1 #include <stdio.h>
2 #include <fcntl.h>
3 #include <string.h>
4 #include <stdlib.h>
5
6 #include <uv.h>
7
8 typedef struct {
9 uv_write_t req;
10 uv_buf_t buf;
11 } write_req_t;
12
13 uv_loop_t *loop;
14 uv_pipe_t stdin_pipe;
15 uv_pipe_t stdout_pipe;
16 uv_pipe_t file_pipe;
17
alloc_buffer(uv_handle_t * handle,size_t suggested_size,uv_buf_t * buf)18 void alloc_buffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf) {
19 *buf = uv_buf_init((char*) malloc(suggested_size), suggested_size);
20 }
21
free_write_req(uv_write_t * req)22 void free_write_req(uv_write_t *req) {
23 write_req_t *wr = (write_req_t*) req;
24 free(wr->buf.base);
25 free(wr);
26 }
27
on_stdout_write(uv_write_t * req,int status)28 void on_stdout_write(uv_write_t *req, int status) {
29 free_write_req(req);
30 }
31
on_file_write(uv_write_t * req,int status)32 void on_file_write(uv_write_t *req, int status) {
33 free_write_req(req);
34 }
35
write_data(uv_stream_t * dest,size_t size,uv_buf_t buf,uv_write_cb cb)36 void write_data(uv_stream_t *dest, size_t size, uv_buf_t buf, uv_write_cb cb) {
37 write_req_t *req = (write_req_t*) malloc(sizeof(write_req_t));
38 req->buf = uv_buf_init((char*) malloc(size), size);
39 memcpy(req->buf.base, buf.base, size);
40 uv_write((uv_write_t*) req, (uv_stream_t*)dest, &req->buf, 1, cb);
41 }
42
read_stdin(uv_stream_t * stream,ssize_t nread,const uv_buf_t * buf)43 void read_stdin(uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf) {
44 if (nread < 0){
45 if (nread == UV_EOF){
46 // end of file
47 uv_close((uv_handle_t *)&stdin_pipe, NULL);
48 uv_close((uv_handle_t *)&stdout_pipe, NULL);
49 uv_close((uv_handle_t *)&file_pipe, NULL);
50 }
51 } else if (nread > 0) {
52 write_data((uv_stream_t *)&stdout_pipe, nread, *buf, on_stdout_write);
53 write_data((uv_stream_t *)&file_pipe, nread, *buf, on_file_write);
54 }
55
56 // OK to free buffer as write_data copies it.
57 if (buf->base)
58 free(buf->base);
59 }
60
main(int argc,char ** argv)61 int main(int argc, char **argv) {
62 loop = uv_default_loop();
63
64 uv_pipe_init(loop, &stdin_pipe, 0);
65 uv_pipe_open(&stdin_pipe, 0);
66
67 uv_pipe_init(loop, &stdout_pipe, 0);
68 uv_pipe_open(&stdout_pipe, 1);
69
70 uv_fs_t file_req;
71 int fd = uv_fs_open(loop, &file_req, argv[1], O_CREAT | O_RDWR, 0644, NULL);
72 uv_pipe_init(loop, &file_pipe, 0);
73 uv_pipe_open(&file_pipe, fd);
74
75 uv_read_start((uv_stream_t*)&stdin_pipe, alloc_buffer, read_stdin);
76
77 uv_run(loop, UV_RUN_DEFAULT);
78 return 0;
79 }
80
