mc/src/view.c

/* {{{ Copyright notice */

/* View file module for the Midnight Commander
   Copyright (C) 1994, 1995, 1996 The Free Software Foundation
   Written by: 1994, 1995, 1998 Miguel de Icaza
               1994, 1995 Janne Kukonlehto
               1995 Jakub Jelinek
               1996 Joseph M. Hinkle
	       1997 Norbert Warmuth
	       1998 Pavel Machek

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

/* }}} */
/* {{{ Declarations */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#   include <unistd.h>
#endif
#include <string.h>
#include <sys/stat.h>
#ifdef HAVE_MMAP
#   include <sys/mman.h>
#endif
#include <ctype.h>	/* For toupper() */
#include <errno.h>
#include <limits.h>

#include "global.h"
#include "tty.h"
#include "cmd.h"		/* For view_other_cmd */
#include "dlg.h"		/* Needed by widget.h */
#include "widget.h"		/* Needed for buttonbar_new */
#include "color.h"
#include "dialog.h"
#include "mouse.h"
#include "help.h"
#include "key.h"		/* For mi_getch() */
#include "layout.h"
#include "setup.h"
#include "wtools.h"		/* For query_set_sel() */
#include "../vfs/vfs.h"
#include "dir.h"
#include "panel.h" /* Needed for current_panel and other_panel */
#include "win.h"
#include "main.h"		/* For the externs */
#define WANT_WIDGETS
#include "view.h"

#ifdef HAVE_CHARSET
#include "charsets.h"
#include "selcodepage.h"
#endif /* HAVE_CHARSET */

#ifndef MAP_FILE
#define MAP_FILE 0
#endif

/* Block size for reading files in parts */
#define READ_BLOCK 8192
#define VIEW_PAGE_SIZE 8192

#ifdef IS_AIX
#   define IFAIX(x) case (x):
#else
#   define IFAIX(x)
#endif

/* Maxlimit for skipping updates */
static int max_dirt_limit = 
#ifdef NATIVE_WIN32
0;
#else
10;
#endif

extern Hook *idle_hook;

/* If set, show a ruler */
static int ruler = 0;

/* Scrolling is done in pages or line increments */
int mouse_move_pages_viewer = 1;

/* Used to compute the bottom first variable */
int have_fast_cpu = 0;

/* wrap mode default */
int global_wrap_mode = 1;

int default_hex_mode = 0;
static int default_hexedit_mode = 0;
int default_magic_flag = 1;
int default_nroff_flag = 1;
int altered_hex_mode = 0;
int altered_magic_flag = 0;
int altered_nroff_flag = 0;
/* }}} */

static const char hex_char[] = "0123456789ABCDEF";

/* Our callback */
static int view_callback (Dlg_head *h, WView *view, int msg, int par);

static int regexp_view_search (WView *view, char *pattern, char *string, int match_type);
static void view_move_forward  (WView *view, int i);
static void view_labels (WView *view);
static void set_monitor (WView *view, int set_on);
static void view_update (WView *view, gboolean update_gui);

/* }}} */
/* {{{ Clean-up functions */

static void
close_view_file (WView *view)
{
    if (view->file != -1){
	mc_close (view->file);
	view->file = -1;
    }
}

static void
free_file (WView *view)
{
    int i;
    
#ifdef HAVE_MMAP
    if (view->mmapping){
	mc_munmap (view->data, view->s.st_size);
	close_view_file (view);
    } else 
#endif /* HAVE_MMAP */
    {
	if (view->reading_pipe){
	    /* Check error messages */
	    if (!view->have_frame)
		check_error_pipe ();
	    
	    /* Close pipe */
	    pclose (view->stdfile);
	    view->stdfile = NULL;
	    
	    /* Ignore errors because we don't want to hear about broken pipe */
	    close_error_pipe (-1, NULL);
	} else
	    close_view_file (view);
    }
    /* Block_ptr may be zero if the file was a file with 0 bytes */
    if (view->growing_buffer && view->block_ptr){
	for (i = 0; i < view->blocks; i++){
	    g_free (view->block_ptr [i].data);
	}
	g_free (view->block_ptr);
    }
}

/* Valid parameters for second parameter to set_monitor */
enum { off, on };

/* Both views */
static void
view_done (WView *view)
{
    set_monitor (view, off);

    /* alex: release core, used to replace mmap */
    if (!view->mmapping && !view->growing_buffer && view->data != NULL){
        g_free (view->data);
	view->data = NULL;
    }

    if (view->view_active){
	if (view->localcopy)
	    mc_ungetlocalcopy (view->filename, view->localcopy, 0);
	free_file (view);
	g_free (view->filename);
	if (view->command)
	    g_free (view->command);
    }
    view->view_active = 0;
    default_hex_mode = view->hex_mode;
    default_nroff_flag = view->viewer_nroff_flag;
    default_magic_flag = view->viewer_magic_flag;
    global_wrap_mode   = view->wrap_mode;
}

static void view_hook (void *);

static void
view_destroy (WView *view)
{
    view_done (view);
    if (view->have_frame)
	delete_hook (&select_file_hook, view_hook);
}

static int
get_byte (WView *view, unsigned int byte_index)
{
    int page   = byte_index / VIEW_PAGE_SIZE + 1;
    int offset = byte_index % VIEW_PAGE_SIZE;
    int i, n;

    if (view->growing_buffer){
	if (page > view->blocks){
	    view->block_ptr = g_realloc (view->block_ptr,
					 sizeof (block_ptr_t) * page);
	    for (i = view->blocks; i < page; i++){
		char *p = g_malloc (VIEW_PAGE_SIZE);
		view->block_ptr [i].data = p;
		if (!p)
		    return '\n';
		if (view->stdfile != NULL)
		    n = fread (p, 1, VIEW_PAGE_SIZE, view->stdfile);
		else
		    n = mc_read (view->file, p, VIEW_PAGE_SIZE);
/*
 * FIXME: Errors are ignored at this point
 * Also should report preliminary EOF
 */
		if (n != -1)
		    view->bytes_read += n;
		if (view->s.st_size < view->bytes_read){
		    view->bottom_first = -1; /* Invalidate cache */
		    view->s.st_size = view->bytes_read;
		    view->last_byte = view->bytes_read;
		    if (view->reading_pipe)
			view->last_byte = view->first + view->bytes_read;
		}
		/* To force loading the next page */
		if (n == VIEW_PAGE_SIZE && view->reading_pipe){
		    view->last_byte++;
		}
	    }
	    view->blocks = page;
	}
	if (byte_index > view->bytes_read){
	    return -1;
	} else
	    return view->block_ptr [page-1].data [offset];
    } else {
    	if (byte_index >= view->last_byte)
    	    return -1;
    	else
	    return view->data [byte_index];
    }
}

static void
enqueue_change (struct hexedit_change_node **head, struct hexedit_change_node *node)
{
    struct hexedit_change_node *curr = *head;

    while (curr) {
        if (node->offset < curr->offset) {
            *head = node;
            node->next = curr;
            return;
        }
        head = (struct hexedit_change_node **) curr;
        curr = curr->next;
    }
    *head = node;
    node->next = curr;
}

static void move_right (WView *);

static void
put_editkey (WView *view, unsigned char key)
{
    struct hexedit_change_node *node;
    unsigned char byte_val;

    if (!view->hexedit_mode || view->growing_buffer != 0)
        return;
 
    /* Has there been a change at this position ? */
    node = view->change_list;
    while (node && (node->offset != view->edit_cursor)) { 
 	node = node->next;
    }

    if (view->view_side == view_side_left) {
        /* Hex editing */

        if (key >= '0' && key <= '9')
            key -= '0';
        else if (key >= 'A' && key <= 'F')
            key -= '7';
        else if (key >= 'a' && key <= 'f')
            key -= 'W';
        else
            return;

        if (node)
            byte_val = node->value;
        else
            byte_val = get_byte(view, view->edit_cursor);

        if (view->nib_shift == 0) {
            byte_val = (byte_val & 0x0f) | (key << 4);
        } else {
            byte_val = (byte_val & 0xf0) | (key);
        }
    } else {
        /* Text editing */
        byte_val = key;
    }
    if (!node) {
        node = (struct hexedit_change_node *)
                    g_new (struct hexedit_change_node, 1);

        if (node) {
#ifndef HAVE_MMAP
	  /* alex@bcs.zaporizhzhe.ua: here we are using file copy
	   * completely loaded into memory, so we can replace bytes in
	   * view->data array to allow changes to be reflected when
	   * user switches back to ascii mode */
	    view->data[view->edit_cursor] = byte_val;
#endif /* !HAVE_MMAP */
            node->offset = view->edit_cursor;
            node->value = byte_val;
            enqueue_change (&view->change_list, node);
        }
    } else {
        node->value = byte_val;
    }
    view->dirty++;
    view_update (view, TRUE);
    move_right (view);
}

static void
free_change_list (WView *view)
{
    struct hexedit_change_node *n = view->change_list;

    while (n) {
        view->change_list = n->next;
        g_free (n);
        n = view->change_list;
    }
    view->file_dirty = 0;
    view->dirty++;
}

static void
save_edit_changes (WView *view)
{
    struct hexedit_change_node *node = view->change_list;
    int fp;

    do {
	fp = open (view->filename, O_WRONLY);
	if (fp >= 0) {
	    while (node) {
		if (lseek (fp, node->offset, SEEK_SET) == -1 ||
		    write (fp, &node->value, 1) != 1) {
		    close (fp);
		    fp = -1;
		    break;
		}
		node = node->next;
	    }
	    close (fp);
	}

	if (fp == -1) {
	    fp = query_dialog (_(" Save file "),
			       _(" Error trying to save file. "), 
			       2, 2, _("&Retry"), _("&Cancel"));
	    if (fp == 0)
		fp = -1;
	}
    } while (fp == -1);

    free_change_list (view);
}

static int
view_ok_to_quit (WView *view)
{
    int r;

    if (!view->change_list)
	return 1;

    r = query_dialog (_(" Quit "),
		      _(" File was modified, Save with exit? "), 2, 3,
		      _("Cancel quit"), _("&Yes"), _("&No"));

    switch (r) {
    case 1:
	save_edit_changes (view);
	return 1;
    case 2:
	free_change_list (view);
	return 1;
    default:
	return 0;
    }
}

static char *
set_view_init_error (WView *view, char *msg)
{
    view->growing_buffer = 0;
    view->reading_pipe   = 0;
    view->first = 0;
    view->last_byte = 0;
    if (msg){
	view->bytes_read = strlen (msg);
	return g_strdup (msg);
    }
    return 0;
}

/* return values: NULL for success, else points to error message */
static char *
init_growing_view (WView * view, char *name, char *filename)
{
    char *err_msg = NULL;

    view->growing_buffer = 1;

    if (name) {
	view->reading_pipe = 1;
	view->s.st_size = 0;

	open_error_pipe ();
	if ((view->stdfile = popen (name, "r")) == NULL) {
	    /* Avoid two messages.  Message from stderr has priority.  */
	    if (!close_error_pipe (view->have_frame ? -1 : 1, view->data))
		err_msg = _(" Cannot spawn child program ");
	    return set_view_init_error (view, err_msg);
	}

	/* First, check if filter produced any output */
	get_byte (view, 0);
	if (view->bytes_read <= 0) {
	    pclose (view->stdfile);
	    view->stdfile = NULL;
	    /* Avoid two messages.  Message from stderr has priority.  */
	    if (!close_error_pipe (view->have_frame ? -1 : 1, view->data))
		err_msg = (" Empty output from child filter ");
	    return set_view_init_error (view, err_msg);
	}
    } else {
	view->stdfile = NULL;
	if ((view->file = mc_open (filename, O_RDONLY)) == -1)
	    return set_view_init_error (view, _(" Could not open file "));
    }
    return NULL;
}

/* Load filename into core */
/* returns:
   -1 on failure.
   if (have_frame), we return success, but data points to a
   error message instead of the file buffer (quick_view feature).
*/
static char *load_view_file (WView *view, int fd)
{
    view->file = fd;

    if (view->s.st_size == 0){
	/* Must be one of those nice files that grow (/proc) */
	close_view_file (view);
	return init_growing_view (view, 0, view->filename);
    }

#ifdef HAVE_MMAP
    view->data = mc_mmap (0, view->s.st_size, PROT_READ, MAP_FILE | MAP_SHARED,
		          view->file, 0);
    if ((caddr_t) view->data != (caddr_t) -1) {
	/* mmap worked */
	view->first = 0;
	view->bytes_read = view->s.st_size;
	view->mmapping = 1;
	return NULL;
    }
#endif /* HAVE_MMAP */

    /* For those OS that dont provide mmap call. Try to load all the
     * file into memory (alex@bcs.zaporizhzhe.ua). Also, mmap can fail
     * for any reason, so we use this as fallback (pavel@ucw.cz) */

    view->data = (unsigned char*) g_malloc (view->s.st_size);
    if (view->data == NULL
	|| mc_lseek(view->file, 0, SEEK_SET) != 0
	|| mc_read(view->file, view->data, view->s.st_size) != view->s.st_size){
        if (view->data != NULL)
	    g_free (view->data);
	close_view_file (view);
	return init_growing_view (view, 0, view->filename);
    }
    view->first = 0;
    view->bytes_read = view->s.st_size;
    return NULL;
}

/* Return zero on success, -1 on failure */
static int
do_view_init (WView *view, char *_command, const char *_file, int start_line)
{
    char *error = 0;
    int i, type;
    int fd = -1;
    char tmp[BUF_MEDIUM];

    if (view->view_active)
	view_done (view);

    /* Set up the state */
    view->block_ptr = 0;
    view->data = NULL;
    view->growing_buffer = 0;
    view->reading_pipe = 0;
    view->mmapping = 0;
    view->blocks = 0;
    view->block_ptr = 0;
    view->first = view->bytes_read = 0;
    view->last_byte = 0;
    view->filename = g_strdup (_file);
    view->localcopy = 0;
    view->command = 0;
    view->last = view->first + ((LINES-2) * view->bytes_per_line);

    /* Clear the markers */
    view->marker = 0;
    for (i = 0; i < 10; i++)
	view->marks [i] = 0;
    
    if (!view->have_frame){
	view->start_col = 0;
    }

    if (_command && (view->viewer_magic_flag || _file[0] == '\0')) {
	error = init_growing_view (view, _command, view->filename);
    } else if (_file[0]) {
	/* Make sure we are working with a regular file */
	if (mc_stat (view->filename, &view->s) == -1) {
	    g_snprintf (tmp, sizeof (tmp), _(" Cannot stat \"%s\"\n %s "),
			_file, unix_error_string (errno));
	    error = set_view_init_error (view, tmp);
	    goto finish;
	}

	if (!S_ISREG (view->s.st_mode)) {
	    g_snprintf (tmp, sizeof (tmp),
			_(" Cannot view: not a regular file "));
	    error = set_view_init_error (view, tmp);
	    goto finish;
	}

	/* Actually open the file */
	if ((fd = mc_open(_file, O_RDONLY)) == -1) {
	    g_snprintf (tmp, sizeof (tmp), _(" Cannot open \"%s\"\n %s "),
			_file, unix_error_string (errno));
	    error = set_view_init_error (view, tmp);
	    goto finish;
	}

	type = get_compression_type (fd);

	if (view->viewer_magic_flag && (type != COMPRESSION_NONE)) {
	    g_free (view->filename);
	    view->filename = g_strconcat (_file, decompress_extension(type), NULL);
	}

	error = load_view_file (view, fd);
    }

finish:
    if (error){
	if (!view->have_frame){
	    message (1, MSG_ERROR, "%s", error);
	    g_free (error);
	    return -1;
	}
    }

    view->view_active = 1;
    if (_command)
    	view->command = g_strdup (_command);
    else
    	view->command = 0;
    view->search_start = view->start_display = view->start_save = view->first;
    view->found_len = 0;
    view->start_col = 0;
    view->last_search = 0;            /* Start a new search */

    /* Special case: The data points to the error message */
    if (error){
	view->data = error;
        view->file = -1;
	view->s.st_size = view->bytes_read = strlen (view->data);
    }
    view->last_byte = view->first + view->s.st_size;
    
    if (start_line > 1 && !error){
        int saved_wrap_mode = view->wrap_mode;

        view->wrap_mode = 0;
	get_byte (view, 0);
	view_move_forward (view, start_line - 1);
        view->wrap_mode = saved_wrap_mode;
    }
    view->edit_cursor = view->first;
    view->file_dirty =  0;
    view->nib_shift = 0;
    view->view_side = view_side_left;
    view->change_list = NULL;

    return 0;
}

void
view_update_bytes_per_line (WView *view)
{
    int cols;

    if (view->have_frame)
	cols = view->widget.cols - 2;
    else
	cols = view->widget.cols;

    view->bottom_first = -1;
    if (cols < 80)
	view->bytes_per_line = ((cols - 8) / 17) * 4;
    else
	view->bytes_per_line = ((cols - 8) / 18) * 4;

    if (view->bytes_per_line == 0)
	view->bytes_per_line++;	/* To avoid division by 0 */

    view->dirty = max_dirt_limit + 1;	/* To force refresh */
}

/* Both views */
/* Return zero on success, -1 on failure */
int
view_init (WView *view, char *_command, const char *_file, int start_line)
{
    if (!view->view_active || strcmp (_file, view->filename) || altered_magic_flag)
	return do_view_init (view, _command, _file, start_line);
    else
	return 0;
}

/* }}} */

/* {{{ Screen update functions */

static void
view_percent (WView *view, int p, int w, gboolean update_gui)
{
    int percent;

    percent = (view->s.st_size == 0 || view->last_byte == view->last) ? 100 :
        (p > (INT_MAX/100) ?
         p / (view->s.st_size / 100) :
	 p * 100 / view->s.st_size);

#if 0
    percent = view->s.st_size == 0 ? 100 :
	(view->last_byte == view->last ? 100 :
	 (p)*100 / view->s.st_size);
#endif
    
    widget_move (view, view->have_frame, w - 5);
    printw ("%3d%%", percent);
}

static void
view_status (WView *view, gboolean update_gui)
{
    static int i18n_adjust=0;
    static char *file_label;

    int w = view->widget.cols - (view->have_frame * 2);
    int i;

    attrset (SELECTED_COLOR);
    widget_move (view, view->have_frame, view->have_frame);
    hline (' ', w);

    if (!i18n_adjust) {
       file_label = _("File: %s");
       i18n_adjust = strlen(file_label) - 2;
    }

    if (w < i18n_adjust + 6)
	addstr (name_trunc (view->filename ? view->filename:
			    view->command ? view->command:"", w));
    else{
    	i = (w > 22 ? 22 : w ) - i18n_adjust ;
    	printw (file_label, name_trunc (view->filename ? view->filename:
					view->command ? view->command:"", i));
    	if (w > 46){
    	    widget_move (view, view->have_frame, 24 + view->have_frame );
            if (view->hex_mode)
                printw (_("Offset 0x%08x"), view->edit_cursor);
            else
		printw (_("Col %d"), -view->start_col);
    	}
    	if (w > 62){
	    widget_move (view, view->have_frame, 43 + view->have_frame);
	    printw (_("%s bytes"), size_trunc (view->s.st_size));
        }
	if (w > 70){
	    printw (" ");
	    if (view->growing_buffer)
		addstr (_("  [grow]"));
	}
        if (w > 26) {
            view_percent (view,
			  view->hex_mode ? view->edit_cursor : view->start_display,
			  view->widget.cols - view->have_frame + 1,
			  update_gui);
	}
    }
    attrset (SELECTED_COLOR);
}

static inline void
view_display_clean (WView *view, int height, int width)
{
    /* FIXME: Should I use widget_erase only and repaint the box? */
    if (view->have_frame){
	int i;
	
	draw_double_box (view->widget.parent, view->widget.y, view->widget.x,
		         view->widget.lines, view->widget.cols);
	for (i = 1; i < height; i++){
	    widget_move (view, i, 1);
	    printw ("%*s", width-1, "");
	}
    } else
	widget_erase ((Widget *) view);
}

#define view_add_character(view,c) addch (c)
#define view_add_one_vline()       one_vline()
#define view_add_string(view,s)    addstr (s)
#define view_gotoyx(v,r,c)    widget_move (v,r,c)

#define view_freeze(view)
#define view_thaw(view)

#define STATUS_LINES 1

typedef enum {
    MARK_NORMAL = 0,
    MARK_SELECTED = 1,
    MARK_CURSOR = 2,
    MARK_CHANGED = 3
} mark_t;

/* Shows the file pointed to by *start_display on view_win */
static long
display (WView *view)
{
    const int frame_shift = view->have_frame;
    int col = 0 + frame_shift;
    int row = STATUS_LINES + frame_shift;
    int height, width;
    unsigned long from;
    int c;
    mark_t boldflag = MARK_NORMAL;
    struct hexedit_change_node *curr = view->change_list;

    height = view->widget.lines - frame_shift;
    width = view->widget.cols - frame_shift;
    from = view->start_display;
    attrset (NORMAL_COLOR);

    view_freeze (view);
    view_display_clean (view, height, width);

    /* Optionally, display a ruler */
    if ((!view->hex_mode) && (ruler)) {
	char r_buff[10];
	int cl;

	attrset (MARKED_COLOR);
	for (c = frame_shift; c < width; c++) {
	    cl = c - view->start_col;
	    if (ruler == 1)
		view_gotoyx (view, row, c);
	    else
		view_gotoyx (view, row + height - 2, c);
	    r_buff[0] = '-';
	    if ((cl % 10) == 0)
		r_buff[0] = '|';
	    else if ((cl % 5) == 0)
		r_buff[0] = '*';
	    view_add_character (view, r_buff[0]);
	    if ((cl != 0) && (cl % 10) == 0) {
		g_snprintf (r_buff, sizeof (r_buff), "%03d", cl);
		if (ruler == 1) {
		    widget_move (view, row + 1, c - 1);
		} else {
		    widget_move (view, row + height - 3, c - 1);
		}
		view_add_string (view, r_buff);
	    }
	}
	attrset (NORMAL_COLOR);
	if (ruler == 1)
	    row += 2;
	else
	    height -= 2;
    }

    /* Find the first displayable changed byte */
    while (curr && (curr->offset < from)) {
	curr = curr->next;
    }
    if (view->hex_mode) {
	char hex_buff[10];	/* A temporary buffer for sprintf and mvwaddstr */
	int bytes;		/* Number of bytes already printed on the line */

	/* Start of text column */
	int text_start = width - view->bytes_per_line - 1 + frame_shift;

	for (; row < height && from < view->last_byte; row++) {
	    /* Print the hex offset */
	    attrset (MARKED_COLOR);
	    g_snprintf (hex_buff, sizeof (hex_buff), "%08X",
			(int) (from - view->first));
	    view_gotoyx (view, row, frame_shift);
	    view_add_string (view, hex_buff);
	    attrset (NORMAL_COLOR);

	    /* Hex dump starts from column nine */
	    if (view->have_frame)
		col = 10;
	    else
		col = 9;

	    /* Each hex number is two digits */
	    hex_buff[2] = 0;
	    for (bytes = 0;
		 bytes < view->bytes_per_line && from < view->last_byte;
		 bytes++, from++) {
		/* Display and mark changed bytes */
		if (curr && from == curr->offset) {
		    c = curr->value;
		    curr = curr->next;
		    boldflag = MARK_CHANGED;
		    attrset (VIEW_UNDERLINED_COLOR);
		} else
		    c = (unsigned char) get_byte (view, from);

		if (view->found_len && from >= view->search_start
		    && from < view->search_start + view->found_len) {
		    boldflag = MARK_SELECTED;
		    attrset (MARKED_COLOR);
		}
		/* Display the navigation cursor */
		if (from == view->edit_cursor) {
		    if (view->view_side == view_side_left) {
			view->cursor_row = row;
			view->cursor_col = col;
		    }
		    boldflag = MARK_CURSOR;
		    attrset (view->view_side ==
			     view_side_left ? VIEW_UNDERLINED_COLOR :
			     MARKED_SELECTED_COLOR);
		}

		/* Print a hex number (sprintf is too slow) */
		hex_buff[0] = hex_char[(c >> 4)];
		hex_buff[1] = hex_char[c & 15];
		view_gotoyx (view, row, col);
		view_add_string (view, hex_buff);
		col += 3;
		/* Turn off the cursor or changed byte highlighting here */
		if (boldflag == MARK_CURSOR || boldflag == MARK_CHANGED)
		    attrset (NORMAL_COLOR);
		if ((bytes & 3) == 3 && bytes + 1 < view->bytes_per_line) {
		    /* Turn off the search highlighting */
		    if (boldflag == MARK_SELECTED
			&& from ==
			view->search_start + view->found_len - 1)
			attrset (NORMAL_COLOR);

		    /* Hex numbers are printed in the groups of four */
		    /* Groups are separated by a vline */

		    view_gotoyx (view, row, col - 1);
		    view_add_character (view, ' ');
		    view_gotoyx (view, row, col);
		    if ((view->have_frame && view->widget.cols < 82) ||
			view->widget.cols < 80)
			col += 1;
		    else {
			view_add_one_vline ();
			col += 2;
		    }

		    if (boldflag != MARK_NORMAL
			&& from ==
			view->search_start + view->found_len - 1)
			attrset (MARKED_COLOR);

		}
		if (boldflag != MARK_NORMAL
		    && from < view->search_start + view->found_len - 1
		    && bytes != view->bytes_per_line - 1) {
		    view_gotoyx (view, row, col);
		    view_add_character (view, ' ');
		}

		/* Print the corresponding ascii character */
		view_gotoyx (view, row, text_start + bytes);

#ifdef HAVE_CHARSET
		c = conv_displ[c];
#endif

		if (!is_printable (c))
		    c = '.';
		switch (boldflag) {
		case MARK_NORMAL:
		    break;
		case MARK_SELECTED:
		    attrset (MARKED_COLOR);
		    break;
		case MARK_CURSOR:
		    if (view->view_side == view_side_right) {
			/* Our side is active */
			view->cursor_col = text_start + bytes;
			view->cursor_row = row;
			attrset (VIEW_UNDERLINED_COLOR);
		    } else {
			/* Other side is active */
			attrset (MARKED_SELECTED_COLOR);
		    }
		    break;
		case MARK_CHANGED:
		    attrset (VIEW_UNDERLINED_COLOR);
		    break;
		}
		view_add_character (view, c);

		if (boldflag != MARK_NORMAL) {
		    boldflag = MARK_NORMAL;
		    attrset (NORMAL_COLOR);
		}
	    }
	}
    } else {
	if (view->growing_buffer && from == view->last_byte)
	    get_byte (view, from);
	for (; row < height && from < view->last_byte; from++) {
	    c = get_byte (view, from);
	    if ((c == '\n') || (col >= width && view->wrap_mode)) {
		col = frame_shift;
		row++;
		if (c == '\n' || row >= height)
		    continue;
	    }
	    if (c == '\r')
		continue;
	    if (c == '\t') {
		col = ((col - frame_shift) / 8) * 8 + 8 + frame_shift;
		continue;
	    }
	    if (view->viewer_nroff_flag && c == '\b') {
		int c_prev;
		int c_next;

		if (from + 1 < view->last_byte
		    && is_printable ((c_next = get_byte (view, from + 1)))
		    && from > view->first
		    && is_printable ((c_prev = get_byte (view, from - 1)))
		    && (c_prev == c_next || c_prev == '_')) {
		    if (col <= frame_shift) {
			/* So it has to be wrap_mode - do not need to check for it */
			if (row == 1 + frame_shift) {
			    from++;
			    continue;	/* There had to be a bold character on the rightmost position
					   of the previous undisplayed line */
			}
			row--;
			col = width;
		    }
		    col--;
		    boldflag = MARK_SELECTED;
		    if (c_prev == '_' && c_next != '_')
			attrset (VIEW_UNDERLINED_COLOR);
		    else
			attrset (MARKED_COLOR);
		    continue;
		}
	    }
	    if (view->found_len && from >= view->search_start
		&& from < view->search_start + view->found_len) {
		boldflag = MARK_SELECTED;
		attrset (SELECTED_COLOR);
	    }
	    if (col >= frame_shift - view->start_col
		&& col < width - view->start_col) {
		view_gotoyx (view, row, col + view->start_col);

#ifdef HAVE_CHARSET
		c = conv_displ[c];
#endif

		if (!is_printable (c))
		    c = '.';

		view_add_character (view, c);
	    }
	    col++;
	    if (boldflag != MARK_NORMAL) {
		boldflag = MARK_NORMAL;
		attrset (NORMAL_COLOR);
	    }

	    /* Very last thing */
	    if (view->growing_buffer && from + 1 == view->last_byte)
		get_byte (view, from + 1);
	}
    }
    view->last = from;
    view_thaw (view);
    return from;
}

static void
view_place_cursor (WView *view)
{
    int shift;

    if (view->view_side == view_side_left)
	shift = view->nib_shift;
    else
	shift = 0;
    
    widget_move (&view->widget, view->cursor_row, view->cursor_col + shift);
}

static void
view_update (WView *view, gboolean update_gui)
{
    static int dirt_limit = 1;

    if (view->dirty > dirt_limit){
	/* Too many updates skipped -> force a update */
	display (view);
	view_status (view, update_gui);
	view->dirty = 0;
	/* Raise the update skipping limit */
	dirt_limit++;
	if (dirt_limit > max_dirt_limit)
	    dirt_limit = max_dirt_limit;
    }
    if (view->dirty){
	if (is_idle ()){
	    /* We have time to update the screen properly */
	    display (view);
	    view_status (view, update_gui);
	    view->dirty = 0;
	    if (dirt_limit > 1)
		dirt_limit--;
	} else {
	    /* We are busy -> skipping full update,
	       only the status line is updated */
	    view_status (view, update_gui);
	}
	/* Here we had a refresh, if fast scrolling does not work
	   restore the refresh, although this should not happen */
    }
}

static inline void
my_define (Dlg_head *h, int idx, char *text,
			 void (*fn)(WView *), WView *view)
{
    define_label_data (h, (Widget *) view, idx, text, (buttonbarfn) fn, view);
}

/* }}} */
/* {{{ Movement functions */
/* If the last parameter is nonzero, it means we want get the count of lines
   from current up to the the upto position inclusive */
static long
move_forward2 (WView *view, long current, int lines, long upto)
{
    unsigned long q, p;
    int  line;
    int  col = 0;

    if (view->hex_mode){
        p = current + lines * view->bytes_per_line;
        p = (p >= view->last_byte) ? current : p;
        if (lines == 1) {
            q = view->edit_cursor + view->bytes_per_line;
            line = q / view->bytes_per_line;
            col = (view->last_byte-1) / view->bytes_per_line;
            view->edit_cursor = (line > col) ? view->edit_cursor : q;
            view->edit_cursor = (view->edit_cursor < view->last_byte) ?
                view->edit_cursor : view->last_byte-1;
            q = current + ((LINES-2) * view->bytes_per_line);
            p = (view->edit_cursor < q) ? current : p;
        } else {
            view->edit_cursor = (view->edit_cursor < p) ?
                p : view->edit_cursor;
        }
        return p;
    } else {
    	if (upto){
    	    lines = -1;
    	    q = upto;
    	} else
    	    q = view->last_byte;
        if (get_byte (view, q) != '\n')
	    q++;
        for (line = col = 0, p = current; p < q; p++){
	    int c;
	    
	    if (lines != -1 && line >= lines)
	        return p;

	    c = get_byte (view, p);
	    
	    if (view->wrap_mode){
	    	if (c == '\r')
	    	    continue; /* This characters is never displayed */
	    	else if (c == '\t')
	    	    col = ((col - view->have_frame)/8)*8 +8+ view->have_frame;
		else
		    col++;
	    	if (view->viewer_nroff_flag && c == '\b'){
	    	    if (p + 1 < view->last_byte
			&& is_printable (get_byte (view, p + 1))
	    	        && p > view->first
			&& is_printable (get_byte (view, p - 1)))
		        col -= 2;
	        } else if (col == vwidth){
		    /* FIXME: the c in is_printable was a p, that is a bug,
		       I suspect I got that fix from Jakub, same applies
		       for d. */
		    int d = get_byte (view, p+2);
		    
		    if (p + 2 >= view->last_byte || !is_printable (c) || 
		        !view->viewer_nroff_flag || get_byte (view, p + 1) != '\b' || 
		        !is_printable (d)){
		        col = 0;
			
		        if (c == '\n' || get_byte (view, p+1) != '\n')
		            line++;
		    }
		} else if (c == '\n'){
	            line++;
		    col = 0;
	        }
	    } else if (c == '\n')
	        line++;
        }
        if (upto)
            return line;
    }
    return current;
}

/* returns the new current pointer */
/* Cause even the forward routine became very complex, we in the wrap_mode
   just find the nearest '\n', use move_forward2(p, 0, q) to get the count
   of lines up to there and then use move_forward2(p, something, 0), which we
   return */
static long
move_backward2 (WView *view, unsigned long current, int lines)
{
    long p, q, pm;
    int line;

    if (!view->hex_mode && current == view->first)
        return current;
    
    if (view->hex_mode){
	p = current - lines * view->bytes_per_line;
        p = (p < view->first) ? view->first : p;
        if (lines == 1) {
            q = view->edit_cursor - view->bytes_per_line;
            view->edit_cursor = (q < view->first) ? view->edit_cursor : q;
            p = (view->edit_cursor >= current) ? current : p;
        } else {
            q = p + ((LINES-2) * view->bytes_per_line);
            view->edit_cursor = (view->edit_cursor >= q) ?
                p : view->edit_cursor;
        }
        return p;
    } else {
    	if (current == view->last_byte
	    && get_byte (view, current - 1) != '\n')
	    /* There is one virtual '\n' at the end,
	       so that the last line is shown */
  	    line = 1;
  	else
  	    line = 0;
        for (q = p = current - 1; p >= view->first; p--)
	    if (get_byte (view, p) == '\n' || p == view->first) {
	        pm = p > view->first ? p + 1 : view->first;
	    	if (!view->wrap_mode){
	            if (line == lines)
	            	return pm;
	            line++;
	        } else {
	            line += move_forward2 (view, pm, 0, q);
	            if (line >= lines){
	            	if (line == lines)
	            	    return pm;
	            	else
	            	    return move_forward2 (view, pm, line - lines, 0);
	            }
	            q = p + 1;
	        }
            }
    }
    return p > view->first ? p : view->first;
}

static void
view_move_backward (WView *view, int i)
{
    view->search_start = view->start_display =
	move_backward2 (view, view->start_display, i);
    view->found_len = 0;
    view->last = view->first + ((LINES-2) * view->bytes_per_line);
    view->dirty++;
}

static long
get_bottom_first (WView *view, int do_not_cache, int really)
{
    int bottom_first;

    if (!have_fast_cpu && !really)
	return INT_MAX;
    
    if (!do_not_cache && view->bottom_first != -1)
    	return view->bottom_first;

    /* Force loading */
    if (view->growing_buffer){
	int old_last_byte;

	old_last_byte = -1;
	while (old_last_byte != view->last_byte){
	    old_last_byte = view->last_byte;
	    get_byte (view, view->last_byte+VIEW_PAGE_SIZE);
	}
    }

    bottom_first = move_backward2 (view, view->last_byte, vheight - 1);
    
    if (view->hex_mode)
    	bottom_first = (bottom_first + view->bytes_per_line - 1)
	    / view->bytes_per_line * view->bytes_per_line;
    view->bottom_first = bottom_first;
    
    return view->bottom_first;
}

static void
view_move_forward (WView *view, int i)
{
    view->start_display = move_forward2 (view, view->start_display, i, 0);
    if (!view->reading_pipe && view->start_display > get_bottom_first (view, 0, 0))
    	view->start_display = view->bottom_first;
    view->search_start = view->start_display;
    view->found_len = 0;
    view->last = view->first + ((LINES-2) * view->bytes_per_line);
    view->dirty++;
}


static void
move_to_top (WView *view)
{
    view->search_start = view->start_display = view->first;
    view->found_len = 0;
    view->last = view->first + ((LINES-2) * view->bytes_per_line);
    view->nib_shift = 0;
    view->edit_cursor = view->start_display; 
    view->dirty++;
}

static void
move_to_bottom (WView *view)
{
    view->search_start = view->start_display = get_bottom_first (view, 0, 1);
    view->found_len = 0;
    view->last = view->first + ((LINES-2) * view->bytes_per_line);
    view->edit_cursor = (view->edit_cursor < view->start_display) ?
        view->start_display : view->edit_cursor;
    view->dirty++;
}

/* Scroll left/right the view panel functions */
static void
move_right (WView *view)
{
    if (view->wrap_mode && !view->hex_mode)
        return;
    if (view->hex_mode) {
        view->last = view->first + ((LINES-2) * view->bytes_per_line);

        if (view->hex_mode && view->view_side == view_side_left) {
            view->nib_shift = 1 - view->nib_shift;
            if (view->nib_shift == 1)
                return;
        } 
        view->edit_cursor = (++view->edit_cursor <  view->last_byte) ?
            view->edit_cursor : view->last_byte - 1;
        if (view->edit_cursor >= view->last) {
           view->edit_cursor -= view->bytes_per_line;
           view_move_forward(view, 1);
        }
    } else
    if (--view->start_col > 0)
	view->start_col = 0;
    view->dirty++;
}

static void
move_left (WView *view)
{
    if (view->wrap_mode && !view->hex_mode)
        return;
    if (view->hex_mode) {
        if (view->hex_mode && view->view_side == view_side_left) {
            view->nib_shift = 1 - view->nib_shift;
            if (view->nib_shift == 0)
                return;
        } 
        if (view->edit_cursor > view->first)
	    --view->edit_cursor;
        if (view->edit_cursor < view->start_display) {
           view->edit_cursor += view->bytes_per_line;
           view_move_backward(view, 1);
        }
    } else
    if (++view->start_col > 0)
	view->start_col = 0;
    view->dirty++;
}

/* }}} */
/* {{{ Search routines */

/* Case insensitive search of text in data */
static int
icase_search_p (WView *view, char *text, char *data, int nothing)
{
    char *q;
    int lng;

    if ((q = _icase_search (text, data, &lng)) != 0) {
	view->found_len = lng;
	view->search_start = q - data - lng;
	return 1;
    }
    return 0;
}

static char *
grow_string_buffer (char *text, int *size)
{
    char *new;

    /* The grow steps */
    *size += 160;
    new = g_realloc (text, *size);
    if (!text){
        *new = 0;
    }
    return new;
}

static char *
get_line_at (WView *view, unsigned long *p, unsigned long *skipped)
{
    char *buffer = 0;
    int  buffer_size = 0;
    int  usable_size = 0;
    int  ch;
    int  direction = view->direction;
    unsigned long pos = *p;
    long i = 0;
    int  prev = 0;

    /* skip over all the possible zeros in the file */
    while ((ch = get_byte (view, pos)) == 0) {
	pos += direction; i++;
    }
    *skipped = i;

    if (pos) {
	prev = get_byte (view, pos - 1);
	if ((prev == -1) || (prev == '\n'))
	    prev = 0;
    }

    for (i = 0; ch != -1; ch = get_byte (view, pos)){

	if (i == usable_size){
	    buffer = grow_string_buffer (buffer, &buffer_size);
	    usable_size = buffer_size - 2;
	}

	pos += direction; i++;

	if (ch == '\n' || !ch){
	    break;
	}
	buffer [i] = ch;
    }
    if (buffer){
	buffer [0] = prev;
	buffer [i] = 0;

	/* If we are searching backwards, reverse the string */
	if (direction < 0) {
	    reverse_string (buffer + 1);
	}
    }

    *p = pos;
    return buffer;
}

/** Search status optmizations **/

/* The number of bytes between percent increments */
static int  update_steps;

/* Last point where we updated the status */
static long update_activate;

static void
search_update_steps (WView *view)
{
    if (view->s.st_size)
	update_steps = 40000;
    else
	update_steps = view->last_byte / 100;

    /* Do not update the percent display but every 20 ks */
    if (update_steps < 20000)
	update_steps = 20000;
}

static void
search (WView *view, char *text, int (*search)(WView *, char *, char *, int))
{
    int w = view->widget.cols - view->have_frame + 1;

    char *s = NULL;		/*  The line we read from the view buffer */
    long p, beginning;
    int found_len, search_start;
    int search_status;
    Dlg_head *d = 0;
    
    /* Used to keep track of where the line starts, when looking forward */
    /* is the index before transfering the line; the reverse case uses   */
    /* the position returned after the line has been read */
    long forward_line_start;
    long reverse_line_start;
    long t;
    /* Clear interrupt status */
    got_interrupt ();

    if (verbose){
	d = message (D_INSERT, _(" Search "), _("Searching %s"), text);
	mc_refresh ();
    }

    found_len = view->found_len;
    search_start = view->search_start;

    if (view->direction == 1){
	p = found_len ? search_start + 1 : search_start;
    } else {
	p = (found_len ? search_start : view->last) - 1;
    }
    beginning = p;

    /* Compute the percent steps */
    search_update_steps (view);
    update_activate = 0;

    for (; ; g_free (s)){
	if (p >= update_activate){
	    update_activate += update_steps;
	    if (verbose){
		view_percent (view, p, w, TRUE);
		mc_refresh ();
	    }
	    if (got_interrupt ())
		break;
	}
	forward_line_start = p;
	disable_interrupt_key ();
	s = get_line_at (view, &p, &t);
	reverse_line_start = p;
	enable_interrupt_key ();

	if (!s)
	    break;

	search_status = (*search) (view, text, s + 1, match_normal);
	if (search_status < 0){
	    g_free (s);
	    break;
	}

	if (search_status == 0)
	    continue;

	/* We found the string */
	
	if (*s && !view->search_start && (search == regexp_view_search) && (*text == '^')){
	    
	    /* We do not want to match a
	     * ^ regexp when not at the real
	     * beginning of some line
	     */
	    continue;
	}
	/* Record the position used to continue the search */
	if (view->direction == 1)
	    t += forward_line_start;
	else
	    t += reverse_line_start ? reverse_line_start + 3 : 0;
	view->search_start += t;

	if (t != beginning){
	    if (t > get_bottom_first (view, 0, 0))
		view->start_display = view->bottom_first;
	    else
		view->start_display = t;
	}

	g_free (s);
	break;
    }
    disable_interrupt_key ();
    if (verbose) {
	dlg_run_done (d);
	destroy_dlg (d);
    }
    if (!s) {
	message (0, _(" Search "), _(" Search string not found "));
	view->found_len = 0;
    }
}

/* Search buffer (it's size is len) in the complete buffer */
/* returns the position where the block was found or -1 if not found */
static long
block_search (WView *view, char *buffer, int len)
{
    int w = view->widget.cols - view->have_frame + 1;

    char *d = buffer, b;
    unsigned long e;

    /* clear interrupt status */
    got_interrupt ();
    enable_interrupt_key ();
    e = view->found_len ? view->search_start + 1 : view->search_start;

    search_update_steps (view);
    update_activate = 0;
    
    while (e < view->last_byte){
	if (e >= update_activate){
	    update_activate += update_steps;
	    if (verbose){
		view_percent (view, e, w, TRUE);
		mc_refresh ();
	    }
	    if (got_interrupt ())
		break;
	}
	b = get_byte (view, e++);
	
	if (*d == b){
	    d++;
	    if (d - buffer == len){
		disable_interrupt_key ();
		return e - len;
	    }
	} else {
	    e -= d - buffer;
	    d = buffer;
	}
    }
    disable_interrupt_key ();
    return -1;
}

/*
 * Search in the hex mode.  Supported input:
 * - numbers (oct, dec, hex).  Each of them matches one byte.
 * - strings in double quotes.  Matches exactly without quotes.
 */
static void
hex_search (WView *view, char *text)
{
    char *buffer;		/* Parsed search string */
    char *cur;			/* Current position in it */
    int  block_len;		/* Length of the search string */
    long pos;			/* Position of the string in the file */
    int  parse_error = 0;

    if (!*text) {
	view->found_len = 0;
	return;
    }

    /* buffer will never be longer that text */
    buffer = g_new (char, strlen (text));
    cur = buffer;

    /* First convert the string to a stream of bytes */
    while (*text) {
	int val;
	int ptr;

	/* Skip leading spaces */
	if (*text == ' ' || *text == '\t') {
	    text++;
	    continue;
	}

	/* %i matches octal, decimal, and hexadecimal numbers */
	if (sscanf (text, "%i%n", &val, &ptr) > 0) {
	    /* Allow signed and unsigned char in the user input */
	    if (val < -128 || val > 255) {
		parse_error = 1;
		break;
	    }

	    *cur++ = (char) val;
	    text += ptr;
	    continue;
	}

	/* Try quoted string, strip quotes */
	if (*text == '"') {
	    char *next_quote;

	    text++;
	    next_quote = strchr (text, '"');
	    if (next_quote) {
		memcpy (cur, text, next_quote - text);
		cur += next_quote - text;
		text = next_quote + 1;
		continue;
	    }
	    /* fall through */
	}

	parse_error = 1;
	break;
    }

    block_len = cur - buffer;

    /* No valid bytes in the user input */
    if (block_len <= 0 || parse_error) {
	message (0, _(" Search "), _("Invalid hex search expression"));
	g_free (buffer);
	view->found_len = 0;
	return;
    }

    /* Then start the search */
    pos = block_search (view, buffer, block_len);

    g_free (buffer);

    if (pos == -1){
	message (0, _(" Search "), _(" Search string not found "));
	view->found_len = 0;
	return;
    }
    
    view->search_start = pos;
    view->found_len = block_len;
    /* Set the edit cursor to the search position, left nibble */
    view->edit_cursor = view->search_start;
    view->nib_shift = 0;
    
    /* Adjust the file offset */
    view->start_display = (pos & (~(view->bytes_per_line-1)));
    if (view->start_display > get_bottom_first (view, 0, 0))
    	view->start_display = view->bottom_first;
}

static int regexp_view_search (WView *view, char *pattern, char *string, int match_type)
{
    static regex_t r;
    static char *old_pattern = NULL;
    static int old_type;
    regmatch_t pmatch[1];
    int i, flags = REG_ICASE;

    if (!old_pattern || strcmp (old_pattern, pattern) || old_type != match_type){
	if (old_pattern){
	    regfree (&r);
	    g_free (old_pattern);
	    old_pattern = 0;
	}
	for (i = 0; pattern[i] != 0; i++){
	    if (isupper ((unsigned char) pattern[i])){
		flags = 0;
		break;
	    }
	}
	flags |= REG_EXTENDED;
	if (regcomp (&r, pattern, flags)){
	    message (1, MSG_ERROR, _(" Invalid regular expression "));
	    return -1;
	}
	old_pattern = g_strdup (pattern);
	old_type = match_type;
    }
    if (regexec (&r, string, 1, pmatch, 0) != 0)
	return 0;
    view->found_len = pmatch[0].rm_eo - pmatch[0].rm_so;
    view->search_start = pmatch[0].rm_so;
    return 1;
}

static void do_regexp_search (void *xview, char *regexp)
{
    WView *view = (WView *) xview;
    
    view->search_exp = regexp;
    search (view, regexp, regexp_view_search);
    /* Had a refresh here */
    view->dirty++;
    view_update (view, TRUE);
}

static void do_normal_search (void *xview, char *text)
{
    WView *view = (WView *) xview;
    
    view->search_exp = text;
    if (view->hex_mode)
	hex_search (view, text);
    else 
	search (view, text, icase_search_p);
    /* Had a refresh here */
    view->dirty++;
    view_update (view, TRUE);
}

/* }}} */
/* {{{ Mouse and keyboard handling */

/* Real view only */
static void view_help_cmd (void)
{
    interactive_display (NULL, "[Internal File Viewer]");
    /*
    view_refresh (0);
    */
}

/* Both views */
static void toggle_wrap_mode (WView *view)
{
    if (view->hex_mode) {
        if (view->growing_buffer != 0) {
            return;
        }
        get_bottom_first (view, 1, 1);
        if (view->hexedit_mode) {
            view->view_side = 1 - view->view_side;
        } else {
            view->hexedit_mode = 1 - view->hexedit_mode;
        }
        view_labels (view);
        view->dirty++;
        view_update (view, TRUE);
		return;
    } 
    view->wrap_mode = 1 - view->wrap_mode;
    get_bottom_first (view, 1, 1);
    if (view->wrap_mode)
	view->start_col = 0;
    else {
	if (have_fast_cpu){
	    if (view->bottom_first < view->start_display)
		view->search_start = view->start_display = view->bottom_first;
    	    view->found_len = 0;
	}
    }
    view_labels (view);
    view->dirty++;
    view_update (view, TRUE);
}

/* Both views */
static void
toggle_hex_mode (WView *view)
{
    view->hex_mode = 1 - view->hex_mode;

    if (view->hex_mode){
        /* Shift the line start to 0x____0 on entry, restore it for Ascii */
        view->start_save = view->start_display;
        view->start_display -= view->start_display % view->bytes_per_line;
        view->edit_cursor = view->start_display;
	view->widget.options |= W_WANT_CURSOR;
	view->widget.parent->flags |= DLG_WANT_TAB;
    } else {
        view->start_display = view->start_save;
	view->widget.parent->flags &= ~DLG_WANT_TAB;
	view->widget.options &= ~W_WANT_CURSOR;
    }
    altered_hex_mode = 1;
    get_bottom_first (view, 1, 1);
    view_labels (view);
    view->dirty++;
    view_update (view, TRUE);
}

/* Ascii view */
static void
goto_line (WView *view)
{
    char *line, prompt [BUF_SMALL];
    int oldline = 1;
    int saved_wrap_mode = view->wrap_mode;
    unsigned long i;

    view->wrap_mode = 0;
    for (i = view->first; i < view->start_display; i++)
	if (get_byte (view, i) == '\n')
	    oldline ++;
    g_snprintf (prompt, sizeof (prompt), _(" The current line number is %d.\n"
		       " Enter the new line number:"), oldline);
    line = input_dialog (_(" Goto line "), prompt, "");
    if (line){
	if (*line){
	    move_to_top (view);
	    view_move_forward (view, atol (line) - 1);
	}
	g_free (line);
    }
    view->dirty++;
    view->wrap_mode = saved_wrap_mode;
    view_update (view, TRUE);
}

/* Hex view */
static void
goto_addr (WView *view)
{
    char *line, *error, prompt [BUF_SMALL];
    unsigned long addr;

    g_snprintf (prompt, sizeof (prompt), _(" The current address is 0x%lx.\n"
		       " Enter the new address:"), view->edit_cursor);
    line = input_dialog (_(" Goto Address "), prompt, "");
    if (line){
	if (*line) {
	    addr = strtol (line, &error, 0);
  	    if ((*error == '\0') && (addr <= view->last_byte)) { 
   	         move_to_top (view);
		 view_move_forward (view, addr/view->bytes_per_line);
		 view->edit_cursor = addr;
            }
        }
	g_free (line);
    }
    view->dirty++;
    view_update (view, TRUE);
}

/* Both views */
static void
regexp_search (WView *view, int direction)
{
    char *regexp = "";
    static char *old = 0;

    /* This is really an F6 key handler */
    if (view->hex_mode){
        /* Save it without a confirmation prompt */
	if (view->change_list)
	    save_edit_changes(view);
	return;
    }
    
    regexp = old ? old : regexp;
    regexp = input_dialog (_(" Search "), _(" Enter regexp:"), regexp);
    if ((!regexp)){
	return;
    }
    if ((!*regexp)){
	g_free (regexp);
	return;
    }
    if (old)
	g_free (old);
    old = regexp;
#if 0
    /* Mhm, do we really need to load all the file in the core? */
    if (view->bytes_read < view->last_byte)
	get_byte (view, view->last_byte-1);/* Get the whole file in to memory */
#endif
    view->direction = direction;
    do_regexp_search (view, regexp);

    view->last_search = do_regexp_search;
}

static void
regexp_search_cmd (WView *view)
{
    regexp_search (view, 1);
}

/* Both views */
static void
normal_search (WView *view, int direction)
{
    static char *old;
    char *exp = "";

    exp = old ? old : exp;

#ifdef HAVE_CHARSET
    if ( *exp )
	convert_to_display( exp );
#endif

    exp = input_dialog (_(" Search "), _(" Enter search string:"), exp);
    if ((!exp)){
	return;
    }
    if ((!*exp)){
	g_free (exp);
	return;
    }
    if (old)
	g_free (old);
    old = exp;

#ifdef HAVE_CHARSET
    convert_from_input( exp );
#endif

    view->direction = direction;
    do_normal_search (view, exp);
    view->last_search = do_normal_search;
}

static void
normal_search_cmd (WView *view)
{
    normal_search (view, 1);
}

static void
change_viewer (WView *view)
{
    char *s;
    char *t;


    if (*view->filename) {
        altered_magic_flag = 1;
        view->viewer_magic_flag = !view->viewer_magic_flag;
    	s = g_strdup (view->filename);
        if (view->command)
  	    t = g_strdup (view->command);
        else
            t = 0;

        view_done (view);
    	view_init (view, t, s, 0);
    	g_free (s);
    	if (t)
            g_free (t);
        view_labels (view);
        view->dirty++;
        view_update (view, TRUE);
    }
}

static void
change_nroff (WView *view)
{
    view->viewer_nroff_flag = !view->viewer_nroff_flag;
    altered_nroff_flag = 1;
    view_labels (view);
    view->dirty++;
    view_update (view, TRUE);
}

/* Real view only */
static void
view_quit_cmd (WView *view)
{
    if (view_ok_to_quit (view))
	dlg_stop (view->widget.parent);
}

/* Both views */
static void
view_labels (WView *view)
{
    Dlg_head *h = view->widget.parent;
    
    define_label (h, (Widget *) view, 1, _("Help"), view_help_cmd);
    
    my_define (h, 10, _("Quit"), view_quit_cmd, view);
    my_define (h, 4, view->hex_mode ? _("Ascii"): _("Hex"), toggle_hex_mode, view);
    my_define (h, 5, view->hex_mode ? _("Goto") : _("Line"),
	        view->hex_mode ? goto_addr : goto_line, 
		     view);
    my_define (h, 6, view->hex_mode ? _("Save") : _("RxSrch"), regexp_search_cmd, view);

    my_define (h, 2, view->hex_mode ? view->hexedit_mode ?
                     view->view_side == view_side_left ? _("EdText") : _("EdHex") :
                     view->growing_buffer ? "" : _("Edit") :
                     view->wrap_mode ? _("UnWrap") : _("Wrap"),
                     toggle_wrap_mode, view);
   
    my_define (h, 7, view->hex_mode ? _("HxSrch") : _("Search"),
	       normal_search_cmd, view);
    
    my_define (h, 8, view->viewer_magic_flag ? _("Raw") : _("Parse"),
	       change_viewer, view);

    if (!view->have_frame){
	my_define (h, 9, view->viewer_nroff_flag ? _("Unform") : _("Format"),
		   change_nroff, view);
	my_define (h, 3, _("Quit"), view_quit_cmd, view);
    }
    
    redraw_labels (h, (Widget *) view);
}

/* Both views */
static int
check_left_right_keys (WView *view, int c)
{
    if (c == KEY_LEFT)
	move_left (view);
    else if (c == KEY_RIGHT)
	move_right (view);
    else return 0;

    return 1;
}

static void
set_monitor (WView *view, int set_on)
{
    int old = view->monitor;
    
    view->monitor = set_on;
    
    if (view->monitor){
	move_to_bottom (view);
	view->bottom_first = -1;
	set_idle_proc (view->widget.parent, 1);
    } else {
	if (old)
	    set_idle_proc (view->widget.parent, 0);
    }
}

static void
continue_search (WView *view)
{
    if (view->last_search){
	(*view->last_search)(view, view->search_exp);
    } else {
	/* if not... then ask for an expression */
	normal_search (view, 1);
    }
}

/* Both views */
static int
view_handle_key (WView *view, int c)
{
    int prev_monitor = view->monitor;

    set_monitor (view, off);

#ifdef HAVE_CHARSET
    if (c >= 128 && c <= 255) {
 	c = conv_input[ c ];
    }
#endif

    if (view->hex_mode) {
        switch (c) {
        case 0x09:		/* Tab key */
            view->view_side = 1 - view->view_side;
            view->dirty++;
            return 1;

        case XCTRL('a'):        /* Beginning of line */
            view->edit_cursor -= view->edit_cursor % view->bytes_per_line;
            view->dirty++;
            return 1;
    
        case XCTRL('b'):        /* Character back */
            move_left(view);
            return 1;

        case XCTRL('e'):        /* End of line */
            view->edit_cursor -= view->edit_cursor % view->bytes_per_line;
            view->edit_cursor += view->bytes_per_line - 1;
            view->dirty++;
            return 1;
    
        case XCTRL('f'):        /* Character forward */
            move_right(view);
            return 1;
        }
    
	/* Trap 0-9,A-F,a-f for left side data entry (hex editing) */
        if (view->view_side == view_side_left){
            if ((c >= '0' && c <= '9') || 
                (c >= 'A' && c <= 'F') ||
                (c >= 'a' && c <= 'f')){
        
                put_editkey (view, c);
                return 1;
            }
        }
	
	/* Trap all printable characters for right side data entry */
	/* Also enter the value of the Enter key */
	if (view->view_side == view_side_right){
	    if (c < 256 && (is_printable (c) || (c == '\n'))){
		put_editkey(view, c);
		return 1;
	    }
	}
    }
    
    if (check_left_right_keys (view, c))
	return 1;
    
    if (check_movement_keys (c, 1, vheight, view, (movefn) view_move_backward, (movefn) view_move_forward,
			     (movefn) move_to_top, (movefn) move_to_bottom)){
	return 1;
    }
    switch (c){

    case '?':
	regexp_search (view, -1);
	return 1;
	
    case '/':
	regexp_search (view, 1);
	return 1;

	/* Continue search */
    case XCTRL('s'):
    case 'n':
    case KEY_F(17):
	continue_search (view);
	return 1;

    case XCTRL('r'):
	if (view->last_search){
	    (*view->last_search)(view, view->search_exp);
	} else {
	    normal_search (view, -1);
	}
	return 1;

	/* toggle ruler */
    case ALT('r'):
	switch (ruler){
	case 0:
	    ruler = 1; break;
	case 1:
	    ruler = 2; break;
	default:
	    ruler = 0; break;
	}
	view->dirty++;
	return 1;

    case 'h':
        move_left (view);
        return 1;
        
    case 'j':
    case '\n':
    case 'e':
    	view_move_forward (view, 1);
    	return 1;
    	
    case 'd':
        view_move_forward (view, vheight / 2);
        return 1;
        
    case 'u':
        view_move_backward (view, vheight / 2);
        return 1;
    	
    case 'k':
    case 'y':
        view_move_backward (view, 1);
        return 1;
        
    case 'l':
        move_right (view);
        return 1;
        
    case ' ':
    case 'f':
        view_move_forward (view, vheight - 1);
        return 1;

    case XCTRL('o'):
	view_other_cmd ();
	return 1;

    /* Unlike Ctrl-O, run a new shell if the subshell is not running.  */
    case '!':
	exec_shell ();
	return 1;
	
    case 'F':
	set_monitor (view, on);
	return 1;
	
    case 'b':
    	view_move_backward (view, vheight - 1);
    	return 1;
        
    case KEY_IC:
        view_move_backward (view, 2);
        return 1;
        
    case KEY_DC:
        view_move_forward (view, 2);
        return 1;

    case 'm':
	view->marks [view->marker] = view->start_display;
	return 1;

    case 'r':
	view->start_display = view->marks [view->marker];
	view->dirty++;
	return 1;
	
	/*  Use to indicate parent that we want to see the next/previous file */
	/* Only works on full screen mode */
    case XCTRL('f'):
    case XCTRL('b'):
	if (!view->have_frame)
	    view->move_dir = c == XCTRL('f') ? 1 : -1;
	/* fall */

    case 'q':
    case XCTRL('g'):
    case ESC_CHAR:
	if (view_ok_to_quit (view))
	    view->view_quit = 1;
	return 1;

#ifdef HAVE_CHARSET
    case XCTRL('t'):
	do_select_codepage();
	view->dirty++;
	view_update( view, TRUE );
	return 1;
#endif /* HAVE_CHARSET */

    }
    if (c >= '0' && c <= '9')
	view->marker = c - '0';

    /* Restore the monitor status */
    set_monitor (view, prev_monitor);
    
    /* Key not used */
    return 0;
}

/* Both views */
static int
view_event (WView * view, Gpm_Event * event, int *result)
{
    *result = MOU_NORMAL;

    /* We are not interested in the release events */
    if (!(event->type & (GPM_DOWN | GPM_DRAG)))
	return 0;

    /* Wheel events */
    if ((event->buttons & GPM_B_UP) && (event->type & GPM_DOWN)) {
	view_move_backward (view, 2);
	return 1;
    }
    if ((event->buttons & GPM_B_DOWN) && (event->type & GPM_DOWN)) {
	view_move_forward (view, 2);
	return 1;
    }

    /* Scrolling left and right */
    if (!view->wrap_mode) {
	if (event->x < view->widget.cols / 4) {
	    move_left (view);
	    goto processed;
	}
	if (event->x > 3 * vwidth / 4) {
	    move_right (view);
	    goto processed;
	}
    }

    /* Scrolling up and down */
    if (event->y < view->widget.lines / 3) {
	if (mouse_move_pages_viewer)
	    view_move_backward (view, view->widget.lines / 2 - 1);
	else
	    view_move_backward (view, 1);
	goto processed;
    } else if (event->y > 2 * vheight / 3) {
	if (mouse_move_pages_viewer)
	    view_move_forward (view, vheight / 2 - 1);
	else
	    view_move_forward (view, 1);
	goto processed;
    }

    return 0;

  processed:
    *result = MOU_REPEAT;
    return 1;
}

/* Real view only */
static int
real_view_event (Gpm_Event *event, void *x)
{
    int result;
    
    if (view_event ((WView *) x, event, &result))
    	view_update ((WView *) x, TRUE);
    return result;
}

/* }}} */
/* {{{ Window creation, destruction and a driver stub for real view */

static void
view_adjust_size (Dlg_head *h)
{
    WView      *view;
    WButtonBar *bar;

    /* Look up the viewer and the buttonbar, we assume only two widgets here */
    view = (WView *) find_widget_type (h, (callback_fn) view_callback);
    bar  = (WButtonBar *) view->widget.parent->current->next->widget;
    widget_set_size (&view->widget, 0, 0, LINES-1, COLS);
    widget_set_size (&bar->widget, LINES-1, 0, 1, COLS);

    view_update_bytes_per_line(view);
}

/* Callback for the view dialog */
static int
view_dialog_callback (Dlg_head * h, int id, int msg)
{
    switch (msg) {
    case DLG_RESIZE:
	view_adjust_size (h);
	return MSG_HANDLED;
    }
    return default_dlg_callback (h, id, msg);
}

/* Real view only */
int
view (char *_command, const char *_file, int *move_dir_p, int start_line)
{
    int error;
    WView *wview;
    WButtonBar *bar;
    Dlg_head *view_dlg;

    /* Create dialog and widgets, put them on the dialog */
    view_dlg =
	create_dlg (0, 0, LINES, COLS, NULL, view_dialog_callback,
		    "[Internal File Viewer]", NULL, DLG_NONE);

    wview = view_new (0, 0, COLS, LINES - 1, 0);

    bar = buttonbar_new (1);

    add_widget (view_dlg, wview);
    add_widget (view_dlg, bar);

    error = view_init (wview, _command, _file, start_line);
    if (move_dir_p)
	*move_dir_p = 0;

    /* Please note that if you add another widget,
     * you have to modify view_adjust_size to
     * be aware of it
     */
    if (!error) {
	run_dlg (view_dlg);
	if (move_dir_p)
	    *move_dir_p = wview->move_dir;
    }
    destroy_dlg (view_dlg);

    return !error;
}

static void
view_hook (void *v)
{
    WView *view = (WView *) v;
    WPanel *panel;

    /* If the user is busy typing, wait until he finishes to update the
       screen */
    if (!is_idle ()){
	if (!hook_present (idle_hook, view_hook))
	    add_hook (&idle_hook, view_hook, v);
	return;
    }

    delete_hook (&idle_hook, view_hook);
    
    if (get_current_type () == view_listing)
	panel = cpanel;
    else if (get_other_type () == view_listing)
	panel = other_panel;
    else
	return;

    view_init (view, 0, panel->dir.list [panel->selected].fname, 0);
    display (view);
    view_status (view, TRUE);
}

static int
view_callback (Dlg_head *h, WView *view, int msg, int par)
{
    int i;

    switch (msg) {
    case WIDGET_INIT:
	view_update_bytes_per_line (view);
	if (view->have_frame)
	    add_hook (&select_file_hook, view_hook, view);
	else
	    view_labels (view);
	break;

    case WIDGET_DRAW:
	display (view);
	view_status (view, TRUE);
	break;

    case WIDGET_CURSOR:
	if (view->hex_mode)
	    view_place_cursor (view);
	break;

    case WIDGET_KEY:
	i = view_handle_key ((WView *) view, par);
	if (view->view_quit)
	    dlg_stop (h);
	else {
	    view_update (view, TRUE);
	}
	return i;

    case WIDGET_IDLE:
	/* This event is generated when the user is using the 'F' flag */
	view->bottom_first = -1;
	move_to_bottom (view);
	display (view);
	view_status (view, TRUE);
	sleep (1);
	return 1;

    case WIDGET_FOCUS:
	view_labels (view);
	return 1;

    }
    return default_proc (h, msg, par);
}

WView *
view_new (int y, int x, int cols, int lines, int is_panel)
{
    WView *view = g_new0 (WView, 1);
    
    init_widget (&view->widget, y, x, lines, cols,
		 (callback_fn) view_callback,
		 (destroy_fn) view_destroy,
		 (mouse_h) real_view_event, NULL);

    view->hex_mode = default_hex_mode;
    view->hexedit_mode = default_hexedit_mode;
    view->viewer_magic_flag = default_magic_flag;
    view->viewer_nroff_flag = default_nroff_flag;
    view->have_frame = is_panel;
    view->last_byte = -1;
    view->wrap_mode = global_wrap_mode;
    
    widget_want_cursor (view->widget, 0);

    return view;
}

/* }}} */
/* {{{ Emacs local variables */
/*
   Cause emacs to enter folding mode for this file:
   Local variables:
   end:
   */
/* }}} */