Strtok-assigning tokens to structure

[anya]

Hello everyone...I need to parse some text, I gave a some string just for
example.
But I don't know, how to this tokens from strtok assign to different fileds of structure ? (a,b,c,d,e,f,g). For example:

a=this
b=is
c=test
d= string etc.

Please, if you have advice to help me.

[tag]

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


typedef struct {
    
    char *a;
    char *b; 
    char *c; 
    int d; 
    char *e; 
    char *f;
    char *g; 
    
} struct_test;


int main ()
 {
    char str[] = "this is a test string::\r\n"
               "value1: 5\r\n"
               "value2: 67\r\n\r\n";
               
               char *line;
               char *token;
               char buf[256];
  
  
  struct_test test;

 for (line = strtok (str, "\r\n"); line != NULL; line = strtok (line + strlen (line) + 1, "\r\n")) {
      
      strncpy (buf, line, sizeof (buf));
      printf ("Line: %s\n",buf);
    
  
    for (token = strtok (buf, " "); token != NULL; token = strtok (token + strlen (token) + 1, " ")){
         printf ("\tToken: %s\n",token);
        
        
        }
        
    }
        
    
return 0;


}

[/tag]

[Click_here]

Hey there

Have a good look at the example here - strtok, wcstok, _mbstok (CRT)

[AndiPersti]

FAQ > Separate a string into tokens? (C) - Cprogramming.com

You can't use strtok() on two different strings at the same time (as you do in your nested for-loops).

Bye, Andreas

[Click_here]

I also found this that might help
Storing a string inside an array?

[anya]

I also found these examples , but there is no explanation how to assigns this tokens to structure....
AndiPersti, how I can't use it? This code is working...I got tokens, I need just to assigns them to structure :S

Thx to all

[anya]

I also found this that might help
Storing a string inside an array?

This is similar with my code, but there is no explanation how to assign token to some fileld in structure?

[Malcolm McLean]

strtok() is a bit difficult to use.
It stores the string it is working on in a global variable. Then it corrupts that string by adding nuls to create the tokens.

You can assign tokens to a structure with code like

struct_test temp;

temp.d = atoi(token);

A long-term better solution is to use regular expressions. Unfortunately the C standard runtime library doesn't include them, though most compilers will have them installed. Look for regexpr() inthe documentation.

[anya]

I wanted to avoid regular expressions.
Just to ask, from your example every token will be assigned to temp.d. Can I achieve to assign
first token to temp.d,
second token to temp.e,
third to temp.f etc.

Is there a way to do this?

I must to parse HTTP ....I thought that strtok() will solve all my problems, ...now I don't have idea ...

Thanks very much

strtok() is a bit difficult to use.
It stores the string it is working on in a global variable. Then it corrupts that string by adding nuls to create the tokens.

You can assign tokens to a structure with code like

struct_test temp;

temp.d = atoi(token);

A long-term better solution is to use regular expressions. Unfortunately the C standard runtime library doesn't include them, though most compilers will have them installed. Look for regexpr() inthe documentation.

[AndiPersti]

AndiPersti, how I can't use it? This code is working...I got tokens, I need just to assigns them to structure :S

You're right. I misread your usage of strtok().

Assigning a token to a pointer is the same as assigning any other string to a pointer. You have char pointers in your structure so you could just do something like

temp.a = token;

or you could allocate memory for each pointer and then copy the token string to that memory location using strcpy():

strcpy(temp.a, token);  // assuming you have allocated enough space for "temp.a"

Can I achieve to assign
first token to temp.d,
second token to temp.e,
third to temp.f etc.

Is there a way to do this?

With your current structure this would be rather messy. At least you should use a string array for all your tokens.

I must to parse HTTP ....I thought that strtok() will solve all my problems, ...now I don't have idea ...

But if you want to parse HTTP requests/responses I would use strtok() just for splitting the lines and then use sscanf() to parse the status/request/header lines because they have a well defined format.

Bye, Andreas

[anya]

You're right. I misread your usage of strtok().

Assigning a token to a pointer is the same as assigning any other string to a pointer. You have char pointers in your structure so you could just do something like

temp.a = token;

or you could allocate memory for each pointer and then copy the token string to that memory location using strcpy():

strcpy(temp.a, token);  // assuming you have allocated enough space for "temp.a"

With your current structure this would be rather messy. At least you should use a string array for all your tokens.


But if you want to parse HTTP requests/responses I would use strtok() just for splitting the lines and then use sscanf() to parse the status/request/header lines because they have a well defined format.

Bye, Andreas

Thank you, I will try to achieve that

All the best,
Anya