1 files changed, 31 insertions, 0 deletions
diff --git a/src/core/ngx_string.c b/src/core/ngx_string.c
index c0bcc1d12..3456baa5c 100644
--- a/src/core/ngx_string.c
+++ b/src/core/ngx_string.c
@@ -820,6 +820,37 @@ ngx_memn2cmp(u_char *s1, u_char *s2, size_t n1, size_t n2)
 
 
 ngx_int_t
+ngx_dns_strcmp(u_char *s1, u_char *s2)
+{
+    ngx_uint_t  c1, c2;
+
+    for ( ;; ) {
+        c1 = (ngx_uint_t) *s1++;
+        c2 = (ngx_uint_t) *s2++;
+
+        c1 = (c1 >= 'A' && c1 <= 'Z') ? (c1 | 0x20) : c1;
+        c2 = (c2 >= 'A' && c2 <= 'Z') ? (c2 | 0x20) : c2;
+
+        if (c1 == c2) {
+
+            if (c1) {
+                continue;
+            }
+
+            return 0;
+        }
+
+        /* in ASCII '.' > '-', but we need '.' to be the lowest character */
+
+        c1 = (c1 == '.') ? ' ' : c1;
+        c2 = (c2 == '.') ? ' ' : c2;
+
+        return c1 - c2;
+    }
+}
+
+
+ngx_int_t
 ngx_atoi(u_char *line, size_t n)
 {
     ngx_int_t  value;