CODEWITHSUNDEEP
cfread
baira
baira

Reputation: 59

C: fread function returns 0

...
rewind(ftmpname);
if (stat(tmpname, &st_file)==-1) 
    longjmp(Berror, (ETMPSTAT) );

tmpsize = st_file.st_size;
i = 0;

while (i<tmpsize)
{
    n = fread(buf, 1, (READ_CONST), ftmpname );     
    write_byte(farch, buf, n);
    i+=n;
}
...

fread always returns 0. I don't know what's wrong. I do a rewind before, and it didn't help. Sorry for my English.

Upvotes: 0

Views: 1787

Answers (1)

user405725
user405725

Reputation:

If you don't know what is wrong, you have to check for errors. Here is what a manual page says:

RETURN VALUE

fread() and fwrite() return the number of items successfully read or written (i.e., not the number of characters). If an error occurs, or the end-of-file is reached, the return value is a short item count (or zero).

fread() does not distinguish between end-of-file and error, and callers must use feof(3) and ferror(3) to determine which occurred.

So why don't you use those functions which tell you exactly what is wrong?

Upvotes: 2

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