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Diffstat (limited to '1.2-netsec/db1-ast/hash/README')
| -rw-r--r-- | 1.2-netsec/db1-ast/hash/README | 72 |
1 files changed, 0 insertions, 72 deletions
diff --git a/1.2-netsec/db1-ast/hash/README b/1.2-netsec/db1-ast/hash/README deleted file mode 100644 index f29ccf7e1..000000000 --- a/1.2-netsec/db1-ast/hash/README +++ /dev/null @@ -1,72 +0,0 @@ -# @(#)README 8.1 (Berkeley) 6/4/93 - -This package implements a superset of the hsearch and dbm/ndbm libraries. - -Test Programs: - All test programs which need key/data pairs expect them entered - with key and data on separate lines - - tcreat3.c - Takes - bucketsize (bsize), - fill factor (ffactor), and - initial number of elements (nelem). - Creates a hash table named hashtest containing the - keys/data pairs entered from standard in. - thash4.c - Takes - bucketsize (bsize), - fill factor (ffactor), - initial number of elements (nelem) - bytes of cache (ncached), and - file from which to read data (fname) - Creates a table from the key/data pairs on standard in and - then does a read of each key/data in fname - tdel.c - Takes - bucketsize (bsize), and - fill factor (ffactor). - file from which to read data (fname) - Reads each key/data pair from fname and deletes the - key from the hash table hashtest - tseq.c - Reads the key/data pairs in the file hashtest and writes them - to standard out. - tread2.c - Takes - butes of cache (ncached). - Reads key/data pairs from standard in and looks them up - in the file hashtest. - tverify.c - Reads key/data pairs from standard in, looks them up - in the file hashtest, and verifies that the data is - correct. - -NOTES: - -The file search.h is provided for using the hsearch compatible interface -on BSD systems. On System V derived systems, search.h should appear in -/usr/include. - -The man page ../man/db.3 explains the interface to the hashing system. -The file hash.ps is a postscript copy of a paper explaining -the history, implementation, and performance of the hash package. - -"bugs" or idiosyncracies - -If you have a lot of overflows, it is possible to run out of overflow -pages. Currently, this will cause a message to be printed on stderr. -Eventually, this will be indicated by a return error code. - -If you are using the ndbm interface and exit without flushing or closing the -file, you may lose updates since the package buffers all writes. Also, -the db interface only creates a single database file. To avoid overwriting -the user's original file, the suffix ".db" is appended to the file name -passed to dbm_open. Additionally, if your code "knows" about the historic -.dir and .pag files, it will break. - -There is a fundamental difference between this package and the old hsearch. -Hsearch requires the user to maintain the keys and data in the application's -allocated memory while hash takes care of all storage management. The down -side is that the byte strings passed in the ENTRY structure must be null -terminated (both the keys and the data). |