mirror of
https://github.com/ziglang/zig.git
synced 2025-12-17 03:33:06 +00:00
49d1a4c562
also start prefering NtDll API. so far: * NtQueryInformationFile * NtClose adds a performance workaround for windows unicode conversion. but that should probably be removed before merging
25 lines
611 B
C
Vendored
25 lines
611 B
C
Vendored
#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 = iov[0].iov_len ? syscall(SYS_readv, f->fd, iov, 2)
|
|
: syscall(SYS_read, f->fd, iov[1].iov_base, iov[1].iov_len);
|
|
if (cnt <= 0) {
|
|
f->flags |= cnt ? F_ERR : F_EOF;
|
|
return 0;
|
|
}
|
|
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;
|
|
}
|