From 03ab6cf26e48ba39f981e2076903d1dad55844bf Mon Sep 17 00:00:00 2001
From: Jonas 'Sortie' Termansen <sortie@maxsi.org>
Date: Sun, 6 Jan 2013 21:38:05 +0100
Subject: [PATCH] Add program_invocation_short_name(3).

---
 libc/include/errno.h |  1 +
 libc/init.cpp        | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/libc/include/errno.h b/libc/include/errno.h
index 85faed24..25958b98 100644
--- a/libc/include/errno.h
+++ b/libc/include/errno.h
@@ -33,6 +33,7 @@ __BEGIN_DECLS
 @include(errno_values.h)
 
 extern char* program_invocation_name;
+extern char* program_invocation_short_name;
 
 __END_DECLS
 
diff --git a/libc/init.cpp b/libc/init.cpp
index 66a41f63..a8ac106d 100644
--- a/libc/init.cpp
+++ b/libc/init.cpp
@@ -28,15 +28,26 @@
 
 extern "C" { char program_invocation_name_data[256] = ""; }
 extern "C" { char* program_invocation_name = program_invocation_name_data; }
+extern "C" { char* program_invocation_short_name; }
 
 extern "C" void init_error_functions();
 extern "C" void init_stdio();
 extern "C" void init_signal();
 
+static char* find_last_elem(char* str)
+{
+	size_t len = strlen(str);
+	for ( size_t i = len; i; i-- )
+		if ( str[i-1] == '/' )
+			return str + i;
+	return str;
+}
+
 extern "C" void initialize_standard_library(int argc, char* argv[])
 {
 	if ( argc )
 		strcpy(program_invocation_name, argv[0]);
+	program_invocation_short_name =  find_last_elem(program_invocation_name);
 
 	// Initialize stuff such as errno.
 	init_error_functions();