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Top Forums Programming Is this string splitting function OK? Post 302236108 by kpedersen on Sunday 14th of September 2008 09:41:06 PM
Old 09-14-2008
Is this string splitting function OK?

[SIZE=2]Hello,

I am recently working on an application that sends large strings accross a network very often. These then need to be broken up first with '!' and then with ','. My current function (below) works fine for this when not too much data is being sent across the network but segfaults when a reasonable amount is sent across. Would anyone be so kind as to let me know if my function is flawed in some way and is causing the problem (such as memory leak etc...)
An example usage is...

Code:
string command = split_string(data, ",", 0);

The function is as follows...

Code:
string split_string(string input, string splitter, int number)
{
  int count = 0;
  string output;
  char* pch;
 
  for(int index = 0; index < input.length(); index++)
  {
    if(input[index] == splitter[0])
    {
      count++;
    }
  }
 
  if(count < number)
  {
    return "";
  }
 
  pch = new char[input.length() + 1];
  strcpy(pch, input.c_str());
  output = strtok(pch, splitter.c_str());
 

  for(int index = 0; index < number; index++)
  { 
    output = strtok(NULL, splitter.c_str());
  }
 
  return output;
}

Any help would be greatly appreciated!

Karsten
 

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SPLIT(1)							   User Commands							  SPLIT(1)

NAME
split - split a file into pieces SYNOPSIS
split [OPTION]... [INPUT [PREFIX]] DESCRIPTION
Output fixed-size pieces of INPUT to PREFIXaa, PREFIXab, ...; default size is 1000 lines, and default PREFIX is 'x'. With no INPUT, or when INPUT is -, read standard input. Mandatory arguments to long options are mandatory for short options too. -a, --suffix-length=N generate suffixes of length N (default 2) --additional-suffix=SUFFIX append an additional SUFFIX to file names -b, --bytes=SIZE put SIZE bytes per output file -C, --line-bytes=SIZE put at most SIZE bytes of lines per output file -d, --numeric-suffixes[=FROM] use numeric suffixes instead of alphabetic; FROM changes the start value (default 0) -e, --elide-empty-files do not generate empty output files with '-n' --filter=COMMAND write to shell COMMAND; file name is $FILE -l, --lines=NUMBER put NUMBER lines per output file -n, --number=CHUNKS generate CHUNKS output files; see explanation below -u, --unbuffered immediately copy input to output with '-n r/...' --verbose print a diagnostic just before each output file is opened --help display this help and exit --version output version information and exit SIZE is an integer and optional unit (example: 10M is 10*1024*1024). Units are K, M, G, T, P, E, Z, Y (powers of 1024) or KB, MB, ... (powers of 1000). CHUNKS may be: N split into N files based on size of input K/N output Kth of N to stdout l/N split into N files without splitting lines l/K/N output Kth of N to stdout without splitting lines r/N like 'l' but use round robin distribution r/K/N like- wise but only output Kth of N to stdout GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report split translation bugs to <http://translationproject.org/team/> AUTHOR
Written by Torbjorn Granlund and Richard M. Stallman. COPYRIGHT
Copyright (C) 2013 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for split is maintained as a Texinfo manual. If the info and split programs are properly installed at your site, the command info coreutils 'split invocation' should give you access to the complete manual. GNU coreutils 8.22 June 2014 SPLIT(1)
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