Grettings all, I've decided to delve a bit in to programming with XSUBs. I wrote the C code, and the associated xs code. Everything complies fine and for the most part, runs fine, too. However, I'd like to be able to return undef to perl in case of failure. The C function that I have is prototyped as such: 
char * rdw_read(FILE * input_file)

[download]
Also, while I'm at it, I'd like the corresponding perl code to be able to emulate the core readline function in so far as to be able to distinguish between scalar and array context.

thanks in advance,

thor

p.s. In case anyone was wondering, I'm trying to write code to deal with files that have rdw's in them.

In reply to Returning undef from XS code by thor

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.