94 lines
3.1 KiB
Scheme
94 lines
3.1 KiB
Scheme
;;; Very vanilla DBM processing code
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;;; Copyright (c) 1995 by David Albertz (dalbertz@clark.lcs.mit.edu).
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;;; This code is freely available for use by anyone for any purpose,
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;;; so long as you don't charge money for it, remove this notice, or
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;;; hold us liable for any results of its use. --enjoy.
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;;; This is just a straight translation of the UNIX freebie NDBM code.
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;;; Usage: (db-open name flags mode type info)
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;;; name := name of database file (no extension)
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;;; flags := file access flags (open/create etc.)
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;;; mode := file access modes (privileges)
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;;; type := DBTYPE as defined in db.h (btree, hash, recno)
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;;; info := access method specific structure
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;;; (NULL gives defaults)
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;;; Return: Alien value pointer to the open DBM structure
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;;; Usage: (dbm-close db)
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;;; db := The pointer returned by dbm-open
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;;; Return: Always returns 0
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;;; Usage: (dbm-fetch db key)
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;;; db := The pointer returned by dbm-open
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;;; key := The key value of data to be retrieved
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;;; Return: String containing data associated with key
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;;; Usage: (dbm-store db key data flag)
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;;; db := The pointer returned by dbm-open
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;;; key := The key value to be associated with data
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;;; data := The data to be stored with the key
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;;; flag := 0 for insert, 1 for replace
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;;; Return: Integer returned by UNIX dbm_store routine
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;;; Usage: (dbm-delete db key)
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;;; db := The pointer returned by dbm-open
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;;; key := The key value of data to be deleted
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;;; Return: Integer returned by UNIX dbm_delete routine
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;;; Usage: (dbm-firstkey db)
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;;; db := The pointer returned by dbm-open
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;;; Return: First key value stored in database hash table.
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;;; Usage: (dbm-nextkey db)
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;;; db := The pointer returned by dbm-open
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;;; Return: Next key value stored in database hash table.
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;;; Usage: (dbm-error db)
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;;; db := The pointer returned by dbm-open
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;;; Return: Error number returned by UNIX dbm_error routine
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;;; Usage: (dbm-clearerr db)
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;;; db := The pointer returned by dbm-open
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;;; Return: Clears any database error condition and returns the
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;;; integer from the UNIX dbm_clearerr routine
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;;; ***NOTE: All key and data elements must be strings
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;;; Scheme48 implementation.
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(foreign-source
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"#include <sys/types.h>"
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"#include <limits.h>"
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"#include \"/usr/local/include/db.h\""
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""
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"extern int errno;"
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""
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"#define errno_or_false(x) (((x) == -1) ? ENTER_FIXNUM(errno) : SCHFALSE)"
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"" "")
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(define-foreign %db-open (db_open (string file)
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(integer flags)
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(integer mode)
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(integer type))
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(to-scheme integer errno_or_false) ; error flag
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(C DB**)) ; DBM structure
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(define (db-open file flags mode type)
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(receive (err dbm) (%db-open file flags mode type)
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(if err
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(errno-error err db-open)
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dbm)))
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