--- /dev/null
+/*
+ * Copyright (C) 1994, Index Data I/S
+ * All rights reserved.
+ * Sebastian Hammer, Adam Dickmeiss
+ *
+ * $Log: delete.c,v $
+ * Revision 1.1 1995-12-06 14:52:21 adam
+ * New function: dict_delete.
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <assert.h>
+
+#include <dict.h>
+
+static int dict_del (Dict dict, const Dict_char *str)
+{
+ Dict_ptr ptr = 1;
+ int mid, lo, hi;
+ int cmp;
+ void *p;
+ short *indxp;
+ char *info;
+
+ dict_bf_readp (dict->dbf, ptr, &p);
+ mid = lo = 0;
+ hi = DICT_nodir(p)-1;
+ indxp = (short*) ((char*) p+DICT_pagesize(dict)-sizeof(short));
+ while (lo <= hi)
+ {
+ mid = (lo+hi)/2;
+ if (indxp[-mid] > 0)
+ {
+ /* string (Dict_char *) DICT_EOS terminated */
+ /* unsigned char length of information */
+ /* char * information */
+ info = (char*)p + indxp[-mid];
+ cmp = dict_strcmp((Dict_char*) info, str);
+ if (!cmp)
+ {
+ while (mid < hi)
+ {
+ indxp[-mid] = indxp[-mid-1];
+ mid++;
+ }
+ (DICT_nodir(p))--;
+ dict_bf_touch (dict->dbf, ptr);
+ return 1;
+ }
+ }
+ else
+ {
+ Dict_char dc;
+ Dict_ptr subptr;
+
+ /* Dict_ptr subptr */
+ /* Dict_char sub char */
+ /* unsigned char length of information */
+ /* char * information */
+ info = (char*)p - indxp[-mid];
+ memcpy (&dc, info+sizeof(Dict_ptr), sizeof(Dict_char));
+ cmp = dc- *str;
+ if (!cmp)
+ {
+ memcpy (&subptr, info, sizeof(Dict_ptr));
+ if (*++str == DICT_EOS)
+ {
+ if (info[sizeof(Dict_ptr)+sizeof(Dict_char)])
+ {
+ info[sizeof(Dict_ptr)+sizeof(Dict_char)] = 0;
+ dict_bf_touch (dict->dbf, ptr);
+ return 1;
+ }
+ return 0;
+ }
+ else
+ {
+ if (subptr == 0)
+ return 0;
+ ptr = subptr;
+ dict_bf_readp (dict->dbf, ptr, &p);
+ mid = lo = 0;
+ hi = DICT_nodir(p)-1;
+ indxp = (short*) ((char*) p+DICT_pagesize(dict)
+ -sizeof(short));
+ continue;
+ }
+ }
+ }
+ if (cmp < 0)
+ lo = mid+1;
+ else
+ hi = mid-1;
+ }
+ return 0;
+}
+
+int dict_delete (Dict dict, const Dict_char *p)
+{
+ if (dict->head.last == 1)
+ return 0;
+ return dict_del (dict, p);
+}