CODEWITHSUNDEEP
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joaopfsilva
joaopfsilva

Reputation: 21

C language : passing info through a File .csv to a struct using linked list

I'm having some troubles passing the information of a .csv file to a struct using linked lists...

The file is like:

1,3.234,hello,f
3,4.2432,worldkind,o
.
.
.

My C Program:

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

#define MAX 50
typedef struct TP
{
    int key;
    //data
    int atomnum;
    float massnum;
    char nome[MAX+1];
    char sym[MAX+1];
    struct tableper *nseg;
    struct tableper *nant;
}tp;

tp* putmemory(tp *dbase1) //function to put data to struct
{
    FILE *fp1;
    char *token,ch,temp[MAX];
    int *tokenint,i,aux[MAX],in=-1,flag=0;
    char BUFFER[MAX],*aux2;
    tp *nv;

    if ((fp1 = fopen("TabelaPeriodica.csv","r")) == NULL)
        printf("File could not be opened \n");

    while(!feof(fp1))
    {
        while((ch=fgetc(fp1)) != '\r') 
        {
            temp[++in]=ch;
            if(ch == ',')
            {
                nv->key = ++i;
                token = strtok(temp[++i],",");
                nv->atomnum = token;
                token = strtok(NULL,",");
                nv->massnum = atof(token);
                token = strtok(NULL,",");
                strcpy(nv->nome,token);
                token = strtok(NULL,",");
                strcpy(nv->sym,token);
                free(nv);
            }       
        }
    }
}
int main()
{
    tp *dbase1;
    putmemory(dbase1);
    return 0;
}

My problems are:

  1. pass a vector of chars to a vector of string
  2. read each line and save in struct
  3. each iteration save nv(new_node) to struct using linked list

Upvotes: 1

Views: 972

Answers (2)

pmg
pmg

Reputation: 108938

You need to allocate memory for nv.

In your current code, nv is an uninitialized pointer. You can't use it just like that.

Also you have a free(nv) in your code and no corresponding nv = malloc(sizeof *nv); or similar

Upvotes: 1

Mario The Spoon
Mario The Spoon

Reputation: 4859

one of the many issues I spot is that you never allocate memory for nv... Also I would use fgets to read a whole line and then use strtok on it

again, you have to allocate nv, and then set dbase1 to it, so you build up a linked list

Upvotes: 1

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