convert an string within a struct

Here's the struct:
typedef struct __dun_request
{
char to_dun_msgid[12];
char to_dun_rc[2];
char to_dun_send_len[4];
char to_dun_rec_len[4];
char to_dun_filler[12];
char to_dun_userdata[6000];
} dun_request_def;

I pass to_dun_send_length = "0034".

atoi(dun_from_buf.fr_dun_rec_len) returns 12320

any ideas why?

>char to_dun_send_len[4];
is 4 bytes long,
>"0034"
is 5 bytes long. 4 you can see, the last is the null terminator. The code is therefore bugged, as you can't use the array as a string.

And I trust you used strcpy() (or similar) to populate the array, as opposed to a straight assign like you showed?