A-M baby

Task/Find-common-directory-path/C/find-common-directory-path-1.c

@@ -0,0 +1,34 @@
+#include <stdio.h>
+
+int common_len(const char *const *names, int n, char sep)
+{
+	int i, pos;
+	for (pos = 0; ; pos++) {
+		for (i = 0; i < n; i++) {
+			if (names[i][pos] != '\0' &&
+					names[i][pos] == names[0][pos])
+				continue;
+
+			/* backtrack */
+			while (pos > 0 && names[0][--pos] != sep);
+			return pos;
+		}
+	}
+
+	return 0;
+}
+
+int main()
+{
+	const char *names[] = {
+		"/home/user1/tmp/coverage/test",
+		"/home/user1/tmp/covert/operator",
+		"/home/user1/tmp/coven/members",
+	};
+	int len = common_len(names, sizeof(names) / sizeof(const char*), '/');
+
+	if (!len) printf("No common path\n");
+	else      printf("Common path: %.*s\n", len, names[0]);
+
+	return 0;
+}

Task/Find-common-directory-path/C/find-common-directory-path-2.c

@@ -0,0 +1 @@
+Common path: /home/user1/tmp