1 files changed, 94 insertions, 0 deletions
diff --git a/libblkid/ttyutils.c b/libblkid/ttyutils.c
new file mode 100644
index 000000000..3b5a68cd8
--- /dev/null
+++ b/libblkid/ttyutils.c
@@ -0,0 +1,94 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Written by Karel Zak <kzak@redhat.com>
+ */
+#include <ctype.h>
+
+#include "c.h"
+#include "ttyutils.h"
+
+int get_terminal_width(void)
+{
+#ifdef TIOCGSIZE
+	struct ttysize	t_win;
+#endif
+#ifdef TIOCGWINSZ
+	struct winsize	w_win;
+#endif
+        const char	*cp;
+
+#ifdef TIOCGSIZE
+	if (ioctl (0, TIOCGSIZE, &t_win) == 0)
+		return t_win.ts_cols;
+#endif
+#ifdef TIOCGWINSZ
+	if (ioctl (0, TIOCGWINSZ, &w_win) == 0)
+		return w_win.ws_col;
+#endif
+        cp = getenv("COLUMNS");
+	if (cp) {
+		char *end = NULL;
+		long c;
+
+		errno = 0;
+		c = strtol(cp, &end, 10);
+
+		if (errno == 0 && end && *end == '\0' && end > cp &&
+		    c > 0 && c <= INT_MAX)
+			return c;
+	}
+	return 0;
+}
+
+int get_terminal_name(const char **path,
+		      const char **name,
+		      const char **number)
+{
+	const char *tty;
+	const char *p;
+
+	if (name)
+		*name = NULL;
+	if (path)
+		*path = NULL;
+	if (number)
+		*number = NULL;
+
+	tty = ttyname(STDERR_FILENO);
+	if (!tty)
+		return -1;
+	if (path)
+		*path = tty;
+	tty = strncmp(tty, "/dev/", 5) == 0 ? tty + 5 : tty;
+	if (name)
+		*name = tty;
+	if (number) {
+		for (p = tty; p && *p; p++) {
+			if (isdigit(*p)) {
+				*number = p;
+				break;
+			}
+		}
+	}
+	return 0;
+}
+
+
+#ifdef TEST_PROGRAM
+# include <stdlib.h>
+int main(void)
+{
+	const char *path, *name, *num;
+
+	if (get_terminal_name(&path, &name, &num) == 0) {
+		fprintf(stderr, "tty path:   %s\n", path);
+		fprintf(stderr, "tty name:   %s\n", name);
+		fprintf(stderr, "tty number: %s\n", num);
+	}
+	fprintf(stderr,         "tty width:  %d\n", get_terminal_width());
+
+	return EXIT_SUCCESS;
+}
+#endif