Programming

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* *From http://www.gsp.com/cgi-bin/man.cgi?section=3&topic=strtok_r
 A FreeBSD man pages  * */

int main()
{
    char string1[80];
    char *sep = "\\/:;=-";               /*Delimiters*/
    char *word, *tmp1;                   /*For the loop, *word is the return value, tmp1 is the temporary holder of the rest*/

    strcpy(string1, "This;is.a:test:of=the/string\\tokenizer-function.");

    while( (word=strtok_r(string1, sep, &tmp1)) != NULL) {   
        printf("So far we're at %s\n", word);
        string1 = tmp1;                             //Want move string1 to the next token. Error!!!
    }
    return 0;
}

error: incompatible types when assigning to type ‘char[80]’ from type ‘char *’

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* *From http://www.gsp.com/cgi-bin/man.cgi?section=3&topic=strtok_r
 A FreeBSD man pages  * */

int main()
{
    char string1[80]="This;is.a:test:of=the/string\\tokenizer-function."; // You can assign directly, without strcpy
    const char *sep = "\\/:;=-";               /*Delimiters*/
    char *word, *tmp1;                   /*For the loop, *word is the return value, tmp1 is the temporary holder of the rest*/

    word=strtok_r(string1, sep, &tmp1);

    while(word != NULL)
    {
        printf("word = '%s'\n", word);
        word=strtok_r(NULL, sep, &tmp1);
    }

    return 0;
}

$ gcc strtok.c
$ ./a.out

word = 'This'
word = 'is.a'
word = 'test'
word = 'of'
word = 'the'
word = 'string'
word = 'tokenizer'
word = 'function.'

$

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* Example how to use strtok_r() function
 *
 *From http://www.gsp.com/cgi-bin/man.cgi?section=3&topic=strtok_r
 A FreeBSD man pages
 * */

int main()
{
    char string1[80];
    char *sep = "\\/:;=-";            /*Delimiters*/
    char *word, *tmp1;                /*For the loop, *word is the return value, tmp1 to hold the rest of the parsed line */
    char *ptr;  
 
    //I want strcpy to handle FILE stream line-by-line later, if it is not the wrong way.
    strcpy(string1, "This;is.a:test:of=the/string\\tokenizer-function.");  
    ptr = string1;                    /*Extra variable to hold string1*/
    
    while( (word=strtok_r(ptr, sep, &tmp1)) != NULL) {
        printf("So far we're at %s\n", word);
        ptr = tmp1;  //string1 = tmp1;     //Want move string1 to the next token. Error!!! 
    }
    return 0;
}

char original_string[]="this is a string";
char *sep=" ";
char *token=strtok_r(original_string, sep, &tmp); // Give it the original string once and only once.

while(token != NULL)
{
        printf("token is '%s'\n", token);
        token=strtok_r(NULL, sep, &tmp); // Give it NULL.  Not the previous token.  Not the original string.  ONLY NULL!
}

word=strtok_r(ptr, sep, &tmp1))    //pop one token from the beginning, rest (&tmp1) is the left_over
ptr = tmp1;                      //move the pointer to the beginning of the rest (&tmp1)

...... on the first  call the 1st argument should point to the input string, then on the  following calls it (1st argument) should be NULL.

DESCRIPTION
       The strtok() function parses a string into a sequence  of  tokens.   On
       the  first call to strtok() the string to be parsed should be specified
       in str.  In each subsequent call that should parse the same string, str
       should be NULL.