Brian Pomerantz writes:

I've noticed a bug in the "autowidth" feature more, and is probably in
others.  The call to the function get_terminal_width_height() passes
in a file descriptor but that file descriptor is never used, instead
the ioctl() is called with 0.  In more_main() the call to
get_terminal_width_height() passes 0 as the file descriptor instead of
fileno(cin).  This isn't a problem when you more a file (e.g. "more
/etc/passwd") but when you pipe a file to it (e.g. "cat /etc/passwd |
more") the size of the terminal cannot be determined because file
descriptor 0 is not a terminal.  The fix is simple, I've attached a
patch for more.c and get_terminal_width_height.c.


BAPper

coreutils/ls.c

@@ -982,7 +982,7 @@ extern int ls_main(int argc, char **argv)
 
 #ifdef CONFIG_FEATURE_AUTOWIDTH
 	/* Obtain the terminal width.  */
-	get_terminal_width_height(0, &terminal_width, NULL);
+	get_terminal_width_height(fileno(stdout), &terminal_width, NULL);
 	/* Go one less... */
 	terminal_width--;
 #endif