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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [scripts/] [lxdialog/] [textbox.c] - Blame information for rev 1765

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/*
 *  textbox.c -- implements the text box
 *
 *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
 *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
 *
 *  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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
#include "dialog.h"
 
static void back_lines (int n);
static void print_page (WINDOW * win, int height, int width);
static void print_line (WINDOW * win, int row, int width);
static char *get_line (void);
static void print_position (WINDOW * win, int height, int width);
 
static int hscroll = 0, fd, file_size, bytes_read;
static int begin_reached = 1, end_reached = 0, page_length;
static char *buf, *page;
 
/*
 * Display text from a file in a dialog box.
 */
int
dialog_textbox (const char *title, const char *file, int height, int width)
{
    int i, x, y, cur_x, cur_y, fpos, key = 0;
    int passed_end;
    char search_term[MAX_LEN + 1];
    WINDOW *dialog, *text;
 
    search_term[0] = '\0';       /* no search term entered yet */
 
    /* Open input file for reading */
    if ((fd = open (file, O_RDONLY)) == -1) {
        endwin ();
        fprintf (stderr,
                 "\nCan't open input file in dialog_textbox().\n");
        exit (-1);
    }
    /* Get file size. Actually, 'file_size' is the real file size - 1,
       since it's only the last byte offset from the beginning */
    if ((file_size = lseek (fd, 0, SEEK_END)) == -1) {
        endwin ();
        fprintf (stderr, "\nError getting file size in dialog_textbox().\n");
        exit (-1);
    }
    /* Restore file pointer to beginning of file after getting file size */
    if (lseek (fd, 0, SEEK_SET) == -1) {
        endwin ();
        fprintf (stderr, "\nError moving file pointer in dialog_textbox().\n");
        exit (-1);
    }
    /* Allocate space for read buffer */
    if ((buf = malloc (BUF_SIZE + 1)) == NULL) {
        endwin ();
        fprintf (stderr, "\nCan't allocate memory in dialog_textbox().\n");
        exit (-1);
    }
    if ((bytes_read = read (fd, buf, BUF_SIZE)) == -1) {
        endwin ();
        fprintf (stderr, "\nError reading file in dialog_textbox().\n");
        exit (-1);
    }
    buf[bytes_read] = '\0';     /* mark end of valid data */
    page = buf;                 /* page is pointer to start of page to be displayed */
 
    /* center dialog box on screen */
    x = (COLS - width) / 2;
    y = (LINES - height) / 2;
 
 
    draw_shadow (stdscr, y, x, height, width);
 
    dialog = newwin (height, width, y, x);
    keypad (dialog, TRUE);
 
    /* Create window for text region, used for scrolling text */
    text = subwin (dialog, height - 4, width - 2, y + 1, x + 1);
    wattrset (text, dialog_attr);
    wbkgdset (text, dialog_attr & A_COLOR);
 
    keypad (text, TRUE);
 
    /* register the new window, along with its borders */
    draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);
 
    wattrset (dialog, border_attr);
    mvwaddch (dialog, height-3, 0, ACS_LTEE);
    for (i = 0; i < width - 2; i++)
        waddch (dialog, ACS_HLINE);
    wattrset (dialog, dialog_attr);
    wbkgdset (dialog, dialog_attr & A_COLOR);
    waddch (dialog, ACS_RTEE);
 
    if (title != NULL) {
        wattrset (dialog, title_attr);
        mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');
        waddstr (dialog, (char *)title);
        waddch (dialog, ' ');
    }
    print_button (dialog, " Exit ", height - 2, width / 2 - 4, TRUE);
    wnoutrefresh (dialog);
    getyx (dialog, cur_y, cur_x);       /* Save cursor position */
 
    /* Print first page of text */
    attr_clear (text, height - 4, width - 2, dialog_attr);
    print_page (text, height - 4, width - 2);
    print_position (dialog, height, width);
    wmove (dialog, cur_y, cur_x);       /* Restore cursor position */
    wrefresh (dialog);
 
    while ((key != ESC) && (key != '\n')) {
        key = wgetch (dialog);
        switch (key) {
        case 'E':               /* Exit */
        case 'e':
        case 'X':
        case 'x':
            delwin (dialog);
            free (buf);
            close (fd);
            return 0;
        case 'g':               /* First page */
        case KEY_HOME:
            if (!begin_reached) {
                begin_reached = 1;
                /* First page not in buffer? */
                if ((fpos = lseek (fd, 0, SEEK_CUR)) == -1) {
                    endwin ();
                    fprintf (stderr,
                      "\nError moving file pointer in dialog_textbox().\n");
                    exit (-1);
                }
                if (fpos > bytes_read) {        /* Yes, we have to read it in */
                    if (lseek (fd, 0, SEEK_SET) == -1) {
                        endwin ();
                        fprintf (stderr, "\nError moving file pointer in "
                                 "dialog_textbox().\n");
                        exit (-1);
                    }
                    if ((bytes_read = read (fd, buf, BUF_SIZE)) == -1) {
                        endwin ();
                        fprintf (stderr,
                             "\nError reading file in dialog_textbox().\n");
                        exit (-1);
                    }
                    buf[bytes_read] = '\0';
                }
                page = buf;
                print_page (text, height - 4, width - 2);
                print_position (dialog, height, width);
                wmove (dialog, cur_y, cur_x);   /* Restore cursor position */
                wrefresh (dialog);
            }
            break;
        case 'G':               /* Last page */
        case KEY_END:
 
            end_reached = 1;
            /* Last page not in buffer? */
            if ((fpos = lseek (fd, 0, SEEK_CUR)) == -1) {
                endwin ();
                fprintf (stderr,
                      "\nError moving file pointer in dialog_textbox().\n");
                exit (-1);
            }
            if (fpos < file_size) {     /* Yes, we have to read it in */
                if (lseek (fd, -BUF_SIZE, SEEK_END) == -1) {
                    endwin ();
                    fprintf (stderr,
                      "\nError moving file pointer in dialog_textbox().\n");
                    exit (-1);
                }
                if ((bytes_read = read (fd, buf, BUF_SIZE)) == -1) {
                    endwin ();
                    fprintf (stderr,
                             "\nError reading file in dialog_textbox().\n");
                    exit (-1);
                }
                buf[bytes_read] = '\0';
            }
            page = buf + bytes_read;
            back_lines (height - 4);
            print_page (text, height - 4, width - 2);
            print_position (dialog, height, width);
            wmove (dialog, cur_y, cur_x);       /* Restore cursor position */
            wrefresh (dialog);
            break;
        case 'K':               /* Previous line */
        case 'k':
        case KEY_UP:
            if (!begin_reached) {
                back_lines (page_length + 1);
 
                /* We don't call print_page() here but use scrolling to ensure
                   faster screen update. However, 'end_reached' and
                   'page_length' should still be updated, and 'page' should
                   point to start of next page. This is done by calling
                   get_line() in the following 'for' loop. */
                scrollok (text, TRUE);
                wscrl (text, -1);       /* Scroll text region down one line */
                scrollok (text, FALSE);
                page_length = 0;
                passed_end = 0;
                for (i = 0; i < height - 4; i++) {
                    if (!i) {
                        /* print first line of page */
                        print_line (text, 0, width - 2);
                        wnoutrefresh (text);
                    } else
                        /* Called to update 'end_reached' and 'page' */
                        get_line ();
                    if (!passed_end)
                        page_length++;
                    if (end_reached && !passed_end)
                        passed_end = 1;
                }
 
                print_position (dialog, height, width);
                wmove (dialog, cur_y, cur_x);   /* Restore cursor position */
                wrefresh (dialog);
            }
            break;
        case 'B':               /* Previous page */
        case 'b':
        case KEY_PPAGE:
            if (begin_reached)
                break;
            back_lines (page_length + height - 4);
            print_page (text, height - 4, width - 2);
            print_position (dialog, height, width);
            wmove (dialog, cur_y, cur_x);
            wrefresh (dialog);
            break;
        case 'J':               /* Next line */
        case 'j':
        case KEY_DOWN:
            if (!end_reached) {
                begin_reached = 0;
                scrollok (text, TRUE);
                scroll (text);  /* Scroll text region up one line */
                scrollok (text, FALSE);
                print_line (text, height - 5, width - 2);
                wnoutrefresh (text);
                print_position (dialog, height, width);
                wmove (dialog, cur_y, cur_x);   /* Restore cursor position */
                wrefresh (dialog);
            }
            break;
        case KEY_NPAGE:         /* Next page */
        case ' ':
            if (end_reached)
                break;
 
            begin_reached = 0;
            print_page (text, height - 4, width - 2);
            print_position (dialog, height, width);
            wmove (dialog, cur_y, cur_x);
            wrefresh (dialog);
            break;
        case '0':               /* Beginning of line */
        case 'H':               /* Scroll left */
        case 'h':
        case KEY_LEFT:
            if (hscroll <= 0)
                break;
 
            if (key == '0')
                hscroll = 0;
            else
                hscroll--;
            /* Reprint current page to scroll horizontally */
            back_lines (page_length);
            print_page (text, height - 4, width - 2);
            wmove (dialog, cur_y, cur_x);
            wrefresh (dialog);
            break;
        case 'L':               /* Scroll right */
        case 'l':
        case KEY_RIGHT:
            if (hscroll >= MAX_LEN)
                break;
            hscroll++;
            /* Reprint current page to scroll horizontally */
            back_lines (page_length);
            print_page (text, height - 4, width - 2);
            wmove (dialog, cur_y, cur_x);
            wrefresh (dialog);
            break;
        case ESC:
            break;
        }
    }
 
    delwin (dialog);
    free (buf);
    close (fd);
    return -1;                  /* ESC pressed */
}
 
/*
 * Go back 'n' lines in text file. Called by dialog_textbox().
 * 'page' will be updated to point to the desired line in 'buf'.
 */
static void
back_lines (int n)
{
    int i, fpos;
 
    begin_reached = 0;
    /* We have to distinguish between end_reached and !end_reached
       since at end of file, the line is not ended by a '\n'.
       The code inside 'if' basically does a '--page' to move one
       character backward so as to skip '\n' of the previous line */
    if (!end_reached) {
        /* Either beginning of buffer or beginning of file reached? */
        if (page == buf) {
            if ((fpos = lseek (fd, 0, SEEK_CUR)) == -1) {
                endwin ();
                fprintf (stderr, "\nError moving file pointer in "
                         "back_lines().\n");
                exit (-1);
            }
            if (fpos > bytes_read) {    /* Not beginning of file yet */
                /* We've reached beginning of buffer, but not beginning of
                   file yet, so read previous part of file into buffer.
                   Note that we only move backward for BUF_SIZE/2 bytes,
                   but not BUF_SIZE bytes to avoid re-reading again in
                   print_page() later */
                /* Really possible to move backward BUF_SIZE/2 bytes? */
                if (fpos < BUF_SIZE / 2 + bytes_read) {
                    /* No, move less then */
                    if (lseek (fd, 0, SEEK_SET) == -1) {
                        endwin ();
                        fprintf (stderr, "\nError moving file pointer in "
                                 "back_lines().\n");
                        exit (-1);
                    }
                    page = buf + fpos - bytes_read;
                } else {        /* Move backward BUF_SIZE/2 bytes */
                    if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR)
                        == -1) {
                        endwin ();
                        fprintf (stderr, "\nError moving file pointer "
                                 "in back_lines().\n");
                        exit (-1);
                    }
                    page = buf + BUF_SIZE / 2;
                }
                if ((bytes_read = read (fd, buf, BUF_SIZE)) == -1) {
                    endwin ();
                    fprintf (stderr, "\nError reading file in back_lines().\n");
                    exit (-1);
                }
                buf[bytes_read] = '\0';
            } else {            /* Beginning of file reached */
                begin_reached = 1;
                return;
            }
        }
        if (*(--page) != '\n') {        /* '--page' here */
            /* Something's wrong... */
            endwin ();
            fprintf (stderr, "\nInternal error in back_lines().\n");
            exit (-1);
        }
    }
    /* Go back 'n' lines */
    for (i = 0; i < n; i++)
        do {
            if (page == buf) {
                if ((fpos = lseek (fd, 0, SEEK_CUR)) == -1) {
                    endwin ();
                    fprintf (stderr,
                          "\nError moving file pointer in back_lines().\n");
                    exit (-1);
                }
                if (fpos > bytes_read) {
                    /* Really possible to move backward BUF_SIZE/2 bytes? */
                    if (fpos < BUF_SIZE / 2 + bytes_read) {
                        /* No, move less then */
                        if (lseek (fd, 0, SEEK_SET) == -1) {
                            endwin ();
                            fprintf (stderr, "\nError moving file pointer "
                                     "in back_lines().\n");
                            exit (-1);
                        }
                        page = buf + fpos - bytes_read;
                    } else {    /* Move backward BUF_SIZE/2 bytes */
                        if (lseek (fd, -(BUF_SIZE / 2 + bytes_read),
                                   SEEK_CUR) == -1) {
                            endwin ();
                            fprintf (stderr, "\nError moving file pointer"
                                     " in back_lines().\n");
                            exit (-1);
                        }
                        page = buf + BUF_SIZE / 2;
                    }
                    if ((bytes_read = read (fd, buf, BUF_SIZE)) == -1) {
                        endwin ();
                        fprintf (stderr, "\nError reading file in "
                                 "back_lines().\n");
                        exit (-1);
                    }
                    buf[bytes_read] = '\0';
                } else {        /* Beginning of file reached */
                    begin_reached = 1;
                    return;
                }
            }
        } while (*(--page) != '\n');
    page++;
}
 
/*
 * Print a new page of text. Called by dialog_textbox().
 */
static void
print_page (WINDOW * win, int height, int width)
{
    int i, passed_end = 0;
 
    page_length = 0;
    for (i = 0; i < height; i++) {
        print_line (win, i, width);
        if (!passed_end)
            page_length++;
        if (end_reached && !passed_end)
            passed_end = 1;
    }
    wnoutrefresh (win);
}
 
/*
 * Print a new line of text. Called by dialog_textbox() and print_page().
 */
static void
print_line (WINDOW * win, int row, int width)
{
    int i, y, x;
    char *line;
 
    line = get_line ();
    line += MIN (strlen (line), hscroll);       /* Scroll horizontally */
    wmove (win, row, 0); /* move cursor to correct line */
    waddch (win, ' ');
    waddnstr (win, line, MIN (strlen (line), width - 2));
 
    getyx (win, y, x);
    /* Clear 'residue' of previous line */
#if OLD_NCURSES
    for (i = 0; i < width - x; i++)
        waddch (win, ' ');
#else
    wclrtoeol(win);
#endif
}
 
/*
 * Return current line of text. Called by dialog_textbox() and print_line().
 * 'page' should point to start of current line before calling, and will be
 * updated to point to start of next line.
 */
static char *
get_line (void)
{
    int i = 0, fpos;
    static char line[MAX_LEN + 1];
 
    end_reached = 0;
    while (*page != '\n') {
        if (*page == '\0') {
            /* Either end of file or end of buffer reached */
            if ((fpos = lseek (fd, 0, SEEK_CUR)) == -1) {
                endwin ();
                fprintf (stderr, "\nError moving file pointer in "
                         "get_line().\n");
                exit (-1);
            }
            if (fpos < file_size) {     /* Not end of file yet */
                /* We've reached end of buffer, but not end of file yet,
                   so read next part of file into buffer */
                if ((bytes_read = read (fd, buf, BUF_SIZE)) == -1) {
                    endwin ();
                    fprintf (stderr, "\nError reading file in get_line().\n");
                    exit (-1);
                }
                buf[bytes_read] = '\0';
                page = buf;
            } else {
                if (!end_reached)
                    end_reached = 1;
                break;
            }
        } else if (i < MAX_LEN)
            line[i++] = *(page++);
        else {
            /* Truncate lines longer than MAX_LEN characters */
            if (i == MAX_LEN)
                line[i++] = '\0';
            page++;
        }
    }
    if (i <= MAX_LEN)
        line[i] = '\0';
    if (!end_reached)
        page++;                 /* move pass '\n' */
 
    return line;
}
 
/*
 * Print current position
 */
static void
print_position (WINDOW * win, int height, int width)
{
    int fpos, percent;
 
    if ((fpos = lseek (fd, 0, SEEK_CUR)) == -1) {
        endwin ();
        fprintf (stderr, "\nError moving file pointer in print_position().\n");
        exit (-1);
    }
    wattrset (win, position_indicator_attr);
    wbkgdset (win, position_indicator_attr & A_COLOR);
    percent = !file_size ?
        100 : ((fpos - bytes_read + page - buf) * 100) / file_size;
    wmove (win, height - 3, width - 9);
    wprintw (win, "(%3d%%)", percent);
}

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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [scripts/] [lxdialog/] [textbox.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	199	simons	`/*`
2			`* textbox.c -- implements the text box`
3			`*`
4			`* ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)`
5			`* MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)`
6			`*`
7			`* This program is free software; you can redistribute it and/or`
8			`* modify it under the terms of the GNU General Public License`
9			`* as published by the Free Software Foundation; either version 2`
10			`* of the License, or (at your option) any later version.`
11			`*`
12			`* This program is distributed in the hope that it will be useful,`
13			`* but WITHOUT ANY WARRANTY; without even the implied warranty of`
14			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
15			`* GNU General Public License for more details.`
16			`*`
17			`* You should have received a copy of the GNU General Public License`
18			`* along with this program; if not, write to the Free Software`
19			`* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.`
20			`*/`
21
22			`#include "dialog.h"`
23
24			`static void back_lines (int n);`
25			`static void print_page (WINDOW * win, int height, int width);`
26			`static void print_line (WINDOW * win, int row, int width);`
27			`static char *get_line (void);`
28			`static void print_position (WINDOW * win, int height, int width);`
29
30			`static int hscroll = 0, fd, file_size, bytes_read;`
31			`static int begin_reached = 1, end_reached = 0, page_length;`
32			`static char buf, page;`
33
34			`/*`
35			`* Display text from a file in a dialog box.`
36			`*/`
37			`int`
38			`dialog_textbox (const char title, const char file, int height, int width)`
39			`{`
40			`int i, x, y, cur_x, cur_y, fpos, key = 0;`
41			`int passed_end;`
42			`char search_term[MAX_LEN + 1];`
43			`WINDOW dialog, text;`
44
45			`search_term[0] = '\0'; /* no search term entered yet */`
46
47			`/* Open input file for reading */`
48			`if ((fd = open (file, O_RDONLY)) == -1) {`
49			`endwin ();`
50			`fprintf (stderr,`
51			`"\nCan't open input file in dialog_textbox().\n");`
52			`exit (-1);`
53			`}`
54			`/* Get file size. Actually, 'file_size' is the real file size - 1,`
55			`since it's only the last byte offset from the beginning */`
56			`if ((file_size = lseek (fd, 0, SEEK_END)) == -1) {`
57			`endwin ();`
58			`fprintf (stderr, "\nError getting file size in dialog_textbox().\n");`
59			`exit (-1);`
60			`}`
61			`/* Restore file pointer to beginning of file after getting file size */`
62			`if (lseek (fd, 0, SEEK_SET) == -1) {`
63			`endwin ();`
64			`fprintf (stderr, "\nError moving file pointer in dialog_textbox().\n");`
65			`exit (-1);`
66			`}`
67			`/* Allocate space for read buffer */`
68			`if ((buf = malloc (BUF_SIZE + 1)) == NULL) {`
69			`endwin ();`
70			`fprintf (stderr, "\nCan't allocate memory in dialog_textbox().\n");`
71			`exit (-1);`
72			`}`
73			`if ((bytes_read = read (fd, buf, BUF_SIZE)) == -1) {`
74			`endwin ();`
75			`fprintf (stderr, "\nError reading file in dialog_textbox().\n");`
76			`exit (-1);`
77			`}`
78			`buf[bytes_read] = '\0'; /* mark end of valid data */`
79			`page = buf; /* page is pointer to start of page to be displayed */`
80
81			`/* center dialog box on screen */`
82			`x = (COLS - width) / 2;`
83			`y = (LINES - height) / 2;`
84
85
86			`draw_shadow (stdscr, y, x, height, width);`
87
88			`dialog = newwin (height, width, y, x);`
89			`keypad (dialog, TRUE);`
90
91			`/* Create window for text region, used for scrolling text */`
92			`text = subwin (dialog, height - 4, width - 2, y + 1, x + 1);`
93			`wattrset (text, dialog_attr);`
94			`wbkgdset (text, dialog_attr & A_COLOR);`
95
96			`keypad (text, TRUE);`
97
98			`/* register the new window, along with its borders */`
99			`draw_box (dialog, 0, 0, height, width, dialog_attr, border_attr);`
100
101			`wattrset (dialog, border_attr);`
102			`mvwaddch (dialog, height-3, 0, ACS_LTEE);`
103			`for (i = 0; i < width - 2; i++)`
104			`waddch (dialog, ACS_HLINE);`
105			`wattrset (dialog, dialog_attr);`
106			`wbkgdset (dialog, dialog_attr & A_COLOR);`
107			`waddch (dialog, ACS_RTEE);`
108
109			`if (title != NULL) {`
110			`wattrset (dialog, title_attr);`
111			`mvwaddch (dialog, 0, (width - strlen(title))/2 - 1, ' ');`
112			`waddstr (dialog, (char *)title);`
113			`waddch (dialog, ' ');`
114			`}`
115			`print_button (dialog, " Exit ", height - 2, width / 2 - 4, TRUE);`
116			`wnoutrefresh (dialog);`
117			`getyx (dialog, cur_y, cur_x); /* Save cursor position */`
118
119			`/* Print first page of text */`
120			`attr_clear (text, height - 4, width - 2, dialog_attr);`
121			`print_page (text, height - 4, width - 2);`
122			`print_position (dialog, height, width);`
123			`wmove (dialog, cur_y, cur_x); /* Restore cursor position */`
124			`wrefresh (dialog);`
125
126			`while ((key != ESC) && (key != '\n')) {`
127			`key = wgetch (dialog);`
128			`switch (key) {`
129			`case 'E': /* Exit */`
130			`case 'e':`
131			`case 'X':`
132			`case 'x':`
133			`delwin (dialog);`
134			`free (buf);`
135			`close (fd);`
136			`return 0;`
137			`case 'g': /* First page */`
138			`case KEY_HOME:`
139			`if (!begin_reached) {`
140			`begin_reached = 1;`
141			`/* First page not in buffer? */`
142			`if ((fpos = lseek (fd, 0, SEEK_CUR)) == -1) {`
143			`endwin ();`
144			`fprintf (stderr,`
145			`"\nError moving file pointer in dialog_textbox().\n");`
146			`exit (-1);`
147			`}`
148			`if (fpos > bytes_read) { /* Yes, we have to read it in */`
149			`if (lseek (fd, 0, SEEK_SET) == -1) {`
150			`endwin ();`
151			`fprintf (stderr, "\nError moving file pointer in "`
152			`"dialog_textbox().\n");`
153			`exit (-1);`
154			`}`
155			`if ((bytes_read = read (fd, buf, BUF_SIZE)) == -1) {`
156			`endwin ();`
157			`fprintf (stderr,`
158			`"\nError reading file in dialog_textbox().\n");`
159			`exit (-1);`
160			`}`
161			`buf[bytes_read] = '\0';`
162			`}`
163			`page = buf;`
164			`print_page (text, height - 4, width - 2);`
165			`print_position (dialog, height, width);`
166			`wmove (dialog, cur_y, cur_x); /* Restore cursor position */`
167			`wrefresh (dialog);`
168			`}`
169			`break;`
170			`case 'G': /* Last page */`
171			`case KEY_END:`
172
173			`end_reached = 1;`
174			`/* Last page not in buffer? */`
175			`if ((fpos = lseek (fd, 0, SEEK_CUR)) == -1) {`
176			`endwin ();`
177			`fprintf (stderr,`
178			`"\nError moving file pointer in dialog_textbox().\n");`
179			`exit (-1);`
180			`}`
181			`if (fpos < file_size) { /* Yes, we have to read it in */`
182			`if (lseek (fd, -BUF_SIZE, SEEK_END) == -1) {`
183			`endwin ();`
184			`fprintf (stderr,`
185			`"\nError moving file pointer in dialog_textbox().\n");`
186			`exit (-1);`
187			`}`
188			`if ((bytes_read = read (fd, buf, BUF_SIZE)) == -1) {`
189			`endwin ();`
190			`fprintf (stderr,`
191			`"\nError reading file in dialog_textbox().\n");`
192			`exit (-1);`
193			`}`
194			`buf[bytes_read] = '\0';`
195			`}`
196			`page = buf + bytes_read;`
197			`back_lines (height - 4);`
198			`print_page (text, height - 4, width - 2);`
199			`print_position (dialog, height, width);`
200			`wmove (dialog, cur_y, cur_x); /* Restore cursor position */`
201			`wrefresh (dialog);`
202			`break;`
203			`case 'K': /* Previous line */`
204			`case 'k':`
205			`case KEY_UP:`
206			`if (!begin_reached) {`
207			`back_lines (page_length + 1);`
208
209			`/* We don't call print_page() here but use scrolling to ensure`
210			`faster screen update. However, 'end_reached' and`
211			`'page_length' should still be updated, and 'page' should`
212			`point to start of next page. This is done by calling`
213			`get_line() in the following 'for' loop. */`
214			`scrollok (text, TRUE);`
215			`wscrl (text, -1); /* Scroll text region down one line */`
216			`scrollok (text, FALSE);`
217			`page_length = 0;`
218			`passed_end = 0;`
219			`for (i = 0; i < height - 4; i++) {`
220			`if (!i) {`
221			`/* print first line of page */`
222			`print_line (text, 0, width - 2);`
223			`wnoutrefresh (text);`
224			`} else`
225			`/* Called to update 'end_reached' and 'page' */`
226			`get_line ();`
227			`if (!passed_end)`
228			`page_length++;`
229			`if (end_reached && !passed_end)`
230			`passed_end = 1;`
231			`}`
232
233			`print_position (dialog, height, width);`
234			`wmove (dialog, cur_y, cur_x); /* Restore cursor position */`
235			`wrefresh (dialog);`
236			`}`
237			`break;`
238			`case 'B': /* Previous page */`
239			`case 'b':`
240			`case KEY_PPAGE:`
241			`if (begin_reached)`
242			`break;`
243			`back_lines (page_length + height - 4);`
244			`print_page (text, height - 4, width - 2);`
245			`print_position (dialog, height, width);`
246			`wmove (dialog, cur_y, cur_x);`
247			`wrefresh (dialog);`
248			`break;`
249			`case 'J': /* Next line */`
250			`case 'j':`
251			`case KEY_DOWN:`
252			`if (!end_reached) {`
253			`begin_reached = 0;`
254			`scrollok (text, TRUE);`
255			`scroll (text); /* Scroll text region up one line */`
256			`scrollok (text, FALSE);`
257			`print_line (text, height - 5, width - 2);`
258			`wnoutrefresh (text);`
259			`print_position (dialog, height, width);`
260			`wmove (dialog, cur_y, cur_x); /* Restore cursor position */`
261			`wrefresh (dialog);`
262			`}`
263			`break;`
264			`case KEY_NPAGE: /* Next page */`
265			`case ' ':`
266			`if (end_reached)`
267			`break;`
268
269			`begin_reached = 0;`
270			`print_page (text, height - 4, width - 2);`
271			`print_position (dialog, height, width);`
272			`wmove (dialog, cur_y, cur_x);`
273			`wrefresh (dialog);`
274			`break;`
275			`case '0': /* Beginning of line */`
276			`case 'H': /* Scroll left */`
277			`case 'h':`
278			`case KEY_LEFT:`
279			`if (hscroll <= 0)`
280			`break;`
281
282			`if (key == '0')`
283			`hscroll = 0;`
284			`else`
285			`hscroll--;`
286			`/* Reprint current page to scroll horizontally */`
287			`back_lines (page_length);`
288			`print_page (text, height - 4, width - 2);`
289			`wmove (dialog, cur_y, cur_x);`
290			`wrefresh (dialog);`
291			`break;`
292			`case 'L': /* Scroll right */`
293			`case 'l':`
294			`case KEY_RIGHT:`
295			`if (hscroll >= MAX_LEN)`
296			`break;`
297			`hscroll++;`
298			`/* Reprint current page to scroll horizontally */`
299			`back_lines (page_length);`
300			`print_page (text, height - 4, width - 2);`
301			`wmove (dialog, cur_y, cur_x);`
302			`wrefresh (dialog);`
303			`break;`
304			`case ESC:`
305			`break;`
306			`}`
307			`}`
308
309			`delwin (dialog);`
310			`free (buf);`
311			`close (fd);`
312			`return -1; /* ESC pressed */`
313			`}`
314
315			`/*`
316			`* Go back 'n' lines in text file. Called by dialog_textbox().`
317			`* 'page' will be updated to point to the desired line in 'buf'.`
318			`*/`
319			`static void`
320			`back_lines (int n)`
321			`{`
322			`int i, fpos;`
323
324			`begin_reached = 0;`
325			`/* We have to distinguish between end_reached and !end_reached`
326			`since at end of file, the line is not ended by a '\n'.`
327			`The code inside 'if' basically does a '--page' to move one`
328			`character backward so as to skip '\n' of the previous line */`
329			`if (!end_reached) {`
330			`/* Either beginning of buffer or beginning of file reached? */`
331			`if (page == buf) {`
332			`if ((fpos = lseek (fd, 0, SEEK_CUR)) == -1) {`
333			`endwin ();`
334			`fprintf (stderr, "\nError moving file pointer in "`
335			`"back_lines().\n");`
336			`exit (-1);`
337			`}`
338			`if (fpos > bytes_read) { /* Not beginning of file yet */`
339			`/* We've reached beginning of buffer, but not beginning of`
340			`file yet, so read previous part of file into buffer.`
341			`Note that we only move backward for BUF_SIZE/2 bytes,`
342			`but not BUF_SIZE bytes to avoid re-reading again in`
343			`print_page() later */`
344			`/* Really possible to move backward BUF_SIZE/2 bytes? */`
345			`if (fpos < BUF_SIZE / 2 + bytes_read) {`
346			`/* No, move less then */`
347			`if (lseek (fd, 0, SEEK_SET) == -1) {`
348			`endwin ();`
349			`fprintf (stderr, "\nError moving file pointer in "`
350			`"back_lines().\n");`
351			`exit (-1);`
352			`}`
353			`page = buf + fpos - bytes_read;`
354			`} else { /* Move backward BUF_SIZE/2 bytes */`
355			`if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR)`
356			`== -1) {`
357			`endwin ();`
358			`fprintf (stderr, "\nError moving file pointer "`
359			`"in back_lines().\n");`
360			`exit (-1);`
361			`}`
362			`page = buf + BUF_SIZE / 2;`
363			`}`
364			`if ((bytes_read = read (fd, buf, BUF_SIZE)) == -1) {`
365			`endwin ();`
366			`fprintf (stderr, "\nError reading file in back_lines().\n");`
367			`exit (-1);`
368			`}`
369			`buf[bytes_read] = '\0';`
370			`} else { /* Beginning of file reached */`
371			`begin_reached = 1;`
372			`return;`
373			`}`
374			`}`
375			`if ((--page) != '\n') { / '--page' here */`
376			`/* Something's wrong... */`
377			`endwin ();`
378			`fprintf (stderr, "\nInternal error in back_lines().\n");`
379			`exit (-1);`
380			`}`
381			`}`
382			`/* Go back 'n' lines */`
383			`for (i = 0; i < n; i++)`
384			`do {`
385			`if (page == buf) {`
386			`if ((fpos = lseek (fd, 0, SEEK_CUR)) == -1) {`
387			`endwin ();`
388			`fprintf (stderr,`
389			`"\nError moving file pointer in back_lines().\n");`
390			`exit (-1);`
391			`}`
392			`if (fpos > bytes_read) {`
393			`/* Really possible to move backward BUF_SIZE/2 bytes? */`
394			`if (fpos < BUF_SIZE / 2 + bytes_read) {`
395			`/* No, move less then */`
396			`if (lseek (fd, 0, SEEK_SET) == -1) {`
397			`endwin ();`
398			`fprintf (stderr, "\nError moving file pointer "`
399			`"in back_lines().\n");`
400			`exit (-1);`
401			`}`
402			`page = buf + fpos - bytes_read;`
403			`} else { /* Move backward BUF_SIZE/2 bytes */`
404			`if (lseek (fd, -(BUF_SIZE / 2 + bytes_read),`
405			`SEEK_CUR) == -1) {`
406			`endwin ();`
407			`fprintf (stderr, "\nError moving file pointer"`
408			`" in back_lines().\n");`
409			`exit (-1);`
410			`}`
411			`page = buf + BUF_SIZE / 2;`
412			`}`
413			`if ((bytes_read = read (fd, buf, BUF_SIZE)) == -1) {`
414			`endwin ();`
415			`fprintf (stderr, "\nError reading file in "`
416			`"back_lines().\n");`
417			`exit (-1);`
418			`}`
419			`buf[bytes_read] = '\0';`
420			`} else { /* Beginning of file reached */`
421			`begin_reached = 1;`
422			`return;`
423			`}`
424			`}`
425			`} while (*(--page) != '\n');`
426			`page++;`
427			`}`
428
429			`/*`
430			`* Print a new page of text. Called by dialog_textbox().`
431			`*/`
432			`static void`
433			`print_page (WINDOW * win, int height, int width)`
434			`{`
435			`int i, passed_end = 0;`
436
437			`page_length = 0;`
438			`for (i = 0; i < height; i++) {`
439			`print_line (win, i, width);`
440			`if (!passed_end)`
441			`page_length++;`
442			`if (end_reached && !passed_end)`
443			`passed_end = 1;`
444			`}`
445			`wnoutrefresh (win);`
446			`}`
447
448			`/*`
449			`* Print a new line of text. Called by dialog_textbox() and print_page().`
450			`*/`
451			`static void`
452			`print_line (WINDOW * win, int row, int width)`
453			`{`
454			`int i, y, x;`
455			`char *line;`
456
457			`line = get_line ();`
458			`line += MIN (strlen (line), hscroll); /* Scroll horizontally */`
459			`wmove (win, row, 0); /* move cursor to correct line */`
460			`waddch (win, ' ');`
461			`waddnstr (win, line, MIN (strlen (line), width - 2));`
462
463			`getyx (win, y, x);`
464			`/* Clear 'residue' of previous line */`
465			`#if OLD_NCURSES`
466			`for (i = 0; i < width - x; i++)`
467			`waddch (win, ' ');`
468			`#else`
469			`wclrtoeol(win);`
470			`#endif`
471			`}`
472
473			`/*`
474			`* Return current line of text. Called by dialog_textbox() and print_line().`
475			`* 'page' should point to start of current line before calling, and will be`
476			`* updated to point to start of next line.`
477			`*/`
478			`static char *`
479			`get_line (void)`
480			`{`
481			`int i = 0, fpos;`
482			`static char line[MAX_LEN + 1];`
483
484			`end_reached = 0;`
485			`while (*page != '\n') {`
486			`if (*page == '\0') {`
487			`/* Either end of file or end of buffer reached */`
488			`if ((fpos = lseek (fd, 0, SEEK_CUR)) == -1) {`
489			`endwin ();`
490			`fprintf (stderr, "\nError moving file pointer in "`
491			`"get_line().\n");`
492			`exit (-1);`
493			`}`
494			`if (fpos < file_size) { /* Not end of file yet */`
495			`/* We've reached end of buffer, but not end of file yet,`
496			`so read next part of file into buffer */`
497			`if ((bytes_read = read (fd, buf, BUF_SIZE)) == -1) {`
498			`endwin ();`
499			`fprintf (stderr, "\nError reading file in get_line().\n");`
500			`exit (-1);`
501			`}`
502			`buf[bytes_read] = '\0';`
503			`page = buf;`
504			`} else {`
505			`if (!end_reached)`
506			`end_reached = 1;`
507			`break;`
508			`}`
509			`} else if (i < MAX_LEN)`
510			`line[i++] = *(page++);`
511			`else {`
512			`/* Truncate lines longer than MAX_LEN characters */`
513			`if (i == MAX_LEN)`
514			`line[i++] = '\0';`
515			`page++;`
516			`}`
517			`}`
518			`if (i <= MAX_LEN)`
519			`line[i] = '\0';`
520			`if (!end_reached)`
521			`page++; /* move pass '\n' */`
522
523			`return line;`
524			`}`
525
526			`/*`
527			`* Print current position`
528			`*/`
529			`static void`
530			`print_position (WINDOW * win, int height, int width)`
531			`{`
532			`int fpos, percent;`
533
534			`if ((fpos = lseek (fd, 0, SEEK_CUR)) == -1) {`
535			`endwin ();`
536			`fprintf (stderr, "\nError moving file pointer in print_position().\n");`
537			`exit (-1);`
538			`}`
539			`wattrset (win, position_indicator_attr);`
540			`wbkgdset (win, position_indicator_attr & A_COLOR);`
541			`percent = !file_size ?`
542			`100 : ((fpos - bytes_read + page - buf) * 100) / file_size;`
543			`wmove (win, height - 3, width - 9);`
544			`wprintw (win, "(%3d%%)", percent);`
545			`}`