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CBCREATE.C
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1993-01-01
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/*
* Copyright (c) 1989-1992 Citadel Software, Inc.
* All Rights Reserved
*/
/* #ident "@(#)cbcreate.c 1.7 - 93/01/01" */
#include <port.h>
/* standard headers */
#include <errno.h>
#ifdef AC_STDDEF
#include <stddef.h>
#endif
#include <stdio.h>
/* library headers */
#include <blkio.h>
#include <btree.h>
#include <lseq.h>
/* local headers */
#include "cbase_.h"
/* btree field definition list */
static btfield_t btfldv[] = {
{
0,
0,
NULL,
BT_FASC
},
{
0,
sizeof(cbrpos_t),
cbrposcmp,
BT_FASC
},
};
/*man---------------------------------------------------------------------------
NAME
cbcreate - create a cbase
SYNOPSIS
#include <cbase.h>
int cbcreate(cbname, recsize, fldc, fldv)
const char *cbname;
size_t recsize;
int fldc;
const cbfield_t fldv[];
DESCRIPTION
The cbcreate function creates a cbase. cbname points to a
character string that contains the name of the cbase to be
created. cbname is used as the name of the data file containing
the records in the cbase.
recsize specifies the size of the records in the cbase.
fldc is the field count. It specifies the number of fields in
the records stored in this cbase. fldv is an array of field
definition structures. fldv must have fldc elements. The field
definition structure is defined in <cbase.h> as type cbfield_t.
It has the following members.
size_t offset; /* offset of field in record *\/
size_t len; /* field length *\/
int type; /* field data type *\/
int flags; /* flags *\/
char *filename; /* name of key file *\/
offset and len specify the location and length of the field,
respectively. type is the data type for the field; see cbase
manual entry for a list of the predefined data types, and
the cbase Programmer's Guide for information on adding new data
types. filename is the name of the file to be used for key
storage. flags values are constructed by bitwise OR-ing flags
from the following list:
CB_FKEY Field is a key.
CB_FUNIQ Only for use with CB_FKEY. Indicates
that the keys must be unique.
The fields in the field definition list must be in order,
starting with the first field in the record.
cbcreate will fail if one or more of the following is true:
[EEXIST] Either the record file or one of
the key files exists.
[EINVAL] cbname is the NULL pointer.
[EINVAL] recsize is less than sizeof(cbrpos_t).
[EINVAL] fldc is less than 1.
[EINVAL] fldv is the NULL pointer.
[EINVAL] fldv contains an invalid field
definition.
SEE ALSO
cbopen.
DIAGNOSTICS
Upon successful completion, a value of 0 is returned. Otherwise,
a value of -1 is returned, and errno set to indicate the error.
------------------------------------------------------------------------------*/
#ifdef AC_PROTO
int cbcreate(const char *cbname, size_t recsize, int fldc, const cbfield_t fldv[])
#else
int cbcreate(cbname, recsize, fldc, fldv)
const char *cbname;
size_t recsize;
int fldc;
const cbfield_t fldv[];
#endif
{
int terrno = 0;
int i = 0;
/* validate arguments */
if (cbname == NULL || recsize < sizeof(cbrpos_t)) {
errno = EINVAL;
return -1;
}
if (!cb_fvalid(recsize, fldc, fldv)) {
errno = EINVAL;
return -1;
}
/* create data file */
if (lscreate(cbname, recsize) == -1) {
#ifdef DEBUG
if (errno != EEXIST) CBERRLOG;
#endif
return -1;
}
/* create key files */
for (i = 0; i < fldc; ++i) {
if (fldv[i].flags & CB_FKEY) {
btfldv[1].offset = btfldv[0].len = fldv[i].len;
btfldv[0].cmp = cbcmpv[fldv[i].type];
if (btcreate(fldv[i].filename, CBM, fldv[i].len + sizeof(cbrpos_t), 2, btfldv) == -1) {
#ifdef DEBUG
if (errno != EEXIST) CBERRLOG;
#endif
terrno = errno;
for (i--; i >= 0; i--) { /* remove files */
if (fldv[i].flags & CB_FKEY) {
remove(fldv[i].filename);
}
}
remove(cbname);
errno = terrno;
return -1;
}
}
}
return 0;
}