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>

util/sbase/libutil/enmasse.c

@@ -0,0 +1,38 @@
+/* See LICENSE file for copyright and license details. */
+#include <libgen.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "../util.h"
+
+void
+enmasse(int argc, char *argv[], int (*fn)(const char *, const char *, int))
+{
+	struct stat st;
+	char buf[PATH_MAX], *dir;
+	int i, len;
+	size_t dlen;
+
+	if (argc == 2 && !(stat(argv[1], &st) == 0 && S_ISDIR(st.st_mode))) {
+		fnck(argv[0], argv[1], fn, 0);
+		return;
+	} else {
+		dir = (argc == 1) ? "." : argv[--argc];
+	}
+
+	for (i = 0; i < argc; i++) {
+		dlen = strlen(dir);
+		if (dlen > 0 && dir[dlen - 1] == '/')
+			len = snprintf(buf, sizeof(buf), "%s%s", dir, basename(argv[i]));
+		else
+			len = snprintf(buf, sizeof(buf), "%s/%s", dir, basename(argv[i]));
+		if (len < 0 || len >= sizeof(buf)) {
+			eprintf("%s/%s: filename too long\n", dir,
+			        basename(argv[i]));
+		}
+		fnck(argv[i], buf, fn, 0);
+	}
+}