utils

commit: 1db0ca9fb34b4a196ee7fc8b99abc8e1322a9aa8
parent db2317e7a9b9e67b56458cde2e791dbf62f805c8
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Mon,  5 Apr 2021 06:41:36 +0200

bin/tty: New

Diffstat:
M
bin/Makefile.config
2
+-
A
bin/tty.c
21
+++++++++++++++++++++

2 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/bin/Makefile.config b/bin/Makefile.config
@@ -1,2 +1,2 @@
-EXE = args basename date dirname echo lolcat mdate pwd range sizeof sname xcd
+EXE = args basename date dirname echo lolcat mdate pwd range sizeof sname tty xcd
 MAN1 = basename.1 date.1 dirname.1 lolcat.1 sname.1
diff --git a/bin/tty.c b/bin/tty.c
@@ -0,0 +1,21 @@
+#include <stdio.h> // puts()
+#include <unistd.h> // ttyname(), isatty()
+
+int
+main(void)
+{
+	if(!isatty(STDIN_FILENO)) {
+		puts("not a tty");
+		return 1;
+	}
+
+	char *name = ttyname(STDIN_FILENO);
+	if (!name) {
+		perror("ttyname");
+		return 2;
+	}
+
+	puts(name);
+
+	return 0;
+}