perl592delta.1

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

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.\" ========================================================================
.\"
.IX Title "PERL592DELTA 1"
.TH PERL592DELTA 1 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
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.SH "NAME"
perl592delta \- what is new for perl v5.9.2
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This document describes differences between the 5.9.1 and the 5.9.2
development releases. See perl590delta and perl591delta for the
differences between 5.8.0 and 5.9.1.
.SH "Incompatible Changes"
.IX Header "Incompatible Changes"
.Sh "Packing and \s-1UTF\-8\s0 strings"
.IX Subsection "Packing and UTF-8 strings"
The semantics of \fIpack()\fR and \fIunpack()\fR regarding UTF\-8\-encoded data has been
changed. Processing is now by default character per character instead of
byte per byte on the underlying encoding. Notably, code that used things
like \f(CW\*(C`pack("a*", $string)\*(C'\fR to see through the encoding of string will now
simply get back the original \f(CW$string\fR. Packed strings can also get upgraded
during processing when you store upgraded characters. You can get the old
behaviour by using \f(CW\*(C`use bytes\*(C'\fR.
.PP
To be consistent with \fIpack()\fR, the \f(CW\*(C`C0\*(C'\fR in \fIunpack()\fR templates indicates
that the data is to be processed in character mode, i.e. character by
character; on the contrary, \f(CW\*(C`U0\*(C'\fR in \fIunpack()\fR indicates \s-1UTF\-8\s0 mode, where
the packed string is processed in its UTF\-8\-encoded Unicode form on a byte
by byte basis. This is reversed with regard to perl 5.8.X.
.PP
Moreover, \f(CW\*(C`C0\*(C'\fR and \f(CW\*(C`U0\*(C'\fR can also be used in \fIpack()\fR templates to specify
respectively character and byte modes.
.PP
\&\f(CW\*(C`C0\*(C'\fR and \f(CW\*(C`U0\*(C'\fR in the middle of a pack or unpack format now switch to the
specified encoding mode, honoring parens grouping. Previously, parens were
ignored.
.PP
Also, there is a new \fIpack()\fR character format, \f(CW\*(C`W\*(C'\fR, which is intended to
replace the old \f(CW\*(C`C\*(C'\fR. \f(CW\*(C`C\*(C'\fR is kept for unsigned chars coded as bytes in
the strings internal representation. \f(CW\*(C`W\*(C'\fR represents unsigned (logical)
character values, which can be greater than 255. It is therefore more
robust when dealing with potentially UTF\-8\-encoded data (as \f(CW\*(C`C\*(C'\fR will wrap
values outside the range 0..255, and not respect the string encoding).
.PP
In practice, that means that pack formats are now encoding-neutral, except
\&\f(CW\*(C`C\*(C'\fR.
.PP
For consistency, \f(CW\*(C`A\*(C'\fR in \fIunpack()\fR format now trims all Unicode whitespace
from the end of the string. Before perl 5.9.2, it used to strip only the
classical \s-1ASCII\s0 space characters.
.Sh "Miscellaneous"
.IX Subsection "Miscellaneous"
The internal dump output has been improved, so that non-printable characters
such as newline and backspace are output in \f(CW\*(C`\ex\*(C'\fR notation, rather than
octal.
.PP
The \fB\-C\fR option can no longer be used on the \f(CW\*(C`#!\*(C'\fR line. It wasn't
working there anyway.
.SH "Core Enhancements"
.IX Header "Core Enhancements"
.Sh "Malloc wrapping"
.IX Subsection "Malloc wrapping"
Perl can now be built to detect attempts to assign pathologically large chunks
of memory.  Previously such assignments would suffer from integer wrap-around
during size calculations causing a misallocation, which would crash perl, and
could theoretically be used for \*(L"stack smashing\*(R" attacks.  The wrapping
defaults to enabled on platforms where we know it works (most \s-1AIX\s0
configurations, BSDi, Darwin, \s-1DEC\s0 \s-1OSF/1\s0, FreeBSD, HP-UX, \s-1GNU\s0 Linux, OpenBSD,
Solaris, \s-1VMS\s0 and most Win32 compilers) and defaults to disabled on other
platforms.
.Sh "Unicode Character Database 4.0.1"
.IX Subsection "Unicode Character Database 4.0.1"
The copy of the Unicode Character Database included in Perl 5.9 has
been updated to 4.0.1 from 4.0.0.
.Sh "suidperl less insecure"