try to finish find

Makefile

@@ -86,7 +86,7 @@ LD = $(TOOLPREFIX)ld
 OBJCOPY = $(TOOLPREFIX)objcopy
 OBJDUMP = $(TOOLPREFIX)objdump
 
-CFLAGS = -Wall -Werror -O2 -fno-omit-frame-pointer -ggdb -gdwarf-2
+CFLAGS = -Wall -Werror -Ofast -fno-omit-frame-pointer -ggdb -gdwarf-2
 
 ifdef LAB
 LABUPPER = $(shell echo $(LAB) | tr a-z A-Z)
@@ -191,6 +191,7 @@ UPROGS=\
 	$U/_sleep\
 	$U/_pingpong\
 	$U/_primes\
+	$U/_find\
 
 
 
@@ -227,10 +228,10 @@ $U/_uthread: $U/uthread.o $U/uthread_switch.o $(ULIB)
 	$(OBJDUMP) -S $U/_uthread > $U/uthread.asm
 
 ph: notxv6/ph.c
-	gcc -o ph -g -O2 $(XCFLAGS) notxv6/ph.c -pthread
+	gcc -o ph -g -Ofast $(XCFLAGS) notxv6/ph.c -pthread
 
 barrier: notxv6/barrier.c
-	gcc -o barrier -g -O2 $(XCFLAGS) notxv6/barrier.c -pthread
+	gcc -o barrier -g -Ofast $(XCFLAGS) notxv6/barrier.c -pthread
 endif
 
 ifeq ($(LAB),pgtbl)

kernel/fs.h

@@ -1,6 +1,6 @@
 // On-disk file system format.
 // Both the kernel and user programs use this header file.
-
+#include "kernel/types.h"
 
 #define ROOTINO 1  // root i-number
 #define BSIZE 1024 // block size
@@ -57,4 +57,3 @@ struct dirent {
   ushort inum;
   char name[DIRSIZ];
 };
-

user/find.c

@@ -0,0 +1,12 @@
+#include "kernel/fcntl.h"
+#include "kernel/fs.h"
+#include "kernel/stat.h"
+#include "kernel/types.h"
+#include "user/user.h"
+
+int main(int argc, char *argv[]) {
+  if (argc < 3) {
+    printf("Usage: find path pattern\n");
+  }
+  exit(0);
+}

user/ls.c

@@ -1,12 +1,10 @@
-#include "kernel/types.h"
-#include "kernel/stat.h"
-#include "user/user.h"
-#include "kernel/fs.h"
 #include "kernel/fcntl.h"
+#include "kernel/fs.h"
+#include "kernel/stat.h"
+#include "kernel/types.h"
+#include "user/user.h"
 
-char*
-fmtname(char *path)
-{
+char *fmtname(char *path) {
   static char buf[DIRSIZ + 1];
   char *p;
 
@@ -23,9 +21,7 @@ fmtname(char *path)
   return buf;
 }
 
-void
-ls(char *path)
-{
+void ls(char *path) {
   char buf[512], *p;
   int fd;
   struct dirent de;
@@ -72,9 +68,7 @@ ls(char *path)
   close(fd);
 }
 
-int
-main(int argc, char *argv[])
-{
+int main(int argc, char *argv[]) {
   int i;
 
   if (argc < 2) {