Fixed bug #22355 (PHP would remove folding from Subject & To fields).

Author: Ilia Alshanetsky

ext/standard/mail.c

@@ -46,6 +46,15 @@
 #include "netware/sysexits.h"   /* For exit status codes like EX_OK */
 #endif
 
+#define SKIP_LONG_HEADER_SEP(str, pos)										\
+	if (str[pos] == '\r' && str[pos + 1] == '\n' && (str[pos + 2] == ' ' || str[pos + 2] == '\t')) {	\
+		pos += 3;											\
+		while (str[pos] == ' ' || str[pos] == '\t') {							\
+			pos++;											\
+		}												\
+		continue;											\
+	}													\
+
 /* {{{ proto int ezmlm_hash(string addr)
    Calculate EZMLM list hash value. */
 PHP_FUNCTION(ezmlm_hash)
@@ -102,6 +111,12 @@ PHP_FUNCTION(mail)
 		}
 		for (i = 0; to[i]; i++) {
 			if (iscntrl((unsigned char) to[i])) {
+				/* According to RFC 822, section 3.1.1 long headers may be separated into
+				 * parts using CRLF followed at least one linear-white-space character ('\t' or ' ').
+				 * To prevent these separators from being replaced with a space, we use the
+				 * SKIP_LONG_HEADER_SEP to skip over them.
+				 */
+				SKIP_LONG_HEADER_SEP(to, i);
 				to[i] = ' ';
 			}
 		}
@@ -116,6 +131,7 @@ PHP_FUNCTION(mail)
 		}
 		for(i = 0; subject[i]; i++) {
 			if (iscntrl((unsigned char) subject[i])) {
+				SKIP_LONG_HEADER_SEP(subject, i);
 				subject[i] = ' ';
 			}
 		}