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); |
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427 | if (!passed_end) |
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428 | page_length++; |
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429 | if (end_reached && !passed_end) |
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430 | passed_end = 1; |
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431 | } |
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432 | wnoutrefresh(win); |
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433 | } |
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434 | |
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435 | /* |
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436 | * Print a new line of text. Called by dialog_textbox() and print_page(). |
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437 | */ |
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438 | static void print_line(WINDOW * win, int row, int width) |
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439 | { |
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440 | int y, x; |
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441 | char *line; |
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442 | |
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443 | line = get_line(); |
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444 | line += MIN(strlen(line), hscroll); /* Scroll horizontally */ |
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445 | wmove(win, row, 0); /* move cursor to correct line */ |
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446 | waddch(win, ' '); |
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447 | waddnstr(win, line, MIN(strlen(line), width - 2)); |
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448 | |
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449 | getyx(win, y, x); |
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450 | /* Clear 'residue' of previous line */ |
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451 | #if OLD_NCURSES |
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452 | { |
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453 | int i; |
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454 | for (i = 0; i < width - x; i++) |
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455 | waddch(win, ' '); |
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456 | } |
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457 | #else |
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458 | wclrtoeol(win); |
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459 | #endif |
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460 | } |
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461 | |
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462 | /* |
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463 | * Return current line of text. Called by dialog_textbox() and print_line(). |
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464 | * 'page' should point to start of current line before calling, and will be |
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465 | * updated to point to start of next line. |
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466 | */ |
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467 | static char *get_line(void) |
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468 | { |
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469 | int i = 0, fpos; |
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470 | static char line[MAX_LEN + 1]; |
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471 | |
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472 | end_reached = 0; |
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473 | while (*page != '\n') { |
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474 | if (*page == '\0') { |
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475 | /* Either end of file or end of buffer reached */ |
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476 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { |
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477 | endwin(); |
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478 | fprintf(stderr, "\nError moving file pointer in " |
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479 | "get_line().\n"); |
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480 | exit(-1); |
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481 | } |
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482 | if (fpos < file_size) { /* Not end of file yet */ |
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483 | /* We've reached end of buffer, but not end of file yet, |
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484 | so read next part of file into buffer */ |
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485 | if ((bytes_read = |
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486 | read(fd, buf, BUF_SIZE)) == -1) { |
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487 | endwin(); |
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488 | fprintf(stderr, "\nError reading file in get_line().\n"); |
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489 | exit(-1); |
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490 | } |
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491 | buf[bytes_read] = '\0'; |
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492 | page = buf; |
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493 | } else { |
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494 | if (!end_reached) |
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495 | end_reached = 1; |
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496 | break; |
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497 | } |
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498 | } else if (i < MAX_LEN) |
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499 | line[i++] = *(page++); |
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500 | else { |
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501 | /* Truncate lines longer than MAX_LEN characters */ |
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502 | if (i == MAX_LEN) |
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503 | line[i++] = '\0'; |
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504 | page++; |
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505 | } |
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506 | } |
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507 | if (i <= MAX_LEN) |
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508 | line[i] = '\0'; |
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509 | if (!end_reached) |
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510 | page++; /* move pass '\n' */ |
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511 | |
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512 | return line; |
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513 | } |
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514 | |
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515 | /* |
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516 | * Print current position |
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517 | */ |
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518 | static void print_position(WINDOW * win, int height, int width) |
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519 | { |
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520 | int fpos, percent; |
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521 | |
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522 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { |
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523 | endwin(); |
---|
524 | fprintf(stderr, "\nError moving file pointer in print_position().\n"); |
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525 | exit(-1); |
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526 | } |
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527 | wattrset(win, position_indicator_attr); |
---|
528 | wbkgdset(win, position_indicator_attr & A_COLOR); |
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529 | percent = !file_size ? |
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530 | 100 : ((fpos - bytes_read + page - buf) * 100) / file_size; |
---|
531 | wmove(win, height - 3, width - 9); |
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532 | wprintw(win, "(%3d%%)", percent); |
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533 | } |
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