X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/32c62191d791de6be1ef54a91ab140d960705f29..5fa150e233fa449ee270ac26ecf074f5c40acb1e:/src/common/string.cpp

diff --git a/src/common/string.cpp b/src/common/string.cpp
index 99bb5a55a3..c2bab603e2 100644
--- a/src/common/string.cpp
+++ b/src/common/string.cpp
@@ -86,44 +86,8 @@ extern const wxChar WXDLLIMPEXP_BASE *wxEmptyString = &g_strEmpty.dummy;
 
 #if wxUSE_STD_IOSTREAM
 
-// MS Visual C++ version 5.0 provides the new STL headers as well as the old
-// iostream ones.
-//
-// ATTN: you can _not_ use both of these in the same program!
-
 #include <iostream>
 
-wxSTD istream& operator>>(wxSTD istream& is, wxString& WXUNUSED(str))
-{
-#if 0
-  int w = is.width(0);
-  if ( is.ipfx(0) ) {
-    streambuf *sb = is.rdbuf();
-    str.erase();
-    while ( true ) {
-      int ch = sb->sbumpc ();
-      if ( ch == EOF ) {
-        is.setstate(ios::eofbit);
-        break;
-      }
-      else if ( isspace(ch) ) {
-        sb->sungetc();
-        break;
-      }
-
-      str += ch;
-      if ( --w == 1 )
-        break;
-    }
-  }
-
-  is.isfx();
-  if ( str.length() == 0 )
-    is.setstate(ios::failbit);
-#endif
-  return is;
-}
-
 wxSTD ostream& operator<<(wxSTD ostream& os, const wxString& str)
 {
 #ifdef __BORLANDC__
@@ -210,8 +174,16 @@ void wxStringBase::InitWith(const wxChar *psz, size_t nPos, size_t nLength)
 // poor man's iterators are "void *" pointers
 wxStringBase::wxStringBase(const void *pStart, const void *pEnd)
 {
-  InitWith((const wxChar *)pStart, 0,
-           (const wxChar *)pEnd - (const wxChar *)pStart);
+  if ( pEnd >= pStart )
+  {
+    InitWith((const wxChar *)pStart, 0,
+             (const wxChar *)pEnd - (const wxChar *)pStart);
+  }
+  else
+  {
+    wxFAIL_MSG( _T("pStart is not before pEnd") );
+    Init();
+  }
 }
 
 wxStringBase::wxStringBase(size_type n, wxChar ch)
@@ -470,36 +442,47 @@ void wxStringBase::swap(wxStringBase& str)
 
 size_t wxStringBase::find(const wxStringBase& str, size_t nStart) const
 {
+    // deal with the special case of empty string first
+    const size_t nLen = length();
+    const size_t nLenOther = str.length();
+
+    if ( !nLenOther )
+    {
+        // empty string is a substring of anything
+        return 0;
+    }
+
+    if ( !nLen )
+    {
+        // the other string is non empty so can't be our substring
+        return npos;
+    }
+
     wxASSERT( str.GetStringData()->IsValid() );
-    wxASSERT( nStart <= length() );
+    wxASSERT( nStart <= nLen );
 
-    //anchor
+    const wxChar * const other = str.c_str();
+
+    // anchor
     const wxChar* p = (const wxChar*)wxTmemchr(c_str() + nStart,
-                                               str.c_str()[0],
-                                               length() - nStart);
+                                               *other,
+                                               nLen - nStart);
 
-    if(!p)
+    if ( !p )
         return npos;
 
-    while(p - c_str() + str.length() <= length() &&
-          wxTmemcmp(p, str.c_str(), str.length()) )
+    while ( p - c_str() + nLenOther <= nLen && wxTmemcmp(p, other, nLenOther) )
     {
-        //Previosly passed as the first argument to wxTmemchr,
-        //but C/C++ standard does not specify evaluation order
-        //of arguments to functions -
-        //http://embedded.com/showArticle.jhtml?articleID=9900607
-        ++p;
-
-        //anchor again
-        p = (const wxChar*)wxTmemchr(p,
-                                     str.c_str()[0],
-                                     length() - (p - c_str()));
-
-        if(!p)
+        p++;
+
+        // anchor again
+        p = (const wxChar*)wxTmemchr(p, *other, nLen - (p - c_str()));
+
+        if ( !p )
             return npos;
     }
 
-    return (p - c_str() + str.length() <= length()) ? p - c_str() : npos;
+    return p - c_str() + nLenOther <= nLen ? p - c_str() : npos;
 }
 
 size_t wxStringBase::find(const wxChar* sz, size_t nStart, size_t n) const