shared storage for string literals?

[Steve Vegdahl]

The ANSI standard states that two identical string literals may share storage.
Thus, whether the execution of the block:
  { char *a = "hello";
    char *b = "hello";
    printf("%s", a==b ? "YES" : "NO");
  }
prints "YES" is depends on the implementation.

Question: can non-identical substrings share storage if one is a substring
of the other, and they share a common "tail"?  In other words, is it legal
for an implementation to print "YES" when executing the following block:
  { char *a = "Say hello";
    char *b = "hello";
    printf("%s", (a+4)==b ? "YES" : "NO");
  }

I find nothing in the standard that gives a definitive answer to this question.

		Steve Vegdahl
		Adaptive Solutions, Inc.