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what is this ?

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going through a code sample I came around this syntax new to me which I don't understand..

Code:

for (;;)
                {
                        c = *pstrstr;

                        if (c >= '0' && c <= '9')c -= '0';
                    //.......
              }

for ( ;; ) what does the double semicolon means in this for loop?
thanks

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