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, 60 insertions, 0 deletions

diff --git a/util/sbase/tee.c b/util/sbase/tee.c
new file mode 100644
index 00000000..eac106ca
--- /dev/null
+++ b/util/sbase/tee.c
@@ -0,0 +1,60 @@
+/* See LICENSE file for copyright and license details. */
+#include <fcntl.h>
+#include <signal.h>
+#include <unistd.h>
+
+#include "util.h"
+
+static void
+usage(void)
+{
+	eprintf("usage: %s [-ai] [file ...]\n", argv0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int *fds = NULL;
+	size_t i, nfds;
+	ssize_t n;
+	int ret = 0, aflag = O_TRUNC, iflag = 0;
+	char buf[BUFSIZ];
+
+	ARGBEGIN {
+	case 'a':
+		aflag = O_APPEND;
+		break;
+	case 'i':
+		iflag = 1;
+		break;
+	default:
+		usage();
+	} ARGEND
+
+	if (iflag && signal(SIGINT, SIG_IGN) == SIG_ERR)
+		eprintf("signal:");
+	nfds = argc + 1;
+	fds = ecalloc(nfds, sizeof(*fds));
+
+	for (i = 0; i < argc; i++) {
+		if ((fds[i] = open(argv[i], O_WRONLY|O_CREAT|aflag, 0666)) < 0) {
+			weprintf("open %s:", argv[i]);
+			ret = 1;
+		}
+	}
+	fds[i] = 1;
+
+	while ((n = read(0, buf, sizeof(buf))) > 0) {
+		for (i = 0; i < nfds; i++) {
+			if (fds[i] >= 0 && writeall(fds[i], buf, n) < 0) {
+				weprintf("write %s:", (i != argc) ? argv[i] : "<stdout>");
+				fds[i] = -1;
+				ret = 1;
+			}
+		}
+	}
+	if (n < 0)
+		eprintf("read <stdin>:");
+
+	return ret;
+}