chiark - git - mdw - catacomb-python/blob - util.c

   1 /* -*-c-*-
   2  *
   3  * Miscellaneous utilities (not Catacomb-specific)
   4  *
   5  * (c) 2005 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the Python interface to Catacomb.
  11  *
  12  * Catacomb/Python is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * Catacomb/Python is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with Catacomb/Python; if not, write to the Free Software Foundation,
  24  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 /*----- Header files ------------------------------------------------------*/
  28
  29 #include "catacomb-python.h"
  30
  31 /*----- External values ---------------------------------------------------*/
  32
  33 static PyObject *modname = 0;
  34
  35 /*----- Conversions -------------------------------------------------------*/
  36
  37 PyObject *getulong(unsigned long w)
  38 {
  39   if (w <= LONG_MAX)
  40     return (PyInt_FromLong(w));
  41   else
  42     return (PyLong_FromUnsignedLong(w));
  43 }
  44
  45 static PyObject *i32 = 0;
  46 static int init_i32(void)
  47   { if (!i32 && (i32 = PyInt_FromLong(32)) == 0) return (-1); return (0); }
  48
  49 PyObject *getk64(kludge64 u)
  50 {
  51   PyObject *i = 0, *j = 0, *t;
  52   PyObject *rc = 0;
  53
  54   if (init_i32()) goto end;
  55   if ((i = PyLong_FromUnsignedLong(HI64(u))) == 0) goto end;
  56   if ((t = PyNumber_InPlaceLshift(i, i32)) == 0) goto end;
  57   Py_DECREF(i); i = t;
  58   if ((j = PyLong_FromUnsignedLong(LO64(u))) == 0) goto end;
  59   if ((t = PyNumber_InPlaceOr(i, j)) == 0) goto end;
  60   Py_DECREF(i); i = t;
  61   if ((rc = PyNumber_Int(i)) == 0) goto end;
  62 end:
  63   if (i) Py_DECREF(i);
  64   if (j) Py_DECREF(j);
  65   return (rc);
  66 }
  67
  68 PyObject *getbool(int b)
  69 {
  70   if (b) RETURN_TRUE;
  71   else RETURN_FALSE;
  72 }
  73
  74 PyObject *abstract_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw)
  75 {
  76   PyErr_SetString(PyExc_TypeError, "can't instantiate this class");
  77   return (0);
  78 }
  79
  80 int convulong(PyObject *o, void *pp)
  81 {
  82   long i;
  83   unsigned long *p = pp;
  84   PyObject *t;
  85
  86   if (!o) VALERR("can't delete");
  87   if (PyInt_Check(o)) {
  88     i = PyInt_AS_LONG(o);
  89     if (i < 0) VALERR("must be nonnegative");
  90     *p = i;
  91   } else {
  92     if ((t = PyNumber_Long(o)) == 0) goto end;
  93     *p = PyLong_AsUnsignedLong(t);
  94     Py_DECREF(t);
  95     if (PyErr_Occurred()) goto end;
  96   }
  97   return (1);
  98 end:
  99   return (0);
 100 }
 101
 102 #define CONVU_(n)                                                       \
 103   int convu##n(PyObject *o, void *pp)                                   \
 104   {                                                                     \
 105     unsigned long u;                                                    \
 106     uint##n *p = pp;                                                    \
 107                                                                         \
 108     if (!convulong(o, &u)) goto end;                                    \
 109     if (u > MASK##n) VALERR("out of range");                            \
 110     *p = u;                                                             \
 111     return (1);                                                         \
 112   end:                                                                  \
 113     return (0);                                                         \
 114   }
 115 DOUINTSZ(CONVU_)
 116
 117 int convuint(PyObject *o, void *pp)
 118 {
 119   unsigned long u;
 120   unsigned *p = pp;
 121
 122   if (!convulong(o, &u)) goto end;
 123   if (u > UINT_MAX) VALERR("out of range");
 124   *p = u;
 125   return (1);
 126 end:
 127   return (0);
 128 }
 129
 130 int convk64(PyObject *o, void *pp)
 131 {
 132   PyObject *i = 0, *t;
 133   int rc = 0;
 134   uint32 lo, hi;
 135
 136   if (!o) VALERR("can't delete");
 137   if (init_i32()) goto end;
 138   if ((i = PyNumber_Int(o)) == 0) goto end;
 139   lo = PyInt_AsUnsignedLongMask(i);
 140   if ((t = PyNumber_InPlaceRshift(i, i32)) == 0) goto end;
 141   Py_DECREF(i); i = t;
 142   hi = PyInt_AsUnsignedLongMask(i);
 143   if ((t = PyNumber_InPlaceRshift(i, i32)) == 0) goto end;
 144   Py_DECREF(i); i = t;
 145   if (PyObject_IsTrue(i)) VALERR("out of range");
 146   SET64(*(kludge64 *)pp, hi, lo);
 147   rc = 1;
 148 end:
 149   if (i) Py_DECREF(i);
 150   return (rc);
 151 }
 152
 153 int convmpw(PyObject *o, void *pp)
 154 {
 155   unsigned long u;
 156   unsigned *p = pp;
 157
 158   if (!convulong(o, &u)) goto end;
 159   if (u > MPW_MAX) VALERR("out of range");
 160   *p = u;
 161   return (1);
 162 end:
 163   return (0);
 164 }
 165
 166 int convszt(PyObject *o, void *pp)
 167 {
 168   unsigned long u;
 169   size_t *p = pp;
 170
 171   if (!convulong(o, &u)) goto end;
 172   if (u > ~(size_t)0) VALERR("out of range");
 173   *p = u;
 174   return (1);
 175 end:
 176   return (0);
 177 }
 178
 179 int convbool(PyObject *o, void *pp)
 180 {
 181   if (!o) VALERR("can't delete");
 182   *(int *)pp = PyObject_IsTrue(o);
 183   return (1);
 184 end:
 185   return (0);
 186 }
 187
 188 /*----- Type messing ------------------------------------------------------*/
 189
 190 static const PyTypeObject emptytype = { 0 };
 191
 192 void *newtype(PyTypeObject *metaty,
 193               const PyTypeObject *skel,
 194               const char *name)
 195 {
 196   PyHeapTypeObject *ty =
 197     (PyHeapTypeObject *)_PyObject_GC_Malloc(_PyObject_VAR_SIZE(metaty, 0));
 198   if (!skel) skel = &emptytype;
 199   memcpy(ty, skel, sizeof(*skel));
 200   if (ty->ht_type.tp_base) Py_INCREF(ty->ht_type.tp_base);
 201 #define COPY(blah) do {                                                 \
 202     if (ty->ht_type.tp_as_##blah) {                                     \
 203       memcpy(&ty->as_##blah,                                            \
 204              ty->ht_type.tp_as_##blah,                                  \
 205              sizeof(ty->as_##blah));                                    \
 206       ty->ht_type.tp_as_##blah = &ty->as_##blah;                        \
 207     }                                                                   \
 208   } while (0)
 209   COPY(number);
 210   COPY(sequence);
 211   COPY(mapping);
 212   COPY(buffer);
 213 #undef COPY
 214   if (name)
 215     ty->ht_name = PyString_FromString(name);
 216   else if (ty->ht_type.tp_name)
 217     ty->ht_name = PyString_FromString(ty->ht_type.tp_name);
 218   if (ty->ht_name)
 219     ty->ht_type.tp_name = PyString_AS_STRING(ty->ht_name);
 220   DISCARD(PyObject_INIT(&ty->ht_type, metaty));
 221   Py_INCREF(metaty);
 222   return (ty);
 223 }
 224
 225 void typeready(PyTypeObject *ty)
 226 {
 227   PyType_Ready(ty);
 228   PyDict_SetItemString(ty->tp_dict, "__module__", modname);
 229 }
 230
 231 PyTypeObject *inittype(PyTypeObject *tyskel, PyTypeObject *meta)
 232 {
 233   PyTypeObject *ty = newtype(meta, tyskel, 0);
 234   ty->tp_flags |= Py_TPFLAGS_HEAPTYPE;
 235   typeready(ty);
 236   return (ty);
 237 }
 238
 239 /*----- Constants ---------------------------------------------------------*/
 240
 241 void setconstants(PyObject *mod, const struct nameval *c)
 242 {
 243   PyObject *x;
 244
 245   while (c->name) {
 246     if (c->value > LONG_MAX)
 247       x = PyLong_FromUnsignedLong(c->value);
 248     else
 249       x = PyInt_FromLong(c->value);
 250     PyModule_AddObject(mod, (/*unconst*/ char *)c->name, x);
 251     c++;
 252   }
 253 }
 254
 255 /*----- Building method tables --------------------------------------------*/
 256
 257 DA_DECL(method_v, PyMethodDef);
 258 static method_v global_pymethods = DA_INIT;
 259 void addmethods(const PyMethodDef *m)
 260 {
 261   size_t n;
 262
 263   for (n = 0; m[n].ml_name; n++);
 264   DA_ENSURE(&global_pymethods, n);
 265   memcpy(DA(&global_pymethods) + DA_LEN(&global_pymethods),
 266          m, n * sizeof(*m));
 267   DA_EXTEND(&global_pymethods, n);
 268 }
 269
 270 PyMethodDef *donemethods(void)
 271 {
 272   static const PyMethodDef mzero = { 0 };
 273   DA_PUSH(&global_pymethods, mzero);
 274   return (DA(&global_pymethods));
 275 }
 276
 277 /*----- Exceptions --------------------------------------------------------*/
 278
 279 PyObject *mkexc(PyObject *mod, PyObject *base,
 280                 const char *name, PyMethodDef *mm)
 281 {
 282   PyObject *nameobj = 0;
 283   PyObject *dict = 0;
 284   PyObject *exc = 0;
 285   PyObject *func = 0;
 286   PyObject *meth = 0;
 287
 288   if ((nameobj = PyString_FromFormat("%s.%s",
 289                                      PyModule_GetName(mod),
 290                                      name)) == 0 ||
 291       (dict = PyDict_New()) == 0 ||
 292       (exc = PyErr_NewException(PyString_AS_STRING(nameobj),
 293                                 base, dict)) == 0)
 294     goto fail;
 295
 296   if (mm) {
 297     while (mm->ml_name) {
 298       if ((func = PyCFunction_NewEx(mm, 0, mod)) == 0 ||
 299           (meth = PyMethod_New(func, 0, exc)) == 0 ||
 300           PyDict_SetItemString(dict, mm->ml_name, meth))
 301         goto fail;
 302       Py_DECREF(func); func = 0;
 303       Py_DECREF(meth); meth = 0;
 304       mm++;
 305     }
 306   }
 307
 308 done:
 309   Py_XDECREF(nameobj);
 310   Py_XDECREF(dict);
 311   return (exc);
 312
 313 fail:
 314   Py_XDECREF(exc);
 315   Py_XDECREF(func);
 316   Py_XDECREF(meth);
 317   exc = 0;
 318   goto done;
 319 }
 320
 321 /*----- Generic dictionary methods ----------------------------------------*/
 322
 323 static PyTypeObject *itemiter_pytype, *valiter_pytype;
 324
 325 typedef struct iter_pyobj {
 326   PyObject_HEAD
 327   PyObject *map;
 328   PyObject *i;
 329 } iter_pyobj;
 330 #define ITER_MAP(o) (((iter_pyobj *)(o))->map)
 331 #define ITER_I(o) (((iter_pyobj *)(o))->i)
 332
 333 static void iter_pydealloc(PyObject *me)
 334   { Py_DECREF(ITER_MAP(me)); Py_DECREF(ITER_I(me)); FREEOBJ(me); }
 335
 336 static PyObject *itemiter_pynext(PyObject *me)
 337 {
 338   PyObject *k = 0, *v = 0, *rc = 0;
 339
 340   if ((k = PyIter_Next(ITER_I(me))) != 0 &&
 341       (v = PyObject_GetItem(ITER_MAP(me), k)) != 0)
 342     rc = Py_BuildValue("(OO)", k, v);
 343   Py_XDECREF(k); Py_XDECREF(v);
 344   return (rc);
 345 }
 346
 347 static PyTypeObject itemiter_pytype_skel = {
 348   PyObject_HEAD_INIT(0) 0,              /* Header */
 349   "ItemIter",                           /* @tp_name@ */
 350   sizeof(iter_pyobj),                   /* @tp_basicsize@ */
 351   0,                                    /* @tp_itemsize@ */
 352
 353   iter_pydealloc,                       /* @tp_dealloc@ */
 354   0,                                    /* @tp_print@ */
 355   0,                                    /* @tp_getattr@ */
 356   0,                                    /* @tp_setattr@ */
 357   0,                                    /* @tp_compare@ */
 358   0,                                    /* @tp_repr@ */
 359   0,                                    /* @tp_as_number@ */
 360   0,                                    /* @tp_as_sequence@ */
 361   0,                                    /* @tp_as_mapping@ */
 362   0,                                    /* @tp_hash@ */
 363   0,                                    /* @tp_call@ */
 364   0,                                    /* @tp_str@ */
 365   0,                                    /* @tp_getattro@ */
 366   0,                                    /* @tp_setattro@ */
 367   0,                                    /* @tp_as_buffer@ */
 368   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 369     Py_TPFLAGS_BASETYPE,
 370
 371   /* @tp_doc@ */
 372 "Iterates over the items of a mapping.",
 373
 374   0,                                    /* @tp_traverse@ */
 375   0,                                    /* @tp_clear@ */
 376   0,                                    /* @tp_richcompare@ */
 377   0,                                    /* @tp_weaklistoffset@ */
 378   PyObject_SelfIter,                    /* @tp_iter@ */
 379   itemiter_pynext,                      /* @tp_iternext@ */
 380   0,                                    /* @tp_methods@ */
 381   0,                                    /* @tp_members@ */
 382   0,                                    /* @tp_getset@ */
 383   0,                                    /* @tp_base@ */
 384   0,                                    /* @tp_dict@ */
 385   0,                                    /* @tp_descr_get@ */
 386   0,                                    /* @tp_descr_set@ */
 387   0,                                    /* @tp_dictoffset@ */
 388   0,                                    /* @tp_init@ */
 389   PyType_GenericAlloc,                  /* @tp_alloc@ */
 390   abstract_pynew,                       /* @tp_new@ */
 391   0,                                    /* @tp_free@ */
 392   0                                     /* @tp_is_gc@ */
 393 };
 394
 395 static PyObject *valiter_pynext(PyObject *me)
 396 {
 397   PyObject *k = 0, *rc = 0;
 398
 399   if ((k = PyIter_Next(ITER_I(me))) != 0)
 400     rc = PyObject_GetItem(ITER_MAP(me), k);
 401   Py_XDECREF(k);
 402   return (rc);
 403 }
 404
 405 static PyTypeObject valiter_pytype_skel = {
 406   PyObject_HEAD_INIT(0) 0,              /* Header */
 407   "ValueIter",                          /* @tp_name@ */
 408   sizeof(iter_pyobj),                   /* @tp_basicsize@ */
 409   0,                                    /* @tp_itemsize@ */
 410
 411   iter_pydealloc,                       /* @tp_dealloc@ */
 412   0,                                    /* @tp_print@ */
 413   0,                                    /* @tp_getattr@ */
 414   0,                                    /* @tp_setattr@ */
 415   0,                                    /* @tp_compare@ */
 416   0,                                    /* @tp_repr@ */
 417   0,                                    /* @tp_as_number@ */
 418   0,                                    /* @tp_as_sequence@ */
 419   0,                                    /* @tp_as_mapping@ */
 420   0,                                    /* @tp_hash@ */
 421   0,                                    /* @tp_call@ */
 422   0,                                    /* @tp_str@ */
 423   0,                                    /* @tp_getattro@ */
 424   0,                                    /* @tp_setattro@ */
 425   0,                                    /* @tp_as_buffer@ */
 426   Py_TPFLAGS_DEFAULT |                  /* @tp_flags@ */
 427     Py_TPFLAGS_BASETYPE,
 428
 429   /* @tp_doc@ */
 430 "Iterates over the items of a mapping.",
 431
 432   0,                                    /* @tp_traverse@ */
 433   0,                                    /* @tp_clear@ */
 434   0,                                    /* @tp_richcompare@ */
 435   0,                                    /* @tp_weaklistoffset@ */
 436   PyObject_SelfIter,                    /* @tp_iter@ */
 437   valiter_pynext,                       /* @tp_iternext@ */
 438   0,                                    /* @tp_methods@ */
 439   0,                                    /* @tp_members@ */
 440   0,                                    /* @tp_getset@ */
 441   0,                                    /* @tp_base@ */
 442   0,                                    /* @tp_dict@ */
 443   0,                                    /* @tp_descr_get@ */
 444   0,                                    /* @tp_descr_set@ */
 445   0,                                    /* @tp_dictoffset@ */
 446   0,                                    /* @tp_init@ */
 447   PyType_GenericAlloc,                  /* @tp_alloc@ */
 448   abstract_pynew,                       /* @tp_new@ */
 449   0,                                    /* @tp_free@ */
 450   0                                     /* @tp_is_gc@ */
 451 };
 452
 453 PySequenceMethods gmap_pysequence = {
 454   0,                                    /* @sq_length@ */
 455   0,                                    /* @sq_concat@ */
 456   0,                                    /* @sq_repeat@ */
 457   0,                                    /* @sq_item@ */
 458   0,                                    /* @sq_slice@ */
 459   0,                                    /* @sq_ass_item@ */
 460   0,                                    /* @sq_ass_slice@ */
 461   PyMapping_HasKey,                     /* @sq_contains@ */
 462   0,                                    /* @sq_inplace_concat@ */
 463   0                                     /* @sq_inplace_repeat@ */
 464 };
 465
 466 Py_ssize_t gmap_pysize(PyObject *me)
 467 {
 468   PyObject *i = 0, *x = 0;
 469   int rc = -1;
 470   int n = 0;
 471
 472   if ((i = PyObject_GetIter(me)) == 0) goto done;
 473   while ((x = PyIter_Next(i)) != 0) { n++; Py_DECREF(x); x = 0; }
 474   if (PyErr_Occurred()) goto done;
 475   rc = n;
 476 done:
 477   Py_XDECREF(i); Py_XDECREF(x);
 478   return (rc);
 479 }
 480
 481 PyObject *gmapmeth_has_key(PyObject *me, PyObject *arg)
 482 {
 483   PyObject *k;
 484   if (!PyArg_ParseTuple(arg, "O:has_key", &k)) return (0);
 485   return (getbool(PyMapping_HasKey(me, k)));
 486 }
 487
 488 PyObject *gmapmeth_keys(PyObject *me, PyObject *arg)
 489 {
 490   PyObject *l = 0, *i = 0, *k, *rc = 0;
 491   int err;
 492
 493   if (!PyArg_ParseTuple(arg, ":keys") ||
 494       (l = PyList_New(0)) == 0 ||
 495       (i = PyObject_GetIter(me)) == 0)
 496     goto done;
 497   while ((k = PyIter_Next(i)) != 0)
 498     { err = PyList_Append(l, k); Py_DECREF(k); if (err) goto done; }
 499   if (PyErr_Occurred()) goto done;
 500   rc = l; l = 0;
 501 done:
 502   Py_XDECREF(l); Py_XDECREF(i);
 503   return (rc);
 504 }
 505
 506 PyObject *gmapmeth_values(PyObject *me, PyObject *arg)
 507 {
 508   PyObject *l = 0, *i = 0, *k, *v, *rc = 0;
 509   int err = 0;
 510
 511   if (!PyArg_ParseTuple(arg, ":values") ||
 512       (l = PyList_New(0)) == 0 ||
 513       (i = PyObject_GetIter(me)) == 0)
 514     goto done;
 515   while ((k = PyIter_Next(i)) != 0) {
 516     if ((v = PyObject_GetItem(me, k)) == 0 ||
 517         PyList_Append(l, v))
 518       err = -1;
 519     Py_DECREF(k); Py_XDECREF(v);
 520     if (err) goto done;
 521   }
 522   if (PyErr_Occurred()) goto done;
 523   rc = l; l = 0;
 524 done:
 525   Py_XDECREF(l); Py_XDECREF(i);
 526   return (rc);
 527 }
 528
 529 PyObject *gmapmeth_items(PyObject *me, PyObject *arg)
 530 {
 531   PyObject *l = 0, *i = 0, *k, *v, *z, *rc = 0;
 532   int err = 0;
 533
 534   if (!PyArg_ParseTuple(arg, ":items") ||
 535       (l = PyList_New(0)) == 0 ||
 536       (i = PyObject_GetIter(me)) == 0)
 537     goto done;
 538   while ((k = PyIter_Next(i)) != 0) {
 539     z = 0;
 540     if ((v = PyObject_GetItem(me, k)) == 0 ||
 541         (z = Py_BuildValue("(OO)", k, v)) == 0 ||
 542         PyList_Append(l, z))
 543       err = -1;
 544     Py_DECREF(k); Py_XDECREF(v); Py_XDECREF(z);
 545     if (err) goto done;
 546   }
 547   if (PyErr_Occurred()) goto done;
 548   rc = l; l = 0;
 549 done:
 550   Py_XDECREF(l); Py_XDECREF(i);
 551   return (rc);
 552 }
 553
 554 PyObject *gmapmeth_iterkeys(PyObject *me, PyObject *arg)
 555 {
 556   if (!PyArg_ParseTuple(arg, ":iterkeys")) return (0);
 557   return (PyObject_GetIter(me));
 558 }
 559
 560 PyObject *gmapmeth_itervalues(PyObject *me, PyObject *arg)
 561 {
 562   PyObject *i;
 563   iter_pyobj *ii;
 564
 565   if (!PyArg_ParseTuple(arg, ":itervalues") ||
 566       (i = PyObject_GetIter(me)) == 0)
 567     return (0);
 568   ii = PyObject_NEW(iter_pyobj, valiter_pytype);
 569   ii->map = me; Py_INCREF(me);
 570   ii->i = i;
 571   return ((PyObject *)ii);
 572 }
 573
 574 PyObject *gmapmeth_iteritems(PyObject *me, PyObject *arg)
 575 {
 576   PyObject *i;
 577   iter_pyobj *ii;
 578
 579   if (!PyArg_ParseTuple(arg, ":iteritems") ||
 580       (i = PyObject_GetIter(me)) == 0)
 581     return (0);
 582   ii = PyObject_NEW(iter_pyobj, itemiter_pytype);
 583   ii->map = me; Py_INCREF(me);
 584   ii->i = i;
 585   return ((PyObject *)ii);
 586 }
 587
 588 PyObject *gmapmeth_clear(PyObject *me, PyObject *arg)
 589 {
 590   PyObject *i = 0, *k = 0, *rc = 0;
 591
 592   if (!PyArg_ParseTuple(arg, ":clear") ||
 593       (i = PyObject_GetIter(me)) == 0)
 594     goto end;
 595   while ((k = PyIter_Next(i)) != 0) {
 596     PyObject_DelItem(me, k);
 597     Py_DECREF(k);
 598   }
 599   if (PyErr_Occurred()) goto end;
 600   rc = me; Py_INCREF(me);
 601 end:
 602   Py_XDECREF(i);
 603   return (rc);
 604 }
 605
 606 static char *def_kwlist[] = { "key", "default", 0 };
 607
 608 PyObject *gmapmeth_get(PyObject *me, PyObject *arg, PyObject *kw)
 609 {
 610   PyObject *k, *def = Py_None, *v;
 611
 612   if (!PyArg_ParseTupleAndKeywords(arg, kw, "OO:get", def_kwlist, &k, &def))
 613     return (0);
 614   if ((v = PyObject_GetItem(me, k)) != 0) return (v);
 615   PyErr_Clear();
 616   RETURN_OBJ(def);
 617 }
 618
 619 PyObject *gmapmeth_setdefault(PyObject *me, PyObject *arg, PyObject *kw)
 620 {
 621   PyObject *k, *def = Py_None, *v;
 622
 623   if (!PyArg_ParseTupleAndKeywords(arg, kw, "OO:setdefault",
 624                                    def_kwlist, &k, &def))
 625     return (0);
 626   if ((v = PyObject_GetItem(me, k)) != 0) return (v);
 627   PyErr_Clear();
 628   if (PyObject_SetItem(me, k, def)) return (0);
 629   RETURN_OBJ(def);
 630 }
 631
 632 PyObject *gmapmeth_pop(PyObject *me, PyObject *arg, PyObject *kw)
 633 {
 634   PyObject *k, *def = 0, *v;
 635
 636   if (!PyArg_ParseTupleAndKeywords(arg, kw, "OO:pop", def_kwlist, &k, &def))
 637     return (0);
 638   if ((v = PyObject_GetItem(me, k)) != 0) {
 639     PyObject_DelItem(me, k);
 640     return (v);
 641   }
 642   PyErr_Clear();
 643   RETURN_OBJ(def);
 644 }
 645
 646 PyObject *gmapmeth_update(PyObject *me, PyObject *arg)
 647 {
 648   PyObject *map, *i = 0, *k, *v, *rc = 0;
 649   int err = 0;
 650
 651   if (!PyArg_ParseTuple(arg, "O:update", &map) ||
 652       (i = PyObject_GetIter(map)) == 0)
 653     goto end;
 654   while ((k = PyIter_Next(i)) != 0) {
 655     if ((v = PyObject_GetItem(map, k)) == 0 ||
 656         PyObject_SetItem(me, k, v))
 657       err = -1;
 658     Py_DECREF(k); Py_XDECREF(v);
 659     if (err) goto end;
 660   }
 661   if (PyErr_Occurred()) goto end;
 662   rc = me; Py_INCREF(me);
 663 end:
 664   Py_XDECREF(i);
 665   return (rc);
 666 }
 667
 668 PyObject *gmapmeth_popitem(PyObject *me, PyObject *arg)
 669 {
 670   PyObject *i = 0, *k = 0, *v = 0, *rc = 0;
 671
 672   if (!PyArg_ParseTuple(arg, ":popitem") ||
 673       (i = PyObject_GetIter(me)))
 674     goto end;
 675   if ((k = PyIter_Next(i)) == 0) {
 676     if (!PyErr_Occurred()) VALERR("popitem(): mapping is empty");
 677     goto end;
 678   }
 679   if ((v = PyObject_GetItem(me, k)) == 0 ||
 680       PyObject_DelItem(me, k))
 681     goto end;
 682   rc = Py_BuildValue("(OO)", k, v);
 683 end:
 684   Py_XDECREF(i); Py_XDECREF(k); Py_XDECREF(v);
 685   return (rc);
 686 }
 687
 688 PyMethodDef gmap_pymethods[] = {
 689   GMAP_METHODS
 690   { 0 }
 691 };
 692
 693 /*----- Initialization ----------------------------------------------------*/
 694
 695 void util_pyinit(void)
 696 {
 697   modname = PyString_FromString("catacomb");
 698   INITTYPE(itemiter, root);
 699   INITTYPE(valiter, root);
 700 }
 701
 702 void util_pyinsert(PyObject *mod)
 703 {
 704   INSERT("ItemIter", itemiter_pytype);
 705   INSERT("ValueIter", valiter_pytype);
 706 }
 707
 708 /*----- That's all, folks -------------------------------------------------*/