scan_hexdump - decode hexdump data

       scan_hexdump  decodes hexdump data from src into dest.  It will stop when it encounters any invalid input
       characters.  It will then write the number of decoded bytes in dest into *destlen, and return the  number
       of bytes decoded from src.

       Note  that  real world hexdump data is sometimes permitted to contain whitespace characters or new lines.
       This function will not allow those and return the decoded data until then.

       dest can be NULL. destlen can be NULL. dest can be src.

       scan_hexdump("302e",buf,&i) -> return 4, i=2, buf="0."

       scan_hexdump - decode hexdump data

       scan_hexdump returns the number of bytes successfully scanned and processed from src.

scan_xlong(3), scan_8long(3), fmt_ulong(3)

                                                                                                 scan_hexdump(3)

#include<libowfat/textcode.h>

       size_t scan_hexdump(const char *src,char *dest,size_t* destlen);