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/* This testcase would cause a hang in PTA solving due to a complex copy

   constraint and marking the wrong variable as changed.  */

typedef struct RExC_state_t

{

 char *end;

 char *parse;

} RExC_state_t;

struct regnode_string

{

 unsigned char str_len;

 char string[1];

};

static void *regatom (RExC_state_t * pRExC_state, int *flagp);

static void *

regpiece (RExC_state_t * pRExC_state, int *flagp)

{

 return regatom (0, 0);

}

static void *

regbranch (RExC_state_t * pRExC_state, int *flagp, int first)

{

 return regpiece (0, 0);

}

static void *

reg (RExC_state_t * pRExC_state, int paren, int *flagp)

{

 return regbranch (0, 0, 1);

}

void *

Perl_pregcomp (char *exp, char *xend, void *pm)

{

 return reg (0, 0, 0);

}

static void *

regatom (RExC_state_t * pRExC_state, int *flagp)

{

 register void *ret = 0;

 int flags;

tryagain:

 switch (*(pRExC_state->parse))

   {

   case '(':

     ret = reg (pRExC_state, 1, &flags);

     if (flags & 0x8)

       {

         goto tryagain;

       }

     break;

   default:

 {

       register unsigned long len;

       register unsigned ender;

       register char *p;

       char *oldp, *s;

       unsigned long numlen;

       unsigned long foldlen;

       unsigned char tmpbuf[6 + 1], *foldbuf;

     defchar:

       s = (((struct regnode_string *) ret)->string);

       for (len = 0, p = (pRExC_state->parse) - 1;

            len < 127 && p < (pRExC_state->end); len++)

         {

           if (((*p) == '*' || (*p) == '+' || (*p) == '?'

                || ((*p) == '{' && regcurly (p))))

             {

               unsigned long unilen;

               for (foldbuf = tmpbuf; foldlen; foldlen -= numlen)

                 {

                   reguni (pRExC_state, ender, s, &unilen);

                   s += unilen;

                 }

               break;

             }

           unsigned long unilen;

           reguni (pRExC_state, ender, s, &unilen);

           s += unilen;

         }

     };

     break;

   }

 return (ret);

}