X-Git-Url: http://git.iain.cx/?a=blobdiff_plain;f=lib%2Ffunctions.php;h=0f2e0e782662a9881b523a5763382524d697c45a;hb=446bce55325fc63d0583b838111d387764be498f;hp=73ea46443743007dd483b8a2d5d80bc6dd888516;hpb=1fb7460a871d2342eca8a99d5e6a4af26c019372;p=readifood.git

diff --git a/lib/functions.php b/lib/functions.php
index 73ea464..0f2e0e7 100644
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -514,6 +514,52 @@
     echo "Day: <input name=\"$name" . "_d\" value=\"$d\" size=2 maxlen=2> ";
   }
 
+  function validate_postcode($postcode, &$outward = null, &$inward = null) {
+    /*
+      Valid postcode formats (BS766):
+
+        AN NLL
+        ABN NLL
+        ANN NLL
+        ABNN NLL
+        ABND NLL
+        ANC NLL
+
+      Where N is a number; A is a letter not including Q, V, X;
+      B is a letter not including I, J, Z; C is a letter from the set
+      ABCDEFGHJKSTUW; D is a letter from the set ABEHMNPRVWXY;
+      L is a letter from the set ABDEFGHJLNPQRSTUWXYZ.
+
+      The postcode GIR 0AA is also valid.
+    */
+    $outward = $inward = null;
+
+    /* Treat blank as valid for convenience. */
+    $postcode = trim($postcode);
+    if (! $postcode) return true;
+
+    $A = '[ABCDEFGHIJKLMNOPRSTUWYZ]';
+    $B = '[ABCDEFGHKLMNOPQRSTUVWXY]';
+    $C = '[ABCDEFGHJKSTUW]';
+    $D = '[ABEHMNPRVWXY]';
+    $L = '[ABDEFGHJLNPQRSTUWXYZ]';
+    $N = '\d';
+    if (! preg_match("/^($A$N|$A$B$N|$A$N$N|$A$B$N$N|$A$B$N$D|$A$N$C|GIR)\s*($N$L$L)$/", $postcode, $m)) return false;
+    if ($m[1] == "GIR" && $m[2] != "0AA") return false;
+    list($ignored, $outward, $inward) = $m;
+    return true;
+  }
+
+  function format_postcode($postcode, $complain = true) {
+    if (validate_postcode($postcode, $outward, $inward)) {
+      return "$outward $inward";
+    }
+    if ($complain) {
+      echo "<p>Invalid postcode!</p>\n";
+      return null;
+    }
+  }
+
   function get_small_link() {
     /* Args are <alt text>, <format>, [<stuff> ...] */
     $args = func_get_args();