184 lines
3.1 KiB
C
184 lines
3.1 KiB
C
/* See LICENSE file for license details. */
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <err.h>
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#include <curses.h>
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#include <fcntl.h>
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#include <locale.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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char *currentslidep, **slidefiles; /* the slides */
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int nslides, currentslide, currentslidelen, exitstatus = 1;
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void
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unloadcurrentslide(void)
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{
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if (currentslidep == NULL)
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return;
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if (munmap(currentslidep, currentslidelen) < 0)
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err(1, "munmap: %s", slidefiles[currentslide]);
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}
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void
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cleanup(int sig)
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{
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unloadcurrentslide();
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endwin(); /* restore terminal */
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exit(exitstatus);
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}
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void
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loadcurrentslide(char **argv, int slide)
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{
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struct stat statbuf;
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int fd;
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unloadcurrentslide();
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fd = open(slidefiles[slide], O_RDONLY, 0);
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if (fd < 0)
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err(1, "open: %s", slidefiles[slide]);
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if (fstat(fd, &statbuf) < 0)
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err(1, "fstat: %s", slidefiles[slide]);
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currentslidep = mmap(NULL, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
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if (currentslidep == MAP_FAILED)
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err(1, "mmap");
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currentslidelen = statbuf.st_size;
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close(fd);
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}
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void
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reloadcurrentslide(int sig)
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{
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if (sig == SIGHUP) {
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/* Make ncurses redisplay slide. */
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if (raise(SIGWINCH) < 0)
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err(1, "raise");
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}
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}
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void
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setsignal()
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{
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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sa.sa_handler = cleanup;
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sigaction(SIGINT, &sa, NULL);
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sigaction(SIGQUIT, &sa, NULL);
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sigaction(SIGTERM, &sa, NULL);
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sa.sa_handler = reloadcurrentslide;
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sigaction(SIGHUP, &sa, NULL);
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}
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int
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main(int argc, char *argv[])
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{
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int c;
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if (argc == 1)
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errx(1, "usage: %s file ...", argv[0]);
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slidefiles = ++argv;
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nslides = --argc;
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setsignal();
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setlocale(LC_ALL, "");
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/* start */
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currentslide = 0;
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currentslidep = NULL;
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currentslidelen = 0;
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/* init curses */
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initscr();
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cbreak();
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noecho();
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nonl();
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intrflush(stdscr, FALSE);
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keypad(stdscr, TRUE);
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curs_set(FALSE); /* hide cursor */
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show:
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/* display slide */
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loadcurrentslide(slidefiles, currentslide);
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clear();
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refresh();
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printw("%.*s", currentslidelen, currentslidep);
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again:
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c = getch();
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switch (c) {
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/* powerpoint remote presenter shortcuts */
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case 4: /* ^D, EOT */
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case 27:
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case KEY_F(5):
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/* end presentation */
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case 'q':
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break;
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/* next */
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case 'l':
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case 'j':
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case KEY_RIGHT:
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case KEY_DOWN:
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case KEY_NPAGE:
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if (currentslide < nslides - 1) {
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currentslide++;
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goto show;
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}
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goto again;
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/* prev */
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case ' ':
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case 'h':
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case 'k':
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case KEY_LEFT:
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case KEY_UP:
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case KEY_PPAGE:
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if (currentslide > 0) {
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currentslide--;
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goto show;
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}
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goto again;
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/* shortcut from powerpoint. Needed for remote presenters. */
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case '.':
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/* first */
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case 'u':
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case KEY_BEG:
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case KEY_HOME:
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currentslide = 0;
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goto show;
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/* last */
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case 'i':
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case KEY_END:
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currentslide = nslides - 1;
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goto show;
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/* reload */
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case 'r':
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case 12: /* ^L, redraw */
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case KEY_RESIZE: /* resize / SIGWINCH */
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goto show;
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default:
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/* printf("key pressed = '%d'\n", c); */
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goto again;
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}
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/* unmap mem */
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exitstatus = 0;
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cleanup(0);
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return 0;
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}
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