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Hi,</div>
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you are right.</div>
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PFA a patch for unit tests i added that can maybe go in when fold moves from pending??,</div>
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the main intention is to discuss what i was unable to communicate(limitation on my part), i added a comment too</div>
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so if anyone can cross check , that would be helpful<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Samuel Holland <samuel@sholland.org><br>
<b>Sent:</b> Monday, August 27, 2018 10:28 PM<br>
<b>To:</b> haroon maqsood; toybox@lists.landley.net<br>
<b>Subject:</b> Re: [Toybox] [PENDING] [fold.c] [Question]</font>
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<div class="PlainText">Hi,<br>
<br>
On 08/27/18 03:09, haroon maqsood wrote:<br>
> Hi Rob,<br>
> I started working on fold.c cleanup,<br>
> going through the code, and testing it out, i have a couple of questions.<br>
> <br>
> 1. gnu fold engulfs \n unconditionally i.e if there is a \n after the fold has<br>
> happened that redundant \n does not make it to the output , that kind of<br>
> makes sense but the posix spec only mentions carriage returns and only if<br>
> the -b option is not specified. (Note* That the current pending/fold outputs<br>
> an extra new line.)<br>
<br>
If a line is exactly the length that a newline would need to go after the last<br>
character, no additional newline should be added. If there is, that's a bug. If<br>
you're referring to a different situation, please give an example.<br>
<br>
> 2. the current fold implementation has unfold capability , that i think should<br>
> not be squeezed in fold (as of yet), my plan is to have unfold as a separate<br>
> utility that uses infrastructure from fold if necessary, or at least make<br>
> unfold as a config option, please share your thoughts on this.<br>
> 3. The tabstop thing is bit confusing for me, as the posix spec says "Tab stops<br>
> shall be at each column position such that n modulo 8 equals 1." ( from<br>
> this i understand that given the column the next column where the tab ends<br>
> should be a column whose modulo 8 returns 1 , kind of this pseudo code ?<br>
> where start is the current column. (am i understanding it right ?)<br>
> <br>
> int get_next_ts(int start)<br>
> {<br>
> if (start <= 1)<br>
> return 9;<br>
> <br>
> if ((start % 8) == 1)<br>
> return start;<br>
> <br>
> return get_next_ts(++start);<br>
> }<br>
<br>
Yes, this is correct. A more idiomatic algorithm would be:<br>
<br>
int get_next_ts(int start)<br>
{<br>
return ((start + 8) & -8) + 1;<br>
}<br>
<br>
> Haroon<br>
<br>
Samuel<br>
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