* Sebastian Hammer, Adam Dickmeiss
*
* $Log: insert.c,v $
- * Revision 1.7 1994-09-12 08:06:42 adam
+ * Revision 1.9 1994-09-16 15:39:13 adam
+ * Initial code of lookup - not tested yet.
+ *
+ * Revision 1.8 1994/09/16 12:35:01 adam
+ * New version of split_page which use clean_page for splitting.
+ *
+ * Revision 1.7 1994/09/12 08:06:42 adam
* Futher development of insert.c
*
* Revision 1.6 1994/09/06 13:05:15 adam
static int dict_ins (Dict dict, const Dict_char *str,
Dict_ptr back_ptr, int userlen, void *userinfo);
+static void clean_page (Dict dict, Dict_ptr ptr, void *p, Dict_char *out,
+ Dict_ptr subptr, char *userinfo);
static Dict_ptr new_page (Dict dict, Dict_ptr back_ptr, void **pp)
void *subp;
char *info_here;
Dict_ptr subptr;
- int i, need;
- short *indxp, *best_indxp;
+ int i;
+ short *indxp, *best_indxp = NULL;
Dict_char best_char = 0;
Dict_char prev_char = 0;
int best_no = -1, no_current = 1;
+ /* determine splitting char... */
indxp = (short*) ((char*) p+DICT_PAGESIZE-sizeof(short));
for (i = DICT_nodir (p); --i >= 0; --indxp)
{
info_here = NULL;
for (indxp=best_indxp, i=0; i<best_no; i++, indxp++)
{
- char *info;
+ char *info, *info1;
int slen;
assert (*indxp > 0);
assert (!info_here);
info_here = info+(slen+1)*sizeof(Dict_char);
}
- }
- /* calculate the amount of bytes needed for this entry when */
- /* transformed to a sub entry */
- need = sizeof(Dict_char)+sizeof(Dict_ptr)+1;
- if (info_here)
- need += *info_here;
-
- indxp = best_indxp;
- /* now loop on all entries with string length > 1 i.e. all */
- /* those entries which contribute to a sub page */
- best_indxp = NULL;
- for (i=0; i<best_no; i++, indxp++)
- {
- char *info, *info1;
- int slen;
-
- assert (*indxp > 0);
-
- info = (char*) p + *indxp; /* entry start */
- assert (*info == best_char);
- slen = dict_strlen(info);
-
- if (slen > 1)
+ else
{
info1 = info+(1+slen)*sizeof(Dict_char); /* info start */
-
- if (need <= (1+slen)*sizeof(Dict_char) + 1 + *info1)
- best_indxp = indxp; /* space for entry */
dict_ins (dict, info+sizeof(Dict_char), subptr, *info1, info1+1);
dict_bf_readp (dict->dbf, ptr, &p);
}
}
- if (best_indxp)
- { /* there was a hole big enough for a sub entry */
- char *info = (char*) p + *best_indxp;
- short *indxp1;
-
- *--indxp = - *best_indxp;
- DICT_type(p) = 1;
- DICT_nodir (p) -= (best_no-1);
- indxp1 = (short*)((char*)p+DICT_PAGESIZE-DICT_nodir(p)*sizeof(short));
- while (indxp != indxp1)
- {
- --indxp;
- *indxp = indxp[1-best_no];
- }
- memcpy (info, &subptr, sizeof(Dict_ptr)); /* store subptr */
- info += sizeof(Dict_ptr);
- memcpy (info, &best_char, sizeof(Dict_char)); /* store sub char */
- info += sizeof(Dict_char);
- if (info_here)
- memcpy (info, info_here, *info_here+1); /* with information */
- else
- *info = 0; /* without info */
-#if CHECK
- best_indxp = NULL;
- prev_char = 0;
- indxp = (short*) ((char*) p+DICT_PAGESIZE-sizeof(short));
- for (i = DICT_nodir (p); --i >= 0; --indxp)
- {
- if (*indxp > 0) /* tail string here! */
- {
- Dict_char dc;
-
- memcpy (&dc, (char*) p + *indxp, sizeof(dc));
- assert (dc != best_char);
- assert (dc >= prev_char);
- prev_char = dc;
- }
- else
- {
- Dict_char dc;
- memcpy (&dc, (char*)p - *indxp+sizeof(Dict_ptr),
- sizeof(dc));
- assert (dc > prev_char);
- if (dc == best_char)
- {
- assert (best_indxp == NULL);
- best_indxp = indxp;
- }
- prev_char = dc;
- }
- }
- assert (best_indxp);
-#endif
- }
- else
- {
- short *indxp1, *indxp2;
- assert (0);
- DICT_type(p) = 1;
- DICT_nodir(p) -= best_no;
- indxp2 = indxp;
- indxp1 = (short*)((char*) p+DICT_PAGESIZE-DICT_nodir(p)*sizeof(short));
- do
- {
- --indxp2;
- indxp2[0] = indxp2[-best_no];
- } while (indxp2 != indxp1);
- }
+ /* now clean the page ... */
+ clean_page (dict, ptr, p, &best_char, subptr, info_here);
return 0;
}
-static void clean_page (Dict dict, Dict_ptr ptr, void *p, Dict_char *out)
+static void clean_page (Dict dict, Dict_ptr ptr, void *p, Dict_char *out,
+ Dict_ptr subptr, char *userinfo)
{
char *np = xmalloc (dict->head.page_size);
int i, slen, no = 0;
info1 = (char*) p + *indxp1;
if (out && memcmp (out, info1, sizeof(Dict_char)) == 0)
+ {
+ if (subptr == 0)
+ continue;
+ *--indxp2 = -(info2 - np);
+ memcpy (info2, &subptr, sizeof(Dict_ptr));
+ info2 += sizeof(Dict_ptr);
+ memcpy (info2, out, sizeof(Dict_char));
+ info2 += sizeof(Dict_char);
+ if (userinfo)
+ {
+ memcpy (info2, userinfo, *userinfo+1);
+ info2 += *userinfo + 1;
+ }
+ else
+ *info2++ = 0;
+ subptr = 0;
+ ++no;
continue;
+ }
*--indxp2 = info2 - np;
slen = (dict_strlen(info1)+1)*sizeof(Dict_char);
memcpy (info2, info1, slen);
+ info1 += slen;
info2 += slen;
- info1 += slen;
}
else
{
*--indxp2 = -(info2 - np);
info1 = (char*) p - *indxp1;
memcpy (info2, info1, sizeof(Dict_ptr)+sizeof(Dict_char));
+ info1 += sizeof(Dict_ptr)+sizeof(Dict_char);
info2 += sizeof(Dict_ptr)+sizeof(Dict_char);
- info1 += sizeof(Dict_ptr)+sizeof(Dict_char);
}
slen = *info1+1;
memcpy (info2, info1, slen);
DICT_type(p) = 0;
DICT_nodir(p) = no;
xfree (np);
+ dict_bf_touch (dict->dbf, ptr);
}
static int dict_ins (Dict dict, const Dict_char *str,
Dict_ptr back_ptr, int userlen, void *userinfo)
{
- int hi, lo, mid, i, slen, cmp = 1;
+ int hi, lo, mid, slen, cmp = 1;
Dict_ptr ptr = back_ptr;
short *indxp;
char *info;
{
if (DICT_type(p) == 1)
{
- clean_page (dict, ptr, p, NULL);
- dict_bf_touch (dict->dbf, ptr);
+ clean_page (dict, ptr, p, NULL, 0, NULL);
return dict_ins (dict, str-1, ptr,
userlen, userinfo);
}
if (DICT_size(p)+slen+userlen >=
DICT_PAGESIZE - (1+DICT_nodir(p))*sizeof(short)) /* overflow? */
{
- if (DICT_type(p) == 1)
- {
- clean_page (dict, ptr, p, NULL);
- dict_bf_touch (dict->dbf, ptr);
- return dict_ins (dict, str, ptr, userlen, userinfo);
- }
- i = 0;
- do
- {
- assert (i <= 1);
- if (split_page (dict, ptr, p))
- {
- log (LOG_FATAL, "Unable to split page %d\n", ptr);
- abort ();
- }
- if (DICT_size(p)+slen+userlen <
- DICT_PAGESIZE - (1+DICT_nodir(p))*sizeof(short))
- break;
- i++;
- clean_page (dict, ptr, p, NULL);
- } while (DICT_size(p)+slen+userlen > DICT_PAGESIZE -
- (1+DICT_nodir(p))*sizeof(short));
+ split_page (dict, ptr, p);
return dict_ins (dict, str, ptr, userlen, userinfo);
}
if (cmp)
projects / idzebra-moved-to-github.git / blobdiff