#include <sys/uio.h> | |
#include "stdio_impl.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 = 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; | |
} |