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-rw-r--r--main/db1-ast/recno/rec_get.c311
1 files changed, 311 insertions, 0 deletions
diff --git a/main/db1-ast/recno/rec_get.c b/main/db1-ast/recno/rec_get.c
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+++ b/main/db1-ast/recno/rec_get.c
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+/*-
+ * 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 "../include/db.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);
+}
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