=begin
なかだです。

Etc.each_passwdやEtc.each_groupというものを思いつきました。
また、別名としてEtc::Passwd.eachやEtc.::Group.eachも。

パスワードを設定していないユーザ名のリスト¶

Etc::Passwd.find_all {|u| u.passwd == ""}.map(&:name)

とか。

Index: ext/etc/etc.c

--- ext/etc/etc.c (revision 22104)
+++ ext/etc/etc.c (working copy)
@@ -187,4 +187,14 @@ passwd_iterate(void)
return Qnil;
}
+
+static void
+each_passwd(void)
+{

• if (passwd_blocking) {
• rb_raise(rb_eRuntimeError, "parallel passwd iteration");
• }
• passwd_blocking = Qtrue;
• rb_ensure(passwd_iterate, 0, passwd_ensure, 0);
  +}
  #endif

@@ -212,11 +222,7 @@ etc_passwd(VALUE obj)
rb_secure(4);
if (rb_block_given_p()) {

• if (passwd_blocking) {

•  rb_raise(rb_eRuntimeError, "parallel passwd iteration");
  

• }
• passwd_blocking = Qtrue;
• rb_ensure(passwd_iterate, 0, passwd_ensure, 0);

• each_passwd();
  }

• if (pw = getpwent()) {

• else if (pw = getpwent()) {
  return setup_passwd(pw);
  }
  @@ -225,4 +231,32 @@ etc_passwd(VALUE obj)
  }

+/* Iterates for each entry in the /etc/passwd file if a block is given.

• • If no block is given, returns the enumerator.
• • The code block is passed an Struct::Passwd struct; see getpwent above for
• • details.
• • Example:

• • require 'etc'
    

• • Etc.each_passwd {|u|
    

• •   puts u.name + " = " + u.gecos
    

• • }
    

• • Etc.each_passwd.collect {|u| u.gecos}
    

• • Etc::Passwd.collect {|u| u.gecos}
    

• */
  +static VALUE
  +etc_each_passwd(VALUE obj)
  +{
  +#ifdef HAVE_GETPWENT
• RETURN_ENUMERATOR(obj, 0, 0);
• each_passwd();
  +#endif
• return obj;
  +}

/* Resets the process of reading the /etc/passwd file, so that the next call

• to getpwent will return the first entry again.
  @@ -391,4 +425,14 @@ group_iterate(void)
  return Qnil;
  }

+static void
+each_group(void)
+{

• if (group_blocking) {
• rb_raise(rb_eRuntimeError, "parallel group iteration");
• }
• group_blocking = Qtrue;
• rb_ensure(group_iterate, 0, group_ensure, 0);
  +}
  #endif

@@ -416,11 +460,7 @@ etc_group(VALUE obj)
rb_secure(4);
if (rb_block_given_p()) {

• if (group_blocking) {

•  rb_raise(rb_eRuntimeError, "parallel group iteration");
  

• }
• group_blocking = Qtrue;
• rb_ensure(group_iterate, 0, group_ensure, 0);

• each_group();
  }

• if (grp = getgrent()) {

• else if (grp = getgrent()) {
  return setup_group(grp);
  }
  @@ -429,4 +469,32 @@ etc_group(VALUE obj)
  }

+/* Iterates for each entry in the /etc/group file if a block is given.

• • If no block is given, returns the enumerator.
• • The code block is passed an Struct::Group struct; see getpwent above for
• • details.
• • Example:

• • require 'etc'
    

• • Etc.each_group {|g|
    

• •   puts g.name + ": " + g.mem.join(', ')
    

• • }
    

• • Etc.each_group.collect {|g| g.name}
    

• • Etc::Group.select {|g| !g.mem.empty?}
    

• */
  +static VALUE
  +etc_each_group(VALUE obj)
  +{
  +#ifdef HAVE_GETPWENT
• RETURN_ENUMERATOR(obj, 0, 0);
• each_group();
  +#endif
• return obj;
  +}

/* Resets the process of reading the /etc/group file, so that the next call

• to getgrent will return the first entry again.
  @@ -505,8 +573,10 @@ Init_etc(void)
  rb_define_module_function(mEtc, "getpwent", etc_getpwent, 0);
  rb_define_module_function(mEtc, "passwd", etc_passwd, 0);

• rb_define_module_function(mEtc, "each_passwd", etc_each_passwd, 0);

  rb_define_module_function(mEtc, "getgrgid", etc_getgrgid, -1);
  rb_define_module_function(mEtc, "getgrnam", etc_getgrnam, 1);
  rb_define_module_function(mEtc, "group", etc_group, 0);

• rb_define_module_function(mEtc, "each_group", etc_each_group, 0);
  rb_define_module_function(mEtc, "setgrent", etc_setgrent, 0);
  rb_define_module_function(mEtc, "endgrent", etc_endgrent, 0);
  @@ -539,4 +609,6 @@ Init_etc(void)
  NULL);
  rb_define_const(mEtc, "Passwd", sPasswd);

• rb_extend_object(sPasswd, rb_mEnumerable);

• rb_define_singleton_method(sPasswd, "each", etc_each_passwd, 0);

#ifdef HAVE_GETGRENT
@@ -548,4 +620,6 @@ Init_etc(void)

  rb_define_const(mEtc, "Group", sGroup);

• rb_extend_object(sGroup, rb_mEnumerable);
• rb_define_singleton_method(sGroup, "each", etc_each_group, 0);
  #endif
  }
  

--
--- 僕の前にBugはない。
--- 僕の後ろにBugはできる。
中田 伸悦
=end