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BUG in function parameter passing ??????

    This is a little C program which demonstrates a little problem 
    with CYGNUS32. This code works fine on a DigitalUnix, but breaks under
    Cygwin. I do not know if it is a cygwin problem or if it is a C problem.
    The symptom is a segmentation violation in strtolower.
    The SEGVIOL is always at the tolower. I found that tolower does not
    matter, what matters is that I want to change the value of the string
    passed in. 

    If it is a real problem and not my bad understanding of C then it must
    have to do with the way parameters are allocated on the stack when
    calling a function. This sounds like very deep in the belly of cygwin or
    the gcc compiler.
    Please mail your ideas to:
    Please mail, as I do not monitor this mailing list due to time constraints
    and my irregular use of the Cygwin tools. I almost forgot: the version
    is Cygwinb19.1 on a Windows-NT workstation 4.0 with a Pentium.            

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <ctype.h>
  void strtolower(char *pText)
    int i;
    char *pPtr;
    for(i = 0, pPtr = pText; i < strlen(pText); i++, pPtr++)
      *pPtr = tolower(*pPtr);

int main(int argc, char *argv[])
  char pBuffer[132];
  /* why does this work? */
  strcpy(pBuffer,"Hello You");
  /* but this gives a segmentation violation under Cygwin*/
  strtolower("Hello You");
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