Improve http2env's performance by cutting the work it has to

Changes with Apache 2.0.29-dev

  *) Improve http2env's performance by cutting the work it has to

     do.  [Brian Pane <bpane@pacbell.net>]

  *) use new 'apr_hash_merge' function in mod_mime (performance fix)

     [Brian Pane <bpane@pacbell.net>]

#define MALFORMED_MESSAGE "malformed header from script. Bad header="

#define MALFORMED_HEADER_LENGTH_TO_SHOW 30

static char *http2env(apr_pool_t *a, char *w)

static char *http2env(apr_pool_t *a, const char *w)

{

    char *res = apr_pstrcat(a, "HTTP_", w, NULL);

    char *res = (char *)apr_palloc(a, sizeof("HTTP_") + strlen(w));

    char *cp = res;

    char c;

    while (*++cp) {

	if (!apr_isalnum(*cp) && *cp != '_') {

	    *cp = '_';

    *cp++ = 'H';

    *cp++ = 'T';

    *cp++ = 'T';

    *cp++ = 'P';

    *cp++ = '_';

    while ((c = *w++) != 0) {

        if (!apr_isalnum(c)) {

            *cp++ = '_';

        }

        else {

	    *cp = apr_toupper(*cp);

            *cp++ = apr_toupper(c);

        }

    }

    *cp = 0;

    return res;

}