K&R style declaration

[westymatt]

void
capture_callback(buffer, packet_header, data)
u_char *buffer, const struct pcap_pkthdr *packet_header,
u_char *data;
{
.....
}

devbox:~/projects/packet_capture$ gcc -c packman.c
packman.c: In function âcapture_callbackâ:
packman.c:66: error: expected identifier or â(â before âconstâ
packman.c:76: error: invalid type argument of â->â

I am not sure how to form this declaration. I know I don't have to
use k&r, but I would just like to know.

 

[Tim Prince]

void
capture_callback(buffer, packet_header, data)
u_char *buffer, const struct pcap_pkthdr *packet_header,
u_char *data;
{
.....
}

devbox:~/projects/packet_capture$ gcc -c packman.c
packman.c: In function âcapture_callbackâ:
packman.c:66: error: expected identifier or â(â before âconstâ
packman.c:76: error: invalid type argument of â->â

I am not sure how to form this declaration. I know I don't have to
use k&r, but I would just like to know.

K&R didn't support const, so it would have to be omitted. Only recently
has gcc begun to get strict about combining K&R code where const is
unspecified with std C where it is specified, breaking the builds where
warnings are treated as fatal.
BTW, the strange characters are likely due to your not setting an
environment variable such as LANG=C.

 

[westymatt]

thank you very much for your help

 

[Ben Pfaff]

....
K&R didn't support const, so it would have to be omitted.

I think that the real problem here is that the commas in the list
of declarations should be semicolons. ISO C does not forbid use
of const in K&R-style function parameter declarations.

 

[westymatt]

Thank you very much worked perfectly.