sys/src/cmd/cat.c

   1 #include <u.h>
   2 #include <libc.h>
   3
   4 void
   5 cat(int f, char *s)
   6 {
   7         char buf[8192];
   8         long n;
   9
  10         while((n=read(f, buf, (long)sizeof buf))>0)
  11                 if(write(1, buf, n)!=n)
  12                         sysfatal("write error copying %s: %r", s);
  13         if(n < 0)
  14                 sysfatal("error reading %s: %r", s);
  15 }
  16
  17 void
  18 main(int argc, char *argv[])
  19 {
  20         int f, i;
  21
  22         argv0 = "cat";
  23         if(argc == 1)
  24                 cat(0, "<stdin>");
  25         else for(i=1; i<argc; i++){
  26                 f = open(argv[i], OREAD);
  27                 if(f < 0)
  28                         sysfatal("can't open %s: %r", argv[i]);
  29                 else{
  30                         cat(f, argv[i]);
  31                         close(f);
  32                 }
  33         }
  34         exits(0);
  35 }
  36