| Current Path : /usr/src/contrib/dialog/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/contrib/dialog/tailbox.c |
/*
* $Id: tailbox.c,v 1.63 2011/06/27 08:19:43 tom Exp $
*
* tailbox.c -- implements the tail box
*
* Copyright 2000-2010,2011 Thomas E. Dickey
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License, version 2.1
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to
* Free Software Foundation, Inc.
* 51 Franklin St., Fifth Floor
* Boston, MA 02110, USA.
*
* An earlier version of this program lists as authors
* Pasquale De Marco (demarco_p@abramo.it)
*/
#include <dialog.h>
#include <dlg_keys.h>
#include <sys/stat.h>
typedef struct {
DIALOG_CALLBACK obj;
WINDOW *text;
const char **buttons;
int hscroll;
int old_hscroll;
char line[MAX_LEN + 1];
off_t last_pos;
} MY_OBJ;
/*
* Return current line of text.
*/
static char *
get_line(MY_OBJ * obj)
{
FILE *fp = obj->obj.input;
int col = -(obj->hscroll);
int j, tmpint, ch;
do {
if (((ch = getc(fp)) == EOF) && !feof(fp))
dlg_exiterr("Error moving file pointer in get_line().");
else if (!feof(fp) && (ch != '\n')) {
if ((ch == TAB) && (dialog_vars.tab_correct)) {
tmpint = dialog_state.tab_len
- ((col + obj->hscroll) % dialog_state.tab_len);
for (j = 0; j < tmpint; j++) {
if (col >= 0 && col < MAX_LEN)
obj->line[col] = ' ';
++col;
}
} else {
if (col >= 0)
obj->line[col] = (char) ch;
++col;
}
if (col >= MAX_LEN)
break;
}
} while (!feof(fp) && (ch != '\n'));
if (col < 0)
col = 0;
obj->line[col] = '\0';
return obj->line;
}
/*
* Print a new line of text.
*/
static void
print_line(MY_OBJ * obj, WINDOW *win, int row, int width)
{
int i, y, x;
char *line = get_line(obj);
(void) wmove(win, row, 0); /* move cursor to correct line */
(void) waddch(win, ' ');
#ifdef NCURSES_VERSION
(void) waddnstr(win, line, MIN((int) strlen(line), width - 2));
#else
line[MIN((int) strlen(line), width - 2)] = '\0';
waddstr(win, line);
#endif
getyx(win, y, x);
/* Clear 'residue' of previous line */
for (i = 0; i < width - x; i++)
(void) waddch(win, ' ');
}
/*
* Go back 'target' lines in text file. BUFSIZ has to be in 'size_t' range.
*/
static void
last_lines(MY_OBJ * obj, int target)
{
FILE *fp = obj->obj.input;
size_t inx;
int count = 0;
char buf[BUFSIZ + 1];
size_t size_to_read;
size_t size_as_read;
long offset = 0;
long fpos = 0;
if (fseek(fp, 0L, SEEK_END) == -1
|| (fpos = ftell(fp)) < 0)
dlg_exiterr("Error moving file pointer in last_lines().");
if (fpos != 0) {
++target;
for (;;) {
if (fpos >= BUFSIZ) {
size_to_read = BUFSIZ;
} else {
size_to_read = (size_t) fpos;
}
fpos = fpos - (long) size_to_read;
if (fseek(fp, fpos, SEEK_SET) == -1)
dlg_exiterr("Error moving file pointer in last_lines().");
size_as_read = fread(buf, sizeof(char), size_to_read, fp);
if (ferror(fp))
dlg_exiterr("Error reading file in last_lines().");
if (size_as_read == 0) {
fpos = 0;
offset = 0;
break;
}
offset += (long) size_as_read;
for (inx = size_as_read - 1; inx != 0; --inx) {
if (buf[inx] == '\n') {
if (++count > target)
break;
offset = (long) (inx + 1);
}
}
if (count > target) {
break;
} else if (fpos == 0) {
offset = 0;
break;
}
}
if (fseek(fp, fpos + offset, SEEK_SET) == -1)
dlg_exiterr("Error moving file pointer in last_lines().");
}
}
/*
* Print a new page of text.
*/
static void
print_page(MY_OBJ * obj, int height, int width)
{
int i;
for (i = 0; i < height; i++) {
print_line(obj, obj->text, i, width);
}
(void) wnoutrefresh(obj->text);
}
static void
print_last_page(MY_OBJ * obj)
{
int high = getmaxy(obj->obj.win) - (2 * MARGIN + (obj->obj.bg_task ? 1 : 3));
int wide = getmaxx(obj->text);
last_lines(obj, high);
print_page(obj, high, wide);
}
static void
repaint_text(MY_OBJ * obj)
{
FILE *fp = obj->obj.input;
int cur_y, cur_x;
getyx(obj->obj.win, cur_y, cur_x);
obj->old_hscroll = obj->hscroll;
print_last_page(obj);
obj->last_pos = ftell(fp);
(void) wmove(obj->obj.win, cur_y, cur_x); /* Restore cursor position */
wrefresh(obj->obj.win);
}
static bool
handle_input(DIALOG_CALLBACK * cb)
{
MY_OBJ *obj = (MY_OBJ *) cb;
FILE *fp = obj->obj.input;
struct stat sb;
if (fstat(fileno(fp), &sb) == 0
&& sb.st_size != obj->last_pos) {
repaint_text(obj);
}
return TRUE;
}
static bool
handle_my_getc(DIALOG_CALLBACK * cb, int ch, int fkey, int *result)
{
MY_OBJ *obj = (MY_OBJ *) cb;
bool done = FALSE;
if (!fkey && dlg_char_to_button(ch, obj->buttons) == 0) {
ch = DLGK_ENTER;
fkey = TRUE;
}
if (fkey) {
switch (ch) {
case DLGK_ENTER:
*result = DLG_EXIT_OK;
done = TRUE;
break;
case DLGK_BEGIN: /* Beginning of line */
obj->hscroll = 0;
break;
case DLGK_GRID_LEFT: /* Scroll left */
if (obj->hscroll > 0) {
obj->hscroll -= 1;
}
break;
case DLGK_GRID_RIGHT: /* Scroll right */
if (obj->hscroll < MAX_LEN)
obj->hscroll += 1;
break;
default:
beep();
break;
}
if ((obj->hscroll != obj->old_hscroll))
repaint_text(obj);
} else {
switch (ch) {
case ERR:
clearerr(cb->input);
ch = getc(cb->input);
(void) ungetc(ch, cb->input);
if (ch != EOF) {
handle_input(cb);
}
break;
case ESC:
done = TRUE;
*result = DLG_EXIT_ESC;
break;
default:
beep();
break;
}
}
return !done;
}
/*
* Display text from a file in a dialog box, like in a "tail -f".
*/
int
dialog_tailbox(const char *title, const char *file, int height, int width, int bg_task)
{
/* *INDENT-OFF* */
static DLG_KEYS_BINDING binding[] = {
HELPKEY_BINDINGS,
ENTERKEY_BINDINGS,
DLG_KEYS_DATA( DLGK_BEGIN, '0' ),
DLG_KEYS_DATA( DLGK_BEGIN, KEY_BEG ),
DLG_KEYS_DATA( DLGK_GRID_LEFT, 'H' ),
DLG_KEYS_DATA( DLGK_GRID_LEFT, 'h' ),
DLG_KEYS_DATA( DLGK_GRID_LEFT, KEY_LEFT ),
DLG_KEYS_DATA( DLGK_GRID_RIGHT, 'L' ),
DLG_KEYS_DATA( DLGK_GRID_RIGHT, 'l' ),
DLG_KEYS_DATA( DLGK_GRID_RIGHT, KEY_RIGHT ),
END_KEYS_BINDING
};
/* *INDENT-ON* */
#ifdef KEY_RESIZE
int old_height = height;
int old_width = width;
#endif
int fkey;
int x, y, result, thigh;
WINDOW *dialog, *text;
const char **buttons = 0;
MY_OBJ *obj;
FILE *fd;
int min_width = 12;
/* Open input file for reading */
if ((fd = fopen(file, "rb")) == NULL)
dlg_exiterr("Can't open input file in dialog_tailbox().");
#ifdef KEY_RESIZE
retry:
#endif
dlg_auto_sizefile(title, file, &height, &width, 2, min_width);
dlg_print_size(height, width);
dlg_ctl_size(height, width);
x = dlg_box_x_ordinate(width);
y = dlg_box_y_ordinate(height);
thigh = height - ((2 * MARGIN) + (bg_task ? 0 : 2));
dialog = dlg_new_window(height, width, y, x);
dlg_mouse_setbase(x, y);
/* Create window for text region, used for scrolling text */
text = dlg_sub_window(dialog,
thigh,
width - (2 * MARGIN),
y + MARGIN,
x + MARGIN);
dlg_draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
dlg_draw_bottom_box(dialog);
dlg_draw_title(dialog, title);
dlg_draw_helpline(dialog, FALSE);
if (!bg_task) {
buttons = dlg_exit_label();
dlg_button_layout(buttons, &min_width);
dlg_draw_buttons(dialog, height - (2 * MARGIN), 0, buttons, FALSE,
FALSE, width);
}
(void) wmove(dialog, thigh, (MARGIN + 1));
(void) wnoutrefresh(dialog);
obj = dlg_calloc(MY_OBJ, 1);
assert_ptr(obj, "dialog_tailbox");
obj->obj.input = fd;
obj->obj.win = dialog;
obj->obj.handle_getc = handle_my_getc;
obj->obj.handle_input = bg_task ? handle_input : 0;
obj->obj.keep_bg = bg_task && dialog_vars.cant_kill;
obj->obj.bg_task = bg_task;
obj->text = text;
obj->buttons = buttons;
dlg_add_callback(&(obj->obj));
dlg_register_window(dialog, "tailbox", binding);
dlg_register_buttons(dialog, "tailbox", buttons);
/* Print last page of text */
dlg_attr_clear(text, thigh, getmaxx(text), dialog_attr);
repaint_text(obj);
if (bg_task) {
result = DLG_EXIT_OK;
} else {
int ch;
do {
ch = dlg_getc(dialog, &fkey);
#ifdef KEY_RESIZE
if (fkey && ch == KEY_RESIZE) {
/* reset data */
height = old_height;
width = old_width;
/* repaint */
dlg_clear();
dlg_del_window(dialog);
refresh();
dlg_mouse_free_regions();
dlg_button_layout(buttons, &min_width);
goto retry;
}
#endif
}
while (handle_my_getc(&(obj->obj), ch, fkey, &result));
}
dlg_mouse_free_regions();
return result;
}