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ASEARCH.C
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C/C++ Source or Header
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1992-01-23
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11KB
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314 lines
/* Copyright (c) 1991 Sun Wu and Udi Manber. All Rights Reserved. */
#include "agrep.h"
extern unsigned Init1, Init[], Mask[], endposition, D_endpos, AND, NO_ERR_MASK;
extern int DELIMITER, FILENAMEONLY, INVERSE;
extern CHAR CurrentFileName[];
extern int I, num_of_matched, TRUNCATE;
asearch(old_D_pat, text, D)
CHAR old_D_pat[]; int text; register unsigned D;
{
register unsigned i, c, r1, r2, CMask, r_NO_ERR, r_Init1;
register unsigned A0, B0, A1, B1, endpos;
unsigned A2, B2, A3, B3, A4, B4;
unsigned A[MaxError+1], B[MaxError+1];
unsigned D_Mask;
unsigned end;
int D_length, FIRSTROUND, ResidueSize, lasti, l, k, buffer_end, j=0;
int printout_end;
CHAR buffer[2*Max_record+1];
if (I == 0) Init1 = 037777777777;
if(D > 4) {
asearch0(old_D_pat, text, D);
return; }
D_length = strlen(old_D_pat);
buffer[Max_record-1] = '\n';
D_Mask = D_endpos;
for ( i=1; i<D_length; i++) D_Mask = (D_Mask<<1) | D_Mask;
D_Mask = ~D_Mask;
r_Init1 = Init1; /* put Init1 in register */
r_NO_ERR = NO_ERR_MASK; /* put NO_ERR_MASK in register */
endpos = D_endpos;
FIRSTROUND = ON;
A0 = B0 = A1 = B1 = A2 = B2 = A3 = B3 = A4 = B4 = Init[0];
for(k=0; k<=D; k++) A[k] = B[k] = Init[0];
lasti = Max_record;
while ((l = fill_buf(text, buffer + Max_record, Max_record)) > 0)
{ i = Max_record; end = Max_record + l ;
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 = OFF; }
if (l < BlockSize) {
strncpy(buffer+end, old_D_pat, D_length);
buffer[end+D_length] = '\0';
end = end + D_length; }
while (i < end )
{
c = buffer[i];
CMask = Mask[c];
r1 = r_Init1 & B0;
A0 = ((B0 >>1 ) & CMask) | r1;
r1 = r_Init1 & B1;
r2 = B0 | (((A0 | B0) >> 1) & r_NO_ERR);
A1 = ((B1 >>1 ) & CMask) | r2 | r1 ;
if(D == 1) goto Nextchar;
r1 = r_Init1 & B2;
r2 = B1 | (((A1 | B1) >> 1) & r_NO_ERR);
A2 = ((B2 >>1 ) & CMask) | r2 | r1 ;
if(D == 2) goto Nextchar;
r1 = r_Init1 & B3;
r2 = B2 | (((A2 | B2) >> 1) & r_NO_ERR);
A3 = ((B3 >>1 ) & CMask) | r2 | r1 ;
if(D == 3) goto Nextchar;
r1 = r_Init1 & B4;
r2 = B3 | (((A3 | B3) >> 1) & r_NO_ERR);
A4 = ((B4 >>1 ) & CMask) | r2 | r1 ;
if(D == 4) goto Nextchar;
Nextchar: i=i+1;
if(A0 & endpos) {
j++; r1 = A0;
if ( D == 1) r1 = A1;
if ( D == 2) r1 = A2;
if ( D == 3) r1 = A3;
if ( D == 4) r1 = A4;
if(((AND == 1) && ((r1 & endposition) == endposition)) || ((AND == 0) && (r1 & endposition)) ^ INVERSE )
{
if(FILENAMEONLY) {
num_of_matched++;
printf("%s\n", CurrentFileName);
return; }
printout_end = i - D_length - 1;
if(!(lasti >= Max_record + l - 1))
output(buffer, lasti, printout_end, j);
}
lasti = i - D_length; /* point to starting position of D_pat */
TRUNCATE = OFF;
for(k=0; k<= D; k++) {
B[k] = Init[0];
}
r1 = B[0] & Init1;
A[0] = (((B[0]>>1) & CMask) | r1) & D_Mask;
for(k=1; k<= D; k++) {
r1 = Init1 & B[k];
r2 = B[k-1] | (((A[k-1] | B[k-1])>>1)&r_NO_ERR);
A[k] = (((B[k]>>1)&CMask) | r1 | r2) ;
}
A0 = A[0]; B0 = B[0]; A1 = A[1]; B1 = B[1]; A2 = A[2]; B2 = B[2];
A3 = A[3]; B3 = B[3]; A4 = A[4]; B4 = B[4];
}
c = buffer[i];
CMask = Mask[c];
r1 = r_Init1 & A0;
B0 = ((A0 >> 1 ) & CMask) | r1;
#ifdef DEBUG
printf("Mask = %o, B0 = %o\n", CMask, B0);
#endif
r1 = r_Init1 & A1;
r2 = A0 | (((A0 | B0) >> 1) & r_NO_ERR);
B1 = ((A1 >>1 ) & CMask) | r2 | r1 ;
if(D == 1) goto Nextchar1;
r1 = r_Init1 & A2;
r2 = A1 | (((A1 | B1) >> 1) & r_NO_ERR);
B2 = ((A2 >>1 ) & CMask) | r2 | r1 ;
if(D == 2) goto Nextchar1;
r1 = r_Init1 & A3;
r2 = A2 | (((A2 | B2) >> 1) & r_NO_ERR);
B3 = ((A3 >>1 ) & CMask) | r2 | r1 ;
if(D == 3) goto Nextchar1;
r1 = r_Init1 & A4;
r2 = A3 | (((A3 | B3) >> 1) & r_NO_ERR);
B4 = ((A4 >>1 ) & CMask) | r2 | r1 ;
if(D == 4) goto Nextchar1;
Nextchar1: i=i+1;
if(B0 & endpos) {
j++; r1 = B0;
if ( D == 1) r1 = B1;
if ( D == 2) r1 = B2;
if ( D == 3) r1 = B3;
if ( D == 4) r1 = B4;
if(((AND == 1) && ((r1 & endposition) == endposition)) || ((AND == 0) && (r1 & endposition)) ^ INVERSE )
{
if(FILENAMEONLY) {
num_of_matched++;
printf("%s\n", CurrentFileName);
return; }
printout_end = i - D_length -1 ;
if(!(lasti >= Max_record + l - 1))
output(buffer, lasti, printout_end, j);
}
lasti = i - D_length ;
TRUNCATE = OFF;
for(k=0; k<= D; k++) {
A[k] = Init[0];
}
r1 = A[0] & Init1;
B[0] = (((A[0]>>1)&CMask) | r1) & D_Mask;
for(k=1; k<= D; k++) {
r1 = Init1 & A[k];
r2 = A[k-1] | (((A[k-1] | B[k-1])>>1)&r_NO_ERR);
B[k] = (((A[k]>>1)&CMask) | r1 | r2) ;
}
A0 = A[0]; B0 = B[0]; A1 = A[1]; B1 = B[1]; A2 = A[2]; B2 = B[2];
A3 = A[3]; B3 = B[3]; A4 = A[4]; B4 = B[4];
}
}
if(l < BlockSize) {
lasti = Max_record ;
}
else {
ResidueSize = Max_record + l - 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;
}
}
return;
}
asearch0(old_D_pat, text, D)
CHAR old_D_pat[]; int text; register unsigned D;
{
register unsigned i, c, r1, r2, r3, CMask, r_NO_ERR, r_Init1, end, endpos;
unsigned A[MaxError+2], B[MaxError+2];
unsigned D_Mask;
int D_length, FIRSTROUND, ResidueSize, lasti, l, k, buffer_end, j=0;
int printout_end;
CHAR buffer[BlockSize+Max_record+1];
D_length = strlen(old_D_pat);
buffer[Max_record-1] = '\n';
D_Mask = D_endpos;
for ( i=1; i<D_length; i++) D_Mask = (D_Mask<<1) | D_Mask;
D_Mask = ~D_Mask;
r_Init1 = Init1; /* put Init1 in register */
r_NO_ERR = NO_ERR_MASK; /* put NO_ERR_MASK in register */
endpos = D_endpos;
FIRSTROUND = ON;
for(k=0; k<=D; k++) A[k] = B[k] = Init[0];
lasti = Max_record;
while ((l = fill_buf(text, buffer + Max_record, Max_record)) > 0)
{ i = Max_record; end = Max_record + l ;
if (FIRSTROUND) {
i = Max_record - 1;
FIRSTROUND = OFF; }
if (l < BlockSize) {
strncpy(buffer+end, old_D_pat, D_length);
buffer[end+D_length] = '\0';
end = end + D_length; }
while (i < end )
{
c = buffer[i++];
CMask = Mask[c];
r1 = B[0] & r_Init1;
A[0] = (((B[0] >> 1)) & CMask | r1 ) ;
for(k=1; k<=D; k++) {
r1 = r_Init1 & B[k];
r2 = B[k-1] | (((A[k-1]|B[k-1])>>1) & r_NO_ERR);
A[k] = ((B[k] >> 1) & CMask) | r2 | r1;
}
if(A[0] & endpos) {
j++;
r1 = A[D];
if(((AND == 1) && ((r1 & endposition) == endposition)) || ((AND == 0) && (r1 & endposition)) ^ INVERSE )
{
if(FILENAMEONLY) {
num_of_matched++;
printf("%s\n", CurrentFileName);
return; }
printout_end = i - D_length - 1;
if(!(lasti >= Max_record + l - 1))
output(buffer, lasti, printout_end, j);
}
lasti = i - D_length; /* point to starting position of D_pat */
for(k=0; k<= D; k++) {
B[k] = Init[0];
}
r1 = B[0] & r_Init1;
A[0] = (((B[0]>>1) & CMask) | r1) & D_Mask;
for(k=1; k<= D; k++) {
r1 = Init1 & B[k];
r2 = B[k-1] | (((A[k-1] | B[k-1])>>1)&r_NO_ERR);
A[k] = (((B[k]>>1)&CMask) | r1 | r2) ;
}
}
c = buffer[i++];
CMask = Mask[c];
r1 = r_Init1 & A[0];
B[0] = ((A[0] >> 1 ) & CMask) | r1;
for(k=1; k<=D; k++) {
r1 = r_Init1 & A[k];
r2 = A[k-1] | (((A[k-1]|B[k-1])>>1) & r_NO_ERR);
B[k] = ((A[k] >> 1) & CMask) | r2 | r1;
}
if(B[0] & endpos) {
j++;
r1 = B[D];
if(((AND == 1) && ((r1 & endposition) == endposition)) || ((AND == 0) && (r1 & endposition)) ^ INVERSE )
{
if(FILENAMEONLY) {
num_of_matched++;
printf("%s\n", CurrentFileName);
return; }
printout_end = i - D_length -1 ;
if(!(lasti >= Max_record + l - 1))
output(buffer, lasti, printout_end, j);
}
lasti = i - D_length ;
for(k=0; k<= D; k++) {
A[k] = Init[0];
}
r1 = A[0] & r_Init1;
B[0] = (((A[0]>>1)&CMask) | r1) & D_Mask;
for(k=1; k<= D; k++) {
r1 = r_Init1 & A[k];
r2 = A[k-1] | (((A[k-1] | B[k-1])>>1)&r_NO_ERR);
B[k] = (((A[k]>>1)&CMask) | r1 | r2) ;
}
}
}
if(l < BlockSize) {
lasti = Max_record;
}
else {
ResidueSize = Max_record + l - 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;
}
}
return;
}
/*
fill_buf(fd, buf, record_size)
int fd, record_size; unsigned char *buf;
{
int num_read=1;
int total_read=0;
while(total_read < record_size && num_read > 0) {
num_read = read(fd, buf+total_read, 4096);
total_read = total_read + num_read;
}
return(total_read);
}
*/