From 15fad649ea51d25e168e0456b5621beb820e254d Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Sun, 27 Jan 2019 07:18:26 +0100
Subject: Userland: Make a simple /bin/cp for copying files.

---
 Kernel/sync.sh      |  1 +
 Userland/.gitignore |  1 +
 Userland/Makefile   |  5 +++++
 Userland/cp.cpp     | 42 ++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 49 insertions(+)
 create mode 100644 Userland/cp.cpp

diff --git a/Kernel/sync.sh b/Kernel/sync.sh
index 6b83e1549a..0a7524f6a7 100755
--- a/Kernel/sync.sh
+++ b/Kernel/sync.sh
@@ -43,6 +43,7 @@ cp -v ../Userland/touch mnt/bin/touch
 cp -v ../Userland/sync mnt/bin/sync
 cp -v ../Userland/more mnt/bin/more
 cp -v ../Userland/rm mnt/bin/rm
+cp -v ../Userland/cp mnt/bin/cp
 cp -v ../Userland/guitest mnt/bin/guitest
 cp -v ../Userland/guitest2 mnt/bin/guitest2
 cp -v ../Userland/sysctl mnt/bin/sysctl
diff --git a/Userland/.gitignore b/Userland/.gitignore
index 425fa3f830..45e4d0fcc6 100644
--- a/Userland/.gitignore
+++ b/Userland/.gitignore
@@ -25,3 +25,4 @@ guitest
 guitest2
 sysctl
 rm
+cp
diff --git a/Userland/Makefile b/Userland/Makefile
index a774dd3e40..4cca09a50d 100644
--- a/Userland/Makefile
+++ b/Userland/Makefile
@@ -22,6 +22,7 @@ OBJS = \
        guitest.o \
        guitest2.o \
        sysctl.o \
+       cp.o \
        rm.o
 
 APPS = \
@@ -49,6 +50,7 @@ APPS = \
        guitest \
        guitest2 \
        sysctl \
+       cp \
        rm
 
 ARCH_FLAGS =
@@ -141,6 +143,9 @@ guitest2: guitest2.o
 sysctl: sysctl.o
 	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
 
+cp: cp.o
+	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
+
 rm: rm.o
 	$(LD) -o $@ $(LDFLAGS) $< ../LibC/LibC.a
 
diff --git a/Userland/cp.cpp b/Userland/cp.cpp
new file mode 100644
index 0000000000..db5c08b2d9
--- /dev/null
+++ b/Userland/cp.cpp
@@ -0,0 +1,42 @@
+#include <unistd.h>
+#include <fcntl.h>
+#include <assert.h>
+#include <stdio.h>
+
+int main(int argc, char** argv)
+{
+    if (argc != 3) {
+        printf("usage: cp <source> <destination>\n");
+        return 0;
+    }
+    int src_fd = open(argv[1], O_RDONLY);
+    if (src_fd < 0) {
+        perror("open src");
+        return 1;
+    }
+    int dst_fd = open(argv[2], O_WRONLY | O_CREAT);
+    if (dst_fd < 0) {
+        perror("open dst");
+        return 1;
+    }
+
+    for (;;) {
+        char buffer[BUFSIZ];
+        ssize_t nread = read(src_fd, buffer, sizeof(buffer));
+        if (nread < 0) {
+            perror("read src");
+            return 1;
+        }
+        if (nread == 0)
+            break;
+        ssize_t nwritten = write(dst_fd, buffer, nread);
+        if (nwritten < 0) {
+            perror("write dst");
+            return 1;
+        }
+        assert(nwritten != 0);
+    }
+    close(src_fd);
+    close(dst_fd);
+    return 0;
+}
-- 
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