From e22821799be6c0a27bc26d9e7521b301cb7e7272 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Thu, 23 May 2024 15:05:22 +0300
Subject: [PATCH] LibC: Implement getlogin()

---
 libc/include/limits.h |  1 +
 libc/unistd.cpp       | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/libc/include/limits.h b/libc/include/limits.h
index 4df636d5..05a634ab 100644
--- a/libc/include/limits.h
+++ b/libc/include/limits.h
@@ -59,6 +59,7 @@ __BEGIN_DECLS
 
 #define OPEN_MAX 64
 #define NAME_MAX 255
+#define LOGIN_NAME_MAX 256
 
 __END_DECLS
 
diff --git a/libc/unistd.cpp b/libc/unistd.cpp
index bec5435e..689a19c0 100644
--- a/libc/unistd.cpp
+++ b/libc/unistd.cpp
@@ -1,6 +1,7 @@
 #include <BAN/Assert.h>
 #include <kernel/Syscall.h>
 #include <errno.h>
+#include <pwd.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -465,3 +466,15 @@ int tcsetpgrp(int fildes, pid_t pgid_id)
 {
 	return syscall(SYS_TCSETPGRP, fildes, pgid_id);
 }
+
+char* getlogin(void)
+{
+	static char buffer[LOGIN_NAME_MAX];
+	auto* pw = getpwuid(geteuid());
+	if (pw == nullptr)
+		return nullptr;
+	strncpy(buffer, pw->pw_name, LOGIN_NAME_MAX - 1);
+	buffer[LOGIN_NAME_MAX - 1] = '\0';
+	endpwent();
+	return buffer;
+}