pcre_info.c   [plain text]


/*************************************************
*      Perl-Compatible Regular Expressions       *
*************************************************/

/* PCRE is a library of functions to support regular expressions whose syntax
and semantics are as close as possible to those of the Perl 5 language.

                       Written by Philip Hazel
           Copyright (c) 1997-2009 University of Cambridge

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*/


/* This module contains the external function pcre_info(), which gives some
information about a compiled pattern. However, use of this function is now
deprecated, as it has been superseded by pcre_fullinfo(). */


#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "pcre_internal.h"


/*************************************************
* (Obsolete) Return info about compiled pattern  *
*************************************************/

/* This is the original "info" function. It picks potentially useful data out
of the private structure, but its interface was too rigid. It remains for
backwards compatibility. The public options are passed back in an int - though
the re->options field has been expanded to a long int, all the public options
at the low end of it, and so even on 16-bit systems this will still be OK.
Therefore, I haven't changed the API for pcre_info().

Arguments:
  argument_re   points to compiled code
  optptr        where to pass back the options
  first_byte    where to pass back the first character,
                or -1 if multiline and all branches start ^,
                or -2 otherwise

Returns:        number of capturing subpatterns
                or negative values on error
*/

PCRE_EXP_DEFN int PCRE_CALL_CONVENTION
pcre_info(const pcre *argument_re, int *optptr, int *first_byte)
{
real_pcre internal_re;
const real_pcre *re = (const real_pcre *)argument_re;
if (re == NULL) return PCRE_ERROR_NULL;
if (re->magic_number != MAGIC_NUMBER)
  {
  re = _pcre_try_flipped(re, &internal_re, NULL, NULL);
  if (re == NULL) return PCRE_ERROR_BADMAGIC;
  }
if (optptr != NULL) *optptr = (int)(re->options & PUBLIC_COMPILE_OPTIONS);
if (first_byte != NULL)
  *first_byte = ((re->flags & PCRE_FIRSTSET) != 0)? re->first_byte :
     ((re->flags & PCRE_STARTLINE) != 0)? -1 : -2;
return re->top_bracket;
}

/* End of pcre_info.c */