Passing a string as argument to fgets

Hello there,

I'm trying to prompt the user for a file name (from main.c) and then pass that name as an argument to the fgets function (in file_op.c).

In main.c, I did the following:

Code:

char *file = "testfile.txt";
read_file(file);

In file_op.c:

Code:

void read_file(char * name) {
FILE *file = fopen(name, "r");
if (file == NULL) {
perror("Impossible to open file.");
exit(EXIT_FAILURE);
    }
    
    char *line;

    while (fgets(line, 100, file) != NULL) {
        printf("%s", line);
    }
}

I'm getting a error in Netbeans about accessing memory.
Could you guys help me? I'm not very familiar with this fgets function and all the examples I've found were not very helpful.

Thanks a lot in advance.

You declare a pointer to char named line, but did not allocate any memory for the string, and did not even initialise the pointer.

The variable "line" is not pointing to any valid memory.

char line[100];

would be a much better way to go.

That did it, thanks a lot both of you!