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29 * @(#)rec_get.c 8.9 (Berkeley) 8/18/94
30 * $FreeBSD: src/lib/libc/db/recno/rec_get.c,v 1.2.6.2 2001/01/02 09:11:10 obrien Exp $
31 * $DragonFly: src/lib/libc/db/recno/rec_get.c,v 1.4 2005/11/12 23:01:55 swildner Exp $
34 #include <sys/types.h>
47 * __REC_GET -- Get a record from the btree.
50 * dbp: pointer to access method
52 * data: data to return
53 * flag: currently unused
56 * RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
59 __rec_get(const DB *dbp, const DBT *key, DBT *data, u_int flags)
68 /* Toss any page pinned across calls. */
69 if (t->bt_pinned != NULL) {
70 mpool_put(t->bt_mp, t->bt_pinned, 0);
74 /* Get currently doesn't take any flags, and keys of 0 are illegal. */
75 if (flags || (nrec = *(recno_t *)key->data) == 0) {
81 * If we haven't seen this record yet, try to find it in the
84 if (nrec > t->bt_nrecs) {
85 if (F_ISSET(t, R_EOF | R_INMEM))
87 if ((status = t->bt_irec(t, nrec)) != RET_SUCCESS)
92 if ((e = __rec_search(t, nrec, SEARCH)) == NULL)
95 status = __rec_ret(t, e, 0, NULL, data);
96 if (F_ISSET(t, B_DB_LOCK))
97 mpool_put(t->bt_mp, e->page, 0);
99 t->bt_pinned = e->page;
104 * __REC_FPIPE -- Get fixed length records from a pipe.
108 * cnt: records to read
111 * RET_ERROR, RET_SUCCESS
114 __rec_fpipe(BTREE *t, recno_t top)
122 if (t->bt_rdata.size < t->bt_reclen) {
123 t->bt_rdata.data = t->bt_rdata.data == NULL ?
124 malloc(t->bt_reclen) :
125 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 = t->bt_rdata.data == NULL ?
195 malloc(t->bt_rdata.size) :
196 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 = t->bt_rdata.data == NULL ?
232 malloc(t->bt_reclen) :
233 reallocf(t->bt_rdata.data, t->bt_reclen);
234 if (t->bt_rdata.data == NULL)
236 t->bt_rdata.size = t->bt_reclen;
238 data.data = t->bt_rdata.data;
239 data.size = t->bt_reclen;
241 sp = (u_char *)t->bt_cmap;
242 ep = (u_char *)t->bt_emap;
243 for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
246 return (RET_SPECIAL);
249 for (p = t->bt_rdata.data;
250 sp < ep && len > 0; *p++ = *sp++, --len);
252 memset(p, t->bt_bval, len);
253 if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
256 t->bt_cmap = (caddr_t)sp;
257 return (RET_SUCCESS);
261 * __REC_VMAP -- Get variable length records from a file.
265 * cnt: records to read
268 * RET_ERROR, RET_SUCCESS
271 __rec_vmap(BTREE *t, recno_t top)
278 sp = (u_char *)t->bt_cmap;
279 ep = (u_char *)t->bt_emap;
282 for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
285 return (RET_SPECIAL);
287 for (data.data = sp; sp < ep && *sp != bval; ++sp);
288 data.size = sp - (u_char *)data.data;
289 if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
293 t->bt_cmap = (caddr_t)sp;
294 return (RET_SUCCESS);