Extract POST parameters from C String

Question

I have the following C String:

char teste[] = "POST /index.html HTTP/1.1\nHost: localhost:8000\nConnection: keep-alive\nContent-Length: 23\nCache-Control: max-age=0\nAccept: text/html,application/xhtml+x
ml,application/xml;q=0.9,*/*;q=0.8\n Origin: http://localhost:8000\nUser-Agent: Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.65 Safari/
537.36\nContent-Type: application/x-www-form-urlencoded\nReferer: http://localhost:8000/index.html\nAccept-Encoding: gzip,deflate,sdch\nAccept-Language: pt-BR,pt;q=0.8,en-US;q=
0.6,en;q=0.4\n\nnome=thiago&idade=12313";

And i need to extract the POST parameters, which happens after the '\n\n':

\n\nnome=thiago&idade=12313";

The strtok seems to get stuck on the first '\n', so i think there's a better way of doing this. My code so far:

char *token = malloc(100);
char **value  = malloc(100 * sizeof(char *));
char **key  = malloc(100 * sizeof(char *));
int i;

for(i = 0; i < 100; i++)
{
   value[i] = malloc(100);
   key[i] = malloc(100);
}

/* This doesn't work */ 
token = strtok(teste, "\n\n");

Any ideas on how to solve this? Thanks!

Martin R · Accepted Answer · 2013-09-04 20:44:18Z

1

You can use strstr() to locate the start of the parameters:

char *params = strstr(teste, "\n\n");
if (params != NULL) {
    params += 2; // now points to first key
    // ...
}

and then use strtok() to separate the key-value pairs in params.

Remark: strtok_r() is a reentrant version of strtok(), and (at least on OS X), strtok() is obsoleted by strsep().

answered Sep 4, 2013 at 20:44

Martin R

541k98 gold badges1.3k silver badges1.4k bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Extract POST parameters from C String

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related