2 * Copyright (c) 1990, 1993, 1994
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30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)rec_get.c 8.9 (Berkeley) 8/18/94";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/types.h>
49 * __REC_GET -- Get a record from the btree.
52 * dbp: pointer to access method
54 * data: data to return
55 * flag: currently unused
58 * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
61 __rec_get(const DB *dbp, const DBT *key, DBT *data, u_int flags)
70 /* Toss any page pinned across calls. */
71 if (t->bt_pinned != NULL) {
72 mpool_put(t->bt_mp, t->bt_pinned, 0);
76 /* Get currently doesn't take any flags, and keys of 0 are illegal. */
77 if (flags || (nrec = *(recno_t *)key->data) == 0) {
83 * If we haven't seen this record yet, try to find it in the
86 if (nrec > t->bt_nrecs) {
87 if (F_ISSET(t, R_EOF | R_INMEM))
89 if ((status = t->bt_irec(t, nrec)) != RET_SUCCESS)
94 if ((e = __rec_search(t, nrec, SEARCH)) == NULL)
97 status = __rec_ret(t, e, 0, NULL, data);
98 if (F_ISSET(t, B_DB_LOCK))
99 mpool_put(t->bt_mp, e->page, 0);
101 t->bt_pinned = e->page;
106 * __REC_FPIPE -- Get fixed length records from a pipe.
110 * cnt: records to read
113 * RET_ERROR, RET_SUCCESS
116 __rec_fpipe(BTREE *t, recno_t top)
124 if (t->bt_rdata.size < t->bt_reclen) {
125 t->bt_rdata.data = reallocf(t->bt_rdata.data, t->bt_reclen);
126 if (t->bt_rdata.data == NULL)
128 t->bt_rdata.size = t->bt_reclen;
130 data.data = t->bt_rdata.data;
131 data.size = t->bt_reclen;
133 for (nrec = t->bt_nrecs; nrec < top;) {
135 for (p = t->bt_rdata.data;; *p++ = ch)
136 if ((ch = getc(t->bt_rfp)) == EOF || !--len) {
140 memset(p, t->bt_bval, len);
142 nrec, &data, 0) != RET_SUCCESS)
152 return (RET_SPECIAL);
154 return (RET_SUCCESS);
158 * __REC_VPIPE -- Get variable length records from a pipe.
162 * cnt: records to read
165 * RET_ERROR, RET_SUCCESS
168 __rec_vpipe(BTREE *t, recno_t top)
178 for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
179 for (p = t->bt_rdata.data,
180 sz = t->bt_rdata.size;; *p++ = ch, --sz) {
181 if ((ch = getc(t->bt_rfp)) == EOF || ch == bval) {
182 data.data = t->bt_rdata.data;
183 data.size = p - (u_char *)t->bt_rdata.data;
184 if (ch == EOF && data.size == 0)
186 if (__rec_iput(t, nrec, &data, 0)
192 len = p - (u_char *)t->bt_rdata.data;
193 t->bt_rdata.size += (sz = 256);
194 t->bt_rdata.data = reallocf(t->bt_rdata.data, t->bt_rdata.size);
195 if (t->bt_rdata.data == NULL)
197 p = (u_char *)t->bt_rdata.data + len;
205 return (RET_SPECIAL);
207 return (RET_SUCCESS);
211 * __REC_FMAP -- Get fixed length records from a file.
215 * cnt: records to read
218 * RET_ERROR, RET_SUCCESS
221 __rec_fmap(BTREE *t, recno_t top)
228 if (t->bt_rdata.size < t->bt_reclen) {
229 t->bt_rdata.data = reallocf(t->bt_rdata.data, t->bt_reclen);
230 if (t->bt_rdata.data == NULL)
232 t->bt_rdata.size = t->bt_reclen;
234 data.data = t->bt_rdata.data;
235 data.size = t->bt_reclen;
237 sp = (u_char *)t->bt_cmap;
238 ep = (u_char *)t->bt_emap;
239 for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
242 return (RET_SPECIAL);
245 for (p = t->bt_rdata.data;
246 sp < ep && len > 0; *p++ = *sp++, --len);
248 memset(p, t->bt_bval, len);
249 if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
252 t->bt_cmap = (caddr_t)sp;
253 return (RET_SUCCESS);
257 * __REC_VMAP -- Get variable length records from a file.
261 * cnt: records to read
264 * RET_ERROR, RET_SUCCESS
267 __rec_vmap(BTREE *t, recno_t top)
274 sp = (u_char *)t->bt_cmap;
275 ep = (u_char *)t->bt_emap;
278 for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
281 return (RET_SPECIAL);
283 for (data.data = sp; sp < ep && *sp != bval; ++sp);
284 data.size = sp - (u_char *)data.data;
285 if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
289 t->bt_cmap = (caddr_t)sp;
290 return (RET_SUCCESS);