| #include "stdio_impl.h" |
| #include <sys/uio.h> |
| |
| size_t __stdio_read(FILE *f, unsigned char *buf, size_t len) |
| { |
| struct iovec iov[2] = { |
| { .iov_base = buf, .iov_len = len - !!f->buf_size }, |
| { .iov_base = f->buf, .iov_len = f->buf_size } |
| }; |
| ssize_t cnt; |
| |
| cnt = syscall(SYS_readv, f->fd, iov, 2); |
| if (cnt <= 0) { |
| f->flags |= F_EOF ^ ((F_ERR^F_EOF) & cnt); |
| return cnt; |
| } |
| if (cnt <= iov[0].iov_len) return cnt; |
| cnt -= iov[0].iov_len; |
| f->rpos = f->buf; |
| f->rend = f->buf + cnt; |
| if (f->buf_size) buf[len-1] = *f->rpos++; |
| return len; |
| } |