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    commit 74d6abfee5a1455c7c126d6b78760efd65d9d7c3
    parent c3b6345595c6b5ec5925544a2f462458f16cbf6a
    Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
    Date:   Mon, 24 Sep 2012 10:29:37 +0200

    Add some documentetion to tsetmode

    The names of the terminal modes supported by vt102 are (taken from the VT220
    programmer reference manual):

    Table 4-7 ANSI-Standardized Modes
    Name  Mnemonic		    Parameter (Ps)
    Error (ignored)		    -         0 (3/0)
    Keyboard action		    KAM	      2 (3/2)
    Insert/replace		    IRM	      4 (3/4)
    Send/receive		    SRM	      12 (3/1 3/2)
    Line feed/new line	    LNM       20 (3/2 3/0)

    Table 4-8 ANSI-Compatible DEC Private Modes
    Name  Mnemonic		  Parameter (Ps)
    Error (ignored)		  -	    0 (3/0)
    Cursor key		  DECCKM    1 (3/1)
    ANSI/VT52		  DECANM    2 (3/2)
    Column			  DECCOLM   3 (3/3)
    Scroll			  DECSCLM   4 (3/4)
    Screen			  DECSCNM   5 (3/5)
    Origin			  DECOM	    6 (3/6)
    Auto wrap		  DECAWM    7 (3/7)
    Auto repeat		  DECARM    8 (3/8)
    Printer form feed	  DECPFF    18 (3/1 3/8)
    Printer extent		  DECPEX    19 (3/1 3/9)
    Text cursor enable	  DECTCEM   25 (3/2 3/5)
    National replacement character sets DECNRCM 42 (3/4 3/2)

    This patch adds a comment for each one of these sequences.
    ---
     st.c |   26 +++++++++++++++++++++-----
     1 file changed, 21 insertions(+), 5 deletions(-)
    Diffstat:
    Mst.c | 26+++++++++++++++++++++-----

    1 file changed, 21 insertions(+), 5 deletions(-)
    diff --git a/st.c b/st.c
    @@ -1280,7 +1280,8 @@ tsetmode(bool priv, bool set, int *args, int narg) {
     	for(lim = args + narg; args < lim; ++args) {
     		if(priv) {
     			switch(*args) {
    -			case 1:
    +				break;
    +			case 1: /* DECCKM -- Cursor key */
     				MODBIT(term.mode, set, MODE_APPKEYPAD);
     				break;
     			case 5: /* DECSCNM -- Reverve video */
    @@ -1289,9 +1290,14 @@ tsetmode(bool priv, bool set, int *args, int narg) {
     				if(mode != term.mode)
     					redraw();
     				break;
    -			case 7:
    +			case 6: /* XXX: DECOM -- Origin */
    +				break;
    +			case 7: /* DECAWM -- Auto wrap */
     				MODBIT(term.mode, set, MODE_WRAP);
     				break;
    +			case 8: /* XXX: DECARM -- Auto repeat */
    +				break;
    +			case 0:  /* Error (IGNORED) */
     			case 12: /* att610 -- Start blinking cursor (IGNORED) */
     				break;
     			case 25:
    @@ -1319,6 +1325,12 @@ tsetmode(bool priv, bool set, int *args, int narg) {
     				tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
     				break;
     			default:
    +			/* case 2:  DECANM -- ANSI/VT52 (NOT SUPPOURTED) */
    +			/* case 3:  DECCOLM -- Column  (NOT SUPPORTED) */
    +			/* case 4:  DECSCLM -- Scroll (NOT SUPPORTED) */
    +			/* case 18: DECPFF -- Printer feed (NOT SUPPORTED) */
    +			/* case 19: DECPEX -- Printer extent (NOT SUPPORTED) */
    +			/* case 42: DECNRCM -- National characters (NOT SUPPORTED) */
     				fprintf(stderr,
     					"erresc: unknown private set/reset mode %d\n",
     					*args);
    @@ -1326,13 +1338,17 @@ tsetmode(bool priv, bool set, int *args, int narg) {
     			}
     		} else {
     			switch(*args) {
    -			case 2:
    +			case 0:  /* Error (IGNORED) */
    +				break;
    +			case 2:  /* KAM -- keyboard action */
     				MODBIT(term.mode, set, MODE_KBDLOCK);
     				break;
    -			case 4:
    +			case 4:  /* IRM -- Insertion-replacement */
     				MODBIT(term.mode, set, MODE_INSERT);
     				break;
    -			case 20:
    +			case 12: /* XXX: SRM -- Send/Receive */
    +				break;
    +			case 20: /* LNM -- Linefeed/new line */
     				MODBIT(term.mode, set, MODE_CRLF);
     				break;
     			default: