permstr.c
2.52 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2008, 2010-2012, 2014-2017 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 of the License, 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 this library. If not, see
<http://www.gnu.org/licenses/>. */
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <mailutils/stream.h>
#include <mailutils/util.h>
#include <mailutils/errno.h>
#define FILE_PERM_READ 0x1
#define FILE_PERM_WRITE 0x2
static int
parse_perm_bits (int *pmode, const char *str, const char **endp)
{
switch (*str)
{
case '+':
case '=':
str++;
break;
default:
if (endp)
*endp = str;
return 1;
}
for (; *str; str++)
{
switch (*str)
{
case 'r':
*pmode |= FILE_PERM_READ;
break;
case 'w':
*pmode |= FILE_PERM_WRITE;
break;
case ',':
if (endp)
*endp = str;
return 0;
default:
if (endp)
*endp = str;
return 1;
}
}
if (endp)
*endp = str;
return 0;
}
/* Parse a MU stream permission specification in form:
g(+|=)[wr]+,o(+|=)[wr]+
Return 0 on success.
On failure, return MU_ERR_FAILURE and point endp to the offending character.
*/
int
mu_parse_stream_perm_string (int *pmode, const char *str, const char **endp)
{
int mode = 0;
int f;
while (*str)
{
switch (*str)
{
case 'g':
if (parse_perm_bits (&f, str + 1, &str))
{
if (endp)
*endp = str;
return MU_ERR_FAILURE;
}
if (f & FILE_PERM_READ)
mode |= MU_STREAM_IRGRP;
if (f & FILE_PERM_WRITE)
mode |= MU_STREAM_IWGRP;
break;
case 'o':
if (parse_perm_bits (&f, str + 1, &str))
{
if (endp)
*endp = str;
return MU_ERR_FAILURE;
}
if (f & FILE_PERM_READ)
mode |= MU_STREAM_IROTH;
if (f & FILE_PERM_WRITE)
mode |= MU_STREAM_IWOTH;
break;
default:
if (endp)
*endp = str;
return MU_ERR_FAILURE;
}
if (*str == ',')
str++;
}
*pmode = mode;
if (endp)
*endp = str;
return 0;
}