Fix syscall_read to handle partial reads and errors #257
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In the original syscall_read function, an assertion error could occur when the number of bytes read didn't match the number of bytes requested. This was because the function didn't handle partial reads and errors properly.
The modified syscall_read function now handles partial reads by breaking the loop when a read operation doesn't fill the entire buffer. Additionally, it checks for errors during the read operation and sets the return value to -1 if an error occurs.
Close: #214