Add version function

This function outputs program name, build date, author(s) and license

2 files changed, 21 insertions, 0 deletions

diff --git a/version.c b/version.c
new file mode 100644
index 0000000..234a9f5
--- /dev/null
+++ b/version.c
@@ -0,0 +1,16 @@
+#include "./version.h"
+#include <stdio.h>
+#include <stdlib.h>
+void version()
+{
+	printf(PROGRAM_NAME
+	       " " PROGRAM_VERSION " (built " BUILD_DATE
+	       " with gcc " GCC_VERSION ")\n"
+	       "Copyright (C) 2026 " PROGRAM_AUTHOR ".\n"
+	       "License GPLv3+: GNU GPL version 3 or later "
+	       "<https://gnu.org/licenses/gpl.html>.\n"
+	       "This is free software: you are free to change and redistribute "
+	       "it.\n"
+	       "There is NO WARRANTY, to the extent permitted by law.\n");
+	exit(EXIT_SUCCESS);
+}
diff --git a/version.h b/version.h
index 64b3b87..b590c33 100644
--- a/version.h
+++ b/version.h
@@ -4,5 +4,10 @@
 #define PROGRAM_NAME "sf"
 #define PROGRAM_LONG_NAME "Status & Files"
 #define PROGRAM_VERSION "0.0.1"
+#define PROGRAM_AUTHOR "Verdant <im@verdant.ee>"
+#define BUILD_DATE __DATE__
+#define GCC_VERSION __VERSION__
+
+void version();
 
 #endif /* SF_VERSION_H */