The Prefix a String routine inserts a source string at the
    beginning of a destination string. The destination string must
    be dynamic or varying length.

    Format

      STR$PREFIX  destination-string ,source-string

1 - Returns

    OpenVMS usage:cond_value
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

2 - Arguments

 destination-string

    OpenVMS usage:char_string
    type:         character string
    access:       write only
    mechanism:    by descriptor

    Destination string (dynamic or varying length). STR$PREFIX copies
    the source string into the beginning of this destination string.
    The destination-string argument is the address of a descriptor
    pointing to the destination string.

 source-string

    OpenVMS usage:char_string
    type:         character string
    access:       read only
    mechanism:    by descriptor

    Source string that STR$PREFIX copies into the beginning of the
    destination string. The source-string argument is the address of
    a descriptor pointing to the source string.