Porblem with strtok

Hi,

I'm using strtok to parse the a string using '|' as the delimiter...It worked fine as long as none of the fields were empty, i.e. text1|text2|text3 worked, but text1||text3 did not. It skipped text2 and returned text3.

could anyone please help me out with this problem..is ther any way to solve it?? how to capture null in field using strtok.?? ur help will be greatly appreciated

thanks in advance

pokks.

https://cboard.cprogramming.com/showthread.php?p=523273

Quote:

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Originally Posted by man strtok

A `token' is a nonempty string of characters not occurring in the string delim, followed by \0 or by a character occurring in delim.

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This should explain why it will not work with strtok().

Quote:

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Originally Posted by pokks

Hi,

I'm using strtok to parse the a string using '|' as the delimiter...It worked fine as long as none of the fields were empty, i.e. text1|text2|text3 worked, but text1||text3 did not. It skipped text2 and returned text3.

could anyone please help me out with this problem..is ther any way to solve it?? how to capture null in field using strtok.?? ur help will be greatly appreciated

thanks in advance

pokks.

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Sounds like it's working as intended ?

It skipped "text2" because "text2" did not exist, there was no token.

Quote:

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A âtokenâ is a nonempty string of characters not occurring in the
string delim, followed by \0 or by a character occurring in delim.

---

Quote:

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If a token ends with a delimiter, this delimiting character is overâ
written with a \0 and a pointer to the next character is saved for the
next call to strtok().

---

Quote:

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Originally Posted by pokks

Hi,

I'm using strtok to parse the a string using '|' as the delimiter...It worked fine as long as none of the fields were empty, i.e. text1|text2|text3 worked, but text1||text3 did not. It skipped text2 and returned text3.

could anyone please help me out with this problem..is ther any way to solve it?? how to capture null in field using strtok.?? ur help will be greatly appreciated

thanks in advance

pokks.

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You could write strok2()

Code:

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char *strtok2 (char *Str, const char *Del)
{
  static char *OldStr = NULL;
  char        *Ptr;

  if (Str == NULL)
      if (OldStr == NULL)
        return NULL;
      else
        Str = OldStr;

  if (Str [0] == '\0') return NULL;

  Ptr = Str;
  while (*Ptr != '\0' && !IsDelim (*Ptr, Del))
      Ptr++;
  if (*Ptr != '\0') {
      *Ptr = '\0';
      OldStr = Ptr + 1;
      return Str;
  } else {
      OldStr = NULL;
      return Str;
  }
}

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Might one presume IsDelim to look something like this?

Code:

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int IsDelim(char Ch, const char *Del)
{
  for ( ; *Del; ++Del )
  {
      if ( Ch == *Del )
      {
        return 1;
      }
  }
  return 0;
}

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THANKS A LOT FOR ALL UR REPLIES!!!

It really helped me a lot!!

Thanks again,
Pokks.