} else {
	    return "ERROR";
	  }
        }
        jvmidx = nextIdx;
        jvmtype = knownVMs[jvmidx].name+1;
	loopCount++;
      }
    }

    switch (knownVMs[jvmidx].flag) {
    case VM_WARN:
        if (!speculative) {
	    fprintf(stderr, "Warning: %s VM not supported; %s VM will be used\n", 
		    jvmtype, knownVMs[0].name + 1);
        }
	/* fall through */
    case VM_IGNORE:
	jvmtype = knownVMs[jvmidx=0].name + 1;
	/* fall through */
    case VM_KNOWN:
	break;
    case VM_ERROR:
        if (!speculative) {
	    ReportErrorMessage2("Error: %s VM not supported", jvmtype, JNI_TRUE);
	    exit(1);
        } else {
	    return "ERROR";
        }
    }

    return jvmtype;
}

# define KB (1024UL)
# define MB (1024UL * KB)
# define GB (1024UL * MB)

/* copied from HotSpot function "atomll()" */
static int
parse_stack_size(const char *s, jlong *result) {
  jlong n = 0;
  int args_read = sscanf(s, jlong_format_specifier(), &n);
  if (args_read != 1) {
    return 0;
  }
  while (*s != '\0' && *s >= '0' && *s <= '9') {
    s++;
  }
  // 4705540: illegal if more characters are found after the first non-digit
  if (strlen(s) > 1) {
    return 0;
  }
  switch (*s) {
    case 'T': case 't':
      *result = n * GB * KB;
      return 1;
    case 'G': case 'g':
      *result = n * GB;
      return 1;
    case 'M': case 'm':
      *result = n * MB;
      return 1;
    case 'K': case 'k':
      *result = n * KB;
      return 1;
    case '\0':
      *result = n;
      return 1;
    default:
      /* Create JVM with default stack and let VM handle malformed -Xss string*/
      return 0;
  }
}

/*
 * Adds a new VM option with the given given name and value.
 */
void
AddOption(char *str, void *info)
{
    /*
     * Expand options array if needed to accommodate at least one more
     * VM option.
     */
    if (numOptions >= maxOptions) {
	if (options == 0) {
	    maxOptions = 4;
	    options = JLI_MemAlloc(maxOptions * sizeof(JavaVMOption));
	} else {
	    JavaVMOption *tmp;
	    maxOptions *= 2;
	    tmp = JLI_MemAlloc(maxOptions * sizeof(JavaVMOption));
	    memcpy(tmp, options, numOptions * sizeof(JavaVMOption));
	    JLI_MemFree(options);
	    options = tmp;
	}
    }
    options[numOptions].optionString = str;
    options[numOptions++].extraInfo = info;