1 files changed, 30 insertions, 0 deletions
diff --git a/src/libs6dns/s6dns_domain_qualify.c b/src/libs6dns/s6dns_domain_qualify.c
new file mode 100644
index 0000000..6194ab5
--- /dev/null
+++ b/src/libs6dns/s6dns_domain_qualify.c
@@ -0,0 +1,30 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <skalibs/bytestr.h>
+#include <s6-dns/s6dns-domain.h>
+
+unsigned int s6dns_domain_qualify (s6dns_domain_t *list, s6dns_domain_t const *d, char const *rules, unsigned int rulesnum)
+{
+  if (!d->len) return (errno = EINVAL, 0) ;
+  if (d->s[d->len - 1] == '.')
+  {
+    list[0] = *d ;
+    return 1 ;
+  }
+  else
+  {
+    register unsigned int i = 0 ;
+    for (; i < rulesnum ; i++)
+    {
+      unsigned int n = str_len(rules) ;
+      if (d->len + n >= 254) return (errno = ENAMETOOLONG, 0) ;
+      list[i] = *d ;
+      list[i].s[d->len] = '.' ;
+      byte_copy(list[i].s + d->len + 1, n, rules) ;
+      list[i].len += n+1 ;
+      rules += n+1 ;
+    }
+    return i ;
+  }
+}