🚀 go-pugleaf

make dumps core when values are omitted to flags e.g.:
make -j
Segmentation fault (dump saved in "core")

This occurs in the case where you have a flag with an optional numerical
argument as last argument on the command line. This only occurs on systems
that doesn't allow references of address zero (eg. Sun).

The fix is simple:


*** make.c.org	Mon Feb 20 12:46:24 1989
--- make.c	Mon Feb 20 13:00:15 1989
***************
*** 847,853 ****
  		    case positive_int:
  		      if (*sw == '\0')
  			sw = argv[++i];
! 		      if (isdigit (*sw))
  			{
  			  int i = atoi (sw);
  			  while (isdigit (*sw))
--- 847,853 ----
  		    case positive_int:
  		      if (*sw == '\0')
  			sw = argv[++i];
! 		      if (sw && isdigit (*sw))
  			{
  			  int i = atoi (sw);
  			  while (isdigit (*sw))
***************
*** 888,894 ****
  		    case floating:
  		      if (*sw == '\0')
  			sw = argv[++i];
! 		      if (*sw == '.' || isdigit (*sw))
  			{
  			  *(double *) cs->value_ptr = atof (sw);
  			  while (*sw == '.' || isdigit (*sw))
--- 888,894 ----
  		    case floating:
  		      if (*sw == '\0')
  			sw = argv[++i];
! 		      if (sw && (*sw == '.' || isdigit (*sw)))
  			{
  			  *(double *) cs->value_ptr = atof (sw);
  			  while (*sw == '.' || isdigit (*sw))