fix transmitting large mails through POP

Signed-off-by: AGentooCat <agentoocat@mail.i2p>

src/pop.c

@@ -296,7 +296,7 @@ int pop_line(struct lineconn_t *hand) {
                 freemail(&mail);
                 return -1;
             }
-            if (write(hand->fd, mail.lines, mail.size) < mail.size)
+            if (xwrite(hand->fd, mail.lines, mail.size) < mail.size)
                 return -1;
             // the ending dot-crlf comes from database
             freemail(&mail);

src/util.c

@@ -41,7 +41,7 @@ void strip_crlf(const char *text) {
     size_t rem = len; \
     while (rem > 0) { \
 	ret = func(fd, &line[len - rem], rem); \
-	if (ret < 0 && errno != EINTR) return ret; \
+	if (ret < 0 && errno != EINTR && errno != EAGAIN && errno != EWOULDBLOCK) return ret; \
 	if (ret > 0) rem -= ret; \
     } \
     return len; \