How would you parse an IP address from a string of characters in C?

Question

I have a variable that holds these sets of characters:

char recvBuff[1024] = "OK lastname,firstname 127.0.0.1";

I'm trying to parse the 127.0.0.1 IP address from that entire string and assign it to another variable. How can I parse this IP address from the string? (I don't need 127, 0, 0, and 1 separate. I need "127.0.0.1" as a whole string.

possible duplicate of [parsing ip adress string in 4 single bytes](http://stackoverflow.com/questions/9211601/parsing-ip-adress-string-in-4-single-bytes) — sashoalm, Apr 08 '15 at 06:37
@sashoalm these are two different questions. I need the entire IP address. Not the 4 bytes individually. Thank you though — user2921302, Apr 08 '15 at 07:26

score 1 · Accepted Answer · answered Apr 08 '15 at 06:38

1

You can use strtok() or strtok_r() function to separate the string.

      char *strtok(char *str, const char *delim);

      char *strtok_r(char *str, const char *delim, char **saveptr);

Before separating the string You can take the backup of the string because it will affect the original string.

answered Apr 08 '15 at 06:38

sharon

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perfect, thank you. i had to create a token `char *token` then type the same line three times to get to the IP address `token = strtok(recvBuff, " ");` (at this point the token is at the OK characters, then `token = strtok(NULL, " ");` (the token is now the lastname,firstname) and finally do the same thing one more time to make the token equal to the IP address. Is there a way to simplify this? – user2921302 Apr 08 '15 at 07:23
Are you using `"OK lastname,firstname 127.0.0.1"` string only or you will have some other strings and at last `address`? – sharon Apr 08 '15 at 07:28

How would you parse an IP address from a string of characters in C?

1 Answers1