dfindnk - find next record with same key
rno_t dfindnk (buffer, fcb)
Dfindnk finds the next occurrence of a keyed record in an opened
RMSfile. dfindk(C-3) must be called to find the first occurrence
of a keyed record. After that call, multiple calls to dfindnk may
be made to retrieve successive occurrences of a keyed record. The
beginning contents of buffer are ignored by dfindnk.
Fcb is the file block pointer returned by dlopen(C-3) or
The returned record number may be saved and used on a subsequent
call to dread(C-3). The record found is returned in buffer.
dlopen(C-3), dopen(C-3), dread(C-3), dfindk(C-3), dfindpk(C-3)
Chapter 4, RMS Programming Guide
Dfindnk returns a value of BAD (-1) if the record is not found or
if an I/O error occurred. If the record is not found then the
contents of buffer are undefined.