/* Specification. */
#include <arpa/inet.h>
-#include <ctype.h>
+#include <c-ctype.h>
#include <string.h>
#include <errno.h>
curtok = src;
saw_xdigit = 0;
val = 0;
- while ((ch = tolower (*src++)) != '\0')
+ while ((ch = c_tolower (*src++)) != '\0')
{
const char *pch;