Split String by Carriage Return C

Question

I am having a problem where I am trying to split an HTTP request by a carriage return for a web proxy. The request does not seem to split.

Here is an example request: GET /pub/WWW/TheProject.html HTTP/1.1\r\nHost: www.w3.org\r\n

My attempt is:

char* split_request;
split_request = strtok(request, "\r\n");

But it never gets split? I am not sure what I am missing. It seems to split when I am using wget or the browser to test the web proxy, but doesn't with telnet.

You seem to assume this is C's variant of `split` in other languages; it is not. `strtok` scans for *any* character in its argument string. — Jongware, Nov 24 '14 at 09:49

score 10 · Answer 1 · edited Nov 24 '14 at 12:43

10

Are you doing this way?

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

int main (void)
{
    char str[] = "GET /pub/WWW/TheProject.html HTTP/1.1\r\nHost: www.w3.org\r\n";
    char* pch = NULL;

    pch = strtok(str, "\r\n");

    while (pch != NULL)
    {
        printf("%s\n", pch);
        pch = strtok(NULL, "\r\n");
    }
    return 0;
}

Output:

GET /pub/WWW/TheProject.html HTTP/1.1   
Host: www.w3.org

edited Nov 24 '14 at 12:43

Jongware

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answered Nov 24 '14 at 05:31

Jagannath

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This is clearly not C. Tempted to downvote, except that your string handling is correct. – Jongware Nov 24 '14 at 09:51
2

I overlooked the header files iostream and cstring. Edited it now. – Jagannath Nov 24 '14 at 09:53

score 3 · Answer 2 · edited May 23 '17 at 12:08

3

Check the below link:

How does strtok() split the string into tokens in C?

int main()
{
    char request[20]="some\r\nstring";
    char* split_request;
    split_request = strtok(request,"\r\n");
    while(split_request != NULL)
    {
       printf("%s\n",split_request);
       split_request = strtok(NULL,"\r\n");

    }

    return 0;
}

edited May 23 '17 at 12:08

Community

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answered Nov 24 '14 at 05:34

Gopi

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Split String by Carriage Return C

2 Answers2