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#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <uv.h>
typedef struct {
uv_write_t req;
uv_buf_t buf;
} write_req_t;
uv_loop_t *loop;
uv_pipe_t stdin_pipe;
uv_pipe_t stdout_pipe;
uv_pipe_t file_pipe;
void alloc_buffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf) {
*buf = uv_buf_init((char*) malloc(suggested_size), suggested_size);
}
void free_write_req(uv_write_t *req) {
write_req_t *wr = (write_req_t*) req;
free(wr->buf.base);
free(wr);
}
void on_stdout_write(uv_write_t *req, int status) {
free_write_req(req);
}
void on_file_write(uv_write_t *req, int status) {
free_write_req(req);
}
void write_data(uv_stream_t *dest, size_t size, uv_buf_t buf, uv_write_cb cb) {
write_req_t *req = (write_req_t*) malloc(sizeof(write_req_t));
req->buf = uv_buf_init((char*) malloc(size), size);
memcpy(req->buf.base, buf.base, size);
uv_write((uv_write_t*) req, (uv_stream_t*)dest, &req->buf, 1, cb);
}
void read_stdin(uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf) {
if (nread < 0){
if (nread == UV_EOF){
// end of file
uv_close((uv_handle_t *)&stdin_pipe, NULL);
uv_close((uv_handle_t *)&stdout_pipe, NULL);
uv_close((uv_handle_t *)&file_pipe, NULL);
}
} else if (nread > 0) {
write_data((uv_stream_t *)&stdout_pipe, nread, *buf, on_stdout_write);
write_data((uv_stream_t *)&file_pipe, nread, *buf, on_file_write);
}
// OK to free buffer as write_data copies it.
if (buf->base)
free(buf->base);
}
int main(int argc, char **argv) {
loop = uv_default_loop();
uv_pipe_init(loop, &stdin_pipe, 0);
uv_pipe_open(&stdin_pipe, 0);
uv_pipe_init(loop, &stdout_pipe, 0);
uv_pipe_open(&stdout_pipe, 1);
uv_fs_t file_req;
int fd = uv_fs_open(loop, &file_req, argv[1], O_CREAT | O_RDWR, 0644, NULL);
uv_pipe_init(loop, &file_pipe, 0);
uv_pipe_open(&file_pipe, fd);
uv_read_start((uv_stream_t*)&stdin_pipe, alloc_buffer, read_stdin);
uv_run(loop, UV_RUN_DEFAULT);
return 0;
}
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