From 5f97c77a276414eb0aa473ef6ddf0d4cc89531af Mon Sep 17 00:00:00 2001
From: Alan Potteiger <alanpotteiger@gmail.com>
Date: Wed, 23 Nov 2022 00:18:18 +0100
Subject: [PATCH] `logname`

---
 Makefile  |  2 +-
 README    |  1 +
 logname.c | 28 ++++++++++++++++++++++++++++
 3 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 logname.c

diff --git a/Makefile b/Makefile
index 9f6ce45..61ac29f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-BIN=cat pwd sleep tty
+BIN=cat logname pwd sleep tty
 CFLAGS=-std=c99
 all: $(BIN)
 clean:
diff --git a/README b/README
index 05966b6..497ed4f 100644
--- a/README
+++ b/README
@@ -11,6 +11,7 @@ Utilities
 ---------
 
 - cat
+- logname
 - pwd
 - sleep
 - tty
diff --git a/logname.c b/logname.c
new file mode 100644
index 0000000..ac9c252
--- /dev/null
+++ b/logname.c
@@ -0,0 +1,28 @@
+/* `logname.c` - return the user's login name
+   Copyright (c) 2022, Alan Potteiger
+   See `LICENSE` for copyright and license details */
+
+#define _POSIX_C_SOURCE 200809L
+
+#include <stdio.h>
+#include <unistd.h>
+
+static const char *usage = {
+	"usage: logname\n"
+};
+
+int
+main(int argc, char *argv[])
+{
+	char *name;
+
+	name = getlogin();
+	if (name == NULL) {
+		fputs("logname: login name not set\n", stderr);
+		return 1;
+	}
+
+	puts(name);
+	return 0;
+}
+
-- 
2.11.4.GIT