text: #pragma ident	"%Z%%M%	%I%	%E% SMI"
  
  /*-
   * Copyright (c) 1990, 1993, 1994
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #if defined(LIBC_SCCS) && !defined(lint)
  static char sccsid[] = "@(#)rec_get.c	8.9 (Berkeley) 8/18/94";
  #endif /* LIBC_SCCS and not lint */
  
  #include <sys/types.h>
  
  #include <errno.h>
  #include <stddef.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  
  #include "db-int.h"
  #include "recno.h"
  
  /*
   * __REC_GET -- Get a record from the btree.
   *
   * Parameters:
   *	dbp:	pointer to access method
   *	key:	key to find
   *	data:	data to return
   *	flag:	currently unused
   *
   * Returns:
   *	RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
   */
  int
  __rec_get(dbp, key, data, flags)
  	const DB *dbp;
  	const DBT *key;
  	DBT *data;
  	u_int flags;
  {
  	BTREE *t;
  	EPG *e;
  	recno_t nrec;
  	int status;
  
  	t = dbp->internal;
  
  	/* Toss any page pinned across calls. */
  	if (t->bt_pinned != NULL) {
  		mpool_put(t->bt_mp, t->bt_pinned, 0);
  		t->bt_pinned = NULL;
  	}
  
  	/* Get currently doesn't take any flags, and keys of 0 are illegal. */
  	if (flags || (nrec = *(recno_t *)key->data) == 0) {
  		errno = EINVAL;
  		return (RET_ERROR);
  	}
  
  	/*
  	 * If we haven't seen this record yet, try to find it in the
  	 * original file.
  	 */
  	if (nrec > t->bt_nrecs) {
  		if (F_ISSET(t, R_EOF | R_INMEM))
  			return (RET_SPECIAL);
  		if ((status = t->bt_irec(t, nrec)) != RET_SUCCESS)
  			return (status);
  	}
  
  	--nrec;
  	if ((e = __rec_search(t, nrec, SEARCH)) == NULL)
  		return (RET_ERROR);
  
  	status = __rec_ret(t, e, 0, NULL, data);
  	if (F_ISSET(t, B_DB_LOCK))
  		mpool_put(t->bt_mp, e->page, 0);
  	else
  		t->bt_pinned = e->page;
  	return (status);
  }
  
  /*
   * __REC_FPIPE -- Get fixed length records from a pipe.
   *
   * Parameters:
   *	t:	tree
   *	cnt:	records to read
   *
   * Returns:
   *	RET_ERROR, RET_SUCCESS
   */
  int
  __rec_fpipe(t, top)
  	BTREE *t;
  	recno_t top;
  {
  	DBT data;
  	recno_t nrec;
  	size_t len;
  	int ch;
  	u_char *p;
  
  	if (t->bt_rdata.size < t->bt_reclen) {
  		t->bt_rdata.data = t->bt_rdata.data == NULL ?
  		    malloc(t->bt_reclen) :
  		    realloc(t->bt_rdata.data, t->bt_reclen);
  		if (t->bt_rdata.data == NULL)
  			return (RET_ERROR);
  		t->bt_rdata.size = t->bt_reclen;
  	}
  	data.data = t->bt_rdata.data;
  	data.size = t->bt_reclen;
  
  	for (nrec = t->bt_nrecs; nrec < top;) {
  		len = t->bt_reclen;
  		for (p = t->bt_rdata.data;; *p++ = ch)
  			if ((ch = getc(t->bt_rfp)) == EOF || !--len) {
  				if (ch != EOF)
  					*p = ch;
  				if (len != 0)
  					memset(p, t->bt_bval, len);
  				if (__rec_iput(t,
  				    nrec, &data, 0) != RET_SUCCESS)
  					return (RET_ERROR);
  				++nrec;
  				break;
  			}
  		if (ch == EOF)
  			break;
  	}
  	if (nrec < top) {
  		F_SET(t, R_EOF);
  		return (RET_SPECIAL);
  	}
  	return (RET_SUCCESS);
  }
  
  /*
   * __REC_VPIPE -- Get variable length records from a pipe.
   *
   * Parameters:
   *	t:	tree
   *	cnt:	records to read
   *
   * Returns:
   *	RET_ERROR, RET_SUCCESS
   */
  int
  __rec_vpipe(t, top)
  	BTREE *t;
  	recno_t top;
  {
  	DBT data;
  	recno_t nrec;
  	indx_t len;
  	size_t sz;
  	int bval, ch;
  	u_char *p;
  
  	bval = t->bt_bval;
  	for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
  		for (p = t->bt_rdata.data,
  		    sz = t->bt_rdata.size;; *p++ = ch, --sz) {
  			if ((ch = getc(t->bt_rfp)) == EOF || ch == bval) {
  				data.data = t->bt_rdata.data;
  				data.size = p - (u_char *)t->bt_rdata.data;
  				if (ch == EOF && data.size == 0)
  					break;
  				if (__rec_iput(t, nrec, &data, 0)
  				    != RET_SUCCESS)
  					return (RET_ERROR);
  				break;
  			}
  			if (sz == 0) {
  				len = p - (u_char *)t->bt_rdata.data;
  				t->bt_rdata.size += (sz = 256);
  				t->bt_rdata.data = t->bt_rdata.data == NULL ?
  				    malloc(t->bt_rdata.size) :
  				    realloc(t->bt_rdata.data, t->bt_rdata.size);
  				if (t->bt_rdata.data == NULL)
  					return (RET_ERROR);
  				p = (u_char *)t->bt_rdata.data + len;
  			}
  		}
  		if (ch == EOF)
  			break;
  	}
  	if (nrec < top) {
  		F_SET(t, R_EOF);
  		return (RET_SPECIAL);
  	}
  	return (RET_SUCCESS);
  }
  
  /*
   * __REC_FMAP -- Get fixed length records from a file.
   *
   * Parameters:
   *	t:	tree
   *	cnt:	records to read
   *
   * Returns:
   *	RET_ERROR, RET_SUCCESS
   */
  int
  __rec_fmap(t, top)
  	BTREE *t;
  	recno_t top;
  {
  	DBT data;
  	recno_t nrec;
  	u_char *sp, *ep, *p;
  	size_t len;
  
  	if (t->bt_rdata.size < t->bt_reclen) {
  		t->bt_rdata.data = t->bt_rdata.data == NULL ?
  		    malloc(t->bt_reclen) :
  		    realloc(t->bt_rdata.data, t->bt_reclen);
  		if (t->bt_rdata.data == NULL)
  			return (RET_ERROR);
  		t->bt_rdata.size = t->bt_reclen;
  	}
  	data.data = t->bt_rdata.data;
  	data.size = t->bt_reclen;
  
  	sp = (u_char *)t->bt_cmap;
  	ep = (u_char *)t->bt_emap;
  	for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
  		if (sp >= ep) {
  			F_SET(t, R_EOF);
  			return (RET_SPECIAL);
  		}
  		len = t->bt_reclen;
  		for (p = t->bt_rdata.data;
  		    sp < ep && len > 0; *p++ = *sp++, --len);
  		if (len != 0)
  			memset(p, t->bt_bval, len);
  		if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
  			return (RET_ERROR);
  	}
  	t->bt_cmap = (caddr_t)sp;
  	return (RET_SUCCESS);
  }
  
  /*
   * __REC_VMAP -- Get variable length records from a file.
   *
   * Parameters:
   *	t:	tree
   *	cnt:	records to read
   *
   * Returns:
   *	RET_ERROR, RET_SUCCESS
   */
  int
  __rec_vmap(t, top)
  	BTREE *t;
  	recno_t top;
  {
  	DBT data;
  	u_char *sp, *ep;
  	recno_t nrec;
  	int bval;
  
  	sp = (u_char *)t->bt_cmap;
  	ep = (u_char *)t->bt_emap;
  	bval = t->bt_bval;
  
  	for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
  		if (sp >= ep) {
  			F_SET(t, R_EOF);
  			return (RET_SPECIAL);
  		}
  		for (data.data = sp; sp < ep && *sp != bval; ++sp);
  		data.size = sp - (u_char *)data.data;
  		if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
  			return (RET_ERROR);
  		++sp;
  	}
  	t->bt_cmap = (caddr_t)sp;
  	return (RET_SUCCESS);
  }
  