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Changed DIMAC cnf file parsing #16

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Merged
haz merged 1 commit into from
Apr 4, 2022
Merged

Changed DIMAC cnf file parsing #16

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130 changes: 56 additions & 74 deletions src/src_sharpSAT/MainSolver/InstanceGraph/InstanceGraph.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,8 @@
#include <math.h>
#include<fstream>
#include<stdio.h>
#include<limits>
#include<sstream>

CRunAnalyzer theRunAn;

Expand Down Expand Up @@ -615,13 +617,7 @@ bool CInstanceGraph::prep_CleanUpPool()

bool CInstanceGraph::createfromFile(const char* lpstrFileName)
{

const int BUF_SZ = 65536;
const int TOK_SZ = 255;

char buf[BUF_SZ];
char token[TOK_SZ];
unsigned int line = 0;
unsigned int nLine = 0;
unsigned int nVars, nCls;
int lit;
vector<int> litVec;
Expand All @@ -646,73 +642,59 @@ bool CInstanceGraph::createfromFile(const char* lpstrFileName)
fclose(filedesc);

ifstream inFile(lpstrFileName, ios::in);

// read the preamble of the cnf file
while (inFile.getline(buf, BUF_SZ))
{
line++;
if (buf[0] == 'c')
continue;
if (buf[0] == 'p')
{
if (sscanf(buf, "p cnf %d %d", &nVars, &nCls) < 2)
{
toERROUT("line "<<line<<": failed reading problem line \n");
exit(3);
}
break;
}
else
{
toERROUT("line"<<line<<": problem line expected "<<endl);
}
}
originalVarCount = nVars;
int i, j;
// now read the data
while (inFile.getline(buf, BUF_SZ))
{
line++;
i = 0;
j = 0;
if (buf[0] == 'c')
continue;
while (buf[i] != 0x0)
{

while (buf[i] != 0x0 && buf[i] != '-' && (buf[i] < '0' || buf[i]
> '9'))
i++;
if (buf[i] == 0x0) continue;
while (buf[i] == '-' || buf[i] >= '0' && buf[i] <= '9')
{
token[j] = buf[i];
i++;
j++;
}
token[j] = 0x0;
lit = atoi(token);
j = 0;
if (lit == 0) // end of clause
{
if (clauseLen > 0)
litVec.push_back(0);
clauseLen = 0;
}
else
{
clauseLen++;
litVec.push_back(lit);
}
}
}

if (!inFile.eof())
{
toERROUT(" CNF input: line too long");
}
inFile.close();
/// END FILE input
string line;
string nextWord;

// read the preamble of the cnf file
while(std::getline(inFile, line))
{
nLine++;
if (line.compare(0, 5, "p cnf") == 0)
{
std::stringstream linestream(line);
linestream >> nextWord; // eat 'p'
linestream >> nextWord; // eat 'cnf'
if(!(linestream >> nVars) || !(linestream >> nCls))
{
toERROUT("line "<<nLine<<": failed reading cnf header line, expected p cnf Vars Clauses"<<endl);
exit(3);
}
break;
}
else if (line[0] != 'c')
toERROUT("line " << nLine << ": problem line, expected comment c ... or p cnf Vars Clauses" << endl);
}

originalVarCount = nVars;
char firstChar;
// now read the data
while (inFile >> firstChar)
{
if(isdigit(firstChar) || firstChar == '-')
{
inFile.unget();
// parse clause (begins with (negative) digit)
while((inFile >> lit) && lit != 0)
{
clauseLen++;
litVec.push_back(lit);
}
if (clauseLen > 0)
litVec.push_back(0);
clauseLen = 0;
inFile.ignore(numeric_limits<streamsize>::max(), '\n'); // skip till next line
nLine++;
}
else if (!isspace(firstChar)) // if whitespace, we eat it instead
{
// no digit (or whitespace) so we skip the line
inFile.ignore(numeric_limits<streamsize>::max(),'\n');
nLine++;
}
}

inFile.close();
/// END FILE input


vector<int>::iterator it, jt, itEndCl;
Expand Down