lstrcpy and lstrcat should return NULL if the string to copy to is NULL instead of crashing; verified by a test app on Windows XP

svn path=/trunk/; revision=9998

reactos/lib/kernel32/string/lstring.c

@@ -21,7 +21,7 @@ lstrcmpA(
 	 LPCSTR lpString2
 	 )
 {
-	return strcmp(lpString1,lpString2);
+  return strcmp(lpString1,lpString2);
 }
 
 
@@ -35,7 +35,7 @@ lstrcmpiA(
 	  LPCSTR lpString2
 	  )
 {
-        return _stricmp(lpString1,lpString2); 
+  return _stricmp(lpString1,lpString2); 
 }
 
 
@@ -54,6 +54,11 @@ lstrcpynA(
      lpString1 with NUL bytes while lstrcpynA doesn't. Also lstrcpynA
      guarantees NUL termination while strncpy doesn't */
 
+  if (lpString1 == NULL)
+  {
+    return NULL;
+  }
+
   if (1 < iMaxLength)
     {
       char *d = lpString1;
@@ -89,7 +94,12 @@ lstrcpyA(
 	 LPCSTR lpString2
 	 )
 {
-	return strcpy(lpString1,lpString2);
+  if (lpString1 == NULL)
+  {
+    return NULL;
+  }
+
+  return strcpy(lpString1,lpString2);
 }
 
 
@@ -103,7 +113,12 @@ lstrcatA(
 	 LPCSTR lpString2
 	 )
 {
-	return strcat(lpString1,lpString2);
+  if (lpString1 == NULL)
+  {
+    return NULL;
+  }
+
+  return strcat(lpString1,lpString2);
 }
 
 
@@ -116,7 +131,7 @@ lstrlenA(
 	 LPCSTR lpString
 	 )
 {
-	return strlen(lpString);
+  return strlen(lpString);
 }
 
 
@@ -130,7 +145,7 @@ lstrcmpW(
 	 LPCWSTR lpString2
 	 )
 {
-	return wcscmp(lpString1,lpString2);
+  return wcscmp(lpString1,lpString2);
 }
 
 
@@ -144,7 +159,7 @@ lstrcmpiW(
     LPCWSTR lpString2
     )
 {
-        return _wcsicmp(lpString1,lpString2);
+  return _wcsicmp(lpString1,lpString2);
 }
 
 
@@ -163,6 +178,11 @@ lstrcpynW(
      lpString1 with NUL bytes while lstrcpynW doesn't Also lstrcpynW
      guarantees NUL termination while wcsncpy doesn't */
 
+  if (lpString1 == NULL)
+  {
+    return NULL;
+  }
+
   if (1 < iMaxLength)
     {
       WCHAR *d = lpString1;
@@ -198,7 +218,12 @@ lstrcpyW(
     LPCWSTR lpString2
     )
 {
-	return wcscpy(lpString1,lpString2);	
+  if (lpString1 == NULL)
+  {
+    return NULL;
+  }
+
+  return wcscpy(lpString1,lpString2);	
 }
 
 
@@ -212,7 +237,12 @@ lstrcatW(
     LPCWSTR lpString2
     )
 {
-	return wcscat(lpString1,lpString2);
+  if (lpString1 == NULL)
+  {
+    return NULL;
+  }
+
+  return wcscat(lpString1,lpString2);
 }
 
 
@@ -225,5 +255,5 @@ lstrlenW(
     LPCWSTR lpString
     )
 {
-	return wcslen(lpString);
+  return wcslen(lpString);
 }