Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 670 insertions, 0 deletions

diff --git a/src/global/mail_addr_find.c b/src/global/mail_addr_find.c
new file mode 100644
index 0000000..d8b94fb
--- /dev/null
+++ b/src/global/mail_addr_find.c
@@ -0,0 +1,670 @@
+/*++
+/* NAME
+/*	mail_addr_find 3
+/* SUMMARY
+/*	generic address-based lookup
+/* SYNOPSIS
+/*	#include <mail_addr_find.h>
+/*
+/*	const char *mail_addr_find_int_to_ext(maps, address, extension)
+/*	MAPS	*maps;
+/*	const char *address;
+/*	char	**extension;
+/*
+/*	const char *mail_addr_find_opt(maps, address, extension, in_form,
+/*					query_form, out_form, strategy)
+/*	MAPS	*maps;
+/*	const char *address;
+/*	char	**extension;
+/*	int	in_form;
+/*	int	in_form;
+/*	int	out_form;
+/*	int	strategy;
+/* LEGACY SUPPORT
+/*	const char *mail_addr_find(maps, address, extension)
+/*	MAPS	*maps;
+/*	const char *address;
+/*	char	**extension;
+/*
+/*	const char *mail_addr_find_to_internal(maps, address, extension)
+/*	MAPS	*maps;
+/*	const char *address;
+/*	char	**extension;
+/*
+/*	const char *mail_addr_find_strategy(maps, address, extension)
+/*	MAPS	*maps;
+/*	const char *address;
+/*	char	**extension;
+/*	int	strategy;
+/* DESCRIPTION
+/*	mail_addr_find*() searches the specified maps for an entry with as
+/*	key the specified address, and derivations from that address.
+/*	It is up to the caller to specify its case sensitivity
+/*	preferences when it opens the maps.
+/*	The result is overwritten upon each call.
+/*
+/*	In the lookup table, the key is expected to be in external
+/*	form (as produced with the postmap command) and the value is
+/*	expected to be in external (quoted) form if it is an email
+/*	address. Override these assumptions with the query_form
+/*	and out_form arguments.
+/*
+/*	With mail_addr_find_int_to_ext(), the specified address is in
+/*	internal (unquoted) form, the query is made in external (quoted)
+/*	form, and the result is in the form found in the table (it is
+/*	not necessarily an email address). This version minimizes
+/*	internal/external (unquoted/quoted) conversions of the input,
+/*	query, extension, or result.
+/*
+/*	mail_addr_find_opt() gives more control, at the cost of
+/*	additional conversions between internal and external forms.
+/*	In particular, output conversion to internal form assumes
+/*	that the lookup result is an email address.
+/*
+/*	mail_addr_find() is used by legacy code that historically searched
+/*	with internal-form queries. The input is in internal form. It
+/*	searches with external-form queries first, and falls back to
+/*	internal-form queries if no result was found and the external
+/*	and internal forms differ. The result is external form (i.e. no
+/*	conversion).
+/*
+/*	mail_addr_find_to_internal() is like mail_addr_find() but assumes
+/*	that the lookup result is one external-form email address,
+/*	and converts it to internal form.
+/*
+/*	mail_addr_find_strategy() is like mail_addr_find() but overrides
+/*	the default search strategy for full and partial addresses.
+/*
+/*	Arguments:
+/* .IP maps
+/*	Dictionary search path (see maps(3)).
+/* .IP address
+/*	The address to be looked up.
+/* .IP extension
+/*	A null pointer, or the address of a pointer that is set to
+/*	the address of a dynamic memory copy of the address extension
+/*	that had to be chopped off in order to match the lookup tables.
+/*	The copy includes the recipient address delimiter.
+/*	The copy is in internal (unquoted) form.
+/*	The caller is expected to pass the copy to myfree().
+/* .IP query_form
+/*	The address form to use for database queries: one of
+/*	MA_FORM_INTERNAL (unquoted form), MA_FORM_EXTERNAL (quoted form),
+/*	MA_FORM_EXTERNAL_FIRST (external form, then internal form if the
+/*	external and internal forms differ), or MA_FORM_INTERNAL_FIRST
+/*	(internal form, then external form if the internal and external
+/*	forms differ).
+/* .IP in_form .IP out_form
+/*	Input and output address forms, one of MA_FORM_INTERNAL (unquoted
+/*	form), or MA_FORM_EXTERNAL (quoted form).
+/* .IP strategy
+/*	The lookup strategy for full and partial addresses, specified
+/*	as the binary OR of one or more of the following. These lookups
+/*	are implemented in the order as listed below.
+/* .RS
+/* .IP MA_FIND_DEFAULT
+/*	A convenience alias for (MA_FIND_FULL |
+/*	MA_FIND_NOEXT | MA_FIND_LOCALPART_IF_LOCAL |
+/*	MA_FIND_AT_DOMAIN).
+/* .IP MA_FIND_FULL
+/*	Look up the full email address.
+/* .IP MA_FIND_NOEXT
+/*	If no match was found, and the address has a localpart extension,
+/*	look up the address after removing the extension.
+/* .IP MA_FIND_LOCALPART_IF_LOCAL
+/*	If no match was found, and the domain matches myorigin,
+/*	mydestination, or any inet_interfaces or proxy_interfaces IP
+/*	address, look up the localpart.  If no match was found, and the
+/*	address has a localpart extension, repeat the same query after
+/*	removing the extension unless MA_FIND_NOEXT is specified.
+/* .IP MA_FIND_LOCALPART_AT_IF_LOCAL
+/*	As above, but using the localpart@ instead.
+/* .IP MA_FIND_AT_DOMAIN
+/*	If no match was found, look up the @domain without localpart.
+/* .IP MA_FIND_DOMAIN
+/*	If no match was found, look up the domain without localpart.
+/* .IP MA_FIND_PDMS
+/*	When used with MA_FIND_DOMAIN, the domain also matches subdomains.
+/* .IP MA_FIND_PDDMDS
+/*	When used with MA_FIND_DOMAIN, dot-domain also matches
+/*	dot-subdomains.
+/* .IP MA_FIND_LOCALPART_AT
+/*	If no match was found, look up the localpart@, regardless of
+/*	the domain content.
+/* .RE
+/* DIAGNOSTICS
+/*	The maps->error value is non-zero when the lookup failed due to
+/*	a non-permanent error.
+/* SEE ALSO
+/*	maps(3), multi-dictionary search resolve_local(3), recognize
+/*	local system
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <name_mask.h>
+#include <dict.h>
+#include <stringops.h>
+#include <mymalloc.h>
+#include <vstring.h>
+
+/* Global library. */
+
+#include <mail_params.h>
+#include <strip_addr.h>
+#include <mail_addr_find.h>
+#include <resolve_local.h>
+#include <quote_822_local.h>
+
+/* Application-specific. */
+
+#define STR	vstring_str
+
+#ifdef TEST
+
+static const NAME_MASK strategy_table[] = {
+    "full", MA_FIND_FULL,
+    "noext", MA_FIND_NOEXT,
+    "localpart_if_local", MA_FIND_LOCALPART_IF_LOCAL,
+    "localpart_at_if_local", MA_FIND_LOCALPART_AT_IF_LOCAL,
+    "at_domain", MA_FIND_AT_DOMAIN,
+    "domain", MA_FIND_DOMAIN,
+    "pdms", MA_FIND_PDMS,
+    "pddms", MA_FIND_PDDMDS,
+    "localpart_at", MA_FIND_LOCALPART_AT,
+    "default", MA_FIND_DEFAULT,
+    0, -1,
+};
+
+/* strategy_from_string - symbolic strategy flags to internal form */
+
+static int strategy_from_string(const char *strategy_string)
+{
+    return (name_mask_delim_opt("strategy_from_string", strategy_table,
+				strategy_string, "|",
+				NAME_MASK_WARN | NAME_MASK_ANY_CASE));
+}
+
+/* strategy_to_string - internal form to symbolic strategy flags */
+
+static const char *strategy_to_string(VSTRING *res_buf, int strategy_mask)
+{
+    static VSTRING *my_buf;
+
+    if (res_buf == 0 && (res_buf = my_buf) == 0)
+	res_buf = my_buf = vstring_alloc(20);
+    return (str_name_mask_opt(res_buf, "strategy_to_string",
+			      strategy_table, strategy_mask,
+			      NAME_MASK_WARN | NAME_MASK_PIPE));
+}
+
+#endif
+
+ /*
+  * Specify what keys are partial or full, to avoid matching partial
+  * addresses with regular expressions.
+  */
+#define FULL	0
+#define PARTIAL	DICT_FLAG_FIXED
+
+/* find_addr - helper to search maps with the right query form */
+
+static const char *find_addr(MAPS *path, const char *address, int flags,
+	             int with_domain, int query_form, VSTRING *ext_addr_buf)
+{
+    const char *result;
+
+#define SANS_DOMAIN	0
+#define WITH_DOMAIN	1
+
+    switch (query_form) {
+
+	/*
+	 * Query with external-form (quoted) address. The code looks a bit
+	 * unusual to emphasize the symmetry with the other cases.
+	 */
+    case MA_FORM_EXTERNAL:
+    case MA_FORM_EXTERNAL_FIRST:
+	quote_822_local_flags(ext_addr_buf, address,
+			      with_domain ? QUOTE_FLAG_DEFAULT :
+			    QUOTE_FLAG_DEFAULT | QUOTE_FLAG_BARE_LOCALPART);
+	result = maps_find(path, STR(ext_addr_buf), flags);
+	if (result != 0 || path->error != 0
+	    || query_form != MA_FORM_EXTERNAL_FIRST
+	    || strcmp(address, STR(ext_addr_buf)) == 0)
+	    break;
+	result = maps_find(path, address, flags);
+	break;
+
+	/*
+	 * Query with internal-form (unquoted) address. The code looks a bit
+	 * unusual to emphasize the symmetry with the other cases.
+	 */
+    case MA_FORM_INTERNAL:
+    case MA_FORM_INTERNAL_FIRST:
+	result = maps_find(path, address, flags);
+	if (result != 0 || path->error != 0
+	    || query_form != MA_FORM_INTERNAL_FIRST)
+	    break;
+	quote_822_local_flags(ext_addr_buf, address,
+			      with_domain ? QUOTE_FLAG_DEFAULT :
+			    QUOTE_FLAG_DEFAULT | QUOTE_FLAG_BARE_LOCALPART);
+	if (strcmp(address, STR(ext_addr_buf)) == 0)
+	    break;
+	result = maps_find(path, STR(ext_addr_buf), flags);
+	break;
+
+	/*
+	 * Can't happen.
+	 */
+    default:
+	msg_panic("mail_addr_find: bad query_form: %d", query_form);
+    }
+    return (result);
+}
+
+/* find_local - search on localpart info */
+
+static const char *find_local(MAPS *path, char *ratsign, int rats_offs,
+			              char *int_full_key, char *int_bare_key,
+		              int query_form, char **extp, char **saved_ext,
+			              VSTRING *ext_addr_buf)
+{
+    const char *myname = "mail_addr_find";
+    const char *result;
+    int     with_domain;
+    int     saved_ch;
+
+    /*
+     * This code was ripped from the middle of a function so that it can be
+     * reused multiple times, that's why the interface makes little sense.
+     */
+    with_domain = rats_offs ? WITH_DOMAIN : SANS_DOMAIN;
+
+    saved_ch = *(unsigned char *) (ratsign + rats_offs);
+    *(ratsign + rats_offs) = 0;
+    result = find_addr(path, int_full_key, PARTIAL, with_domain,
+		       query_form, ext_addr_buf);
+    *(ratsign + rats_offs) = saved_ch;
+    if (result == 0 && path->error == 0 && int_bare_key != 0) {
+	if ((ratsign = strrchr(int_bare_key, '@')) == 0)
+	    msg_panic("%s: bare key botch", myname);
+	saved_ch = *(unsigned char *) (ratsign + rats_offs);
+	*(ratsign + rats_offs) = 0;
+	if ((result = find_addr(path, int_bare_key, PARTIAL, with_domain,
+				query_form, ext_addr_buf)) != 0
+	    && extp != 0) {
+	    *extp = *saved_ext;
+	    *saved_ext = 0;
+	}
+	*(ratsign + rats_offs) = saved_ch;
+    }
+    return result;
+}
+
+/* mail_addr_find_opt - map a canonical address */
+
+const char *mail_addr_find_opt(MAPS *path, const char *address, char **extp,
+			               int in_form, int query_form,
+			               int out_form, int strategy)
+{
+    const char *myname = "mail_addr_find";
+    VSTRING *ext_addr_buf = 0;
+    VSTRING *int_addr_buf = 0;
+    const char *int_addr;
+    static VSTRING *int_result = 0;
+    const char *result;
+    char   *ratsign = 0;
+    char   *int_full_key;
+    char   *int_bare_key;
+    char   *saved_ext;
+    int     rc = 0;
+
+    /*
+     * Optionally convert the address from external form.
+     */
+    if (in_form == MA_FORM_EXTERNAL) {
+	int_addr_buf = vstring_alloc(100);
+	unquote_822_local(int_addr_buf, address);
+	int_addr = STR(int_addr_buf);
+    } else {
+	int_addr = address;
+    }
+    if (query_form == MA_FORM_EXTERNAL_FIRST
+	|| query_form == MA_FORM_EXTERNAL)
+	ext_addr_buf = vstring_alloc(100);
+
+    /*
+     * Initialize.
+     */
+    int_full_key = mystrdup(int_addr);
+    if (*var_rcpt_delim == 0 || (strategy & MA_FIND_NOEXT) == 0) {
+	int_bare_key = saved_ext = 0;
+    } else {
+	/* XXX This could be done after user+foo@domain fails. */
+	int_bare_key =
+	    strip_addr_internal(int_full_key, &saved_ext, var_rcpt_delim);
+    }
+
+    /*
+     * Try user+foo@domain and user@domain.
+     */
+    if ((strategy & MA_FIND_FULL) != 0) {
+	result = find_addr(path, int_full_key, FULL, WITH_DOMAIN,
+			   query_form, ext_addr_buf);
+    } else {
+	result = 0;
+	path->error = 0;
+    }
+
+    if (result == 0 && path->error == 0 && int_bare_key != 0
+	&& (result = find_addr(path, int_bare_key, PARTIAL, WITH_DOMAIN,
+			       query_form, ext_addr_buf)) != 0
+	&& extp != 0) {
+	*extp = saved_ext;
+	saved_ext = 0;
+    }
+
+    /*
+     * Try user+foo if the domain matches user+foo@$myorigin,
+     * user+foo@$mydestination or user+foo@[${proxy,inet}_interfaces]. Then
+     * try with +foo stripped off.
+     */
+    if (result == 0 && path->error == 0
+	&& (ratsign = strrchr(int_full_key, '@')) != 0
+	&& (strategy & (MA_FIND_LOCALPART_IF_LOCAL
+			| MA_FIND_LOCALPART_AT_IF_LOCAL)) != 0) {
+	if (strcasecmp_utf8(ratsign + 1, var_myorigin) == 0
+	    || (rc = resolve_local(ratsign + 1)) > 0) {
+	    if ((strategy & MA_FIND_LOCALPART_IF_LOCAL) != 0)
+		result = find_local(path, ratsign, 0, int_full_key,
+				 int_bare_key, query_form, extp, &saved_ext,
+				    ext_addr_buf);
+	    if (result == 0 && path->error == 0
+		&& (strategy & MA_FIND_LOCALPART_AT_IF_LOCAL) != 0)
+		result = find_local(path, ratsign, 1, int_full_key,
+				 int_bare_key, query_form, extp, &saved_ext,
+				    ext_addr_buf);
+	} else if (rc < 0)
+	    path->error = rc;
+    }
+
+    /*
+     * Try @domain.
+     */
+    if (result == 0 && path->error == 0 && ratsign != 0
+	&& (strategy & MA_FIND_AT_DOMAIN) != 0)
+	result = maps_find(path, ratsign, PARTIAL);
+
+    /*
+     * Try domain (optionally, subdomains).
+     */
+    if (result == 0 && path->error == 0 && ratsign != 0
+	&& (strategy & MA_FIND_DOMAIN) != 0) {
+	const char *name;
+	const char *next;
+
+	if ((strategy & MA_FIND_PDMS) && (strategy & MA_FIND_PDDMDS))
+	    msg_warn("mail_addr_find_opt: do not specify both "
+		     "MA_FIND_PDMS and MA_FIND_PDDMDS");
+	for (name = ratsign + 1; *name != 0; name = next) {
+	    if ((result = maps_find(path, name, PARTIAL)) != 0
+		|| path->error != 0
+		|| (strategy & (MA_FIND_PDMS | MA_FIND_PDDMDS)) == 0
+		|| (next = strchr(name + 1, '.')) == 0)
+		break;
+	    if ((strategy & MA_FIND_PDDMDS) == 0)
+		next++;
+	}
+    }
+
+    /*
+     * Try localpart@ even if the domain is not local.
+     */
+    if ((strategy & MA_FIND_LOCALPART_AT) != 0 \
+	&&result == 0 && path->error == 0)
+	result = find_local(path, ratsign, 1, int_full_key,
+			    int_bare_key, query_form, extp, &saved_ext,
+			    ext_addr_buf);
+
+    /*
+     * Optionally convert the result to internal form. The lookup result is
+     * supposed to be one external-form email address.
+     */
+    if (result != 0 && out_form == MA_FORM_INTERNAL) {
+	if (int_result == 0)
+	    int_result = vstring_alloc(100);
+	unquote_822_local(int_result, result);
+	result = STR(int_result);
+    }
+
+    /*
+     * Clean up.
+     */
+    if (msg_verbose)
+	msg_info("%s: %s -> %s", myname, address,
+		 result ? result :
+		 path->error ? "(try again)" :
+		 "(not found)");
+    myfree(int_full_key);
+    if (int_bare_key)
+	myfree(int_bare_key);
+    if (saved_ext)
+	myfree(saved_ext);
+    if (int_addr_buf)
+	vstring_free(int_addr_buf);
+    if (ext_addr_buf)
+	vstring_free(ext_addr_buf);
+    return (result);
+}
+
+#ifdef TEST
+
+ /*
+  * Proof-of-concept test program. Read an address and expected results from
+  * stdin, and warn about any discrepancies.
+  */
+#include <ctype.h>
+#include <stdlib.h>
+
+#include <vstream.h>
+#include <vstring_vstream.h>
+#include <mail_params.h>
+
+static NORETURN usage(const char *progname)
+{
+    msg_fatal("usage: %s [-v]", progname);
+}
+
+int     main(int argc, char **argv)
+{
+    VSTRING *buffer = vstring_alloc(100);
+    char   *bp;
+    MAPS   *path = 0;
+    const char *result;
+    char   *extent;
+    char   *cmd;
+    char   *in_field;
+    char   *query_field;
+    char   *out_field;
+    char   *strategy_field;
+    char   *key_field;
+    char   *expect_res;
+    char   *expect_ext;
+    int     in_form;
+    int     query_form;
+    int     out_form;
+    int     strategy_flags;
+    int     ch;
+    int     errs = 0;
+
+    /*
+     * Parse JCL.
+     */
+    while ((ch = GETOPT(argc, argv, "v")) > 0) {
+	switch (ch) {
+	case 'v':
+	    msg_verbose++;
+	    break;
+	default:
+	    usage(argv[0]);
+	}
+    }
+    if (argc != optind)
+	usage(argv[0]);
+
+    /*
+     * Initialize.
+     */
+#define UPDATE(var, val) do { myfree(var); var = mystrdup(val); } while (0)
+
+    mail_params_init();
+
+    /*
+     * TODO: move these assignments into the read/eval loop.
+     */
+    UPDATE(var_rcpt_delim, "+");
+    UPDATE(var_mydomain, "localdomain");
+    UPDATE(var_myorigin, "localdomain");
+    UPDATE(var_mydest, "localhost.localdomain");
+    while (vstring_fgets_nonl(buffer, VSTREAM_IN)) {
+	bp = STR(buffer);
+	if (msg_verbose)
+	    msg_info("> %s", bp);
+	if ((cmd = mystrtok(&bp, CHARS_SPACE)) == 0 || *cmd == '#')
+	    continue;
+	while (ISSPACE(*bp))
+	    bp++;
+
+	/*
+	 * Visible comment.
+	 */
+	if (strcmp(cmd, "echo") == 0) {
+	    vstream_printf("%s\n", bp);
+	}
+
+	/*
+	 * Open maps.
+	 */
+	else if (strcmp(cmd, "maps") == 0) {
+	    if (path)
+		maps_free(path);
+	    path = maps_create(argv[0], bp, DICT_FLAG_LOCK
+			     | DICT_FLAG_FOLD_FIX | DICT_FLAG_UTF8_REQUEST);
+	    vstream_printf("%s\n", bp);
+	    continue;
+	}
+
+	/*
+	 * Lookup and verify.
+	 */
+	else if (path && strcmp(cmd, "test") == 0) {
+
+	    /*
+	     * Parse the input and expectations.
+	     */
+	    /* internal, external. */
+	    if ((in_field = mystrtok(&bp, ":")) == 0)
+		msg_fatal("no input form");
+	    if ((in_form = mail_addr_form_from_string(in_field)) < 0)
+		msg_fatal("bad input form: '%s'", in_field);
+	    if ((query_field = mystrtok(&bp, ":")) == 0)
+		msg_fatal("no query form");
+	    /* internal, external, external-first. */
+	    if ((query_form = mail_addr_form_from_string(query_field)) < 0)
+		msg_fatal("bad query form: '%s'", query_field);
+	    if ((out_field = mystrtok(&bp, ":")) == 0)
+		msg_fatal("no output form");
+	    /* internal, external. */
+	    if ((out_form = mail_addr_form_from_string(out_field)) < 0)
+		msg_fatal("bad output form: '%s'", out_field);
+	    if ((strategy_field = mystrtok(&bp, ":")) == 0)
+		msg_fatal("no strategy field");
+	    if ((strategy_flags = strategy_from_string(strategy_field)) < 0)
+		msg_fatal("bad strategy field: '%s'", strategy_field);
+	    if ((key_field = mystrtok(&bp, ":")) == 0)
+		msg_fatal("no search key");
+	    expect_res = mystrtok(&bp, ":");
+	    expect_ext = mystrtok(&bp, ":");
+	    if (mystrtok(&bp, ":") != 0)
+		msg_fatal("garbage after extension field");
+
+	    /*
+	     * Lookups.
+	     */
+	    extent = 0;
+	    result = mail_addr_find_opt(path, key_field, &extent,
+					in_form, query_form, out_form,
+					strategy_flags);
+	    vstream_printf("%s:%s -%s-> %s:%s (%s)\n",
+	      in_field, key_field, query_field, out_field, result ? result :
+			   path->error ? "(try again)" :
+			 "(not found)", extent ? extent : "null extension");
+	    vstream_fflush(VSTREAM_OUT);
+
+	    /*
+	     * Enforce expectations.
+	     */
+	    if (expect_res && result) {
+		if (strcmp(expect_res, result) != 0) {
+		    msg_warn("expect result '%s' but got '%s'", expect_res, result);
+		    errs = 1;
+		    if (expect_ext && extent) {
+			if (strcmp(expect_ext, extent) != 0)
+			    msg_warn("expect extension '%s' but got '%s'",
+				     expect_ext, extent);
+			errs = 1;
+		    } else if (expect_ext && !extent) {
+			msg_warn("expect extension '%s' but got none", expect_ext);
+			errs = 1;
+		    } else if (!expect_ext && extent) {
+			msg_warn("expect no extension but got '%s'", extent);
+			errs = 1;
+		    }
+		}
+	    } else if (expect_res && !result) {
+		msg_warn("expect result '%s' but got none", expect_res);
+		errs = 1;
+	    } else if (!expect_res && result) {
+		msg_warn("expected no result but got '%s'", result);
+		errs = 1;
+	    }
+	    vstream_fflush(VSTREAM_OUT);
+	    if (extent)
+		myfree(extent);
+	}
+
+	/*
+	 * Unknown request.
+	 */
+	else {
+	    msg_warn("bad request: %s", cmd);
+	}
+    }
+    vstring_free(buffer);
+
+    maps_free(path);
+    return (errs != 0);
+}
+
+#endif