diff options
Diffstat (limited to 'src/tty.c')
| -rw-r--r-- | src/tty.c | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/src/tty.c b/src/tty.c new file mode 100644 index 0000000..adee8bf --- /dev/null +++ b/src/tty.c @@ -0,0 +1,215 @@ +/* + * testtty.c: + * + * Copyright (c) 2008 James McKenzie <james@fishsoup.dhs.org>, + * All rights reserved. + * + */ + +static char rcsid[] = "$Id$"; + +/* + * $Log$ + * Revision 1.1 2008/02/07 01:02:52 james + * *** empty log message *** + * + * Revision 1.3 2008/02/06 17:53:28 james + * *** empty log message *** + * + * Revision 1.2 2008/02/04 02:05:06 james + * *** empty log message *** + * + * Revision 1.1 2008/02/04 01:32:39 james + * *** empty log message *** + * + */ + +#include "project.h" + +static void +set_nonblocking (int fd) +{ + long arg; + arg = fcntl (fd, F_GETFL, arg); + arg |= O_NONBLOCK; + fcntl (fd, F_SETFL, arg); +} + +static void +set_blocking (int fd) +{ + long arg; + arg = fcntl (fd, F_GETFL, arg); + arg &= ~O_NONBLOCK; + fcntl (fd, F_SETFL, arg); +} + +static void +default_termios (struct termios *termios) +{ + + memset (termios, 0, sizeof (termios)); + + termios->c_iflag = ICRNL | IXON; + termios->c_oflag = OPOST | ONLCR | NL0 | CR0 | TAB0 | BS0 | VT0 | FF0; + termios->c_lflag = + ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE; + + termios->c_cc[VINTR] = 003; + termios->c_cc[VQUIT] = 034; + termios->c_cc[VERASE] = 0177; + termios->c_cc[VKILL] = 025; + termios->c_cc[VEOF] = 004; + termios->c_cc[VEOL] = 0; + termios->c_cc[VEOL2] = 0; + termios->c_cc[VSTART] = 021; + termios->c_cc[VSTOP] = 023; + termios->c_cc[VSUSP] = 032; + termios->c_cc[VLNEXT] = 026; + termios->c_cc[VWERASE] = 027; + termios->c_cc[VREPRINT] = 022; + termios->c_cc[VDISCARD] = 017; + + termios->c_cflag = CS8 | CREAD | CLOCAL; + + cfsetispeed (termios, B9600); + cfsetospeed (termios, B9600); +} + + +static int +open_fd_to_bash (void) /*thump */ +{ + pid_t child; + int fd; + struct winsize winsize = { 0 }; + struct termios termios; + + default_termios (&termios); + + winsize.ws_row = VT102_ROWS; + winsize.ws_col = VT102_COLS; + + child = forkpty (&fd, NULL, &termios, &winsize); + + switch (child) + { + case -1: /*boo hiss */ + return -1; + case 0: /*waaah */ + setenv ("TERM", "vt102", 1); + execl ("/bin/sh", "-", (char *) 0); + _exit (-1); + } + + return fd; +} + + +TTY * +tty_new_test (void) +{ + TTY *t; + t = (TTY *) malloc (sizeof (TTY)); + t->fd = open_fd_to_bash (); + + set_nonblocking (t->fd); + + return t; +} + +static int +wrap_read (int fd, void *buf, int len) +{ + int red; + + red = read (fd, buf, len); + if (!red) + return -1; + + if ((red < 0) && (errno == EAGAIN)) + red = 0; + + return red; +} + +static int +wrap_write (int fd, void *buf, int len) +{ + int writ; + + writ = write (fd, buf, len); + if (!writ) + return -1; + + if ((writ < 0) && (errno == -EAGAIN)) + writ = 0; + + return writ; +} + +int +tty_read (TTY * t, void *buf, int len) +{ + int red, done = 0; + + + do + { + + red = wrap_read (t->fd, buf, len); + if (red < 0) + return -1; + if (!red) + return done; + + buf += red; + len -= red; + done += red; + } + while (len); + + + return done; +} + + +int +tty_write (TTY * t, void *buf, int len) +{ + int writ, done = 0; + +#if 0 + { + int i; + uint8_t *p = buf; + for (i = 0; i < len; ++i) + fprintf (stderr, "vw: %03o %c\n", p[i], p[i] > 31 ? p[i] : 32); + } +#endif + + do + { + + writ = wrap_write (t->fd, buf, len); + if (writ < 0) + return -1; + if (!writ) + sleep (1); + + buf += writ; + len -= writ; + done += writ; + } + while (len); + + + return done; +} + +void +tty_free (TTY * t) +{ + close (t->fd); + free (t); +} |