# getdelim.m4 serial 15

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

AC_DEFUN([gl_FUNC_GETDELIM],

[

  AC_REQUIRE([gl_STDIO_H_DEFAULTS])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

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

  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])

  AC_CHECK_DECLS_ONCE([getdelim])

  AC_CHECK_FUNCS_ONCE([getdelim])

  if test $ac_cv_func_getdelim = yes; then

    HAVE_GETDELIM=1

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

    AC_CACHE_CHECK([for working getdelim function],

      [gl_cv_func_working_getdelim],

      [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 = getdelim (&line, &siz, '\n', 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 (getdelim (&line, &siz, '\n', in) == -1)

          { fclose (in); return 3; }

        free (line);

      }

      fclose (in);

      return 0;

    }

    ]])],

         [gl_cv_func_working_getdelim=yes],

         [gl_cv_func_working_getdelim=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

            ],

            [gl_cv_func_working_getdelim="guessing yes"],

            [case "$host_os" in

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

               *)       gl_cv_func_working_getdelim="$gl_cross_guess_normal" ;;

             esac

            ])

         ])

      ])

    case "$gl_cv_func_working_getdelim" in

      *yes) ;;

      *) REPLACE_GETDELIM=1 ;;

    esac

  else

    HAVE_GETDELIM=0

  fi

  if test $ac_cv_have_decl_getdelim = no; then

    HAVE_DECL_GETDELIM=0

  fi

])

# Prerequisites of lib/getdelim.c.

AC_DEFUN([gl_PREREQ_GETDELIM],

[

  AC_CHECK_FUNCS([flockfile funlockfile])

  AC_CHECK_DECLS([getc_unlocked])

])