permconv

commit a0a625d2e653984ddbe60d28a74e357fe818f0a0
Author: Friedel Schön <[email protected]>
Date:   Sat,  7 Sep 2024 18:06:28 +0200

first commit

Diffstat:
A
permconv
 | 
0

A
permconv.c
 | 
45
+++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 45 insertions(+), 0 deletions(-)
diff --git a/permconv b/permconv
Binary files differ.
diff --git a/permconv.c b/permconv.c
@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void from_oct(int permission, char *result) {
+	sprintf(result, "%c%c%c%c%c%c%c%c%c", (permission & 0400) ? 'r' : '-',
+			(permission & 0200) ? 'w' : '-', (permission & 0100) ? 'x' : '-',
+			(permission & 0040) ? 'r' : '-', (permission & 0020) ? 'w' : '-',
+			(permission & 0010) ? 'x' : '-', (permission & 0004) ? 'r' : '-',
+			(permission & 0002) ? 'w' : '-', (permission & 0001) ? 'x' : '-');
+}
+
+int to_oct(const char *permission) {
+	int result = 0;
+	for (int i = 0; i < 9; i++) {
+		if (permission[i] != '-') {
+			result |= 1 << (8 - i);
+		}
+	}
+	return result;
+}
+
+int main(int argc, char *argv[]) {
+	if (argc != 2) {
+		printf("Usage: %s <permission>\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	char *permission = argv[1];
+	int	  numericPermission;
+
+	// Check if input is numeric or symbolic
+	if (permission[0] >= '0' && permission[0] <= '7') {
+		// Numeric input
+		numericPermission = strtol(permission, NULL, 8);
+		from_oct(numericPermission, permission);
+		printf("%s\n", permission);
+	} else {
+		// Symbolic input
+		numericPermission = to_oct(permission);
+		printf("%o\n", numericPermission);
+	}
+
+	return EXIT_SUCCESS;
+}