Agfdhyk

I am trying to read in the contents of a file using command line arguments to read the file and then store all contents of the file into a single array.

Keep in the mind, the file being read in is actually a matrix with the first row being an integer value designating the square size of the matrix and the following rows and columns being the matrix.

so far I have been able to dynamically allocate memory and then read the contents of the file using fgets. I am kind of stumped when it comes to storing the contents into a single array to access later. I tried using a double variable to hold the parsed contents of the 2nd while loop but when printed to the terminal it only gave me the last variable in the file.

I have attempted using strdup to make a copy of the string but am running into an error that says a value of type char cannot be stored in an entity of type char

here is my code.

If someone could help me, I would be very grateful.

#include<stdio.h>

#include<stdint.h>

#include<stdlib.h>

#include<string.h>



int main(int argc,char **argv){     //char **argv will be used to read the input file



    int i,j,k,l,m,nn;

    long size;

    double mat;

    char *buff;

    char n[100];

    char *file = argv[1];

    long len =0;

    int h =0;



    FILE *output;                   // need to declare the output file



    FILE *f =fopen(file, "rb+");    //utilize argv to read in file, will read file in as binary file to obtain ASCII

    fseek(f, 0L, SEEK_END);         //Want to determine the size of the file to create a buffer 

    size = ftell(f);                //Will seek to the end of the file, declare that position as the size

    rewind(f);                      //Will rewind to the beginning of the file

    buff = (char *)malloc(size);    //Declare the buffer size from fseek



    //Will read in and print out the contents of the file using fgets and printf



    while(fgets(buff,size - 1,f) != NULL){

        printf( "%sn", buff);



    }

    rewind(f);

    while(fscanf(f, "%lf", &mat) ==1){

        buff[h] = _strdup(n);

        h++;

    }



    printf("matrix stored is %cn",mat);

Here's an example:

/*

 * EXAMPLE FILE:

 *   3,3

 *   1,2,3

 *   4,5,6

 *   7,8,9

 *

 * EXAMPLE OUTPUT:

 *   #/rows=3, #/columns=3

 *   1.000000, 2.000000, 3.000000

 *   4.000000, 5.000000, 6.000000

 *   7.000000, 8.000000, 9.000000

 */

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <errno.h>



#define MAXLINE 100

#define DELIMITER ","



void print_matrix (int nrows, int ncols, double **mat) {

  int i, j;

  printf("#/rows=%d, #/columns=%dn", nrows, ncols);

  for (i=0; i < nrows; i++) {

    for (j=0; j < ncols-1; j++) {

      printf("%lf, ", mat[i][j]);

    }

    printf("%lfn", mat[i][j]);

  }

}



int main(int argc, char *argv) {



  FILE *fp = NULL;

  int iret = 1, n = 0, nrows, ncols;

  double **mat, d;

  char *s, line[MAXLINE], *endptr;

  int i, j;



  /* Read .csv filepath from cmd-line */

  if (argc < 2) {

    printf ("USAGE: app <fname>n");

    goto the_end;

  }



  /* Open file */

  if (!(fp = fopen (argv[1], "r"))) {

    printf ("File open(%s) failed: errno= %dn",

      argv[1], errno);

    goto the_end;

  }



  /* Read matrix dimensions */

  iret = fscanf(fp, "%d,%d", &ncols, &nrows);

  if (iret != 2) {

    printf ("Unable to read file dimensions, iret= %d, expected 2n",

      iret);

    goto the_end;

  }



  /* Flush the extraneous newline left in the read buffer after fscanf()... */

  fgetc(fp);



  /* Allocate space for our matrix */

  mat = (double **)malloc(sizeof(double *)*nrows);

  if (!mat) {

    printf ("Memory allocation error @matrix, errno=%d: exiting progamn",

      errno);

    goto the_end;

  }

  for (i=0; i < nrows; i++) {

    mat[i] = malloc(sizeof(double)*ncols);

    if (!mat[i]) {

      printf ("Memory allocation error @matrix[%d], errno=%d: exiting progamn",

        i,  errno);

      goto the_end;

    }

  }



  /* Populate the matrix */

  for (i=0; i < nrows; i++) {

    ++n;

    s = fgets(line, MAXLINE, fp);

    if (s == NULL) {

      printf ("fgets read error, line %d, errno=%d: exiting programn",

        n, errno);

      goto the_end;

    }

    s = strtok(line, DELIMITER);

    for (j=0; j < ncols; j++) {

      d = strtod(s, &endptr);

      if (s == endptr) {

        printf ("strtod(%s) conversion error, errno %d: exiting programn",

          s, errno);

        goto the_end;

      }

      mat[i][j] = d;

      s = strtok(NULL, DELIMITER);

    }

  }



  /* Print the matrix */

  print_matrix (nrows, ncols, mat);



  /* Set "OK" status */

  iret = 0;



the_end:

  if (fp)

    fclose(fp);

  printf("Done: status=%d (%s)n",

    iret,

    (iret == 0) ? "Status: OK" : "Status: FAIL");

  return iret;

}