X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/fbc535ff084f61ec376f339c515d96d74065c18b..518f33a4e50585cab19757375a2c348e61d2594f:/src/common/string.cpp

diff --git a/src/common/string.cpp b/src/common/string.cpp
index 3cb10f3186..77026933c0 100644
--- a/src/common/string.cpp
+++ b/src/common/string.cpp
@@ -41,6 +41,12 @@
 #include <string.h>
 #include <stdlib.h>
 
+// This probably isn't right, what should it be Vadim?
+// Otherwise we end up with no wxVsprintf defined.
+#ifdef __WXMOTIF__
+#define HAVE_VPRINTF
+#endif
+
 #ifdef wxUSE_WCSRTOMBS
   #include <wchar.h>    // for wcsrtombs(), see comments where it's used
 #endif // GNU
@@ -78,6 +84,31 @@ static const struct
 // empty C style string: points to 'string data' byte of g_strEmpty
 extern const char *g_szNul = &g_strEmpty.dummy;
 
+// ----------------------------------------------------------------------------
+// conditional compilation
+// ----------------------------------------------------------------------------
+
+// we want to find out if the current platform supports vsnprintf()-like
+// function: for Unix this is done with configure, for Windows we test the
+// compiler explicitly.
+#ifdef __WXMSW__
+    #ifdef _MSC_VER
+        #define wxVsprintf     _vsnprintf
+    #endif
+#else   // !Windows
+    #ifdef HAVE_VSNPRINTF
+        #define wxVsprintf       vsnprintf
+    #endif
+#endif  // Windows/!Windows
+
+#ifndef wxVsprintf
+    // in this case we'll use vsprintf() (which is ANSI and thus should be
+    // always available), but it's unsafe because it doesn't check for buffer
+    // size - so give a warning
+    #define wxVsprintf(buffer,len,format,argptr) vsprintf(buffer,format, argptr)
+    #pragma message("Using sprintf() because no snprintf()-like function defined")
+#endif
+
 // ----------------------------------------------------------------------------
 // global functions
 // ----------------------------------------------------------------------------
@@ -88,14 +119,6 @@ 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::
-#else
-  #include  <iostream.h>
-  #define   NAMESPACE
-#endif  //Visual C++
-
 #if wxUSE_IOSTREAMH
 #include <iostream.h>
 #define   NAMESPACE
@@ -104,9 +127,26 @@ extern const char *g_szNul = &g_strEmpty.dummy;
 #  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
 
+#ifdef __WXMSW__
+    #ifdef _MSC_VER
+        #define wxVsprintf     _vsnprintf
+    #endif
+#else
+    #if defined ( HAVE_VSNPRINTF )
+        #define wxVsprintf       vsnprintf
+    #endif
+#endif
+
+#ifndef wxVsprintf
+    // vsprintf() is ANSI so we can always use it, but it's unsafe!
+    #define wxVsprintf(buffer,len,format,argptr) vsprintf(buffer,format, argptr)
+    #pragma message("Using sprintf() because no snprintf()-like function defined")
+#endif
 
 NAMESPACE istream& operator>>(NAMESPACE istream& is, wxString& WXUNUSED(str))
 {
@@ -859,8 +899,13 @@ wxString& wxString::Pad(size_t nCount, char chPad, bool bFromRight)
 // truncate the string
 wxString& wxString::Truncate(size_t uiLen)
 {
-  *(m_pchData + uiLen) = '\0';
-  GetStringData()->nDataLength = uiLen;
+  if ( uiLen < Len() ) {
+    CopyBeforeWrite();
+
+    *(m_pchData + uiLen) = '\0';
+    GetStringData()->nDataLength = uiLen;
+  }
+  //else: nothing to do, string is already short enough
 
   return *this;
 }
@@ -885,6 +930,33 @@ int wxString::Find(const char *pszSub) const
   return (psz == NULL) ? NOT_FOUND : psz - m_pchData;
 }
 
+// ---------------------------------------------------------------------------
+// stream-like operators
+// ---------------------------------------------------------------------------
+wxString& wxString::operator<<(int i)
+{
+    wxString res;
+    res.Printf("%d", i);
+
+    return (*this) << res;
+}
+
+wxString& wxString::operator<<(float f)
+{
+    wxString res;
+    res.Printf("%f", f);
+
+    return (*this) << res;
+}
+
+wxString& wxString::operator<<(double d)
+{
+    wxString res;
+    res.Printf("%g", d);
+
+    return (*this) << res;
+}
+
 // ---------------------------------------------------------------------------
 // formatted output
 // ---------------------------------------------------------------------------
@@ -902,11 +974,41 @@ int wxString::Printf(const char *pszFormat, ...)
 
 int wxString::PrintfV(const char* pszFormat, va_list argptr)
 {
+  // static buffer to avoid dynamic memory allocation each time
   static char s_szScratch[1024];
 
-  int iLen = vsprintf(s_szScratch, pszFormat, argptr);
+  // NB: wxVsprintf() may return either less than the buffer size or -1 if there
+  //     is not enough place depending on implementation
+  int iLen = wxVsprintf(s_szScratch, WXSIZEOF(s_szScratch), pszFormat, argptr);
+  char *buffer;
+  if ( iLen < (int)WXSIZEOF(s_szScratch) ) {
+    buffer = s_szScratch;
+  }
+  else {
+      int size = WXSIZEOF(s_szScratch) * 2;
+      buffer = (char *)malloc(size);
+      while ( buffer != NULL ) {
+          iLen = wxVsprintf(buffer, WXSIZEOF(s_szScratch), pszFormat, argptr);
+          if ( iLen < size ) {
+              // ok, there was enough space
+              break;
+          }
+
+          // still not enough, double it again
+          buffer = (char *)realloc(buffer, size *= 2);
+      }
+
+      if ( !buffer ) {
+          // out of memory
+          return -1;
+      }
+  }
+
   AllocBeforeWrite(iLen);
-  strcpy(m_pchData, s_szScratch);
+  strcpy(m_pchData, buffer);
+
+  if ( buffer != s_szScratch )
+      free(buffer);
 
   return iLen;
 }