mkdir: Add -p option

userspace/programs/mkdir/main.cpp

@@ -1,23 +1,55 @@
+#include <limits.h>
+#include <errno.h>
 #include <stdio.h>
+#include <string.h>
 #include <sys/stat.h>
 
-int main(int argc, char** argv)
+int create_directory(const char* path, bool create_parents)
 {
-	if (argc <= 1)
+	const size_t pathlen = strlen(path);
+	if (pathlen == 0 || pathlen >= PATH_MAX)
 	{
-		fprintf(stderr, "Missing operand\n");
+		fprintf(stderr, "mkdir: %s\n", strerror(ENOENT));
 		return 1;
 	}
 
-	int ret = 0;
-	for (int i = 1; i < argc; i++)
+	if (!create_parents)
 	{
-		if (mkdir(argv[i], 0755) == -1)
-		{
+		const int ret = mkdir(path, 0755);
+		if (ret == -1)
 			perror("mkdir");
-			ret = 1;
-		}
+		return -ret;
+	}
+
+	int ret = 0;
+	char buffer[PATH_MAX];
+	for (size_t i = 0; path[i];)
+	{
+		for (; path[i] && path[i] != '/'; i++)
+			buffer[i] = path[i];
+		for (; path[i] && path[i] == '/'; i++)
+			buffer[i] = path[i];
+		buffer[i] = '\0';
+		ret = mkdir(buffer, 0755);
 	}
 
 	return ret;
 }
+
+int main(int argc, char** argv)
+{
+	const bool create_parents = argc >= 2 && strcmp(argv[1], "-p") == 0;
+
+	if (argc <= 1 + create_parents)
+	{
+		fprintf(stderr, "missing operand\n");
+		return 1;
+	}
+
+	int ret = 0;
+	for (int i = 1 + create_parents; i < argc; i++)
+		if (create_directory(argv[i], create_parents) == -1)
+			ret = 1;
+
+	return ret;
+}