Similar to r251236, improve the portion of dialog(1) API in dialog.subr

responsible for retrieving stored input (for the --inputbox and --password
widgets).

When we (Ron McDowell and I) developed the first version of bsdconfig, it
used temporary files to store responses from dialog(1). That hasn't been
true for a very long time, so the need to always execute some clean-up
function is long-deprecated. The function that used to perform these clean-
up routines for these widgets was f_dialog_inputstr().

We really don't need f_dialog_inputstr() for its originally designed purpose
as all dialog invocations no longer require temporary files.

Just as in r251236, redesign f_dialog_inputstr() in the following four ways:

1. Rename f_dialog_inputstr() to f_dialog_inputstr_fetch()
2. Introduce the new first-argument of $var_to_set to reduce forking
3. Create a corresponding f_dialog_inputstr_store() to abstract storage
4. Offload the sanitization to a new function, f_dialog_line_sanitize()

It should be noted that f_dialog_line_sanitize() -- unlike its cousin from
SVN r251236, f_dialog_data_sanitize() -- trims leading/trailing whitespace
from the user's input. This helps prevent errors and common mistakes caused
by the fact that the new cdialog implementation allows the right-arrow
cursor key to go beyond the last byte of realtime input (adding whitespace
at the end of the typed value).

While we're centralizing the sanitization, let's rewrite f_dialog_input()
while we're here to likewise reduce forking. The f_dialog_input() function
now expects the first argument of $var_to_set instead of producing results
on standard-out.

These changes greatly improve readability and also improve performance.

1 files changed, 2 insertions, 3 deletions

diff --git a/usr.sbin/bsdconfig/mouse/flags b/usr.sbin/bsdconfig/mouse/flags
index d6f50e8..4d646d3 100755
--- a/usr.sbin/bsdconfig/mouse/flags
+++ b/usr.sbin/bsdconfig/mouse/flags
@@ -79,9 +79,8 @@ flags=$( f_sysrc_get moused_flags )
 # Prompt the user with the current value
 #
 f_dialog_title "$msg_value_required"
-flags=$( f_dialog_input "$msg_please_specify_the_mouse_daemon_flags" \
-                        "$flags"
-       ) || f_die
+f_dialog_input flags "$msg_please_specify_the_mouse_daemon_flags" \
+               "$flags" || f_die
 f_dialog_title_restore
 
 #