File Read Error Messages

[Salchester]

I am currently in need of at least 5-6 reasons why a file might not be read properly. Here is what i have so far:

The file has been moved, renamed or deleted.
It contains corrupt/invalid data.

These are to be displayed in a message when an error occurrs whilst reading or opening a file. See Below:

FILE READ ERROR...
An error occurred whilst attempting to access Students.txt
This might be because:
>> The file has been moved, renamed or deleted.
>> It contains corrupt/invalid data
>> The file is empty

[redhead]

Something like this ?

if(access(file_name, F_OK))
    /* file does not exist */
if(access(file_name, R_OK))
    /* No read permission */
if(!(file_pointer=fopen(file_name, "r")))
    /* Unable to open file */
if(feof(file_pointer))
   /* file is empty */
while(!feof(file_pointer))
{
    if(!fread(buffer, sizeof(buffer), 1, file_pointer))
        /* premature end of file */
    if(!valid(buffer))
        /* illformed or unexpected data */
}

[Salchester]

I know how to do it through coding, only can you think of 5-6 reasons why an error may occur. These are to be displayed to the user, along with a message explaining 5-6 solutions on why an error may have occured.

Can you think of any more? Two are listed above.

Many Thanks

[Valmont]

So you need only four more:
- No rights to access/modify/etc.. file.
- File locked.
- Network or media unaccessable.
- File doesn't exist.

[Locutus]

Read or open? Anyway, the man page / API documentation for a particular function generally has information about error codes and potential causes.