moved terminal stuff to their own file

[visor] / visor / src / term.c

diff --git a/visor/src/term.c b/visor/src/term.c
new file mode 100644 (file)
index 0000000..5a167a6
--- /dev/null
+++ b/visor/src/term.c
@@ -0,0 +1,88 @@
+#include <stdio.h>
+#include <signal.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+#include "term.h"
+
+static void sighandler(int s);
+
+static int term_width, term_height;
+static int ttyfd = -1;
+static struct termios saved_term;
+
+
+int term_init(const char *ttypath)
+{
+       struct termios term;
+       struct winsize winsz;
+
+       if((ttyfd = open("/dev/tty", O_RDWR)) == -1) {
+               perror("failed to open /dev/tty");
+               return -1;
+       }
+       if(tcgetattr(ttyfd, &term) == -1) {
+               perror("failed to get terminal attr");
+               return -1;
+       }
+       saved_term = term;
+       term.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
+       term.c_oflag &= ~OPOST;
+       term.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
+       term.c_cflag = (term.c_cflag & ~(CSIZE | PARENB)) | CS8;
+
+       if(tcsetattr(ttyfd, TCSAFLUSH, &term) == -1) {
+               perror("failed to change terminal attributes");
+               return -1;
+       }
+
+       ioctl(1, TIOCGWINSZ, &winsz);
+       term_width = winsz.ws_col;
+       term_height = winsz.ws_row;
+
+       signal(SIGWINCH, sighandler);
+       return 0;
+}
+
+void term_cleanup(void)
+{
+       tcsetattr(ttyfd, TCSAFLUSH, &saved_term);
+       close(ttyfd);
+       ttyfd = -1;
+}
+
+void term_clear(void)
+{
+       write(ttyfd, "\033[2J", 4);
+}
+
+int term_getchar(void)
+{
+       int res;
+       char c;
+       while((res = read(ttyfd, &c, 1)) < 0 && errno == EINTR);
+       if(res <= 0) return -1;
+       return c;
+}
+
+
+static void sighandler(int s)
+{
+       struct winsize winsz;
+
+       signal(s, sighandler);
+
+       switch(s) {
+       case SIGWINCH:
+               ioctl(1, TIOCGWINSZ, &winsz);
+               term_width = winsz.ws_col;
+               term_height = winsz.ws_row;
+               /* redraw */
+               break;
+
+       default:
+               break;
+       }
+}