init commit

3sem/cnts/contest5/02.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
+enum
+{
+    MAX_MODE = 0777,
+};
+
+int
+main(int argc, char *argv[])
+{
+    const char s[] = "rwxrwxrwx";
+
+    for (int i = 1; i < argc; ++i) {
+        char *p;
+        errno = 0;
+        int n = strtol(argv[i], &p, 8);
+
+        if (errno || *p || p == argv[i] || n > MAX_MODE || n < 0) {
+            return 1;
+        }
+
+        for (int j = 0; j < sizeof(s) - 1; ++j) {
+            putchar((n & (1 << (sizeof(s) - 2 - j))) ? s[j] : '-');
+        }
+
+        printf("\n");
+    }
+
+    return 0;
+}