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strtok_r (3)

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BSD mandoc

NAME



strtok , strtok_r

 - string tokens

LIBRARY

Lb libc

SYNOPSIS

#include <string.h>
char * strtok (char *str const char *sep);
char * strtok_r (char *str const char *sep char **last);

DESCRIPTION

Bf -symbolic This interface is obsoleted by strsep(3). Ef

The strtok ();
function is used to isolate sequential tokens in a null-terminated string, Fa str . These tokens are separated in the string by at least one of the characters in Fa sep . The first time that strtok ();
is called, Fa str should be specified; subsequent calls, wishing to obtain further tokens from the same string, should pass a null pointer instead. The separator string, Fa sep , must be supplied each time, and may change between calls.

The implementation will behave as if no library function calls strtok (.);

The strtok_r ();
function is a reentrant version of strtok (.);
The context pointer Fa last must be provided on each call. The strtok_r ();
function may also be used to nest two parsing loops within one another, as long as separate context pointers are used.

The strtok ();
and strtok_r ();
functions return a pointer to the beginning of each subsequent token in the string, after replacing the token itself with a NUL character. When no more tokens remain, a null pointer is returned.

EXAMPLES

The following uses strtok_r ();
to parse two strings using separate contexts:

char test[80], blah[80];
char *sep = "\\/:;=-";
char *word, *phrase, *brkt, *brkb;

strcpy(test, "This;is.a:test:of=the/string\\tokenizer-function.");

for (word = strtok_r(test, sep, &brkt);
     word;
     word = strtok_r(NULL, sep, &brkt))
{
    strcpy(blah, "blah:blat:blab:blag");

    for (phrase = strtok_r(blah, sep, &brkb);
         phrase;
         phrase = strtok_r(NULL, sep, &brkb))
    {
        printf("So far we're at %s:%s\n", word, phrase);
    }
}

STANDARDS

The strtok ();
function conforms to St -isoC .

AUTHORS

An Wes Peters , Softweyr LLC: Aq wes@softweyr.com

Based on the Fx 3.0 implementation.

BUGS

The System V strtok (,);
if handed a string containing only delimiter characters, will not alter the next starting point, so that a call to strtok ();
with a different (or empty) delimiter string may return a non- NULL value. Since this implementation always alters the next starting point, such a sequence of calls would always return NULL