# st

Unnamed repository; edit this file 'description' to name the repository.

| Log | Files | Refs | README | LICENSE

    commit e52319cc7d153e4f59b38c4fb4c0556e118d4775
    parent 21e0d6e8b8d20903494386e7e6f43201b3761154
    Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
    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:
    Mst.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