Key mangling, and elliptic curves.

[catacomb-perl] / utils.c

/* -*-c-*-
 *
 * $Id$
 *
 * Utilities for Catacomb/Perl
 *
 * (c) 2001 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of the Perl interface to Catacomb.
 *
 * Catacomb/Perl is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * Catacomb/Perl is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Catacomb/Perl; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*----- Header files ------------------------------------------------------*/

#include "catacomb-perl.h"

/*----- Main code ---------------------------------------------------------*/

U32 findconst(const struct consttab *cc, const char *pkg, const char *name)
{
  const char *p;
  if ((p = strrchr(name, ':')) != 0)
    name = p + 1;
  while (cc->name) {
    if (strcmp(cc->name, name) == 0)
      return (cc->val);
    cc++;
  }
  croak("unknown %s constant `%s'", pkg, name);
}

void ptrtosv(SV **sv, void *p, const char *type)
{
  if (p)
    sv_setref_pv(*sv, type, (void *)p);
  else
    *sv = &PL_sv_undef;
}

void *ptrfromsv(SV *sv, const char *type, const char *what, ...)
{
  if (!sv_derived_from(sv, type)) {
    va_list ap;
    SV *t = sv_newmortal();
    va_start(ap, what);
    sv_vsetpvfn(t, what, strlen(what), &ap, 0, 0, 0);      
    croak("%s is not of type %s", SvPVX(t), type);
  }
  return (void *)SvIV((SV *)SvRV(sv));
}

/*----- That's all, folks -------------------------------------------------*/