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fsetpos()(set file position) in C

In this article, we will discuss the difference between the fsetpos() function in C++ with its syntax and examples.

What is fsetpos() function?

The C programming language has a function called fsetpos() that can be used to set the file position indicator of a specific file stream. It is commonly utilized for random access file operations and is a component of the Standard I/O Library.

Syntax of fsetpos():

It has the following syntax:

int fsetpos(FILE *stream, const fpos_t *pos)

Parameters:

  • stream: It is a reference to the stream's corresponding FILE object. Either a file opened with fopen() or one obtained from stdin, stdout, or stderr should be associated with it.
  • pos: The file position indicator is represented by a pointer to an object of type fpos_t. This opaque data type is a representation of the file position and can store all the data required to restore the file position.

Return Type:

  • The function fsetpos() returns zero if the operation is successful.
  • In the event of an error, a non-zero value is returned.

Example 1:

Let's take an example to illustrate the fsetpos() function in C.

#include <stdio.h>

int main()

{

// File pointer

FILE* fp;

// Variable to store file position

fpos_t position;

// Open or create a file in write and read mode

fp = fopen("example.txt", "w+");

// Get current file position and store it

fgetpos(fp, &position);

// Write "Programming is fun!" to the file

fputs("Programming is fun!", fp);

// Set file position back to the stored position

fsetpos(fp, &position);

// Write "C programming" to the file from the restored position

fputs("C programming", fp);

// Setting file pointer position back to the stored position

fsetpos(fp, &position);

// Storing data stored in the file

char arr[50];

fgets(arr, 18, fp);

// Printing output

puts(arr);

// Close the file

fclose(fp);

return 0;

}

Output:

C programmings fu

Explanation:

  • The first line of the file says, "Programming is fun!"
  • fgetpos() is used to store the file position.
  • The file is written with "C programming" from the position that was restored. Part of the old content is replaced by the new content because it is shorter than the original.
  • The stored position becomes the new file position.
  • fgets() is used to read the first 18 characters (including the overwritten portion).
  • The read content "Programming is fu" is printed using the puts() function.

Example 2:

Let's take another example to illustrate the fsetpos() function in C.

#include <stdio.h>

int main()

{

// File pointer

FILE* fp;

// Variable to store file position

fpos_t position;

// Open or create a file in write and read mode

fp = fopen("example.txt", "w+");

// Get current file position and store it

fgetpos(fp, &position);

// Write "OpenAI is amazing!" to the file

fputs("JAVA is amazing!", fp);

// Set file position back to the stored position

fsetpos(fp, &position);

// Write "ChatGPT is powerful" to the file from the restored position

fputs("Javatpoint is application", fp);

// Setting file pointer position back to the stored position

fsetpos(fp, &position);

// Storing data stored in the file

char arr[50];

fgets(arr, 28, fp);

// Printing output

puts(arr);

// Close the file

fclose(fp);

return 0;

}

Output:

Javatpoint is application

Example 3:

Let's take another example to illustrate the fsetpos() function in C.

#include <stdio.h>

int main()

{

// File pointer

FILE* fp;

// Variable to store file position

fpos_t position;

// Open or create a file in binary write and read mode

fp = fopen("numbers.bin", "wb+");

if (fp == NULL) {

perror("Error opening file");

return 1;

}

// Write integers to the file

int numbers[] = {42, 123, 789, 456, 999};

fwrite(numbers, sizeof(int), sizeof(numbers) / sizeof(int), fp);

// Get current file position and store it

fgetpos(fp, &position);

// Set file position back to the stored position

fsetpos(fp, &position);

// Read integers from the file

int readNumbers[5];

fread(readNumbers, sizeof(int), sizeof(readNumbers) / sizeof(int), fp);

// Print the read integers

printf("Read numbers from the file: ");

for (int i = 0; i < sizeof(readNumbers) / sizeof(int); ++i) {

printf("%d ", readNumbers[i]);

}

printf("\n");

// Close the file

fclose(fp);

return 0;

}

Output:

Read numbers from the file: 4543 0 640 0 0

Explanation:

In conclusion, an effective method for modifying the file position indicator inside a file stream is the C function fsetpos(). Programmers can set the location within a file using this function, which enables efficient navigation and random access while operating on files. By accepting an fpos_t object and a FILE pointer as inputs, the function allows fgetpos() to be used to restore a previously saved file position. When it comes to situations where you need to read or write data at specific locations within a file, this feature comes in handy. Fsetpos() improves the flexibility and control that programmers have over file operations in the C programming language, whether it is for updating particular sections of a file, creating custom file handling procedures, or managing intricate file structures.