--- /dev/null
+#include "config.h"
+#include <ccan/str/str_debug.h>
+#include <assert.h>
+#include <ctype.h>
+#include <string.h>
+
+#ifdef CCAN_STR_DEBUG
+/* Because we mug the real ones with macros, we need our own wrappers. */
+int str_isalnum(int i)
+{
+ assert(i >= -1 && i < 256);
+ return isalnum(i);
+}
+
+int str_isalpha(int i)
+{
+ assert(i >= -1 && i < 256);
+ return isalpha(i);
+}
+
+int str_isascii(int i)
+{
+ assert(i >= -1 && i < 256);
+ return isascii(i);
+}
+
+int str_isblank(int i)
+{
+ assert(i >= -1 && i < 256);
+ return isblank(i);
+}
+
+int str_iscntrl(int i)
+{
+ assert(i >= -1 && i < 256);
+ return iscntrl(i);
+}
+
+int str_isdigit(int i)
+{
+ assert(i >= -1 && i < 256);
+ return isdigit(i);
+}
+
+int str_isgraph(int i)
+{
+ assert(i >= -1 && i < 256);
+ return isgraph(i);
+}
+
+int str_islower(int i)
+{
+ assert(i >= -1 && i < 256);
+ return islower(i);
+}
+
+int str_isprint(int i)
+{
+ assert(i >= -1 && i < 256);
+ return isprint(i);
+}
+
+int str_ispunct(int i)
+{
+ assert(i >= -1 && i < 256);
+ return ispunct(i);
+}
+
+int str_isspace(int i)
+{
+ assert(i >= -1 && i < 256);
+ return isspace(i);
+}
+
+int str_isupper(int i)
+{
+ assert(i >= -1 && i < 256);
+ return isupper(i);
+}
+
+int str_isxdigit(int i)
+{
+ assert(i >= -1 && i < 256);
+ return isxdigit(i);
+}
+
+
+char *str_strstr(const char *haystack, const char *needle)
+{
+ return strstr(haystack, needle);
+}
+
+char *str_strchr(const char *haystack, int c)
+{
+ return strchr(haystack, c);
+}
+
+char *str_strrchr(const char *haystack, int c)
+{
+ return strrchr(haystack, c);
+}
+#endif