Path: utzoo!attcan!uunet!husc6!cmcl2!rutgers!ucsd!ucbvax!dewey.soe.berkeley.edu!oster
From: oster@dewey.soe.berkeley.edu (David Phillip Oster)
Newsgroups: comp.sys.mac.programmer
Subject: Re: LSC 3.0 scanf deletes
Keywords: delete, scanf
Message-ID: <25510@ucbvax.BERKELEY.EDU>
Date: 7 Aug 88 02:10:43 GMT
References: <2559@pt.cs.cmu.edu> <587@helios.ee.lbl.gov>
Sender: usenet@ucbvax.BERKELEY.EDU
Reply-To: oster@dewey.soe.berkeley.edu.UUCP (David Phillip Oster)
Organization: School of Education, UC-Berkeley
Lines: 74

In article <587@helios.ee.lbl.gov> beard@ux1.lbl.gov (Patrick C Beard) writes:
>{
>	float in_value;
>	char buf[80];	/* overconservative */
>
>	printf("enter ... ");
>	gets(buf);	/* user can use backspace to edit */
>	sscanf(buf,"%f",&in_value);
>	return(in_value);
>}

Are you from the moon? Why would anyone want to do such a silly thing?

The correct solution is:

#if MAC

#include <DialogMgr.h>
#define TEXTITEM 3

/* GetDIHandle - return handle from current dialog item
 */
Handle GetDIHandle(item)short item;{
   short type;
   Handle hand;
   Rect r;

   GetDItem(thePort, item, &type, &hand, &r);
   return hand;
}

/* foo- get a floating point number from the user
 */
float foo(){
    float f;
    Str255 s;

    SetPort(GetNewDialog(FLOAT1, NIL, -1L));
    for(;;){
	ModalDialog(NIL, &item);
	switch(item){
	case OK:
		GetIText(GetDIHandle(TEXTITEM), s);
		PtoCstr( (char *) s);
		if(1 != sscanf(s,"%f", &f) || OutOfBounds(f)){
		/* bad number, beep and reselect */
		    SysBeep(1);
		    SelIText(thePort, TEXTITEM, 0, 9999);
		    break;
		}
		DisposDialog(thePort);
		return f;	/* user wants out */
	case Cancel:
		DisposDialog(thePort);
		return BADFLOAT;	/* user wants out */
	}
    }
}
/*
Where FLOAT1 is the resource id of a dialog with an okay button as item 1, 
a cancel button as item 2, 
an edit text box as item 3, 
and a prompt statictext string as item 4.
Just create it in ResEdit.
 */
#else
... whatever ludicrous nonsense you have to do on other machines
#endif

Get with it guys, this is Macintosh, not some 1960's vintage teletype.

--- David Phillip Oster            --When you asked me to live in sin with you
Arpa: oster@dewey.soe.berkeley.edu --I didn't know you meant sloth.
Uucp: {uwvax,decvax,ihnp4}!ucbvax!oster%dewey.soe.berkeley.edu