dev(shell): implement basic shell tools

fixed(file-system): fixed read and write bugs

1 files changed, 48 insertions, 0 deletions

diff --git a/src/user/cp.cc b/src/user/cp.cc
new file mode 100644
index 0000000..9f13bef
--- /dev/null
+++ b/src/user/cp.cc
@@ -0,0 +1,48 @@
+#include "ulib/stdio.h"
+#include "ulib/stdlib.h"
+#include "user/user.h"
+#include "common/fcntl.h"
+
+char buf[512];
+
+int main(int argc, char *argv[])
+{
+    int fd_src, fd_dst, n;
+
+    if (argc != 3)
+    {
+        printf("Usage: cp src dst\n");
+        exit(1);
+    }
+
+    if ((fd_src = open(argv[1], O_RDONLY)) < 0)
+    {
+        printf("cp: cannot open source %s\n", argv[1]);
+        exit(1);
+    }
+
+    if ((fd_dst = open(argv[2], O_WRONLY | O_CREATE | O_TRUNC)) < 0)
+    {
+        printf("cp: cannot create destination %s\n", argv[2]);
+        close(fd_src);
+        exit(1);
+    }
+
+    while ((n = read(fd_src, buf, sizeof(buf))) > 0)
+    {
+        if (write(fd_dst, buf, n) != n)
+        {
+            printf("cp: write error\n");
+            exit(1);
+        }
+    }
+
+    if (n < 0)
+    {
+        printf("cp: read error\n");
+    }
+
+    close(fd_src);
+    close(fd_dst);
+    exit(0);
+}
\ No newline at end of file