From 6c9563e91eb7aa738aa2656d141ce56ef66b50cf Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Sat, 16 May 2020 10:39:05 -0700
Subject: feat: added directory for command line tools

---
 sys/cmd/cat/cat.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 sys/cmd/cat/cat.c

(limited to 'sys/cmd/cat/cat.c')

diff --git a/sys/cmd/cat/cat.c b/sys/cmd/cat/cat.c
new file mode 100644
index 0000000..847ec0c
--- /dev/null
+++ b/sys/cmd/cat/cat.c
@@ -0,0 +1,40 @@
+#include <u.h>
+#include <libn.h>
+
+static
+void
+cat(Stream *f, byte *name)
+{
+    long n;
+    byte buf[8192];
+
+    while(n = io·read(f, 1, arrlen(buf), buf), n > 0) {
+        if (io·write(stdout, 1, n, buf) != n) {
+            panicf("failed to write while copying stream '%s'", name);
+        }
+    }
+
+    if (n < 0) {
+        panicf("failed to read from buffer '%s'", name);
+    }
+}
+
+
+int
+main(int argc, char *argv[])
+{
+    int i;
+    Stream *f;
+
+    if (argc == 1)  {
+        f = stdin;
+        cat(f, "<stdin>");
+    } else for (i = 1; i < argc; i++) {
+        if (f = io·open(argv[i], "r"), f == nil) 
+            panicf("can't open %s", argv[i]);
+        cat(f, argv[i]);
+        io·close(f);
+    }
+    
+    exit(0);
+}
-- 
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