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edit.c
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edit.c
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//
// edit.c
//
// Text editor
//
// Copyright (C) 2002 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. 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.
// 3. Neither the name of the project nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// 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 OWNER 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.
//
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#ifdef SANOS
#include <os.h>
#endif
#ifdef __linux__
#include <sys/ioctl.h>
#include <termios.h>
#define O_BINARY 0
int linux_console = 0;
#endif
#define MINEXTEND 32768
#define LINEBUF_EXTRA 32
#ifndef TABSIZE
#define TABSIZE 8
#endif
#ifndef INDENT
#define INDENT " "
#endif
#define CLRSCR "\033[0J"
#define CLREOL "\033[K"
#define GOTOXY "\033[%d;%dH"
#define RESET_COLOR "\033[0m"
#ifdef COLOR
#define TEXT_COLOR "\033[44m\033[37m\033[1m"
#define SELECT_COLOR "\033[47m\033[37m\033[1m"
#define STATUS_COLOR "\033[0m\033[47m\033[30m"
#else
#define TEXT_COLOR "\033[0m"
#define SELECT_COLOR "\033[7m\033[1m"
#define STATUS_COLOR "\033[1m\033[7m"
#endif
//
// Key codes
//
#define KEY_BACKSPACE 0x101
#define KEY_ESC 0x102
#define KEY_INS 0x103
#define KEY_DEL 0x104
#define KEY_LEFT 0x105
#define KEY_RIGHT 0x106
#define KEY_UP 0x107
#define KEY_DOWN 0x108
#define KEY_HOME 0x109
#define KEY_END 0x10A
#define KEY_ENTER 0x10B
#define KEY_TAB 0x10C
#define KEY_PGUP 0x10D
#define KEY_PGDN 0x10E
#define KEY_CTRL_LEFT 0x10F
#define KEY_CTRL_RIGHT 0x110
#define KEY_CTRL_UP 0x111
#define KEY_CTRL_DOWN 0x112
#define KEY_CTRL_HOME 0x113
#define KEY_CTRL_END 0x114
#define KEY_CTRL_TAB 0x115
#define KEY_SHIFT_LEFT 0x116
#define KEY_SHIFT_RIGHT 0x117
#define KEY_SHIFT_UP 0x118
#define KEY_SHIFT_DOWN 0x119
#define KEY_SHIFT_PGUP 0x11A
#define KEY_SHIFT_PGDN 0x11B
#define KEY_SHIFT_HOME 0x11C
#define KEY_SHIFT_END 0x11D
#define KEY_SHIFT_TAB 0x11E
#define KEY_SHIFT_CTRL_LEFT 0x11F
#define KEY_SHIFT_CTRL_RIGHT 0x120
#define KEY_SHIFT_CTRL_UP 0x121
#define KEY_SHIFT_CTRL_DOWN 0x122
#define KEY_SHIFT_CTRL_HOME 0x123
#define KEY_SHIFT_CTRL_END 0x124
#define KEY_F1 0x125
#define KEY_F3 0x126
#define KEY_F5 0x127
#define KEY_UNKNOWN 0xFFF
#define ctrl(c) ((c) - 0x60)
//
// Editor data block
//
// Structure of split buffer:
//
// +------------------+------------------+------------------+
// | text before gap | gap | text after gap |
// +------------------+------------------+------------------+
// ^ ^ ^ ^
// | | | |
// start gap rest end
//
struct env;
struct undo {
int pos; // Editor position
int erased; // Size of erased contents
int inserted; // Size of inserted contents
unsigned char *undobuf; // Erased contents for undo
unsigned char *redobuf; // Inserted contents for redo
struct undo *next; // Next undo buffer
struct undo *prev; // Previous undo buffer
};
struct editor {
unsigned char *start; // Start of text buffer
unsigned char *gap; // Start of gap
unsigned char *rest; // End of gap
unsigned char *end; // End of text buffer
int toppos; // Text position for current top screen line
int topline; // Line number for top of screen
int margin; // Position for leftmost column on screen
int linepos; // Text position for current line
int line; // Current document line
int col; // Current document column
int lastcol; // Remembered column from last horizontal navigation
int anchor; // Anchor position for selection
struct undo *undohead; // Start of undo buffer list
struct undo *undotail; // End of undo buffer list
struct undo *undo; // Undo/redo boundary
int refresh; // Flag to trigger screen redraw
int lineupdate; // Flag to trigger redraw of current line
int dirty; // Dirty flag is set when the editor buffer has been changed
int newfile; // File is a new file
int permissions; // File permissions
struct env *env; // Reference to global editor environment
struct editor *next; // Next editor
struct editor *prev; // Previous editor
char filename[FILENAME_MAX];
};
struct env {
struct editor *current; // Current editor
unsigned char *clipboard; // Clipboard
int clipsize; // Clipboard size
unsigned char *search; // Search text
unsigned char *linebuf; // Scratch buffer
int cols; // Console columns
int lines; // Console lines
int untitled; // Counter for untitled files
};
//
// Editor buffer functions
//
void clear_undo(struct editor *ed) {
struct undo *undo = ed->undohead;
while (undo) {
struct undo *next = undo->next;
free(undo->undobuf);
free(undo->redobuf);
free(undo);
undo = next;
}
ed->undohead = ed->undotail = ed->undo = NULL;
}
void reset_undo(struct editor *ed) {
while (ed->undotail != ed->undo) {
struct undo *undo = ed->undotail;
if (!undo) {
ed->undohead = NULL;
ed->undotail = NULL;
break;
}
ed->undotail = undo->prev;
if (undo->prev) undo->prev->next = NULL;
free(undo->undobuf);
free(undo->redobuf);
free(undo);
}
ed->undo = ed->undotail;
}
struct editor *create_editor(struct env *env) {
struct editor *ed = (struct editor *) malloc(sizeof(struct editor));
memset(ed, 0, sizeof(struct editor));
if (env->current) {
ed->next = env->current->next;
ed->prev = env->current;
env->current->next->prev = ed;
env->current->next = ed;
} else {
ed->next = ed->prev = ed;
}
ed->env = env;
env->current = ed;
return ed;
}
void delete_editor(struct editor *ed) {
if (ed->next == ed) {
ed->env->current = NULL;
} else {
ed->env->current = ed->prev;
}
ed->next->prev = ed->prev;
ed->prev->next = ed->next;
if (ed->start) free(ed->start);
clear_undo(ed);
free(ed);
}
struct editor *find_editor(struct env *env, char *filename) {
char fn[FILENAME_MAX];
struct editor *ed = env->current;
struct editor *start = ed;
if (!realpath(filename, fn)) strcpy(fn, filename);
do {
if (strcmp(fn, ed->filename) == 0) return ed;
ed = ed->next;
} while (ed != start);
return NULL;
}
int new_file(struct editor *ed, char *filename) {
if (*filename) {
strcpy(ed->filename, filename);
} else {
sprintf(ed->filename, "Untitled-%d", ++ed->env->untitled);
ed->newfile = 1;
}
ed->permissions = 0644;
ed->start = (unsigned char *) malloc(MINEXTEND);
if (!ed->start) return -1;
#ifdef DEBUG
memset(ed->start, 0, MINEXTEND);
#endif
ed->gap = ed->start;
ed->rest = ed->end = ed->gap + MINEXTEND;
ed->anchor = -1;
return 0;
}
int load_file(struct editor *ed, char *filename) {
struct stat statbuf;
int length;
int f;
if (!realpath(filename, ed->filename)) return -1;
f = open(ed->filename, O_RDONLY | O_BINARY);
if (f < 0) return -1;
if (fstat(f, &statbuf) < 0) goto err;
length = statbuf.st_size;
ed->permissions = statbuf.st_mode & 0777;
ed->start = (unsigned char *) malloc(length + MINEXTEND);
if (!ed->start) goto err;
#ifdef DEBUG
memset(ed->start, 0, length + MINEXTEND);
#endif
if (read(f, ed->start, length) != length) goto err;
ed->gap = ed->start + length;
ed->rest = ed->end = ed->gap + MINEXTEND;
ed->anchor = -1;
close(f);
return 0;
err:
close(f);
if (ed->start) {
free(ed->start);
ed->start = NULL;
}
return -1;
}
int save_file(struct editor *ed) {
int f;
f = open(ed->filename, O_CREAT | O_TRUNC | O_WRONLY, ed->permissions);
if (f < 0) return -1;
if (write(f, ed->start, ed->gap - ed->start) != ed->gap - ed->start) goto err;
if (write(f, ed->rest, ed->end - ed->rest) != ed->end - ed->rest) goto err;
close(f);
ed->dirty = 0;
clear_undo(ed);
return 0;
err:
close(f);
return -1;
}
int text_length(struct editor *ed) {
return (ed->gap - ed->start) + (ed->end - ed->rest);
}
unsigned char *text_ptr(struct editor *ed, int pos) {
unsigned char *p = ed->start + pos;
if (p >= ed->gap) p += (ed->rest - ed->gap);
return p;
}
void move_gap(struct editor *ed, int pos, int minsize) {
int gapsize = ed->rest - ed->gap;
unsigned char *p = text_ptr(ed, pos);
if (minsize < 0) minsize = 0;
if (minsize <= gapsize) {
if (p != ed->rest) {
if (p < ed->gap) {
memmove(p + gapsize, p, ed->gap - p);
} else {
memmove(ed->gap, ed->rest, p - ed->rest);
}
ed->gap = ed->start + pos;
ed->rest = ed->gap + gapsize;
}
} else {
int newsize;
unsigned char *start;
unsigned char *gap;
unsigned char *rest;
unsigned char *end;
if (gapsize + MINEXTEND > minsize) minsize = gapsize + MINEXTEND;
newsize = (ed->end - ed->start) - gapsize + minsize;
start = (unsigned char *) malloc(newsize); // TODO check for out of memory
gap = start + pos;
rest = gap + minsize;
end = start + newsize;
if (p < ed->gap) {
memcpy(start, ed->start, pos);
memcpy(rest, p, ed->gap - p);
memcpy(end - (ed->end - ed->rest), ed->rest, ed->end - ed->rest);
} else {
memcpy(start, ed->start, ed->gap - ed->start);
memcpy(start + (ed->gap - ed->start), ed->rest, p - ed->rest);
memcpy(rest, p, ed->end - p);
}
free(ed->start);
ed->start = start;
ed->gap = gap;
ed->rest = rest;
ed->end = end;
}
#ifdef DEBUG
memset(ed->gap, 0, ed->rest - ed->gap);
#endif
}
void close_gap(struct editor *ed) {
int len = text_length(ed);
move_gap(ed, len, 1);
ed->start[len] = 0;
}
int get(struct editor *ed, int pos) {
unsigned char *p = text_ptr(ed, pos);
if (p >= ed->end) return -1;
return *p;
}
int compare(struct editor *ed, unsigned char *buf, int pos, int len) {
unsigned char *bufptr = buf;
unsigned char *p = ed->start + pos;
if (p >= ed->gap) p += (ed->rest - ed->gap);
while (len > 0) {
if (p == ed->end) return 0;
if (*bufptr++ != *p) return 0;
len--;
if (++p == ed->gap) p = ed->rest;
}
return 1;
}
int copy(struct editor *ed, unsigned char *buf, int pos, int len) {
unsigned char *bufptr = buf;
unsigned char *p = ed->start + pos;
if (p >= ed->gap) p += (ed->rest - ed->gap);
while (len > 0) {
if (p == ed->end) break;
*bufptr++ = *p;
len--;
if (++p == ed->gap) p = ed->rest;
}
return bufptr - buf;
}
void replace(struct editor *ed, int pos, int len, unsigned char *buf, int bufsize, int doundo) {
unsigned char *p;
struct undo *undo;
// Store undo information
if (doundo) {
reset_undo(ed);
undo = ed->undotail;
if (undo && len == 0 && bufsize == 1 && undo->erased == 0 && pos == undo->pos + undo->inserted) {
// Insert character at end of current redo buffer
undo->redobuf = realloc(undo->redobuf, undo->inserted + 1);
undo->redobuf[undo->inserted] = *buf;
undo->inserted++;
} else if (undo && len == 1 && bufsize == 0 && undo->inserted == 0 && pos == undo->pos) {
// Erase character at end of current undo buffer
undo->undobuf = realloc(undo->undobuf, undo->erased + 1);
undo->undobuf[undo->erased] = get(ed, pos);
undo->erased++;
} else if (undo && len == 1 && bufsize == 0 && undo->inserted == 0 && pos == undo->pos - 1) {
// Erase character at beginning of current undo buffer
undo->pos--;
undo->undobuf = realloc(undo->undobuf, undo->erased + 1);
memmove(undo->undobuf + 1, undo->undobuf, undo->erased);
undo->undobuf[0] = get(ed, pos);
undo->erased++;
} else {
// Create new undo buffer
undo = (struct undo *) malloc(sizeof(struct undo));
if (ed->undotail) ed->undotail->next = undo;
undo->prev = ed->undotail;
undo->next = NULL;
ed->undotail = ed->undo = undo;
if (!ed->undohead) ed->undohead = undo;
undo->pos = pos;
undo->erased = len;
undo->inserted = bufsize;
undo->undobuf = undo->redobuf = NULL;
if (len > 0) {
undo->undobuf = malloc(len);
copy(ed, undo->undobuf, pos, len);
}
if (bufsize > 0) {
undo->redobuf = malloc(bufsize);
memcpy(undo->redobuf, buf, bufsize);
}
}
}
p = ed->start + pos;
if (bufsize == 0 && p <= ed->gap && p + len >= ed->gap) {
// Handle deletions at the edges of the gap
ed->rest += len - (ed->gap - p);
ed->gap = p;
} else {
// Move the gap
move_gap(ed, pos + len, bufsize - len);
// Replace contents
memcpy(ed->start + pos, buf, bufsize);
ed->gap = ed->start + pos + bufsize;
}
// Mark buffer as dirty
ed->dirty = 1;
}
void insert(struct editor *ed, int pos, unsigned char *buf, int bufsize) {
replace(ed, pos, 0, buf, bufsize, 1);
}
void erase(struct editor *ed, int pos, int len) {
replace(ed, pos, len, NULL, 0, 1);
}
//
// Navigation functions
//
int line_length(struct editor *ed, int linepos) {
int pos = linepos;
while (1) {
int ch = get(ed, pos);
if (ch < 0 || ch == '\n' || ch == '\r') break;
pos++;
}
return pos - linepos;
}
int line_start(struct editor *ed, int pos) {
while (1) {
if (pos == 0) break;
if (get(ed, pos - 1) == '\n') break;
pos--;
}
return pos;
}
int next_line(struct editor *ed, int pos) {
while (1) {
int ch = get(ed, pos);
if (ch < 0) return -1;
pos++;
if (ch == '\n') return pos;
}
}
int prev_line(struct editor *ed, int pos) {
if (pos == 0) return -1;
while (pos > 0) {
int ch = get(ed, --pos);
if (ch == '\n') break;
}
while (pos > 0) {
int ch = get(ed, --pos);
if (ch == '\n') return pos + 1;
}
return 0;
}
int column(struct editor *ed, int linepos, int col) {
unsigned char *p = text_ptr(ed, linepos);
int c = 0;
while (col > 0) {
if (p == ed->end) break;
if (*p == '\t') {
int spaces = TABSIZE - c % TABSIZE;
c += spaces;
} else {
c++;
}
col--;
if (++p == ed->gap) p = ed->rest;
}
return c;
}
void moveto(struct editor *ed, int pos, int center) {
int scroll = 0;
for (;;) {
int cur = ed->linepos + ed->col;
if (pos < cur) {
if (pos >= ed->linepos) {
ed->col = pos - ed->linepos;
} else {
ed->col = 0;
ed->linepos = prev_line(ed, ed->linepos);
ed->line--;
if (ed->topline > ed->line) {
ed->toppos = ed->linepos;
ed->topline--;
ed->refresh = 1;
scroll = 1;
}
}
} else if (pos > cur) {
int next = next_line(ed, ed->linepos);
if (next == -1) {
ed->col = line_length(ed, ed->linepos);
break;
} else if (pos < next) {
ed->col = pos - ed->linepos;
} else {
ed->col = 0;
ed->linepos = next;
ed->line++;
if (ed->line >= ed->topline + ed->env->lines) {
ed->toppos = next_line(ed, ed->toppos);
ed->topline++;
ed->refresh = 1;
scroll = 1;
}
}
} else {
break;
}
}
if (scroll && center) {
int tl = ed->line - ed->env->lines / 2;
if (tl < 0) tl = 0;
for (;;) {
if (ed->topline > tl) {
ed->toppos = prev_line(ed, ed->toppos);
ed->topline--;
} else if (ed->topline < tl) {
ed->toppos = next_line(ed, ed->toppos);
ed->topline++;
} else {
break;
}
}
}
}
//
// Text selection
//
int get_selection(struct editor *ed, int *start, int *end) {
if (ed->anchor == -1) {
*start = *end = -1;
return 0;
} else {
int pos = ed->linepos + ed->col;
if (pos == ed->anchor) {
*start = *end = -1;
return 0;
} else if (pos < ed->anchor) {
*start = pos;
*end = ed->anchor;
} else {
*start = ed->anchor;
*end = pos;
}
}
return 1;
}
int get_selected_text(struct editor *ed, char *buffer, int size) {
int selstart, selend, len;
if (!get_selection(ed, &selstart, &selend)) return 0;
len = selend - selstart;
if (len >= size) return 0;
copy(ed, buffer, selstart, len);
buffer[len] = 0;
return len;
}
void update_selection(struct editor *ed, int select) {
if (select) {
if (ed->anchor == -1) ed->anchor = ed->linepos + ed->col;
ed->refresh = 1;
} else {
if (ed->anchor != -1) ed->refresh = 1;
ed->anchor = -1;
}
}
int erase_selection(struct editor *ed) {
int selstart, selend;
if (!get_selection(ed, &selstart, &selend)) return 0;
moveto(ed, selstart, 0);
erase(ed, selstart, selend - selstart);
ed->anchor = -1;
ed->refresh = 1;
return 1;
}
void select_all(struct editor *ed) {
ed->anchor = 0;
ed->refresh = 1;
moveto(ed, text_length(ed), 0);
}
//
// Screen functions
//
void get_console_size(struct env *env) {
#ifdef __linux__
struct winsize ws;
ioctl(0, TIOCGWINSZ, &ws);
env->cols = ws.ws_col;
env->lines = ws.ws_row - 1;
#else
struct term *term = gettib()->proc->term;
env->cols = term->cols;
env->lines = term->lines - 1;
#endif
env->linebuf = realloc(env->linebuf, env->cols + LINEBUF_EXTRA);
}
void outch(char c) {
putchar(c);
}
void outbuf(unsigned char *buf, int len) {
fwrite(buf, 1, len, stdout);
}
void outstr(char *str) {
fputs(str, stdout);
}
void clear_screen() {
outstr(CLRSCR);
}
void gotoxy(int col, int line) {
char buf[32];
sprintf(buf, GOTOXY, line + 1, col + 1);
outstr(buf);
}
//
// Keyboard functions
//
void get_modifier_keys(int *shift, int *ctrl) {
*shift = *ctrl = 0;
#ifdef __linux__
if (linux_console) {
char modifiers = 6;
if (ioctl(0, TIOCLINUX, &modifiers) >= 0) {
if (modifiers & 1) *shift = 1;
if (modifiers & 4) *ctrl = 1;
}
}
#endif
}
int getkey() {
int ch, shift, ctrl;
ch = getchar();
if (ch < 0) return ch;
switch (ch) {
case 0x08: return KEY_BACKSPACE;
case 0x09:
get_modifier_keys(&shift, &ctrl);
if (shift) return KEY_SHIFT_TAB;
if (ctrl) return KEY_CTRL_TAB;
return KEY_TAB;
#ifdef SANOS
case 0x0D: return gettib()->proc->term->type == TERM_CONSOLE ? KEY_ENTER : KEY_UNKNOWN;
case 0x0A: return gettib()->proc->term->type != TERM_CONSOLE ? KEY_ENTER : KEY_UNKNOWN;
#else
case 0x0D: return KEY_ENTER;
case 0x0A: return KEY_ENTER;
#endif
case 0x1B:
ch = getchar();
switch (ch) {
case 0x1B: return KEY_ESC;
case 0x4F:
ch = getchar();
switch (ch) {
case 0x46: return KEY_END;
case 0x48: return KEY_HOME;
case 0x50: return KEY_F1;
case 0x52: return KEY_F3;
case 0x54: return KEY_F5;
default: return KEY_UNKNOWN;
}
break;
case 0x5B:
get_modifier_keys(&shift, &ctrl);
ch = getchar();
if (ch == 0x31) {
ch = getchar();
switch (ch) {
case 0x3B:
ch = getchar();
if (ch == 0x32) shift = 1;
if (ch == 0x35) ctrl = 1;
if (ch == 0x36) shift = ctrl = 1;
ch = getchar();
break;
case 0x35:
return getchar() == 0x7E ? KEY_F5 : KEY_UNKNOWN;
case 0x7E:
if (shift && ctrl) return KEY_SHIFT_CTRL_HOME;
if (shift) return KEY_SHIFT_HOME;
if (ctrl) return KEY_CTRL_HOME;
return KEY_HOME;
default:
return KEY_UNKNOWN;
}
}
switch (ch) {
case 0x31:
if (getchar() != 0x7E) return KEY_UNKNOWN;
if (shift && ctrl) return KEY_SHIFT_CTRL_HOME;
if (shift) return KEY_SHIFT_HOME;
if (ctrl) return KEY_CTRL_HOME;
return KEY_HOME;
case 0x32: return getchar() == 0x7E ? KEY_INS : KEY_UNKNOWN;
case 0x33: return getchar() == 0x7E ? KEY_DEL : KEY_UNKNOWN;
case 0x34:
if (getchar() != 0x7E) return KEY_UNKNOWN;
if (shift && ctrl) return KEY_SHIFT_CTRL_END;
if (shift) return KEY_SHIFT_END;
if (ctrl) return KEY_CTRL_END;
return KEY_END;
case 0x35:
if (getchar() != 0x7E) return KEY_UNKNOWN;
if (shift) return KEY_SHIFT_PGUP;
return KEY_PGUP;
case 0x36:
if (getchar() != 0x7E) return KEY_UNKNOWN;
if (shift) return KEY_SHIFT_PGDN;
return KEY_PGDN;
case 0x41:
if (shift && ctrl) return KEY_SHIFT_CTRL_UP;
if (shift) return KEY_SHIFT_UP;
if (ctrl) return KEY_CTRL_UP;
return KEY_UP;
case 0x42:
if (shift && ctrl) return KEY_SHIFT_CTRL_DOWN;
if (shift) return KEY_SHIFT_DOWN;
if (ctrl) return KEY_CTRL_DOWN;
return KEY_DOWN;
case 0x43:
if (shift && ctrl) return KEY_SHIFT_CTRL_RIGHT;
if (shift) return KEY_SHIFT_RIGHT;
if (ctrl) return KEY_CTRL_RIGHT;
return KEY_RIGHT;
case 0x44:
if (shift && ctrl) return KEY_SHIFT_CTRL_LEFT;
if (shift) return KEY_SHIFT_LEFT;
if (ctrl) return KEY_CTRL_LEFT;
return KEY_LEFT;
case 0x46:
if (shift && ctrl) return KEY_SHIFT_CTRL_END;
if (shift) return KEY_SHIFT_END;
if (ctrl) return KEY_CTRL_END;
return KEY_END;
case 0x48:
if (shift && ctrl) return KEY_SHIFT_CTRL_HOME;
if (shift) return KEY_SHIFT_HOME;
if (ctrl) return KEY_CTRL_HOME;
return KEY_HOME;
case 0x5A:
return KEY_SHIFT_TAB;
case 0x5B:
ch = getchar();
switch (ch) {
case 0x41: return KEY_F1;
case 0x43: return KEY_F3;
case 0x45: return KEY_F5;
}
return KEY_UNKNOWN;
default: return KEY_UNKNOWN;
}
break;
default: return KEY_UNKNOWN;
}
break;
case 0x00:
case 0xE0:
ch = getchar();
switch (ch) {
case 0x0F: return KEY_SHIFT_TAB;
case 0x3B: return KEY_F1;
case 0x3D: return KEY_F3;
case 0x3F: return KEY_F5;
case 0x47: return KEY_HOME;
case 0x48: return KEY_UP;
case 0x49: return KEY_PGUP;
case 0x4B: return KEY_LEFT;
case 0x4D: return KEY_RIGHT;
case 0x4F: return KEY_END;
case 0x50: return KEY_DOWN;
case 0x51: return KEY_PGDN;
case 0x52: return KEY_INS;
case 0x53: return KEY_DEL;
case 0x73: return KEY_CTRL_LEFT;
case 0x74: return KEY_CTRL_RIGHT;
case 0x75: return KEY_CTRL_END;
case 0x77: return KEY_CTRL_HOME;
case 0x8D: return KEY_CTRL_UP;
case 0x91: return KEY_CTRL_DOWN;
case 0x94: return KEY_CTRL_TAB;
case 0xB8: return KEY_SHIFT_UP;
case 0xB7: return KEY_SHIFT_HOME;
case 0xBF: return KEY_SHIFT_END;
case 0xB9: return KEY_SHIFT_PGUP;
case 0xBB: return KEY_SHIFT_LEFT;
case 0xBD: return KEY_SHIFT_RIGHT;
case 0xC0: return KEY_SHIFT_DOWN;
case 0xC1: return KEY_SHIFT_PGDN;
case 0xDB: return KEY_SHIFT_CTRL_LEFT;
case 0xDD: return KEY_SHIFT_CTRL_RIGHT;
case 0xD8: return KEY_SHIFT_CTRL_UP;
case 0xE0: return KEY_SHIFT_CTRL_DOWN;
case 0xD7: return KEY_SHIFT_CTRL_HOME;
case 0xDF: return KEY_SHIFT_CTRL_END;
default: return KEY_UNKNOWN;
}
break;
case 0x7F: return KEY_BACKSPACE;
default: return ch;
}
}
int prompt(struct editor *ed, char *msg, int selection) {
int maxlen, len, ch;
char *buf = ed->env->linebuf;
gotoxy(0, ed->env->lines);
outstr(STATUS_COLOR);
outstr(msg);
outstr(CLREOL);
len = 0;
maxlen = ed->env->cols - strlen(msg) - 1;
if (selection) {
len = get_selected_text(ed, buf, maxlen);
outbuf(buf, len);
}
for (;;) {
fflush(stdout);
ch = getkey();
if (ch == KEY_ESC) {
return 0;
} else if (ch == KEY_ENTER) {
buf[len] = 0;
return len > 0;
} else if (ch == KEY_BACKSPACE) {
if (len > 0) {
outstr("\b \b");
len--;
}
} else if (ch >= ' ' && ch < 0x100 && len < maxlen) {
outch(ch);
buf[len++] = ch;