1217309Snwhitehorn/* 2224014Snwhitehorn * $Id: tailbox.c,v 1.63 2011/06/27 08:19:43 tom Exp $ 3217309Snwhitehorn * 4220749Snwhitehorn * tailbox.c -- implements the tail box 5217309Snwhitehorn * 6220749Snwhitehorn * Copyright 2000-2010,2011 Thomas E. Dickey 7217309Snwhitehorn * 8217309Snwhitehorn * This program is free software; you can redistribute it and/or modify 9217309Snwhitehorn * it under the terms of the GNU Lesser General Public License, version 2.1 10217309Snwhitehorn * as published by the Free Software Foundation. 11217309Snwhitehorn * 12217309Snwhitehorn * This program is distributed in the hope that it will be useful, but 13217309Snwhitehorn * WITHOUT ANY WARRANTY; without even the implied warranty of 14217309Snwhitehorn * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15217309Snwhitehorn * Lesser General Public License for more details. 16217309Snwhitehorn * 17217309Snwhitehorn * You should have received a copy of the GNU Lesser General Public 18217309Snwhitehorn * License along with this program; if not, write to 19217309Snwhitehorn * Free Software Foundation, Inc. 20217309Snwhitehorn * 51 Franklin St., Fifth Floor 21217309Snwhitehorn * Boston, MA 02110, USA. 22217309Snwhitehorn * 23217309Snwhitehorn * An earlier version of this program lists as authors 24217309Snwhitehorn * Pasquale De Marco (demarco_p@abramo.it) 25217309Snwhitehorn */ 26217309Snwhitehorn 27217309Snwhitehorn#include <dialog.h> 28217309Snwhitehorn#include <dlg_keys.h> 29220749Snwhitehorn#include <sys/stat.h> 30217309Snwhitehorn 31217309Snwhitehorntypedef struct { 32217309Snwhitehorn DIALOG_CALLBACK obj; 33217309Snwhitehorn WINDOW *text; 34217309Snwhitehorn const char **buttons; 35217309Snwhitehorn int hscroll; 36217309Snwhitehorn int old_hscroll; 37217309Snwhitehorn char line[MAX_LEN + 1]; 38220749Snwhitehorn off_t last_pos; 39217309Snwhitehorn} MY_OBJ; 40217309Snwhitehorn 41217309Snwhitehorn/* 42217309Snwhitehorn * Return current line of text. 43217309Snwhitehorn */ 44217309Snwhitehornstatic char * 45217309Snwhitehornget_line(MY_OBJ * obj) 46217309Snwhitehorn{ 47217309Snwhitehorn FILE *fp = obj->obj.input; 48217309Snwhitehorn int col = -(obj->hscroll); 49217309Snwhitehorn int j, tmpint, ch; 50217309Snwhitehorn 51217309Snwhitehorn do { 52217309Snwhitehorn if (((ch = getc(fp)) == EOF) && !feof(fp)) 53217309Snwhitehorn dlg_exiterr("Error moving file pointer in get_line()."); 54217309Snwhitehorn else if (!feof(fp) && (ch != '\n')) { 55217309Snwhitehorn if ((ch == TAB) && (dialog_vars.tab_correct)) { 56217309Snwhitehorn tmpint = dialog_state.tab_len 57217309Snwhitehorn - ((col + obj->hscroll) % dialog_state.tab_len); 58217309Snwhitehorn for (j = 0; j < tmpint; j++) { 59217309Snwhitehorn if (col >= 0 && col < MAX_LEN) 60217309Snwhitehorn obj->line[col] = ' '; 61217309Snwhitehorn ++col; 62217309Snwhitehorn } 63217309Snwhitehorn } else { 64217309Snwhitehorn if (col >= 0) 65217309Snwhitehorn obj->line[col] = (char) ch; 66217309Snwhitehorn ++col; 67217309Snwhitehorn } 68217309Snwhitehorn if (col >= MAX_LEN) 69217309Snwhitehorn break; 70217309Snwhitehorn } 71217309Snwhitehorn } while (!feof(fp) && (ch != '\n')); 72217309Snwhitehorn 73217309Snwhitehorn if (col < 0) 74217309Snwhitehorn col = 0; 75217309Snwhitehorn obj->line[col] = '\0'; 76217309Snwhitehorn 77217309Snwhitehorn return obj->line; 78217309Snwhitehorn} 79217309Snwhitehorn 80217309Snwhitehorn/* 81217309Snwhitehorn * Print a new line of text. 82217309Snwhitehorn */ 83217309Snwhitehornstatic void 84217309Snwhitehornprint_line(MY_OBJ * obj, WINDOW *win, int row, int width) 85217309Snwhitehorn{ 86217309Snwhitehorn int i, y, x; 87217309Snwhitehorn char *line = get_line(obj); 88217309Snwhitehorn 89217309Snwhitehorn (void) wmove(win, row, 0); /* move cursor to correct line */ 90217309Snwhitehorn (void) waddch(win, ' '); 91217309Snwhitehorn#ifdef NCURSES_VERSION 92217309Snwhitehorn (void) waddnstr(win, line, MIN((int) strlen(line), width - 2)); 93217309Snwhitehorn#else 94217309Snwhitehorn line[MIN((int) strlen(line), width - 2)] = '\0'; 95217309Snwhitehorn waddstr(win, line); 96217309Snwhitehorn#endif 97217309Snwhitehorn 98217309Snwhitehorn getyx(win, y, x); 99217309Snwhitehorn /* Clear 'residue' of previous line */ 100217309Snwhitehorn for (i = 0; i < width - x; i++) 101217309Snwhitehorn (void) waddch(win, ' '); 102217309Snwhitehorn} 103217309Snwhitehorn 104217309Snwhitehorn/* 105217309Snwhitehorn * Go back 'target' lines in text file. BUFSIZ has to be in 'size_t' range. 106217309Snwhitehorn */ 107217309Snwhitehornstatic void 108217309Snwhitehornlast_lines(MY_OBJ * obj, int target) 109217309Snwhitehorn{ 110217309Snwhitehorn FILE *fp = obj->obj.input; 111220749Snwhitehorn size_t inx; 112217309Snwhitehorn int count = 0; 113217309Snwhitehorn char buf[BUFSIZ + 1]; 114220749Snwhitehorn size_t size_to_read; 115220749Snwhitehorn size_t size_as_read; 116217309Snwhitehorn long offset = 0; 117217309Snwhitehorn long fpos = 0; 118217309Snwhitehorn 119220749Snwhitehorn if (fseek(fp, 0L, SEEK_END) == -1 120217309Snwhitehorn || (fpos = ftell(fp)) < 0) 121217309Snwhitehorn dlg_exiterr("Error moving file pointer in last_lines()."); 122217309Snwhitehorn 123217309Snwhitehorn if (fpos != 0) { 124217309Snwhitehorn ++target; 125217309Snwhitehorn for (;;) { 126217309Snwhitehorn if (fpos >= BUFSIZ) { 127217309Snwhitehorn size_to_read = BUFSIZ; 128217309Snwhitehorn } else { 129220749Snwhitehorn size_to_read = (size_t) fpos; 130217309Snwhitehorn } 131220749Snwhitehorn fpos = fpos - (long) size_to_read; 132217309Snwhitehorn if (fseek(fp, fpos, SEEK_SET) == -1) 133217309Snwhitehorn dlg_exiterr("Error moving file pointer in last_lines()."); 134220749Snwhitehorn size_as_read = fread(buf, sizeof(char), size_to_read, fp); 135217309Snwhitehorn if (ferror(fp)) 136217309Snwhitehorn dlg_exiterr("Error reading file in last_lines()."); 137217309Snwhitehorn 138220749Snwhitehorn if (size_as_read == 0) { 139220749Snwhitehorn fpos = 0; 140220749Snwhitehorn offset = 0; 141220749Snwhitehorn break; 142220749Snwhitehorn } 143220749Snwhitehorn 144220749Snwhitehorn offset += (long) size_as_read; 145220749Snwhitehorn for (inx = size_as_read - 1; inx != 0; --inx) { 146217309Snwhitehorn if (buf[inx] == '\n') { 147217309Snwhitehorn if (++count > target) 148217309Snwhitehorn break; 149220749Snwhitehorn offset = (long) (inx + 1); 150217309Snwhitehorn } 151217309Snwhitehorn } 152217309Snwhitehorn 153217309Snwhitehorn if (count > target) { 154217309Snwhitehorn break; 155217309Snwhitehorn } else if (fpos == 0) { 156217309Snwhitehorn offset = 0; 157217309Snwhitehorn break; 158217309Snwhitehorn } 159217309Snwhitehorn } 160217309Snwhitehorn 161217309Snwhitehorn if (fseek(fp, fpos + offset, SEEK_SET) == -1) 162217309Snwhitehorn dlg_exiterr("Error moving file pointer in last_lines()."); 163217309Snwhitehorn } 164217309Snwhitehorn} 165217309Snwhitehorn 166217309Snwhitehorn/* 167217309Snwhitehorn * Print a new page of text. 168217309Snwhitehorn */ 169217309Snwhitehornstatic void 170217309Snwhitehornprint_page(MY_OBJ * obj, int height, int width) 171217309Snwhitehorn{ 172217309Snwhitehorn int i; 173217309Snwhitehorn 174217309Snwhitehorn for (i = 0; i < height; i++) { 175217309Snwhitehorn print_line(obj, obj->text, i, width); 176217309Snwhitehorn } 177217309Snwhitehorn (void) wnoutrefresh(obj->text); 178217309Snwhitehorn} 179217309Snwhitehorn 180217309Snwhitehornstatic void 181217309Snwhitehornprint_last_page(MY_OBJ * obj) 182217309Snwhitehorn{ 183217309Snwhitehorn int high = getmaxy(obj->obj.win) - (2 * MARGIN + (obj->obj.bg_task ? 1 : 3)); 184217309Snwhitehorn int wide = getmaxx(obj->text); 185217309Snwhitehorn 186217309Snwhitehorn last_lines(obj, high); 187217309Snwhitehorn print_page(obj, high, wide); 188217309Snwhitehorn} 189217309Snwhitehorn 190217309Snwhitehornstatic void 191217309Snwhitehornrepaint_text(MY_OBJ * obj) 192217309Snwhitehorn{ 193220749Snwhitehorn FILE *fp = obj->obj.input; 194217309Snwhitehorn int cur_y, cur_x; 195217309Snwhitehorn 196217309Snwhitehorn getyx(obj->obj.win, cur_y, cur_x); 197217309Snwhitehorn obj->old_hscroll = obj->hscroll; 198220749Snwhitehorn 199217309Snwhitehorn print_last_page(obj); 200220749Snwhitehorn obj->last_pos = ftell(fp); 201220749Snwhitehorn 202217309Snwhitehorn (void) wmove(obj->obj.win, cur_y, cur_x); /* Restore cursor position */ 203217309Snwhitehorn wrefresh(obj->obj.win); 204217309Snwhitehorn} 205217309Snwhitehorn 206217309Snwhitehornstatic bool 207220749Snwhitehornhandle_input(DIALOG_CALLBACK * cb) 208220749Snwhitehorn{ 209220749Snwhitehorn MY_OBJ *obj = (MY_OBJ *) cb; 210220749Snwhitehorn FILE *fp = obj->obj.input; 211220749Snwhitehorn struct stat sb; 212220749Snwhitehorn 213220749Snwhitehorn if (fstat(fileno(fp), &sb) == 0 214220749Snwhitehorn && sb.st_size != obj->last_pos) { 215220749Snwhitehorn repaint_text(obj); 216220749Snwhitehorn } 217220749Snwhitehorn 218220749Snwhitehorn return TRUE; 219220749Snwhitehorn} 220220749Snwhitehorn 221220749Snwhitehornstatic bool 222217309Snwhitehornhandle_my_getc(DIALOG_CALLBACK * cb, int ch, int fkey, int *result) 223217309Snwhitehorn{ 224217309Snwhitehorn MY_OBJ *obj = (MY_OBJ *) cb; 225217309Snwhitehorn bool done = FALSE; 226217309Snwhitehorn 227217309Snwhitehorn if (!fkey && dlg_char_to_button(ch, obj->buttons) == 0) { 228217309Snwhitehorn ch = DLGK_ENTER; 229217309Snwhitehorn fkey = TRUE; 230217309Snwhitehorn } 231217309Snwhitehorn 232217309Snwhitehorn if (fkey) { 233217309Snwhitehorn switch (ch) { 234217309Snwhitehorn case DLGK_ENTER: 235217309Snwhitehorn *result = DLG_EXIT_OK; 236217309Snwhitehorn done = TRUE; 237217309Snwhitehorn break; 238217309Snwhitehorn case DLGK_BEGIN: /* Beginning of line */ 239217309Snwhitehorn obj->hscroll = 0; 240217309Snwhitehorn break; 241217309Snwhitehorn case DLGK_GRID_LEFT: /* Scroll left */ 242217309Snwhitehorn if (obj->hscroll > 0) { 243217309Snwhitehorn obj->hscroll -= 1; 244217309Snwhitehorn } 245217309Snwhitehorn break; 246217309Snwhitehorn case DLGK_GRID_RIGHT: /* Scroll right */ 247217309Snwhitehorn if (obj->hscroll < MAX_LEN) 248217309Snwhitehorn obj->hscroll += 1; 249217309Snwhitehorn break; 250217309Snwhitehorn default: 251217309Snwhitehorn beep(); 252217309Snwhitehorn break; 253217309Snwhitehorn } 254217309Snwhitehorn if ((obj->hscroll != obj->old_hscroll)) 255217309Snwhitehorn repaint_text(obj); 256217309Snwhitehorn } else { 257217309Snwhitehorn switch (ch) { 258217309Snwhitehorn case ERR: 259217309Snwhitehorn clearerr(cb->input); 260217309Snwhitehorn ch = getc(cb->input); 261217309Snwhitehorn (void) ungetc(ch, cb->input); 262220749Snwhitehorn if (ch != EOF) { 263220749Snwhitehorn handle_input(cb); 264217309Snwhitehorn } 265217309Snwhitehorn break; 266217309Snwhitehorn case ESC: 267217309Snwhitehorn done = TRUE; 268217309Snwhitehorn *result = DLG_EXIT_ESC; 269217309Snwhitehorn break; 270217309Snwhitehorn default: 271217309Snwhitehorn beep(); 272217309Snwhitehorn break; 273217309Snwhitehorn } 274217309Snwhitehorn } 275217309Snwhitehorn 276217309Snwhitehorn return !done; 277217309Snwhitehorn} 278217309Snwhitehorn 279217309Snwhitehorn/* 280217309Snwhitehorn * Display text from a file in a dialog box, like in a "tail -f". 281217309Snwhitehorn */ 282217309Snwhitehornint 283217309Snwhitehorndialog_tailbox(const char *title, const char *file, int height, int width, int bg_task) 284217309Snwhitehorn{ 285217309Snwhitehorn /* *INDENT-OFF* */ 286217309Snwhitehorn static DLG_KEYS_BINDING binding[] = { 287224014Snwhitehorn HELPKEY_BINDINGS, 288217309Snwhitehorn ENTERKEY_BINDINGS, 289217309Snwhitehorn DLG_KEYS_DATA( DLGK_BEGIN, '0' ), 290217309Snwhitehorn DLG_KEYS_DATA( DLGK_BEGIN, KEY_BEG ), 291217309Snwhitehorn DLG_KEYS_DATA( DLGK_GRID_LEFT, 'H' ), 292217309Snwhitehorn DLG_KEYS_DATA( DLGK_GRID_LEFT, 'h' ), 293217309Snwhitehorn DLG_KEYS_DATA( DLGK_GRID_LEFT, KEY_LEFT ), 294217309Snwhitehorn DLG_KEYS_DATA( DLGK_GRID_RIGHT, 'L' ), 295217309Snwhitehorn DLG_KEYS_DATA( DLGK_GRID_RIGHT, 'l' ), 296217309Snwhitehorn DLG_KEYS_DATA( DLGK_GRID_RIGHT, KEY_RIGHT ), 297217309Snwhitehorn END_KEYS_BINDING 298217309Snwhitehorn }; 299217309Snwhitehorn /* *INDENT-ON* */ 300217309Snwhitehorn 301217309Snwhitehorn#ifdef KEY_RESIZE 302217309Snwhitehorn int old_height = height; 303217309Snwhitehorn int old_width = width; 304217309Snwhitehorn#endif 305217309Snwhitehorn int fkey; 306217309Snwhitehorn int x, y, result, thigh; 307217309Snwhitehorn WINDOW *dialog, *text; 308217309Snwhitehorn const char **buttons = 0; 309217309Snwhitehorn MY_OBJ *obj; 310217309Snwhitehorn FILE *fd; 311217309Snwhitehorn int min_width = 12; 312217309Snwhitehorn 313217309Snwhitehorn /* Open input file for reading */ 314217309Snwhitehorn if ((fd = fopen(file, "rb")) == NULL) 315217309Snwhitehorn dlg_exiterr("Can't open input file in dialog_tailbox()."); 316217309Snwhitehorn 317217309Snwhitehorn#ifdef KEY_RESIZE 318217309Snwhitehorn retry: 319217309Snwhitehorn#endif 320217309Snwhitehorn dlg_auto_sizefile(title, file, &height, &width, 2, min_width); 321217309Snwhitehorn dlg_print_size(height, width); 322217309Snwhitehorn dlg_ctl_size(height, width); 323217309Snwhitehorn 324217309Snwhitehorn x = dlg_box_x_ordinate(width); 325217309Snwhitehorn y = dlg_box_y_ordinate(height); 326217309Snwhitehorn thigh = height - ((2 * MARGIN) + (bg_task ? 0 : 2)); 327217309Snwhitehorn 328217309Snwhitehorn dialog = dlg_new_window(height, width, y, x); 329217309Snwhitehorn 330217309Snwhitehorn dlg_mouse_setbase(x, y); 331217309Snwhitehorn 332217309Snwhitehorn /* Create window for text region, used for scrolling text */ 333217309Snwhitehorn text = dlg_sub_window(dialog, 334217309Snwhitehorn thigh, 335217309Snwhitehorn width - (2 * MARGIN), 336217309Snwhitehorn y + MARGIN, 337217309Snwhitehorn x + MARGIN); 338217309Snwhitehorn 339217309Snwhitehorn dlg_draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr); 340217309Snwhitehorn dlg_draw_bottom_box(dialog); 341217309Snwhitehorn dlg_draw_title(dialog, title); 342224014Snwhitehorn dlg_draw_helpline(dialog, FALSE); 343217309Snwhitehorn 344217309Snwhitehorn if (!bg_task) { 345217309Snwhitehorn buttons = dlg_exit_label(); 346217309Snwhitehorn dlg_button_layout(buttons, &min_width); 347217309Snwhitehorn dlg_draw_buttons(dialog, height - (2 * MARGIN), 0, buttons, FALSE, 348217309Snwhitehorn FALSE, width); 349217309Snwhitehorn } 350217309Snwhitehorn 351217309Snwhitehorn (void) wmove(dialog, thigh, (MARGIN + 1)); 352217309Snwhitehorn (void) wnoutrefresh(dialog); 353217309Snwhitehorn 354217309Snwhitehorn obj = dlg_calloc(MY_OBJ, 1); 355217309Snwhitehorn assert_ptr(obj, "dialog_tailbox"); 356217309Snwhitehorn 357217309Snwhitehorn obj->obj.input = fd; 358217309Snwhitehorn obj->obj.win = dialog; 359217309Snwhitehorn obj->obj.handle_getc = handle_my_getc; 360220749Snwhitehorn obj->obj.handle_input = bg_task ? handle_input : 0; 361217309Snwhitehorn obj->obj.keep_bg = bg_task && dialog_vars.cant_kill; 362217309Snwhitehorn obj->obj.bg_task = bg_task; 363217309Snwhitehorn obj->text = text; 364217309Snwhitehorn obj->buttons = buttons; 365217309Snwhitehorn dlg_add_callback(&(obj->obj)); 366217309Snwhitehorn 367217309Snwhitehorn dlg_register_window(dialog, "tailbox", binding); 368217309Snwhitehorn dlg_register_buttons(dialog, "tailbox", buttons); 369217309Snwhitehorn 370217309Snwhitehorn /* Print last page of text */ 371217309Snwhitehorn dlg_attr_clear(text, thigh, getmaxx(text), dialog_attr); 372217309Snwhitehorn repaint_text(obj); 373217309Snwhitehorn 374217309Snwhitehorn if (bg_task) { 375217309Snwhitehorn result = DLG_EXIT_OK; 376217309Snwhitehorn } else { 377217309Snwhitehorn int ch; 378217309Snwhitehorn do { 379217309Snwhitehorn ch = dlg_getc(dialog, &fkey); 380217309Snwhitehorn#ifdef KEY_RESIZE 381217309Snwhitehorn if (fkey && ch == KEY_RESIZE) { 382217309Snwhitehorn /* reset data */ 383217309Snwhitehorn height = old_height; 384217309Snwhitehorn width = old_width; 385217309Snwhitehorn /* repaint */ 386217309Snwhitehorn dlg_clear(); 387217309Snwhitehorn dlg_del_window(dialog); 388217309Snwhitehorn refresh(); 389217309Snwhitehorn dlg_mouse_free_regions(); 390217309Snwhitehorn dlg_button_layout(buttons, &min_width); 391217309Snwhitehorn goto retry; 392217309Snwhitehorn } 393217309Snwhitehorn#endif 394217309Snwhitehorn } 395217309Snwhitehorn while (handle_my_getc(&(obj->obj), ch, fkey, &result)); 396217309Snwhitehorn } 397217309Snwhitehorn dlg_mouse_free_regions(); 398217309Snwhitehorn return result; 399217309Snwhitehorn} 400