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	ttyread: test for EOF while reading tty - st - simple terminal
	git clone git://git.suckless.org/st
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	---
	commit e52319cc7d153e4f59b38c4fb4c0556e118d4775
	parent 21e0d6e8b8d20903494386e7e6f43201b3761154
	Author: Roberto E. Vargas Caballero <[email protected]>
	Date: Fri, 10 Apr 2020 22:25:46 +0200

	ttyread: test for EOF while reading tty

	When a read operation returns 0 then it means that we arrived to the end of the
	file, and new reads will return 0 unless you do some other operation such as
	lseek(). This case happens with USB-232 adapters when they are unplugged.

	Diffstat:
	M st.c \| 25 ++++++++++++++++---------

	1 file changed, 16 insertions(+), 9 deletions(-)
	---
	diff --git a/st.c b/st.c
	@@ -823,17 +823,24 @@ ttyread(void)
	int ret;

	/* append read bytes to unprocessed bytes */
	- if ((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
	- die("couldn't read from shell: %s\n", strerror(errno));
	- buflen += ret;
	+ ret = read(cmdfd, buf+buflen, LEN(buf)-buflen);

	- written = twrite(buf, buflen, 0);
	- buflen -= written;
	- /* keep any uncomplete utf8 char for the next call */
	- if (buflen > 0)
	- memmove(buf, buf + written, buflen);
	+ switch (ret) {
	+ case 0:
	+ fputs("Found EOF in input\n", stderr);
	+ exit(0);
	+ case -1:
	+ die("couldn't read from shell: %s\n", strerror(errno));
	+ default:
	+ buflen += ret;
	+ written = twrite(buf, buflen, 0);
	+ buflen -= written;
	+ /* keep any uncomplete utf8 char for the next call */
	+ if (buflen > 0)
	+ memmove(buf, buf + written, buflen);
	+ return ret;

	- return ret;
	+ }
	}

	void