ULOS 2

• Index

Contents

• Functions

Libraries

• syscalls
• argcompat
• copier
• getopt
• i18n
• permissions
• readline
• serialization
• sizes
• termio
• treeutil

Examples

• getopt.build.lua
• getopt.process.lua

Module permissions

Provides utilities for working with file permissions.

Functions

strtobmp (permstr)	Convert a string representation to a binary one.
bmptostr (bitmap)	Convert a bitmap representation to a string.
has_permission (mode, perm)	Check if a permission is set.

Functions

strtobmp (permstr)

Convert a string representation to a binary one. Takes a string in a form similar to that output by ls, and returns a number with the appropriate bits set. The string must be exactly nine characters long and in the format rwxrwxrwx, where any r, w, or x may be replaced by a -. For example, rwxrw-r--, r-xr-xr-x, and rw--wx--w- are all valid, but rwrwrw is not.

Parameters:

• permstr string The string to process

Returns:

number A numerical representation of the input string

bmptostr (bitmap)

Convert a bitmap representation to a string. The bitmap must be in the same format as a POSIX file mode - the same as that returned by strtobmp.

Parameters:

• bitmap number The permissions to process

Returns:

string A string representation, in the same form as passed to strtobmp.

has_permission (mode, perm)

Check if a permission is set. Checks if the given permission string, when ANDed with the given mode, is exactly returned. Relatively inflexible.

Parameters:

• mode number The file mode to check against
• perm string The permissions to check

Returns:

boolean Whether the given permission is set