Lab4

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>

void createFile(const char *filename) {
    int fd = open(filename, O_CREAT | O_WRONLY, 0644);
    if (fd == -1) {
        perror("Error creating file");
        return;
    }
    printf("File '%s' created successfully!\n", filename);
    close(fd);
}

void deleteFile(const char *filename) {
    if (unlink(filename) == 0) {
        printf("File '%s' deleted successfully!\n", filename);
    } else {
        perror("Error deleting file");
    }
}

void renameFile(const char *oldname, const char *newname) {
    if (rename(oldname, newname) == 0) {
        printf("File renamed from '%s' to '%s' successfully!\n", oldname, newname);
    } else {
        perror("Error renaming file");
    }
}

void changePermissions(const char *filename, mode_t mode) {
    if (chmod(filename, mode) == 0) {
        printf("Permissions of '%s' changed successfully!\n", filename);
    } else {
        perror("Error changing file permissions");
    }
}

int main() {
    int choice;
    char filename[100], newname[100];
    mode_t mode;

    while (1) {
        printf("\nFile Operations Menu:\n");
        printf("1. Create File\n");
        printf("2. Delete File\n");
        printf("3. Rename File\n");
        printf("4. Change File Permissions\n");
        printf("5. Exit\n");
        printf("Enter your choice: ");
        scanf("%d", &choice);

        switch (choice) {
            case 1:
                printf("Enter filename to create: ");
                scanf("%s", filename);
                createFile(filename);
                break;
            case 2:
                printf("Enter filename to delete: ");
                scanf("%s", filename);
                deleteFile(filename);
                break;
            case 3:
                printf("Enter current filename: ");
                scanf("%s", filename);
                printf("Enter new filename: ");
                scanf("%s", newname);
                renameFile(filename, newname);
                break;
            case 4:
                printf("Enter filename to change permissions: ");
                scanf("%s", filename);
                printf("Enter new permissions (octal, e.g., 0644): ");
                scanf("%o", &mode);
                changePermissions(filename, mode);
                break;
            case 5:
                printf("Exiting...\n");
                exit(0);
            default:
                printf("Invalid choice! Please try again.\n");
        }
    }
    return 0;
}