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Wierd C program. Help Needed
Post 302145385 by karthikb23 on Wednesday 14th of November 2007 04:28:05 AM
11-14-2007
Wierd C program. Help Needed
Hi,
Please see this:
When i make a declaration as:
char *i, j[15], *k;
and then do
sprintf( k, "print.sh %s", i );
the program works fine.
But when i change the declaration to:
char *i, *k;
and then do
sprintf( k, "print.sh %s", i );
I get a segmentation fault at the 'sprintf' statement.
The program works only when j is an array of 15. Nothing less/more
Please Note: variable j is just a dummy. I do absolutely nothing with it.
Also, i know using sprintf the way i have done is illegal. The pointer is not assigned to anything, prior to such a statement.
It may be silly
but could someone please explain why this happens? Guess something to do with the way memory is allocated.
Thanks in advance!
Please see this:
When i make a declaration as:
char *i, j[15], *k;
and then do
sprintf( k, "print.sh %s", i );
the program works fine.
But when i change the declaration to:
char *i, *k;
and then do
sprintf( k, "print.sh %s", i );
I get a segmentation fault at the 'sprintf' statement.
The program works only when j is an array of 15. Nothing less/more
Please Note: variable j is just a dummy. I do absolutely nothing with it.
Also, i know using sprintf the way i have done is illegal. The pointer is not assigned to anything, prior to such a statement.
It may be silly
but could someone please explain why this happens? Guess something to do with the way memory is allocated.Thanks in advance!
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LEARN ABOUT DEBIAN
html::formfu::filter::compoundsprintf
HTML::FormFu::Filter::CompoundSprintf(3pm) User Contributed Perl Documentation HTML::FormFu::Filter::CompoundSprintf(3pm) NAME
HTML::FormFu::Filter::CompoundSprintf - CompoundSprintf filter SYNOPSIS
--- element: - type: Multi name: date elements: - name: day - name: month - name: year filter: - type: CompoundSprintf sprintf: '%02d-%02d-%04d' # get the compound-value my $date = $form->param_value('date'); DESCRIPTION
For use with a HTML::FormFu::Element::Multi group of fields. Uses a sprintf pattern to join the input from several fields into a single value. METHODS
sprintf Arguments: $string "sprintf" pattern used to join the individually submitted parts. The pattern is passed to the perl-core "sprintf" function. field_order Inherited. See "field_order" in HTML::FormFu::Filter::_Compound for details. --- element: - type: Multi name: date elements: - name: month - name: day - name year filter: - type: CompoundSprintf field_order: - day - month - year AUTHOR
Carl Franks, "cfranks@cpan.org" LICENSE
This library is free software, you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-01-23 HTML::FormFu::Filter::CompoundSprintf(3pm)