#include <stdlib.h>
#include <string.h>

/*  The value of an environment variable can change, so getenv(name)
 *  for fixed name may have different values at different program
 *  points.
 */
char * lang_struct_rpntc(char *name, char str[128]){
  char *c;       
  const char *cc;
  
  c = getenv(name);        /* 'Returned Pointer Not Treated as const' warning issued here.
                            * The code does not subsequently mutate *c, but future changes could
                            * introduce a mutation without causing compilation errors.
                            * Use a const-qualified variable to prevent this.
                            */
  if (!c){return NULL;}
  cc = getenv(name);                       /* ok: const-qualified pointer type */
  if (!cc){return NULL;}
  
  getenv(name)[0] = 'X';   /* 'Returned Pointer Not Treated as const' warning issued here
                            * ('Null Pointer Dereference' warning also issued: getenv() may return NULL)
                            */ 

  return strncpy(str, getenv(name), 127);  /* no 'Returned Pointer Not Treated as const' warning
                                            * - strcpy type signature is
                                            * char *strncpy (char *, const char *, size_t)
                                            */
                            /* ('Null Pointer Dereference' warning issued: getenv() may return NULL) */ 
}