2 * SPDX-License-Identifier: BSD-3-Clause
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32 #if defined(LIBC_SCCS) && !defined(lint)
33 static char sccsid[] = "@(#)rec_get.c 8.9 (Berkeley) 8/18/94";
34 #endif /* LIBC_SCCS and not lint */
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include <sys/types.h>
51 * __REC_GET -- Get a record from the btree.
54 * dbp: pointer to access method
56 * data: data to return
57 * flag: currently unused
60 * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
63 __rec_get(const DB *dbp, const DBT *key, DBT *data, u_int flags)
72 /* Toss any page pinned across calls. */
73 if (t->bt_pinned != NULL) {
74 mpool_put(t->bt_mp, t->bt_pinned, 0);
78 /* Get currently doesn't take any flags, and keys of 0 are illegal. */
79 if (flags || (nrec = *(recno_t *)key->data) == 0) {
85 * If we haven't seen this record yet, try to find it in the
88 if (nrec > t->bt_nrecs) {
89 if (F_ISSET(t, R_EOF | R_INMEM))
91 if ((status = t->bt_irec(t, nrec)) != RET_SUCCESS)
96 if ((e = __rec_search(t, nrec, SEARCH)) == NULL)
99 status = __rec_ret(t, e, 0, NULL, data);
100 if (F_ISSET(t, B_DB_LOCK))
101 mpool_put(t->bt_mp, e->page, 0);
103 t->bt_pinned = e->page;
108 * __REC_FPIPE -- Get fixed length records from a pipe.
112 * cnt: records to read
115 * RET_ERROR, RET_SUCCESS
118 __rec_fpipe(BTREE *t, recno_t top)
126 if (t->bt_rdata.size < t->bt_reclen) {
127 t->bt_rdata.data = reallocf(t->bt_rdata.data, t->bt_reclen);
128 if (t->bt_rdata.data == NULL)
130 t->bt_rdata.size = t->bt_reclen;
132 data.data = t->bt_rdata.data;
133 data.size = t->bt_reclen;
135 for (nrec = t->bt_nrecs; nrec < top;) {
137 for (p = t->bt_rdata.data;; *p++ = ch)
138 if ((ch = getc(t->bt_rfp)) == EOF || !--len) {
142 memset(p, t->bt_bval, len);
144 nrec, &data, 0) != RET_SUCCESS)
154 return (RET_SPECIAL);
156 return (RET_SUCCESS);
160 * __REC_VPIPE -- Get variable length records from a pipe.
164 * cnt: records to read
167 * RET_ERROR, RET_SUCCESS
170 __rec_vpipe(BTREE *t, recno_t top)
180 for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
181 for (p = t->bt_rdata.data,
182 sz = t->bt_rdata.size;; *p++ = ch, --sz) {
183 if ((ch = getc(t->bt_rfp)) == EOF || ch == bval) {
184 data.data = t->bt_rdata.data;
185 data.size = p - (u_char *)t->bt_rdata.data;
186 if (ch == EOF && data.size == 0)
188 if (__rec_iput(t, nrec, &data, 0)
194 len = p - (u_char *)t->bt_rdata.data;
195 t->bt_rdata.size += (sz = 256);
196 t->bt_rdata.data = reallocf(t->bt_rdata.data, t->bt_rdata.size);
197 if (t->bt_rdata.data == NULL)
199 p = (u_char *)t->bt_rdata.data + len;
207 return (RET_SPECIAL);
209 return (RET_SUCCESS);
213 * __REC_FMAP -- Get fixed length records from a file.
217 * cnt: records to read
220 * RET_ERROR, RET_SUCCESS
223 __rec_fmap(BTREE *t, recno_t top)
230 if (t->bt_rdata.size < t->bt_reclen) {
231 t->bt_rdata.data = reallocf(t->bt_rdata.data, t->bt_reclen);
232 if (t->bt_rdata.data == NULL)
234 t->bt_rdata.size = t->bt_reclen;
236 data.data = t->bt_rdata.data;
237 data.size = t->bt_reclen;
239 sp = (u_char *)t->bt_cmap;
240 ep = (u_char *)t->bt_emap;
241 for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
244 return (RET_SPECIAL);
247 for (p = t->bt_rdata.data;
248 sp < ep && len > 0; *p++ = *sp++, --len);
250 memset(p, t->bt_bval, len);
251 if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
254 t->bt_cmap = (caddr_t)sp;
255 return (RET_SUCCESS);
259 * __REC_VMAP -- Get variable length records from a file.
263 * cnt: records to read
266 * RET_ERROR, RET_SUCCESS
269 __rec_vmap(BTREE *t, recno_t top)
276 sp = (u_char *)t->bt_cmap;
277 ep = (u_char *)t->bt_emap;
280 for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
283 return (RET_SPECIAL);
285 for (data.data = sp; sp < ep && *sp != bval; ++sp);
286 data.size = sp - (u_char *)data.data;
287 if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
291 t->bt_cmap = (caddr_t)sp;
292 return (RET_SUCCESS);