config_handle.c

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <stdbool.h>
#include <errno.h>
#include <ctype.h>
#include <limits.h>
 
#include "../include/var_struc.h"
 
/*
 * To realize cross-platform programming.
 * ACCESS: Determine access permissions for files or folders.
 */
#ifdef _WIN32
#include <io.h>
/*
 * m=0: Test for existence.
 * m=2: Test for write permission.
 * m=4: Test for read permission.
 */
#define ACCESS(a,m) _access((a),(m))
#elif __linux__
#include <unistd.h>
#define ACCESS(a,m) access((a),(m))
#endif
 
 
static void config_check(void)
{
    const int dim = (int)config[0];
    printf("  dimension\t= %d\n", dim);
 
    // Maximum number of time steps
    if(isfinite(config[1]) && config[1] >= 0.0)
    {
        config[5] = isfinite(config[5]) ? config[5] : (double)INT_MAX;
        printf("  total time\t= %g\n", config[1]);
    }
    else if(!isfinite(config[5]))
    {
        fprintf(stderr, "The total time or the maximum number of time steps must be setted properly!\n");
        exit(2);
    }
    else
    {
        config[1] = INFINITY;
        if(isfinite(config[16]))
        {
            printf("  total time\t= %g * %d = %g\n", config[16], (int)config[5], config[16]*(int)config[5]);
            printf("  delta_t\t= %g\n", config[16]);
        }
    }
    printf("  time step\t= %d\n", (int)config[5]);
        
    if(isinf(config[4]))
    config[4] = EPS;
    double eps = config[4];
    if(eps < 0.0 || eps > 0.01)
    {
        fprintf(stderr, "eps(%f) should in (0, 0.01)!\n", eps);
        exit(2);
    }
    printf("  eps\t\t= %g\n", eps);
 
    if(isinf(config[6]))
    config[6] = 1.4;    
    else if(config[6] < 1.0 + eps)
    {
        fprintf(stderr, "The constant of the perfect gas(%f) should be larger than 1.0!\n", config[6]);
        exit(2);
    }
    printf("  gamma\t\t= %g\n", config[6]);
 
    if (isinf(config[7]))
    {
        switch(dim)
        {
        case 1:
            config[7] = 0.9;  break;
        case 2:
            config[7] = 0.45; break;
        }
    }
    else if(config[7] > 1.0 - eps)
    {
        fprintf(stderr, "The CFL number(%f) should be smaller than 1.0.\n", config[7]);
        exit(2);
    }
    printf("  CFL number\t= %g\n", config[7]);
 
    if(isinf(config[41]))
    config[41] = 1.9;
    else if(config[41] < -eps || config[41] > 2.0)
    {
        fprintf(stderr, "The parameter in minmod limiter(%f) should in [0, 2)!\n", config[41]);
        exit(2);
    }
  
    if(isinf(config[110]))
    config[110] = 0.72; 
    else if(config[110] < eps)
    {
        fprintf(stderr, "The specific heat at constant volume(%f) should be larger than 0.0!\n", config[110]);
        exit(2);
    }
 
    // Specie number
    config[2] = isfinite(config[2]) ? config[2] : (double)1;    
    // Coordinate framework (EUL/LAG/ALE)
    config[8] = isfinite(config[8]) ? config[8] : (double)0;
    // Reconstruction (prim_var/cons_var)
    config[31] = isfinite(config[31]) ? config[31] : (double)0;
    // Dimensional splitting
    config[33] = isfinite(config[33]) ? config[31] : (double)false;
    // Parameter α in minmod limiter
    config[41] = isfinite(config[41]) ? config[41] : 1.9;
    // v_fix
    config[61] = isfinite(config[61]) ? config[61] : (double)false;
    // offset_x
    config[210] = isfinite(config[210]) ? config[210] : 0.0;
    // offset_y
    config[211] = isfinite(config[211]) ? config[211] : 0.0;
    // offset_z
    config[212] = isfinite(config[212]) ? config[212] : 0.0;
}
 
static int config_read(FILE * fp)
{   
    char one_line[200]; // String to store one line.
    char *endptr;
    double tmp;
    int i, line_num = 1; // Index of config[*], line number.
 
    while (fgets(one_line, sizeof(one_line), fp) != NULL)
        {
            // A line that doesn't begin with digits is a comment.
            i =strtol(one_line, &endptr, 10);
            for ( ; isspace(*endptr); endptr++) ;
 
            // If the value of config[i] doesn't exit, it is 0 by default.
            if (0 < i && i < N_CONF)
                {
                    errno = 0;
                    tmp = strtod(endptr, NULL);
                    if(errno == ERANGE)
                        {
                        fprintf(stderr, "Value range error of %d-th configuration in line %d of configuration file!\n", i, line_num);
                        return 1;
                        }
                    else if(isinf(config[i]))
                        printf("%3d-th configuration: %g\n", i, config[i] = tmp);
                    else if(fabs(config[i] - tmp) > EPS)
                        printf("%3d-th configuration is repeatedly assigned with %g and %g(abandon)!\n", i, config[i], tmp);
                }
            else if (i != 0 || (*endptr != '#' && *endptr != '\0'))
                fprintf(stderr, "Warning: unknown row occurrs in line %d of configuration file!\n", line_num);
            line_num++;
        }
    if (ferror(fp))
        {
            fprintf(stderr, "Read error occurrs in configuration file!\n");
            return 0;
        }
    return 1;
}
 
 
void configurate(const char * add_in)
{
    FILE * fp_data;
    char add[FILENAME_MAX+40];
    strcpy(add, add_in);
    strcat(add, "config.txt");
    
  // Open the configuration data file.
  if((fp_data = fopen(add, "r")) == NULL)
      {
      strcpy(add, add_in);
      strcat(add, "config.dat");
      }
  if((fp_data = fopen(add, "r")) == NULL)
      {
      printf("Cannot open configuration data file!\n");
      exit(1);
      }
 
  // Read the configuration data file.
  if(config_read(fp_data) == 0)
      {
      fclose(fp_data);
      exit(2);
      }
  fclose(fp_data);
 
  printf("Configurated:\n");
  // Check the configuration data.
  config_check();
}
 
 
void config_write(const char * add_out, const double * cpu_time, const char * name)
{
    char file_data[FILENAME_MAX+40];
    const int dim = (int)config[0];
    FILE * fp_write;
 
//======================Write Log File============================
  strcpy(file_data, add_out);
  strcat(file_data, "/log");
  strcat(file_data, ".dat");
  if((fp_write = fopen(file_data, "w")) == NULL)
  {
    printf("Cannot open log output file!\n");
    exit(1);
  }
 
  fprintf(fp_write, "%s is initialized with %d grids.\n\n", name, (int)config[3]);
  fprintf(fp_write, "Configurated:\n");
  fprintf(fp_write, "dim\t\t= %d\n", dim);
  if(isfinite(config[1]))
      fprintf(fp_write, "t_all\t= %d\n", (int)config[1]);
  else if(isfinite(config[16]))
      fprintf(fp_write, "tau\t\t= %g\n", config[16]);
  fprintf(fp_write, "eps\t\t= %g\n", config[4]);
  fprintf(fp_write, "gamma\t= %g\n", config[6]);
  fprintf(fp_write, "CFL\t\t= %g\n", config[7]);
  fprintf(fp_write, "h\t\t= %g\n", config[10]);
  fprintf(fp_write, "bond\t= %d\n", (int)config[17]);
  if(dim == 2)
      {
      fprintf(fp_write, "h_y\t\t= %g\n", config[11]);
      fprintf(fp_write, "bond_y\t= %d\n", (int)config[18]);
      }
  fprintf(fp_write, "\nA total of %d time steps are computed.\n", (int)config[5]);
  /*
  double * sum = calloc(N, sizeof(double));
  sum[0] = 0.0;
  fprintf(fp_write, "CPU time for each step:");
  for(k = 1; k < N; ++k)
  {
    fprintf(fp_write, "%.18f  ", cpu_time[k]);
    sum[k] = sum[k-1] + cpu_time[k];
  }
  fprintf(fp_write, "\nTotal CPU time at each step:");
  for(k = 1; k < N; ++k)
    fprintf(fp_write, "%.18f  ", sum[k]);
  free(sum);
  sum = NULL;
  */
  fclose(fp_write);
}