How can i read a csv file in C?

Question

I need to reed a csv file in C. I made a struct like this:

typedef struct Node{
  void** elem;
  List* next;
}List;

If I dont'know what's in csv file, how can I read the elements? They can be different in the same record. A sample of a record is this: 12,ciao,45,2.4 Where i have a different type in the same record. I saw fget function yet, but it return a char* or char... I would like something more generic because I don't know what there's in the record. I will use this struct with sorting algorithm. In sorting algorithm i have a compare function like this

typedef int (*CompareFunction)(void*, void*);`

so if i can read void* on csv file and than put the element on the struct this wuold make easy the compare function.

Too broad as stated. Show us your efforts, we will try to help you on problems... — LPs, Apr 12 '17 at 10:22
[This SO question](http://stackoverflow.com/questions/12911299/read-csv-file-in-c) can give you a hand. — LPs, Apr 12 '17 at 10:24
Possible duplicate of [Parse CSV file in C](http://stackoverflow.com/questions/14115529/parse-csv-file-in-c) — Erich Kitzmueller, Apr 12 '17 at 10:25

score 0 · Accepted Answer · answered Apr 12 '17 at 10:25

0

you can use a lot of function

read function

fgets function as you said

of course you don't know the content of your file but using a char * is the best solution

in both cases you will use a char * because it's the best way to read your file; and can convert your data to an other type really easily

for example if you read a number in your file, then you can convert it to an integer using atoi for example

answered Apr 12 '17 at 10:25

RomMer

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Ok, thank's! I was hoping there was a function like fget it couldn't returns me a char* but a generic void*. – Enrico Arnaudo Apr 12 '17 at 10:40
then you can use read which takes a void * as buffer but it's, i think easiest, to use a simple char * depend of what you want to do then @EnricoArnaudo – RomMer Apr 12 '17 at 10:42
I would like to read the elements in csv, insert elements in the struct and then using sorting algorithm to ordered the struct. – Enrico Arnaudo Apr 12 '17 at 10:55
In the sort algorithm my compare function is: typedef int (CompareFunction)(void, void); the function and the elem are pointer – Enrico Arnaudo Apr 12 '17 at 11:29
The read() functions returns the number of byte read, how can i use this in my case? – Enrico Arnaudo Apr 12 '17 at 11:38
@EnricoArnaudo it takes a pointer as second parameter, it's your buffer; read will write the data in this buffer – RomMer Apr 12 '17 at 11:44
Ok, i see now an example, I understood what buffer return. It took me a while but I understood. – Enrico Arnaudo Apr 12 '17 at 11:55
But if I don't know the size of my file, what can I put on count? Insert an approximate number is not a good solution – Enrico Arnaudo Apr 12 '17 at 11:57
Is there any function in C that determin the size of a file? – Enrico Arnaudo Apr 12 '17 at 12:06

How can i read a csv file in C?

1 Answers1