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#include "FileUtils.hpp"
using namespace std;
bool FileExists(string &fileName) {
FILE *fp = fopen(fileName.c_str(),"r");
if( fp ) {
// exists
fclose(fp);
return true;
}
else {
return false;
}
}
void CriticalOpenRead(string &fileName, ifstream &file, std::ios::openmode mode) {
file.open(fileName.c_str(), mode | std::ios::in);
if (!file.good()) {
cerr << "Could not open file:" << fileName << endl;
exit(1);
}
}
int OpenRead(string &fileName, ifstream &file, std::ios::openmode mode) {
file.open(fileName.c_str(), mode | std::ios::in);
return file.good();
}
void CriticalOpenWrite(string &fileName, ofstream &file, std::ios::openmode mode) {
file.open(fileName.c_str(), mode | std::ios::out);
if (!file.good()) {
cerr << "Could not open file: " << fileName << endl;
exit(1);
}
}
int OpenWrite(string &fileName, ofstream &file, std::ios::openmode mode) {
file.open(fileName.c_str(), mode | std::ios::out);
return file.good();
}
int CountLinesInFile(string fileName) {
char* filePtr;
long fileSize;
int fileDes;
fileDes = open(fileName.c_str(), O_RDONLY);
fileSize = lseek(fileDes, 0, SEEK_END);
lseek(fileDes, 0, SEEK_SET);
filePtr = (char*) mmap(0, fileSize, PROT_READ, MAP_PRIVATE, fileDes, 0);
long pos;
int numLines = 0;
for (pos = 0; pos < fileSize; pos++, filePtr++) {
if (*filePtr == '\n') {
numLines++;
}
}
return numLines;
}
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