cat: ignore -u and - can be used for stdin

1 files changed, 10 insertions, 10 deletions

diff --git a/src/cat.c b/src/cat.c
index 5a1c463..a1b678e 100644
--- a/src/cat.c
+++ b/src/cat.c
@@ -6,17 +6,20 @@
 #include <string.h>
 
 int
-cat(int fd,const char *filename)
+cat(int fd, const char *filename)
 {
   int c;
   char buf[8192];
-
+  if (filename[0] == '-')
+    fd = 0;
+  
   if(fd != 0)
     fd = open(filename, O_RDONLY);
 
   if (fd == -1)
     fprintf(stderr,"error opening %s: %s\n",filename,strerror(errno));
 
+
   while((c = read(fd,buf,sizeof(buf))) > 0)
     write(1,buf,c);
   close(fd);
@@ -25,14 +28,11 @@ cat(int fd,const char *filename)
 int
 main(int argc, char *argv[])
 {
-
-  if(argc == 1)
-    cat(0,NULL);
-  else for(int i = optind; i<argc;i++)
-      {
-	int c = getopt(argc, argv, "u");
-	cat(1,argv[i]);
-      }
+  int c = getopt(argc,argv,"u");
+  if (argc == optind)
+    cat(0,"-");
+  for(int i = optind; i<argc;i++)
+    cat(1,argv[i]);
 
   return 0;
 }