1 files changed, 113 insertions, 0 deletions
diff --git a/src/hfield.c b/src/hfield.c
new file mode 100644
index 0000000..2376e1f
--- /dev/null
+++ b/src/hfield.c
@@ -0,0 +1,113 @@
+#include "hfield.h"
+
+static char *(hname[]) = {
+  "unknown-header"
+, "sender"
+, "from"
+, "reply-to"
+, "to"
+, "cc"
+, "bcc"
+, "date"
+, "message-id"
+, "subject"
+, "resent-sender"
+, "resent-from"
+, "resent-reply-to"
+, "resent-to"
+, "resent-cc"
+, "resent-bcc"
+, "resent-date"
+, "resent-message-id"
+, "return-receipt-to"
+, "errors-to"
+, "apparently-to"
+, "received"
+, "return-path"
+, "delivered-to"
+, "content-length"
+, "content-type"
+, "content-transfer-encoding"
+, "notice-requested-upon-delivery-to"
+, "mail-followup-to"
+, 0
+};
+
+static int hmatch( char *s,int len,char *t)
+{
+  int i;
+  char ch;
+
+  for (i = 0; (ch = t[i]); ++i) {
+    if (i >= len) return 0;
+    if (ch != s[i]) {
+      if (ch == '-') return 0;
+      if (ch - 32 != s[i]) return 0;
+    }
+  }
+  for (;;) {
+    if (i >= len) return 0;
+    ch = s[i];
+    if (ch == ':') return 1;
+    if ((ch != ' ') && (ch != '\t')) return 0;
+    ++i;
+  }
+}
+
+int hfield_known(char *s,int len)
+{
+  int i;
+  char *t;
+
+  for (i = 1; (t = hname[i]); ++i)
+    if (hmatch(s,len,t))
+      return i;
+ 
+ return 0;
+}
+
+int hfield_valid(char *s,int len)
+{
+  int i;
+  int j;
+  char ch;
+
+  for (j = 0; j < len; ++j)
+    if (s[j] == ':') break;
+
+  if (j >= len) return 0;
+  
+  while (j) {
+    ch = s[j - 1];
+    if ((ch != ' ') && (ch != '\t'))
+      break;
+    --j;
+  }
+  if (!j) return 0;
+
+  for (i = 0; i < j; ++i) {
+    ch = s[i];
+    if (ch <= 32) return 0;
+    if (ch >= 127) return 0;
+   }
+  return 1;
+}
+
+unsigned int hfield_skipname(char *s,int len)
+{
+  int i;
+  char ch;
+
+  for (i = 0; i < len; ++i)
+    if (s[i] == ':') break;
+
+  if (i < len) ++i;
+     while (i < len) {
+       ch = s[i];
+       if ((ch != '\t') && (ch != '\n') && (ch != '\r') && (ch != ' '))
+         break;
+        ++i;
+     }
+
+  return i;
+}