Write a C code that copies one file from the original file to destination file a

Question

Write a C code that copies one file from the original file to destination file as follows.

$ ./copy_HW1 off1 original_file off2 destination_file

1. This usage of command, copy_HW1 shows that copy_HW1 program copies from

(off1+1) th byte to the end of the original_file to destination_file starting from

(off2+1) th byte.

example: $ ./copy_HW1 100 x.txt 50 y.txt : copies contents from 101 st bytes to the

end of x.txt file to 51 st byte position of y.txt

2. The number of command arguments should accept 3 or 4 or 5 arguments.

$ ./copy_HW1 original_file destination_file

copies original_file to destination_file starting from the first position for both files

$ ./copy_HW1 off1 original_file destination_file

copies original_file starting from (off1+1) th byte to destination_file starting from the

first position

$ ./copy_HW1 original_file off2 destination_file

copies original_file starting from the first byte to destination_file starting from the

(off2+1) th byte

Other than this, error message should be returned.

3. Invalid offset value (for example -1 for SEEK_SET) should be checked giving an error

message such as “Invalid argument”.

4. When the specified starting point is greater than the file size of the original_file,

destination_file will have empty content (size 0).

5. Use ‘getLong( ... )’ function defined in tlpi_hdr.h header file

6. Compile using ‘make copy_HW1’ in the ‘fileio’ directory given in the source file

distribution of the textbook.

7. Each case (1 through 5 with different arguments) will be tested.

Explanation / Answer

Here is the C program that copies content from original file to destination file:

#include <stdio.h>

#include <stdlib.h>

int main()

{

FILE *fptr1, *fptr2;

char filename[100], c;

printf("Enter the filename to open for reading ");

scanf("%s", filename);

fptr1 = fopen(filename, "r");

if (fptr1 == NULL)

{

printf("Cannot open file %s ", filename);

exit(0);

}

printf("Enter the filename to open for writing ");

scanf("%s", filename);

fptr2 = fopen(filename, "w");

if (fptr2 == NULL)

{

printf("Cannot open file %s ", filename);

exit(0);

}

c = fgetc(fptr1);

while (c != EOF)

{

fputc(c, fptr2);

c = fgetc(fptr1);

}

printf(" Contents copied to %s", filename);

fclose(fptr1);

fclose(fptr2);

return 0;

}

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