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Showing content from https://www.tutorialspoint.com/c_standard_library/c_function_rename.htm below:

C Standard Library rename Function

The C library rename(const char *old_filename, const char *new_filename) function causes the filename referred to by old_filename to be changed to new_filename.

Following is the C library syntax of the rename() function −

int rename(const char *old_filename, const char *new_filename);

This function accepts the two parameters −

• old_filename:A pointer to a null-terminated string that specifies the name of the file to be renamed. This is the current name of the file.
• new_filename: A pointer to a null-terminated string that specifies the new name for the file. This is the name you want to give to the file.

The rename function returns both integer or non-integer value:

1. 0: If the operation is successful.

2. Non-zero value: If the operation fails. The exact value can vary, but in general, you can use errno to get more information about the error. Common errors include:

• EACCES: Permission denied.
• ENOENT: File specified by old_filename does not exist.
• EEXIST: A file with the name specified by new_filename already exists.
• EINVAL: The names specified are invalid.

This example renames a file named oldfile.txt to newfile.txt.

Below is the illustration of the C library rename() function.

#include <stdio.h>

int main() {
   if (rename("oldfile.txt", "newfile.txt") == 0) {
       printf("File renamed successfully.\n");
   } else {
       perror("Error renaming file");
   }
   return 0;
}

The above code produces following result−

File renamed successfully.

This example attempts to rename a non-existent file, demonstrating error handling and usage of errno.

#include <stdio.h>
#include <errno.h>

int main() {
   if (rename("nonexistentfile.txt", "newname.txt") != 0) {
       perror("Error renaming file");
       printf("Error code: %d\n", errno);
   } else {
       printf("File renamed successfully.\n");
   }
   return 0;
}

After execution of above code, we get the following result

Error renaming file: No such file or directory
Error code: 2

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