rec_get.c File Reference

#include <sys/types.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "../include/db.h"
#include "recno.h"

Include dependency graph for rec_get.c:

Go to the source code of this file.

Functions
int	__rec_fmap (BTREE *t, recno_t top)
int	__rec_fpipe (BTREE *t, recno_t top)
int	__rec_get (DB *dbp, const DBT *key, DBT *data, u_int flags) const
int	__rec_vmap (BTREE *t, recno_t top)
int	__rec_vpipe (BTREE *t, recno_t top)

Function Documentation

__rec_fmap()

int __rec_fmap	(	BTREE *	t,
		recno_t	top
	)

Definition at line 235 of file rec_get.c.

References __rec_iput(), _btree::bt_bval, _btree::bt_cmap, _btree::bt_emap, _btree::bt_nrecs, _btree::bt_rdata, _btree::bt_reclen, DBT::data, F_SET, len(), malloc(), NULL, R_EOF, realloc, RET_ERROR, RET_SPECIAL, RET_SUCCESS, and DBT::size.

Referenced by __rec_open().

{
 DBT data;
 recno_t nrec;
 u_char *sp, *ep, *p;
 size_t len;

 if (t->bt_rdata.size < t->bt_reclen) {
 t->bt_rdata.data = t->bt_rdata.data == NULL ?
 malloc(t->bt_reclen) :
 realloc(t->bt_rdata.data, t->bt_reclen);
 if (t->bt_rdata.data == NULL)
 return (RET_ERROR);
 t->bt_rdata.size = t->bt_reclen;
 }
 data.data = t->bt_rdata.data;
 data.size = t->bt_reclen;

 sp = (u_char *)t->bt_cmap;
 ep = (u_char *)t->bt_emap;
 for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
 if (sp >= ep) {
 F_SET(t, R_EOF);
 return (RET_SPECIAL);
 }
 len = t->bt_reclen;
 for (p = t->bt_rdata.data;
 sp < ep && len > 0; *p++ = *sp++, --len);
 if (len != 0)
 memset(p, t->bt_bval, len);
 if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
 return (RET_ERROR);
 }
 t->bt_cmap = (caddr_t)sp;
 return (RET_SUCCESS);
}

__rec_fpipe()

int __rec_fpipe	(	BTREE *	t,
		recno_t	top
	)

Definition at line 122 of file rec_get.c.

References __rec_iput(), _btree::bt_bval, _btree::bt_nrecs, _btree::bt_rdata, _btree::bt_reclen, _btree::bt_rfp, DBT::data, F_SET, len(), malloc(), NULL, R_EOF, realloc, RET_ERROR, RET_SPECIAL, RET_SUCCESS, and DBT::size.

Referenced by __rec_open().

{
 DBT data;
 recno_t nrec;
 size_t len;
 int ch;
 u_char *p;

 if (t->bt_rdata.size < t->bt_reclen) {
 t->bt_rdata.data = t->bt_rdata.data == NULL ?
 malloc(t->bt_reclen) :
 realloc(t->bt_rdata.data, t->bt_reclen);
 if (t->bt_rdata.data == NULL)
 return (RET_ERROR);
 t->bt_rdata.size = t->bt_reclen;
 }
 data.data = t->bt_rdata.data;
 data.size = t->bt_reclen;

 for (nrec = t->bt_nrecs; nrec < top;) {
 len = t->bt_reclen;
 for (p = t->bt_rdata.data;; *p++ = ch)
 if ((ch = getc(t->bt_rfp)) == EOF || !--len) {
 if (ch != EOF)
 *p = ch;
 if (len != 0)
 memset(p, t->bt_bval, len);
 if (__rec_iput(t,
 nrec, &data, 0) != RET_SUCCESS)
 return (RET_ERROR);
 ++nrec;
 break;
 }
 if (ch == EOF)
 break;
 }
 if (nrec < top) {
 F_SET(t, R_EOF);
 return (RET_SPECIAL);
 }
 return (RET_SUCCESS);
}

__rec_get()

int __rec_get	(	DB *	dbp,
		const DBT *	key,
		DBT *	data,
		u_int	flags
	)		const

Definition at line 63 of file rec_get.c.

References __rec_ret(), __rec_search(), B_DB_LOCK, _btree::bt_mp, _btree::bt_nrecs, _btree::bt_pinned, DBT::data, errno, F_ISSET, __db::internal, mpool_put(), NULL, _epg::page, R_EOF, R_INMEM, RET_ERROR, RET_SPECIAL, RET_SUCCESS, SEARCH, and status.

Referenced by __rec_open().

{
 BTREE *t;
 EPG *e;
 recno_t nrec;
 int status;

 t = dbp->internal;

 /* Toss any page pinned across calls. */
 if (t->bt_pinned != NULL) {
 mpool_put(t->bt_mp, t->bt_pinned, 0);
 t->bt_pinned = NULL;
 }

 /* Get currently doesn't take any flags, and keys of 0 are illegal. */
 if (flags || (nrec = *(recno_t *)key->data) == 0) {
 errno = EINVAL;
 return (RET_ERROR);
 }

 /*
 * If we haven't seen this record yet, try to find it in the
 * original file.
 */
 if (nrec > t->bt_nrecs) {
 if (F_ISSET(t, R_EOF | R_INMEM))
 return (RET_SPECIAL);
 if ((status = t->bt_irec(t, nrec)) != RET_SUCCESS)
 return (status);
 }

 --nrec;
 if ((e = __rec_search(t, nrec, SEARCH)) == NULL)
 return (RET_ERROR);

 status = __rec_ret(t, e, 0, NULL, data);
 if (F_ISSET(t, B_DB_LOCK))
 mpool_put(t->bt_mp, e->page, 0);
 else
 t->bt_pinned = e->page;
 return (status);
}

__rec_vmap()

int __rec_vmap	(	BTREE *	t,
		recno_t	top
	)

Definition at line 285 of file rec_get.c.

References __rec_iput(), _btree::bt_bval, _btree::bt_cmap, _btree::bt_emap, _btree::bt_nrecs, DBT::data, F_SET, if(), R_EOF, RET_ERROR, RET_SPECIAL, RET_SUCCESS, and DBT::size.

Referenced by __rec_open().

{
 DBT data;
 u_char *sp, *ep;
 recno_t nrec;
 int bval;

 sp = (u_char *)t->bt_cmap;
 ep = (u_char *)t->bt_emap;
 bval = t->bt_bval;

 for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
 if (sp >= ep) {
 F_SET(t, R_EOF);
 return (RET_SPECIAL);
 }
 for (data.data = sp; sp < ep && *sp != bval; ++sp);
 data.size = sp - (u_char *)data.data;
 if (__rec_iput(t, nrec, &data, 0) != RET_SUCCESS)
 return (RET_ERROR);
 ++sp;
 }
 t->bt_cmap = (caddr_t)sp;
 return (RET_SUCCESS);
}

__rec_vpipe()

int __rec_vpipe	(	BTREE *	t,
		recno_t	top
	)

Definition at line 178 of file rec_get.c.

References __rec_iput(), _btree::bt_bval, _btree::bt_nrecs, _btree::bt_rdata, _btree::bt_rfp, DBT::data, F_SET, if(), len(), malloc(), NULL, R_EOF, realloc, RET_ERROR, RET_SPECIAL, RET_SUCCESS, and DBT::size.

Referenced by __rec_open().

{
 DBT data;
 recno_t nrec;
 indx_t len;
 size_t sz;
 int bval, ch;
 u_char *p;

 bval = t->bt_bval;
 for (nrec = t->bt_nrecs; nrec < top; ++nrec) {
 for (p = t->bt_rdata.data,
 sz = t->bt_rdata.size;; *p++ = ch, --sz) {
 if ((ch = getc(t->bt_rfp)) == EOF || ch == bval) {
 data.data = t->bt_rdata.data;
 data.size = p - (u_char *)t->bt_rdata.data;
 if (ch == EOF && data.size == 0)
 break;
 if (__rec_iput(t, nrec, &data, 0)
 != RET_SUCCESS)
 return (RET_ERROR);
 break;
 }
 if (sz == 0) {
 len = p - (u_char *)t->bt_rdata.data;
 t->bt_rdata.size += (sz = 256);
 t->bt_rdata.data = t->bt_rdata.data == NULL ?
 malloc(t->bt_rdata.size) :
 realloc(t->bt_rdata.data, t->bt_rdata.size);
 if (t->bt_rdata.data == NULL)
 return (RET_ERROR);
 p = (u_char *)t->bt_rdata.data + len;
 }
 }
 if (ch == EOF)
 break;
 }
 if (nrec < top) {
 F_SET(t, R_EOF);
 return (RET_SPECIAL);
 }
 return (RET_SUCCESS);
}