Very Computer

     Hello,

     I am having a problem with what looks like an uninitialized call stack on Solaris 5.5.1 while
     using a variable argument list function.   An example program is at the end of this message.
     The program was compiled with g++.

     Incorrectly, both finalArray1 and finalArray2 receive the string "Hello".  When I debugged it,
     I found the second invocation of bundle_args was picking up the stack variables
     from the previous call.

     When I compiled and ran this on an hpux10 machine, it worked correctly.

     Anyone seen this before?  If so, any work-arounds?  (I can pass "0" as a third parameter, but
     this is kind of kludgy).

     Thanks,

     Pat Griffin

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>

char **
bundle_args(char *header, int iter, ...)
{
   va_list listPtr = NULL;

   int i = 0;
   int num = 0;

   char **charArray = NULL;
   char **arrayPtr = NULL;
   char *arg = NULL;

   va_start(listPtr, iter);

   num = va_arg(listPtr, int);
   if (num)
   {
      charArray = (char **)calloc(num + 1, sizeof(char *));
      arrayPtr = charArray;

      printf ("%s, iteration %d\n", header, iter);

      for (i = 0; i < num; i++)
      {
  arg = va_arg(listPtr, char *);
  *arrayPtr = (char *)malloc(strlen(arg) + 1);
         strcpy(*arrayPtr, arg);
         arrayPtr++;
      }
      *arrayPtr = NULL;
   }
   va_end(listPtr);
   return(charArray);

Quote:}

main()
{
   char name1[] = "Hello";

   char **finalArray = NULL;
   char **finalArray2 = NULL;

   char **finalPtr = NULL;

   finalArray = bundle_args("We are in bundle_args", 1, 1,
       name1);
   finalArray2 = bundle_args("We are in bundle_args", 2);

   finalPtr = finalArray;
   while (*finalPtr != NULL)
      printf("%s ", *finalPtr++);
   printf("\n");

   finalPtr = finalArray2;
   while (*finalPtr != NULL)
      printf("%s ", *finalPtr++);
   printf("\n");

Quote:}