vsprintf()

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Sun, 2015-03-15 19:49
#1
mritter0
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Joined: 2014-04-21 21:15
vsprintf()

I have been using this Requster on OS3.9 for a long time. Now I am moving to OS4.1FE. It crashes whenever there are args:

Works:

  1. SAK_EasyRequest(Objects[OID_WINDOW],MainWindow,RequesterTitle,0,NULL,"Name:Mark\nCountry:USA",0,SAK_LocaleString(MSG_TERMINATE));

Crashes:

  1. SAK_EasyRequest(Objects[OID_WINDOW],MainWindow,RequesterTitle,0,NULL,"Name:%s\nCountry:%s",0,SAK_LocaleString(MSG_TERMINATE),"Mark","USA");

Is the vsprintf() not GCC/OS4.1 friendly?

  1. VARARGS68K int32
  2. SAK_EasyRequest(Object *WinObject,struct Window *Window,STRPTR Title,int32 ImageType,struct Image *Image,STRPTR Text,uint32 Timer,STRPTR Gadgets,...)
  3. {
  4. 	Object              *Requester;
  5. 	int32               Result;
  6. 	char                VABuffer[1024];
  7. 	va_list             VarArgs;
  8.  
  9. 	va_startlinear(VarArgs,Gadgets);
  10. 	vsprintf(VABuffer,Text,va_getlinearva(VarArgs,void*));
  11. 	va_end(VarArgs);
  12.  
  13. 	if (!(Requester=RequesterObject,
  14. 		REQ_TitleText,		Title,
  15. 		REQ_Type,		0,
  16. 		REQ_Image,		ImageType ? REQIMAGE_ERROR : REQIMAGE_INFO,
  17. 		REQ_BodyText,		VABuffer,
  18. 		REQ_WrapBorder,		35,
  19. 		REQ_TimeOutSecs,	Timer,
  20. 		REQ_GadgetText,		Gadgets,
  21. 		REQ_StayOnTop,		TRUE,
  22. 	TAG_END)))
  23. 		return(-99);
  24. 	Result=DoMethod(Requester,RM_OPENREQ,NULL,Window,NULL);
  25. 	DisposeObject(Requester);
  26.  
  27. 	// Timer? Result==-1
  28.  
  29. 	return(Result);
  30. }
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Mon, 2015-03-16 13:37
salass00
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Last seen: 6 months 2 weeks ago
Joined: 2011-02-03 11:27
You're using linear varargs

You're using linear varargs but vsprintf() expects normal varargs.

Also you should use vsnprintf() instead of vsprintf() to protect against buffer overflows.

  1. int32 SAK_EasyRequest(Object *WinObject, struct Window *Window, STRPTR Title,
  2.     int32 ImageType, struct Image *Image, STRPTR Text, uint32 Timer,
  3.     STRPTR Gadgets, ...)
  4. {
  5.     Object *Requester;
  6.     int32   Result;
  7.     char    VABuffer[1024];
  8.     va_list VarArgs;
  9.  
  10.     va_start(VarArgs, Gadgets);
  11.     vsnprintf(VABuffer, sizeof(VABuffer), Text, VarArgs);
  12.     va_end(VarArgs);
  13.  
  14.     if (!(Requester=RequesterObject,
  15.         REQ_TitleText,   Title,
  16.         REQ_Type,        0,
  17.         REQ_Image,       ImageType ? REQIMAGE_ERROR : REQIMAGE_INFO,
  18.         REQ_BodyText,    VABuffer,
  19.         REQ_WrapBorder,  35,
  20.         REQ_TimeOutSecs, Timer,
  21.         REQ_GadgetText,  Gadgets,
  22.         REQ_StayOnTop,   TRUE,
  23.     TAG_END)))
  24.         return(-99);
  25.     Result=DoMethod(Requester,RM_OPENREQ,NULL,Window,NULL);
  26.     DisposeObject(Requester);
  27.  
  28.     // Timer? Result==-1
  29.  
  30.     return Result;
  31. }
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Mon, 2015-03-16 17:16
mritter0
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Last seen: 2 years 6 months ago
Joined: 2014-04-21 21:15
That is the way I originally

That is the way I originally had it; it worked that way. I was looking around here and everyone was using the linear code so I switched to that thinking it was "the new OS4 way to do it."

What is the difference? When do you use that?

Thanks

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