home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
OS/2 Shareware BBS: 10 Tools
/
10-Tools.zip
/
mitsch75.zip
/
scheme-7_5_17-src.zip
/
scheme-7.5.17
/
src
/
microcode
/
prosfs.c
< prev
next >
Wrap
C/C++ Source or Header
|
2001-05-08
|
10KB
|
313 lines
/* -*-C-*-
$Id: prosfs.c,v 1.16 2001/05/09 03:15:11 cph Exp $
Copyright (c) 1987-2001 Massachusetts Institute of Technology
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 2 of the License, 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
*/
/* Primitives to perform file-system operations. */
#include "scheme.h"
#include "prims.h"
#include "osfile.h"
#include "osfs.h"
#include "osio.h"
extern int EXFUN (OS_channel_copy,
(off_t source_length,
Tchannel source_channel,
Tchannel destination_channel));
extern void EXFUN (OS_file_copy, (CONST char *, CONST char *));
#define STRING_RESULT(expression) \
{ \
CONST char * result = (expression); \
PRIMITIVE_RETURN \
((result == 0) \
? SHARP_F \
: (char_pointer_to_string ((unsigned char *) result))); \
}
DEFINE_PRIMITIVE ("FILE-EXISTS?", Prim_file_exists_p, 1, 1,
"Return #T iff FILENAME refers to an existing file.\n\
Return #F if the file doesn't exist.\n\
Return zero if it's a symbolic link that points to a nonexisting file.\n\
Signal an error if the file's existence is indeterminate.")
{
PRIMITIVE_HEADER (1);
{
enum file_existence result = (OS_file_existence_test (STRING_ARG (1)));
PRIMITIVE_RETURN
((result == file_doesnt_exist)
? SHARP_F
: (result == file_does_exist)
? SHARP_T
: FIXNUM_ZERO);
}
}
DEFINE_PRIMITIVE ("FILE-EXISTS-DIRECT?", Prim_file_exists_direct_p, 1, 1,
"Return #T iff FILENAME refers to an existing file.\n\
Return #F if the file doesn't exist.\n\
Return zero if it's a symbolic link.\n\
Signal an error if the file's existence is indeterminate.")
{
PRIMITIVE_HEADER (1);
{
enum file_existence result
= (OS_file_existence_test_direct (STRING_ARG (1)));
PRIMITIVE_RETURN
((result == file_doesnt_exist)
? SHARP_F
: (result == file_does_exist)
? SHARP_T
: FIXNUM_ZERO);
}
}
DEFINE_PRIMITIVE ("FILE-TYPE-DIRECT", Prim_file_type_direct, 1, 1,
"Return type of FILE, as an exact non-negative integer.\n\
Don't indirect through symbolic links.")
{
PRIMITIVE_HEADER (1);
{
enum file_type t = (OS_file_type_direct (STRING_ARG (1)));
PRIMITIVE_RETURN
((t == file_type_nonexistent)
? SHARP_F
: (ulong_to_integer ((unsigned long) t)));
}
}
DEFINE_PRIMITIVE ("FILE-TYPE-INDIRECT", Prim_file_type_indirect, 1, 1,
"Return type of FILE, as an exact non-negative integer.\n\
Indirect through symbolic links.")
{
PRIMITIVE_HEADER (1);
{
enum file_type t = (OS_file_type_indirect (STRING_ARG (1)));
PRIMITIVE_RETURN
((t == file_type_nonexistent)
? SHARP_F
: (ulong_to_integer ((unsigned long) t)));
}
}
DEFINE_PRIMITIVE ("FILE-ACCESS", Prim_file_access, 2, 2,
"Return #T iff FILENAME exists and is accessible according to MODE.\n\
MODE is an integer between 0 and 7 inclusive, bitwise encoded:\n\
4 ==> file is readable;\n\
2 ==> file is writable;\n\
1 ==> file is executable.")
{
PRIMITIVE_HEADER (2);
PRIMITIVE_RETURN
(BOOLEAN_TO_OBJECT
(OS_file_access ((STRING_ARG (1)), (arg_index_integer (2, 8)))));
}
DEFINE_PRIMITIVE ("FILE-DIRECTORY?", Prim_file_directory_p, 1, 1,
"Return #T iff FILENAME refers to an existing directory.\n\
Otherwise #F is returned, meaning either that FILENAME doesn't exist\n\
or that it isn't a directory.")
{
PRIMITIVE_HEADER (1);
PRIMITIVE_RETURN (BOOLEAN_TO_OBJECT (OS_file_directory_p (STRING_ARG (1))));
}
DEFINE_PRIMITIVE ("FILE-SOFT-LINK?", Prim_file_soft_link_p, 1, 1,
"Iff FILENAME refers to an existing soft link, return the link contents.\n\
Otherwise #F is returned, meaning either that FILENAME doesn't exist\n\
or that it isn't a soft link.")
{
PRIMITIVE_HEADER (1);
STRING_RESULT (OS_file_soft_link_p (STRING_ARG (1)));
}
DEFINE_PRIMITIVE ("FILE-REMOVE", Prim_file_remove, 1, 1,
"Delete file FILENAME.\n\
If FILENAME is a soft link, the link is deleted.")
{
PRIMITIVE_HEADER (1);
OS_file_remove (STRING_ARG (1));
PRIMITIVE_RETURN (UNSPECIFIC);
}
DEFINE_PRIMITIVE ("FILE-REMOVE-LINK", Prim_file_remove_link, 1, 1,
"If file FILENAME is a link to another file (hard or soft), remove it.")
{
PRIMITIVE_HEADER (1);
OS_file_remove_link (STRING_ARG (1));
PRIMITIVE_RETURN (UNSPECIFIC);
}
DEFINE_PRIMITIVE ("FILE-RENAME", Prim_file_rename, 2, 2,
"Rename file FROM-NAME to TO-NAME.")
{
PRIMITIVE_HEADER (2);
OS_file_rename ((STRING_ARG (1)), (STRING_ARG (2)));
PRIMITIVE_RETURN (UNSPECIFIC);
}
DEFINE_PRIMITIVE ("FILE-LINK-HARD", Prim_file_link_hard, 2, 2,
"Create a hard link from file FROM-NAME to file TO-NAME.\n\
TO-NAME becomes another name for the file FROM-NAME.")
{
PRIMITIVE_HEADER (2);
OS_file_link_hard ((STRING_ARG (1)), (STRING_ARG (2)));
PRIMITIVE_RETURN (UNSPECIFIC);
}
DEFINE_PRIMITIVE ("FILE-LINK-SOFT", Prim_file_link_soft, 2, 2,
"Create a soft link from file FROM-NAME to file TO-NAME.\n\
TO-NAME becomes a soft link containing the string FROM-NAME.")
{
PRIMITIVE_HEADER (2);
OS_file_link_soft ((STRING_ARG (1)), (STRING_ARG (2)));
PRIMITIVE_RETURN (UNSPECIFIC);
}
DEFINE_PRIMITIVE ("LINK-FILE", Prim_link_file, 3, 3,
"This is an obsolete primitive. Use `file-link-hard' or `file-link-soft'.\n\
Create a new name for file FROM-NAME, called TO-NAME.\n\
If third arg HARD? is #F, a soft link is created;\n\
otherwise a hard link is created.")
{
PRIMITIVE_HEADER (3);
{
CONST char * from_name = (STRING_ARG (1));
CONST char * to_name = (STRING_ARG (2));
if ((ARG_REF (3)) != SHARP_F)
OS_file_link_hard (from_name, to_name);
else
OS_file_link_soft (from_name, to_name);
}
PRIMITIVE_RETURN (UNSPECIFIC);
}
#ifndef FILE_COPY_BUFFER_LENGTH
#define FILE_COPY_BUFFER_LENGTH 8192
#endif
int
DEFUN (OS_channel_copy, (source_length, source_channel, destination_channel),
off_t source_length AND
Tchannel source_channel AND
Tchannel destination_channel)
{
char buffer [FILE_COPY_BUFFER_LENGTH];
off_t transfer_length =
((source_length > (sizeof (buffer))) ? (sizeof (buffer)) : source_length);
while (source_length > 0)
{
long nread =
(OS_channel_read (source_channel, buffer, transfer_length));
if (nread <= 0)
{
return (-1);
}
if ((OS_channel_write (destination_channel, buffer, nread)) <
nread)
{
return (-1);
}
source_length -= nread;
if (source_length < (sizeof (buffer)))
transfer_length = source_length;
}
return (0);
}
DEFINE_PRIMITIVE ("FILE-COPY", Prim_file_copy, 2, 2,
"Make a new copy of the file FROM-NAME, called TO-NAME.")
{
PRIMITIVE_HEADER (2);
OS_file_copy ((STRING_ARG (1)), (STRING_ARG (2)));
PRIMITIVE_RETURN (UNSPECIFIC);
}
DEFINE_PRIMITIVE ("DIRECTORY-MAKE", Prim_directory_make, 1, 1,
"Create a new directory, called NAME.")
{
PRIMITIVE_HEADER (1);
OS_directory_make (STRING_ARG (1));
PRIMITIVE_RETURN (UNSPECIFIC);
}
DEFINE_PRIMITIVE ("DIRECTORY-DELETE", Prim_directory_delete, 1, 1,
"Delete directory called NAME.")
{
PRIMITIVE_HEADER (1);
OS_directory_delete (STRING_ARG (1));
PRIMITIVE_RETURN (UNSPECIFIC);
}
DEFINE_PRIMITIVE ("FILE-TOUCH", Prim_file_touch, 1, 1,
"Given a file name, change the times of the file to the current time.\n\
If the file does not exist, create it.\n\
Both the access time and modification time are changed.\n\
Return #F if the file existed and its time was modified.\n\
Otherwise the file did not exist and it was created.")
{
PRIMITIVE_HEADER (1);
PRIMITIVE_RETURN
(BOOLEAN_TO_OBJECT (OS_file_touch ((CONST char *) (STRING_ARG (1)))));
}
DEFINE_PRIMITIVE ("NEW-DIRECTORY-OPEN", Prim_new_directory_open, 1, 1,
"Open the directory NAME for reading, returning a directory number.")
{
PRIMITIVE_HEADER (1);
PRIMITIVE_RETURN (long_to_integer (OS_directory_open (STRING_ARG (1))));
}
static unsigned int
DEFUN (arg_directory_index, (argument), unsigned int argument)
{
long index = (arg_integer (argument));
if (! (OS_directory_valid_p (index)))
error_bad_range_arg (argument);
return (index);
}
DEFINE_PRIMITIVE ("NEW-DIRECTORY-CLOSE", Prim_new_directory_close, 1, 1,
"Close DIRECTORY.")
{
PRIMITIVE_HEADER (1);
OS_directory_close (arg_directory_index (1));
PRIMITIVE_RETURN (UNSPECIFIC);
}
DEFINE_PRIMITIVE ("NEW-DIRECTORY-READ", Prim_new_directory_read, 1, 1,
"Read and return a filename from DIRECTORY, or #F if no more files.")
{
PRIMITIVE_HEADER (1);
STRING_RESULT (OS_directory_read (arg_directory_index (1)));
}
DEFINE_PRIMITIVE ("NEW-DIRECTORY-READ-MATCHING", Prim_new_directory_read_match, 2, 2,
"Read and return a filename from DIRECTORY.\n\
The filename must begin with the STRING.\n\
Return #F if there are no more matching files in the directory.")
{
PRIMITIVE_HEADER (2);
STRING_RESULT
(OS_directory_read_matching ((arg_directory_index (1)), (STRING_ARG (2))));
}