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);
}