# getline.m4 serial 30

dnl Copyright (C) 1998-2003, 2005-2007, 2009-2020 Free Software Foundation,

dnl Inc.

dnl

dnl This file is free software; the Free Software Foundation

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

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

AC_PREREQ([2.59])

dnl See if there's a working, system-supplied version of the getline function.

dnl We can't just do AC_REPLACE_FUNCS([getline]) because some systems

dnl have a function by that name in -linet that doesn't have anything

dnl to do with the function we need.

AC_DEFUN([gl_FUNC_GETLINE],

[

  AC_REQUIRE([gl_STDIO_H_DEFAULTS])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  dnl Persuade glibc <stdio.h> to declare getline().

  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])

  AC_CHECK_DECLS_ONCE([getline])

  gl_getline_needs_run_time_check=no

  AC_CHECK_FUNC([getline],

                [dnl Found it in some library.  Verify that it works.

                 gl_getline_needs_run_time_check=yes],

                [am_cv_func_working_getline=no])

  if test $gl_getline_needs_run_time_check = yes; then

    AC_CACHE_CHECK([for working getline function],

      [am_cv_func_working_getline],

      [echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data

       AC_RUN_IFELSE([AC_LANG_SOURCE([[

#    include <stdio.h>

#    include <stdlib.h>

#    include <string.h>

    int main ()

    {

      FILE *in = fopen ("./conftest.data", "r");

      if (!in)

        return 1;

      {

        /* Test result for a NULL buffer and a zero size.

           Based on a test program from Karl Heuer.  */

        char *line = NULL;

        size_t siz = 0;

        int len = getline (&line, &siz, in);

        if (!(len == 4 && line && strcmp (line, "foo\n") == 0))

          { free (line); fclose (in); return 2; }

        free (line);

      }

      {

        /* Test result for a NULL buffer and a non-zero size.

           This crashes on FreeBSD 8.0.  */

        char *line = NULL;

        size_t siz = (size_t)(~0) / 4;

        if (getline (&line, &siz, in) == -1)

          { fclose (in); return 3; }

        free (line);

      }

      fclose (in);

      return 0;

    }

    ]])],

         [am_cv_func_working_getline=yes],

         [am_cv_func_working_getline=no],

         [dnl We're cross compiling.

          dnl Guess it works on glibc2 systems and musl systems.

          AC_EGREP_CPP([Lucky GNU user],

            [

#include <features.h>

#ifdef __GNU_LIBRARY__

 #if (__GLIBC__ >= 2) && !defined __UCLIBC__

  Lucky GNU user

 #endif

#endif

            ],

            [am_cv_func_working_getline="guessing yes"],

            [case "$host_os" in

               *-musl*) am_cv_func_working_getline="guessing yes" ;;

               *)       am_cv_func_working_getline="$gl_cross_guess_normal" ;;

             esac

            ])

         ])

      ])

  fi

  if test $ac_cv_have_decl_getline = no; then

    HAVE_DECL_GETLINE=0

  fi

  case "$am_cv_func_working_getline" in

    *yes) ;;

    *)

      dnl Set REPLACE_GETLINE always: Even if we have not found the broken

      dnl getline function among $LIBS, it may exist in libinet and the

      dnl executable may be linked with -linet.

      REPLACE_GETLINE=1

      ;;

  esac

])

# Prerequisites of lib/getline.c.

AC_DEFUN([gl_PREREQ_GETLINE],

[

  :

])