Description:
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These two functions, also in libuuid, would be useful.

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NAME
       uuid_parse - convert an input UUID string into binary representation

SYNOPSIS
       #include <uuid/uuid.h>

       int uuid_parse( char *in, uuid_t uu);

DESCRIPTION
       The  uuid_parse function converts the UUID string given by in into the binary representation.  The input
       UUID  is  a   string   of   the   form   1b4e28ba-2fa1-11d2-883f-b9a761bde3fb   (in   printf(3)   format
       "%08x-%04x-%04x-%04x-%012x", 36 bytes plus the trailing ?\0?).

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NAME
       uuid_unparse - convert an UUID from binary representation to a string

SYNOPSIS
       #include <uuid/uuid.h>

       void uuid_unparse(uuid_t uu, char *out);
       void uuid_unparse_upper(uuid_t uu, char *out);
       void uuid_unparse_lower(uuid_t uu, char *out);

DESCRIPTION
       The  uuid_unparse  function  converts the supplied UUID uu from the binary representation into a 36-byte
       string (plus tailing ?\0?) of the form 1b4e28ba-2fa1-11d2-883f-b9a76 and stores this value in the  char-
       acter  string  pointed  to  by out.  The case of the hex digits returned by uuid_unparse may be upper or
       lower case, and is dependent on the system-dependent local default.

       If the case of the hex digits is important then the functions uuid_unparse_upper and  uuid_unparse_lower
       may be used.