ASPrintf or VSNPrintf

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Mon, 2020-02-17 19:02
#1
jabirulo
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Joined: 2013-05-30 00:53
ASPrintf or VSNPrintf

Hi use this piece of code:

  1. ...
  2. if(dd->infowin_autosave) {
  3. 	char textbuf[16];
  4.  
  5. 	SNPrintf(textbuf, sizeof(textbuf), "%ld",dd->winX);
  6. 	saveDockyToolType(dd->GFXDock_ExePath, "WINX", textbuf);
  7. 	SNPrintf(textbuf, sizeof(textbuf), "%ld",dd->winY);
  8. 	saveDockyToolType(dd->GFXDock_ExePath, "WINY", textbuf);
  9. }
  10. ...

would be "better" to use ASPrintf instead?

  1. ...
  2. if(dd->infowin_autosave) {
  3. 	STRPTR textbuf;
  4.  
  5. 	textbuf = ASPrintf("%ld",dd->winX);
  6. 	saveDockyToolType(dd->GFXDock_ExePath, "WINX", textbuf);
  7. 	textbuf = ASPrintf("%ld",dd->winY);
  8. 	saveDockyToolType(dd->GFXDock_ExePath, "WINY", textbuf);
  9. 	FreeVec(textbuf);
  10. }
  11. ...
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Mon, 2020-02-17 19:35
thomas
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Joined: 2011-05-16 14:23
Re: ASPrintf or VSNPrintf

Your usage of ASPrintf is bad because it leaks memory. Each call to ASPrintf allocates a new buffer and you have to free them all, not only the last one.

That's also the reason why I would recommend SNPrintf in your case. Allocating and freeing a new buffer each time is quite a bit of overhead which can be saved if you use SNPrintf and reuse one buffer.

The main question is how saveDockyToolType deals with the text buffer. I suppose it copies its contents so that you can indeed reuse the buffer after each call.

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Mon, 2020-02-17 20:43
(Reply to #2)
jabirulo
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Re: ASPrintf or VSNPrintf

Ooops,. you're tight I missed one FreeVec(().

And thx that what I wanted to know if it's too overhead for so tiny strings/piece of code.

Yes IIRC saveDockyTooltType() makes acopy of data I'm passing.
Not sure, but maybe such function/code was done by you or anyone on this forum ;-):

  1. void saveDockyToolType(STRPTR iconname, STRPTR ttpName, STRPTR ttpArg)
  2. {
  3.  STRPTR *oldttp = NULL;
  4.  int i;
  5.  char newttp[1024], ttpBuf1[64]="", ttpBuf2[64]="";
  6.  struct DiskObject *micon = NULL;
  7. //DBUG("START SaveToolType()\n");
  8.  if(ttpArg)
  9.  {
  10.   SNPrintf(newttp, sizeof(newttp), "%s=",ttpName); // "<tooltype>="
  11.   SNPrintf(ttpBuf2, sizeof(ttpBuf2), "(%s=",ttpName); // BUF2 = "(<tooltype>="
  12.  
  13.   Strlcpy( ttpBuf1, newttp, sizeof(ttpBuf1) ); // BUF1 = NEWTTP
  14.  }
  15.  
  16.  //Strlcpy( ttpBuf1, newttp, sizeof(ttpBuf1) ); // BUF1 = NEWTTP
  17.  
  18.  micon = GetDiskObject(iconname);
  19.  if(micon)
  20.  {
  21.   for(i = 0; micon->do_ToolTypes<em> != NULL; i++) // parse tooltypes
  22.   {
  23. //DBUG("%2ld'%s'\n",i,micon->do_ToolTypes<em>);
  24.    if( !Strnicmp(micon->do_ToolTypes<em>, ttpBuf1, Strlen(ttpBuf1))
  25.       || !Strnicmp(micon->do_ToolTypes<em>, ttpBuf2, Strlen(ttpBuf2)) )
  26.    {// Found tooltype
  27.     Strlcat( newttp, ttpArg, sizeof(newttp) );
  28. //DBUG("'%s' == '%s'?\n",micon->do_ToolTypes<em>,newttp);
  29.     // Normal case tooltype -> tooltype=value OR (tooltype=value)
  30.     if( ttpArg && Stricmp(micon->do_ToolTypes<em>, newttp) )
  31.     {// Tooltype loaded diffs. from icon's tooltype -> modify tooltype and END
  32.      oldttp = micon->do_ToolTypes;
  33.      micon->do_ToolTypes<em> = newttp;
  34.      PutDiskObject(iconname, micon);
  35.      micon->do_ToolTypes = oldttp;
  36. //DBUG("Tooltype modified: '%s'\n",newttp);
  37.     }
  38.     break;
  39.  
  40.    } // END if( !Strnicmp(micon->..
  41.   } // END for
  42.  
  43.   if(!micon->do_ToolTypes<em>)
  44.   {// No tooltype -> create tooltype entry and END
  45. //DBUG("Tooltype '%s' NOT found (i=%ld)\n",newttp,i);
  46.    Strlcat( newttp, ttpArg, sizeof(newttp) );
  47.    oldttp = micon->do_ToolTypes;
  48.    STRPTR *newtts = AllocVecTags( (i+2)*sizeof(STRPTR), TAG_DONE );
  49.    CopyMem(oldttp, newtts, i*sizeof(STRPTR) ); // clone tooltypes
  50.    newtts<em> = newttp;
  51.    newtts[i+1] = NULL;
  52.    micon->do_ToolTypes = newtts;
  53.    PutDiskObject(iconname, micon);
  54.    micon->do_ToolTypes = oldttp;
  55.    FreeVec(newtts);
  56. //DBUG("Tooltype created: '%s'\n",newttp);
  57.   }
  58.  
  59.   FreeDiskObject(micon);
  60.  }
  61.  
  62. //DBUG("END SaveToolType()\n");
  63. }

THX

AOS4.1/SAM460ex/PPC460EX-1155MHZ/2048MB/RadeonHD6570/SSD120GB/DVDRW :-P

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