X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/054889057ee8e0f9fcbaabd8825ff588136aeb01..520e470fdd0daef09c77938db642e4583933c90d:/src/common/string.cpp

diff --git a/src/common/string.cpp b/src/common/string.cpp
index 054074c259..70fdb635e1 100644
--- a/src/common/string.cpp
+++ b/src/common/string.cpp
@@ -41,6 +41,10 @@
 #include <string.h>
 #include <stdlib.h>
 
+#ifdef wxUSE_WCSRTOMBS
+  #include <wchar.h>    // for wcsrtombs(), see comments where it's used
+#endif // GNU
+
 #ifdef  WXSTRING_IS_WXOBJECT
   IMPLEMENT_DYNAMIC_CLASS(wxString, wxObject)
 #endif  //WXSTRING_IS_WXOBJECT
@@ -84,13 +88,19 @@ extern const char *g_szNul = &g_strEmpty.dummy;
 // iostream ones.
 //
 // ATTN: you can _not_ use both of these in the same program!
-#if 0 // def  _MSC_VER
-  #include  <iostream>
-  #define   NAMESPACE   std::
+#if wxUSE_IOSTREAMH
+#include <iostream.h>
+#define   NAMESPACE
 #else
-  #include  <iostream.h>
-  #define   NAMESPACE
-#endif  //Visual C++
+#include <iostream>
+#  ifdef _MSC_VER
+      using namespace std;
+#  endif
+// for msvc (bcc50+ also) you don't need these NAMESPACE defines,
+// using namespace std; takes care of that.
+#define   NAMESPACE   std::
+#endif
+
 
 NAMESPACE istream& operator>>(NAMESPACE istream& is, wxString& WXUNUSED(str))
 {
@@ -136,7 +146,7 @@ NAMESPACE istream& operator>>(NAMESPACE istream& is, wxString& WXUNUSED(str))
   {
   public:
     Averager(const char *sz) { m_sz = sz; m_nTotal = m_nCount = 0; }
-   ~Averager() 
+   ~Averager()
    { printf("wxString: average %s = %f\n", m_sz, ((float)m_nTotal)/m_nCount); }
 
     void Add(size_t n) { m_nTotal += n; m_nCount++; }
@@ -216,7 +226,17 @@ wxString::wxString(const void *pStart, const void *pEnd)
 wxString::wxString(const wchar_t *pwz)
 {
   // first get necessary size
+
+  // NB: GNU libc5 wcstombs() is completely broken, don't use it (it doesn't
+  //     honor the 3rd parameter, thus it will happily crash here).
+#ifdef wxUSE_WCSRTOMBS
+  // don't know if it's really needed (or if we can pass NULL), but better safe
+  // than quick
+  mbstate_t mbstate;  
+  size_t nLen = wcsrtombs((char *) NULL, &pwz, 0, &mbstate);
+#else  // !GNU libc
   size_t nLen = wcstombs((char *) NULL, pwz, 0);
+#endif // GNU
 
   // empty?
   if ( nLen != 0 ) {
@@ -564,20 +584,32 @@ void wxString::AllocCopy(wxString& dest, int nCopyLen, int nCopyIndex) const
 }
 
 // extract string of length nCount starting at nFirst
-// default value of nCount is 0 and means "till the end"
 wxString wxString::Mid(size_t nFirst, size_t nCount) const
 {
+  wxStringData *pData = GetStringData();
+  size_t nLen = pData->nDataLength;
+
+  // default value of nCount is STRING_MAXLEN and means "till the end"
+  if ( nCount == STRING_MAXLEN )
+  {
+    nCount = nLen - nFirst;
+  }
+
   // out-of-bounds requests return sensible things
-  if ( nCount == 0 )
-    nCount = GetStringData()->nDataLength - nFirst;
+  if ( nFirst + nCount > nLen )
+  {
+    nCount = nLen - nFirst;
+  }
 
-  if ( nFirst + nCount > (size_t)GetStringData()->nDataLength )
-    nCount = GetStringData()->nDataLength - nFirst;
-  if ( nFirst > (size_t)GetStringData()->nDataLength )
+  if ( nFirst > nLen )
+  {
+    // AllocCopy() will return empty string
     nCount = 0;
+  }
 
   wxString dest;
   AllocCopy(dest, nCount, nFirst);
+
   return dest;
 }
 
@@ -763,30 +795,40 @@ wxString& wxString::MakeLower()
 // trims spaces (in the sense of isspace) from left or right side
 wxString& wxString::Trim(bool bFromRight)
 {
-  CopyBeforeWrite();
-
-  if ( bFromRight )
+  // first check if we're going to modify the string at all
+  if ( !IsEmpty() && 
+       ( 
+        (bFromRight && isspace(GetChar(Len() - 1))) ||
+        (!bFromRight && isspace(GetChar(0u)))
+       )
+     )
   {
-    // find last non-space character
-    char *psz = m_pchData + GetStringData()->nDataLength - 1;
-    while ( isspace(*psz) && (psz >= m_pchData) )
-      psz--;
-
-    // truncate at trailing space start
-    *++psz = '\0';
-    GetStringData()->nDataLength = psz - m_pchData;
-  }
-  else
-  {
-    // find first non-space character
-    const char *psz = m_pchData;
-    while ( isspace(*psz) )
-      psz++;
-
-    // fix up data and length
-    int nDataLength = GetStringData()->nDataLength - (psz - m_pchData);
-    memmove(m_pchData, psz, (nDataLength + 1)*sizeof(char));
-    GetStringData()->nDataLength = nDataLength;
+    // ok, there is at least one space to trim
+    CopyBeforeWrite();
+
+    if ( bFromRight )
+    {
+      // find last non-space character
+      char *psz = m_pchData + GetStringData()->nDataLength - 1;
+      while ( isspace(*psz) && (psz >= m_pchData) )
+        psz--;
+
+      // truncate at trailing space start
+      *++psz = '\0';
+      GetStringData()->nDataLength = psz - m_pchData;
+    }
+    else
+    {
+      // find first non-space character
+      const char *psz = m_pchData;
+      while ( isspace(*psz) )
+        psz++;
+
+      // fix up data and length
+      int nDataLength = GetStringData()->nDataLength - (psz - m_pchData);
+      memmove(m_pchData, psz, (nDataLength + 1)*sizeof(char));
+      GetStringData()->nDataLength = nDataLength;
+    }
   }
 
   return *this;