1 files changed, 39 insertions, 0 deletions
diff --git a/unix/utils/make_dir_path.c b/unix/utils/make_dir_path.c
new file mode 100644
index 00000000..4d212fe4
--- /dev/null
+++ b/unix/utils/make_dir_path.c
@@ -0,0 +1,39 @@
+/*
+ * Make a path of subdirectories, tolerating EEXIST at every step.
+ */
+
+#include <errno.h>
+#include <string.h>
+
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "putty.h"
+
+char *make_dir_path(const char *path, mode_t mode)
+{
+    int pos = 0;
+    char *prefix;
+
+    while (1) {
+        pos += strcspn(path + pos, "/");
+
+        if (pos > 0) {
+            prefix = dupprintf("%.*s", pos, path);
+
+            if (mkdir(prefix, mode) < 0 && errno != EEXIST) {
+                char *ret = dupprintf("%s: mkdir: %s",
+                                      prefix, strerror(errno));
+                sfree(prefix);
+                return ret;
+            }
+
+            sfree(prefix);
+        }
+
+        if (!path[pos])
+            return NULL;
+        pos += strspn(path + pos, "/");
+    }
+}