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(libc.info)strfry

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strfry
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   The function below addresses the perennial programming quandary:
"How do I take good data in string form and painlessly turn it into
garbage?"  This is actually a fairly simple task for C programmers who
do not use the GNU C library string functions, but for programs based
on the GNU C library, the `strfry' function is the preferred method for
destroying string data.

   The prototype for this function is in `string.h'.

 - Function: char * strfry (char *STRING)
     `strfry' creates a pseudorandom anagram of a string, replacing the
     input with the anagram in place.  For each position in the string,
     `strfry' swaps it with a position in the string selected at random
     (from a uniform distribution).  The two positions may be the same.

     The return value of `strfry' is always STRING.

     *Portability Note:*  This function is unique to the GNU C library.