[Internet Bully]

PHP Code:

public CenterString(const String:str[], String:output[], maxlength)
{
    new length = strlen(str);
    new size     = maxlength;
    new String:newstr[size];
    new firstspace = RoundToCeil((size-length)/2.0);
    new secondspace = RoundToFloor((size-length)/2.0);
    
    for(new i=0; i < firstspace; i++)
    {    
        newstr[i] = ' '; // change this if you want to center with non-whitespace
    }
    
    StrCat(newstr, size, str);
    
    for(new j=length+firstspace; j < length+firstspace+secondspace; j++)
    {    
        newstr[j] = ' '; // change this if you want to center with non-whitespace
    }
    
    strcopy(output, maxlength, newstr);
} 


Useful if you're printing text and want it centered, also not a bad example of how to use a buffer to return strings.

Example:

PHP Code:

new String:test[32]; 
strcopy(test, sizeof(test), "Centering");
CenterString(test, test, sizeof(test)); 


returns:

PHP Code:

 "            Centering           " 


[KyleS]

PHP Code:

stock CenterString(String:sBuffer[], outlen, const String:sInput[], inlen = -1)
{
    static const String:sTokenHack[] = "%%%us%%s%%%us";
    decl String:sTempBuff[24];

    if (inlen == -1)
    {
        inlen = strlen(sInput);
    }

    inlen = (outlen >> 1) - (inlen >> 1);

    FormatEx(sTempBuff, sizeof(sTempBuff), sTokenHack, inlen, inlen);
    return Format(sBuffer, outlen, sTempBuff, "", sInput, "");
} 


atcprintf doesn't appear to support %*s, so we have that horrible static const at the top (and double format). Anyways, hopefully this helps someone