1 files changed, 6 insertions, 2 deletions
diff --git a/src/clients/s6dns_namescanner.c b/src/clients/s6dns_namescanner.c
index 136b1e8..c2110d2 100644
--- a/src/clients/s6dns_namescanner.c
+++ b/src/clients/s6dns_namescanner.c
@@ -1,12 +1,16 @@
 /* ISC license. */
 
+#include <sys/types.h>
+#include <limits.h>
+#include <errno.h>
 #include <s6-dns/s6dns-domain.h>
 #include "s6dns-generic-filter.h"
 
-unsigned int s6dns_namescanner (s6dns_domain_t *d, char const *s)
+size_t s6dns_namescanner (s6dns_domain_t *d, char const *s)
 {
-  register unsigned int pos = 0 ;
+  register size_t pos = 0 ;
   while (s[pos] && (s[pos] != ' ') && (s[pos] != '\t') && (s[pos] != '\r') && (s[pos] != '\n')) pos++ ;
+  if (pos > UINT_MAX) return (errno = ENAMETOOLONG, 0) ;
   if (!s6dns_domain_fromstring_noqualify_encode(d, s, pos)) return 0 ;
   return pos ;
 }