CODEWITHSUNDEEP
cmacos
EhevuTov
EhevuTov

Reputation: 20463

How to find the size of a file in a different relative directory using stat() in C?

Here's my function to get the size of a file using stat():

off_t fsize(const char *filename) {                                                                                                                   
  struct stat st;                                                                                                                                        

  if (stat(filename, &st) == 0)                                                                                                                          
     return st.st_size;                                                                                                                                 

  fprintf(stderr, "Cannot determine size of %s: %s\n",                                                                                                   
         filename, strerror(errno));                                                                                                                    

  return -1;                                                                                                                                             
}

I can get the file size just fine by doing:

size = fsize ("byte.bin");

but when I need to get the file from a lower directory from the local directory, let's say "deps/src" directory, it stops prematurely on me with no error message that i expected:

size = fsize ("deps/src/byte.bin");

I wrote a small program that uses the function, copied the byte.bin file to a "deps/byte.bin" and called my fsize function with "deps/byte.bin" and get the error "Cannot determine size of byte.bin: No such file or directory"

If I use an absolute path like "/something/deps/byte.bin" it works.

What am I doing wrong and how show I do this for the relative path?

Upvotes: 1

Views: 236

Answers (1)

Daniel
Daniel

Reputation: 6745

I'm guessing that what's happening is that you are incorrectly assuming about the working directory. A simple way to test where the working directory is would be to just write a program that simply outputs a file like test.txt. In many (but not all) cases, the working directory is wherever the executable file is stored. This means that if you are trying to access a file on a relative path, you will likely need to include at least one .. in your relative path to get out of the bin directory.

Upvotes: 1

Related Questions