1 files changed, 74 insertions, 0 deletions
diff --git a/lib/minitasn1/gstr.c b/lib/minitasn1/gstr.c
new file mode 100644
index 0000000..1475ed5
--- /dev/null
+++ b/lib/minitasn1/gstr.c
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2002-2021 Free Software Foundation, Inc.
+ *
+ * This file is part of LIBTASN1.
+ *
+ * The LIBTASN1 library is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include <int.h>
+#include "gstr.h"
+
+/* These function are like strcat, strcpy. They only
+ * do bounds checking (they shouldn't cause buffer overruns),
+ * and they always produce null terminated strings.
+ *
+ * They should be used only with null terminated strings.
+ */
+void
+_asn1_str_cat (char *dest, size_t dest_tot_size, const char *src)
+{
+  size_t str_size = strlen (src);
+  size_t dest_size = strlen (dest);
+
+  if (dest_tot_size - dest_size > str_size)
+    {
+      strcat (dest, src);
+    }
+  else
+    {
+      if (dest_tot_size > dest_size)
+	{
+	  strncat (dest, src, (dest_tot_size - dest_size) - 1);
+	  dest[dest_tot_size - 1] = 0;
+	}
+    }
+}
+
+/* Returns the bytes copied (not including the null terminator) */
+unsigned int
+_asn1_str_cpy (char *dest, size_t dest_tot_size, const char *src)
+{
+  size_t str_size = strlen (src);
+
+  if (dest_tot_size > str_size)
+    {
+      strcpy (dest, src);
+      return str_size;
+    }
+  else
+    {
+      if (dest_tot_size > 0)
+	{
+	  str_size = dest_tot_size - 1;
+	  memcpy (dest, src, str_size);
+	  dest[str_size] = 0;
+	  return str_size;
+	}
+      else
+	return 0;
+    }
+}