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reader.cpp
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Wed, Nov 13, 05:27

reader.cpp
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/* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
Copyright (2003) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the GNU General Public License.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
#include <stdio.h>
#include <string.h>
#include "reader.h"
#include "error.h"
using namespace LAMMPS_NS;
/* ---------------------------------------------------------------------- */
Reader::Reader(LAMMPS *lmp) : Pointers(lmp)
{
fp = NULL;
}
/* ----------------------------------------------------------------------
try to open given file
generic version for ASCII files that may be compressed
------------------------------------------------------------------------- */
void Reader::open_file(const char *file)
{
if (fp != NULL) close_file();
compressed = 0;
const char *suffix = file + strlen(file) - 3;
if (suffix > file && strcmp(suffix,".gz") == 0) compressed = 1;
if (!compressed) fp = fopen(file,"r");
else {
#ifdef LAMMPS_GZIP
char gunzip[1024];
sprintf(gunzip,"gzip -c -d %s",file);
#ifdef _WIN32
fp = _popen(gunzip,"rb");
#else
fp = popen(gunzip,"r");
#endif
#else
error->one(FLERR,"Cannot open gzipped file");
#endif
}
if (fp == NULL) {
char str[128];
sprintf(str,"Cannot open file %s",file);
error->one(FLERR,str);
}
}
/* ----------------------------------------------------------------------
close current file if open
generic version for ASCII files that may be compressed
------------------------------------------------------------------------- */
void Reader::close_file()
{
if (fp == NULL) return;
if (compressed) pclose(fp);
else fclose(fp);
fp = NULL;
}

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