gdbmobj/gdbmobj2.c

   1 /*
   2 ** Copyright 1998 - 1999 Double Precision, Inc.  See COPYING for
   3 ** distribution information.
   4 */
   5
   6 #include        "gdbmobj.h"
   7
   8 static char *fetchkeyval(struct gdbmobj *obj, size_t *, char **, size_t *);
   9 extern char *gdbm_dofetch(struct gdbmobj *, const char *, size_t, size_t *);
  10
  11 char    *gdbmobj_firstkey(struct gdbmobj *obj, size_t *keylen, char **val,
  12         size_t *vallen)
  13 {
  14 datum   key;
  15
  16         if (!obj->has_dbf)      return (0);
  17
  18         if (obj->prev_key)      free(obj->prev_key);
  19         obj->prev_key=0;
  20
  21         key=gdbm_firstkey(obj->dbf);
  22
  23         if (!key.dptr)  return (0);
  24
  25         obj->prev_key=key.dptr;
  26         obj->prev_key_len=key.dsize;
  27         return (fetchkeyval(obj, keylen, val, vallen));
  28 }
  29
  30
  31 static char *fetchkeyval(struct gdbmobj *obj, size_t *keylen, char **val,
  32         size_t *vallen)
  33 {
  34         if (!obj->prev_key)     return (0);
  35         *val=gdbm_dofetch(obj, obj->prev_key, obj->prev_key_len, vallen);
  36         *keylen=obj->prev_key_len;
  37         return (obj->prev_key);
  38 }
  39
  40 char    *gdbmobj_nextkey(struct gdbmobj *obj, size_t *keylen,
  41         char **val, size_t *vallen)
  42 {
  43 datum   dkey, key;
  44
  45         if (!obj->has_dbf || !obj->prev_key)    return (0);
  46
  47         dkey.dptr=(char *)obj->prev_key;
  48         dkey.dsize=obj->prev_key_len;
  49
  50         key=gdbm_nextkey(obj->dbf, dkey);
  51
  52         free(obj->prev_key);
  53         obj->prev_key=key.dptr;
  54         obj->prev_key_len=key.dsize;
  55         return (fetchkeyval(obj, keylen, val, vallen));
  56 }