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