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Re: get rid of getpwent? (Was: cygwin-1.7.28 getpwent header declaration changes ?)


On 2/9/2014 11:16 AM, Corinna Vinschen wrote:
On Feb  9 17:10, Corinna Vinschen wrote:
On Feb  9 08:45, Warren Young wrote:
On Feb 7, 2014, at 10:51 AM, Warren Young <warren@etr-usa.com> wrote:

Here's a better check that doesn't give false positives:

    $ cat <<END > checkfile
    #!/bin/sh
    if egrep -q '_getgrent(32|64)' "$1" ; then echo $1 ; fi
    END
    $ find /bin -name \*.exe -exec ./checkfile {} \;

The strings(1) call got left out of that test.  Hereâs a working variant, which tests for getpwent() calls instead:

     $ cat <<END > checkfile
     if strings "$1" | egrep -q '^getpwent$' ; then echo $1 ; fi
     END
     $ find /bin -name \*.exe -exec sh checkfile {} \;

Alas, Vim *does* call this API.  Results:

It does so to evaluate a ~user in a path and I guess that's what other
apps do as well.  This is kind of weird since it would obviously not be
necessary to enumerate accounts for this functionality:

   if (~ in path)
     if (~ is solo)
       getpwuid(getuid ())
     else
       getpwname (username after the ~);

Huh, even though tcsh calls getpwent as well, this works fine:

   $ cd ~foo

with foo being some not yet cached user name.

However, with my current code this:

   $ cd ~<TAB>

only returns the cached user entries.

emacs uses getpwent (on systems that provide it) for a similar reason: to provide tab completion on commands that expect a user name.

Ken

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