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 8.3 (Berkeley) 02/21/94"; 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 = 61 (void *)realloc(t->bt_dbuf, rl->dsize + 1)) == NULL) 62 return (RET_ERROR); 63 t->bt_dbuf = p; 64 t->bt_dbufsz = rl->dsize + 1; 65 } 66 memmove(t->bt_dbuf, rl->bytes, rl->dsize); 67 data->size = rl->dsize; 68 data->data = t->bt_dbuf; 69 } else { 70 data->size = rl->dsize; 71 data->data = rl->bytes; 72 } 73 74 retkey: if (key == NULL) 75 return (RET_SUCCESS); 76 77 /* We have to copy the key, it's not on the page. */ 78 if (sizeof(recno_t) > t->bt_kbufsz) { 79 if ((p = (void *)realloc(t->bt_kbuf, sizeof(recno_t))) == NULL) 80 return (RET_ERROR); 81 t->bt_kbuf = p; 82 t->bt_kbufsz = sizeof(recno_t); 83 } 84 memmove(t->bt_kbuf, &nrec, sizeof(recno_t)); 85 key->size = sizeof(recno_t); 86 key->data = t->bt_kbuf; 87 return (RET_SUCCESS); 88 } 89