#serial 12

# Copyright (C) 2005-2007, 2009-2018 Free Software Foundation, Inc.

#

# This file is free software; the Free Software Foundation

# gives unlimited permission to copy and/or distribute it,

# with or without modifications, as long as this notice is preserved.

dnl From Derek Price

dnl

dnl Provide getlogin_r when the system lacks it.

dnl

AC_DEFUN([gl_FUNC_GETLOGIN_R],

[

  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])

  dnl Persuade glibc <unistd.h> to declare getlogin_r().

  dnl Persuade Solaris <unistd.h> to provide the POSIX compliant declaration of

  dnl getlogin_r().

  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])

  AC_CHECK_DECLS_ONCE([getlogin_r])

  if test $ac_cv_have_decl_getlogin_r = no; then

    HAVE_DECL_GETLOGIN_R=0

  fi

  AC_CHECK_FUNCS_ONCE([getlogin_r])

  if test $ac_cv_func_getlogin_r = no; then

    HAVE_GETLOGIN_R=0

  else

    HAVE_GETLOGIN_R=1

    dnl On Mac OS X 10.12 and OSF/1 5.1, getlogin_r returns a truncated result

    dnl if the buffer is not large enough.

    AC_REQUIRE([AC_CANONICAL_HOST])

    AC_CACHE_CHECK([whether getlogin_r works with small buffers],

      [gl_cv_func_getlogin_r_works],

      [

        dnl Initial guess, used when cross-compiling.

changequote(,)dnl

        case "$host_os" in

                          # Guess no on Mac OS X, OSF/1.

          darwin* | osf*) gl_cv_func_getlogin_r_works="guessing no" ;;

                          # Guess yes otherwise.

          *)              gl_cv_func_getlogin_r_works="guessing yes" ;;

        esac

changequote([,])dnl

        AC_RUN_IFELSE(

          [AC_LANG_SOURCE([[

#include <stddef.h>

#include <string.h>

#include <unistd.h>

#if !HAVE_DECL_GETLOGIN_R

extern

# ifdef __cplusplus

"C"

# endif

int getlogin_r (char *, size_t);

#endif

int

main (void)

{

  int result = 0;

  char buf[100];

  if (getlogin_r (buf, 0) == 0)

    result |= 1;

  if (getlogin_r (buf, 1) == 0)

    result |= 2;

  if (getlogin_r (buf, 100) == 0)

    {

      size_t n = strlen (buf);

      if (getlogin_r (buf, n) == 0)

        result |= 4;

    }

  return result;

}]])],

          [gl_cv_func_getlogin_r_works=yes],

          [gl_cv_func_getlogin_r_works=no],

          [:])

      ])

    case "$gl_cv_func_getlogin_r_works" in

      *yes) ;;

      *) REPLACE_GETLOGIN_R=1 ;;

    esac

  fi

])

AC_DEFUN([gl_PREREQ_GETLOGIN_R],

[

  AC_CHECK_DECLS_ONCE([getlogin])

])