* Sebastian Hammer, Adam Dickmeiss
*
* $Log: lookgrep.c,v $
- * Revision 1.1 1994-10-03 17:23:04 adam
+ * Revision 1.10 1995-11-16 17:00:44 adam
+ * Changed stupid log.
+ *
+ * Revision 1.9 1995/10/27 13:58:09 adam
+ * Makes 'Database unavailable' diagnostic.
+ *
+ * Revision 1.8 1995/10/19 14:57:21 adam
+ * New feature: grep lookup saves length of longest prefix match.
+ *
+ * Revision 1.7 1995/10/17 18:01:22 adam
+ * Userfunc may return non-zero in which case the the grepping stops
+ * immediately.
+ *
+ * Revision 1.6 1995/10/09 16:18:32 adam
+ * Function dict_lookup_grep got extra client data parameter.
+ *
+ * Revision 1.5 1995/09/14 11:52:59 adam
+ * Grep handle function parameter info is const now.
+ *
+ * Revision 1.4 1995/01/24 16:01:02 adam
+ * Added -ansi to CFLAGS.
+ * Use new API of dfa module.
+ *
+ * Revision 1.3 1994/10/05 12:16:50 adam
+ * Pagesize is a resource now.
+ *
+ * Revision 1.2 1994/10/04 12:08:07 adam
+ * Some bug fixes and some optimizations.
+ *
+ * Revision 1.1 1994/10/03 17:23:04 adam
* First version of dictionary lookup with regular expressions and errors.
*
*/
typedef unsigned MatchWord;
#define WORD_BITS 32
+#define MAX_LENGTH 1024
typedef struct {
- int n; /* no of MatchWord needed */
- int range; /* max no. of errors */
- MatchWord *Sc; /* Mask Sc */
+ int n; /* no of MatchWord needed */
+ int range; /* max no. of errors */
+ int fact; /* (range+1)*n */
+ MatchWord *match_mask; /* match_mask */
} MatchContext;
#define INLINE
{
int off = state & (WORD_BITS-1);
int wno = state / WORD_BITS;
-
+
m[mc->n * ch + wno] |= 1<<off;
}
-static INLINE void reset_bit (MatchContext *mc, MatchWord *m, int ch,
- int state)
-{
- int off = state & (WORD_BITS-1);
- int wno = state / WORD_BITS;
-
- m[mc->n * ch + wno] &= ~(1<<off);
-}
-
static INLINE MatchWord get_bit (MatchContext *mc, MatchWord *m, int ch,
int state)
{
return m[mc->n * ch + wno] & (1<<off);
}
-static MatchContext *mk_MatchContext (DFA_states *dfas, int range)
+static MatchContext *mk_MatchContext (struct DFA *dfa, int range)
{
MatchContext *mc = xmalloc (sizeof(*mc));
- int i;
+ int s;
- mc->n = (dfas->no+WORD_BITS) / WORD_BITS;
+ mc->n = (dfa->no_states+WORD_BITS) / WORD_BITS;
mc->range = range;
- mc->Sc = xcalloc (sizeof(*mc->Sc) * 256 * mc->n, 1);
-
- for (i=0; i<dfas->no; i++)
- {
- int j;
- DFA_state *state = dfas->sortarray[i];
+ mc->fact = (range+1)*mc->n;
+ mc->match_mask = xcalloc (mc->n, sizeof(*mc->match_mask));
- for (j=0; j<state->tran_no; j++)
- {
- int ch;
- int ch0 = state->trans[j].ch[0];
- int ch1 = state->trans[j].ch[1];
- assert (ch0 >= 0 && ch1 >= 0);
-
- for (ch = ch0; ch <= ch1; ch++)
- set_bit (mc, mc->Sc, ch, i);
- }
- }
+ for (s = 0; s<dfa->no_states; s++)
+ if (dfa->states[s]->rule_no)
+ set_bit (mc, mc->match_mask, 0, s);
return mc;
}
+static void rm_MatchContext (MatchContext **mc)
+{
+ xfree ((*mc)->match_mask);
+ xfree (*mc);
+ *mc = NULL;
+}
static void mask_shift (MatchContext *mc, MatchWord *Rdst, MatchWord *Rsrc,
- DFA_states *dfas, int ch)
+ struct DFA *dfa, int ch)
{
int j, s = 0;
MatchWord *Rsrc_p = Rsrc, mask;
-#if 1
for (j = 0; j<mc->n; j++)
Rdst[j] = 0;
-#else
- Rdst[0] = 1;
- for (j = 1; j<mc->n; j++)
- Rdst[j] = 0;
-#endif
while (1)
{
mask = *Rsrc_p++;
{
if (mask & 1)
{
- DFA_state *state = dfas->sortarray[s];
+ struct DFA_state *state = dfa->states[s];
int i = state->tran_no;
while (--i >= 0)
if (ch >= state->trans[i].ch[0] &&
}
if (mask & 2)
{
- DFA_state *state = dfas->sortarray[s+1];
+ struct DFA_state *state = dfa->states[s+1];
int i = state->tran_no;
while (--i >= 0)
if (ch >= state->trans[i].ch[0] &&
}
if (mask & 4)
{
- DFA_state *state = dfas->sortarray[s+2];
+ struct DFA_state *state = dfa->states[s+2];
int i = state->tran_no;
while (--i >= 0)
if (ch >= state->trans[i].ch[0] &&
}
if (mask & 8)
{
- DFA_state *state = dfas->sortarray[s+3];
+ struct DFA_state *state = dfa->states[s+3];
int i = state->tran_no;
while (--i >= 0)
if (ch >= state->trans[i].ch[0] &&
}
}
s += 4;
- if (s >= dfas->no)
+ if (s >= dfa->no_states)
return;
mask >>= 4;
}
}
static void shift (MatchContext *mc, MatchWord *Rdst, MatchWord *Rsrc,
- DFA_states *dfas)
+ struct DFA *dfa)
{
int j, s = 0;
MatchWord *Rsrc_p = Rsrc, mask;
{
if (mask & 1)
{
- DFA_state *state = dfas->sortarray[s];
+ struct DFA_state *state = dfa->states[s];
int i = state->tran_no;
while (--i >= 0)
set_bit (mc, Rdst, 0, state->trans[i].to);
}
if (mask & 2)
{
- DFA_state *state = dfas->sortarray[s+1];
+ struct DFA_state *state = dfa->states[s+1];
int i = state->tran_no;
while (--i >= 0)
set_bit (mc, Rdst, 0, state->trans[i].to);
}
if (mask & 4)
{
- DFA_state *state = dfas->sortarray[s+2];
+ struct DFA_state *state = dfa->states[s+2];
int i = state->tran_no;
while (--i >= 0)
set_bit (mc, Rdst, 0, state->trans[i].to);
}
if (mask & 8)
{
- DFA_state *state = dfas->sortarray[s+3];
+ struct DFA_state *state = dfa->states[s+3];
int i = state->tran_no;
while (--i >= 0)
set_bit (mc, Rdst, 0, state->trans[i].to);
}
}
s += 4;
- if (s >= dfas->no)
+ if (s >= dfa->no_states)
return;
mask >>= 4;
}
Rdst[i] = Rsrc1[i] | Rsrc2[i];
}
-static int move (MatchContext *mc, MatchWord *Rj1, MatchWord *Rj,
- Dict_char ch, DFA_states *dfas, MatchWord *Rtmp)
+static INLINE int move (MatchContext *mc, MatchWord *Rj1, MatchWord *Rj,
+ Dict_char ch, struct DFA *dfa, MatchWord *Rtmp)
{
int d;
- MatchWord *Rj_a = Rtmp;
- MatchWord *Rj_b = Rtmp + mc->n;
- MatchWord *Rj_c = Rtmp + 2*mc->n;
+ MatchWord *Rtmp_2 = Rtmp + mc->n;
- mask_shift (mc, Rj1, Rj, dfas, ch);
+ mask_shift (mc, Rj1, Rj, dfa, ch);
for (d = 1; d <= mc->range; d++)
{
- mask_shift (mc, Rj_b, Rj+d*mc->n, dfas, ch); /* 1 */
-
- or (mc, Rj_a, Rj+(d-1)*mc->n, Rj1+(d-1)*mc->n); /* 2,3 */
-
- shift (mc, Rj_c, Rj_a, dfas);
+ or (mc, Rtmp, Rj, Rj1); /* 2,3 */
- or (mc, Rj_a, Rj_b, Rj_c); /* 1,2,3*/
+ shift (mc, Rtmp_2, Rtmp, dfa);
+
+ mask_shift (mc, Rtmp, Rj+mc->n, dfa, ch); /* 1 */
+
+ or (mc, Rtmp, Rtmp_2, Rtmp); /* 1,2,3*/
+
+ Rj1 += mc->n;
- or (mc, Rj1+d*mc->n, Rj_a, Rj+(d-1)*mc->n); /* 1,2,3,4 */
+ or (mc, Rj1, Rtmp, Rj); /* 1,2,3,4 */
+
+ Rj += mc->n;
}
return 1;
static int dict_grep (Dict dict, Dict_ptr ptr, MatchContext *mc,
- MatchWord *Rj, int pos,
- int (*userfunc)(Dict_char *name, char *info),
- Dict_char *prefix, DFA_states *dfas)
+ MatchWord *Rj, int pos, void *client,
+ int (*userfunc)(Dict_char *, const char *, void *),
+ Dict_char *prefix, struct DFA *dfa,
+ int *max_pos)
{
- int lo, hi;
+ int lo, hi, d;
void *p;
short *indxp;
char *info;
dict_bf_readp (dict->dbf, ptr, &p);
lo = 0;
hi = DICT_nodir(p)-1;
- indxp = (short*) ((char*) p+DICT_PAGESIZE-sizeof(short));
+ indxp = (short*) ((char*) p+DICT_pagesize(dict)-sizeof(short));
+
while (lo <= hi)
{
if (indxp[-lo] > 0)
for (j=0; ; j++)
{
Dict_char ch;
- int s, d;
- MatchWord *Rj0 = Rj + j *(1+mc->range)*mc->n;
- MatchWord *Rj1 = Rj + (j+1)*(1+mc->range)*mc->n;
- MatchWord *Rj_tmp = Rj + (j+2)*(1+mc->range)*mc->n;
+ MatchWord *Rj0 = Rj + j *mc->fact;
+ MatchWord *Rj1 = Rj + (j+1)*mc->fact;
+ MatchWord *Rj_tmp = Rj + (j+2)*mc->fact;
memcpy (&ch, info+j*sizeof(Dict_char), sizeof(Dict_char));
prefix[pos+j] = ch;
+ if (pos+j > *max_pos)
+ *max_pos = pos+j;
if (ch == DICT_EOS)
{
if (was_match)
- (*userfunc)(prefix, info+(j+1)*sizeof(Dict_char));
+ if ((*userfunc)(prefix, info+(j+1)*sizeof(Dict_char),
+ client))
+ return 1;
break;
}
-
- was_match = 0;
- move (mc, Rj1, Rj0, ch, dfas, Rj_tmp);
+ move (mc, Rj1, Rj0, ch, dfa, Rj_tmp);
for (d = mc->n; --d >= 0; )
if (Rj1[mc->range*mc->n + d])
break;
if (d < 0)
break;
- for (s = 0; s<dfas->no; s++)
- {
- if (dfas->sortarray[s]->rule_no)
- if (get_bit (mc, Rj1+mc->range*mc->n, 0, s))
- was_match = 1;
- }
- for (d = 0; d <= mc->range; d++)
- reset_bit (mc, Rj1+d*mc->n, 0, dfas->no);
+ was_match = 0;
+ for (d = mc->n; --d >= 0; )
+ if (Rj1[mc->range*mc->n + d] & mc->match_mask[d])
+ {
+ was_match = 1;
+ break;
+ }
}
}
else
{
- MatchWord *Rj1 = Rj+ (1+mc->range)*mc->n;
- MatchWord *Rj_tmp = Rj+2*(1+mc->range)*mc->n;
+ MatchWord *Rj1 = Rj+ mc->fact;
+ MatchWord *Rj_tmp = Rj+2*mc->fact;
Dict_char ch;
- int d;
/* Dict_ptr subptr */
/* Dict_char sub char */
memcpy (&ch, info+sizeof(Dict_ptr), sizeof(Dict_char));
prefix[pos] = ch;
- move (mc, Rj1, Rj, ch, dfas, Rj_tmp);
+ if (pos > *max_pos)
+ *max_pos = pos;
+ move (mc, Rj1, Rj, ch, dfa, Rj_tmp);
for (d = mc->n; --d >= 0; )
if (Rj1[mc->range*mc->n + d])
break;
Dict_ptr subptr;
if (info[sizeof(Dict_ptr)+sizeof(Dict_char)])
{
- int s;
- for (s = 0; s<dfas->no; s++)
- if (dfas->sortarray[s]->rule_no)
- if (get_bit (mc, Rj1+mc->range*mc->n, 0, s))
- {
- prefix[pos+1] = DICT_EOS;
- (*userfunc)(prefix, info+sizeof(Dict_ptr)+
- sizeof(Dict_char));
- break;
- }
+ for (d = mc->n; --d >= 0; )
+ if (Rj1[mc->range*mc->n + d] & mc->match_mask[d])
+ {
+ prefix[pos+1] = DICT_EOS;
+ if ((*userfunc)(prefix, info+sizeof(Dict_ptr)+
+ sizeof(Dict_char), client))
+ return 1;
+ break;
+ }
}
memcpy (&subptr, info, sizeof(Dict_ptr));
if (subptr)
{
- dict_grep (dict, subptr, mc, Rj1, pos+1,
- userfunc, prefix, dfas);
+ if (dict_grep (dict, subptr, mc, Rj1, pos+1,
+ client, userfunc, prefix, dfa, max_pos))
+ return 1;
dict_bf_readp (dict->dbf, ptr, &p);
- indxp = (short*) ((char*) p+DICT_PAGESIZE-sizeof(short));
+ indxp = (short*) ((char*) p+DICT_pagesize(dict)
+ -sizeof(short));
}
}
}
return 0;
}
-int dict_lookup_grep (Dict dict, Dict_char *pattern, int range,
- int (*userfunc)(Dict_char *name, char *info))
+int dict_lookup_grep (Dict dict, Dict_char *pattern, int range, void *client,
+ int *max_pos,
+ int (*userfunc)(Dict_char *name, const char *info,
+ void *client))
{
MatchWord *Rj;
- Dict_char prefix[2048];
+ Dict_char prefix[MAX_LENGTH+1];
char *this_pattern = pattern;
- DFA_states *dfas;
MatchContext *mc;
- DFA *dfa = init_dfa();
+ struct DFA *dfa = dfa_init();
int i, d;
- i = parse_dfa (dfa, &this_pattern, dfa_thompson_chars);
+ i = dfa_parse (dfa, &this_pattern);
if (i || *this_pattern)
{
- rm_dfa (&dfa);
+ dfa_delete (&dfa);
return -1;
}
- dfa->root = dfa->top;
- dfas = mk_dfas (dfa, 200);
- rm_dfa (&dfa);
+ dfa_mkstate (dfa);
- mc = mk_MatchContext (dfas, range);
+ mc = mk_MatchContext (dfa, range);
- Rj = xcalloc ((1000+dict_strlen(pattern)+range+2)*(range+1)*mc->n,
- sizeof(*Rj));
+ Rj = xcalloc ((MAX_LENGTH+1) * mc->n, sizeof(*Rj));
set_bit (mc, Rj, 0, 0);
for (d = 1; d<=mc->range; d++)
{
int s;
memcpy (Rj + mc->n * d, Rj + mc->n * (d-1), mc->n * sizeof(*Rj));
- for (s = 0; s<dfas->no; s++)
+ for (s = 0; s<dfa->no_states; s++)
{
if (get_bit (mc, Rj, d-1, s))
{
- DFA_state *state = dfas->sortarray[s];
+ struct DFA_state *state = dfa->states[s];
int i = state->tran_no;
while (--i >= 0)
set_bit (mc, Rj, d, state->trans[i].to);
}
}
}
- i = dict_grep (dict, 1, mc, Rj, 0, userfunc, prefix, dfas);
-
- rm_dfas (&dfas);
+ *max_pos = 0;
+ i = dict_grep (dict, 1, mc, Rj, 0, client, userfunc, prefix, dfa,
+ max_pos);
+ logf (LOG_DEBUG, "max_pos = %d", *max_pos);
+ dfa_delete (&dfa);
xfree (Rj);
+ rm_MatchContext (&mc);
return i;
}
-
-
-