--- /dev/null
+/*
+ * Copyright (c) 1993-1994 by Xerox Corporation. All rights reserved.
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ *
+ * Author: Hans-J. Boehm (boehm@parc.xerox.com)
+ */
+/*
+ * A really simple-minded text editor based on cords.
+ * Things it does right:
+ * No size bounds.
+ * Inbounded undo.
+ * Shouldn't crash no matter what file you invoke it on (e.g. /vmunix)
+ * (Make sure /vmunix is not writable before you try this.)
+ * Scrolls horizontally.
+ * Things it does wrong:
+ * It doesn't handle tabs reasonably (use "expand" first).
+ * The command set is MUCH too small.
+ * The redisplay algorithm doesn't let curses do the scrolling.
+ * The rule for moving the window over the file is suboptimal.
+ */
+/* Boehm, February 6, 1995 12:27 pm PST */
+
+/* Boehm, May 19, 1994 2:20 pm PDT */
+#include <stdio.h>
+#include "gc.h"
+#include "cord.h"
+
+#ifdef THINK_C
+#define MACINTOSH
+#include <ctype.h>
+#endif
+
+#if (defined(__BORLANDC__) || defined(__CYGWIN__)) && !defined(WIN32)
+ /* If this is DOS or win16, we'll fail anyway. */
+ /* Might as well assume win32. */
+# define WIN32
+#endif
+
+#if defined(WIN32)
+# include <windows.h>
+# include "de_win.h"
+#elif defined(MACINTOSH)
+# include <console.h>
+/* curses emulation. */
+# define initscr()
+# define endwin()
+# define nonl()
+# define noecho() csetmode(C_NOECHO, stdout)
+# define cbreak() csetmode(C_CBREAK, stdout)
+# define refresh()
+# define addch(c) putchar(c)
+# define standout() cinverse(1, stdout)
+# define standend() cinverse(0, stdout)
+# define move(line,col) cgotoxy(col + 1, line + 1, stdout)
+# define clrtoeol() ccleol(stdout)
+# define de_error(s) { fprintf(stderr, s); getchar(); }
+# define LINES 25
+# define COLS 80
+#else
+# include <curses.h>
+# define de_error(s) { fprintf(stderr, s); sleep(2); }
+#endif
+#include "de_cmds.h"
+
+/* List of line number to position mappings, in descending order. */
+/* There may be holes. */
+typedef struct LineMapRep {
+ int line;
+ size_t pos;
+ struct LineMapRep * previous;
+} * line_map;
+
+/* List of file versions, one per edit operation */
+typedef struct HistoryRep {
+ CORD file_contents;
+ struct HistoryRep * previous;
+ line_map map; /* Invalid for first record "now" */
+} * history;
+
+history now = 0;
+CORD current; /* == now -> file_contents. */
+size_t current_len; /* Current file length. */
+line_map current_map = 0; /* Current line no. to pos. map */
+size_t current_map_size = 0; /* Number of current_map entries. */
+ /* Not always accurate, but reset */
+ /* by prune_map. */
+# define MAX_MAP_SIZE 3000
+
+/* Current display position */
+int dis_line = 0;
+int dis_col = 0;
+
+# define ALL -1
+# define NONE - 2
+int need_redisplay = 0; /* Line that needs to be redisplayed. */
+
+
+/* Current cursor position. Always within file. */
+int line = 0;
+int col = 0;
+size_t file_pos = 0; /* Character position corresponding to cursor. */
+
+/* Invalidate line map for lines > i */
+void invalidate_map(int i)
+{
+ while(current_map -> line > i) {
+ current_map = current_map -> previous;
+ current_map_size--;
+ }
+}
+
+/* Reduce the number of map entries to save space for huge files. */
+/* This also affects maps in histories. */
+void prune_map()
+{
+ line_map map = current_map;
+ int start_line = map -> line;
+
+ current_map_size = 0;
+ for(; map != 0; map = map -> previous) {
+ current_map_size++;
+ if (map -> line < start_line - LINES && map -> previous != 0) {
+ map -> previous = map -> previous -> previous;
+ }
+ }
+}
+/* Add mapping entry */
+void add_map(int line, size_t pos)
+{
+ line_map new_map = GC_NEW(struct LineMapRep);
+
+ if (current_map_size >= MAX_MAP_SIZE) prune_map();
+ new_map -> line = line;
+ new_map -> pos = pos;
+ new_map -> previous = current_map;
+ current_map = new_map;
+ current_map_size++;
+}
+
+
+
+/* Return position of column *c of ith line in */
+/* current file. Adjust *c to be within the line.*/
+/* A 0 pointer is taken as 0 column. */
+/* Returns CORD_NOT_FOUND if i is too big. */
+/* Assumes i > dis_line. */
+size_t line_pos(int i, int *c)
+{
+ int j;
+ size_t cur;
+ size_t next;
+ line_map map = current_map;
+
+ while (map -> line > i) map = map -> previous;
+ if (map -> line < i - 2) /* rebuild */ invalidate_map(i);
+ for (j = map -> line, cur = map -> pos; j < i;) {
+ cur = CORD_chr(current, cur, '\n');
+ if (cur == current_len-1) return(CORD_NOT_FOUND);
+ cur++;
+ if (++j > current_map -> line) add_map(j, cur);
+ }
+ if (c != 0) {
+ next = CORD_chr(current, cur, '\n');
+ if (next == CORD_NOT_FOUND) next = current_len - 1;
+ if (next < cur + *c) {
+ *c = next - cur;
+ }
+ cur += *c;
+ }
+ return(cur);
+}
+
+void add_hist(CORD s)
+{
+ history new_file = GC_NEW(struct HistoryRep);
+
+ new_file -> file_contents = current = s;
+ current_len = CORD_len(s);
+ new_file -> previous = now;
+ if (now != 0) now -> map = current_map;
+ now = new_file;
+}
+
+void del_hist(void)
+{
+ now = now -> previous;
+ current = now -> file_contents;
+ current_map = now -> map;
+ current_len = CORD_len(current);
+}
+
+/* Current screen_contents; a dynamically allocated array of CORDs */
+CORD * screen = 0;
+int screen_size = 0;
+
+# ifndef WIN32
+/* Replace a line in the curses stdscr. All control characters are */
+/* displayed as upper case characters in standout mode. This isn't */
+/* terribly appropriate for tabs. */
+void replace_line(int i, CORD s)
+{
+ register int c;
+ CORD_pos p;
+ size_t len = CORD_len(s);
+
+ if (screen == 0 || LINES > screen_size) {
+ screen_size = LINES;
+ screen = (CORD *)GC_MALLOC(screen_size * sizeof(CORD));
+ }
+# if !defined(MACINTOSH)
+ /* A gross workaround for an apparent curses bug: */
+ if (i == LINES-1 && len == COLS) {
+ s = CORD_substr(s, 0, CORD_len(s) - 1);
+ }
+# endif
+ if (CORD_cmp(screen[i], s) != 0) {
+ move(i, 0); clrtoeol(); move(i,0);
+
+ CORD_FOR (p, s) {
+ c = CORD_pos_fetch(p) & 0x7f;
+ if (iscntrl(c)) {
+ standout(); addch(c + 0x40); standend();
+ } else {
+ addch(c);
+ }
+ }
+ screen[i] = s;
+ }
+}
+#else
+# define replace_line(i,s) invalidate_line(i)
+#endif
+
+/* Return up to COLS characters of the line of s starting at pos, */
+/* returning only characters after the given column. */
+CORD retrieve_line(CORD s, size_t pos, unsigned column)
+{
+ CORD candidate = CORD_substr(s, pos, column + COLS);
+ /* avoids scanning very long lines */
+ int eol = CORD_chr(candidate, 0, '\n');
+ int len;
+
+ if (eol == CORD_NOT_FOUND) eol = CORD_len(candidate);
+ len = (int)eol - (int)column;
+ if (len < 0) len = 0;
+ return(CORD_substr(s, pos + column, len));
+}
+
+# ifdef WIN32
+# define refresh();
+
+ CORD retrieve_screen_line(int i)
+ {
+ register size_t pos;
+
+ invalidate_map(dis_line + LINES); /* Prune search */
+ pos = line_pos(dis_line + i, 0);
+ if (pos == CORD_NOT_FOUND) return(CORD_EMPTY);
+ return(retrieve_line(current, pos, dis_col));
+ }
+# endif
+
+/* Display the visible section of the current file */
+void redisplay(void)
+{
+ register int i;
+
+ invalidate_map(dis_line + LINES); /* Prune search */
+ for (i = 0; i < LINES; i++) {
+ if (need_redisplay == ALL || need_redisplay == i) {
+ register size_t pos = line_pos(dis_line + i, 0);
+
+ if (pos == CORD_NOT_FOUND) break;
+ replace_line(i, retrieve_line(current, pos, dis_col));
+ if (need_redisplay == i) goto done;
+ }
+ }
+ for (; i < LINES; i++) replace_line(i, CORD_EMPTY);
+done:
+ refresh();
+ need_redisplay = NONE;
+}
+
+int dis_granularity;
+
+/* Update dis_line, dis_col, and dis_pos to make cursor visible. */
+/* Assumes line, col, dis_line, dis_pos are in bounds. */
+void normalize_display()
+{
+ int old_line = dis_line;
+ int old_col = dis_col;
+
+ dis_granularity = 1;
+ if (LINES > 15 && COLS > 15) dis_granularity = 2;
+ while (dis_line > line) dis_line -= dis_granularity;
+ while (dis_col > col) dis_col -= dis_granularity;
+ while (line >= dis_line + LINES) dis_line += dis_granularity;
+ while (col >= dis_col + COLS) dis_col += dis_granularity;
+ if (old_line != dis_line || old_col != dis_col) {
+ need_redisplay = ALL;
+ }
+}
+
+# if defined(WIN32)
+# elif defined(MACINTOSH)
+# define move_cursor(x,y) cgotoxy(x + 1, y + 1, stdout)
+# else
+# define move_cursor(x,y) move(y,x)
+# endif
+
+/* Adjust display so that cursor is visible; move cursor into position */
+/* Update screen if necessary. */
+void fix_cursor(void)
+{
+ normalize_display();
+ if (need_redisplay != NONE) redisplay();
+ move_cursor(col - dis_col, line - dis_line);
+ refresh();
+# ifndef WIN32
+ fflush(stdout);
+# endif
+}
+
+/* Make sure line, col, and dis_pos are somewhere inside file. */
+/* Recompute file_pos. Assumes dis_pos is accurate or past eof */
+void fix_pos()
+{
+ int my_col = col;
+
+ if ((size_t)line > current_len) line = current_len;
+ file_pos = line_pos(line, &my_col);
+ if (file_pos == CORD_NOT_FOUND) {
+ for (line = current_map -> line, file_pos = current_map -> pos;
+ file_pos < current_len;
+ line++, file_pos = CORD_chr(current, file_pos, '\n') + 1);
+ line--;
+ file_pos = line_pos(line, &col);
+ } else {
+ col = my_col;
+ }
+}
+
+#if defined(WIN32)
+# define beep() Beep(1000 /* Hz */, 300 /* msecs */)
+#elif defined(MACINTOSH)
+# define beep() SysBeep(1)
+#else
+/*
+ * beep() is part of some curses packages and not others.
+ * We try to match the type of the builtin one, if any.
+ */
+#ifdef __STDC__
+ int beep(void)
+#else
+ int beep()
+#endif
+{
+ putc('\007', stderr);
+ return(0);
+}
+#endif
+
+# define NO_PREFIX -1
+# define BARE_PREFIX -2
+int repeat_count = NO_PREFIX; /* Current command prefix. */
+
+int locate_mode = 0; /* Currently between 2 ^Ls */
+CORD locate_string = CORD_EMPTY; /* Current search string. */
+
+char * arg_file_name;
+
+#ifdef WIN32
+/* Change the current position to whatever is currently displayed at */
+/* the given SCREEN coordinates. */
+void set_position(int c, int l)
+{
+ line = l + dis_line;
+ col = c + dis_col;
+ fix_pos();
+ move_cursor(col - dis_col, line - dis_line);
+}
+#endif /* WIN32 */
+
+/* Perform the command associated with character c. C may be an */
+/* integer > 256 denoting a windows command, one of the above control */
+/* characters, or another ASCII character to be used as either a */
+/* character to be inserted, a repeat count, or a search string, */
+/* depending on the current state. */
+void do_command(int c)
+{
+ int i;
+ int need_fix_pos;
+ FILE * out;
+
+ if ( c == '\r') c = '\n';
+ if (locate_mode) {
+ size_t new_pos;
+
+ if (c == LOCATE) {
+ locate_mode = 0;
+ locate_string = CORD_EMPTY;
+ return;
+ }
+ locate_string = CORD_cat_char(locate_string, (char)c);
+ new_pos = CORD_str(current, file_pos - CORD_len(locate_string) + 1,
+ locate_string);
+ if (new_pos != CORD_NOT_FOUND) {
+ need_redisplay = ALL;
+ new_pos += CORD_len(locate_string);
+ for (;;) {
+ file_pos = line_pos(line + 1, 0);
+ if (file_pos > new_pos) break;
+ line++;
+ }
+ col = new_pos - line_pos(line, 0);
+ file_pos = new_pos;
+ fix_cursor();
+ } else {
+ locate_string = CORD_substr(locate_string, 0,
+ CORD_len(locate_string) - 1);
+ beep();
+ }
+ return;
+ }
+ if (c == REPEAT) {
+ repeat_count = BARE_PREFIX; return;
+ } else if (c < 0x100 && isdigit(c)){
+ if (repeat_count == BARE_PREFIX) {
+ repeat_count = c - '0'; return;
+ } else if (repeat_count != NO_PREFIX) {
+ repeat_count = 10 * repeat_count + c - '0'; return;
+ }
+ }
+ if (repeat_count == NO_PREFIX) repeat_count = 1;
+ if (repeat_count == BARE_PREFIX && (c == UP || c == DOWN)) {
+ repeat_count = LINES - dis_granularity;
+ }
+ if (repeat_count == BARE_PREFIX) repeat_count = 8;
+ need_fix_pos = 0;
+ for (i = 0; i < repeat_count; i++) {
+ switch(c) {
+ case LOCATE:
+ locate_mode = 1;
+ break;
+ case TOP:
+ line = col = file_pos = 0;
+ break;
+ case UP:
+ if (line != 0) {
+ line--;
+ need_fix_pos = 1;
+ }
+ break;
+ case DOWN:
+ line++;
+ need_fix_pos = 1;
+ break;
+ case LEFT:
+ if (col != 0) {
+ col--; file_pos--;
+ }
+ break;
+ case RIGHT:
+ if (CORD_fetch(current, file_pos) == '\n') break;
+ col++; file_pos++;
+ break;
+ case UNDO:
+ del_hist();
+ need_redisplay = ALL; need_fix_pos = 1;
+ break;
+ case BS:
+ if (col == 0) {
+ beep();
+ break;
+ }
+ col--; file_pos--;
+ /* fall through: */
+ case DEL:
+ if (file_pos == current_len-1) break;
+ /* Can't delete trailing newline */
+ if (CORD_fetch(current, file_pos) == '\n') {
+ need_redisplay = ALL; need_fix_pos = 1;
+ } else {
+ need_redisplay = line - dis_line;
+ }
+ add_hist(CORD_cat(
+ CORD_substr(current, 0, file_pos),
+ CORD_substr(current, file_pos+1, current_len)));
+ invalidate_map(line);
+ break;
+ case WRITE:
+ {
+ CORD name = CORD_cat(CORD_from_char_star(arg_file_name),
+ ".new");
+
+ if ((out = fopen(CORD_to_const_char_star(name), "wb")) == NULL
+ || CORD_put(current, out) == EOF) {
+ de_error("Write failed\n");
+ need_redisplay = ALL;
+ } else {
+ fclose(out);
+ }
+ }
+ break;
+ default:
+ {
+ CORD left_part = CORD_substr(current, 0, file_pos);
+ CORD right_part = CORD_substr(current, file_pos, current_len);
+
+ add_hist(CORD_cat(CORD_cat_char(left_part, (char)c),
+ right_part));
+ invalidate_map(line);
+ if (c == '\n') {
+ col = 0; line++; file_pos++;
+ need_redisplay = ALL;
+ } else {
+ col++; file_pos++;
+ need_redisplay = line - dis_line;
+ }
+ break;
+ }
+ }
+ }
+ if (need_fix_pos) fix_pos();
+ fix_cursor();
+ repeat_count = NO_PREFIX;
+}
+
+/* OS independent initialization */
+
+void generic_init(void)
+{
+ FILE * f;
+ CORD initial;
+
+ if ((f = fopen(arg_file_name, "rb")) == NULL) {
+ initial = "\n";
+ } else {
+ initial = CORD_from_file(f);
+ if (initial == CORD_EMPTY
+ || CORD_fetch(initial, CORD_len(initial)-1) != '\n') {
+ initial = CORD_cat(initial, "\n");
+ }
+ }
+ add_map(0,0);
+ add_hist(initial);
+ now -> map = current_map;
+ now -> previous = now; /* Can't back up further: beginning of the world */
+ need_redisplay = ALL;
+ fix_cursor();
+}
+
+#ifndef WIN32
+
+main(argc, argv)
+int argc;
+char ** argv;
+{
+ int c;
+
+#if defined(MACINTOSH)
+ console_options.title = "\pDumb Editor";
+ cshow(stdout);
+ argc = ccommand(&argv);
+#endif
+ GC_INIT();
+
+ if (argc != 2) goto usage;
+ arg_file_name = argv[1];
+ setvbuf(stdout, GC_MALLOC_ATOMIC(8192), _IOFBF, 8192);
+ initscr();
+ noecho(); nonl(); cbreak();
+ generic_init();
+ while ((c = getchar()) != QUIT) {
+ if (c == EOF) break;
+ do_command(c);
+ }
+done:
+ move(LINES-1, 0);
+ clrtoeol();
+ refresh();
+ nl();
+ echo();
+ endwin();
+ exit(0);
+usage:
+ fprintf(stderr, "Usage: %s file\n", argv[0]);
+ fprintf(stderr, "Cursor keys: ^B(left) ^F(right) ^P(up) ^N(down)\n");
+ fprintf(stderr, "Undo: ^U Write to <file>.new: ^W");
+ fprintf(stderr, "Quit:^D Repeat count: ^R[n]\n");
+ fprintf(stderr, "Top: ^T Locate (search, find): ^L text ^L\n");
+ exit(1);
+}
+
+#endif /* !WIN32 */
projects / hs-boehmgc.git / blobdiff