From: "Dave Yeo" <gnuports@2rosenthals.com>
Subject: Re: [GNU Ports] Terminal width?
To: GNU Ports for eCS Mailing List <gnuports@2rosenthals.com>
References: <list-3690555@2rosenthals.com>
Message-ID: <b327f8fd-c570-59b4-7e2a-5b0fc428c46e@gmail.com>
Date: Sat, 14 May 2022 18:52:07 -0700
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On 05/14/22 11:35 AM, Steven Levine wrote:
> In <list-3690493@2rosenthals.com>, on 05/14/22
>    at 10:29 AM, "Dave Yeo" <gnuports@2rosenthals.com> said:
>
> Hi Dave,
>
>> Need something like this, but we are missing TIOCGWINSZ()
>> int term_width(int fd)
>> {
>>         struct winsize geometry;
>>         geometry.ws_col = 0;
>>         if(ioctl(fd, TIOCGWINSZ, &geometry) >= 0)
>>                 return (int)geometry.ws_col;
>>         return -1;
>> }
>
>> Ideas? Even OS/2 API?
>
> Assuming this is a VIO app, the Vio functions are your friends.
> VioGetMode should give you what you need.
>

Hunting for example code, I found in libc (and EMX where it is documented),

Headers:

#include <stdlib.h>


Prototype:

void _scrsize (int *dst);

Compatibility:

emx

Description:

Retrieve the screen (window) size. The number of text columns (width) is 
stored to dst[0], the number of text rows (height) is stored to dst[1].

See also: v_dimen()

Does this code make sense?

/* Also serves as a way to detect if we have an interactive terminal. */
#ifndef __OS2__
int term_width(int fd)
{
         struct winsize geometry;
         geometry.ws_col = 0;
         if(ioctl(fd, TIOCGWINSZ, &geometry) >= 0)
                 return (int)geometry.ws_col;
         return -1;
}
#else
int term_width(int fd)
{
         int dst[1];
         void _scrsize (int *dst);
                  return dst[0];
}
#endif

Thanks,
Dave