From ab400c0be5577cab2a66d242183887ebbd61717f Mon Sep 17 00:00:00 2001
From: Nicholas <nbnoll@eml.cc>
Date: Wed, 17 Nov 2021 08:22:03 -0800
Subject: checkin

---
 src/cmd/core/cat.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 src/cmd/core/cat.c

(limited to 'src/cmd/core/cat.c')

diff --git a/src/cmd/core/cat.c b/src/cmd/core/cat.c
new file mode 100644
index 0000000..4f0929c
--- /dev/null
+++ b/src/cmd/core/cat.c
@@ -0,0 +1,52 @@
+#include <u.h>
+#include <base.h>
+#include <libfmt.h>
+
+static void
+usage(void)
+{
+    fmt·panic("usage: %s [-u] [file ...]\n", argv0);
+    exits("usage");
+}
+
+static void
+cat(int fd, char *s)
+{
+    long n;
+    char buf[8192];
+
+    while((n=read(fd, buf, sizeof(buf)))>0){
+        if(write(1, buf, n) != n)
+            fmt·panic("write error copying %s: %r", s);
+    }
+
+    if(n<0)
+        fmt·panic("error reading %s: %r", s);
+}
+
+int
+main(int argc, char *argv[])
+{
+    int fd;
+
+    ARGBEGIN{
+    case 'u': /* ignore */ break;
+    default:
+        usage();
+    }ARGEND;
+
+    if(!argc){
+        cat(0, "<stdin>");
+        exits(0);
+    }
+
+    while(argc-- > 0){
+        if((fd = open(*argv, O_RDONLY))<0)
+            fmt·panic("can't open %s: %r", *argv);
+
+        cat(fd, *argv);
+        close(fd);
+
+        argv++;
+    }
+}
-- 
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