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, 152 insertions, 0 deletions

diff --git a/util/sbase/libutil/mode.c b/util/sbase/libutil/mode.c
new file mode 100644
index 00000000..2754be79
--- /dev/null
+++ b/util/sbase/libutil/mode.c
@@ -0,0 +1,152 @@
+/* See LICENSE file for copyright and license details. */
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "../util.h"
+
+mode_t
+getumask(void)
+{
+	mode_t mask = umask(0);
+	umask(mask);
+	return mask;
+}
+
+mode_t
+parsemode(const char *str, mode_t mode, mode_t mask)
+{
+	char *end;
+	const char *p = str;
+	int octal, op;
+	mode_t who, perm, clear;
+
+	octal = strtol(str, &end, 8);
+	if (*end == '\0') {
+		if (octal < 0 || octal > 07777)
+			eprintf("%s: invalid mode\n", str);
+		return octal;
+	}
+next:
+	/* first, determine which bits we will be modifying */
+	for (who = 0; *p; p++) {
+		switch (*p) {
+		/* masks */
+		case 'u':
+			who |= S_IRWXU|S_ISUID;
+			continue;
+		case 'g':
+			who |= S_IRWXG|S_ISGID;
+			continue;
+		case 'o':
+			who |= S_IRWXO|S_ISVTX;
+			continue;
+		case 'a':
+			who |= S_IRWXU|S_ISUID|S_IRWXG|S_ISGID|S_IRWXO|S_ISVTX;
+			continue;
+		}
+		break;
+	}
+	if (who) {
+		clear = who;
+	} else {
+		clear = S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO;
+		who = ~mask;
+	}
+	while (*p) {
+		switch (*p) {
+		/* opers */
+		case '=':
+		case '+':
+		case '-':
+			op = (int)*p;
+			break;
+		default:
+			eprintf("%s: invalid mode\n", str);
+		}
+
+		perm = 0;
+		switch (*++p) {
+		/* copy */
+		case 'u':
+			if (mode & S_IRUSR)
+				perm |= S_IRUSR|S_IRGRP|S_IROTH;
+			if (mode & S_IWUSR)
+				perm |= S_IWUSR|S_IWGRP|S_IWOTH;
+			if (mode & S_IXUSR)
+				perm |= S_IXUSR|S_IXGRP|S_IXOTH;
+			if (mode & S_ISUID)
+				perm |= S_ISUID|S_ISGID;
+			p++;
+			break;
+		case 'g':
+			if (mode & S_IRGRP)
+				perm |= S_IRUSR|S_IRGRP|S_IROTH;
+			if (mode & S_IWGRP)
+				perm |= S_IWUSR|S_IWGRP|S_IWOTH;
+			if (mode & S_IXGRP)
+				perm |= S_IXUSR|S_IXGRP|S_IXOTH;
+			if (mode & S_ISGID)
+				perm |= S_ISUID|S_ISGID;
+			p++;
+			break;
+		case 'o':
+			if (mode & S_IROTH)
+				perm |= S_IRUSR|S_IRGRP|S_IROTH;
+			if (mode & S_IWOTH)
+				perm |= S_IWUSR|S_IWGRP|S_IWOTH;
+			if (mode & S_IXOTH)
+				perm |= S_IXUSR|S_IXGRP|S_IXOTH;
+			p++;
+			break;
+		default:
+			for (; *p; p++) {
+				switch (*p) {
+				/* modes */
+				case 'r':
+					perm |= S_IRUSR|S_IRGRP|S_IROTH;
+					break;
+				case 'w':
+					perm |= S_IWUSR|S_IWGRP|S_IWOTH;
+					break;
+				case 'x':
+					perm |= S_IXUSR|S_IXGRP|S_IXOTH;
+					break;
+				case 'X':
+					if (S_ISDIR(mode) || mode & (S_IXUSR|S_IXGRP|S_IXOTH))
+						perm |= S_IXUSR|S_IXGRP|S_IXOTH;
+					break;
+				case 's':
+					perm |= S_ISUID|S_ISGID;
+					break;
+				case 't':
+					perm |= S_ISVTX;
+					break;
+				default:
+					goto apply;
+				}
+			}
+		}
+
+apply:
+		/* apply */
+		switch (op) {
+		case '=':
+			mode &= ~clear;
+			/* fallthrough */
+		case '+':
+			mode |= perm & who;
+			break;
+		case '-':
+			mode &= ~(perm & who);
+			break;
+		}
+		/* if we hit a comma, move on to the next clause */
+		if (*p == ',') {
+			p++;
+			goto next;
+		}
+	}
+	return mode & ~S_IFMT;
+}