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Paul.Thieme@xxxxxxxxxxxxxxxxx wrote:
...
Everything works fine. My problem is I don't understand what
%str(%addr(d_name)) is doing and why it is needed.
Walking through the program in debug, I noticed that d_name has a value. I
changed the code to the "easier on the eyes" version which is simply taking
a 256 char field and truncating it in a 120 char field.
...
Paul, readdir() returns a null-terminated string in d_name. The x'00'
character is the null-terminator. In the debugger (see below), this
character looks like a blank, but you can see it in the hex output if
you use
eval d_name:x
The %STR builtin function looks for the null-terminator and ignores
everything after it.
It looks like both %STR and %SUBST are equally valid ways of handling
the output of readdir. (Assuming that it's impossible for a directory
name to be longer than 639.)
In this debugger session, you can see the '00' in the second line of the
hex listing for d_name:x
> EVAL d_name
D_NAME =
....5...10...15...20...25...30...
1 '/home/mydir/a.txt
> EVAL d_name:x
00000 61889694 856194A8 848999...
00010 A3004040 40404040 404040...
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