Autocheck for snprintf, and use sprintf if it is not available.

Remove declaration of h_errno, since it is supposedly declared in netdb.h.
Changes proposed by itojun.

Modules/getaddrinfo.c

@@ -544,10 +544,6 @@ get_addr(hostname, af, res, pai, port0)
 	struct gai_afd *gai_afd;
 	int i, error = 0, h_error;
 	char *ap;
-#if !defined(INET6) && !defined(h_errno)
-	/* In winsock.h, h_errno is #defined as a function call. */
-	extern int h_errno;
-#endif
 
 	top = NULL;
 	sentinel.ai_next = NULL;

Modules/socketmodule.c

@@ -1789,9 +1789,6 @@ gethost_common(struct hostent *h, struct sockaddr *addr, int alen, int af)
 
 	if (h == NULL) {
 		/* Let's get real error message to return */
-#ifndef h_errno
-		extern int h_errno;
-#endif
 		PyH_Err(h_errno);
 		return NULL;
 	}
@@ -2348,7 +2345,11 @@ PySocket_getaddrinfo(PyObject *self, PyObject *args)
 		return NULL;
 	}
 	if (PyInt_Check(pobj)) {
+#ifndef HAVE_SNPRINTF
+		sprintf(pbuf, "%ld", PyInt_AsLong(pobj));
+#else
 		snprintf(pbuf, sizeof(pbuf), "%ld", PyInt_AsLong(pobj));
+#endif
 		pptr = pbuf;
 	} else if (PyString_Check(pobj)) {
 		pptr = PyString_AsString(pobj);
@@ -2419,7 +2420,11 @@ PySocket_getnameinfo(PyObject *self, PyObject *args)
 	n = PyArg_ParseTuple(sa, "si|ii", &hostp, &port, &flowinfo, scope_id);
 	if (n == 0)
 		goto fail;
+#ifdef HAVE_SPRINTF
 	snprintf(pbuf, sizeof(pbuf), "%d", port);
+#else
+	sprintf(pbuf, "%d", port);
+#endif
 	memset(&hints, 0, sizeof(hints));
 	hints.ai_family = PF_UNSPEC;
 	error = getaddrinfo(hostp, pbuf, &hints, &res);

config.h.in

@@ -509,6 +509,9 @@
 /* Define if you have the sigrelse function.  */
 #undef HAVE_SIGRELSE
 
+/* Define if you have the snprintf function.  */
+#undef HAVE_SNPRINTF
+
 /* Define if you have the statvfs function.  */
 #undef HAVE_STATVFS
 

configure

@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# From configure.in Revision: 1.232 
+# From configure.in Revision: 1.233 
 
 # Guess values for system-dependent variables and create Makefiles.
 # Generated automatically using autoconf version 2.13 
@@ -4519,7 +4519,7 @@ for ac_func in alarm chown clock confstr ctermid ctermid_r execv \
  nice pathconf pause plock poll pthread_init \
  putenv readlink \
  select setegid seteuid setgid \
- setlocale setregid setreuid setsid setpgid setuid setvbuf \
+ setlocale setregid setreuid setsid setpgid setuid setvbuf snprintf \
  sigaction siginterrupt sigrelse strftime strptime symlink sysconf \
  tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
  truncate uname waitpid _getpty getpriority

configure.in

@@ -1179,7 +1179,7 @@ AC_CHECK_FUNCS(alarm chown clock confstr ctermid ctermid_r execv \
  nice pathconf pause plock poll pthread_init \
  putenv readlink \
  select setegid seteuid setgid \
- setlocale setregid setreuid setsid setpgid setuid setvbuf \
+ setlocale setregid setreuid setsid setpgid setuid setvbuf snprintf \
  sigaction siginterrupt sigrelse strftime strptime symlink sysconf \
  tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
  truncate uname waitpid _getpty getpriority)