update PrintInt and change PutString to PutInt

code/userprog/ksyscall.h

@@ -37,33 +37,7 @@ int SysCreate(char *filename)
 }
 
 void SysPrintInt(int value) {
-  static char zero[2] = "0";
-
-  if (value == 0) {
-    kernel->synchConsoleOut->PutString(zero);
-    return;
-  }
-
-  char outputBuf[INT_BUF_LENGTH];
-  bool isNeg = false;
-  int curPos = INT_BUF_LENGTH;
-  outputBuf[--curPos] = '\0';
-  outputBuf[--curPos] = '\n';
-  
-  if (value < 0) {
-    isNeg = true;
-    value = -value;
-  }
-
-  while (value > 0) {
-    outputBuf[--curPos] = '0' + (value % 10);
-    value /= 10;
-  }
-
-  if (isNeg)
-    outputBuf[--curPos] = '-';
-
-  kernel->synchConsoleOut->PutString(&outputBuf[curPos]);
+  kernel->interrupt->PrintInt(value);
 }
 
 OpenFileId SysOpen(char *name) {

code/userprog/synchconsole.cc

@@ -107,10 +107,10 @@ SynchConsoleOutput::PutChar(char ch)
 }
 
 void
-SynchConsoleOutput::PutString(char *str)
+SynchConsoleOutput::PutInt(int value)
 {
     lock->Acquire();
-    consoleOutput->PutString(str);
+    consoleOutput->PutInt(value);
     waitFor->P();
     lock->Release();
 }

code/userprog/synchconsole.h

@@ -41,7 +41,7 @@ class SynchConsoleOutput : public CallBackObj {
     ~SynchConsoleOutput();
 
     void PutChar(char ch);	// Write a character, waiting if necessary
-    void PutString(char *ch);
+    void PutInt(int value);
    
   private:
     ConsoleOutput *consoleOutput;// the hardware display