From 9c45d9ad13fdf439d44d7443ae75da15ea0223ed Mon Sep 17 00:00:00 2001
From: Sam Varshavchik
Date: Mon, 19 Aug 2013 16:39:41 -0400
Subject: Initial checkin

Imported from subversion report, converted to git. Updated all paths in
scripts and makefiles, reflecting the new directory hierarchy.
---
 rfc2045/rfc2045reply.c | 1667 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 1667 insertions(+)
 create mode 100644 rfc2045/rfc2045reply.c

(limited to 'rfc2045/rfc2045reply.c')

diff --git a/rfc2045/rfc2045reply.c b/rfc2045/rfc2045reply.c
new file mode 100644
index 0000000..0692fb0
--- /dev/null
+++ b/rfc2045/rfc2045reply.c
@@ -0,0 +1,1667 @@
+/*
+** Copyright 2000-2011 Double Precision, Inc.  See COPYING for
+** distribution information.
+*/
+
+#include "rfc2045_config.h"
+#include	"rfc2045.h"
+#include	"rfc2045src.h"
+#include	"rfc3676parser.h"
+#include	"rfc822/rfc2047.h"
+#include	"rfc2045charset.h"
+#include	"rfc822/rfc822.h"
+#include	"unicode/unicode.h"
+#include	<stdio.h>
+#include	<unistd.h>
+#include	<stdlib.h>
+#include	<string.h>
+#include	<ctype.h>
+
+
+extern void rfc2045_enomem();
+
+static int mkreply(struct rfc2045_mkreplyinfo *);
+static int mkforward(struct rfc2045_mkreplyinfo *);
+
+static void mksalutation_datefmt(const char *fmt_start,
+				 const char *fmt_end,
+				 const char *date,
+				 void (*callback_func)(const char *,
+						       size_t, void *),
+				 void *callback_arg)
+{
+	time_t t;
+
+	if (!fmt_start)
+	{
+		fmt_start="%a, %d %b %Y %H:%M:%S %z";
+		fmt_end=fmt_start + strlen(fmt_start);
+	}
+
+	if ((t=rfc822_parsedt(date)))
+	{
+		struct tm tmbuf;
+
+		if (localtime_r(&t, &tmbuf))
+		{
+			char *fmtstr=malloc(fmt_end-fmt_start + 1);
+
+			if (fmtstr)
+			{
+				char fmtbuf[1024];
+
+				memcpy(fmtstr, fmt_start, fmt_end - fmt_start);
+				fmtstr[fmt_end-fmt_start]=0;
+
+				fmtbuf[strftime(fmtbuf,
+						sizeof(fmtbuf)-1,
+						fmtstr, &tmbuf)]=0;
+
+				free(fmtstr);
+				(*callback_func)(fmtbuf, strlen(fmtbuf),
+						 callback_arg);
+				return;
+			}
+		}
+	}
+	(*callback_func)(date, strlen(date), callback_arg);
+}
+
+static void mksalutation_cb(const char *salutation_template,
+			    const char *newsgroup,
+			    const char *message_id,
+			    const char *newsgroups,
+			    const char *sender_addr,
+			    const char *sender_name,
+			    const char *date,
+			    const char *subject,
+
+			    void (*callback_func)(const char *, size_t, void *),
+			    void *callback_arg)
+{
+	const char *p;
+
+	for (p=salutation_template; *p; p++)
+	{
+		const char *fmt_start=0, *fmt_end=0;
+
+		if (*p != '%' || p[1] == '\0')
+		{
+			(*callback_func)( p, 1, callback_arg );
+			continue;
+		}
+
+		++p;
+
+		if (*p == '{')
+		{
+			fmt_start= ++p;
+
+			while (*p)
+			{
+				if (*p == '}')
+				{
+					fmt_end=p;
+					++p;
+					break;
+				}
+			}
+
+			if (!fmt_end)
+				continue;
+		}
+
+#define CBSTR(s) s, strlen(s), callback_arg
+
+		switch (*p)	{
+		case 'n':
+			(*callback_func)("\n", 1, callback_arg );
+			continue;
+		case 'C':
+			(*callback_func)(CBSTR(newsgroup));
+			break;
+		case 'i':
+			(*callback_func)(CBSTR(message_id));
+			break;
+		case 'N':
+			(*callback_func)(CBSTR(newsgroups));
+			break;
+		case 'f':
+			(*callback_func)(CBSTR(sender_addr));
+			break;
+		case 'F':
+			(*callback_func)(CBSTR(sender_name));
+			break;
+		case 'd':
+			mksalutation_datefmt(fmt_start,
+					     fmt_end,
+					     date,
+					     callback_func, callback_arg);
+			break;
+		case 's':
+			(*callback_func)(CBSTR(subject));
+			break;
+		default:
+			(*callback_func)(p, 1, callback_arg);
+			break;
+		}
+#undef CBSTR
+
+	}
+}
+
+static void mksal_count(const char *str,
+			size_t cnt,
+			void *arg)
+{
+	*(size_t *)arg += cnt;
+}
+
+static void mksal_save(const char *str,
+		       size_t cnt,
+		       void *arg)
+{
+	if (cnt)
+		memcpy(*(char **)arg, str, cnt);
+
+	*(char **)arg += cnt;
+}
+
+static char *mksalutation(const char *salutation_template,
+			  const char *newsgroup,
+			  const char *message_id,
+			  const char *newsgroups,
+			  const char *sender_addr,
+			  const char *sender_name,
+			  const char *date,
+			  const char *subject,
+			  const char *charset)
+{
+	size_t cnt;
+	char *p, *q;
+
+	char *subj_decoded=rfc822_display_hdrvalue_tobuf("subject", subject,
+							 charset, NULL, NULL);
+
+	if (!subj_decoded)
+		return NULL;
+
+	cnt=1;
+
+	mksalutation_cb(salutation_template,
+			newsgroup,
+			message_id,
+			newsgroups,
+			sender_addr,
+			sender_name,
+			date,
+			subj_decoded,
+			mksal_count, &cnt);
+
+	p=q=malloc(cnt);
+
+	if (!p)
+	{
+		free(subj_decoded);
+		return NULL;
+	}
+
+	mksalutation_cb(salutation_template,
+			newsgroup,
+			message_id,
+			newsgroups,
+			sender_addr,
+			sender_name,
+			date,
+			subj_decoded,
+			mksal_save, &q);
+	*q=0;
+
+	free(subj_decoded);
+	return p;
+}
+
+
+int rfc2045_makereply(struct rfc2045_mkreplyinfo *ri)
+{
+	if (strcmp(ri->replymode, "forward") == 0
+	    || strcmp(ri->replymode, "forwardatt") == 0)
+		return (mkforward(ri));
+
+	return (mkreply(ri));
+}
+
+struct replyinfostruct {
+
+	struct rfc2045_mkreplyinfo *ri;
+	rfc3676_parser_t parser;
+
+	size_t quote_level_adjust;
+	size_t quote_level;
+	int start_line;
+	int isflowed;
+	size_t trailing_spaces;
+	libmail_u_convert_handle_t u_handle;
+
+};
+
+/*
+** Pass original content to the RFC 3676 parser
+*/
+
+static int quotereply(const char *p, size_t l, void *voidptr)
+{
+	struct replyinfostruct *ris=(struct replyinfostruct *)voidptr;
+
+	return rfc3676parser(ris->parser, p, l);
+}
+
+/*
+** Push formatted reply downstream.
+*/
+
+static int output_reply(const char *ptr, size_t cnt, void *arg)
+{
+	struct replyinfostruct *s=(struct replyinfostruct *)arg;
+
+	(*s->ri->write_func)(ptr, cnt, s->ri->voidarg);
+	return 0;
+}
+
+/*
+** RFC 3676 parser: Start of a new line in the reply.
+*/
+static int reply_begin(size_t quote_level,
+		       void *arg)
+{
+	struct replyinfostruct *s=(struct replyinfostruct *)arg;
+	unicode_char quoteChar='>';
+
+	/*
+	** Save quote level, begin conversion from unicode to the native
+	** charset.
+	*/
+	s->quote_level=quote_level+s->quote_level_adjust;
+
+	s->u_handle=libmail_u_convert_init(libmail_u_ucs4_native,
+					   s->ri->charset,
+					   output_reply,
+					   s);
+
+	/*
+	** Emit quoting indentation, if any.
+	*/
+	s->start_line=1;
+	s->trailing_spaces=0;
+
+	if (s->u_handle)
+	{
+		size_t i;
+
+		for (i=0; i<s->quote_level; i++)
+		{
+			libmail_u_convert_uc(s->u_handle, &quoteChar, 1);
+		}
+	}
+	return 0;
+}
+
+/*
+** RFC 3676: (possibly partial) contents of a deflowed line, as unicode.
+*/
+
+static int reply_contents(const unicode_char *txt,
+			  size_t txt_size,
+			  void *arg)
+{
+	unicode_char spaceChar=' ';
+	size_t nonspc_cnt;
+
+	struct replyinfostruct *s=(struct replyinfostruct *)arg;
+
+	if (!s->u_handle || txt_size == 0)
+		return 0;
+
+	/*
+	** Space-stuff the initial character.
+	*/
+
+	if (s->start_line)
+	{
+		if (!s->isflowed)
+		{
+			/*
+			** If the original content is not flowed, the rfc3676
+			** parser does not parse the number of > quote
+			** characters and does not set the quote level.
+			*/
+
+			if ((s->quote_level > 0 && *txt != '>') || *txt == ' ')
+				libmail_u_convert_uc(s->u_handle,
+						     &spaceChar, 1);
+
+		}
+		else
+		{
+			if (s->quote_level > 0 || *txt == ' ' || *txt == '>')
+				libmail_u_convert_uc(s->u_handle,
+						     &spaceChar, 1);
+		}
+		s->start_line=0;
+	}
+
+	/*
+	** Trim any trailing spaces from the RFC 3676 parsed content.
+	*/
+
+	for (nonspc_cnt=txt_size; nonspc_cnt > 0; --nonspc_cnt)
+		if (txt[nonspc_cnt-1] != ' ')
+			break;
+
+	/*
+	** If the contents are not totally whitespace, it's ok now to emit
+	** any accumulated whitespace from previous content.
+	*/
+
+	if (nonspc_cnt)
+	{
+		while (s->trailing_spaces)
+		{
+			libmail_u_convert_uc(s->u_handle, &spaceChar, 1);
+			--s->trailing_spaces;
+		}
+
+		libmail_u_convert_uc(s->u_handle, txt, nonspc_cnt);
+	}
+
+	s->trailing_spaces += txt_size - nonspc_cnt;
+	return 0;
+}
+
+static int reply_end(void *arg)
+{
+	unicode_char newLine='\n';
+	struct replyinfostruct *s=(struct replyinfostruct *)arg;
+
+	libmail_u_convert_uc(s->u_handle, &newLine, 1);
+
+	libmail_u_convert_deinit(s->u_handle, NULL);
+	return 0;
+}
+
+/*
+** RFC 3676 parser: flowed line break. Replicate it.
+*/
+static int reply_wrap(void *arg)
+{
+	unicode_char spaceChar=' ';
+	struct replyinfostruct *s=(struct replyinfostruct *)arg;
+
+	/*
+	** It's safe to preserve trailing spaces on flowed lines.
+	*/
+
+	while (s->trailing_spaces)
+	{
+		libmail_u_convert_uc(s->u_handle, &spaceChar, 1);
+		--s->trailing_spaces;
+	}
+
+	libmail_u_convert_uc(s->u_handle, &spaceChar, 1);
+	reply_end(s);
+	reply_begin(s->quote_level-s->quote_level_adjust, s);
+	/* Undo the adjustment in reply_begin() */
+
+	return 0;
+}
+
+static void reformat(struct rfc2045_mkreplyinfo *ri, struct rfc2045 *rfc,
+		     size_t adjustLevel)
+{
+	struct replyinfostruct ris;
+
+	struct rfc3676_parser_info info;
+	int conv_err;
+
+	ris.ri=ri;
+	ris.quote_level_adjust=adjustLevel;
+
+	memset(&info, 0, sizeof(info));
+
+	info.charset=ri->charset;
+	ris.isflowed=info.isflowed=rfc2045_isflowed(rfc);
+	info.isdelsp=rfc2045_isdelsp(rfc);
+
+	info.line_begin=reply_begin;
+	info.line_contents=reply_contents;
+	info.line_flowed_notify=reply_wrap;
+	info.line_end=reply_end;
+	info.arg=&ris;
+
+	if ((ris.parser=rfc3676parser_init(&info)) != NULL)
+	{
+		rfc2045_decodetextmimesection(ri->src, rfc,
+					      ri->charset,
+					      &conv_err,
+					      quotereply,
+					      &ris);
+		rfc3676parser_deinit(ris.parser, NULL);
+	}
+}
+
+static void	replybody(struct rfc2045_mkreplyinfo *ri, struct rfc2045 *rfc)
+{
+	rfc=rfc2045_searchcontenttype(rfc, "text/plain");
+
+	if (!rfc)
+		return;
+
+	reformat(ri, rfc, 1);
+}
+
+static void writes(struct rfc2045_mkreplyinfo *ri, const char *c)
+{
+	(*ri->write_func)(c, strlen(c), ri->voidarg);
+}
+
+static void forwardbody(struct rfc2045_mkreplyinfo *ri, long nbytes)
+{
+	char	buf[BUFSIZ];
+	ssize_t i;
+
+	while ((i=nbytes > sizeof(buf) ? sizeof(buf):nbytes) > 0 &&
+	       (i=SRC_READ(ri->src, buf, i)) > 0)
+	{
+		nbytes -= i;
+		(*ri->write_func)(buf, i, ri->voidarg);
+	}
+}
+
+/*
+** Format a forward
+*/
+static int mkforward(struct rfc2045_mkreplyinfo *ri)
+{
+	off_t	start_pos, end_pos, start_body;
+	off_t	dummy;
+
+	char	*header, *value;
+	char	*subject=0;
+
+	char	*boundary=0;
+
+	struct rfc2045headerinfo *hi;
+
+	struct	rfc2045 *textplain_content;
+	struct	rfc2045 *first_attachment;
+	int attachment_is_message_rfc822;
+
+	/*
+	** Use the original message's subject to set the subject of the
+	** forward message.
+	*/
+
+	hi=rfc2045header_start(ri->src, ri->rfc2045partp);
+
+	if (!hi)
+		return (-1);
+
+	for (;;)
+	{
+		if (rfc2045header_get(hi, &header, &value, 0))
+		{
+			rfc2045header_end(hi);
+			return (-1);
+		}
+
+		if (!header)
+			break;
+		if (strcmp(header, "subject") == 0)
+		{
+			if (subject)	free(subject);
+
+			subject=strdup(value);
+			if (!subject)
+			{
+				rfc2045header_end(hi);
+				return (-1);
+			}
+		}
+	}
+
+	rfc2045header_end(hi);
+
+	writes(ri, "Subject: ");
+
+	if (ri->subject)
+	{
+		/*
+		** ... unless the caller overrides it.
+		*/
+
+		writes(ri, ri->subject);
+	}
+	else if (subject)
+	{
+		char	*s=rfc822_coresubj_keepblobs(subject);
+
+		if (!s)
+			return (-1);
+
+		writes(ri, s);
+		free(s);
+		writes(ri, " (fwd)");
+	}
+	writes(ri, "\nMime-Version: 1.0\n");
+
+	/*
+	** To assemble a forward template, two things are needed:
+	**
+	** 1. The original message, as text/plain.
+	**
+	** 2. Any attachments in the original message.
+	**    A. The attachments get either copied to the forward message, or
+	**    B. The original message is attached as a single message/rfc822
+	**       entity.
+	**
+	** 2b is always produced by "forwardatt". If a suitable text/plain
+	** part of the original message could not be found, 2b is also
+	** produced even by "forward".
+	*/
+
+	textplain_content=NULL;
+
+	attachment_is_message_rfc822=0;
+	first_attachment=NULL;
+
+	{
+		const char *content_type, *dummy;
+
+		struct rfc2045 *top_part=ri->rfc2045partp;
+
+		rfc2045_mimeinfo(top_part,
+				 &content_type, &dummy, &dummy);
+
+		if (strcmp(content_type, "multipart/signed") == 0)
+		{
+			struct rfc2045 *p=top_part->firstpart;
+
+			if (p && p->isdummy)
+				p=p->next;
+
+			if (p)
+			{
+				top_part=p;
+				rfc2045_mimeinfo(top_part,
+						 &content_type, &dummy, &dummy);
+			}
+		}
+		else if (strcmp(content_type, "multipart/x-mimegpg") == 0)
+		{
+			struct rfc2045 *p=top_part->firstpart;
+
+			if (p && p->isdummy)
+				p=p->next;
+
+			if (p)
+			{
+				const char *part_ct;
+
+				rfc2045_mimeinfo(p,
+						 &part_ct, &dummy, &dummy);
+
+				if (strcmp(part_ct, "text/x-gpg-output") == 0
+				    && p->next)
+				{
+					top_part=p->next;
+					rfc2045_mimeinfo(top_part,
+							 &content_type,
+							 &dummy, &dummy);
+				}
+			}
+		}
+
+		if (strcmp(content_type, "text/plain") == 0)
+		{
+			textplain_content=top_part;
+		}
+		else if (strcmp(content_type, "multipart/alternative") == 0)
+		{
+			textplain_content=
+				rfc2045_searchcontenttype(top_part,
+							  "text/plain");
+		}
+		else if (strcmp(content_type, "multipart/mixed") == 0)
+		{
+			struct rfc2045 *p=top_part->firstpart;
+
+			if (p->isdummy)
+				p=p->next;
+
+			textplain_content=
+				rfc2045_searchcontenttype(p, "text/plain");
+
+			/*
+			** If the first part contained a suitable text/plain,
+			** any remaining MIME parts become attachments that
+			** get copied to the forward message.
+			*/
+			if (textplain_content)
+				first_attachment=p->next;
+		}
+
+		if (strcmp(ri->replymode, "forwardatt") == 0 ||
+		    textplain_content == NULL)
+		{
+			/*
+			** Copy the entire message as the sole message/rfc822
+			** attachment in the forward message.
+			*/
+			textplain_content=NULL;
+			first_attachment=top_part;
+			attachment_is_message_rfc822=1;
+		}
+	}
+
+	boundary=strdup(rfc2045_mk_boundary(ri->rfc2045partp, ri->src));
+	if (!boundary)
+	{
+		if (subject)	free(subject);
+		return (-1);
+	}
+
+	if (first_attachment)
+	{
+		writes(ri, "Content-Type: multipart/mixed; boundary=\"");
+		writes(ri, boundary);
+		writes(ri, "\"\n\n");
+		writes(ri, RFC2045MIMEMSG);
+		writes(ri, "\n--");
+		writes(ri, boundary);
+		writes(ri, "\n");
+	}
+
+	if (ri->content_set_charset)
+	{
+		(*ri->content_set_charset)(ri->voidarg);
+	}
+	else
+	{
+		writes(ri, "Content-Type: text/plain; format=flowed; delsp=yes; charset=\"");
+		writes(ri, ri->charset);
+		writes(ri, "\"\n");
+	}
+
+	writes(ri, "Content-Transfer-Encoding: 8bit\n\n");
+	if (ri->content_specify)
+		(*ri->content_specify)(ri->voidarg);
+
+	writes(ri, "\n");
+	if (ri->writesig_func)
+		(*ri->writesig_func)(ri->voidarg);
+	writes(ri, "\n");
+
+	if (ri->forwardsep)
+	{
+		writes(ri, ri->forwardsep);
+		writes(ri, "\n");
+	}
+
+	if (textplain_content)
+	{
+		/* Copy original headers. */
+		
+		hi=rfc2045header_start(ri->src, ri->rfc2045partp);
+		for (;;)
+		{
+			if (rfc2045header_get(hi, &header, &value,
+					      RFC2045H_NOLC|RFC2045H_KEEPNL))
+			{
+				rfc2045header_end(hi);
+				break;
+			}
+			if (!header)
+				break;
+			if (strcasecmp(header, "subject") == 0 ||
+			    strcasecmp(header, "from") == 0 ||
+			    strcasecmp(header, "to") == 0 ||
+			    strcasecmp(header, "cc") == 0 ||
+			    strcasecmp(header, "date") == 0 ||
+			    strcasecmp(header, "message-id") == 0 ||
+			    strcasecmp(header, "resent-from") == 0 ||
+			    strcasecmp(header, "resent-to") == 0 ||
+			    strcasecmp(header, "resent-cc") == 0 ||
+			    strcasecmp(header, "resent-date") == 0 ||
+			    strcasecmp(header, "resent-message-id") == 0)
+			{
+				if (subject) free(subject);
+
+				subject=rfc822_display_hdrvalue_tobuf(header,
+								      value,
+								      ri->charset,
+								      NULL,
+								      NULL);
+
+				if (subject)
+				{
+					(*ri->write_func)(header,
+							  strlen(header),
+							  ri->voidarg);
+					(*ri->write_func)(": ", 2, ri->voidarg);
+					(*ri->write_func)(subject,
+							  strlen(subject),
+							  ri->voidarg);
+					(*ri->write_func)("\n", 1, ri->voidarg);
+				}
+			}
+		}
+		rfc2045header_end(hi);
+		(*ri->write_func)("\n", 1, ri->voidarg);
+
+		reformat(ri, textplain_content, 0);
+	}
+
+	if (first_attachment)
+	{
+		/*
+		** There are attachments to copy
+		*/
+
+		if (attachment_is_message_rfc822)
+		{
+			/* Copy everything as a message/rfc822 */
+
+			writes(ri, "\n--");
+			writes(ri, boundary);
+			writes(ri, "\nContent-Type: message/rfc822\n");
+
+			if (ri->forwarddescr)
+			{
+				char *p=rfc2047_encode_str(ri->forwarddescr,
+							   ri->charset ?
+							   ri->charset
+							   : "iso-8859-1",
+							   rfc2047_qp_allow_any
+							   );
+
+				writes(ri, "Content-Description: ");
+				writes(ri, p ? p:"");
+				free(p);
+				writes(ri, "\n");
+			}
+
+			writes(ri, "\n");
+
+			rfc2045_mimepos(first_attachment, &start_pos, &end_pos,
+					&start_body,
+					&dummy, &dummy);
+			
+			if (SRC_SEEK(ri->src, start_pos) == (off_t)-1)
+			{
+				if (subject) free(subject);
+				free(boundary);
+				return -1;
+			}
+			forwardbody(ri, end_pos - start_pos);
+		}
+		else
+		{
+			/* Copy over individual attachments, one by one */
+
+			for (; first_attachment;
+			     first_attachment=first_attachment->next)
+			{
+				writes(ri, "\n--");
+				writes(ri, boundary);
+				writes(ri, "\n");
+
+				rfc2045_mimepos(first_attachment, &start_pos,
+						&end_pos,
+						&start_body,
+						&dummy, &dummy);
+			
+				if (SRC_SEEK(ri->src, start_pos) == (off_t)-1)
+				{
+					if (subject) free(subject);
+					free(boundary);
+					return -1;
+				}
+
+				forwardbody(ri, end_pos - start_pos);
+			}
+		}
+
+		writes(ri, "\n--");
+		writes(ri, boundary);
+		writes(ri, "--\n");
+	}
+
+	if (subject) free(subject);
+	free(boundary);
+	return (0);
+}
+
+
+static int writereferences(struct rfc2045_mkreplyinfo *ri,
+			    const char *oldref, const char *oldmsgid)
+{
+char	*buf=malloc((oldref ? strlen(oldref):0)
+		+ (oldmsgid ? strlen(oldmsgid):0)+2);
+char	*p, *q;
+struct	rfc822t *tp;
+struct	rfc822a *ap;
+int	i;
+
+	if (!buf)
+		return (-1);
+
+	/* Create new references header */
+	*buf=0;
+	if (oldref)	strcat(buf, oldref);
+	if (oldref && oldmsgid)	strcat(buf, " ");
+	if (oldmsgid)	strcat(buf, oldmsgid);
+
+	/* Do wrapping the RIGHT way, by
+	** RFC822 parsing the References: header
+	*/
+
+	if ((tp=rfc822t_alloc_new(buf, NULL, NULL)) == 0 ||
+		(ap=rfc822a_alloc(tp)) == 0)
+	{
+		free(buf);
+		if (tp)
+			rfc822t_free(tp);
+		return (-1);
+	}
+
+	/* Keep only the last 20 message IDs */
+
+	i=0;
+	if (ap->naddrs > 20)	i=ap->naddrs-20;
+	p="";
+	while (i < ap->naddrs)
+	{
+		q=rfc822_gettok(ap->addrs[i].tokens);
+		if (!q)
+		{
+			rfc822a_free(ap);
+			rfc822t_free(tp);
+			free(buf);
+			return (-1);
+		}
+
+		writes(ri, p);
+		writes(ri, "<");
+		writes(ri, q);
+		writes(ri, ">\n");
+		p="            ";
+		free(q);
+		i++;
+	}
+	rfc822a_free(ap);
+	rfc822t_free(tp);
+	free(buf);
+	return (0);
+}
+
+static char *mlcheck(struct rfc2045_mkreplyinfo *ri, const char *);
+
+static int replydsn(struct rfc2045_mkreplyinfo *);
+static int replyfeedback(struct rfc2045_mkreplyinfo *);
+
+static int mkreply(struct rfc2045_mkreplyinfo *ri)
+{
+	char	*oldtocc, *oldfrom, *oldreplyto, *oldtolist;
+	char	*subject;
+	char	*oldmsgid;
+	char	*oldreferences;
+	char	*oldenvelope;
+	char	*header, *value;
+	char	*date;
+	char	*newsgroup;
+	char	*newsgroups;
+
+	char	*whowrote;
+	off_t	start_pos, end_pos, start_body, dummy;
+	int errflag=0;
+	char	*boundary;
+	char	*dsn_report_type;
+	int	(*dsn_report_gen)(struct rfc2045_mkreplyinfo *);
+
+	struct rfc2045headerinfo *hi;
+
+	oldtocc=0;
+	oldtolist=0;
+	oldfrom=0;
+	oldreplyto=0;
+	subject=0;
+	oldmsgid=0;
+	oldreferences=0;
+	oldenvelope=0;
+	whowrote=0;
+	newsgroup=0;
+	newsgroups=0;
+	date=0;
+
+	rfc2045_mimepos(ri->rfc2045partp, &start_pos, &end_pos, &start_body,
+		&dummy, &dummy);
+
+	hi=rfc2045header_start(ri->src, ri->rfc2045partp);
+
+	if (!hi)
+		return (-1);
+
+#define BLOWUP { \
+		if (whowrote) free(whowrote); \
+		if (subject) free(subject); \
+		if (oldmsgid) free(oldmsgid); \
+		if (oldreferences)	free(oldreferences); \
+		if (oldtocc) free(oldtocc); \
+		if (oldtolist) free(oldtolist); \
+		if (oldfrom) free(oldfrom); \
+		if (oldreplyto)	free(oldreplyto); \
+		if (oldenvelope) free(oldenvelope); \
+		if (newsgroup) free(newsgroup); \
+		if (newsgroups) free(newsgroups); \
+		if (date) free(date); \
+		rfc2045header_end(hi); \
+		return (-1); \
+	}
+
+	for (;;)
+	{
+		if (rfc2045header_get(hi, &header, &value, 0))
+		{
+			BLOWUP;
+			return (-1);
+		}
+
+		if (!header)
+			break;
+
+		if (strcmp(header, "subject") == 0)
+		{
+			if (subject)	free(subject);
+
+			subject=strdup(value);
+			if (!subject)
+				BLOWUP;
+		}
+		else if (strcmp(header, "reply-to") == 0)
+		{
+			if (oldreplyto)	free(oldreplyto);
+			oldreplyto=strdup(value);
+			if (!oldreplyto)
+				BLOWUP;
+		}
+		else if (strcmp(header, "from") == 0)
+		{
+			if (oldfrom)	free(oldfrom);
+			oldfrom=strdup(value);
+			if (!oldfrom)
+				BLOWUP;
+		}
+		else if (strcmp(header, "message-id") == 0)
+		{
+			if (oldmsgid)	free(oldmsgid);
+			oldmsgid=strdup(value);
+			if (!oldmsgid)
+				BLOWUP;
+		}
+		else if (strcmp(header, "references") == 0)
+		{
+			if (oldreferences)	free(oldreferences);
+			oldreferences=strdup(value);
+			if (!oldreferences)
+				BLOWUP;
+		}
+		else if ((strcmp(header, "return-path") == 0 ||
+			  strcmp(header, "errors-to") == 0) &&
+			 ri->replytoenvelope)
+		{
+			if (oldenvelope)	free(oldenvelope);
+			oldenvelope=strdup(value);
+			if (!oldenvelope)
+				BLOWUP;
+		}
+		else if (strcmp(header, "newsgroups") == 0)
+		{
+			if (newsgroups)	free(newsgroups);
+			newsgroups=strdup(value);
+			if (!newsgroups)
+				BLOWUP;
+		}
+		else if (strcmp(header, "x-newsgroup") == 0)
+		{
+			if (newsgroup)	free(newsgroup);
+			newsgroup=strdup(value);
+			if (!newsgroup)
+				BLOWUP;
+		}
+		else if (strcmp(header, "date") == 0)
+		{
+			if (date)	free(date);
+			date=strdup(value);
+			if (!date)
+				BLOWUP;
+		}
+		else if ((strcmp(ri->replymode, "replyall") == 0
+			  || strcmp(ri->replymode, "replylist") == 0) &&
+			 (
+			  strcmp(header, "to") == 0 ||
+			  strcmp(header, "cc") == 0
+			  )
+			 )
+		{
+			char	*newh=malloc( (oldtocc ?
+					       strlen(oldtocc):0)
+					      + strlen(value)+2);
+			char	*p;
+
+				if (!newh)
+					BLOWUP;
+
+				*newh=0;
+				if (oldtocc)
+					strcat(strcpy(newh, oldtocc),
+								",");
+				strcat(newh, value);
+				if (oldtocc)	free(oldtocc);
+				oldtocc=newh;
+
+				p=mlcheck(ri, value);
+				if (!p || (newh=malloc((oldtolist ?
+						       strlen(oldtolist):0)
+					   + strlen(p)+2)) == NULL)
+				{
+					if (p)
+						free(p);
+					BLOWUP;
+				}
+
+				if (*p)
+				{
+					*newh=0;
+					if (oldtolist)
+						strcat(strcpy(newh, oldtolist),
+						       ",");
+					strcat(newh, p);
+					if (oldtolist)
+						free(oldtolist);
+					oldtolist=newh;
+				}
+				free(p);
+		}
+	}
+
+	rfc2045header_end(hi);
+
+	/* Write:  "%s writes:" */
+
+	{
+		struct	rfc822t *rfcp=rfc822t_alloc_new(oldfrom ? oldfrom:"",
+							NULL, NULL);
+		struct	rfc822a *rfcpa;
+		char	*sender_name=NULL;
+		char	*sender_addr=NULL;
+		int	n;
+
+		if (!rfcp)
+			BLOWUP;
+
+		rfcpa=rfc822a_alloc(rfcp);
+		if (!rfcpa)
+		{
+			rfc822t_free(rfcp);
+			BLOWUP;
+		}
+
+		for (n=0; n<rfcpa->naddrs; ++n)
+		{
+			if (rfcpa->addrs[n].tokens == NULL)
+				continue;
+
+			sender_name=rfc822_display_name_tobuf(rfcpa, n,
+							      ri->charset);
+			sender_addr=rfc822_display_addr_tobuf(rfcpa, n,
+							      ri->charset);
+			break;
+		}
+
+		rfc822a_free(rfcpa);
+		rfc822t_free(rfcp);
+
+		whowrote=mksalutation(ri->replysalut,
+				      newsgroup ? newsgroup:"",
+				      oldmsgid ? oldmsgid:"",
+				      newsgroups ? newsgroups:"",
+
+				      sender_addr ? sender_addr:"(no address given)",
+				      sender_name ? sender_name:sender_addr,
+				      date,
+				      subject,
+				      ri->charset);
+
+		if (sender_name)
+			free(sender_name);
+		if (sender_addr)
+			free(sender_addr);
+
+		if (!whowrote)
+		{
+			BLOWUP;
+		}
+	}
+
+	if (newsgroups)
+		free(newsgroups);
+	if (newsgroup)
+		free(newsgroup);
+	if (date)
+		free(date);
+	if (oldreplyto)
+	{
+		if (oldfrom)	free(oldfrom);
+		oldfrom=oldreplyto;
+		oldreplyto=0;
+	}
+
+	if (oldenvelope)
+	{
+		if (oldfrom)	free(oldfrom);
+		oldfrom=oldenvelope;
+		oldenvelope=0;
+	}
+
+	/*
+	** Replytolist: if we found mailing list addresses, drop
+	** oldtocc, we'll use oldtolist.
+	** Otherwise, drop oldtolist.
+	*/
+
+	if (strcmp(ri->replymode, "replylist") == 0)
+	{
+		if (oldtolist)
+		{
+			if (oldtocc)
+			{
+				free(oldtocc);
+				oldtocc=0;
+			}
+
+			if (oldfrom)
+			{
+				free(oldfrom);
+				oldfrom=0;
+			}
+		}
+	}
+	else
+	{
+		if (oldtolist)
+		{
+			free(oldtolist);
+			oldtolist=NULL;
+		}
+	}
+
+	/* Remove duplicate entries from new Cc header */
+
+	if (oldtocc)
+	{
+		struct rfc822t	*rfccc, *rfcto;
+		struct rfc822a	*arfccc, *arfcto;
+		int	i, j;
+		char	*new_addresses;
+
+		rfccc=rfc822t_alloc_new(oldtocc, NULL, NULL);
+		rfcto= oldfrom ? rfc822t_alloc_new(oldfrom, NULL,
+						   NULL):NULL;
+		arfccc=rfccc ? rfc822a_alloc(rfccc):NULL;
+		arfcto=rfcto ? rfc822a_alloc(rfcto):NULL;
+
+		for (i=0; arfccc && i <arfccc->naddrs; i++)
+		{
+			char	*addr=rfc822_getaddr(arfccc, i);
+
+			if (!addr)	continue;
+
+				/* Remove address from Cc if it is my address */
+
+			if ( (ri->myaddr_func)(addr, ri->voidarg))
+			{
+				rfc822_deladdr(arfccc, i); --i;
+				free(addr);
+				continue;
+			}
+
+				/* Remove address from Cc if it appears in To: */
+
+			for (j=0; arfcto && j < arfcto->naddrs; j++)
+			{
+				char *addr2=rfc822_getaddr(arfcto, j);
+
+				if (!addr2)	continue;
+				if (strcmp(addr, addr2) == 0)
+				{
+					free(addr2);
+					break;
+				}
+				free(addr2);
+			}
+			if (arfcto && j < arfcto->naddrs)
+			{
+				rfc822_deladdr(arfccc, i); --i;
+				free(addr);
+				continue;
+			}
+
+				/* Remove outright duplicates in Cc */
+
+			for (j=i+1; j<arfccc->naddrs; j++)
+			{
+				char *addr2=rfc822_getaddr(arfccc, j);
+
+				if (!addr2)	continue;
+				if (strcmp(addr, addr2) == 0)
+				{
+					rfc822_deladdr(arfccc, j);
+					--j;
+				}
+				free(addr2);
+			}
+			free(addr);
+		}
+		new_addresses=rfc822_getaddrs(arfccc);
+		free(oldtocc);
+		oldtocc=new_addresses;
+		if (arfccc)	rfc822a_free(arfccc);
+		if (arfcto)	rfc822a_free(arfcto);
+		rfc822t_free(rfccc);
+		if (rfcto) rfc822t_free(rfcto);
+	}
+
+	if (strcmp(ri->replymode, "feedback") == 0)
+	{
+		if (oldtolist)
+		{
+			free(oldtolist);
+			oldtolist=NULL;
+		}
+
+		if (oldfrom)
+		{
+			free(oldfrom);
+			oldfrom=NULL;
+		}
+
+		if (oldtocc)
+		{
+			free(oldtocc);
+			oldtocc=NULL;
+		}
+	}
+
+	if (oldtolist)
+	{
+		writes(ri, "To: ");
+		writes(ri, oldtolist);
+		writes(ri, "\n");
+		free(oldtolist);
+	}
+
+	if (oldfrom)
+	{
+		writes(ri, "To: ");
+		writes(ri, oldfrom);
+		writes(ri, "\n");
+		free(oldfrom);
+	}
+
+	if (oldtocc)
+	{
+		writes(ri, "Cc: ");
+		writes(ri, oldtocc);
+		writes(ri, "\n");
+		free(oldtocc);
+	}
+
+	if (oldmsgid || oldreferences)
+	{
+		writes(ri, "References: ");
+		if (writereferences(ri, oldreferences, oldmsgid))
+			errflag= -1;
+		if (oldreferences)	free(oldreferences);
+	}
+	if (oldmsgid)
+	{
+		writes(ri, "In-Reply-To: ");
+		writes(ri, oldmsgid);
+		writes(ri, "\n");
+		free(oldmsgid);
+	}
+	writes(ri,"Subject: ");
+
+	if (ri->subject)
+	{
+		writes(ri, ri->subject);
+	}
+	else if (subject)
+	{
+		if (strcmp(ri->replymode, "feedback") == 0 ||
+		    strcmp(ri->replymode, "replyfeedback") == 0)
+		{
+			writes(ri, subject);
+		}
+		else
+		{
+			char	*s=rfc822_coresubj_keepblobs(subject);
+
+			writes(ri, "Re: ");
+			writes(ri, s ? s:"");
+			if (s)	free(s);
+		}
+		free(subject);
+	}
+
+	writes(ri, "\nMime-Version: 1.0\n");
+
+	boundary=NULL;
+	dsn_report_type=NULL;
+
+	if (strcmp(ri->replymode, "replydsn") == 0 && ri->dsnfrom)
+	{
+		dsn_report_type="delivery-status";
+		dsn_report_gen=&replydsn;
+	}
+	else if (strcmp(ri->replymode, "replyfeedback") == 0 ||
+		 strcmp(ri->replymode, "feedback") == 0)
+	{
+		dsn_report_type="feedback-report";
+		dsn_report_gen=&replyfeedback;
+	}
+
+	if (dsn_report_type)
+	{
+		boundary=rfc2045_mk_boundary(ri->rfc2045partp, ri->src);
+		if (!boundary)
+			return (-1);
+
+		writes(ri, "Content-Type: multipart/report;"
+		       " report-type=");
+
+		writes(ri, dsn_report_type);
+		writes(ri, ";\n    boundary=\"");
+
+		writes(ri, boundary);
+
+		writes(ri,"\"\n"
+			"\n"
+			RFC2045MIMEMSG
+			"\n"
+		       "--");
+		writes(ri, boundary);
+		writes(ri, "\n");
+	}
+
+	if (ri->content_set_charset)
+	{
+		(*ri->content_set_charset)(ri->voidarg);
+	}
+	else
+	{
+		writes(ri, "Content-Type: text/plain; format=flowed; delsp=yes; charset=\"");
+		writes(ri, ri->charset);
+		writes(ri, "\"\n");
+	}
+	writes(ri, "Content-Transfer-Encoding: 8bit\n\n");
+
+	if (!ri->donotquote)
+	{
+		if (whowrote)
+		{
+			writes(ri, whowrote);
+			free(whowrote);
+			writes(ri, "\n\n");
+		}
+		if (SRC_SEEK(ri->src, start_body) == (off_t)-1)
+			return (-1);
+
+		replybody(ri, ri->rfc2045partp);
+		writes(ri, "\n");	/* First blank line in the reply */
+	}
+
+	if (ri->content_specify)
+		(*ri->content_specify)(ri->voidarg);
+
+	writes(ri, "\n");
+	if (ri->writesig_func)
+		(*ri->writesig_func)(ri->voidarg);
+	writes(ri, "\n");
+
+	if (boundary)
+	{
+		/* replydsn or replyfeedback */
+
+		char	*header, *value;
+		struct rfc2045headerinfo *hi;
+
+		writes(ri, "\n--");
+		writes(ri, boundary);
+		writes(ri, "\nContent-Type: message/");
+
+		writes(ri, dsn_report_type);
+		writes(ri, "\n"
+		       "Content-Transfer-Encoding: 7bit\n\n");
+
+		if (errflag == 0)
+			errflag=(*dsn_report_gen)(ri);
+
+		writes(ri, "\n--");
+		writes(ri, boundary);
+
+		if (ri->fullmsg)
+		{
+			off_t cnt=end_pos - start_pos;
+			char buf[BUFSIZ];
+
+			writes(ri, "\nContent-Type: message/rfc822\n"
+			       "Content-Disposition: attachment\n\n");
+
+			if (errflag == 0)
+				errflag=SRC_SEEK(ri->src, start_pos);
+
+			while (errflag == 0 && cnt > 0)
+			{
+				int n=cnt > sizeof(BUFSIZ) ? BUFSIZ:(int)cnt;
+
+				n=SRC_READ(ri->src, buf, n);
+
+				if (n <= 0)
+				{
+					errflag= -1;
+					break;
+				}
+				(*ri->write_func)(buf, n, ri->voidarg);
+				cnt -= n;
+			}
+		}
+		else
+		{
+			writes(ri, "\nContent-Type: text/rfc822-headers; charset=\"iso-8859-1\"\n"
+			       "Content-Disposition: attachment\n"
+			       "Content-Transfer-Encoding: 8bit\n\n"
+			       );
+
+			hi=rfc2045header_start(ri->src, ri->rfc2045partp);
+
+			while (hi)
+			{
+				if (rfc2045header_get(hi, &header, &value,
+						      RFC2045H_NOLC) || !header)
+				{
+					rfc2045header_end(hi);
+					break;
+				}
+
+				writes(ri, header);
+				writes(ri, ": ");
+				writes(ri, value);
+				writes(ri, "\n");
+			}
+		}
+		writes(ri, "\n--");
+		writes(ri, boundary);
+		writes(ri, "--\n");
+		free(boundary);
+	}
+	return (errflag);
+}
+
+static void dsn_arrival_date(struct rfc2045_mkreplyinfo *ri)
+{
+	writes(ri, "Arrival-Date: ");
+
+	time_t now;
+
+	time(&now);
+
+	writes(ri, rfc822_mkdate(now));
+	writes(ri, "\n");
+}
+
+static int replydsn(struct rfc2045_mkreplyinfo *ri)
+{
+	dsn_arrival_date(ri);
+
+	writes (ri, "\n"
+		"Final-Recipient: rfc822; ");
+
+	writes(ri, ri->dsnfrom);
+
+	writes(ri, "\n"
+	       "Action: delivered\n"
+	       "Status: 2.0.0\n");
+	return 0;
+}
+
+static int replyfeedback(struct rfc2045_mkreplyinfo *ri)
+{
+	size_t i;
+
+	dsn_arrival_date(ri);
+	writes(ri, "User-Agent: librfc2045 "
+	       RFC2045PKG "/" RFC2045VER
+	       "\n"
+	       "Version: 1\n");
+
+	for (i=0; ri->feedbackheaders &&
+		     ri->feedbackheaders[i] && ri->feedbackheaders[i+1];
+	     i += 2)
+	{
+		char *p=strdup(ri->feedbackheaders[i]), *q;
+		char lastch;
+
+		if (!p)
+			return -1;
+
+		lastch='-';
+		for (q=p; *q; q++)
+		{
+			if (*q >= 'A' && *q <= 'Z')
+				*q += 'a'-'A';
+
+			if (lastch == '-' && *q >= 'a' && *q <= 'z')
+				*q += 'A' - 'a';
+			lastch=*q;
+		}
+
+		writes(ri, p);
+		free(p);
+		writes(ri, ": ");
+		writes(ri, ri->feedbackheaders[i+1]);
+		writes(ri, "\n");
+	}
+
+	return 0;
+}
+
+
+/*
+** Accept a list of recipients, and return a list that contains only those
+** recipients that are defined as mailing lists.
+*/
+
+static char *do_checkmailinglists(struct rfc822a *a,
+				  struct rfc2045_mkreplyinfo *,
+				  char *);
+
+static char *mlcheck(struct rfc2045_mkreplyinfo *ri, const char *hdr)
+{
+	struct rfc822t *t;
+	struct rfc822a *a;
+
+	char *mlcopy;
+	char *p;
+
+	t=rfc822t_alloc_new(hdr, NULL, NULL);
+
+	if (!t)
+		return (0);
+
+	a=rfc822a_alloc(t);
+
+	if (!a)
+	{
+		rfc822t_free(t);
+		return (0);
+	}
+
+	mlcopy=strdup(ri->mailinglists ? ri->mailinglists:"");
+	if (!mlcopy)
+		p=0;
+	else
+	{
+		p=do_checkmailinglists(a, ri, mlcopy);
+		free(mlcopy);
+	}
+
+	rfc822a_free(a);
+	rfc822t_free(t);
+	return (p);
+}
+
+static char *do_checkmailinglists(struct rfc822a *a,
+				  struct rfc2045_mkreplyinfo *ri,
+				  char *mlbuffer)
+{
+	int i;
+
+	for (i=0; i<a->naddrs; i++)
+	{
+		char *p=rfc822_getaddr(a, i);
+		char *q;
+
+		if (!p)
+			return (NULL);
+
+		strcpy(mlbuffer, ri->mailinglists ? ri->mailinglists:"");
+
+		for (q=mlbuffer; (q=strtok(q, "\n \t")) != NULL; q=NULL)
+		{
+			if (strcasecmp(p, q) == 0)
+				break;
+		}
+
+		free(p);
+		if (q == NULL)
+		{
+			rfc822_deladdr(a, i);
+			--i;
+		}
+	}
+
+	if (a->naddrs == 0)
+		return (strdup(""));
+	return (rfc822_getaddrs(a));
+}
-- 
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