Go4Expert - QUESTION: C string manipulation.

Go4Expert (http://www.go4expert.com/)

- C (http://www.go4expert.com/forumdisplay.php?f=20)

- - QUESTION: C string manipulation. (http://www.go4expert.com/showthread.php?t=14630)

wgre0111

20Oct2008 03:32

QUESTION: C string manipulation.

Greetings,

I am making an update to a ESQLC program that is using topend to communicate with Windows..

I have been having a problem separating a string.

I have column on a table that holds the address of a printer in the following format. 111.111.111.111:4000
Its not always guaranteed to be that length.

I pull that list back via FETCh into.... but NOW i want to split it into two different variables. One with the IP and the other with the Port.
so char oIPnPort[] = "111.123.123.123:5000";
would be split up and copied into two separate variables

char oIP[] = "111.1223.123.123";
char oPort[] = "5000";

Could someone give me an example of how to do this via C???

Use of pointers or anything else would be ok... just need help...

This split would remove the : between the port and IP as well... I know I want to copy whats to the right of the : in one variable"port" and whats to the left of the : in IP.

THANKS!

oogabooga

20Oct2008 07:03

Re: QUESTION: C string manipulation.

Low-level:

Code:

void split_addr (char *ip_port, char *ip, char *port)

{

    while (*ip_port && *ip_port != ':')

        *ip++ = *ip_port++;

    *ip = 0;



    if (*ip_port++) // if not pointing at null char

        while (*ip_port)

            *port++ = *ip_port++;

    *port = 0;

}

Using the library function strtok():

Code:

#include <string.h>



void split_addr (char *ip_port, char *ip, char *port)

{

    char *p;

    p = strtok (ip_port, ":");

    strcpy (ip, p);

    p = strtok (NULL, "");

    if (p) strcpy (port, p);

    else   *port = 0;

}

Call either like this:

Code:

char oIPnPort[] = "111.123.123.123:5000";

char oIP[30];

char oPort[10];

split_addr (oIPnPort, oIP, oPort);

All times are GMT +5.5. The time now is 07:29.