iImplement chunked write to the cmdfd. - st - Simple Terminal	Err	gopher.r-36.net	70
i	Err	gopher.r-36.net	70
1Log	/scm/st//log.gph	gopher.r-36.net	70
1Files	/scm/st//files.gph	gopher.r-36.net	70
1Refs	/scm/st//refs.gph	gopher.r-36.net	70
1README	/scm/st//file/README.gph	gopher.r-36.net	70
1LICENSE	/scm/st//file/LICENSE.gph	gopher.r-36.net	70
i---	Err	gopher.r-36.net	70
1commit 261ea4b7e0b8d979c0c91ec75251c6970caf39e2	/scm/st//commit/261ea4b7e0b8d979c0c91ec75251c6970caf39e2.gph	gopher.r-36.net	70
1parent f8c6e7d0419d10c1425cb2c7123c5798ffb3b942	/scm/st//commit/f8c6e7d0419d10c1425cb2c7123c5798ffb3b942.gph	gopher.r-36.net	70
hAuthor: Christoph Lohmann <20h@r-36.net>	URL:mailto:20h@r-36.net	gopher.r-36.net	70
iDate:   Fri, 10 Jul 2015 14:15:39 +0200	Err	gopher.r-36.net	70
i	Err	gopher.r-36.net	70
iImplement chunked write to the cmdfd.	Err	gopher.r-36.net	70
i	Err	gopher.r-36.net	70
iThis is needed so big input like a paste of several megabyte does not clog our	Err	gopher.r-36.net	70
iI/O.	Err	gopher.r-36.net	70
i	Err	gopher.r-36.net	70
iDiffstat:	Err	gopher.r-36.net	70
i  st.c                                |      53 +++++++++++++++++++++++++++++--	Err	gopher.r-36.net	70
i	Err	gopher.r-36.net	70
i1 file changed, 51 insertions(+), 2 deletions(-)	Err	gopher.r-36.net	70
i---	Err	gopher.r-36.net	70
1diff --git a/st.c b/st.c	/scm/st//file/st.c.gph	gopher.r-36.net	70
i@@ -1478,8 +1478,57 @@ ttyread(void)	Err	gopher.r-36.net	70
i void	Err	gopher.r-36.net	70
i tttywrite(const char *s, size_t n)	Err	gopher.r-36.net	70
i {	Err	gopher.r-36.net	70
i-        if (xwrite(cmdfd, s, n) == -1)	Err	gopher.r-36.net	70
i-                die("write error on tty: %s\n", strerror(errno));	Err	gopher.r-36.net	70
i+        fd_set wfd;	Err	gopher.r-36.net	70
i+        struct timespec tv;	Err	gopher.r-36.net	70
i+        ssize_t r;	Err	gopher.r-36.net	70
i+	Err	gopher.r-36.net	70
i+        /*	Err	gopher.r-36.net	70
i+         * Remember that we are using a pty, which might be a modem line.	Err	gopher.r-36.net	70
i+         * Writing too much will clog the line. That's why we are doing this	Err	gopher.r-36.net	70
i+         * dance.	Err	gopher.r-36.net	70
i+         * FIXME: Migrate the world to Plan 9.	Err	gopher.r-36.net	70
i+         */	Err	gopher.r-36.net	70
i+        while (n > 0) {	Err	gopher.r-36.net	70
i+                FD_ZERO(&wfd);	Err	gopher.r-36.net	70
i+                FD_SET(cmdfd, &wfd);	Err	gopher.r-36.net	70
i+                tv.tv_sec = 0;	Err	gopher.r-36.net	70
i+                tv.tv_nsec = 0;	Err	gopher.r-36.net	70
i+	Err	gopher.r-36.net	70
i+                /* Check if we can write. */	Err	gopher.r-36.net	70
i+                if (pselect(cmdfd+1, NULL, &wfd, NULL, &tv, NULL) < 0) {	Err	gopher.r-36.net	70
i+                        if (errno == EINTR)	Err	gopher.r-36.net	70
i+                                continue;	Err	gopher.r-36.net	70
i+                        die("select failed: %s\n", strerror(errno));	Err	gopher.r-36.net	70
i+                }	Err	gopher.r-36.net	70
i+                if(!FD_ISSET(cmdfd, &wfd)) {	Err	gopher.r-36.net	70
i+                        /* No, then free some buffer space. */	Err	gopher.r-36.net	70
i+                        ttyread();	Err	gopher.r-36.net	70
i+                } else {	Err	gopher.r-36.net	70
i+                        /*	Err	gopher.r-36.net	70
i+                         * Only write 256 bytes at maximum. This seems to be a	Err	gopher.r-36.net	70
i+                         * reasonable value for a serial line. Bigger values	Err	gopher.r-36.net	70
i+                         * might clog the I/O.	Err	gopher.r-36.net	70
i+                         */	Err	gopher.r-36.net	70
i+                        r = write(cmdfd, s, (n < 256)? n : 256);	Err	gopher.r-36.net	70
i+                        if (r < 0) {	Err	gopher.r-36.net	70
i+                                die("write error on tty: %s\n",	Err	gopher.r-36.net	70
i+                                                strerror(errno));	Err	gopher.r-36.net	70
i+                        }	Err	gopher.r-36.net	70
i+                        if (r < n) {	Err	gopher.r-36.net	70
i+                                /*	Err	gopher.r-36.net	70
i+                                 * We weren't able to write out everything.	Err	gopher.r-36.net	70
i+                                 * This means the buffer is getting full	Err	gopher.r-36.net	70
i+                                 * again. Empty it.	Err	gopher.r-36.net	70
i+                                 */	Err	gopher.r-36.net	70
i+                                ttyread();	Err	gopher.r-36.net	70
i+                                n -= r;	Err	gopher.r-36.net	70
i+                                s += r;	Err	gopher.r-36.net	70
i+                        } else {	Err	gopher.r-36.net	70
i+                                /* All bytes have been written. */	Err	gopher.r-36.net	70
i+                                break;	Err	gopher.r-36.net	70
i+                        }	Err	gopher.r-36.net	70
i+                }	Err	gopher.r-36.net	70
i+        }	Err	gopher.r-36.net	70
i }	Err	gopher.r-36.net	70
i 	Err	gopher.r-36.net	70
i void	Err	gopher.r-36.net	70
.