03-11-2011
It sounds like the same or similar problem as scanf() in C: It throws up on bad data but doesn't actually
discard the bad data.
In C the usual approach is to read strings line-by-line with fgets or getline (fgets preferred because there's some
very broken getline implementations out there), then feed the line into
sscanf. Whether sscanf succeeds or not, the data is out of the input stream and out of your way.
C++ doesn't have special string-only functions, it uses
stringstream to make a string act like
ss>>var>>var; instead. Whether reading your vars from the string succeeds or not, the data is out of cin and can't come back to haunt you.
Here's an example.
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LEARN ABOUT DEBIAN
text::context
Text::Context(3pm) User Contributed Perl Documentation Text::Context(3pm)
NAME
Text::Context - Handle highlighting search result context snippets
SYNOPSIS
use Text::Context;
my $snippet = Text::Context->new($text, @keywords);
$snippet->keywords("foo", "bar"); # In case you change your mind
print $snippet->as_html;
print $snippet->as_text;
DESCRIPTION
Given a piece of text and some search terms, produces an object which locates the search terms in the message, extracts a reasonable-length
string containing all the search terms, and optionally dumps the string out as HTML text with the search terms highlighted in bold.
new
Creates a new snippet object for holding and formatting context for search terms.
keywords
Accessor method to get/set keywords. As the context search is done case-insensitively, the keywords will be lower-cased.
paras
@paras = $self->paras($maxlen)
Return shortened paragraphs to fit together into a snippet of at most $maxlen characters.
as_text
Calculates a "representative" string which contains the given search terms. If there's lots and lots of context between the terms, it's
replaced with an ellipsis.
as_html([ start => "<some tag>", end => "<some end tag>" ])
Markup the snippet as a HTML string using the specified delimiters or with a default set of delimiters ("<span class="quoted">").
AUTHOR
Original author: Simon Cozens
Current maintainer: Tony Bowden
BUGS and QUERIES
Please direct all correspondence regarding this module to:
bug-Text-Context@rt.cpan.org
COPYRIGHT AND LICENSE
Copyright (C) 2002-2005 Kasei
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License; 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.
perl v5.10.1 2009-07-23 Text::Context(3pm)