1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)rec_utils.c 8.2 (Berkeley) 09/07/93"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/param.h> 13 14 #include <stdio.h> 15 #include <stdlib.h> 16 #include <string.h> 17 18 #include <db.h> 19 #include "recno.h" 20 21 /* 22 * __REC_RET -- Build return data as a result of search or scan. 23 * 24 * Parameters: 25 * t: tree 26 * d: LEAF to be returned to the user. 27 * data: user's data structure 28 * 29 * Returns: 30 * RET_SUCCESS, RET_ERROR. 31 */ 32 int 33 __rec_ret(t, e, nrec, key, data) 34 BTREE *t; 35 EPG *e; 36 recno_t nrec; 37 DBT *key, *data; 38 { 39 register RLEAF *rl; 40 register void *p; 41 42 if (data == NULL) 43 goto retkey; 44 45 rl = GETRLEAF(e->page, e->index); 46 47 /* 48 * We always copy big data to make it contigous. Otherwise, we 49 * leave the page pinned and don't copy unless the user specified 50 * concurrent access. 51 */ 52 if (rl->flags & P_BIGDATA) { 53 if (__ovfl_get(t, rl->bytes, 54 &data->size, &t->bt_dbuf, &t->bt_dbufsz)) 55 return (RET_ERROR); 56 data->data = t->bt_dbuf; 57 } else if (ISSET(t, B_DB_LOCK)) { 58 /* Use +1 in case the first record retrieved is 0 length. */ 59 if (rl->dsize + 1 > t->bt_dbufsz) { 60 if ((p = realloc(t->bt_dbuf, rl->dsize + 1)) == NULL) 61 return (RET_ERROR); 62 t->bt_dbuf = p; 63 t->bt_dbufsz = rl->dsize + 1; 64 } 65 memmove(t->bt_dbuf, rl->bytes, rl->dsize); 66 data->size = rl->dsize; 67 data->data = t->bt_dbuf; 68 } else { 69 data->size = rl->dsize; 70 data->data = rl->bytes; 71 } 72 73 retkey: if (key == NULL) 74 return (RET_SUCCESS); 75 76 /* We have to copy the key, it's not on the page. */ 77 if (sizeof(recno_t) > t->bt_kbufsz) { 78 if ((p = realloc(t->bt_kbuf, sizeof(recno_t))) == NULL) 79 return (RET_ERROR); 80 t->bt_kbuf = p; 81 t->bt_kbufsz = sizeof(recno_t); 82 } 83 memmove(t->bt_kbuf, &nrec, sizeof(recno_t)); 84 key->size = sizeof(recno_t); 85 key->data = t->bt_kbuf; 86 return (RET_SUCCESS); 87 } 88