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Maker PDF417 in Objective-C Standard Perl Library

Standard Perl Library
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This symbol set imports the following constants: F_OK R_OK SEEK_END STDIN_FILENO STRERR_FILENO X_OK _PC_LINK_MAX _PC_MAX_INPUT _PC_NO_TRUNC _PC_PIPE_BUF _POSIX_CHOWN_RESTRICTED _POSIX_NO_TRUNC _POSIX_VDISABLE _SC_ARG_MAX _SC_CLK_TCK _SC_NGROUPS_MAX _SC_SAVED_IDS _SC_TZNAME_MAX NULL SEEK_CUR SEEK_SET STDOUT_FILENO W_OK _PC_CHOWN_RESTRICTED _PC_MAX_CANON _PC_NAME_MAX _PC_PATH_MAX _PC_VDISABLE _POSIX_JOB_CONTROL _POSIX_SAVED_IDS _POSIX_VERSION _SC_CHILD_MAX _SC_JOB_CONTROL _SC_OPEN_MAX _SC_STREAM_MAX _SC_VERSION
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References
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s 6, 10, 11, 12, 13, 14, 15, 21, 22, Appendix A
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Safe
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This module creates a safe compartment for executing a Perl script
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APPENDIXES use Safe; $compartment = new Safe;
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Perl: The Complete Reference
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The created compartment has the following attributes: I A new name space The new package has a new root name space, and code within the compartment cannot access the variables outside of this root name space The parent script can optionally insert new variables into the name space, but the reverse is not true Only the underscore variables ($_, @_, and %_) are shared between the parent and safe compartment I An operator mask This is generated using the opcode names and tags as defined in the Opcode module Executing code within the new compartment that contains a masked operator will cause the compilation of the code to fail By default, the operator mask uses the :default opcode set To create a new compartment:
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$compartment = new Safe;
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An optional argument specifies the name of the new root name space The module then supports the following methods
permit(OP, )
adds the specified opcodes or sets to the mask when compiling code in the compartment
permit_only(OP, )
exclusively sets the specified opcodes or sets in the mask when compiling code in the compartment
deny(OP, )
deletes the specified opcodes or sets from the current mask
deny_only(OP, )
denies only the listed opcodes or sets
trap(OP, )
Appendix B:
Standard Perl Library
is synonymous with deny
untrap(OP, )
is synonymous with permit
share(NAME, )
shares the specified variables with the compartment
share_from(PACKAGE, ARRAY)
shares the list of symbols defined in the array of references ARRAY from the specified PACKAGE with the compartment
varglob(VARNAME)
returns a glob reference for the symbol table entry of VARNAME with the package of the compartment
reval(STRING)
evaluates STRING within the compartment
rdo(FILENAME)
executes the script FILENAME in the compartment
root(NAMESPACE)
returns the name of the package that is the root of the compartment s name space
mask(MASK)
APPENDIXES
When MASK is not specified, returns the entire operator mask for the compartment If MASK is specified, then it sets the compartment s operator mask
References
15; see also Opcode, ops
Perl: The Complete Reference
SDBM_File
use SDBM_File; use Fcntl; tie(%db, 'SDBM_File', 'db', O_RDWR|O_CREAT, 0640); untie %db;
This is an interface supporting access to the Perl-supplied SDBM database using tie
References
ODBM_File
13; see also AnyDBM_File, DB_File, GDBM_File, NDBM_File,
Search::Dict
use Search::Dict; look *FILEHANDLE, $key, $dict, $fold;
The look function sets the current location within the FILEHANDLE to the first occurrence of $key, or the closest match that is greater than or equal to it This can be used, as the name suggests, to locate a word within a dictionary that lists words, one per line If $dict is true, the search is conducted in strict dictionary (alphabetical) order, ignoring everything that is not a word character The dictionary file should have been sorted with the Unix sort command and the -d option If $fold is true, the case is ignored
References
13; see also Text::Abbrev, Text::Soundex
SelectSaver
This module provides an alternative to the select function for selecting the default output filehandle
use SelectSaver;
You use it within a block:
Appendix B:
Standard Perl Library
use SelectSaver; #STDOUT is selected { my $saver = new SelectSaver(MYOUT); #MYOUT is selected } #STDOUT is selected again
Once the block exits, the selected filehandle returns to the value selected before the block
References
s 4, 7
SelfLoader
This module provides a system similar to AutoLoader except that functions are self-loaded from the script rather than from separate files
package MyPackage; use SelfLoader;
Like AutoLoader, the module delays the loading of functions until they are called Unlike AutoLoader, the functions themselves are defined after the _ _DATA_ _ token This token signifies to Perl that the code to be compiled has ended, and the functions defined in _ _DATA_ _ are available via the MyPackage::DATA filehandle The _ _DATA_ _ definitions for a single package can span multiple files, but the last _ _DATA_ _ token in a given package is the one accessible via the MyPackage::DATA filehandle Reading from the DATA filehandle ends when it sees the _ _END_ _ token But it will restart if the _ _END_ _ token is immediately followed by a DATA token (not to be confused with the _ _DATA_ _ token) The method used by the SelfLoader package is to read in the contents of the filehandle to identify the defined functions When the function is first called, it uses eval to parse the requested subroutine The SelfLoader exports an AUTOLOAD subroutine to be used for loading the packages from the DATA filehandle Unlike AutoLoader, there is a small overhead for having the definitions parsed once at compile time Other than that, execution will seem faster because functions are only compiled when used, thus negating the need to compile unused functions There is no advantage to defining often-used functions with SelfLoader Note that lexically defined values (via my) are visible to functions only up to the _ _DATA_ _ token Functions that rely on lexicals cannot be autoloaded, either by
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