From ae4f4e73edbf7955e1c9153e4c0b1e697e10e05f Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Thu, 2 Nov 2023 12:08:06 +0300
Subject: [PATCH] fix

---
 libmu/parse_mode.h | 54 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 53 insertions(+), 1 deletion(-)

diff --git a/libmu/parse_mode.h b/libmu/parse_mode.h
index 77b3a2f..c1a5628 100644
--- a/libmu/parse_mode.h
+++ b/libmu/parse_mode.h
@@ -20,7 +20,59 @@ mode_t mu_parse_mode(const char *s) {
 	if (!*p && mode < 07777U)
 		return mode;
 
-	return -1;
+	mode = 0;
+
+	/* 0 - + */
+	int type = 0;
+	mode_t mask = 0;
+
+	for (size_t i = 0; i < strlen(s); i++) {
+		switch (s[i]) {
+			case 'r':
+				mode |= A(RD_PERM);
+				break;
+
+			case 'w':
+				mode |= A(WR_PERM);
+				break;
+
+			case 'x':
+				mode |= A(EX_PERM);
+				break;
+
+			case '+':
+				type = 0;
+				break;
+
+			case '-':
+				type = 1;
+				break;
+
+			case 'g':
+				mask |= G(FULL_PERM);
+				break;
+
+			case 'u':
+				mask |= U(FULL_PERM);
+				break;
+
+			case 'o':
+				mask |= O(FULL_PERM);
+				break;
+
+			case 'a':
+				mask |= A(FULL_PERM);
+				break;
+
+			default:
+				return -1;
+		}
+	}
+
+	if (type)
+		return ~mask & mode;
+
+	return mask & mode;
 }
 
 #endif