95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
/* Scheme48/scsh Unix system interface.
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** Routines that require custom C support.
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** Copyright (c) 1995 by David Albertz.
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*/
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/* Common dbm access routines */
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#include <errno.h>
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#include <stdio.h>
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#include <errno.h>
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#include <ndbm.h>
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#include "cstuff.h"
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int database_delete(DBM *db, scheme_value key)
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{
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datum work_key;
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work_key.dptr = ADDRESS_AFTER_HEADER(key, char);
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work_key.dsize = STRING_LENGTH(key);
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return(dbm_delete(db, work_key));
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}
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char *database_fetch(DBM *db, scheme_value key)
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{
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datum work_key, work_data;
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char *work_string;
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work_key.dptr = ADDRESS_AFTER_HEADER(key, char);
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work_key.dsize = STRING_LENGTH(key);
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work_data = dbm_fetch(db, work_key);
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if (work_data.dptr == NULL)
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{
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work_string = Malloc(char, 1);
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work_string[0] = '\0';
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}
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else
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{
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work_string = Malloc(char, work_data.dsize+1);
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memcpy(work_string,work_data.dptr,work_data.dsize);
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work_string[work_data.dsize] = '\0';
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}
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return(work_string);
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}
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int database_store(DBM *db, scheme_value key, scheme_value data, int flags)
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{
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datum work_key, work_data;
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work_key.dptr = ADDRESS_AFTER_HEADER(key, char);
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work_key.dsize = STRING_LENGTH(key);
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work_data.dptr = ADDRESS_AFTER_HEADER(data, char);
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work_data.dsize = STRING_LENGTH(data);
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return(dbm_store(db, work_key, work_data, flags));
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}
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char *database_first(DBM *db)
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{
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datum work_key;
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char *work_string;
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work_key = dbm_firstkey(db);
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if (work_key.dptr == NULL)
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{
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work_string = Malloc(char, 1);
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work_string[0] = '\0';
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}
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else
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{
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work_string = Malloc(char, work_key.dsize+1);
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memcpy(work_string,work_key.dptr,work_key.dsize);
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work_string[work_key.dsize] = '\0';
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}
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return(work_string);
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}
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char *database_next(DBM *db)
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{
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datum work_key;
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char *work_string;
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work_key = dbm_nextkey(db);
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if (work_key.dptr == NULL)
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{
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work_string = Malloc(char, 1);
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work_string[0] = '\0';
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}
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else
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{
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work_string = Malloc(char, work_key.dsize+1);
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memcpy(work_string,work_key.dptr,work_key.dsize);
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work_string[work_key.dsize] = '\0';
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}
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return(work_string);
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}
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