Move mkdirp into libi3

libi3/mkdirp.c

@@ -0,0 +1,38 @@
+#include "libi3.h"
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+
+/*
+ * Emulates mkdir -p (creates any missing folders)
+ *
+ */
+bool mkdirp(const char *path) {
+    if (mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) == 0)
+        return true;
+    if (errno != ENOENT) {
+        ELOG("mkdir(%s) failed: %s\n", path, strerror(errno));
+        return false;
+    }
+    char *copy = sstrdup(path);
+    /* strip trailing slashes, if any */
+    while (copy[strlen(copy) - 1] == '/')
+        copy[strlen(copy) - 1] = '\0';
+
+    char *sep = strrchr(copy, '/');
+    if (sep == NULL) {
+        if (copy != NULL) {
+            free(copy);
+            copy = NULL;
+        }
+        return false;
+    }
+    *sep = '\0';
+    bool result = false;
+    if (mkdirp(copy))
+        result = mkdirp(path);
+    free(copy);
+
+    return result;
+}