Done lab

Makefile

@@ -184,6 +184,9 @@ UPROGS=\
 	_usertests\
 	_wc\
 	_zombie\
+	_myprogram\
+	_cp\
+	_mv\
 
 fs.img: mkfs README $(UPROGS)
 	./mkfs fs.img README $(UPROGS)
@@ -253,6 +256,9 @@ qemu-nox-gdb: fs.img xv6.img .gdbinit
 EXTRA=\
 	mkfs.c ulib.c user.h cat.c echo.c forktest.c grep.c kill.c\
 	ln.c ls.c mkdir.c rm.c stressfs.c usertests.c wc.c zombie.c\
+	myprogram.c\
+	cp.c\
+	mv.c\
 	printf.c umalloc.c\
 	README dot-bochsrc *.pl toc.* runoff runoff1 runoff.list\
 	.gdbinit.tmpl gdbutil\

cp.c

@@ -0,0 +1,52 @@
+#include "types.h"
+#include "user.h"
+#include "fcntl.h"
+#include "stat.h"
+
+int is_directory(struct stat *st) {
+    return st->type == T_DIR;
+}
+
+void cp(char *from, char *to) {
+    int fd1, fd2, n;
+    char buf[512];
+
+    struct stat st_1;
+
+    if (stat(from, &st_1) < 0){
+        printf(1, "Error in source file\n");
+    }
+
+    if (is_directory(&st_1)) {
+        printf(1, "Can not copy from directory\n");
+    }
+
+    fd1 = open(from, O_RDONLY);
+    fd2 = open(to, O_CREATE | O_WRONLY);
+
+    if(fd1 < 0) {
+        printf(1, "Cannot open source file\n");
+        exit();
+    }
+
+    if(fd2 < 0) {
+        printf(1, "Cannot open destination file\n");
+        exit();
+    }
+
+    while((n = read(fd1, buf, sizeof(buf))) > 0) {
+        write(fd2, buf, n);
+    }
+
+    close(fd1);
+    close(fd2);
+}
+
+int main(int argc, char *argv[]) {
+    if(argc != 3) {
+        printf(1, "Wrong number of arguments\n");
+        exit();
+    }
+    cp(argv[1], argv[2]);
+    exit();
+}

mv.c

@@ -0,0 +1,21 @@
+#include "types.h"
+#include "user.h"
+
+int main(int argc, char *argv[]) {
+    if(argc != 3) {
+        printf(1, "Usage: mv <from_file> <to_file>\n");
+        exit();
+    }
+
+    if(link(argv[1], argv[2]) < 0) {
+        printf(1, "Cannot link first path to second\n");
+        exit();
+    }
+
+    if(unlink(argv[1]) < 0) {
+        printf(1, "Cannot unlink file from source path\n");
+        exit();
+    }
+
+    exit();
+}

myprogram.c

@@ -0,0 +1,9 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+int main(void)
+{
+  printf(1, "Hello world!\n");
+  exit();
+}