| 1 | # strndup.m4 serial 11
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| 2 | dnl Copyright (C) 2002-2003, 2005-2006 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_GNU_SOURCE])
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| 11 |
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| 12 | AC_CHECK_DECLS_ONCE([strndup])
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| 13 |
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| 14 | # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'.
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| 15 | AC_CACHE_CHECK([for working strndup], gl_cv_func_strndup,
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| 16 | [AC_RUN_IFELSE([
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| 17 | AC_LANG_PROGRAM([#include <string.h>
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| 18 | #include <stdlib.h>], [[
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| 19 | #ifndef HAVE_DECL_STRNDUP
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| 20 | extern char *strndup (const char *, size_t);
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| 21 | #endif
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| 22 | char *s;
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| 23 | s = strndup ("some longer string", 15);
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| 24 | free (s);
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| 25 | s = strndup ("shorter string", 13);
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| 26 | return s[13] != '\0';]])],
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| 27 | [gl_cv_func_strndup=yes],
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| 28 | [gl_cv_func_strndup=no],
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| 29 | [AC_CHECK_FUNC([strndup],
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| 30 | [AC_EGREP_CPP([too risky], [
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| 31 | #ifdef _AIX
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| 32 | too risky
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| 33 | #endif
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| 34 | ],
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| 35 | [gl_cv_func_strndup=no],
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| 36 | [gl_cv_func_strndup=yes])],
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| 37 | [gl_cv_func_strndup=no])])])
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| 38 | if test $gl_cv_func_strndup = yes; then
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| 39 | AC_DEFINE([HAVE_STRNDUP], 1,
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| 40 | [Define if you have the strndup() function and it works.])
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| 41 | else
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| 42 | AC_LIBOBJ([strndup])
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| 43 | gl_PREREQ_STRNDUP
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| 44 | fi
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| 45 | ])
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| 46 |
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| 47 | # Prerequisites of lib/strndup.c.
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| 48 | AC_DEFUN([gl_PREREQ_STRNDUP], [:])
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