[1765] | 1 | /*
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| 2 | * textbox.c -- implements the text box
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| 3 | *
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| 4 | * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
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| 5 | * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
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| 6 | *
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| 7 | * This program is free software; you can redistribute it and/or
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| 8 | * modify it under the terms of the GNU General Public License
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| 9 | * as published by the Free Software Foundation; either version 2
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| 10 | * of the License, or (at your option) any later version.
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| 11 | *
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| 12 | * This program is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with this program; if not, write to the Free Software
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| 19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 20 | */
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| 21 |
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| 22 | #include "dialog.h"
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| 23 |
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| 24 | static void back_lines(int n);
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| 25 | static void print_page(WINDOW * win, int height, int width);
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| 26 | static void print_line(WINDOW * win, int row, int width);
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| 27 | static char *get_line(void);
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| 28 | static void print_position(WINDOW * win, int height, int width);
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| 29 |
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| 30 | static int hscroll, fd, file_size, bytes_read;
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| 31 | static int begin_reached = 1, end_reached, page_length;
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| 32 | static char *buf, *page;
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| 33 |
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| 34 | /*
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| 35 | * Display text from a file in a dialog box.
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| 36 | */
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| 37 | int dialog_textbox(const char *title, const char *file, int height, int width)
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| 38 | {
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| 39 | int i, x, y, cur_x, cur_y, fpos, key = 0;
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| 40 | int passed_end;
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| 41 | WINDOW *dialog, *text;
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| 42 |
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| 43 | /* Open input file for reading */
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| 44 | if ((fd = open(file, O_RDONLY)) == -1) {
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| 45 | endwin();
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| 46 | fprintf(stderr, "\nCan't open input file in dialog_textbox().\n");
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| 47 | exit(-1);
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| 48 | }
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| 49 | /* Get file size. Actually, 'file_size' is the real file size - 1,
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| 50 | since it's only the last byte offset from the beginning */
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| 51 | if ((file_size = lseek(fd, 0, SEEK_END)) == -1) {
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| 52 | endwin();
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| 53 | fprintf(stderr, "\nError getting file size in dialog_textbox().\n");
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| 54 | exit(-1);
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| 55 | }
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| 56 | /* Restore file pointer to beginning of file after getting file size */
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| 57 | if (lseek(fd, 0, SEEK_SET) == -1) {
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| 58 | endwin();
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| 59 | fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
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| 60 | exit(-1);
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| 61 | }
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| 62 | /* Allocate space for read buffer */
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| 63 | if ((buf = malloc(BUF_SIZE + 1)) == NULL) {
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| 64 | endwin();
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| 65 | fprintf(stderr, "\nCan't allocate memory in dialog_textbox().\n");
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| 66 | exit(-1);
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| 67 | }
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| 68 | if ((bytes_read = read(fd, buf, BUF_SIZE)) == -1) {
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| 69 | endwin();
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| 70 | fprintf(stderr, "\nError reading file in dialog_textbox().\n");
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| 71 | exit(-1);
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| 72 | }
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| 73 | buf[bytes_read] = '\0'; /* mark end of valid data */
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| 74 | page = buf; /* page is pointer to start of page to be displayed */
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| 75 |
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| 76 | /* center dialog box on screen */
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| 77 | x = (COLS - width) / 2;
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| 78 | y = (LINES - height) / 2;
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| 79 |
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| 80 | draw_shadow(stdscr, y, x, height, width);
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| 81 |
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| 82 | dialog = newwin(height, width, y, x);
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| 83 | keypad(dialog, TRUE);
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| 84 |
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| 85 | /* Create window for text region, used for scrolling text */
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| 86 | text = subwin(dialog, height - 4, width - 2, y + 1, x + 1);
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| 87 | wattrset(text, dialog_attr);
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| 88 | wbkgdset(text, dialog_attr & A_COLOR);
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| 89 |
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| 90 | keypad(text, TRUE);
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| 91 |
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| 92 | /* register the new window, along with its borders */
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| 93 | draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr);
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| 94 |
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| 95 | wattrset(dialog, border_attr);
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| 96 | mvwaddch(dialog, height - 3, 0, ACS_LTEE);
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| 97 | for (i = 0; i < width - 2; i++)
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| 98 | waddch(dialog, ACS_HLINE);
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| 99 | wattrset(dialog, dialog_attr);
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| 100 | wbkgdset(dialog, dialog_attr & A_COLOR);
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| 101 | waddch(dialog, ACS_RTEE);
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| 102 |
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| 103 | print_title(dialog, title, width);
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| 104 |
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| 105 | print_button(dialog, " Exit ", height - 2, width / 2 - 4, TRUE);
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| 106 | wnoutrefresh(dialog);
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| 107 | getyx(dialog, cur_y, cur_x); /* Save cursor position */
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| 108 |
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| 109 | /* Print first page of text */
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| 110 | attr_clear(text, height - 4, width - 2, dialog_attr);
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| 111 | print_page(text, height - 4, width - 2);
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| 112 | print_position(dialog, height, width);
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| 113 | wmove(dialog, cur_y, cur_x); /* Restore cursor position */
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| 114 | wrefresh(dialog);
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| 115 |
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| 116 | while ((key != ESC) && (key != '\n')) {
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| 117 | key = wgetch(dialog);
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| 118 | switch (key) {
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| 119 | case 'E': /* Exit */
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| 120 | case 'e':
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| 121 | case 'X':
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| 122 | case 'x':
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| 123 | delwin(dialog);
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| 124 | free(buf);
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| 125 | close(fd);
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| 126 | return 0;
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| 127 | case 'g': /* First page */
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| 128 | case KEY_HOME:
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| 129 | if (!begin_reached) {
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| 130 | begin_reached = 1;
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| 131 | /* First page not in buffer? */
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| 132 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
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| 133 | endwin();
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| 134 | fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
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| 135 | exit(-1);
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| 136 | }
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| 137 | if (fpos > bytes_read) { /* Yes, we have to read it in */
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| 138 | if (lseek(fd, 0, SEEK_SET) == -1) {
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| 139 | endwin();
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| 140 | fprintf(stderr, "\nError moving file pointer in "
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| 141 | "dialog_textbox().\n");
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| 142 | exit(-1);
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| 143 | }
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| 144 | if ((bytes_read =
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| 145 | read(fd, buf, BUF_SIZE)) == -1) {
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| 146 | endwin();
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| 147 | fprintf(stderr, "\nError reading file in dialog_textbox().\n");
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| 148 | exit(-1);
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| 149 | }
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| 150 | buf[bytes_read] = '\0';
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| 151 | }
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| 152 | page = buf;
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| 153 | print_page(text, height - 4, width - 2);
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| 154 | print_position(dialog, height, width);
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| 155 | wmove(dialog, cur_y, cur_x); /* Restore cursor position */
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| 156 | wrefresh(dialog);
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| 157 | }
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| 158 | break;
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| 159 | case 'G': /* Last page */
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| 160 | case KEY_END:
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| 161 |
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| 162 | end_reached = 1;
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| 163 | /* Last page not in buffer? */
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| 164 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
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| 165 | endwin();
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| 166 | fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
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| 167 | exit(-1);
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| 168 | }
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| 169 | if (fpos < file_size) { /* Yes, we have to read it in */
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| 170 | if (lseek(fd, -BUF_SIZE, SEEK_END) == -1) {
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| 171 | endwin();
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| 172 | fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n");
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| 173 | exit(-1);
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| 174 | }
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| 175 | if ((bytes_read =
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| 176 | read(fd, buf, BUF_SIZE)) == -1) {
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| 177 | endwin();
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| 178 | fprintf(stderr, "\nError reading file in dialog_textbox().\n");
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| 179 | exit(-1);
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| 180 | }
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| 181 | buf[bytes_read] = '\0';
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| 182 | }
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| 183 | page = buf + bytes_read;
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| 184 | back_lines(height - 4);
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| 185 | print_page(text, height - 4, width - 2);
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| 186 | print_position(dialog, height, width);
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| 187 | wmove(dialog, cur_y, cur_x); /* Restore cursor position */
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| 188 | wrefresh(dialog);
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| 189 | break;
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| 190 | case 'K': /* Previous line */
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| 191 | case 'k':
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| 192 | case KEY_UP:
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| 193 | if (!begin_reached) {
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| 194 | back_lines(page_length + 1);
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| 195 |
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| 196 | /* We don't call print_page() here but use scrolling to ensure
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| 197 | faster screen update. However, 'end_reached' and
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| 198 | 'page_length' should still be updated, and 'page' should
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| 199 | point to start of next page. This is done by calling
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| 200 | get_line() in the following 'for' loop. */
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| 201 | scrollok(text, TRUE);
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| 202 | wscrl(text, -1); /* Scroll text region down one line */
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| 203 | scrollok(text, FALSE);
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| 204 | page_length = 0;
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| 205 | passed_end = 0;
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| 206 | for (i = 0; i < height - 4; i++) {
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| 207 | if (!i) {
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| 208 | /* print first line of page */
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| 209 | print_line(text, 0, width - 2);
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| 210 | wnoutrefresh(text);
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| 211 | } else
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| 212 | /* Called to update 'end_reached' and 'page' */
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| 213 | get_line();
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| 214 | if (!passed_end)
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| 215 | page_length++;
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| 216 | if (end_reached && !passed_end)
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| 217 | passed_end = 1;
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| 218 | }
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| 219 |
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| 220 | print_position(dialog, height, width);
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| 221 | wmove(dialog, cur_y, cur_x); /* Restore cursor position */
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| 222 | wrefresh(dialog);
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| 223 | }
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| 224 | break;
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| 225 | case 'B': /* Previous page */
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| 226 | case 'b':
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| 227 | case KEY_PPAGE:
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| 228 | if (begin_reached)
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| 229 | break;
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| 230 | back_lines(page_length + height - 4);
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| 231 | print_page(text, height - 4, width - 2);
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| 232 | print_position(dialog, height, width);
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| 233 | wmove(dialog, cur_y, cur_x);
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| 234 | wrefresh(dialog);
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| 235 | break;
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| 236 | case 'J': /* Next line */
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| 237 | case 'j':
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| 238 | case KEY_DOWN:
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| 239 | if (!end_reached) {
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| 240 | begin_reached = 0;
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| 241 | scrollok(text, TRUE);
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| 242 | scroll(text); /* Scroll text region up one line */
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| 243 | scrollok(text, FALSE);
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| 244 | print_line(text, height - 5, width - 2);
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| 245 | wnoutrefresh(text);
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| 246 | print_position(dialog, height, width);
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| 247 | wmove(dialog, cur_y, cur_x); /* Restore cursor position */
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| 248 | wrefresh(dialog);
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| 249 | }
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| 250 | break;
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| 251 | case KEY_NPAGE: /* Next page */
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| 252 | case ' ':
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| 253 | if (end_reached)
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| 254 | break;
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| 255 |
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| 256 | begin_reached = 0;
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| 257 | print_page(text, height - 4, width - 2);
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| 258 | print_position(dialog, height, width);
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| 259 | wmove(dialog, cur_y, cur_x);
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| 260 | wrefresh(dialog);
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| 261 | break;
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| 262 | case '0': /* Beginning of line */
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| 263 | case 'H': /* Scroll left */
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| 264 | case 'h':
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| 265 | case KEY_LEFT:
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| 266 | if (hscroll <= 0)
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| 267 | break;
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| 268 |
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| 269 | if (key == '0')
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| 270 | hscroll = 0;
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| 271 | else
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| 272 | hscroll--;
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| 273 | /* Reprint current page to scroll horizontally */
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| 274 | back_lines(page_length);
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| 275 | print_page(text, height - 4, width - 2);
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| 276 | wmove(dialog, cur_y, cur_x);
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| 277 | wrefresh(dialog);
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| 278 | break;
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| 279 | case 'L': /* Scroll right */
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| 280 | case 'l':
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| 281 | case KEY_RIGHT:
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| 282 | if (hscroll >= MAX_LEN)
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| 283 | break;
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| 284 | hscroll++;
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| 285 | /* Reprint current page to scroll horizontally */
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| 286 | back_lines(page_length);
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| 287 | print_page(text, height - 4, width - 2);
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| 288 | wmove(dialog, cur_y, cur_x);
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| 289 | wrefresh(dialog);
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| 290 | break;
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| 291 | case ESC:
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| 292 | break;
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| 293 | }
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| 294 | }
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| 295 |
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| 296 | delwin(dialog);
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| 297 | free(buf);
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| 298 | close(fd);
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| 299 | return -1; /* ESC pressed */
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| 300 | }
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| 301 |
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| 302 | /*
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| 303 | * Go back 'n' lines in text file. Called by dialog_textbox().
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| 304 | * 'page' will be updated to point to the desired line in 'buf'.
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| 305 | */
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| 306 | static void back_lines(int n)
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| 307 | {
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| 308 | int i, fpos;
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| 309 |
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| 310 | begin_reached = 0;
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| 311 | /* We have to distinguish between end_reached and !end_reached
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| 312 | since at end of file, the line is not ended by a '\n'.
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| 313 | The code inside 'if' basically does a '--page' to move one
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| 314 | character backward so as to skip '\n' of the previous line */
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| 315 | if (!end_reached) {
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| 316 | /* Either beginning of buffer or beginning of file reached? */
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| 317 | if (page == buf) {
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| 318 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
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| 319 | endwin();
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| 320 | fprintf(stderr, "\nError moving file pointer in "
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| 321 | "back_lines().\n");
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| 322 | exit(-1);
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| 323 | }
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| 324 | if (fpos > bytes_read) { /* Not beginning of file yet */
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| 325 | /* We've reached beginning of buffer, but not beginning of
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| 326 | file yet, so read previous part of file into buffer.
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| 327 | Note that we only move backward for BUF_SIZE/2 bytes,
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| 328 | but not BUF_SIZE bytes to avoid re-reading again in
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| 329 | print_page() later */
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| 330 | /* Really possible to move backward BUF_SIZE/2 bytes? */
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| 331 | if (fpos < BUF_SIZE / 2 + bytes_read) {
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| 332 | /* No, move less then */
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| 333 | if (lseek(fd, 0, SEEK_SET) == -1) {
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| 334 | endwin();
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| 335 | fprintf(stderr, "\nError moving file pointer in "
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| 336 | "back_lines().\n");
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| 337 | exit(-1);
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| 338 | }
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| 339 | page = buf + fpos - bytes_read;
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| 340 | } else { /* Move backward BUF_SIZE/2 bytes */
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| 341 | if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) {
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| 342 | endwin();
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| 343 | fprintf(stderr, "\nError moving file pointer "
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| 344 | "in back_lines().\n");
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| 345 | exit(-1);
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| 346 | }
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| 347 | page = buf + BUF_SIZE / 2;
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| 348 | }
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| 349 | if ((bytes_read =
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| 350 | read(fd, buf, BUF_SIZE)) == -1) {
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| 351 | endwin();
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| 352 | fprintf(stderr, "\nError reading file in back_lines().\n");
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| 353 | exit(-1);
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| 354 | }
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| 355 | buf[bytes_read] = '\0';
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| 356 | } else { /* Beginning of file reached */
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| 357 | begin_reached = 1;
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| 358 | return;
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| 359 | }
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| 360 | }
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| 361 | if (*(--page) != '\n') { /* '--page' here */
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| 362 | /* Something's wrong... */
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| 363 | endwin();
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| 364 | fprintf(stderr, "\nInternal error in back_lines().\n");
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| 365 | exit(-1);
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| 366 | }
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| 367 | }
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| 368 | /* Go back 'n' lines */
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| 369 | for (i = 0; i < n; i++)
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| 370 | do {
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| 371 | if (page == buf) {
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| 372 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
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| 373 | endwin();
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| 374 | fprintf(stderr, "\nError moving file pointer in back_lines().\n");
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| 375 | exit(-1);
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| 376 | }
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| 377 | if (fpos > bytes_read) {
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| 378 | /* Really possible to move backward BUF_SIZE/2 bytes? */
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| 379 | if (fpos < BUF_SIZE / 2 + bytes_read) {
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| 380 | /* No, move less then */
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| 381 | if (lseek(fd, 0, SEEK_SET) == -1) {
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| 382 | endwin();
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| 383 | fprintf(stderr, "\nError moving file pointer "
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| 384 | "in back_lines().\n");
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| 385 | exit(-1);
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| 386 | }
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| 387 | page = buf + fpos - bytes_read;
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| 388 | } else { /* Move backward BUF_SIZE/2 bytes */
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| 389 | if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) {
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| 390 | endwin();
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| 391 | fprintf(stderr, "\nError moving file pointer"
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| 392 | " in back_lines().\n");
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| 393 | exit(-1);
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| 394 | }
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| 395 | page = buf + BUF_SIZE / 2;
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| 396 | }
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| 397 | if ((bytes_read =
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| 398 | read(fd, buf, BUF_SIZE)) == -1) {
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| 399 | endwin();
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| 400 | fprintf(stderr, "\nError reading file in "
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| 401 | "back_lines().\n");
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| 402 | exit(-1);
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| 403 | }
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| 404 | buf[bytes_read] = '\0';
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| 405 | } else { /* Beginning of file reached */
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| 406 | begin_reached = 1;
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| 407 | return;
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| 408 | }
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| 409 | }
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| 410 | } while (*(--page) != '\n');
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| 411 | page++;
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| 412 | }
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| 413 |
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| 414 | /*
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| 415 | * Print a new page of text. Called by dialog_textbox().
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| 416 | */
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| 417 | static void print_page(WINDOW * win, int height, int width)
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| 418 | {
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| 419 | int i, passed_end = 0;
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| 420 |
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| 421 | page_length = 0;
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| 422 | for (i = 0; i < height; i++) {
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| 423 | print_line(win, i, width);
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| 424 | if (!passed_end)
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| 425 | page_length++;
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| 426 | if (end_reached && !passed_end)
|
---|
| 427 | passed_end = 1;
|
---|
| 428 | }
|
---|
| 429 | wnoutrefresh(win);
|
---|
| 430 | }
|
---|
| 431 |
|
---|
| 432 | /*
|
---|
| 433 | * Print a new line of text. Called by dialog_textbox() and print_page().
|
---|
| 434 | */
|
---|
| 435 | static void print_line(WINDOW * win, int row, int width)
|
---|
| 436 | {
|
---|
| 437 | char *line;
|
---|
| 438 |
|
---|
| 439 | line = get_line();
|
---|
| 440 | line += MIN(strlen(line), hscroll); /* Scroll horizontally */
|
---|
| 441 | wmove(win, row, 0); /* move cursor to correct line */
|
---|
| 442 | waddch(win, ' ');
|
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| 443 | waddnstr(win, line, MIN(strlen(line), width - 2));
|
---|
| 444 |
|
---|
| 445 | /* Clear 'residue' of previous line */
|
---|
| 446 | #if OLD_NCURSES
|
---|
| 447 | {
|
---|
| 448 | int i;
|
---|
[3232] | 449 | int y, x;
|
---|
| 450 |
|
---|
| 451 | getyx(win, y, x);
|
---|
[1765] | 452 | for (i = 0; i < width - x; i++)
|
---|
| 453 | waddch(win, ' ');
|
---|
| 454 | }
|
---|
| 455 | #else
|
---|
| 456 | wclrtoeol(win);
|
---|
| 457 | #endif
|
---|
| 458 | }
|
---|
| 459 |
|
---|
| 460 | /*
|
---|
| 461 | * Return current line of text. Called by dialog_textbox() and print_line().
|
---|
| 462 | * 'page' should point to start of current line before calling, and will be
|
---|
| 463 | * updated to point to start of next line.
|
---|
| 464 | */
|
---|
| 465 | static char *get_line(void)
|
---|
| 466 | {
|
---|
| 467 | int i = 0, fpos;
|
---|
| 468 | static char line[MAX_LEN + 1];
|
---|
| 469 |
|
---|
| 470 | end_reached = 0;
|
---|
| 471 | while (*page != '\n') {
|
---|
| 472 | if (*page == '\0') {
|
---|
| 473 | /* Either end of file or end of buffer reached */
|
---|
| 474 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
|
---|
| 475 | endwin();
|
---|
| 476 | fprintf(stderr, "\nError moving file pointer in "
|
---|
| 477 | "get_line().\n");
|
---|
| 478 | exit(-1);
|
---|
| 479 | }
|
---|
| 480 | if (fpos < file_size) { /* Not end of file yet */
|
---|
| 481 | /* We've reached end of buffer, but not end of file yet,
|
---|
| 482 | so read next part of file into buffer */
|
---|
| 483 | if ((bytes_read =
|
---|
| 484 | read(fd, buf, BUF_SIZE)) == -1) {
|
---|
| 485 | endwin();
|
---|
| 486 | fprintf(stderr, "\nError reading file in get_line().\n");
|
---|
| 487 | exit(-1);
|
---|
| 488 | }
|
---|
| 489 | buf[bytes_read] = '\0';
|
---|
| 490 | page = buf;
|
---|
| 491 | } else {
|
---|
| 492 | if (!end_reached)
|
---|
| 493 | end_reached = 1;
|
---|
| 494 | break;
|
---|
| 495 | }
|
---|
| 496 | } else if (i < MAX_LEN)
|
---|
| 497 | line[i++] = *(page++);
|
---|
| 498 | else {
|
---|
| 499 | /* Truncate lines longer than MAX_LEN characters */
|
---|
| 500 | if (i == MAX_LEN)
|
---|
| 501 | line[i++] = '\0';
|
---|
| 502 | page++;
|
---|
| 503 | }
|
---|
| 504 | }
|
---|
| 505 | if (i <= MAX_LEN)
|
---|
| 506 | line[i] = '\0';
|
---|
| 507 | if (!end_reached)
|
---|
| 508 | page++; /* move pass '\n' */
|
---|
| 509 |
|
---|
| 510 | return line;
|
---|
| 511 | }
|
---|
| 512 |
|
---|
| 513 | /*
|
---|
| 514 | * Print current position
|
---|
| 515 | */
|
---|
| 516 | static void print_position(WINDOW * win, int height, int width)
|
---|
| 517 | {
|
---|
| 518 | int fpos, percent;
|
---|
| 519 |
|
---|
| 520 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) {
|
---|
| 521 | endwin();
|
---|
| 522 | fprintf(stderr, "\nError moving file pointer in print_position().\n");
|
---|
| 523 | exit(-1);
|
---|
| 524 | }
|
---|
| 525 | wattrset(win, position_indicator_attr);
|
---|
| 526 | wbkgdset(win, position_indicator_attr & A_COLOR);
|
---|
| 527 | percent = !file_size ?
|
---|
| 528 | 100 : ((fpos - bytes_read + page - buf) * 100) / file_size;
|
---|
| 529 | wmove(win, height - 3, width - 9);
|
---|
| 530 | wprintw(win, "(%3d%%)", percent);
|
---|
| 531 | }
|
---|