1 files changed, 25 insertions, 0 deletions
diff --git a/src/libs6dns/s6dns_fmt_domainlist.c b/src/libs6dns/s6dns_fmt_domainlist.c
new file mode 100644
index 0000000..d53050a
--- /dev/null
+++ b/src/libs6dns/s6dns_fmt_domainlist.c
@@ -0,0 +1,25 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <skalibs/bytestr.h>
+#include <s6-dns/s6dns-domain.h>
+#include <s6-dns/s6dns-fmt.h>
+
+unsigned int s6dns_fmt_domainlist (char *s, unsigned int max, s6dns_domain_t const *list, unsigned int n, char const *delim, unsigned int delimlen)
+{
+  unsigned int len = 0 ;
+  register unsigned int i = 0 ;
+  for (; i < n ; i++)
+  {
+    register unsigned int r = s6dns_domain_tostring(s + len, max - len, list + i) ;
+    if (!r) return 0 ;
+    len += r ;
+    if (i+1 < n)
+    {
+      if (len + delimlen > max) return (errno = ENAMETOOLONG, 0) ;
+      byte_copy(s + len, delimlen, delim) ;
+      len += delimlen ;
+    }
+  }
+  return len ;
+}