# strtok_r.m4 serial 15

dnl Copyright (C) 2002-2004, 2006-2007, 2009-2020 Free Software Foundation,

dnl Inc.

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_DEFUN([gl_FUNC_STRTOK_R],

[

  dnl The strtok_r() declaration in lib/string.in.h uses 'restrict'.

  AC_REQUIRE([AC_C_RESTRICT])

  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])

  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles

  AC_CHECK_FUNCS([strtok_r])

  if test $ac_cv_func_strtok_r = yes; then

    HAVE_STRTOK_R=1

    dnl glibc 2.7 has a bug in strtok_r that causes a segmentation fault

    dnl when the second argument to strtok_r is a constant string that has

    dnl exactly one byte and compiling with optimization.  This bug is, for

    dnl example, present in the glibc 2.7-18 package in Debian "lenny".

    dnl See <https://sourceware.org/bugzilla/show_bug.cgi?id=5614>.

    AC_CACHE_CHECK([whether strtok_r works], [gl_cv_func_strtok_r_works],

      [AC_RUN_IFELSE(

         [AC_LANG_PROGRAM([[

              #ifndef __OPTIMIZE__

              # define __OPTIMIZE__ 1

              #endif

              #undef __OPTIMIZE_SIZE__

              #undef __NO_INLINE__

              #include <stdlib.h>

              #include <string.h>

            ]],

            [[static const char dummy[] = "\177\01a";

              char delimiters[] = "xxxxxxxx";

              char *save_ptr = (char *) dummy;

              strtok_r (delimiters, "x", &save_ptr);

              strtok_r (NULL, "x", &save_ptr);

              return 0;

            ]])

         ],

         [gl_cv_func_strtok_r_works=yes],

         [gl_cv_func_strtok_r_works=no],

         [case "$host_os" in

                           # Guess no on glibc systems.

            *-gnu* | gnu*) gl_cv_func_strtok_r_works="guessing no" ;;

                           # Guess yes on native Windows.

            mingw*)        gl_cv_func_strtok_r_works="guessing yes" ;;

            *)             gl_cv_func_strtok_r_works="guessing yes" ;;

          esac

         ])

      ])

    case "$gl_cv_func_strtok_r_works" in

      *no)

        dnl We could set REPLACE_STRTOK_R=1 here, but it's only the macro

        dnl version in <bits/string2.h> which is wrong. The code compiled

        dnl into libc is fine.

        UNDEFINE_STRTOK_R=1

        ;;

    esac

  else

    HAVE_STRTOK_R=0

  fi

  AC_CHECK_DECLS_ONCE([strtok_r])

  if test $ac_cv_have_decl_strtok_r = no; then

    HAVE_DECL_STRTOK_R=0

  fi

])

# Prerequisites of lib/strtok_r.c.

AC_DEFUN([gl_PREREQ_STRTOK_R], [

  :

])