'packlist'/'unpackstring' in XS

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

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Re: 'packlist'/'unpackstring' in XS by BrowserUk (Patriarch) on Mar 13, 2017 at 21:48 UTC
XS for implementing these code: @data = unpack "C", $script;* How much do you know about C? Because the "equivalent of the above code in C makes no sense. A C string is already an array of bytes. You don't need to pack or unpack a string(array of unsigned char), just access the elements. If you do not understand enough C to understand that, you should think twice about using XS; cos it'll bite you in the arse. Hard. With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday' Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". The enemy of (IT) success is complexity. In the absence of evidence, opinion is indistinguishable from prejudice.	[reply]
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Re: 'packlist'/'unpackstring' in XS by stevieb (Canon) on Mar 13, 2017 at 20:38 UTC
Can you please describe in more detail what you're wanting to do here? Are you trying to pass this information into XS and wondering how to handle it there, or are you trying to retrieve data from XS and convert it within Perl?	[reply]
Re^2: 'packlist'/'unpackstring' in XS by Anonymous Monk on Mar 22, 2017 at 04:37 UTC
`char str = "Preved!!!"; char pat = "C"; dSP; PUTBACK; int n = unpackstring(pat, pat + 2, str, str + strlen(str), 0); SPAGAIN; AV array2 = POPs; printf("%d, %d\n", n, av_len(array2)); =>>> 9, 44939024` [download] array2 is not a array pointer after POPs...	[reply] [d/l]
Re^3: 'packlist'/'unpackstring' in XS by Anonymous Monk on Mar 22, 2017 at 04:46 UTC
Thank you all, I found a solution `for (int c = n - 1; c >= 0; c--) { int a = POPi; printf("%c\n", a); }` [download]	[reply] [d/l]
Re: 'packlist'/'unpackstring' in XS by AnomalousMonk (Archbishop) on Mar 13, 2017 at 21:31 UTC
Also, could you please provide a link to the "XS" module in which the `packlist()` and `unpackstring()` functions or methods (as I presume them to be) are defined? Just for those of us trying to follow along at home. Give a man a fish: `<%-{-{-{-<`	[reply] [d/l] [select]