[xml] xmlregexp progressive regexp evaluation usage.

[Alberto González Palomo <matmota matracas org>]

	I'm using libxml2 (version 2.5.3) for a new program, and I'd like
to use xmlregexp for the tokenizer I'll need.
	xmlRegexpExec() works fine. GCC is 2.95.4. I'm not using any -O*.

	However, I can't get the progressive evaluation to work, even
after looking at all places where I found it in libxml2's source code.

	First, "exec" is a compiled regexp from "a+". (I've tried other
expressions, with the same results)

  xmlRegExecCtxtPtr exec = xmlRegNewExecCtxt(regexp, NULL, NULL);
  result = xmlRegExecPushString(exec, (xmlChar*)"a", NULL);

	"exec" is non-null.
	"result" is always -1.

	After these lines, doing xmlRegexpExec(regexp, (xmlChar*)"a")
returns 1.


	Could you tell me what I'm missing?

	Thanks,
--
	Alberto González Palomo
	Toledo, Spain.