diff options
Diffstat (limited to 'db/recno/rec_get.c')
| -rw-r--r-- | db/recno/rec_get.c | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/db/recno/rec_get.c b/db/recno/rec_get.c new file mode 100644 index 0000000000..47dd773fb9 --- /dev/null +++ b/db/recno/rec_get.c @@ -0,0 +1,311 @@ +/*- + * 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.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); +} |