strcmp problem

Deji · 22-11-2010 20:26

I'm working on a script to add extra settings to the stream.ini file, which will support CLEO 3 and CLEO 4 (at the moment I'm using CLEO 4 for ease and debugging).

Pretty well-optimized script as it uses mostly functions. I'm not sure all of it works yet, but the first problem I've noticed is calling 0x8229B6 (strcmp)

{$CLEO}
wait 2
0A9A:   0@ = openfile "stream.ini" mode 0x72  // use CLEO 3 open mode
else_jump @End
0AC6: 2@ = label @aFrameDelay offset
 
:ScanFile
while true
    wait 0
    0AA7: call_function 0x536F80 num_params 1 pop 1 0@ 1@  // write the next line of stream.ini to 0xB71848
    8039:   not 1@ == 0  // above function returns "0xB71848" if it was successful
    jf break
    0AA7: call_function 0x8229B6 num_params 2 pop 2 0xB71848 2@ 1@  // thread memory used for CLEO 3 support, "framedelay" instead of 2@ produces same results
    0ACE: show_formatted_text_box "%d" 1@
    wait 2000
    0039:   1@ == 2  // I'll set back to 1 later, this is for debugging
    else_jump @ScanFile
    0AA7: call_function 0x82258E num_params 1 pop 1 0xB71852 1@
    0A8C: write_memory 0x53E94C size 1 value 1@ virtual_protect 1
    break
end
0A9B: closefile 0@
:End
0A93: end_custom_thread
 
:aFrameDelay
hex
"framedelay" 00
end

stream.ini

framedelay  5
memory      600000
devkit_memory   600000
vehicles    12
pe_lightchangerate  0.0008
pe_lightingbasecap  0.35
pe_lightingbasemult 0.4
pe_leftx    16
pe_topy     16
pe_rightx   16
pe_bottomy  16
pe_bRadiosity    1
dontbuildpaths

The problem is, the function returns -1 on the line which contains "framedelay". However, on the lines which contain "dontbuildpaths" and "devkit_memory" return 1. I see no reason why this is happening.

listener · 23-11-2010 08:46

stricmp compares entire string, including trailing '\0'. It returns -1 if string1 < string2; 1, if string1 > string2 or 0 if strings are equal.

"framedelay" < "framedelay 5", because '\0' < ' '. So, stricmp returns -1
"framedelay" > "dontbuildpaths", because 'f' > 'd'

You shold use _strnicmp (0x835AC7) with exact length of the string, e.g., strnicmp ("framedelay", szLineBuf, 10);

Deji · 23-11-2010 16:45

Thanks for that.

After finding out IDA has a "pseudocode" feature I noticed it uses strtok first. By the looks of the C++ Reference, this is something else I need (since it can automatically separate strings by spaces/tabs). I've often thought sscanf was the only way of doing something like this.

for ( i = CFileMgr_getConfigLine(v3); i; i = CFileMgr_getConfigLine(v2) )
 {
   if ( *(_BYTE *)i != '#' )
   {
     if ( *(_BYTE *)i )
     {
       v5 = strtok((char *)i, " ,\t");
       v4 = strtok(0, " ,\t");
       if ( stricmp(v5, "memory") || v1 )
       {
         if ( stricmp(v5, "devkit_memory") )
         {
           [...]
         }
         else
         {
           dword_8A5A80 = atoi(v4) << 10;
           v1 = 1;
         }
       }
       else
       {
         dword_8A5A80 = atoi(v4) << 10;
       }
     }
   }
 }

It's much easier to keep track of the variables this way.

Working Code

{$CLEO}
wait 2
0A9A:   0@ = openfile "stream.ini" mode 0x72
else_jump @End
0AC6: 3@ = label @aFrameDelay offset
0AC7: 4@ = var 5@ offset
 
:ScanFile
while true
    wait 0
    0AA7: call_function 0x536F80 num_params 1 pop 1 0@ 1@
    8039:   not 1@ == 0
    jf break
    0A8D: 2@ = read_memory 1@ size 1 virtual_protect 0
    8039:   not 2@ == 0x23
    jf break
    0AA7: call_function 0x82244B num_params 2 pop 2 0x86A8C8 1@ 1@
    0AA7: call_function 0x82244B num_params 2 pop 2 0x86A8C8 0 4@
    0AA7: call_function 0x8229B6 num_params 2 pop 2 1@ 3@ 2@
    0039:   2@ == 0
    else_jump @ScanFile
    0AA7: call_function 0x82258E num_params 1 pop 1 4@ 2@
    0A8C: write_memory 0x53E94C size 1 value 2@ virtual_protect 1
    break
end
0A9B: closefile 0@
:End
0A93: end_custom_thread
 
:aFrameDelay
hex
"framedelay" 00
end

Now I'll work on adding all sorts of settings to this file. Probably to do with optimisation and graphics in order to keep the stream.ini's original purpose. Since I don't know of too many memory locations of this stuff yet, I better start digging... Thanks for the help.

SannyBuilder.com Forums

#1 22-11-2010 20:26

strcmp problem

#2 23-11-2010 08:46

Re: strcmp problem

#3 23-11-2010 16:45

Re: strcmp problem

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