File size information in C

Hey, /prog/

When you have a pointer to a FILE structure, what's the standard way of determining the size (in bytes) of the open file?

if you use fstat, make sure you use st_blksize and st_blocks to get the size, since st_size can overflow. if off_t is 32 bits, it'll overflow at 4GB. if off_t is 64 bits, it'll overflow at 16EB.