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ReadCarFile.c
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Sat, Aug 17, 07:50

ReadCarFile.c
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/*
* This function opens the .car file and extracts coordinate information
* into the atoms Atom structure
*/
#include "Msi2LMP2.h"
void ReadCarFile(void)
{
char line[MAX_LINE_LENGTH]; /* Stores lines as they are read in */
int k,m,n; /* counters */
int skip; /* lines to skip at beginning of file */
double lowest, highest; /* temp coordinate finding variables */
double total_q;
/* Open .car file for reading */
sprintf(line,"%s.car",rootname);
if (pflag > 0) fprintf(stderr," Reading car file: %s\n",line);
if( (CarF = fopen(line,"r")) == NULL ) {
fprintf(stderr,"Cannot open %s\n",line);
exit(2);
}
/* Determine Number of molecules & atoms */
rewind(CarF);
no_molecules = -1; /* Set to -1 because counter will be incremented an
extra time at the end of the file */
fgets(line,MAX_LINE_LENGTH,CarF); /* Read header line */
/* Check for periodicity, if present, read cell constants */
if( strncmp(fgets(line,MAX_LINE_LENGTH,CarF),"PBC=ON",6) == 0) {
periodic = 1;
skip = 5; /* Data starts 5 lines from beginning of file */
fgets(line,MAX_LINE_LENGTH,CarF); /* Comment line */
fgets(line,MAX_LINE_LENGTH,CarF); /* Date stamp */
fscanf(CarF,"%*s %lf %lf %lf %lf %lf %lf %*s",
&pbc[0],&pbc[1],&pbc[2],&pbc[3],&pbc[4],&pbc[5]);
if(pbc[3] != 90.0 || pbc[4] != 90.0 || pbc[5] != 90.0) {
fprintf(stderr,"The system is not rectangular- LAMMPS can't handle it!!");
exit(2);
}
}
else {
periodic = 0;
skip = 4;
if (pflag > 1) {
fprintf(stderr," %s is not a periodic system\n", rootname);
fprintf(stderr," Assigning cell parameters based on coordinates\n");
}
fgets(line,MAX_LINE_LENGTH, CarF); /* Comment line */
fgets(line,MAX_LINE_LENGTH, CarF); /* Date Stamp */
}
/* First pass through file -- Count molecules */
while(fgets(line,MAX_LINE_LENGTH,CarF) != NULL )
if( strncmp(line,"end",3) == 0 )
no_molecules++;
/* Allocate space to keep track of the number of atoms within a molecule */
no_atoms = (int *) calloc(no_molecules,sizeof(int));
if ( no_atoms == NULL ) {
fprintf(stderr,"Could not allocate memory for no_atoms\n");
exit(2);
}
/* Second pass through file -- Count atoms */
rewind(CarF);
for(n=0; n < skip; n++) /* Skip beginning lines */
fgets(line,MAX_LINE_LENGTH,CarF);
for(n=0; n < no_molecules; n++)
while( strncmp(fgets(line,MAX_LINE_LENGTH,CarF),"end",3) )
no_atoms[n]++;
for( total_no_atoms=0, n=0; n < no_molecules; n++ )
total_no_atoms += no_atoms[n];
molecule = (struct MoleculeList *) calloc(no_molecules,
sizeof(struct MoleculeList));
if (molecule == NULL) {
fprintf(stderr,"Unable to allocate memory for molecule structure\n");
exit(2);
}
molecule[0].start = 0;
molecule[0].end = no_atoms[0];
for (n=1; n < no_molecules; n++) {
molecule[n].start = molecule[n-1].end;
molecule[n].end = molecule[n].start + no_atoms[n];
}
/* Allocate space for atoms Atom structures */
atoms = (struct Atom *) calloc(total_no_atoms,sizeof(struct Atom));
if( atoms == NULL ) {
fprintf(stderr,"Could not allocate memory for AtomList\n");
exit(2);
}
/* Third pass through file -- Read+Parse Car File */
rewind(CarF);
for(n=0; n < skip; n++)
fgets(line,MAX_LINE_LENGTH,CarF);
for(m=0; m < no_molecules; m++) {
for(k=molecule[m].start; k <
molecule[m].end; k++) {
atoms[k].molecule = m;
atoms[k].no = k;
fscanf(CarF,"%s %lf %lf %lf %*s %*s %s %s %f",
atoms[k].name,
&(atoms[k].x[0]),
&(atoms[k].x[1]),
&(atoms[k].x[2]),
atoms[k].potential,
atoms[k].element,
&(atoms[k].q));
}
fgets(line,MAX_LINE_LENGTH,CarF);
fgets(line,MAX_LINE_LENGTH,CarF);
} /* End m (molecule) loop */
for (total_q=0.0,k=0; k < total_no_atoms; k++)
total_q += atoms[k].q;
if (pflag > 1) {
fprintf(stderr," There are %d atoms in %d molecules in this file\n",
total_no_atoms,no_molecules);
fprintf(stderr," The total charge in the system is %7.3f.\n\n",total_q);
}
/* Search coordinates to find lowest and highest for x, y, and z */
if (periodic == 0) {
for ( k = 0; k < 3; k++) {
lowest = atoms[0].x[k];
highest = atoms[0].x[k];
for ( m = 1; m < total_no_atoms; m++) {
if (atoms[m].x[k] < lowest) lowest = atoms[m].x[k];
if (atoms[m].x[k] > highest) highest = atoms[m].x[k];
}
pbc[k] = lowest;
pbc[k+3] = highest;
}
}
else {
for (k=0; k < 3; k++) {
pbc[k+3] = pbc[k];
pbc[k] = 0.0;
}
}
/* Close .car file */
if (fclose(CarF) !=0) {
fprintf(stderr,"Error closing %s.car\n", rootname);
exit(1);
}
}
/* End ReadCarFile() */

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