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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2019-2025 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This library 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include <sys/stat.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <mailutils/sys/dotmail.h>
#include <mailutils/sys/folder.h>
#include <mailutils/sys/registrar.h>
#include <mailutils/url.h>
#include <mailutils/util.h>
#include <mailutils/cctype.h>
/* Return MU_FOLDER_ATTRIBUTE_FILE if NAME looks like a dotmail
mailbox.
If MU_AUTODETECT_ACCURACY is 0 (i.e. autodetection is disabled),
always returns MU_FOLDER_ATTRIBUTE_FILE.
Otherwise, the function analyzes first 128 bytes from file. If they
look like a message header start, i.e. match "^[A-Za-z_][A-Za-z0-9_-]*:",
then the file is considered a dotmail mailbox.
Additionally, if MU_AUTODETECT_ACCURACY is greater than 1, the last
3 characters of the file are considered. For valid dotmail they must
be "\n.\n".
*/
static int
dotmail_detect (char const *name)
{
FILE *fp;
int rc = 0;
if (mu_autodetect_accuracy () == 0)
return MU_FOLDER_ATTRIBUTE_FILE;
fp = fopen (name, "r");
if (fp)
{
size_t i;
int c;
/* Allowed character classes for first and subsequent characters
in the first line: */
int allowed[] = { MU_CTYPE_IDENT, MU_CTYPE_HEADR };
for (i = 0;
i < 128
&& (c = getc (fp)) != EOF
&& mu_c_is_class (c, allowed[i>0]);
i++)
;
if (c == ':')
{
/* Possibly a header line */
char buf[3];
if (mu_autodetect_accuracy () == 1
|| (fseek (fp, -3, SEEK_END) == 0
&& fread (buf, 3, 1, fp) == 1
&& memcmp (buf, "\n.\n", 3) == 0))
rc = MU_FOLDER_ATTRIBUTE_FILE;
}
fclose (fp);
}
return rc;
}
static int
dotmail_is_scheme (mu_record_t record, mu_url_t url, int flags)
{
int rc = 0;
int scheme_matched = mu_url_is_scheme (url, record->scheme);
if (scheme_matched || mu_scheme_autodetect_p (url))
{
struct stat st;
const char *path;
mu_url_sget_path (url, &path);
if (stat (path, &st) < 0)
{
if (errno == ENOENT)
{
if (scheme_matched)
return MU_FOLDER_ATTRIBUTE_FILE & flags;
}
return 0;
}
if (S_ISREG (st.st_mode) || S_ISCHR (st.st_mode))
{
if (st.st_size == 0)
{
rc |= MU_FOLDER_ATTRIBUTE_FILE;
}
else if (flags & MU_FOLDER_ATTRIBUTE_FILE)
{
rc |= dotmail_detect (path);
}
}
if ((flags & MU_FOLDER_ATTRIBUTE_DIRECTORY)
&& S_ISDIR (st.st_mode))
rc |= MU_FOLDER_ATTRIBUTE_DIRECTORY;
}
return rc;
}
static struct _mu_record _dotmail_record =
{
MU_MBOX_PRIO,
"dotmail",
MU_RECORD_LOCAL,
MU_URL_SCHEME | MU_URL_PATH | MU_URL_PARAM,
MU_URL_PATH,
mu_url_expand_path, /* URL init. */
mu_dotmail_mailbox_init, /* Mailbox init. */
NULL, /* Mailer init. */
_mu_fsfolder_init, /* Folder init. */
NULL, /* No need for back pointer. */
dotmail_is_scheme, /* _is_scheme method. */
NULL, /* _get_url method. */
NULL, /* _get_mailbox method. */
NULL, /* _get_mailer method. */
NULL /* _get_folder method. */
};
mu_record_t mu_dotmail_record = &_dotmail_record;
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