533 lines
12 KiB
C
533 lines
12 KiB
C
/* Implementation of the CHMOD intrinsic.
|
|
Copyright (C) 2006-2016 Free Software Foundation, Inc.
|
|
Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>
|
|
|
|
This file is part of the GNU Fortran runtime library (libgfortran).
|
|
|
|
Libgfortran 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 of the License, or (at your option) any later version.
|
|
|
|
Libgfortran 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.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include "libgfortran.h"
|
|
|
|
#if defined(HAVE_SYS_STAT_H)
|
|
|
|
#include <string.h> /* For memcpy. */
|
|
#include <stdlib.h> /* For free. */
|
|
#include <sys/stat.h> /* For stat, chmod and umask. */
|
|
|
|
|
|
/* INTEGER FUNCTION CHMOD (NAME, MODE)
|
|
CHARACTER(len=*), INTENT(IN) :: NAME, MODE
|
|
|
|
Sets the file permission "chmod" using a mode string.
|
|
|
|
For MinGW, only _S_IWRITE and _S_IREAD are supported. To set those,
|
|
only the user attributes are used.
|
|
|
|
The mode string allows for the same arguments as POSIX's chmod utility.
|
|
a) string containing an octal number.
|
|
b) Comma separated list of clauses of the form:
|
|
[<who-list>]<op>[<perm-list>|<permcopy>][<op>[<perm-list>|<permcopy>],...]
|
|
<who> - 'u', 'g', 'o', 'a'
|
|
<op> - '+', '-', '='
|
|
<perm> - 'r', 'w', 'x', 'X', 's', t'
|
|
If <op> is not followed by a perm-list or permcopy, '-' and '+' do not
|
|
change the mode while '=' clears all file mode bits. 'u' stands for the
|
|
user permissions, 'g' for the group and 'o' for the permissions for others.
|
|
'a' is equivalent to 'ugo'. '+' sets the given permission in addition to
|
|
the ones of the file, '-' unsets the given permissions of the file, while
|
|
'=' sets the file to that mode. 'r' sets the read, 'w' the write, and
|
|
'x' the execute mode. 'X' sets the execute bit if the file is a directory
|
|
or if the user, group or other executable bit is set. 't' sets the sticky
|
|
bit, 's' (un)sets the and/or S_ISUID/S_ISGID bit.
|
|
|
|
Note that if <who> is omitted, the permissions are filtered by the umask.
|
|
|
|
A return value of 0 indicates success, -1 an error of chmod() while 1
|
|
indicates a mode parsing error. */
|
|
|
|
|
|
static int
|
|
chmod_internal (char *file, char *mode, gfc_charlen_type mode_len)
|
|
{
|
|
int i;
|
|
bool ugo[3];
|
|
bool rwxXstugo[9];
|
|
int set_mode, part;
|
|
bool honor_umask, continue_clause = false;
|
|
#ifndef __MINGW32__
|
|
bool is_dir;
|
|
#endif
|
|
mode_t mode_mask, file_mode, new_mode;
|
|
struct stat stat_buf;
|
|
|
|
if (mode_len == 0)
|
|
return 1;
|
|
|
|
if (mode[0] >= '0' && mode[0] <= '9')
|
|
{
|
|
#ifdef __MINGW32__
|
|
unsigned fmode;
|
|
if (sscanf (mode, "%o", &fmode) != 1)
|
|
return 1;
|
|
file_mode = (mode_t) fmode;
|
|
#else
|
|
if (sscanf (mode, "%o", &file_mode) != 1)
|
|
return 1;
|
|
#endif
|
|
return chmod (file, file_mode);
|
|
}
|
|
|
|
/* Read the current file mode. */
|
|
if (stat (file, &stat_buf))
|
|
return 1;
|
|
|
|
file_mode = stat_buf.st_mode & ~S_IFMT;
|
|
#ifndef __MINGW32__
|
|
is_dir = stat_buf.st_mode & S_IFDIR;
|
|
#endif
|
|
|
|
#ifdef HAVE_UMASK
|
|
/* Obtain the umask without distroying the setting. */
|
|
mode_mask = 0;
|
|
mode_mask = umask (mode_mask);
|
|
(void) umask (mode_mask);
|
|
#else
|
|
honor_umask = false;
|
|
#endif
|
|
|
|
for (i = 0; i < mode_len; i++)
|
|
{
|
|
if (!continue_clause)
|
|
{
|
|
ugo[0] = false;
|
|
ugo[1] = false;
|
|
ugo[2] = false;
|
|
#ifdef HAVE_UMASK
|
|
honor_umask = true;
|
|
#endif
|
|
}
|
|
continue_clause = false;
|
|
rwxXstugo[0] = false;
|
|
rwxXstugo[1] = false;
|
|
rwxXstugo[2] = false;
|
|
rwxXstugo[3] = false;
|
|
rwxXstugo[4] = false;
|
|
rwxXstugo[5] = false;
|
|
rwxXstugo[6] = false;
|
|
rwxXstugo[7] = false;
|
|
rwxXstugo[8] = false;
|
|
part = 0;
|
|
set_mode = -1;
|
|
for (; i < mode_len; i++)
|
|
{
|
|
switch (mode[i])
|
|
{
|
|
/* User setting: a[ll]/u[ser]/g[roup]/o[ther]. */
|
|
case 'a':
|
|
if (part > 1)
|
|
return 1;
|
|
ugo[0] = true;
|
|
ugo[1] = true;
|
|
ugo[2] = true;
|
|
part = 1;
|
|
#ifdef HAVE_UMASK
|
|
honor_umask = false;
|
|
#endif
|
|
break;
|
|
case 'u':
|
|
if (part == 2)
|
|
{
|
|
rwxXstugo[6] = true;
|
|
part = 4;
|
|
break;
|
|
}
|
|
if (part > 1)
|
|
return 1;
|
|
ugo[0] = true;
|
|
part = 1;
|
|
#ifdef HAVE_UMASK
|
|
honor_umask = false;
|
|
#endif
|
|
break;
|
|
case 'g':
|
|
if (part == 2)
|
|
{
|
|
rwxXstugo[7] = true;
|
|
part = 4;
|
|
break;
|
|
}
|
|
if (part > 1)
|
|
return 1;
|
|
ugo[1] = true;
|
|
part = 1;
|
|
#ifdef HAVE_UMASK
|
|
honor_umask = false;
|
|
#endif
|
|
break;
|
|
case 'o':
|
|
if (part == 2)
|
|
{
|
|
rwxXstugo[8] = true;
|
|
part = 4;
|
|
break;
|
|
}
|
|
if (part > 1)
|
|
return 1;
|
|
ugo[2] = true;
|
|
part = 1;
|
|
#ifdef HAVE_UMASK
|
|
honor_umask = false;
|
|
#endif
|
|
break;
|
|
|
|
/* Mode setting: =+-. */
|
|
case '=':
|
|
if (part > 2)
|
|
{
|
|
continue_clause = true;
|
|
i--;
|
|
part = 2;
|
|
goto clause_done;
|
|
}
|
|
set_mode = 1;
|
|
part = 2;
|
|
break;
|
|
|
|
case '-':
|
|
if (part > 2)
|
|
{
|
|
continue_clause = true;
|
|
i--;
|
|
part = 2;
|
|
goto clause_done;
|
|
}
|
|
set_mode = 2;
|
|
part = 2;
|
|
break;
|
|
|
|
case '+':
|
|
if (part > 2)
|
|
{
|
|
continue_clause = true;
|
|
i--;
|
|
part = 2;
|
|
goto clause_done;
|
|
}
|
|
set_mode = 3;
|
|
part = 2;
|
|
break;
|
|
|
|
/* Permissions: rwxXst - for ugo see above. */
|
|
case 'r':
|
|
if (part != 2 && part != 3)
|
|
return 1;
|
|
rwxXstugo[0] = true;
|
|
part = 3;
|
|
break;
|
|
|
|
case 'w':
|
|
if (part != 2 && part != 3)
|
|
return 1;
|
|
rwxXstugo[1] = true;
|
|
part = 3;
|
|
break;
|
|
|
|
case 'x':
|
|
if (part != 2 && part != 3)
|
|
return 1;
|
|
rwxXstugo[2] = true;
|
|
part = 3;
|
|
break;
|
|
|
|
case 'X':
|
|
if (part != 2 && part != 3)
|
|
return 1;
|
|
rwxXstugo[3] = true;
|
|
part = 3;
|
|
break;
|
|
|
|
case 's':
|
|
if (part != 2 && part != 3)
|
|
return 1;
|
|
rwxXstugo[4] = true;
|
|
part = 3;
|
|
break;
|
|
|
|
case 't':
|
|
if (part != 2 && part != 3)
|
|
return 1;
|
|
rwxXstugo[5] = true;
|
|
part = 3;
|
|
break;
|
|
|
|
/* Tailing blanks are valid in Fortran. */
|
|
case ' ':
|
|
for (i++; i < mode_len; i++)
|
|
if (mode[i] != ' ')
|
|
break;
|
|
if (i != mode_len)
|
|
return 1;
|
|
goto clause_done;
|
|
|
|
case ',':
|
|
goto clause_done;
|
|
|
|
default:
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
clause_done:
|
|
if (part < 2)
|
|
return 1;
|
|
|
|
new_mode = 0;
|
|
|
|
#ifdef __MINGW32__
|
|
|
|
/* Read. */
|
|
if (rwxXstugo[0] && (ugo[0] || honor_umask))
|
|
new_mode |= _S_IREAD;
|
|
|
|
/* Write. */
|
|
if (rwxXstugo[1] && (ugo[0] || honor_umask))
|
|
new_mode |= _S_IWRITE;
|
|
|
|
#else
|
|
|
|
/* Read. */
|
|
if (rwxXstugo[0])
|
|
{
|
|
if (ugo[0] || honor_umask)
|
|
new_mode |= S_IRUSR;
|
|
if (ugo[1] || honor_umask)
|
|
new_mode |= S_IRGRP;
|
|
if (ugo[2] || honor_umask)
|
|
new_mode |= S_IROTH;
|
|
}
|
|
|
|
/* Write. */
|
|
if (rwxXstugo[1])
|
|
{
|
|
if (ugo[0] || honor_umask)
|
|
new_mode |= S_IWUSR;
|
|
if (ugo[1] || honor_umask)
|
|
new_mode |= S_IWGRP;
|
|
if (ugo[2] || honor_umask)
|
|
new_mode |= S_IWOTH;
|
|
}
|
|
|
|
/* Execute. */
|
|
if (rwxXstugo[2])
|
|
{
|
|
if (ugo[0] || honor_umask)
|
|
new_mode |= S_IXUSR;
|
|
if (ugo[1] || honor_umask)
|
|
new_mode |= S_IXGRP;
|
|
if (ugo[2] || honor_umask)
|
|
new_mode |= S_IXOTH;
|
|
}
|
|
|
|
/* 'X' execute. */
|
|
if (rwxXstugo[3]
|
|
&& (is_dir || (file_mode & (S_IXUSR | S_IXGRP | S_IXOTH))))
|
|
new_mode |= (S_IXUSR | S_IXGRP | S_IXOTH);
|
|
|
|
/* 's'. */
|
|
if (rwxXstugo[4])
|
|
{
|
|
if (ugo[0] || honor_umask)
|
|
new_mode |= S_ISUID;
|
|
if (ugo[1] || honor_umask)
|
|
new_mode |= S_ISGID;
|
|
}
|
|
|
|
/* As original 'u'. */
|
|
if (rwxXstugo[6])
|
|
{
|
|
if (ugo[1] || honor_umask)
|
|
{
|
|
if (file_mode & S_IRUSR)
|
|
new_mode |= S_IRGRP;
|
|
if (file_mode & S_IWUSR)
|
|
new_mode |= S_IWGRP;
|
|
if (file_mode & S_IXUSR)
|
|
new_mode |= S_IXGRP;
|
|
}
|
|
if (ugo[2] || honor_umask)
|
|
{
|
|
if (file_mode & S_IRUSR)
|
|
new_mode |= S_IROTH;
|
|
if (file_mode & S_IWUSR)
|
|
new_mode |= S_IWOTH;
|
|
if (file_mode & S_IXUSR)
|
|
new_mode |= S_IXOTH;
|
|
}
|
|
}
|
|
|
|
/* As original 'g'. */
|
|
if (rwxXstugo[7])
|
|
{
|
|
if (ugo[0] || honor_umask)
|
|
{
|
|
if (file_mode & S_IRGRP)
|
|
new_mode |= S_IRUSR;
|
|
if (file_mode & S_IWGRP)
|
|
new_mode |= S_IWUSR;
|
|
if (file_mode & S_IXGRP)
|
|
new_mode |= S_IXUSR;
|
|
}
|
|
if (ugo[2] || honor_umask)
|
|
{
|
|
if (file_mode & S_IRGRP)
|
|
new_mode |= S_IROTH;
|
|
if (file_mode & S_IWGRP)
|
|
new_mode |= S_IWOTH;
|
|
if (file_mode & S_IXGRP)
|
|
new_mode |= S_IXOTH;
|
|
}
|
|
}
|
|
|
|
/* As original 'o'. */
|
|
if (rwxXstugo[8])
|
|
{
|
|
if (ugo[0] || honor_umask)
|
|
{
|
|
if (file_mode & S_IROTH)
|
|
new_mode |= S_IRUSR;
|
|
if (file_mode & S_IWOTH)
|
|
new_mode |= S_IWUSR;
|
|
if (file_mode & S_IXOTH)
|
|
new_mode |= S_IXUSR;
|
|
}
|
|
if (ugo[1] || honor_umask)
|
|
{
|
|
if (file_mode & S_IROTH)
|
|
new_mode |= S_IRGRP;
|
|
if (file_mode & S_IWOTH)
|
|
new_mode |= S_IWGRP;
|
|
if (file_mode & S_IXOTH)
|
|
new_mode |= S_IXGRP;
|
|
}
|
|
}
|
|
#endif /* __MINGW32__ */
|
|
|
|
#ifdef HAVE_UMASK
|
|
if (honor_umask)
|
|
new_mode &= ~mode_mask;
|
|
#endif
|
|
|
|
if (set_mode == 1)
|
|
{
|
|
#ifdef __MINGW32__
|
|
if (ugo[0] || honor_umask)
|
|
file_mode = (file_mode & ~(_S_IWRITE | _S_IREAD))
|
|
| (new_mode & (_S_IWRITE | _S_IREAD));
|
|
#else
|
|
/* Set '='. */
|
|
if ((ugo[0] || honor_umask) && !rwxXstugo[6])
|
|
file_mode = (file_mode & ~(S_ISUID | S_IRUSR | S_IWUSR | S_IXUSR))
|
|
| (new_mode & (S_ISUID | S_IRUSR | S_IWUSR | S_IXUSR));
|
|
if ((ugo[1] || honor_umask) && !rwxXstugo[7])
|
|
file_mode = (file_mode & ~(S_ISGID | S_IRGRP | S_IWGRP | S_IXGRP))
|
|
| (new_mode & (S_ISGID | S_IRGRP | S_IWGRP | S_IXGRP));
|
|
if ((ugo[2] || honor_umask) && !rwxXstugo[8])
|
|
file_mode = (file_mode & ~(S_IROTH | S_IWOTH | S_IXOTH))
|
|
| (new_mode & (S_IROTH | S_IWOTH | S_IXOTH));
|
|
#ifndef __VXWORKS__
|
|
if (is_dir && rwxXstugo[5])
|
|
file_mode |= S_ISVTX;
|
|
else if (!is_dir)
|
|
file_mode &= ~S_ISVTX;
|
|
#endif
|
|
#endif
|
|
}
|
|
else if (set_mode == 2)
|
|
{
|
|
/* Clear '-'. */
|
|
file_mode &= ~new_mode;
|
|
#if !defined( __MINGW32__) && !defined (__VXWORKS__)
|
|
if (rwxXstugo[5] || !is_dir)
|
|
file_mode &= ~S_ISVTX;
|
|
#endif
|
|
}
|
|
else if (set_mode == 3)
|
|
{
|
|
file_mode |= new_mode;
|
|
#if !defined (__MINGW32__) && !defined (__VXWORKS__)
|
|
if (rwxXstugo[5] && is_dir)
|
|
file_mode |= S_ISVTX;
|
|
else if (!is_dir)
|
|
file_mode &= ~S_ISVTX;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
return chmod (file, file_mode);
|
|
}
|
|
|
|
|
|
extern int chmod_func (char *, char *, gfc_charlen_type, gfc_charlen_type);
|
|
export_proto(chmod_func);
|
|
|
|
int
|
|
chmod_func (char *name, char *mode, gfc_charlen_type name_len,
|
|
gfc_charlen_type mode_len)
|
|
{
|
|
char *cname = fc_strdup (name, name_len);
|
|
int ret = chmod_internal (cname, mode, mode_len);
|
|
free (cname);
|
|
return ret;
|
|
}
|
|
|
|
|
|
extern void chmod_i4_sub (char *, char *, GFC_INTEGER_4 *,
|
|
gfc_charlen_type, gfc_charlen_type);
|
|
export_proto(chmod_i4_sub);
|
|
|
|
void
|
|
chmod_i4_sub (char *name, char *mode, GFC_INTEGER_4 * status,
|
|
gfc_charlen_type name_len, gfc_charlen_type mode_len)
|
|
{
|
|
int val;
|
|
|
|
val = chmod_func (name, mode, name_len, mode_len);
|
|
if (status)
|
|
*status = val;
|
|
}
|
|
|
|
|
|
extern void chmod_i8_sub (char *, char *, GFC_INTEGER_8 *,
|
|
gfc_charlen_type, gfc_charlen_type);
|
|
export_proto(chmod_i8_sub);
|
|
|
|
void
|
|
chmod_i8_sub (char *name, char *mode, GFC_INTEGER_8 * status,
|
|
gfc_charlen_type name_len, gfc_charlen_type mode_len)
|
|
{
|
|
int val;
|
|
|
|
val = chmod_func (name, mode, name_len, mode_len);
|
|
if (status)
|
|
*status = val;
|
|
}
|
|
|
|
#endif
|