n K + * Effect: if n is 0 or missing, clear from cursor to end of line + * Effect: if n is 1, clear from beginning of line to cursor + * Effect: if n is 2, clear entire line + * + * CUF (CUrsor Forward) + * Sequence: ESC [ n C + * Effect: moves cursor forward n chars + * + * CUB (CUrsor Backward) + * Sequence: ESC [ n D + * Effect: moves cursor backward n chars + * + * The following is used to get the terminal width if getting + * the width with the TIOCGWINSZ ioctl fails + * + * DSR (Device Status Report) + * Sequence: ESC [ 6 n + * Effect: reports the current cusor position as ESC [ n ; m R + * where n is the row and m is the column + * + * When multi line mode is enabled, we also use an additional escape + * sequence. However multi line editing is disabled by default. + * + * CUU (Cursor Up) + * Sequence: ESC [ n A + * Effect: moves cursor up of n chars. + * + * CUD (Cursor Down) + * Sequence: ESC [ n B + * Effect: moves cursor down of n chars. + * + * When linenoiseClearScreen() is called, two additional escape sequences + * are used in order to clear the screen and position the cursor at home + * position. + * + * CUP (Cursor position) + * Sequence: ESC [ H + * Effect: moves the cursor to upper left corner + * + * ED (Erase display) + * Sequence: ESC [ 2 J + * Effect: clear the whole screen + * + */ + +#include <termios.h> +#include <unistd.h> +#include <stdlib.h> +#include <stdio.h> +#include <errno.h> +#include <string.h> +#include <stdlib.h> +#include <ctype.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/ioctl.h> +#include <unistd.h> +#include "linenoise.h" + +#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100 +#define LINENOISE_MAX_LINE 4096 +static char *unsupported_term[] = {"dumb","cons25","emacs",NULL}; +static linenoiseCompletionCallback *completionCallback = NULL; +static linenoiseHintsCallback *hintsCallback = NULL; +static linenoiseFreeHintsCallback *freeHintsCallback = NULL; + +static 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 mlmode = 0; /* Multi line mode. Default is single line. */ +static int atexit_registered = 0; /* Register atexit just 1 time. */ +static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN; +static int history_len = 0; +static char **history = NULL; + +/* The linenoiseState structure represents the state during line editing. + * We pass this state to functions implementing specific editing + * functionalities. */ +struct linenoiseState { + int ifd; /* Terminal stdin file descriptor. */ + int ofd; /* Terminal stdout file descriptor. */ + char *buf; /* Edited line buffer. */ + size_t buflen; /* Edited line buffer size. */ + const char *prompt; /* Prompt to display. */ + size_t plen; /* Prompt length. */ + size_t pos; /* Current cursor position. */ + size_t oldpos; /* Previous refresh cursor position. */ + size_t len; /* Current edited line length. */ + size_t cols; /* Number of columns in terminal. */ + size_t maxrows; /* Maximum num of rows used so far (multiline mode) */ + int history_index; /* The history index we are currently editing. */ +}; + +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); +static void refreshLine(struct linenoiseState *l); + +/* Debugging macro. */ +#if 0 +FILE *lndebug_fp = NULL; +#define lndebug(...) \ + do { \ + if (lndebug_fp == NULL) { \ + lndebug_fp = fopen("/tmp/lndebug.txt","a"); \ + fprintf(lndebug_fp, \ + "[%d %d %d] p: %d, rows: %d, rpos: %d, max: %d, oldmax: %d\n", \ + (int)l->len,(int)l->pos,(int)l->oldpos,plen,rows,rpos, \ + (int)l->maxrows,old_rows); \ + } \ + fprintf(lndebug_fp, ", " __VA_ARGS__); \ + fflush(lndebug_fp); \ + } while (0) +#else +#define lndebug(fmt, ...) +#endif + +/* ======================= Low level terminal handling ====================== */ + +/* Set if to use or not the multi line mode. */ +void linenoiseSetMultiLine(int ml) { + mlmode = ml; +} + +/* Return true if the terminal name is in the list of terminals we know are + * not able to understand basic escape sequences. */ +static int isUnsupportedTerm(void) { + char *term = getenv("TERM"); + int j; + + if (term == NULL) return 0; + for (j = 0; unsupported_term[j]; j++) + if (!strcasecmp(term,unsupported_term[j])) return 1; + return 0; +} + +/* Raw mode: 1960 magic shit. */ +static int enableRawMode(int fd) { + struct termios raw; + + if (!isatty(STDIN_FILENO)) goto fatal; + if (!atexit_registered) { + atexit(linenoiseAtExit); + atexit_registered = 1; + } + if (tcgetattr(fd,&orig_termios) == -1) goto fatal; + + raw = orig_termios; /* modify the original mode */ + /* input modes: no break, no CR to NL, no parity check, no strip char, + * no start/stop output control. */ + raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON); + /* output modes - disable post processing */ + raw.c_oflag &= ~(OPOST); + /* control modes - set 8 bit chars */ + raw.c_cflag |= (CS8); + /* local modes - choing off, canonical off, no extended functions, + * no signal chars (^Z,^C) */ + raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG); + /* control chars - set return condition: min number of bytes and timer. + * We want read to return every single byte, without timeout. */ + raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */ + + /* put terminal in raw mode after flushing */ + if (tcsetattr(fd,TCSAFLUSH,&raw) < 0) goto fatal; + rawmode = 1; + return 0; + +fatal: + errno = ENOTTY; + return -1; +} + +static void disableRawMode(int fd) { + /* Don't even check the return value as it's too late. */ + if (rawmode && tcsetattr(fd,TCSAFLUSH,&orig_termios) != -1) + rawmode = 0; +} + +/* Use the ESC [6n escape sequence to query the horizontal cursor position + * and return it. On error -1 is returned, on success the position of the + * cursor. */ +static int getCursorPosition(int ifd, int ofd) { + char buf[32]; + int cols, rows; + unsigned int i = 0; + + /* Report cursor location */ + if (write(ofd, "\x1b[6n", 4) != 4) return -1; + + /* Read the response: ESC [ rows ; cols R */ + while (i < sizeof(buf)-1) { + if (read(ifd,buf+i,1) != 1) break; + if (buf[i] == 'R') break; + i++; + } + buf[i] = '\0'; + + /* Parse it. */ + if (buf[0] != ESC || buf[1] != '[') return -1; + if (sscanf(buf+2,"%d;%d",&rows,&cols) != 2) return -1; + return cols; +} + +/* Try to get the number of columns in the current terminal, or assume 80 + * if it fails. */ +static int getColumns(int ifd, int ofd) { + struct winsize ws; + + if (ioctl(1, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) { + /* ioctl() failed. Try to query the terminal itself. */ + int start, cols; + + /* Get the initial position so we can restore it later. */ + start = getCursorPosition(ifd,ofd); + if (start == -1) goto failed; + + /* Go to right margin and get position. */ + if (write(ofd,"\x1b[999C",6) != 6) goto failed; + cols = getCursorPosition(ifd,ofd); + if (cols == -1) goto failed; + + /* Restore position. */ + if (cols > start) { + char seq[32]; + snprintf(seq,32,"\x1b[%dD",cols-start); + if (write(ofd,seq,strlen(seq)) == -1) { + /* Can't recover... */ + } + } + return cols; + } else { + return ws.ws_col; + } + +failed: + return 80; +} + +/* Clear the screen. Used to handle ctrl+l */ +void linenoiseClearScreen(void) { + if (write(STDOUT_FILENO,"\x1b[H\x1b[2J",7) <= 0) { + /* nothing to do, just to avoid warning. */ + } +} + +/* Beep, used for completion when there is nothing to complete or when all + * the choices were already shown. */ +static void linenoiseBeep(void) { + fprintf(stderr, "\x7"); + fflush(stderr); +} + +/* ============================== Completion ================================ */ + +/* Free a list of completion option populated by linenoiseAddCompletion(). */ +static void freeCompletions(linenoiseCompletions *lc) { + size_t i; + for (i = 0; i < lc->len; i++) + free(lc->cvec[i]); + if (lc->cvec != NULL) + free(lc->cvec); +} + +/* This is an helper function for linenoiseEdit() and is called when the + * user types the <tab> key in order to complete the string currently in the + * input. + * + * The state of the editing is encapsulated into the pointed linenoiseState + * structure as described in the structure definition. */ +static int completeLine(struct linenoiseState *ls) { + linenoiseCompletions lc = { 0, NULL }; + int nread, nwritten; + char c = 0; + + completionCallback(ls->buf,&lc); + if (lc.len == 0) { + linenoiseBeep(); + } else { + size_t stop = 0, i = 0; + + while(!stop) { + /* Show completion or original buffer */ + if (i < lc.len) { + struct linenoiseState saved = *ls; + + ls->len = ls->pos = strlen(lc.cvec[i]); + ls->buf = lc.cvec[i]; + refreshLine(ls); + ls->len = saved.len; + ls->pos = saved.pos; + ls->buf = saved.buf; + } else { + refreshLine(ls); + } + + nread = read(ls->ifd,&c,1); + if (nread <= 0) { + freeCompletions(&lc); + return -1; + } + + switch(c) { + case 9: /* tab */ + i = (i+1) % (lc.len+1); + if (i == lc.len) linenoiseBeep(); + break; + case 27: /* escape */ + /* Re-show original buffer */ + if (i < lc.len) refreshLine(ls); + stop = 1; + break; + default: + /* Update buffer and return */ + if (i < lc.len) { + nwritten = snprintf(ls->buf,ls->buflen,"%s",lc.cvec[i]); + ls->len = ls->pos = nwritten; + } + stop = 1; + break; + } + } + } + + freeCompletions(&lc); + return c; /* Return last read character */ +} + +/* Register a callback function to be called for tab-completion. */ +void linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn) { + completionCallback = fn; +} + +/* Register a hits function to be called to show hits to the user at the + * right of the prompt. */ +void linenoiseSetHintsCallback(linenoiseHintsCallback *fn) { + hintsCallback = fn; +} + +/* Register a function to free the hints returned by the hints callback + * registered with linenoiseSetHintsCallback(). */ +void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *fn) { + freeHintsCallback = fn; +} + +/* This function is used by the callback function registered by the user + * in order to add completion options given the input string when the + * user typed <tab>. See the example.c source code for a very easy to + * understand example. */ +void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) { + size_t len = strlen(str); + char *copy, **cvec; + + copy = malloc(len+1); + if (copy == NULL) return; + memcpy(copy,str,len+1); + cvec = realloc(lc->cvec,sizeof(char*)*(lc->len+1)); + if (cvec == NULL) { + free(copy); + return; + } + lc->cvec = cvec; + lc->cvec[lc->len++] = copy; +} + +/* =========================== Line editing ================================= */ + +/* We define a very simple "append buffer" structure, that is an heap + * allocated string where we can append to. This is useful in order to + * write all the escape sequences in a buffer and flush them to the standard + * output in a single call, to avoid flickering effects. */ +struct abuf { + char *b; + int len; +}; + +static void abInit(struct abuf *ab) { + ab->b = NULL; + ab->len = 0; +} + +static void abAppend(struct abuf *ab, const char *s, int len) { + char *new = realloc(ab->b,ab->len+len); + + if (new == NULL) return; + memcpy(new+ab->len,s,len); + ab->b = new; + ab->len += len; +} + +static void abFree(struct abuf *ab) { + free(ab->b); +} + +/* Helper of refreshSingleLine() and refreshMultiLine() to show hints + * to the right of the prompt. */ +void refreshShowHints(struct abuf *ab, struct linenoiseState *l, int plen) { + char seq[64]; + if (hintsCallback && plen+l->len < l->cols) { + int color = -1, bold = 0; + char *hint = hintsCallback(l->buf,&color,&bold); + if (hint) { + int hintlen = strlen(hint); + int hintmaxlen = l->cols-(plen+l->len); + if (hintlen > hintmaxlen) hintlen = hintmaxlen; + if (bold == 1 && color == -1) color = 37; + if (color != -1 || bold != 0) + snprintf(seq,64,"\033[%d;%d;49m",bold,color); + 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. */ +static void refreshSingleLine(struct linenoiseState *l) { + char seq[64]; + size_t plen = strlen(l->prompt); + int fd = l->ofd; + char *buf = l->buf; + size_t len = l->len; + size_t pos = l->pos; + struct abuf ab; + + while((plen+pos) >= l->cols) { + buf++; + len--; + pos--; + } + while (plen+len > l->cols) { + len--; + } + + abInit(&ab); + /* Cursor to left edge */ + snprintf(seq,64,"\r"); + abAppend(&ab,seq,strlen(seq)); + /* Write the prompt and the current buffer content */ + abAppend(&ab,l->prompt,strlen(l->prompt)); + abAppend(&ab,buf,len); + /* Show hits if any. */ + refreshShowHints(&ab,l,plen); + /* Erase to right */ + snprintf(seq,64,"\x1b[0K"); + abAppend(&ab,seq,strlen(seq)); + /* Move cursor to original position. */ + snprintf(seq,64,"\r\x1b[%dC", (int)(pos+plen)); + abAppend(&ab,seq,strlen(seq)); + if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */ + abFree(&ab); +} + +/* Multi line low level line refresh. + * + * Rewrite the currently edited line accordingly to the buffer content, + * cursor position, and number of columns of the terminal. */ +static void refreshMultiLine(struct linenoiseState *l) { + char seq[64]; + int plen = strlen(l->prompt); + int rows = (plen+l->len+l->cols-1)/l->cols; /* rows used by current buf. */ + int rpos = (plen+l->oldpos+l->cols)/l->cols; /* cursor relative row. */ + int rpos2; /* rpos after refresh. */ + int col; /* colum position, zero-based. */ + int old_rows = l->maxrows; + int fd = l->ofd, j; + struct abuf ab; + + /* Update maxrows if needed. */ + if (rows > (int)l->maxrows) l->maxrows = rows; + + /* First step: clear all the lines used before. To do so start by + * going to the last row. */ + abInit(&ab); + if (old_rows-rpos > 0) { + lndebug("go down %d", old_rows-rpos); + snprintf(seq,64,"\x1b[%dB", old_rows-rpos); + abAppend(&ab,seq,strlen(seq)); + } + + /* Now for every row clear it, go up. */ + for (j = 0; j < old_rows-1; j++) { + lndebug("clear+up"); + snprintf(seq,64,"\r\x1b[0K\x1b[1A"); + abAppend(&ab,seq,strlen(seq)); + } + + /* Clean the top line. */ + lndebug("clear"); + snprintf(seq,64,"\r\x1b[0K"); + abAppend(&ab,seq,strlen(seq)); + + /* Write the prompt and the current buffer content */ + abAppend(&ab,l->prompt,strlen(l->prompt)); + abAppend(&ab,l->buf,l->len); + + /* Show hits if any. */ + refreshShowHints(&ab,l,plen); + + /* If we are at the very end of the screen with our prompt, we need to + * emit a newline and move the prompt to the first column. */ + if (l->pos && + l->pos == l->len && + (l->pos+plen) % l->cols == 0) + { + lndebug("<newline>"); + abAppend(&ab,"\n",1); + snprintf(seq,64,"\r"); + abAppend(&ab,seq,strlen(seq)); + rows++; + if (rows > (int)l->maxrows) l->maxrows = rows; + } + + /* Move cursor to right position. */ + rpos2 = (plen+l->pos+l->cols)/l->cols; /* current cursor relative row. */ + lndebug("rpos2 %d", rpos2); + + /* Go up till we reach the expected positon. */ + if (rows-rpos2 > 0) { + lndebug("go-up %d", rows-rpos2); + snprintf(seq,64,"\x1b[%dA", rows-rpos2); + abAppend(&ab,seq,strlen(seq)); + } + + /* Set column. */ + col = (plen+(int)l->pos) % (int)l->cols; + lndebug("set col %d", 1+col); + if (col) + snprintf(seq,64,"\r\x1b[%dC", col); + else + snprintf(seq,64,"\r"); + abAppend(&ab,seq,strlen(seq)); + + lndebug("\n"); + l->oldpos = l->pos; + + if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */ + abFree(&ab); +} + +/* Calls the two low level functions refreshSingleLine() or + * refreshMultiLine() according to the selected mode. */ +static void refreshLine(struct linenoiseState *l) { + if (mlmode) + refreshMultiLine(l); + else + refreshSingleLine(l); +} + +/* Insert the character 'c' at cursor current position. + * + * On error writing to the terminal -1 is returned, otherwise 0. */ +int linenoiseEditInsert(struct linenoiseState *l, char c) { + if (l->len < l->buflen) { + if (l->len == l->pos) { + l->buf[l->pos] = c; + l->pos++; + l->len++; + l->buf[l->len] = '\0'; + if ((!mlmode && l->plen+l->len < l->cols && !hintsCallback)) { + /* Avoid a full update of the line in the + * trivial case. */ + if (write(l->ofd,&c,1) == -1) return -1; + } else { + refreshLine(l); + } + } else { + memmove(l->buf+l->pos+1,l->buf+l->pos,l->len-l->pos); + l->buf[l->pos] = c; + l->len++; + l->pos++; + l->buf[l->len] = '\0'; + refreshLine(l); + } + } + return 0; +} + +/* Move cursor on the left. */ +void linenoiseEditMoveLeft(struct linenoiseState *l) { + if (l->pos > 0) { + l->pos--; + refreshLine(l); + } +} + +/* Move cursor on the right. */ +void linenoiseEditMoveRight(struct linenoiseState *l) { + if (l->pos != l->len) { + l->pos++; + refreshLine(l); + } +} + +/* Move cursor to the start of the line. */ +void linenoiseEditMoveHome(struct linenoiseState *l) { + if (l->pos != 0) { + l->pos = 0; + refreshLine(l); + } +} + +/* Move cursor to the end of the line. */ +void linenoiseEditMoveEnd(struct linenoiseState *l) { + if (l->pos != l->len) { + l->pos = l->len; + refreshLine(l); + } +} + +/* Substitute the currently edited line with the next or previous history + * entry as specified by 'dir'. */ +#define LINENOISE_HISTORY_NEXT 0 +#define LINENOISE_HISTORY_PREV 1 +void linenoiseEditHistoryNext(struct linenoiseState *l, int dir) { + if (history_len > 1) { + /* Update the current history entry before to + * overwrite it with the next one. */ + free(history[history_len - 1 - l->history_index]); + history[history_len - 1 - l->history_index] = strdup(l->buf); + /* Show the new entry */ + l->history_index += (dir == LINENOISE_HISTORY_PREV) ? 1 : -1; + if (l->history_index < 0) { + l->history_index = 0; + return; + } else if (l->history_index >= history_len) { + l->history_index = history_len-1; + return; + } + strncpy(l->buf,history[history_len - 1 - l->history_index],l->buflen); + l->buf[l->buflen-1] = '\0'; + l->len = l->pos = strlen(l->buf); + refreshLine(l); + } +} + +/* Delete the character at the right of the cursor without altering the cursor + * position. Basically this is what happens with the "Delete" keyboard key. */ +void linenoiseEditDelete(struct linenoiseState *l) { + if (l->len > 0 && l->pos < l->len) { + memmove(l->buf+l->pos,l->buf+l->pos+1,l->len-l->pos-1); + l->len--; + l->buf[l->len] = '\0'; + refreshLine(l); + } +} + +/* Backspace implementation. */ +void linenoiseEditBackspace(struct linenoiseState *l) { + if (l->pos > 0 && l->len > 0) { + memmove(l->buf+l->pos-1,l->buf+l->pos,l->len-l->pos); + l->pos--; + l->len--; + l->buf[l->len] = '\0'; + refreshLine(l); + } +} + +/* Delete the previosu word, maintaining the cursor at the start of the + * current word. */ +void linenoiseEditDeletePrevWord(struct linenoiseState *l) { + size_t old_pos = l->pos; + size_t diff; + + while (l->pos > 0 && l->buf[l->pos-1] == ' ') + l->pos--; + while (l->pos > 0 && l->buf[l->pos-1] != ' ') + l->pos--; + diff = old_pos - l->pos; + memmove(l->buf+l->pos,l->buf+old_pos,l->len-old_pos+1); + l->len -= diff; + refreshLine(l); +} + +/* This function is the core of the line editing capability of linenoise. + * It expects 'fd' to be already in "raw mode" so that every key pressed + * will be returned ASAP to read(). + * + * The resulting string is put into 'buf' when the user type enter, or + * when ctrl+d is typed. + * + * The function returns the length of the current buffer. */ +static int linenoiseEdit(int stdin_fd, int stdout_fd, char *buf, size_t buflen, const char *prompt) +{ + struct linenoiseState l; + + /* Populate the linenoise state that we pass to functions implementing + * specific editing functionalities. */ + l.ifd = stdin_fd; + l.ofd = stdout_fd; + l.buf = buf; + l.buflen = buflen; + l.prompt = prompt; + l.plen = strlen(prompt); + l.oldpos = l.pos = 0; + l.len = 0; + l.cols = getColumns(stdin_fd, stdout_fd); + l.maxrows = 0; + l.history_index = 0; + + /* Buffer starts empty. */ + l.buf[0] = '\0'; + l.buflen--; /* Make sure there is always space for the nulterm */ + + /* 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; + while(1) { + char c; + int nread; + char seq[3]; + + nread = read(l.ifd,&c,1); + if (nread <= 0) return l.len; + + /* Only autocomplete when the callback is set. It returns < 0 when + * there was an error reading from fd. Otherwise it will return the + * character that should be handled next. */ + if (c == 9 && completionCallback != NULL) { + c = completeLine(&l); + /* Return on errors */ + if (c < 0) return l.len; + /* Read next character when 0 */ + if (c == 0) continue; + } + + 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 (int)l.len; + case CTRL_C: /* ctrl-c */ + errno = EAGAIN; + return -1; + 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]); + return -1; + } + break; + case CTRL_T: /* ctrl-t, swaps current character with previous. */ + if (l.pos > 0 && l.pos < l.len) { + int aux = buf[l.pos-1]; + buf[l.pos-1] = buf[l.pos]; + buf[l.pos] = aux; + if (l.pos != l.len-1) l.pos++; + refreshLine(&l); + } + break; + case CTRL_B: /* ctrl-b */ + linenoiseEditMoveLeft(&l); + break; + case CTRL_F: /* ctrl-f */ + linenoiseEditMoveRight(&l); + break; + case CTRL_P: /* ctrl-p */ + linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV); + break; + case CTRL_N: /* ctrl-n */ + linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT); + break; + case ESC: /* escape sequence */ + /* Read the next two bytes representing the escape sequence. + * Use two calls to handle slow terminals returning the two + * chars at different times. */ + if (read(l.ifd,seq,1) == -1) break; + if (read(l.ifd,seq+1,1) == -1) break; + + /* ESC [ sequences. */ + if (seq[0] == '[') { + if (seq[1] >= '0' && seq[1] <= '9') { + /* Extended escape, read additional byte. */ + if (read(l.ifd,seq+2,1) == -1) break; + if (seq[2] == '~') { + switch(seq[1]) { + case '3': /* Delete key. */ + linenoiseEditDelete(&l); + break; + } + } + } else { + switch(seq[1]) { + case 'A': /* Up */ + linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV); + break; + case 'B': /* Down */ + linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT); + break; + case 'C': /* Right */ + linenoiseEditMoveRight(&l); + break; + case 'D': /* Left */ + linenoiseEditMoveLeft(&l); + break; + case 'H': /* Home */ + linenoiseEditMoveHome(&l); + break; + case 'F': /* End*/ + linenoiseEditMoveEnd(&l); + break; + } + } + } + + /* ESC O sequences. */ + else if (seq[0] == 'O') { + switch(seq[1]) { + case 'H': /* Home */ + linenoiseEditMoveHome(&l); + break; + case 'F': /* End*/ + linenoiseEditMoveEnd(&l); + break; + } + } + break; + default: + if (linenoiseEditInsert(&l,c)) return -1; + break; + case CTRL_U: /* Ctrl+u, delete the whole line. */ + buf[0] = '\0'; + l.pos = l.len = 0; + refreshLine(&l); + break; + case CTRL_K: /* Ctrl+k, delete from current to end of line. */ + 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 l.len; +} + +/* This special mode is used by linenoise in order to print scan codes + * on screen for debugging / development purposes. It is implemented + * by the linenoise_example program using the --keycodes option. */ +void linenoisePrintKeyCodes(void) { + char quit[4]; + + printf("Linenoise key codes debugging mode.\n" + "Press keys to see scan codes. Type 'quit' at any time to exit.\n"); + if (enableRawMode(STDIN_FILENO) == -1) return; + memset(quit,' ',4); + while(1) { + char c; + int nread; + + nread = read(STDIN_FILENO,&c,1); + if (nread <= 0) continue; + memmove(quit,quit+1,sizeof(quit)-1); /* shift string to left. */ + quit[sizeof(quit)-1] = c; /* Insert current char on the right. */ + if (memcmp(quit,"quit",sizeof(quit)) == 0) break; + + printf("'%c' %02x (%d) (type quit to exit)\n", + isprint(c) ? c : '?', (int)c, (int)c); + printf("\r"); /* Go left edge manually, we are in raw mode. */ + fflush(stdout); + } + disableRawMode(STDIN_FILENO); +} + +/* This function calls the line editing function linenoiseEdit() using + * the STDIN file descriptor set in raw mode. */ +static int linenoiseRaw(char *buf, size_t buflen, const char *prompt) { + int count; + + if (buflen == 0) { + errno = EINVAL; + return -1; + } + + if (enableRawMode(STDIN_FILENO) == -1) return -1; + count = linenoiseEdit(STDIN_FILENO, STDOUT_FILENO, buf, buflen, prompt); + disableRawMode(STDIN_FILENO); + printf("\n"); + return count; +} + +/* This function is called when linenoise() is called with the standard + * input file descriptor not attached to a TTY. So for example when the + * program using linenoise is called in pipe or with a file redirected + * to its standard input. In this case, we want to be able to return the + * line regardless of its length (by default we are limited to 4k). */ +static char *linenoiseNoTTY(void) { + char *line = NULL; + size_t len = 0, maxlen = 0; + + while(1) { + if (len == maxlen) { + if (maxlen == 0) maxlen = 16; + maxlen *= 2; + char *oldval = line; + line = realloc(line,maxlen); + if (line == NULL) { + if (oldval) free(oldval); + return NULL; + } + } + int c = fgetc(stdin); + if (c == EOF || c == '\n') { + if (c == EOF && len == 0) { + free(line); + return NULL; + } else { + line[len] = '\0'; + return line; + } + } else { + line[len] = c; + len++; + } + } +} + +/* The high level function that is the main API of the linenoise library. + * This function checks if the terminal has basic capabilities, just checking + * for a blacklist of stupid terminals, and later either calls the line + * editing function or uses dummy fgets() so that you will be able to type + * something even in the most desperate of the conditions. */ +char *linenoise(const char *prompt) { + char buf[LINENOISE_MAX_LINE]; + int count; + + if (!isatty(STDIN_FILENO)) { + /* Not a tty: read from file / pipe. In this mode we don't want any + * limit to the line size, so we call a function to handle that. */ + return linenoiseNoTTY(); + } else if (isUnsupportedTerm()) { + size_t len; + + printf("%s",prompt); + fflush(stdout); + if (fgets(buf,LINENOISE_MAX_LINE,stdin) == NULL) return NULL; + len = strlen(buf); + while(len && (buf[len-1] == '\n' || buf[len-1] == '\r')) { + len--; + buf[len] = '\0'; + } + return strdup(buf); + } else { + count = linenoiseRaw(buf,LINENOISE_MAX_LINE,prompt); + if (count == -1) return NULL; + return strdup(buf); + } +} + +/* 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) { + free(ptr); +} + +/* ================================ History ================================= */ + +/* Free the history, but does not reset it. Only used when we have to + * exit() to avoid memory leaks are reported by valgrind & co. */ +static void freeHistory(void) { + if (history) { + int j; + + for (j = 0; j < history_len; j++) + free(history[j]); + free(history); + } +} + +/* At exit we'll try to fix the terminal to the initial conditions. */ +static void linenoiseAtExit(void) { + disableRawMode(STDIN_FILENO); + freeHistory(); +} + +/* This is the API call to add a new entry in the linenoise history. + * It uses a fixed array of char pointers that are shifted (memmoved) + * when the history max length is reached in order to remove the older + * entry and make room for the new one, so it is not exactly suitable for huge + * histories, but will work well for a few hundred of entries. + * + * Using a circular buffer is smarter, but a bit more complex to handle. */ +int linenoiseHistoryAdd(const char *line) { + char *linecopy; + + if (history_max_len == 0) return 0; + + /* Initialization on first call. */ + if (history == NULL) { + history = malloc(sizeof(char*)*history_max_len); + if (history == NULL) return 0; + memset(history,0,(sizeof(char*)*history_max_len)); + } + + /* Don't add duplicated lines. */ + if (history_len && !strcmp(history[history_len-1], line)) return 0; + + /* Add an heap allocated copy of the line in the history. + * If we reached the max length, remove the older line. */ + linecopy = strdup(line); + if (!linecopy) return 0; + if (history_len == history_max_len) { + free(history[0]); + memmove(history,history+1,sizeof(char*)*(history_max_len-1)); + history_len--; + } + history[history_len] = linecopy; + history_len++; + return 1; +} + +/* Set the maximum length for the history. This function can be called even + * if there is already some history, the function will make sure to retain + * just the latest 'len' elements if the new history length value is smaller + * than the amount of items already inside the history. */ +int linenoiseHistorySetMaxLen(int len) { + char **new; + + if (len < 1) return 0; + if (history) { + int tocopy = history_len; + + new = malloc(sizeof(char*)*len); + if (new == NULL) return 0; + + /* If we can't copy everything, free the elements we'll not use. */ + if (len < tocopy) { + int j; + + for (j = 0; j < tocopy-len; j++) free(history[j]); + tocopy = len; + } + memset(new,0,sizeof(char*)*len); + memcpy(new,history+(history_len-tocopy), sizeof(char*)*tocopy); + free(history); + history = new; + } + history_max_len = len; + if (history_len > history_max_len) + history_len = history_max_len; + return 1; +} + +/* Save the history in the specified file. On success 0 is returned + * otherwise -1 is returned. */ +int linenoiseHistorySave(const char *filename) { + mode_t old_umask = umask(S_IXUSR|S_IRWXG|S_IRWXO); + FILE *fp; + int j; + + fp = fopen(filename,"w"); + umask(old_umask); + if (fp == NULL) return -1; + chmod(filename,S_IRUSR|S_IWUSR); + for (j = 0; j < history_len; j++) + fprintf(fp,"%s\n",history[j]); + fclose(fp); + return 0; +} + +/* Load the history from the specified file. If the file does not exist + * zero is returned and no operation is performed. + * + * If the file exists and the operation succeeded 0 is returned, otherwise + * on error -1 is returned. */ +int linenoiseHistoryLoad(const char *filename) { + FILE *fp = fopen(filename,"r"); + char buf[LINENOISE_MAX_LINE]; + + if (fp == NULL) return -1; + + while (fgets(buf,LINENOISE_MAX_LINE,fp) != NULL) { + char *p; + + p = strchr(buf,'\r'); + if (!p) p = strchr(buf,'\n'); + if (p) *p = '\0'; + linenoiseHistoryAdd(buf); + } + fclose(fp); + return 0; +} diff --git a/extern/linenoise.h b/extern/linenoise.h @@ -0,0 +1,73 @@ +/* linenoise.h -- VERSION 1.0 + * + * Guerrilla line editing library against the idea that a line editing lib + * needs to be 20,000 lines of C code. + * + * See linenoise.c for more information. + * + * ------------------------------------------------------------------------ + * + * Copyright (c) 2010-2014, Salvatore Sanfilippo <antirez at gmail dot com> + * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com> + * + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef __LINENOISE_H +#define __LINENOISE_H + +#ifdef __cplusplus +extern "C" { +#endif + +typedef struct linenoiseCompletions { + size_t len; + char **cvec; +} linenoiseCompletions; + +typedef void(linenoiseCompletionCallback)(const char *, linenoiseCompletions *); +typedef char*(linenoiseHintsCallback)(const char *, int *color, int *bold); +typedef void(linenoiseFreeHintsCallback)(void *); +void linenoiseSetCompletionCallback(linenoiseCompletionCallback *); +void linenoiseSetHintsCallback(linenoiseHintsCallback *); +void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *); +void linenoiseAddCompletion(linenoiseCompletions *, const char *); + +char *linenoise(const char *prompt); +void linenoiseFree(void *ptr); +int linenoiseHistoryAdd(const char *line); +int linenoiseHistorySetMaxLen(int len); +int linenoiseHistorySave(const char *filename); +int linenoiseHistoryLoad(const char *filename); +void linenoiseClearScreen(void); +void linenoiseSetMultiLine(int ml); +void linenoisePrintKeyCodes(void); + +#ifdef __cplusplus +} +#endif + +#endif /* __LINENOISE_H */ diff --git a/tisp.1 b/tisp.1 @@ -0,0 +1,35 @@ +.\" x-roff document +.do mso man.tmac +.TH tisp 1 "February 2018" "tisp 0.0.0" +.PP +.SH NAME +tisp - tiny lisp +.PP +.SH SYNOPSIS +\fBtisp\fP [\fB-hv\fP] [\fICODE\fP] +.PP +.SH DESCRIPTION +Tiny lisp implementation, still in heavy development, barely even "useable." Designed to be scheme-like, ie very minimalist. +.PP +.SH OPTIONS +.TP +\fB-h +\fRPrint help and exit +.PP +.TP +\fB-v +\fRPrint version info and exit +.PP +.SH USAGE +Run the program from the command line to launch the REPL, type command and press enter to see result. Alternatively you can pass a single command as the first argument to the command line program and see a result instantly. +.PP +.SH AUTHOR +Ed van Bruggen <ed@edryd.org> +.PP +.SH SEE ALSO +See project page at <https://edryd.org/projects/tisp.html> +.PP +View source code at <https://github.com/edvb/tisp> +.PP +.SH LICENSE +zlib License diff --git a/tisp.c b/tisp.c @@ -0,0 +1,546 @@ +/* See LICENSE file for copyright and license details. */ +#include <ctype.h> +#include <libgen.h> +#include <limits.h> +#include <regex.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "extern/arg.h" +#include "extern/linenoise.h" +#include "util.h" + +/* defines */ +#define car(P) ((P)->v.p.car) +#define cdr(P) ((P)->v.p.cdr) +#define nilp(P) ((P)->t == NIL) + +/* typedefs */ +struct Val; +typedef struct Val *Val; + +/* improved interface for a pointer to a string */ +typedef struct Str { + char *d; +} *Str; + +typedef enum { false, true } bool; + +typedef enum { + ERROR_OK, + ERROR_SYNTAX +} Error; + +/* fraction */ +typedef struct { + int num, den; +} Ratio; + +typedef struct Entry *Entry; + +typedef struct Hash { + int size, cap; + struct Entry { + char *key; + Val val; + } *items; + struct Hash *next; +} *Hash; + +/* basic function written in C, not lisp */ +typedef Val (*Prim)(Hash, Val); + +/* function written directly in lisp instead of C */ +typedef struct { + Val args; + Val body; + Hash env; +} Func; + +typedef struct { + Val car, cdr; +} Pair; + +typedef enum { + NIL, + BOOLEAN, + INTEGER, + RATIONAL, + STRING, + SYMBOL, + PRIMITIVE, + FUNCTION, + PAIR, +} Type; + +struct Val { + Type t; + union { + int i; + Ratio r; + char *s; + Prim pr; + Func f; + Pair p; + } v; +}; + +/* functions */ +static void hash_add(Hash ht, char *key, Val val); + +Val read_val(Str str); +Val read_list(Str str); + +static void tisp_print(Val v); +static Val tisp_eval(Hash env, Val v); + +/* variables */ +char *argv0; + +struct Val nil; + +#include "config.h" + +static int +issymbol(char c) +{ + return BETWEEN(c, 'a', 'z') || strchr("+-*/", c); +} + +/* TODO skip comments */ +static void +skip_spaces(Str str) { + for (; *str->d && isspace(*str->d); str->d++); +} + +/* return hashed number based on key */ +static uint32_t +hash(char *key) +{ + uint32_t h = 0; + char c; + while (h < ULONG_MAX && (c = *key++)) + h = h * 33 + c; + return h; +} + +/* create new empty hash table with given capacity */ +static Hash +hash_new(size_t cap) +{ + int i; + if (cap < 1) return NULL; + Hash ht = emalloc(sizeof(struct Hash)); + ht->size = 0; + ht->cap = cap; + ht->items = ecalloc(cap, sizeof(struct Entry)); + for (i = 0; i < cap; i++) + ht->items[i].key = NULL; + ht->next = NULL; + return ht; +} + +static Entry +entry_get(Hash ht, char *key) +{ + int i = hash(key) % ht->cap; + char *s; + while ((s = ht->items[i].key)) { + if (!strcmp(s, key)) + break; + if (++i == ht->cap) + i = 0; + } + return &ht->items[i]; +} + +/* get vale of given key in hash table */ +static Val +hash_get(Hash ht, char *key) +{ + Entry e; + for (; ht; ht = ht->next) { + e = entry_get(ht, key); + if (e->key) + return e->val; + } + return &nil; +} + +/* enlarge the hash table to ensure algorithm's efficiency */ +static void +hash_grow(Hash ht) +{ + if (ht->size < ht->cap / 2) + return; /* only need to grow table if it is more than half full */ + int i; + int ocap = ht->cap; + Entry oitems = ht->items; + ht->cap *= 2; + ht->items = ecalloc(ht->cap, sizeof(struct Entry)); + for (i = 0; i < ht->cap; i++) /* empty the new larger hash table */ + ht->items[i].key = NULL; + for (i = 0; i < ocap; i++) /* repopulate new hash table with old values */ + if (oitems[i].key) + hash_add(ht, oitems[i].key, oitems[i].val); + free(oitems); +} + +/* create new key and value pair to the hash table */ +static void +hash_add(Hash ht, char *key, Val val) +{ + Entry e = entry_get(ht, key); + e->val = val; + if (!e->key) { + e->key = key; + ht->size++; + hash_grow(ht); + } +} + +Val +mk_val(Type t) +{ + Val v = emalloc(sizeof(struct Val)); + v->t = t; + return v; +} + +Val +mk_bool(bool b) +{ + Val v = mk_val(BOOLEAN); + v->v.i = b; + return v; +} + +Val +mk_int(int i) +{ + Val v = mk_val(INTEGER); + v->v.i = i; + return v; +} + +Val +mk_string(char *s) +{ + Val v = mk_val(STRING); + v->v.s = s; + return v; +} + +Val +mk_symbol(char *s) +{ + Val v = mk_val(SYMBOL); + v->v.s = s; + return v; +} + +Val +mk_prim(Prim pr) +{ + Val v = mk_val(PRIMITIVE); + v->v.pr = pr; + return v; +} + +Val +mk_pair(Val a, Val b) +{ + Val ret = mk_val(PAIR); + car(ret) = a; + cdr(ret) = b; + return ret; +} + +Val +mk_list(int n, Val *a) +{ + int i; + Val b = &nil; + for (i = n-1; i >= 0; i--) + b = mk_pair(a[i], b); + return b; +} + +Val +read_int(Str str) +{ + int i = 0; + for (; isdigit(*str->d); str->d++) + i = i * 10 + *str->d - '0'; + return mk_int(i); +} + +Val +read_string(Str str) +{ + int len = 0; + char *s = ++str->d; + for (; *str->d && *str->d++ != '"'; len++); + s[len] = '\0'; + return mk_string(estrdup(s)); +} + +Val +read_symbol(Str str) +{ + int len = 0; + char *sym = str->d; + for (; *str->d && issymbol(*str->d++); len++); + sym[len] = '\0'; + return mk_symbol(estrdup(sym)); +} + +Val +read_list(Str str) +{ + int n = 0; + Val *a = emalloc(sizeof(Val)), b; + str->d++; + skip_spaces(str); + while (*str->d && *str->d != ')') { + a = erealloc(a, (n+1) * sizeof(Val)); /* TODO realloc less */ + a[n++] = read_val(str); + skip_spaces(str); + } + b = mk_list(n, a); + free(a); + skip_spaces(str); + return b; +} + +Val +read_val(Str str) +{ + skip_spaces(str); + if (*str->d == '#') /* TODO check 2nd char */ + return mk_bool(*(++str->d) == 't' ? true : false); + if (isdigit(*str->d)) /* TODO negitive numbers */ + return read_int(str); + if (*str->d == '"') /* TODO fix */ + return read_string(str); + if (issymbol(*str->d)) + return read_symbol(str); + if (*str->d == '(') + return read_list(str); + return NULL; +} + +char * +hints(const char *buf, int *color, int *bold) +{ + struct { char *match, *hint; int color, bold; } hint[] = { + { "(lambda", " (args) (body))", 35, 0 }, + { "(define", " var exp)", 35, 0 }, + { NULL, NULL, 0, 0 } + }; + for (int i = 0; hint[i].match; i++) { + if (!strcasecmp(buf, hint[i].match)){ + *color = hint[i].color; + *bold = hint[i].bold; + return hint[i].hint; + } + } + return NULL; +} + +static Val +tisp_read(char *cmd) +{ + char *line; + struct Str str; + Val ast; + + if (cmd) { + line = estrdup(cmd); + } else { + if (SHOW_HINTS) + linenoiseSetHintsCallback(hints); + if (!(line = linenoise("> "))) + return NULL; + linenoiseHistoryAdd(line); + } + + str.d = line; + ast = read_val(&str); + free(line); + + return ast; +} + +static Val +eval_pair(Hash env, Val v) +{ + int cap = 0, size = 0; + Val *new = emalloc(sizeof(Val)); + while (!nilp(v)) { + new[cap++] = tisp_eval(env, car(v)); + if (cap == size) { + size *= 2; + v = erealloc(v, size*sizeof(Val)); + } + v = cdr(v); + } + Val ret = mk_list(cap, new); + free(new); + return ret; +} + +static Val +tisp_eval(Hash env, Val v) +{ + Val f; + switch (v->t) { + case NIL: + case BOOLEAN: + case INTEGER: + case RATIONAL: + case STRING: + return v; + case SYMBOL: + return hash_get(env, v->v.s); + case PAIR: + f = tisp_eval(env, car(v)); + if (f->t != PRIMITIVE) + die(1, "%s: Attempt to eval non primitive", argv0); + return (*f->v.pr)(env, eval_pair(env, cdr(v))); + default: break; + } + return v; +} + +/* TODO return str for error msgs? */ +static void +tisp_print(Val v) +{ + switch (v->t) { + case NIL: + printf("()"); + break; + case BOOLEAN: + printf(v->v.i ? "#t" : "#f"); + break; + case INTEGER: + printf("%d", v->v.i); + break; + case RATIONAL: + printf("%d/%d", v->v.r.num, v->v.r.den); + break; + case STRING: + printf("\"%s\"", v->v.s); + break; + case SYMBOL: + printf(v->v.s); + break; + case FUNCTION: + printf("(lambda "); + tisp_print(v->v.f.args); + putchar(' '); + tisp_print(v->v.f.body); + putchar(')'); + break; + case PAIR: + putchar('('); + tisp_print(car(v)); + v = cdr(v); + while (!nilp(v)) { + if (v->t == PAIR) { + putchar(' '); + tisp_print(car(v)); + v = cdr(v); + } else { + puts(" . "); + tisp_print(v); + break; + } + } + putchar(')'); + break; + default: + printf("%s: Could not print value type [%d]", argv0, v->t); + } +} + +static Val +add(Hash env, Val args) +{ + Val v; + int i = 0; + for (v = args; !nilp(v); v = cdr(v)) + i += car(v)->v.i; + return mk_int(i); +} + +static Hash +init_env(void) +{ + Hash h = hash_new(64); + hash_add(h, "+", mk_prim(add)); + return h; +} + +void +val_free(Val v) +{ + if (v->t == PAIR) { + val_free(car(v)); + val_free(cdr(v)); + } + if (v->t != NIL) + free(v); +} + +static void +usage(const int eval) +{ + die(eval, "usage: %s [-hv] [CODE]", argv0); +} + +int +main(int argc, char *argv[]) +{ + ARGBEGIN { + case 'h': + usage(0); + case 'v': + printf("%s v%s (c) 2017-2018 Ed van Bruggen\n", argv0, VERSION); + return 0; + default: + usage(1); + } ARGEND; + + char *str = NULL; + Val v; + Hash env = init_env(); + + nil.t = NIL; + + if (argc > 0 && argv[0][0] == '(') + str = argv[0]; + + while ((v = tisp_read(str))) { + v = tisp_eval(env, v); + + tisp_print(v); + putchar('\n'); + val_free(v); + if (str) break; + } + + for (; env; env = env->next) { + for (int i = 0; i < env->cap; i++) + if (env->items[i].key) + val_free(env->items[i].val); + free(env->items); + free(env); + } + + return 0; +} diff --git a/util.c b/util.c @@ -0,0 +1,75 @@ +/* See LICENSE file for copyright and license details. */ +#include <assert.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "util.h" + +void * +ecalloc(size_t nmemb, size_t size) +{ + void *p; + + if (!(p = calloc(nmemb, size))) + die(1, "calloc:"); + + return p; +} + +void * +emalloc(size_t size) +{ + void *p; + + if (!(p = malloc(size))) + die(1, "malloc:"); + + return p; +} + +void * +erealloc(void *p, size_t size) +{ + if (!(p = realloc(p, size))) + die(1, "realloc:"); + + return p; +} + +char * +estrdup(char *s) +{ + if (!(s = strdup(s))) + die(1, "strdup:"); + + return s; +} + +void +efree(void *p) +{ + if (p) + free(p); +} + +void +die(int eval, const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + + if (fmt[0] && fmt[strlen(fmt)-1] == ':') { + fputc(' ', stderr); + perror(NULL); + } else { + fputc('\n', stderr); + } + + if (eval > -1) + exit(eval); +} diff --git a/util.h b/util.h @@ -0,0 +1,14 @@ +/* See LICENSE file for copyright and license details. */ + +#define MAX(A, B) ((A) > (B) ? (A) : (B)) +#define MIN(A, B) ((A) < (B) ? (A) : (B)) +#define BETWEEN(X, A, B) ((A) <= (X) && (X) <= (B)) +#define LEN(X) (sizeof(X) / sizeof((X)[0])) + +void *ecalloc(size_t nmemb, size_t size); +void *emalloc(size_t size); +void *erealloc(void *p, size_t size); +char *estrdup(char *s); +void efree(void *p); + +void die(int eval, const char *fmt, ...);