config/git: import suckless sbase

i currently use the output of sha512sum in several
places of xbmk, which is a bit unreliable in case
output changes.

other cases where i use util outputs in variables
are probably reliable, because i'm using mostly
posix utilities in those.

to mitigate this, i now import suckless sbase, which
has a reasonable sha512sum implementation.

*every* binary it builds is being placed in build.list,
because i'll probably start using more of them.

for example, i may start modifying the "date"
implementation, adding the GNU-specific options that
i need as mentioned on init.sh

i'm importing it in util/ because the sha512sum
util is needed for verifying project sources, so
if sbase itself is a "project source", that means
we can into a chicken and egg bootstrapping problem.

this is sbase at revision:
055cc1ae1b3a13c3d8f25af0a4a3316590efcd48

Signed-off-by: Leah Rowe <leah@libreboot.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/util/sbase/tty.c b/util/sbase/tty.c
new file mode 100644
index 00000000..65151287
--- /dev/null
+++ b/util/sbase/tty.c
@@ -0,0 +1,31 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdio.h>
+#include <unistd.h>
+
+#include "util.h"
+
+static void
+usage(void)
+{
+	enprintf(2, "usage: %s\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	char *tty;
+
+	ARGBEGIN {
+	default:
+		usage();
+	} ARGEND
+
+	if (argc)
+		usage();
+
+	tty = ttyname(STDIN_FILENO);
+	puts(tty ? tty : "not a tty");
+
+	enfshut(2, stdout, "<stdout>");
+	return !tty;
+}