Function ap_regcomp

server/util_pcre.c:202–252

* Arguments: * preg points to a structure for recording the compiled expression * pattern the pattern to compile * cflags compilation flags * * Returns: 0 on success * various non-zero codes on failure */

 *               various non-zero codes on failure
*/
AP_DECLARE(int) ap_regcomp(ap_regex_t * preg, const char *pattern, int cflags)
{
#ifdef HAVE_PCRE2
    uint32_t capcount;
    size_t erroffset;
#else
    const char *errorptr;
    int erroffset;
#endif
    int errcode = 0;
    int options = PCREn(DUPNAMES);

    if ((cflags & AP_REG_NO_DEFAULT) == 0)
        cflags |= default_cflags;

    if ((cflags & AP_REG_ICASE) != 0)
        options |= PCREn(CASELESS);
    if ((cflags & AP_REG_NEWLINE) != 0)
        options |= PCREn(MULTILINE);
    if ((cflags & AP_REG_DOTALL) != 0)
        options |= PCREn(DOTALL);
    if ((cflags & AP_REG_DOLLAR_ENDONLY) != 0)
        options |= PCREn(DOLLAR_ENDONLY);

#ifdef HAVE_PCRE2
    preg->re_pcre = pcre2_compile((const unsigned char *)pattern,
                                  PCRE2_ZERO_TERMINATED, options, &errcode,
                                  &erroffset, NULL);
#else
    preg->re_pcre = pcre_compile2(pattern, options, &errcode,
                                  &errorptr, &erroffset, NULL);
#endif

    preg->re_erroffset = erroffset;
    if (preg->re_pcre == NULL) {
        /* Internal ERR21 is "failed to get memory" according to pcreapi(3) */
        if (errcode == 21)
            return AP_REG_ESPACE;
        return AP_REG_INVARG;
    }

#ifdef HAVE_PCRE2
    pcre2_pattern_info((const pcre2_code *)preg->re_pcre,
                       PCRE2_INFO_CAPTURECOUNT, &capcount);
    preg->re_nsub = capcount;
#else
    pcre_fullinfo((const pcre *)preg->re_pcre, NULL,
                  PCRE_INFO_CAPTURECOUNT, &(preg->re_nsub));
#endif
    return 0;
}