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ASEARCH1.C
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C/C++ Source or Header
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1992-01-17
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5KB
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132 lines
/* Copyright (c) 1991 Sun Wu and Udi Manber. All Rights Reserved. */
#include "agrep.h"
extern unsigned Init1, Init[], Mask[], endposition, D_endpos;
extern unsigned NO_ERR_MASK;
extern int TRUNCATE, DELIMITER, AND, I, S, DD, INVERSE, FILENAMEONLY ;
extern char CurrentFileName[];
extern int num_of_matched;
asearch1(old_D_pat, Text, D)
char old_D_pat[]; int Text; register unsigned D;
{
register unsigned end, i, r1, r2, r3, r4, r5, CMask, D_Mask, Init0, k, endpos;
register unsigned r_NO_ERR;
unsigned A[MaxError*2+1], B[MaxError*2+1];
int D_length, ResidueSize, lasti, num_read, FIRSTROUND, j=0;
char buffer[BlockSize+Max_record+1];
if(I == 0) Init1 = 037777777777;
if(DD > D) DD = D+1;
if(I > D) I = D+1;
if(S > D) S = D+1;
D_length = strlen(old_D_pat);
buffer[Max_record-1] = '\n';
lasti = Max_record;
r_NO_ERR = NO_ERR_MASK;
D_Mask = D_endpos;
for(i=1 ; i<D_length; i++) D_Mask = (D_Mask << 1) | D_Mask;
D_Mask = ~D_Mask;
endpos = D_endpos;
r3 = D+1; r4 = D*2; /* to make sure in register */
for(k=0; k < D; k++) A[k] = B[k] = 0;
for(k=D; k <= r4; k++) A[k] = B[k] = Init[0];
while ((num_read = fill_buf(Text, buffer + Max_record, Max_record)) > 0)
{
i=Max_record; end = Max_record + num_read;
if(FIRSTROUND) { i = Max_record -1 ;
if(DELIMITER) {
for(k=0; k<D_length; k++) {
if(old_D_pat[k] != buffer[Max_record+k]) break;
}
if(k>=D_length) j--;
}
FIRSTROUND = 0; }
if(num_read < BlockSize) {
strncpy(buffer+Max_record+num_read, old_D_pat, D_length);
end = end + D_length;
buffer[end] = '\0';
}
while (i < end)
{
CMask = Mask[buffer[i++]];
r1 = Init1 & B[D];
A[D] = ((B[D] >> 1) & CMask ) | r1;
for(k = r3; k <= r4; k++) /* r3 = D+1, r4 = 2*D */
{
r5 = B[k];
r1 = Init1 & r5;
A[k] = ((r5 >> 1) & CMask) | B[k-I] | (((A[k-DD] | B[k-S]) >>1) & r_NO_ERR) | r1 ;
}
if(A[D] & endpos) {
j++;
if(((AND == 1) && ((A[D*2] & endposition) == endposition)) || ((AND == 0) && (A[D*2] & endposition)) ^ INVERSE )
{
if(FILENAMEONLY) {
num_of_matched++;
printf("%s\n", CurrentFileName);
return; }
if(lasti < Max_record + num_read)
output(buffer, lasti, i-D_length-1, j);
}
lasti = i - D_length;
TRUNCATE = OFF;
for(k = D; k <= r4 ; k++) A[k] = B[k] = Init[0];
r1 = Init1 & B[D];
A[D] = (((B[D] >> 1) & CMask ) | r1) & D_Mask;
for(k = r3; k <= r4; k++) /* r3 = D+1, r4 = 2*D */
{
r5 = B[k];
r1 = Init1 & r5;
A[k] = ((r5 >> 1) & CMask) | B[k-I] | (((A[k-DD] | B[k-S]) >>1) & r_NO_ERR) | r1 ;
}
} /* end if (A[D]&endpos) */
CMask = Mask[buffer[i++]];
r1 = A[D] & Init1;
B[D] = ((A[D] >> 1) & CMask) | r1;
for(k = r3; k <= r4; k++)
{
r1 = A[k] & Init1;
B[k] = ((A[k] >> 1) & CMask) | A[k-I] | (((B[k-DD] | A[k-S]) >>1)&r_NO_ERR) | r1 ;
}
if(B[D] & endpos) {
j++;
if(((AND == 1) && ((B[r4] & endposition) == endposition)) || ((AND == 0) && (B[r4] & endposition)) ^ INVERSE )
{ if(FILENAMEONLY) {
num_of_matched++;
printf("%s\n", CurrentFileName);
return; }
if(lasti < Max_record + num_read)
output(buffer, lasti, i-D_length-1, j);
}
lasti = i-D_length;
TRUNCATE = OFF;
for(k=D; k <= r4; k++) A[k] = B[k] = Init[0];
r1 = Init1 & A[D];
B[D] = (((A[D] >> 1) & CMask ) | r1) & D_Mask;
for(k = r3; k <= r4; k++) /* r3 = D+1, r4 = 2*D */
{
r5 = A[k];
r1 = Init1 & r5;
B[k] = ((r5 >> 1) & CMask) | A[k-I] | (((B[k-DD] | A[k-S]) >>1) & r_NO_ERR) | r1 ;
}
} /* end if (B[D]&endpos) */
}
ResidueSize = Max_record + num_read - lasti;
if(ResidueSize > Max_record) {
ResidueSize = Max_record;
TRUNCATE = ON;
}
strncpy(buffer+Max_record-ResidueSize, buffer+lasti, ResidueSize);
lasti = Max_record - ResidueSize;
if(lasti < 0) lasti = 1;
if(num_read < BlockSize) lasti = Max_record;
}
return;
}