fopen() is a directory, what must be changed?-CodePudding

im getting the fopen() is a directory and I am unable to locate my error,

it works perfectly with put and fgets. (Code That Works)

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

int main(void) // Use a valid prototype for main
{
  char path[256] = "/your/fixed/path/";
size_t len = strlen(path);

puts("Enter a file name:");
// Get the file name leaving room for the path
if (fgets(path   len, sizeof(path) - len, stdin))
    {
    // Strip the trailing new line
    path[strcspn(path, "\n")] = 0;
    }
    // Nothing to concat

    FILE *file = fopen(path, "w");

    // Always check the result of fopen
    if (file == NULL)
    {
        perror("fopen");
        exit(EXIT_FAILURE);
    }
    // Do your stuff ...
    fclose(file);
    return 0;
}

I want to use printf and scanf instead of puts and fgets, and when I use the below code I get the reply as fopen() is a directory

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

int main(void) // Use a valid prototype for main
{
  char path[256] = "./casestudy/";
size_t len = strlen(path);
  char *bt ="dd.txt";


// Get the file name leaving room for the path
if(path   len, sizeof(path) - len, bt)
    {
    // Strip the trailing new line
    path[strcspn(path, "\n")] = 0;
    }
    // Nothing to concat

    FILE *file = fopen(path, "w");

    // Always check the result of fopen
    if (file == NULL)
    {
        perror("fopen");
        exit(EXIT_FAILURE);
    }
    // Do your stuff ...
    fclose(file);
    return 0;
}

CodePudding user response：

You probably want something like this:

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

int main(int argc, char *argv[]) // using valid prototype for main
{
  char path[256] = "./casestudy/";

  puts("Enter the filename: ");

  // Ask for filename from the user
  char filename[256];
  fgets(filename, sizeof(filename), stdin);
  filename[strcspn(path, "\n")] = 0;  // remove trailing \n if any

  // concatenate user provided filename to the path
  strcat(path, filename);

  // now path contains the full path to the file
  printf("Full path is \"%s\".", path);

  // FILE *f = fopen(path, ....)
  // ...
}

Disclaimer: there is no checking for valid input, if the user provides a filename which is too long you'll get a buffer overflow. I let you deal with this as an exercise.