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)
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427 | passed_end = 1;
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428 | }
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429 | wnoutrefresh(win);
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430 | }
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431 |
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432 | /*
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433 | * Print a new line of text. Called by dialog_textbox() and print_page().
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434 | */
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435 | static void print_line(WINDOW * win, int row, int width)
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436 | {
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437 | char *line;
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438 |
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439 | line = get_line();
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440 | line += MIN(strlen(line), hscroll); /* Scroll horizontally */
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441 | wmove(win, row, 0); /* move cursor to correct line */
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442 | waddch(win, ' ');
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443 | waddnstr(win, line, MIN(strlen(line), width - 2));
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444 |
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445 | /* Clear 'residue' of previous line */
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446 | #if OLD_NCURSES
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447 | {
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448 | int i;
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449 | int y, x;
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450 |
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451 | getyx(win, y, x);
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452 | for (i = 0; i < width - x; i++)
|
---|
453 | waddch(win, ' ');
|
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454 | }
|
---|
455 | #else
|
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456 | wclrtoeol(win);
|
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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 | }
|
---|