strsep vs. strtok

irfanhab · 04-30-2004, 11:38 PM

Hi all,

I need to tokenize my string in a program, but using strtok, the original string is changed.
I read that strsep, leaves the original string unaltered.
Can anyone give me a sample code using strsep?
thanx

itsme86 · 05-01-2004, 01:08 AM

Code:

       char *strsep(char **stringp, const char *delim);

DESCRIPTION
       If  *stringp  is  NULL, the strsep() function returns NULL
       and does nothing else. Otherwise, this function finds  the
       first  token  in  the  string  *stringp,  where tokens are
       delimited by symbols in the string delim.  This  token  is
       terminated  with  a  `\0'  character  (by  overwriting the
       delimiter) and *stringp  is  updated  to  point  past  the
       token.  In case no delimiter was found, the token is taken
       to be the entire string *stringp,  and  *stringp  is  made
       NULL.

NOTES
       The strsep() function was introduced as a replacement  for
       strtok(),  since  the  latter  cannot handle empty fields.
       However, strtok() conforms to ANSI-C  and  hence  is  more
       portable.

I think you were misinformed...I made the most relevant information bold.

It's probably best to just duplicate the original string to use with strtok(). By using the strdup() function for instance.