[hackers] [st] Fix SI and SO || Roberto E. Vargas Caballero

[git]

commit 0c8feecbf74674132070169986802c75dd49d688
Author: Roberto E. Vargas Caballero <k...@shike2.com>
Date:   Wed Oct 8 10:30:20 2014 +0200

    Fix SI and SO
    
    SI (0x0F or ^O) means Shift In, and it selects G1 charset definition,
    and SO (0x0E or ^N) means Shift Out, and it selects G0 charset
    definition, but st was doing just the inverse.

diff --git a/st.c b/st.c
index c90bed1..19e4379 100644
--- a/st.c
+++ b/st.c
@@ -2431,11 +2431,9 @@ tcontrolcode(uchar ascii) {
                term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
                term.esc |= ESC_START;
                return;
-       case '\016': /* SO */
-               term.charset = 0;
-               return;
-       case '\017': /* SI */
-               term.charset = 1;
+       case '\016': /* SO (LS1 -- Locking shift 1) */
+       case '\017': /* SI (LS0 -- Locking shift 0) */
+               term.charset = 1 - (ascii - '\016');
                return;
        case '\032': /* SUB */
                tsetchar(question, &term.c.attr, term.c.x, term.c.y);