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tweaks: reduce a bunch of repetitious comments to their essence 

And in the bargain add two missing equivalences.
master
Benno Schulenberg 2018-12-30 17:31:36 +01:00
parent e7198f49a4
commit 4d55748999
1 changed files with 9 additions and 8 deletions
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17
src/winio.c
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@ -1497,26 +1497,27 @@ long get_unicode_kbinput(WINDOW *win, int kbinput)
}
#endif /* ENABLE_UTF8 */
/* Translate a control character sequence: turn an ASCII non-control
* character into its corresponding control character. */
/* Translate a normal ASCII character into its corresponding control code.
* The following groups of control keystrokes are equivalent:
* Ctrl-2 == Ctrl-@ == Ctrl-` == Ctrl-Space
* Ctrl-3 == Ctrl-[ == <Esc>
* Ctrl-4 == Ctrl-\ == Ctrl-|
* Ctrl-5 == Ctrl-]
* Ctrl-6 == Ctrl-^ == Ctrl-~
* Ctrl-7 == Ctrl-/ == Ctrl-_
* Ctrl-8 == Ctrl-? */
int get_control_kbinput(int kbinput)
{
/* Ctrl-Space (Ctrl-2, Ctrl-@, Ctrl-`) */
if (kbinput == ' ' || kbinput == '2')
return 0;
/* Ctrl-/ (Ctrl-7, Ctrl-_) */
else if (kbinput == '/')
return 31;
/* Ctrl-3 (Ctrl-[, Esc) to Ctrl-7 (Ctrl-/, Ctrl-_) */
else if ('3' <= kbinput && kbinput <= '7')
return kbinput - 24;
/* Ctrl-8 (Ctrl-?) */
else if (kbinput == '8' || kbinput == '?')
return DEL_CODE;
/* Ctrl-@ (Ctrl-Space, Ctrl-2, Ctrl-`) to Ctrl-_ (Ctrl-/, Ctrl-7) */
else if ('@' <= kbinput && kbinput <= '_')
return kbinput - '@';
/* Ctrl-` (Ctrl-2, Ctrl-Space, Ctrl-@) to Ctrl-~ (Ctrl-6, Ctrl-^) */
else if ('`' <= kbinput && kbinput <= '~')
return kbinput - '`';
else