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1 # strndup.m4 serial 15
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2 dnl Copyright (C) 2002-2003, 2005-2008 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_STRNDUP],
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8 [
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9 dnl Persuade glibc <string.h> to declare strndup().
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10 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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11
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12 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
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13 AC_CHECK_DECLS_ONCE([strndup])
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14 if test $ac_cv_have_decl_strndup = no; then
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15 HAVE_DECL_STRNDUP=0
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16 fi
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17
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18 # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
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19 AC_CACHE_CHECK([for working strndup], gl_cv_func_strndup,
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20 [AC_RUN_IFELSE([
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21 AC_LANG_PROGRAM([[#include <string.h>
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22 #include <stdlib.h>]], [[
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23 #ifndef HAVE_DECL_STRNDUP
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24 extern char *strndup (const char *, size_t);
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25 #endif
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26 char *s;
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27 s = strndup ("some longer string", 15);
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28 free (s);
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29 s = strndup ("shorter string", 13);
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30 return s[13] != '\0';]])],
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31 [gl_cv_func_strndup=yes],
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32 [gl_cv_func_strndup=no],
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33 [AC_CHECK_FUNC([strndup],
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34 [AC_EGREP_CPP([too risky], [
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35 #ifdef _AIX
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36 too risky
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37 #endif
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38 ],
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39 [gl_cv_func_strndup=no],
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40 [gl_cv_func_strndup=yes])],
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41 [gl_cv_func_strndup=no])])])
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42 if test $gl_cv_func_strndup = yes; then
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43 AC_DEFINE([HAVE_STRNDUP], 1,
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44 [Define if you have the strndup() function and it works.])
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45 else
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46 HAVE_STRNDUP=0
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47 AC_LIBOBJ([strndup])
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48 gl_PREREQ_STRNDUP
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49 fi
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50 ])
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51
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52 # Prerequisites of lib/strndup.c.
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53 AC_DEFUN([gl_PREREQ_STRNDUP], [:])
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