From 4e3351d4a75c02ac7a2a8c60cc6fa6579d95f08f Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Tue, 24 Jun 2025 04:38:09 -0400
Subject: usr.bin: Add initial 'cat' implementation

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 usr.bin/Makefile     |  1 +
 usr.bin/cat/Makefile |  6 +++++
 usr.bin/cat/cat.c    | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+)
 create mode 100644 usr.bin/cat/Makefile
 create mode 100644 usr.bin/cat/cat.c

diff --git a/usr.bin/Makefile b/usr.bin/Makefile
index 0dd6b84..18f4b47 100644
--- a/usr.bin/Makefile
+++ b/usr.bin/Makefile
@@ -14,3 +14,4 @@ all:
 	make -C beep/ $(ARGS)
 	make -C mrow/ $(ARGS)
 	make -C elfdump/ $(ARGS)
+	make -C cat/ $(ARGS)
diff --git a/usr.bin/cat/Makefile b/usr.bin/cat/Makefile
new file mode 100644
index 0000000..4ecfea7
--- /dev/null
+++ b/usr.bin/cat/Makefile
@@ -0,0 +1,6 @@
+include user.mk
+
+CFILES = $(shell find . -name "*.c")
+
+$(ROOT)/base/usr/bin/cat:
+	gcc $(CFILES) -o $@ $(INTERNAL_CFLAGS)
diff --git a/usr.bin/cat/cat.c b/usr.bin/cat/cat.c
new file mode 100644
index 0000000..d40986b
--- /dev/null
+++ b/usr.bin/cat/cat.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+/*
+ * TODO FIXME (BUG): Print line by line (fix line clobbering issue)
+ */
+static void
+cat(const char *pathname)
+{
+    char buf[4096];
+    int fd;
+
+    fd = open(pathname, O_RDONLY);
+    if (fd < 0) {
+        printf("cat: could not open %s\n", pathname);
+        return;
+    }
+
+    read(fd, buf, sizeof(buf));
+    printf("%s", buf);
+    close(fd);
+}
+
+int
+main(int argc, char **argv)
+{
+    for (size_t i = 1; i < argc; ++i) {
+        cat(argv[i]);
+    }
+
+    return 0;
+}
+
-- 
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