mirror of https://gitee.com/openkylin/wget.git
59 lines
1.7 KiB
Plaintext
59 lines
1.7 KiB
Plaintext
# strndup.m4 serial 23
|
|
dnl Copyright (C) 2002-2003, 2005-2023 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_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
|
|
])
|