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POHow to test whether FILE exists and is readable in D
 

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  1. POHow to test whether FILE exists and is readable in D
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    <p>How do you determine if a file is readable in D? I've searched both google and D's docs and stuff multiple times--I've also searched SO multiple times--but I haven't been able to find <strong>anything</strong> on testing whether a given file is readable. I know how to do it, theoretically, in C using __freadable--I even tried to make an external call to __freadable in D but I got the following linking error: </p> <pre><code>ldc2 -O2 -dw -g -wi -I/usr/include/stdio_ext.h -c ket.d ket.o ldc2 -O2 -dw -g -wi -I/usr/include/stdio_ext.h -ofket ket.o ket.o: In function `_Dmain': /home/hav3lock/sy.l/repos/pub_rel/ket/ket.d:47: undefined reference to `_D3ket4mainFAAyaZv11__freadableUPOS4core4stdc5stdio6_iobufZi' collect2: error: ld returned 1 exit status Error: /usr/bin/gcc failed with status: 1 make: *** [ket] Error 1 </code></pre> <p>I read some more on calling C stuff in D and apparently I'd need to rewrite the stdio_ext.h C header--where __freadable lives--as a D header or something like that, and that amount of work is beyond the scope of what I'm trying to do. </p> <p>I just want to be able to figure out if a given file is readable so that I can determine whether the file exists and if it is also readable all in one go. If I was writing this sucker in bash I'd just use</p> <pre><code>[[ -r FILE ]] </code></pre> <p>to test whether FILE exists and read permission to it is granted, but I just can't find out how to do the equivalent in D... any ideas? </p> <hr> <p>Tried using getAttributes, but D complains about:</p> <pre><code>no property 'getAttributes' for type 'File' </code></pre> <p>Here's how I'm using <em>getAttributes</em></p> <pre><code> auto file_a = File(proc_auto[hdex], "r"); writeln(file_a.getAttributes); </code></pre>
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    1. USAlexej Magura
    1. USAlexej Magura
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    1. COI also figured out how to utilize __freadable `extern (C) int __freadable(FILE *__fp); int Dfreadable(string string0) { auto file_a = File( string0, "r"); return __freadable(file_a.getFP); }` Then you just pass the name of the file that you want to check to 'Dfreadable()' and it'll tell you whether the given file is reabable or not. See 'man 3 __freadable' for more details.
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      1. USAlexej Magura
 

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