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, 108 insertions, 0 deletions

diff --git a/util/sbase/libutil/recurse.c b/util/sbase/libutil/recurse.c
new file mode 100644
index 00000000..e66efaf5
--- /dev/null
+++ b/util/sbase/libutil/recurse.c
@@ -0,0 +1,108 @@
+/* See LICENSE file for copyright and license details. */
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "../fs.h"
+#include "../util.h"
+
+int recurse_status = 0;
+
+void
+recurse(int dirfd, const char *name, void *data, struct recursor *r)
+{
+	struct dirent *d;
+	struct history *new, *h;
+	struct stat st, dst;
+	DIR *dp;
+	int flags = 0, fd;
+	size_t pathlen = r->pathlen;
+
+	if (dirfd == AT_FDCWD)
+		pathlen = estrlcpy(r->path, name, sizeof(r->path));
+
+	if (r->follow == 'P' || (r->follow == 'H' && r->depth))
+		flags |= AT_SYMLINK_NOFOLLOW;
+
+	if (fstatat(dirfd, name, &st, flags) < 0) {
+		if (!(r->flags & SILENT)) {
+			weprintf("stat %s:", r->path);
+			recurse_status = 1;
+		}
+		return;
+	}
+	if (!S_ISDIR(st.st_mode)) {
+		r->fn(dirfd, name, &st, data, r);
+		return;
+	}
+
+	new = emalloc(sizeof(struct history));
+	new->prev  = r->hist;
+	r->hist    = new;
+	new->dev   = st.st_dev;
+	new->ino   = st.st_ino;
+
+	for (h = new->prev; h; h = h->prev)
+		if (h->ino == st.st_ino && h->dev == st.st_dev)
+			return;
+
+	if (!r->depth && (r->flags & DIRFIRST))
+		r->fn(dirfd, name, &st, data, r);
+
+	if (!r->maxdepth || r->depth + 1 < r->maxdepth) {
+		fd = openat(dirfd, name, O_RDONLY | O_CLOEXEC | O_DIRECTORY);
+		if (fd < 0) {
+			weprintf("open %s:", r->path);
+			recurse_status = 1;
+		}
+		if (!(dp = fdopendir(fd))) {
+			if (!(r->flags & SILENT)) {
+				weprintf("fdopendir:");
+				recurse_status = 1;
+			}
+			return;
+		}
+		if (r->path[pathlen - 1] != '/')
+			r->path[pathlen++] = '/';
+		if (r->follow == 'H')
+			flags |= AT_SYMLINK_NOFOLLOW;
+		while ((d = readdir(dp))) {
+			if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
+				continue;
+			r->pathlen = pathlen + estrlcpy(r->path + pathlen, d->d_name, sizeof(r->path) - pathlen);
+			if (fstatat(fd, d->d_name, &dst, flags) < 0) {
+				if (!(r->flags & SILENT)) {
+					weprintf("stat %s:", r->path);
+					recurse_status = 1;
+				}
+			} else if ((r->flags & SAMEDEV) && dst.st_dev != st.st_dev) {
+				continue;
+			} else {
+				r->depth++;
+				r->fn(fd, d->d_name, &dst, data, r);
+				r->depth--;
+			}
+		}
+		r->path[pathlen - 1] = '\0';
+		r->pathlen = pathlen - 1;
+		closedir(dp);
+	}
+
+	if (!r->depth) {
+		if (!(r->flags & DIRFIRST))
+			r->fn(dirfd, name, &st, data, r);
+
+		while (r->hist) {
+			h = r->hist;
+			r->hist = r->hist->prev;
+			free(h);
+		}
+	}
+}