buffer_get_token_pred - read token from buffer

       buffer_get_token_pred  copies  data from b to x[0], x[1], ..., x[len-1] until len bytes have been read or
       predicate called on the destination string returns nonzero.

       predicate can also return 0 (indicating further input is required to complete the token) or -1 (abort and
       return -1; use this if predicate wants to enfore a maximum message  size  or  does  timeout  handling  or
       detects a malformed message).

       buffer_get_token_pred returns the number of bytes copied or -1 on error (setting errno appropriately).

       buffer_get_token_pred - read token from buffer

buffer_init(3), buffer_feed(3), buffer_peek(3), buffer_seek(3), buffer(3)

                                                                                        buffer_get_token_pred(3)

#include<libowfat/buffer.h>

       ssize_t buffer_get_token_pred(buffer* b,char* x,size_t len,
                        int (*predicate)(const char* s,size_t len));