Mercurial > hg > Members > innparusu > xv6-rpi

comparison src/usr/cat.c @ 0:83c23a36980d

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Init
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Fri, 26 May 2017 23:11:05 +0900
parents
children
comparison
equal deleted inserted replaced
-1:000000000000 0:83c23a36980d
1 #include "types.h"
2 #include "stat.h"
3 #include "user.h"
4
5 char buf[512];
6
7 void
8 cat(int fd)
9 {
10 int n;
11
12 while((n = read(fd, buf, sizeof(buf))) > 0)
13 write(1, buf, n);
14 if(n < 0){
15 printf(1, "cat: read error\n");
16 exit();
17 }
18 }
19
20 int
21 main(int argc, char *argv[])
22 {
23 int fd, i;
24
25 if(argc <= 1){
26 cat(0);
27 exit();
28 }
29
30 for(i = 1; i < argc; i++){
31 if((fd = open(argv[i], 0)) < 0){
32 printf(1, "cat: cannot open %s\n", argv[i]);
33 exit();
34 }
35 cat(fd);
36 close(fd);
37 }
38 exit();
39 }