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/* This file is part of Mailfromd.             -*- c -*-
   Copyright (C) 2008 Sergey Poznyakoff

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>. */

#include "msg.h"

static void *
alloc_msgs()
{
	return xcalloc(NMSGS, sizeof(struct mf_message));
}

static void
destroy_msgs(void *data)
{
	struct mf_message *mtab = data;
	struct mf_message *p;
	for (p = mtab; p < mtab + NMSGS; p++) {
		bi_close_message(p);
	}
	free(mtab);
}

void
drop_current_message(void *data)
{
	int i;
	struct mf_message *tab = data;
	for (i = 0; i < NMSGS; i++)
		if (tab[i].msg && tab[i].current) {
			bi_close_message(&tab[i]);
			break;
		}
}

MF_DECLARE_DATA(MSGTAB, alloc_msgs, destroy_msgs, drop_current_message)

static int
find_slot(struct mf_message *tab)
{
	int i;
	for (i = 0; i < NMSGS; i++)
		if (tab[i].msg == NULL)
			return i;
	return -1;
}

static int
do_msg_close(void *item, void *data)
{
	bi_close_message(item);
	return 0;
}

void
bi_close_message(struct mf_message *mp)
{
	if (mp->msg) {
		if (mp->mylist) {
			mu_list_remove(mp->mylist, mp);
			mu_list_destroy(&mp->mylist);
		}
		mu_list_do(mp->msglist, do_msg_close, NULL);
		mu_list_destroy(&mp->msglist);
		free(mp->buf);
		memset(mp, 0, sizeof *mp);
	}
}

int
bi_message_register(eval_environ_t env,
		    mu_list_t msglist, mu_message_t msg, int current)
{
	struct mf_message *msgtab = MF_GET_DATA;
	int idx = find_slot(msgtab);
	if (idx >= 0) {
		struct mf_message *mp = msgtab + idx;
		mp->msg = msg;
		mp->current = current;
		mu_list_create(&mp->mylist);
		mu_list_create(&mp->msglist);
		if (msglist)
			mu_list_append(msglist, mp);
	}
	return idx;
}

int
bi_get_current_message(eval_environ_t env)
{
	int i;
	struct mf_message *tab = MF_GET_DATA;
	for (i = 0; i < NMSGS; i++)
		if (tab[i].msg && tab[i].current)
			return i;
	return -1;
}


m4_define([<DCL_MSG>],[<
	struct mf_message *mtab = MF_GET_DATA;
	struct mf_message *$1;
			
	MF_ASSERT($2 >= 0 && $2 < NMSGS,
		  mfe_range,
		  _("Invalid message descriptor"));
	$1 = mtab + $2;
	MF_ASSERT($1->msg,
		  mfe_failure,
		  _("Message not open"))
>])

m4_define([<DCL_BODY>],[<
	DCL_MSG($1, $2);
	if (!$1->body) {
		int rc = mu_message_get_body($1->msg, &$1->body);
		MF_ASSERT(rc == 0,
			  mfe_failure,
			  "mu_message_get_body: %s",
			  mu_strerror(rc));
	}	  
>])

m4_define([<DCL_HDR>],[<
	DCL_MSG($1, $2);
	if (!$1->hdr) {
		int rc = mu_message_get_header($1->msg, &$1->hdr);
		MF_ASSERT(rc == 0,
			  mfe_failure,
			  "mu_message_get_header: %s",
			  mu_strerror(rc));
	}	  
>])

mu_message_t
bi_message_from_descr(eval_environ_t env, int nmsg)
{
	DCL_MSG(mp, nmsg);
	return mp->msg;
}

/* void message_close(number msg) */
MF_DEFUN(message_close, VOID, NUMBER nmsg)
{
	DCL_MSG(mp, nmsg);
	bi_close_message(mp);
}
END

/* number message_size(number nmsg) */
MF_DEFUN(message_size, NUMBER, NUMBER nmsg)
{
	int rc;
	size_t size;
	DCL_MSG(mp, nmsg);
	
	rc = mu_message_size(mp->msg, &size);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "%s", mu_strerror(rc));
	MF_ASSERT(size < LONG_MAX,
		  mfe_range,
		  _("Message size out of representable range"));
	MF_RETURN((long)size);
}	
END

/* number message_lines(number nmsg) */
MF_DEFUN(message_lines, NUMBER, NUMBER nmsg)
{
	int rc;
	size_t lines;
	DCL_MSG(mp, nmsg);

	rc = mu_message_lines(mp->msg, &lines);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "%s",
		  mu_strerror(rc));
	MF_RETURN(lines);
}
END

/* number message_body_size(number nmsg) */
MF_DEFUN(message_body_size, NUMBER, NUMBER nmsg)
{
	int rc;
	size_t size;
	DCL_BODY(mp, nmsg);
	
	rc = mu_body_size(mp->body, &size);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "%s", mu_strerror(rc));
	MF_ASSERT(size < LONG_MAX,
		  mfe_range,
		  _("Body size out of representable range"));
	MF_RETURN((long)size);
}
END

/* number message_body_lines(number nmsg) */
MF_DEFUN(message_body_lines, NUMBER, NUMBER nmsg)
{
	int rc;
	size_t lines;
	DCL_BODY(mp, nmsg);

	rc = mu_body_lines(mp->body, &lines);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "%s",
		  mu_strerror(rc));
	MF_RETURN(lines);
}
END


/* Headers */

/* number message_header_size(number nmsg) */
MF_DEFUN(message_header_size, NUMBER, NUMBER nmsg)
{
	int rc;
	size_t size;
	DCL_HDR(mp, nmsg);
	
	rc = mu_header_size(mp->hdr, &size);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "%s", mu_strerror(rc));
	MF_ASSERT(size < LONG_MAX,
		  mfe_range,
		  _("Header size out of representable range"));
	MF_RETURN((long)size);
}
END

/* number message_header_lines(number nmsg) */
MF_DEFUN(message_header_lines, NUMBER, NUMBER nmsg)
{
	int rc;
	size_t lines;
	DCL_HDR(mp, nmsg);

	rc = mu_header_lines(mp->hdr, &lines);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "%s",
		  mu_strerror(rc));
	MF_RETURN(lines);
}
END

/* number message_header_count(number nmsg) */
MF_DEFUN(message_header_count, NUMBER, NUMBER nmsg)
{
	int rc;
	size_t count;
	DCL_HDR(mp, nmsg);

	rc = mu_header_get_field_count(mp->hdr, &count);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "%s",
		  mu_strerror(rc));
	MF_RETURN(count);
}
END

/* bool message_has_header(number msg, string header[, number idx]) */
MF_DEFUN(message_has_header, NUMBER, NUMBER nmsg, STRING header,
	 OPTIONAL, NUMBER idx)
{
	int rc;
	const char *val;
	DCL_HDR(mp, nmsg);

	rc = mu_header_sget_value_n(mp->hdr, header, MF_OPTVAL(idx, 1), &val);
 	MF_RETURN(rc == 0);
}
END

/* string message_find_header(number msg, string header[, number idx]) */
MF_DEFUN(message_find_header, STRING, NUMBER nmsg, STRING header,
	 OPTIONAL, NUMBER idx)
{
	int rc;
	const char *val;
	DCL_HDR(mp, nmsg);

	rc = mu_header_sget_value_n(mp->hdr, header, MF_OPTVAL(idx, 1), &val);
	if (rc == MU_ERR_NOENT)
		MF_THROW(mfe_not_found, _("Header not found"));
	else if (rc)
		MF_THROW(mfe_failure, "%s", mu_strerror(rc));
	MF_RETURN_STRING(val);
}
END


/* Multipart messages */

/* bool message_is_multipart(number msg) */
MF_DEFUN(message_is_multipart, NUMBER, NUMBER nmsg)
{
	int rc, res;
	DCL_MSG(mp, nmsg);

	rc = mu_message_is_multipart(mp->msg, &res);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "%s",
		  mu_strerror(rc));
	MF_RETURN(res);
}
END

/* number message_count_parts(number msg) */
MF_DEFUN(message_count_parts, NUMBER, NUMBER nmsg)
{
	int rc;
	size_t count;
	DCL_MSG(mp, nmsg);
	rc = mu_message_get_num_parts(mp->msg, &count);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "%s",
		  mu_strerror(rc));
	MF_RETURN(count);
}
END

/* number message_get_part(number msg, number idx) */
MF_DEFUN(message_get_part, NUMBER, NUMBER nmsg, NUMBER idx)
{
	int rc;
	mu_message_t msg;
	DCL_MSG(mp, nmsg);

	rc = mu_message_get_part(mp->msg, idx, &msg);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "%s",
		  mu_strerror(rc));
	rc = bi_message_register(env, mp->msglist, msg, 0);
	MF_ASSERT(rc >= 0,
		  mfe_failure,
		  _("No more message slots available"));
	MF_RETURN(rc);
}
END


/* Reading */

/* string message_rewind(number nmsg) */
MF_DEFUN(message_rewind, VOID, NUMBER nmsg)
{
	int rc;
	mu_stream_t str;
	DCL_MSG(mp, nmsg);
	rc = mu_message_get_stream(mp->msg, &str);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "mu_message_get_stream: %s",
		  mu_strerror(rc));
	rc = mu_stream_seek(str, 0, SEEK_SET);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "mu_stream_seek: %s",
		  mu_strerror(rc));
}
END

/* string message_read_line(number nmsg) */
MF_DEFUN(message_read_line, STRING, NUMBER nmsg)
{
	int rc;
	mu_stream_t str;
	size_t size;
	DCL_MSG(mp, nmsg);

	rc = mu_message_get_stream(mp->msg, &str);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "mu_message_get_stream: %s",
		  mu_strerror(rc));
	rc = mu_stream_sequential_getline(str, &mp->buf, &mp->bufsize, &size);
	MF_ASSERT(rc == 0,
		  mfe_io,
		  "mu_stream_sequential_getline: %s",
		  mu_strerror(rc));
	MF_ASSERT(size > 0,
		  mfe_not_found, /* FIXME: Should be mfe_eof */
		  "mu_stream_sequential_getline: %s",
		  _("end of input"));
	MF_RETURN_STRING(mp->buf);
}
END

/* string message_body_rewind(number nmsg) */
MF_DEFUN(message_body_rewind, VOID, NUMBER nmsg)
{
	int rc;
	mu_stream_t str;
	DCL_BODY(mp, nmsg);
	rc = mu_body_get_stream(mp->body, &str);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "mu_message_get_stream: %s",
		  mu_strerror(rc));
	rc = mu_stream_seek(str, 0, SEEK_SET);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "mu_stream_seek: %s",
		  mu_strerror(rc));
}
END

/* string message_read_body_line(number msg)  */
MF_DEFUN(message_read_body_line, STRING, NUMBER nmsg)
{
	int rc;
	mu_stream_t str;
	size_t size;
	DCL_BODY(mp, nmsg);
	
	rc = mu_body_get_stream(mp->body, &str);
	MF_ASSERT(rc == 0,
		  mfe_failure,
		  "mu_body_get_stream: %s",
		  mu_strerror(rc));
	rc = mu_stream_sequential_getline(str, &mp->buf, &mp->bufsize, &size);
	MF_ASSERT(rc == 0,
		  mfe_io,
		  "mu_stream_sequential_getline: %s",
		  mu_strerror(rc));
	MF_ASSERT(size > 0,
		  mfe_not_found, /* FIXME: Should be mfe_eof */
		  "mu_stream_sequential_getline: %s",
		  _("end of input"));
	MF_RETURN_STRING(mp->buf);
}
END

MF_INIT

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