| # strndup.m4 serial 22 |
| dnl Copyright (C) 2002-2003, 2005-2019 Free Software Foundation, 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_STRNDUP], |
| [ |
| dnl Persuade glibc <string.h> to declare strndup(). |
| AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
| |
| AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles |
| AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS]) |
| AC_CHECK_DECLS_ONCE([strndup]) |
| AC_CHECK_FUNCS_ONCE([strndup]) |
| if test $ac_cv_have_decl_strndup = no; then |
| HAVE_DECL_STRNDUP=0 |
| fi |
| |
| if test $ac_cv_func_strndup = yes; then |
| HAVE_STRNDUP=1 |
| # AIX 4.3.3, AIX 5.1 have a function that fails to add the terminating '\0'. |
| AC_CACHE_CHECK([for working strndup], [gl_cv_func_strndup_works], |
| [AC_RUN_IFELSE([ |
| AC_LANG_PROGRAM([[#include <string.h> |
| #include <stdlib.h>]], [[ |
| #if !HAVE_DECL_STRNDUP |
| extern |
| #ifdef __cplusplus |
| "C" |
| #endif |
| char *strndup (const char *, size_t); |
| #endif |
| int result; |
| char *s; |
| s = strndup ("some longer string", 15); |
| free (s); |
| s = strndup ("shorter string", 13); |
| result = s[13] != '\0'; |
| free (s); |
| return result;]])], |
| [gl_cv_func_strndup_works=yes], |
| [gl_cv_func_strndup_works=no], |
| [ |
| changequote(,)dnl |
| case $host_os in |
| aix | aix[3-6]*) gl_cv_func_strndup_works="guessing no";; |
| *) gl_cv_func_strndup_works="guessing yes";; |
| esac |
| changequote([,])dnl |
| ])]) |
| case $gl_cv_func_strndup_works in |
| *no) REPLACE_STRNDUP=1 ;; |
| esac |
| else |
| HAVE_STRNDUP=0 |
| fi |
| ]) |