1 # strndup.m4 serial 6 2 dnl Copyright (C) 2002-2003, 2005-2006 Free Software Foundation, Inc. 3 dnl This file is free software; the Free Software Foundation 4 dnl gives unlimited permission to copy and/or distribute it, 5 dnl with or without modifications, as long as this notice is preserved. 6 7 AC_DEFUN([gl_FUNC_STRNDUP], 8 [ 9 AC_LIBSOURCES([strndup.c, strndup.h]) 10 11 dnl Persuade glibc <string.h> to declare strndup(). 12 AC_REQUIRE([AC_GNU_SOURCE]) 13 14 AC_CHECK_DECLS_ONCE([strndup]) 15 16 # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'. 17 AC_CACHE_CHECK([for working strndup], gl_cv_func_strndup, 18 [AC_RUN_IFELSE([ 19 AC_LANG_PROGRAM([#include <string.h>], [[ 20 #ifndef HAVE_DECL_STRNDUP 21 extern char *strndup (const char *, size_t); 22 #endif 23 char *s; 24 s = strndup ("some longer string", 15); 25 free (s); 26 s = strndup ("shorter string", 13); 27 return s[13] != '\0';]])], 28 [gl_cv_func_strndup=yes], 29 [gl_cv_func_strndup=no], 30 [AC_EGREP_CPP([too risky], [ 31 #ifdef _AIX 32 too risky 33 #endif 34 ], 35 [gl_cv_func_strndup=no], 36 [gl_cv_func_strndup=yes])])]) 37 if test $gl_cv_func_strndup = yes; then 38 AC_DEFINE([HAVE_STRNDUP], 1, 39 [Define if you have the strndup() function and it works.]) 40 else 41 AC_LIBOBJ([strndup]) 42 AC_DEFINE(strndup, rpl_strndup, 43 [Define to rpl_strndup if the replacement function should be used,]) 44 gl_PREREQ_STRNDUP 45 fi 46 ]) 47 48 # Prerequisites of lib/strndup.c. 49 AC_DEFUN([gl_PREREQ_STRNDUP], [:]) 50
