Imported Upstream version 0.66.1

[hcoop/debian/courier-authlib.git] / libs / rfc822 / rfc822hdr.c

diff --git a/rfc822/rfc822hdr.c b/libs/rfc822/rfc822hdr.c
similarity index 69%
rename from rfc822/rfc822hdr.c
rename to libs/rfc822/rfc822hdr.c
index 95bcbd7..1ce3106 100644 (file)
--- a/rfc822/rfc822hdr.c
+++ b/libs/rfc822/rfc822hdr.c
@@ -1,15 +1,15 @@
 /*
-** Copyright 2001 Double Precision, Inc.
+** Copyright 2001-2011 Double Precision, Inc.
 ** See COPYING for distribution information.
 */
 
+#include       "config.h"
 #include       <stdio.h>
 #include       <ctype.h>
 #include       <stdlib.h>
 #include       <string.h>
 #include       "rfc822hdr.h"
 
-static const char rcsid[]="$Id: rfc822hdr.c,v 1.2 2009/11/08 18:14:47 mrsam Exp $";
 
 /*
 ** Read the next mail header.
@@ -128,14 +128,33 @@ void rfc822hdr_collapse(struct rfc822hdr *h)
        *q=0;
 }
 
+/* This is, basically, a case-insensitive US-ASCII comparison function */
+
+#define lc(x) ((x) >= 'A' && (x) <= 'Z' ? (x) + ('a'-'A'):(x))
+
+int rfc822hdr_namecmp(const char *a, const char *b)
+{
+       int rc;
+
+       while ((rc=(int)(unsigned char)lc(*a) - (int)(unsigned char)lc(*b))==0)
+       {
+               if (!*a)
+                       return 0;
+               ++a;
+               ++b;
+       }
+
+       return rc;
+}
+
 int rfc822hdr_is_addr(const char *hdr)
 {
-       return strcasecmp(hdr, "from") == 0 ||
-               strcasecmp(hdr, "to") == 0 ||
-               strcasecmp(hdr, "cc") == 0 ||
-               strcasecmp(hdr, "bcc") == 0 ||
-               strcasecmp(hdr, "resent-from") == 0 ||
-               strcasecmp(hdr, "resent-to") == 0 ||
-               strcasecmp(hdr, "resent-cc") == 0 ||
-               strcasecmp(hdr, "resent-bcc") == 0;
+       return rfc822hdr_namecmp(hdr, "from") == 0 ||
+               rfc822hdr_namecmp(hdr, "to") == 0 ||
+               rfc822hdr_namecmp(hdr, "cc") == 0 ||
+               rfc822hdr_namecmp(hdr, "bcc") == 0 ||
+               rfc822hdr_namecmp(hdr, "resent-from") == 0 ||
+               rfc822hdr_namecmp(hdr, "resent-to") == 0 ||
+               rfc822hdr_namecmp(hdr, "resent-cc") == 0 ||
+               rfc822hdr_namecmp(hdr, "resent-bcc") == 0;
 }