1# inet_ntop.m4 serial 21
2dnl Copyright (C) 2005-2006, 2008-2020 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7AC_DEFUN([gl_FUNC_INET_NTOP],
8[
9  AC_REQUIRE([gl_ARPA_INET_H_DEFAULTS])
10
11  dnl Persuade Solaris <arpa/inet.h> to declare inet_ntop.
12  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
13
14  AC_REQUIRE([AC_C_RESTRICT])
15
16  dnl Most platforms that provide inet_ntop define it in libc.
17  dnl Solaris 8..10 provide inet_ntop in libnsl instead.
18  dnl Solaris 2.6..7 provide inet_ntop in libresolv instead.
19  dnl Haiku provides it in -lnetwork.
20  dnl Native Windows provides it in -lws2_32 instead, with a declaration in
21  dnl <ws2tcpip.h>, and it uses stdcall calling convention, not cdecl
22  dnl (hence we cannot use AC_CHECK_FUNCS, AC_SEARCH_LIBS to find it).
23  HAVE_INET_NTOP=1
24  INET_NTOP_LIB=
25  gl_PREREQ_SYS_H_WINSOCK2
26  if test $HAVE_WINSOCK2_H = 1; then
27    dnl It needs to be overridden, because the stdcall calling convention
28    dnl is not compliant with POSIX.  Set REPLACE_INET_NTOP in order to avoid
29    dnl a name conflict at the linker level, even though the header file
30    dnl <ws2tcpip.h> declares inet_ntop only if _WIN32_WINNT >= 0x0600.
31    REPLACE_INET_NTOP=1
32    AC_CHECK_DECLS([inet_ntop],,, [[#include <ws2tcpip.h>]])
33    if test $ac_cv_have_decl_inet_ntop = yes; then
34      INET_NTOP_LIB="-lws2_32"
35    else
36      HAVE_DECL_INET_NTOP=0
37    fi
38  else
39    gl_save_LIBS=$LIBS
40    AC_SEARCH_LIBS([inet_ntop], [nsl resolv network], [],
41      [AC_CHECK_FUNCS([inet_ntop])
42       if test $ac_cv_func_inet_ntop = no; then
43         HAVE_INET_NTOP=0
44       fi
45      ])
46    LIBS=$gl_save_LIBS
47
48    if test "$ac_cv_search_inet_ntop" != "no" \
49       && test "$ac_cv_search_inet_ntop" != "none required"; then
50      INET_NTOP_LIB="$ac_cv_search_inet_ntop"
51    fi
52
53    AC_CHECK_HEADERS_ONCE([netdb.h])
54    AC_CHECK_DECLS([inet_ntop],,,
55      [[#include <arpa/inet.h>
56        #if HAVE_NETDB_H
57        # include <netdb.h>
58        #endif
59      ]])
60    if test $ac_cv_have_decl_inet_ntop = no; then
61      HAVE_DECL_INET_NTOP=0
62    fi
63  fi
64  AC_SUBST([INET_NTOP_LIB])
65])
66
67# Prerequisites of lib/inet_ntop.c.
68AC_DEFUN([gl_PREREQ_INET_NTOP], [
69  AC_REQUIRE([gl_SOCKET_FAMILIES])
70])
71