xv6

port of xv6 to x86-64
git clone http://frotz.net/git/xv6.git
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cat.c (513B)

      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 }