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Frostbyte's 1980s DOS Shareware Collection
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BTREE.ZIP
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BTDELETE.C
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1989-08-31
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90 lines
/* Copyright (c) 1989 Citadel */
/* All Rights Reserved */
/* #ident "btdelete.c 1.1 - 89/07/03" */
#include <blkio.h>
#include <errno.h>
#include "btree_.h"
/*man---------------------------------------------------------------------------
NAME
btdelete - delete btree key
SYNOPSIS
#include <btree.h>
int btdelete(btp, buf)
btree_t *btp;
void *buf;
DESCRIPTION
The btdelete function finds the key in btree btp with the value pointed
to by buf and deletes it. The cursor is positioned to the key following
the one deleted.
btdelete will fail if one or more of the following is true:
[EINVAL] btp is not a valid btree pointer.
[EINVAL] buf is the NULL pointer.
[BTELOCK] btp is not write locked.
[BTENKEY] The key pointed to by buf is not
in btp.
[BTENOPEN] btp is not open.
SEE ALSO
btdelcur, btinsert, btsearch.
DIAGNOSTICS
Upon successful completion, a value of 0 is returned. Otherwise, a
value of -1 is returned, and errno set to indicate the error.
------------------------------------------------------------------------------*/
int btdelete(btp, buf)
btree_t * btp;
void * buf;
{
int rs = 0;
errno = 0;
/* validate arguments */
if ((!bt_valid(btp)) || (buf == NULL)) {
errno = EINVAL;
return -1;
}
/* check if not open */
if (!(btp->flags & BTOPEN)) {
errno = BTENOPEN;
return -1;
}
/* check if not write locked */
if (!(btp->flags & BTWRLCK)) {
errno = BTELOCK;
return -1;
}
/* make buf the current key */
rs = btsearch(btp, buf);
if (rs == -1) {
BTEPRINT;
return -1;
}
if (rs == 0) { /* key not in btree btp */
errno = BTENKEY;
return -1;
}
/* delete the current key */
rs = btdelcur(btp);
if (rs == -1) {
BTEPRINT;
return -1;
}
errno = 0;
return 0;
}