1 # strndup.m4 serial 16 2 dnl Copyright (C) 2002-2003, 2005-2009 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 dnl Persuade glibc <string.h> to declare strndup(). 10 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) 11 12 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) 13 AC_CHECK_DECLS_ONCE([strndup]) 14 if test $ac_cv_have_decl_strndup = no; then 15 HAVE_DECL_STRNDUP=0 16 fi 17 18 # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'. 19 AC_CACHE_CHECK([for working strndup], [gl_cv_func_strndup], 20 [AC_RUN_IFELSE([ 21 AC_LANG_PROGRAM([[#include <string.h> 22 #include <stdlib.h>]], [[ 23 #ifndef HAVE_DECL_STRNDUP 24 extern char *strndup (const char *, size_t); 25 #endif 26 char *s; 27 s = strndup ("some longer string", 15); 28 free (s); 29 s = strndup ("shorter string", 13); 30 return s[13] != '\0';]])], 31 [gl_cv_func_strndup=yes], 32 [gl_cv_func_strndup=no], 33 [AC_CHECK_FUNC([strndup], 34 [AC_EGREP_CPP([too risky], [ 35 #ifdef _AIX 36 too risky 37 #endif 38 ], 39 [gl_cv_func_strndup=no], 40 [gl_cv_func_strndup=yes])], 41 [gl_cv_func_strndup=no])])]) 42 if test $gl_cv_func_strndup = yes; then 43 AC_DEFINE([HAVE_STRNDUP], [1], 44 [Define if you have the strndup() function and it works.]) 45 else 46 HAVE_STRNDUP=0 47 AC_LIBOBJ([strndup]) 48 gl_PREREQ_STRNDUP 49 fi 50 ]) 51 52 # Prerequisites of lib/strndup.c. 53 AC_DEFUN([gl_PREREQ_STRNDUP], [:]) 54
