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diff --git a/src/smtp/smtp_misc.c b/src/smtp/smtp_misc.c
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+/*++
+/* NAME
+/* smtp_misc 3
+/* SUMMARY
+/* SMTP client address rewriting
+/* SYNOPSIS
+/* #include <smtp_addr.h>
+/*
+/* void smtp_rewrite_generic_internal(
+/* VSTRING *dst,
+/* const char *src);
+/*
+/* void smtp_quote_822_address_flags(
+/* VSTRING *dst,
+/* const char *src,
+/* int flags);
+/*
+/* void smtp_quote_821_address(
+/* VSTRING *dst,
+/* const char *src);
+/* DESCRIPTION
+/* smtp_rewrite_generic_internal() rewrites a non-empty address
+/* if generic mapping is enabled, otherwise copies it literally.
+/*
+/* smtp_quote_822_address_flags() is a wrapper around
+/* quote_822_local_flags(), except for the empty address which
+/* is copied literally.
+/*
+/* smtp_quote_821_address() is a wrapper around quote_821_local(),
+/* except for the empty address or with "smtp_quote_rfc821_envelope
+/* = no"; in those cases the address is copied literally.
+/* DIAGNOSTICS
+/* Fatal: out of memory.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*--*/
+
+ /*
+ * System library.
+ */
+#include <sys_defs.h>
+
+ /*
+ * Utility library.
+ */
+#include <vstring.h>
+
+ /*
+ * Global library.
+ */
+#include <ext_prop.h>
+#include <mail_params.h>
+#include <quote_821_local.h>
+#include <quote_822_local.h>
+
+ /*
+ * Application-specific.
+ */
+#include <smtp.h>
+
+/* smtp_rewrite_generic_internal - generic non-empty address rewriting */
+
+void smtp_rewrite_generic_internal(VSTRING *dst, const char *src)
+{
+ vstring_strcpy(dst, src);
+ if (*src && smtp_generic_maps)
+ smtp_map11_internal(dst, smtp_generic_maps,
+ smtp_ext_prop_mask & EXT_PROP_GENERIC);
+}
+
+/* smtp_quote_822_address_flags - quote non-empty header address */
+
+void smtp_quote_822_address_flags(VSTRING *dst, const char *src, int flags)
+{
+ if (*src) {
+ quote_822_local_flags(dst, src, flags);
+ } else if (flags & QUOTE_FLAG_APPEND) {
+ vstring_strcat(dst, src);
+ } else {
+ vstring_strcpy(dst, src);
+ }
+}
+
+/* smtp_quote_821_address - quote non-empty envelope address */
+
+void smtp_quote_821_address(VSTRING *dst, const char *src)
+{
+ if (*src && var_smtp_quote_821_env) {
+ quote_821_local(dst, src);
+ } else {
+ vstring_strcpy(dst, src);
+ }
+}