bdbobj/bdbobj2.c

   1 /*
   2 ** Copyright 1998 - 1999 Double Precision, Inc.  See COPYING for
   3 ** distribution information.
   4 */
   5
   6 #include        <string.h>
   7 #include        <stdlib.h>
   8 #include        "bdbobj.h"
   9
  10 char    *bdbobj_firstkey(struct bdbobj *obj, size_t *keylen, char **val,
  11         size_t *vallen)
  12 {
  13 DBT     key, value;
  14
  15         if (!obj->has_dbf)      return (0);
  16
  17         memset(&key, 0, sizeof(key));
  18         memset(&value, 0, sizeof(value));
  19
  20 #if     DB_VERSION_MAJOR < 2
  21         if ((*obj->dbf->seq)(obj->dbf, &key, &value, R_FIRST))  return (0);
  22 #else
  23         if (obj->has_dbc)
  24         {
  25                 (*obj->dbc->c_close)(obj->dbc);
  26                 obj->has_dbc=0;
  27         }
  28
  29 #if DB_VERSION_MAJOR > 2
  30         if ((*obj->dbf->cursor)(obj->dbf, 0, &obj->dbc, 0))     return (0);
  31 #else
  32 #if DB_VERSION_MINOR >= 5
  33         if ((*obj->dbf->cursor)(obj->dbf, 0, &obj->dbc, 0))     return (0);
  34 #else
  35         if ((*obj->dbf->cursor)(obj->dbf, 0, &obj->dbc))        return (0);
  36 #endif
  37 #endif
  38         obj->has_dbc=1;
  39
  40         if ((*obj->dbc->c_get)(obj->dbc, &key, &value, DB_FIRST)) return (0);
  41 #endif
  42         *keylen=key.size;
  43         *vallen=value.size;
  44         if ((*val=(char *)malloc(*vallen)) == 0)        return (0);
  45
  46         memcpy(*val, value.data, *vallen);
  47         return ((char *)key.data);
  48 }
  49
  50 char    *bdbobj_nextkey(struct bdbobj *obj, size_t *keylen, char **val,
  51         size_t *vallen)
  52 {
  53 DBT     key, value;
  54
  55         if (!obj->has_dbf)      return (0);
  56
  57         memset(&key, 0, sizeof(key));
  58         memset(&value, 0, sizeof(value));
  59
  60 #if     DB_VERSION_MAJOR < 2
  61         if ((*obj->dbf->seq)(obj->dbf, &key, &value, R_NEXT))   return (0);
  62 #else
  63         if (!obj->has_dbc)      return (0);
  64
  65         if ((*obj->dbc->c_get)(obj->dbc, &key, &value, DB_NEXT))
  66         {
  67                 (*obj->dbc->c_close)(obj->dbc);
  68                 obj->has_dbc=0;
  69         }
  70 #endif
  71
  72         *keylen=key.size;
  73         *vallen=value.size;
  74         if ((*val=(char *)malloc(*vallen + 1)) == 0)    return (0);
  75
  76         memcpy(*val, value.data, *vallen);
  77         (*val)[*vallen]=0;
  78
  79         return ((char *)key.data);
  80 }