sendmail: support AUTH PLAIN in addition to AUTH LOGIN

Implement the -am argument to allow choosing an AUTH method.
For now only PLAIN and LOGIN are supported, but others can be added
easily in the future.

AUTH PLAIN required adding a new variant of encode_base64() capable of
handling NUL characters in the input string; the old function is now a
wrapper for the newer one.

function                                             old     new   delta
encode_n_base64                                        -     236    +236
sendmail_main                                       1199    1380    +181
packed_usage                                       32873   32877      +4
encode_base64                                        242      36    -206
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 2/1 up/down: 421/-206)          Total: 215 bytes

Signed-off-by: Raffaello D. Di Napoli <rafdev@dinapo.li>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/mailutils/mail.c b/mailutils/mail.c
index 7af7edd..2ad959f 100644
--- a/mailutils/mail.c
+++ b/mailutils/mail.c
@@ -109,6 +109,17 @@
 
 void FAST_FUNC encode_base64(char *fname, const char *text, const char *eol)
 {
+	size_t len = len;
+	if (text) {
+		// though we do not call uuencode(NULL, NULL) explicitly
+		// still we do not want to break things suddenly
+		len = strlen(text);
+	}
+	encode_n_base64(fname, text, len, eol);
+}
+
+void FAST_FUNC encode_n_base64(char *fname, const char *text, size_t len, const char *eol)
+{
 	enum {
 		SRC_BUF_SIZE = 57,  /* This *MUST* be a multiple of 3 */
 		DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3),
@@ -116,17 +127,12 @@
 #define src_buf text
 	char src[SRC_BUF_SIZE];
 	FILE *fp = fp;
-	ssize_t len = len;
 	char dst_buf[DST_BUF_SIZE + 1];
 
 	if (fname) {
 		fp = (NOT_LONE_DASH(fname)) ? xfopen_for_read(fname) : (FILE *)text;
 		src_buf = src;
-	} else if (text) {
-		// though we do not call uuencode(NULL, NULL) explicitly
-		// still we do not want to break things suddenly
-		len = strlen(text);
-	} else
+	} else if (!text)
 		return;
 
 	while (1) {