1#include "stdio_impl.h" 2#include <sys/uio.h> 3 4size_t __stdio_read(FILE* f, unsigned char* buf, size_t len) { 5 struct iovec iov[2] = {{.iov_base = buf, .iov_len = len - !!f->buf_size}, 6 {.iov_base = f->buf, .iov_len = f->buf_size}}; 7 ssize_t cnt = readv(f->fd, iov, 2); 8 if (cnt <= 0) { 9 f->flags |= F_EOF ^ ((F_ERR ^ F_EOF) & cnt); 10 return cnt; 11 } 12 if (cnt <= iov[0].iov_len) 13 return cnt; 14 cnt -= iov[0].iov_len; 15 f->rpos = f->buf; 16 f->rend = f->buf + cnt; 17 if (f->buf_size) 18 buf[len - 1] = *f->rpos++; 19 return len; 20} 21