add glui library

Extras/glui/glui_string.cpp

@@ -0,0 +1,62 @@
+/****************************************************************************
+  
+  GLUI User Interface Toolkit
+  ---------------------------
+
+     glui.cpp
+
+
+          --------------------------------------------------
+
+  Copyright (c) 1998 Paul Rademacher (this file, Bill Baxter 2005)
+
+  This library is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA
+
+  This program is -not- in the public domain.
+
+*****************************************************************************/
+
+#include "GL/glui.h"
+#include <stdarg.h>
+
+#ifdef _MSC_VER
+#define vsnprintf _vsnprintf
+#endif
+
+GLUI_String& glui_format_str(GLUI_String& str, const char* fmt, ...)
+{
+  const size_t ISIZE = 128;
+  char stackbuf[ISIZE];
+  size_t bufsz = ISIZE;
+  char *buf = stackbuf;
+  str = "";
+  va_list arg;
+  while (1) {
+    va_start(arg, fmt);
+    int ret = vsnprintf(buf,299,fmt,arg);
+    va_end(arg);
+    if (ret>=0) {
+      break;
+    }
+    // else make a bigger buf, try again
+    bufsz <<= 1;
+    if (buf==stackbuf) buf = (char*)malloc(sizeof(char)*bufsz);
+    else buf = (char*)realloc(buf, sizeof(char)*bufsz);
+  }
+  if (buf!=stackbuf) free(buf);
+  str=buf;
+  return str;
+}