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Re: query: how many use PHP for linux scripts [message #185958 is a reply to message #185954] Thu, 15 May 2014 15:26 Go to previous messageGo to previous message
Ben Bacarisse is currently offline  Ben Bacarisse
Messages: 82
Registered: November 2013
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Jasen Betts <jasen(at)xnet(dot)co(dot)nz> writes:

> On 2014-05-14, Ben Bacarisse <ben(dot)usenet(at)bsb(dot)me(dot)uk> wrote:
>> The Natural Philosopher <tnp(at)invalid(dot)invalid> writes:
>>
>>> On 13/05/14 21:35, Tim Streater wrote:
>> <snip>
>>>> I can't be arsed to fiddle around with C these days. Too much faffing
>>>> around with declarations - and no string handling to speak of either.
>>>>
>>>> Non-issues in PHP.
>>>>
>>> string handling is the chief reason I prefer C..
>>
>> That seems odd since PHP has almost every single low-level C string
>> function available to it. You can strspn and strncmp to your heart's
>> content in PHP. Pretty much the only ones missing are strcat and strcpy
>> but, surely, they can't be why you prefer C.
>>
>> A PHP translation of C string handling would inevitably be simpler since
>> there would be no need manage the storage. That's the biggest advantage
>> in my opinion, even if never used any of PHP's more complex string
>> manipulation.
>
> white program the reads a text file and swaps every pair of lines and writes
> a new file.

I'd go:

function write_line($fin, $fout)
{
while (($c = fgetc($fin)) !== false && fputs($fout, $c) && $c != "\n");
return $c !== false;
}

function skip_line($fin, $fout)
{
while (($c = fgetc($fin)) !== false && $c != "\n");
return $c !== false;
}

function write_swapped_pair($fin, $fout)
{
$here = ftell($fin);
skip_line($fin, $fout);
if (write_line($fin, $fout))
return fseek($fin, $here) == 0 &&
write_line($fin, $fout) &&
skip_line($fin, $fout);
else return false;
}

function write_swapped_lines($fin, $fout)
{
while (write_swapped_pair($fin, $fout));
}

the behaviour with an odd number of lines, and when then last line is
not properly terminated, was not given so I took the easiest option!

This is not much more than a translation of what I'd do in C, which in a
way was my point.

The main difference is exchanging the test for EOF to false which takes
a little care (!== rather than !=), but then testing for EOF in C takes
case (you must use the right type variable). I don't think this is a
counter-example, but it's possible I missed the point your were making.

--
Ben.
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