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read_lenstable.c
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Sun, Jan 5, 21:33

read_lenstable.c
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/*this function will read a binary file containing gnfw slope (alpha),
x (r/rsc), kappa and dpl. These values will have to be rescaled
before being used by lenstool. The function will return the number
of complete entries made*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "wcs.h"
#include <dimension.h>
#include <structure.h>
extern lensdata *lens_table;
void read_lenstable()
{
long int i, tot_count;
char infile[200];
char *dir;
long int alphasteps, xsteps;
lensdata array_tmp[2]; // Read the first 2 rows of lenstable[]
FILE *inf;
// BUG: The lenstool.tab datafile only needs to exist in ONE place -
// preferably the table_src directory. lenstool needs to use environment
// variables for this!! Suggest:
dir = getenv("LENSTOOL_DIR");
if ( dir == NULL )
{
fprintf( stderr, "ERROR: LENSTOOL_DIR environment variable is not defined. Unable to find lenstool.tab file\n");
exit(-1);
}
strcpy(infile, dir);
strcat(infile, "/table_src/lenstool.tab");
inf = fopen(infile, "rb+");
if ( inf == NULL )
{
fprintf( stderr, "ERROR: Unable to find %s\n", infile);
exit(-1);
}
fprintf(stderr, "READ: lens_table binary file into array...");
//read in the first two rows (0:alpha,1:x) to find out how many more lines to read
fread(&array_tmp[0], sizeof(lensdata), 1, inf);
alphasteps = (long int)array_tmp[0].x_now;
fread(&array_tmp[1], sizeof(lensdata), 1, inf);
xsteps = (long int)array_tmp[1].x_now;
tot_count = xsteps * alphasteps + 2;
if (tot_count > ARRAY_SIZE)
{
fprintf(stderr, "\nREAD ERROR: lens_table, Need to increase output array size!!!\n");
exit(-1);
}
// Allocate lens_table
lens_table = (lensdata*) malloc( (unsigned int) tot_count * sizeof(lensdata) );
// Fill the first 2 rows of lens_table with array_tmp
memcpy( &lens_table[0], &array_tmp[0], sizeof(lensdata) );
memcpy( &lens_table[1], &array_tmp[1], sizeof(lensdata) );
for (i = 2; i < tot_count; i++)
fread(&lens_table[i], sizeof(lensdata), 1, inf);
fprintf(stderr, "done\n");
fprintf(stderr, "INFO: NFWg limits (alpha[%lf,%lf], r/rs[%lf,%lf])\n",
lens_table[2].alpha_now, lens_table[tot_count-1].alpha_now,
lens_table[2].x_now, lens_table[tot_count-1].x_now );
fclose(inf);
}

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