Add tty line support

Not always is desirable to create a pseudo terminal, and some times
we want to open a terminal emulator over a tty line. With this new
patch is possible to do someting like:

	$ st -l /dev/ttyS0 115200

Without this option was needed to launch another terminal emulator
over st (for example minicom, picocom, cu, ...).

1 files changed, 54 insertions, 12 deletions

diff --git a/st.c b/st.c
index bb8c365..d22c605 100644
--- a/st.c
+++ b/st.c
@@ -352,6 +352,7 @@ static void draw(void);
 static void redraw(void);
 static void drawregion(int, int, int, int);
 static void execsh(void);
+static void stty(void);
 static void sigchld(int);
 static void run(void);
 
@@ -508,6 +509,7 @@ static char *opt_title = NULL;
 static char *opt_embed = NULL;
 static char *opt_class = NULL;
 static char *opt_font = NULL;
+static char *opt_line = NULL;
 static int oldbutton = 3; /* button event on startup: 3 = release */
 
 static char *usedfont = NULL;
@@ -1253,11 +1255,55 @@ sigchld(int a) {
 	exit(EXIT_SUCCESS);
 }
 
+
+void
+stty(void)
+{
+	char cmd[_POSIX_ARG_MAX], **p, *q, *s;
+	size_t n, siz;
+
+	if((n = strlen(stty_args)) > sizeof(cmd)-1)
+		die("incorrect stty parameters\n");
+	memcpy(cmd, stty_args, n);
+	q = cmd + n;
+	siz = sizeof(cmd) - n;
+	for(p = opt_cmd; p && (s = *p); ++p) {
+		if((n = strlen(s)) > siz-1)
+			die("stty parameter length too long\n");
+		*q++ = ' ';
+		q = memcpy(q, s, n);
+		q += n;
+		siz-= n + 1;
+	}
+	*q = '\0';
+	system(cmd);
+}
+
 void
 ttynew(void) {
 	int m, s;
 	struct winsize w = {term.row, term.col, 0, 0};
 
+	if(opt_io) {
+		term.mode |= MODE_PRINT;
+		iofd = (!strcmp(opt_io, "-")) ?
+			  STDOUT_FILENO :
+			  open(opt_io, O_WRONLY | O_CREAT, 0666);
+		if(iofd < 0) {
+			fprintf(stderr, "Error opening %s:%s\n",
+				opt_io, strerror(errno));
+		}
+	}
+
+	if (opt_line) {
+		if((cmdfd = open(opt_line, O_RDWR)) < 0)
+			die("open line failed: %s\n", strerror(errno));
+		close(STDIN_FILENO);
+		dup(cmdfd);
+		stty();
+		return;
+	}
+
 	/* seems to work fine on linux, openbsd and freebsd */
 	if(openpty(&m, &s, NULL, NULL, &w) < 0)
 		die("openpty failed: %s\n", strerror(errno));
@@ -1267,6 +1313,7 @@ ttynew(void) {
 		die("fork failed\n");
 		break;
 	case 0:
+		close(iofd);
 		setsid(); /* create a new process group */
 		dup2(s, STDIN_FILENO);
 		dup2(s, STDOUT_FILENO);
@@ -1281,16 +1328,6 @@ ttynew(void) {
 		close(s);
 		cmdfd = m;
 		signal(SIGCHLD, sigchld);
-		if(opt_io) {
-			term.mode |= MODE_PRINT;
-			iofd = (!strcmp(opt_io, "-")) ?
-				  STDOUT_FILENO :
-				  open(opt_io, O_WRONLY | O_CREAT, 0666);
-			if(iofd < 0) {
-				fprintf(stderr, "Error opening %s:%s\n",
-					opt_io, strerror(errno));
-			}
-		}
 		break;
 	}
 }
@@ -4009,9 +4046,11 @@ run(void) {
 
 void
 usage(void) {
-	die("%s " VERSION " (c) 2010-2015 st engineers\n" \
+	die("%s " VERSION " (c) 2010-2015 st engineers\n"
 	"usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
-	"          [-i] [-t title] [-w windowid] [-e command ...] [command ...]\n",
+	"          [-i] [-t title] [-w windowid] [-e command ...] [command ...]\n"
+	"       st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
+	"          [-i] [-t title] [-w windowid] [-l line] [stty_args ...]\n",
 	argv0);
 }
 
@@ -4047,6 +4086,9 @@ main(int argc, char *argv[]) {
 	case 'o':
 		opt_io = EARGF(usage());
 		break;
+	case 'l':
+		opt_line = EARGF(usage());
+		break;
 	case 't':
 		opt_title = EARGF(usage());
 		break;