Re: tgoto(3) says col,row but it seems to be x,col?

[Thomas Dickey]

On Sat, Mar 19, 2016 at 04:40:17PM +0100, Steffen Nurpmeso wrote:
> Hello,
> 
> and termcap(5) says "ch Move cursor horizontally only to column
> %1" and terminfo(5) says "column_address hpa ch horizontal
> %position #1, absolute (P)", but when i'm doing
> n_termcap_cmd(n_TERMCAP_CMD_ch, w, -1) which translates to
> tgoto(cp, a1, a2) then nothing happens, i have to write
> tgoto(cp,0,a1) instead.

yes, that's right, but puzzling

The problem is that tgoto documention refers to "col,row" but
two-parameter cursor movement strings conventionally put the row
first.  So tgoto has "always" reversed those parameters.

Also, tgoto does not pay any attention to the number of parameters
a capability uses: it simply reverses all of the col/row to row/col
values.

(I made a to-do item to clarify the manpage...)
 
> I.e., the following program moves the cursor to column 42!
> That's not right, is it.  This is on current ArchLinux.
> 
>   #include <stdio.h>
>   #include <stdlib.h>
>   #include <unistd.h>
>   
>   #include <curses.h>
>   #include <term.h>
>   
>   int main(void){
>      char buf[4096], *bp, *c_ch, *cp;
>   
>      if(tgetent(bp = buf, getenv("TERM")) <= 0)
>         return 1;
>   
>      if((c_ch = tgetstr("ch", NULL)) == NULL)
>         return 2;
>               
>      if((cp = tgoto(c_ch, 5, 42)) == NULL)
>         return 3;
>   
>      printf("\n");
>      tputs(cp, 1, putchar);
>      fflush(stdout);
>      sleep(5);   
>      return 0;   
>   }
> 
> --steffen
> 
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-- 
Thomas E. Dickey <address@hidden>
http://invisible-island.net
ftp://invisible-island.net

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