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Full Discussion: Problem in getting the correct number from the string.
Top Forums Programming Problem in getting the correct number from the string. Post 302320812 by SamRoj on Friday 29th of May 2009 03:20:29 AM
Old 05-29-2009
Problem in getting the correct number from the string.
I have string named texts which consist of section label “BOOK-SEC-“. Section starts from 1 to n, where n is a number. For this example conside the value of n is 9. That is, the string variable looks like
“BOOK-SEC-1 blablgjfsdgdflgfablablablablaBOOK-SEC-2blablablabalasdfsdhfhBOOK-SEC-3blajgfyasdasdfgdagfblablaBOOK-SEC-4blablajahdu.....styadhsabfdaskfBOOK-SEC-9blablaahdfgablaz".
The data following the BOOK-SEC-1 belongs to section 1, the data following the BOOK-SEC-2 belongs to section 2 and so on.
See the below code:
#include<iostream>
#include<sstream>
using namespace std;
const std::string SECTION_LABEL ("BOOK-SEC-");
static unsigned int getNumberSections (const std::string &texts );
int main ()
{
string texts;
texts = "BOOK-SEC-1blablgjfsdgdflgfablablablablaBOOK-SEC-2blablablabalasdfsdhfhBOOK-SEC-3blajgfyasdasdfgdagfblablaBOOK-SEC\
-4blablaj......ahdustyadhsabfdaskfBOOK-SEC-9blablaahdfgablaz";
unsigned int number;
number = getNumberSections(texts);
cout<<"\n the number is: "<<number<<endl;
return 0;
}
unsigned int getNumberSections (const string & texts)
{
string::size_type pos = texts.rfind (SECTION_LABEL);
pos += SECTION_LABEL.length ();
string numberAsText;
while (isdigit (texts[pos]))
{
numberAsText.push_back (texts[pos]);
++pos;
}
return atoi (numberAsText.c_str ());
}

This gives the correct output: the number is: 9

The problem when the string looks like:
string texts;
texts = "BOOK-SEC-1blablgjfsdgdflgfablablablablaBOOK-SEC-2blablablabalasdfsdhfhBOOK-SEC-3blajgfyasdasdfgdagfblablaBOOK-SEC\
-4blablaj......ahdustyadhsabfdaskfBOOK-SEC-99blablaahdfgablaz";

check the part "BOOK-SEC-99blablaahdfgablaz. Here section is 9 and another 9 is the data of that section.
For this string I get the output as
the number is: 99
which is wrong.

please suggest a solution to get the correct value.

Note: In any case we should not alter the SECTION_LABEL or to distrub the string variable.
 

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LEARN ABOUT X11R4

tc-hfsc

HFSC(8) 							       Linux								   HFSC(8)

NAME

       HFSC - Hierarchical Fair Service Curve's control under linux

SYNOPSIS

       tc qdisc add ... hfsc [ default CLASSID ]

       tc class add ... hfsc [ [ rt SC ] [ ls SC ] | [ sc SC ] ] [ ul SC ]

       rt : realtime service curve
       ls : linkshare service curve
       sc : rt+ls service curve
       ul : upperlimit service curve

       o at least one of rt, ls or sc must be specified
       o ul can only be specified with ls or sc

       SC := [ [ m1 BPS ] d SEC ] m2 BPS
	      m1 : slope of the first segment
	      d  : x-coordinate of intersection
	      m2 : slope of the second segment

       SC := [ [ umax BYTE ] dmax SEC ] rate BPS
	      umax : maximum unit of work
	      dmax : maximum delay
	      rate : rate

       For description of BYTE, BPS and SEC - please see UNITS section of tc(8).

DESCRIPTION (qdisc)
       HFSC qdisc has only one optional parameter - default. CLASSID specifies the minor part of the default classid, where packets not classified
       by other means (e.g. u32 filter, CLASSIFY target of iptables) will be enqueued. If default is not specified, unclassified packets  will	be
       dropped.

DESCRIPTION (class)
       HFSC  class is used to create a class hierarchy for HFSC scheduler. For explanation of the algorithm, and the meaning behind rt, ls, sc and
       ul service curves - please refer to tc-hfsc(7).

       As you can see in SYNOPSIS, service curve (SC) can be specified in two ways. Either as maximum delay for certain amount of work,  or  as  a
       bandwidth assigned for certain amount of time. Obviously, m1 is simply umax/dmax.

       Both m2 and rate are mandatory. If you omit other parameters, you will specify linear service curve.

SEE ALSO

       tc(8), tc-hfsc(7), tc-stab(8)

       Please direct bugreports and patches to: <netdev@vger.kernel.org>

AUTHOR

       Manpage created by Michal Soltys (soltys@ziu.info)

iproute2							  31 October 2011							   HFSC(8)
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