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/RISCOS/Modules/swimodule.c

http://unladen-swallow.googlecode.com/
C | 575 lines | 500 code | 55 blank | 20 comment | 103 complexity | 41c0e08b1a7f80dbeb3fd9b9582c6f99 MD5 | raw file
  1/* swi
  2
  3   RISC OS swi functions
  4
  5 1.00               Chris Stretch
  6
  7
  8 1.01  12 May 1999  Laurence Tratt
  9
 10   * Changed swi.error to be a class based exception rather than string based
 11   * Added swi.ArgError which is generated for errors when the user passes invalid arguments to
 12       functions etc
 13   * Added "errnum" attribute to swi.error, so one can now check to see what the error number was
 14
 15 1.02  03 March 2002 Dietmar Schwertberger
 16   * Added string, integer, integers, tuple and tuples
 17*/
 18
 19#include "oslib/os.h"
 20#include <kernel.h>
 21#include "Python.h"
 22
 23
 24#define PyBlock_Check(op) ((op)->ob_type == &PyBlockType)
 25
 26
 27static PyObject *SwiError; /* Exception swi.error */
 28static PyObject *ArgError; /* Exception swi.ArgError */
 29static os_error *e;
 30
 31static PyObject *swi_oserror(void)
 32{ PyErr_SetString(SwiError,e->errmess);
 33  PyObject_SetAttrString(PyErr_Occurred(), "errnum", PyInt_FromLong(e->errnum));
 34  return 0;
 35}
 36
 37static PyObject *swi_error(char *s)
 38{ PyErr_SetString(ArgError,s);
 39  return 0;
 40}
 41
 42typedef struct
 43{ PyObject_HEAD
 44  void *block;
 45  int length; /*length in bytes*/
 46  int heap;
 47} PyBlockObject;
 48
 49static PyTypeObject PyBlockType;
 50
 51/* block commands */
 52
 53static PyObject *PyBlock_New(PyObject *self,PyObject *args)
 54{ int size;
 55  PyBlockObject *b;
 56  PyObject *init=0;
 57  if(!PyArg_ParseTuple(args,"i|O",&size,&init)) return NULL;
 58  if(size<1) size=1;
 59  b=PyObject_NEW(PyBlockObject,&PyBlockType);
 60  if(!b) return NULL;
 61  b->block=malloc(4*size);
 62  if(!b->block)
 63  { Py_DECREF(b);
 64    return PyErr_NoMemory();
 65  }
 66  b->length=4*size;
 67  b->heap=1;
 68  if(init)
 69  { if(PyString_Check(init))
 70    { int n=PyString_Size(init);
 71      if (n>4*size) n=4*size;
 72      memcpy(b->block,PyString_AsString(init),n);
 73      memset((char*)b->block+n,0,4*size-n);
 74    }
 75    else
 76    { int n,k;
 77      long *p=(long*)b->block;
 78      if(!PyList_Check(init)) goto fail;
 79      n=PyList_Size(init);
 80      if (n>size) n=size;
 81      for(k=0;k<n;k++)
 82      { PyObject *q=PyList_GetItem(init,k);
 83        if(!PyInt_Check(q)) goto fail;
 84        p[k]=PyInt_AsLong(q);
 85      }
 86      for(;k<size;k++) p[k]=0;
 87    }
 88  }
 89  return (PyObject *)b;
 90  fail:PyErr_SetString(PyExc_TypeError,
 91     "block initialiser must be string or list of integers");
 92  Py_DECREF(b);
 93  return NULL;
 94}
 95
 96static PyObject *PyRegister(PyObject *self,PyObject *args)
 97{ int size,ptr;
 98  PyBlockObject *b;
 99  if(!PyArg_ParseTuple(args,"ii",&size,&ptr)) return NULL;
100  if(size<1) size=1;
101  b=PyObject_NEW(PyBlockObject,&PyBlockType);
102  if(!b) return NULL;
103  b->block=(void*)ptr;
104  b->length=4*size;
105  b->heap=0;
106  return (PyObject *)b;
107}
108
109static PyObject *PyBlock_ToString(PyBlockObject *self,PyObject *arg)
110{ int s=0,e=self->length;
111  if(!PyArg_ParseTuple(arg,"|ii",&s,&e)) return NULL;
112  if(s<0||e>self->length||s>e)
113  { PyErr_SetString(PyExc_IndexError,"block index out of range");
114    return NULL;
115  }
116  return PyString_FromStringAndSize((char*)self->block+s,e-s);
117}
118
119static PyObject *PyBlock_NullString(PyBlockObject *self,PyObject *arg)
120{ int s=0,e=self->length,i;
121  char *p=(char*)self->block;
122  if(!PyArg_ParseTuple(arg,"|ii",&s,&e)) return NULL;
123  if(s<0||e>self->length||s>e)
124  { PyErr_SetString(PyExc_IndexError,"block index out of range");
125    return NULL;
126  }
127  for(i=s;i<e;i++) if(p[i]==0) break;
128  return PyString_FromStringAndSize((char*)self->block+s,i-s);
129}
130
131static PyObject *PyBlock_CtrlString(PyBlockObject *self,PyObject *arg)
132{ int s=0,e=self->length,i;
133  char *p=(char*)self->block;
134  if(!PyArg_ParseTuple(arg,"|ii",&s,&e)) return NULL;
135  if(s<0||e>self->length||s>e)
136  { PyErr_SetString(PyExc_IndexError,"block index out of range");
137    return NULL;
138  }
139  for(i=s;i<e;i++) if(p[i]<32) break;
140  return PyString_FromStringAndSize((char*)self->block+s,i-s);
141}
142
143static PyObject *PyBlock_PadString(PyBlockObject *self,PyObject *arg)
144{ int s=0,e=self->length,n,m;
145  char *str;
146  char c;
147  char *p=(char*)self->block;
148  if(!PyArg_ParseTuple(arg,"s#c|ii",&str,&n,&c,&s,&e)) return NULL;
149  if(s<0||e>self->length||s>e)
150  { PyErr_SetString(PyExc_IndexError,"block index out of range");
151    return NULL;
152  }
153  m=e-s;
154  if(n>m) n=m;
155  memcpy(p+s,str,n);memset(p+s+n,c,m-n);
156  Py_INCREF(Py_None);return Py_None;
157}
158
159static PyObject *PyBlock_BitSet(PyBlockObject *self,PyObject *arg)
160{ int i,x,y;
161  int *p=(int*)self->block;
162  if(!PyArg_ParseTuple(arg,"iii",&i,&x,&y)) return NULL;
163  if(i<0||i>=self->length/4)
164  { PyErr_SetString(PyExc_IndexError,"block index out of range");
165    return NULL;
166  }
167  p[i]=(p[i]&y)^x;
168  Py_INCREF(Py_None);return Py_None;
169}
170
171static PyObject *PyBlock_Resize(PyBlockObject *self,PyObject *arg)
172{ int n;
173  if(!PyArg_ParseTuple(arg,"i",&n)) return NULL;
174  if(n<1) n=1;
175  if(self->heap)
176  { void *v=realloc(self->block,4*n);
177    if (!v) return PyErr_NoMemory();
178    self->block=v;
179  }
180  self->length=4*n;
181  Py_INCREF(Py_None);return Py_None;
182}
183
184static PyObject *PyBlock_ToFile(PyBlockObject *self,PyObject *arg)
185{ int s=0,e=self->length/4;
186  PyObject *f;
187  FILE *fp;
188  if(!PyArg_ParseTuple(arg,"O|ii",&f,&s,&e)) return NULL;
189  fp=PyFile_AsFile(f);
190  if (!fp)
191  { PyErr_SetString(PyExc_TypeError, "arg must be open file");
192    return NULL;
193  }
194  fwrite((int*)(self->block)+s,4,e-s,fp);
195  Py_INCREF(Py_None);return Py_None;
196}
197
198static struct PyMethodDef PyBlock_Methods[]=
199{ { "tostring",(PyCFunction)PyBlock_ToString,1},
200  { "padstring",(PyCFunction)PyBlock_PadString,1},
201  { "nullstring",(PyCFunction)PyBlock_NullString,1},
202  { "ctrlstring",(PyCFunction)PyBlock_CtrlString,1},
203  { "bitset",(PyCFunction)PyBlock_BitSet,1},
204  { "resize",(PyCFunction)PyBlock_Resize,1},
205  { "tofile",(PyCFunction)PyBlock_ToFile,1},
206  { NULL,NULL}		/* sentinel */
207};
208
209static int block_len(PyBlockObject *b)
210{ return b->length/4;
211}
212
213static PyObject *block_concat(PyBlockObject *b,PyBlockObject *c)
214{ PyErr_SetString(PyExc_IndexError,"block concatenation not implemented");
215  return NULL;
216}
217
218static PyObject *block_repeat(PyBlockObject *b,Py_ssize_t i)
219{ PyErr_SetString(PyExc_IndexError,"block repetition not implemented");
220  return NULL;
221}
222
223static PyObject *block_item(PyBlockObject *b,Py_ssize_t i)
224{ if(i<0||4*i>=b->length)
225  { PyErr_SetString(PyExc_IndexError,"block index out of range");
226    return NULL;
227  }
228  return PyInt_FromLong(((long*)(b->block))[i]);
229}
230
231static PyObject *block_slice(PyBlockObject *b,Py_ssize_t i,Py_ssize_t j)
232{ Py_ssize_t n,k;
233  long *p=b->block;
234  PyObject *result;
235  if(j>b->length/4) j=b->length/4;
236  if(i<0||i>j)
237  { PyErr_SetString(PyExc_IndexError,"block index out of range");
238    return NULL;
239  }
240  n=j-i;
241  result=PyList_New(n);
242  for(k=0;k<n;k++) PyList_SetItem(result,k,PyInt_FromSsize_t(p[i+k]));
243  return result;
244}
245
246static int block_ass_item(PyBlockObject *b,Py_ssize_t i,PyObject *v)
247{ if(i<0||i>=b->length/4)
248  { PyErr_SetString(PyExc_IndexError,"block index out of range");
249    return -1;
250  }
251  if(!PyInt_Check(v))
252  { PyErr_SetString(PyExc_TypeError,"block item must be integer");
253    return -1;
254  }
255  ((long*)(b->block))[i]=PyInt_AsLong(v);
256  return 0;
257}
258
259static int block_ass_slice(PyBlockObject *b,Py_ssize_t i,Py_ssize_t j,PyObject *v)
260{ Py_ssize_t n,k;
261  long *p=b->block;
262  if(j>b->length/4) j=b->length/4;
263  if(i<0||i>j)
264  { PyErr_SetString(PyExc_IndexError,"block index out of range");
265    return -1;
266  }
267  if(!PyList_Check(v)) goto fail;
268  n=PyList_Size(v);
269  if(n>j-i) n=j-i;
270  for(k=0;k<n;k++)
271  { PyObject *q=PyList_GetItem(v,k);
272    if(!PyInt_Check(q)) goto fail;
273    p[i+k]=PyInt_AsLong(q);
274  }
275  for(;k<j-i;k++) p[i+k]=0;
276  return 0;
277  fail:PyErr_SetString(PyExc_TypeError,"block slice must be integer list");
278  return -1;
279}
280
281static PySequenceMethods block_as_sequence=
282{ (inquiry)block_len,		/*sq_length*/
283  (binaryfunc)block_concat,		/*sq_concat*/
284  (ssizeargfunc)block_repeat,		/*sq_repeat*/
285  (ssizeargfunc)block_item,		/*sq_item*/
286  (ssizessizeargfunc)block_slice,		/*sq_slice*/
287  (ssizeobjargproc)block_ass_item,	/*sq_ass_item*/
288  (ssizessizeobjargproc)block_ass_slice,	/*sq_ass_slice*/
289};
290
291static PyObject *PyBlock_GetAttr(PyBlockObject *s,char *name)
292{
293  if (!strcmp(name, "length")) return PyInt_FromLong((long)s->length);
294  if (!strcmp(name, "start")) return PyInt_FromLong((long)s->block);
295  if (!strcmp(name,"end")) return PyInt_FromLong(((long)(s->block)+s->length));
296  if (!strcmp(name, "__members__"))
297  { PyObject *list = PyList_New(3);
298    if (list)
299    { PyList_SetItem(list, 0, PyString_FromString("length"));
300      PyList_SetItem(list, 1, PyString_FromString("start"));
301      PyList_SetItem(list, 2, PyString_FromString("end"));
302      if (PyErr_Occurred()) { Py_DECREF(list);list = NULL;}
303    }
304    return list;
305  }
306  return Py_FindMethod(PyBlock_Methods, (PyObject*) s,name);
307}
308
309static void PyBlock_Dealloc(PyBlockObject *b)
310{
311    if(b->heap) {
312        if (b->heap)
313            ;
314        else
315            PyMem_DEL(b->block);
316    }
317  PyMem_DEL(b);
318}
319
320static PyTypeObject PyBlockType=
321{ PyObject_HEAD_INIT(&PyType_Type)
322  0,				/*ob_size*/
323  "block",			/*tp_name*/
324  sizeof(PyBlockObject),	/*tp_size*/
325  0,				/*tp_itemsize*/
326	/* methods */
327  (destructor)PyBlock_Dealloc,	/*tp_dealloc*/
328  0,				/*tp_print*/
329  (getattrfunc)PyBlock_GetAttr,	/*tp_getattr*/
330  0,				/*tp_setattr*/
331  0,				/*tp_compare*/
332  0,				/*tp_repr*/
333  0,				/*tp_as_number*/
334  &block_as_sequence,		/*tp_as_sequence*/
335  0,				/*tp_as_mapping*/
336  0,                            /*tp_hash*/
337};
338
339/* swi commands */
340
341static PyObject *swi_swi(PyObject *self,PyObject *args)
342{ PyObject *name,*format,*result,*v;
343  int swino,carry,rno=0,j,n;
344  char *swiname,*fmt,*outfmt;
345  _kernel_swi_regs r;
346  PyBlockObject *ao;
347  if(args==NULL||!PyTuple_Check(args)||(n=PyTuple_Size(args))<2)
348  { PyErr_BadArgument(); return NULL;}
349  name=PyTuple_GetItem(args,0);
350  if(!PyArg_Parse(name,"i",&swino))
351  { PyErr_Clear();
352    if(!PyArg_Parse(name,"s",&swiname)) return NULL;
353    e=xos_swi_number_from_string(swiname,&swino);
354    if(e) return swi_oserror();
355  }
356  format=PyTuple_GetItem(args,1);
357  if(!PyArg_Parse(format,"s",&fmt)) return NULL;
358  j=2;
359  for(;;fmt++)
360  { switch(*fmt)
361    { case '.': rno++;continue;
362      case ';':case 0: goto swicall;
363      case '0':case '1':case '2':case '3':case '4':
364      case '5':case '6':case '7':case '8':case '9':
365        r.r[rno++]=*fmt-'0';continue;
366      case '-':r.r[rno++]=-1;continue;
367    }
368    if(j>=n) return swi_error("Too few arguments");
369    v=PyTuple_GetItem(args,j++);
370    switch(*fmt)
371    { case 'i':if(!PyArg_Parse(v,"i",&r.r[rno])) return NULL;
372               break;
373      case 's':if(!PyArg_Parse(v,"s",(char**)(&r.r[rno]))) return NULL;
374               break;
375      case 'b':if(!PyArg_Parse(v,"O",(PyObject**)&ao)) return NULL;
376               if(!PyBlock_Check(v)) return swi_error("Not a block");
377               r.r[rno]=(int)(ao->block);
378               break;
379      case 'e':if(!PyArg_Parse(v,"O",(PyObject**)&ao)) return NULL;
380               if(!PyBlock_Check(v)) return swi_error("Not a block");
381               r.r[rno]=(int)(ao->block)+ao->length;
382               break;
383      default:return swi_error("Odd format character");
384    }
385    rno++;
386  }
387  swicall:e=(os_error*)_kernel_swi_c(swino,&r,&r,&carry);
388  if(e) return swi_oserror();
389  if(*fmt==0) { Py_INCREF(Py_None);return Py_None;}
390  n=0;
391  for(outfmt=++fmt;*outfmt;outfmt++)  switch(*outfmt)
392  { case 'i':case 's':case '*':n++;break;
393    case '.':break;
394    default:return swi_error("Odd format character");
395  }
396  if(n==0) { Py_INCREF(Py_None);return Py_None;}
397  if(n!=1)
398  { result=PyTuple_New(n);
399    if(!result) return NULL;
400  }
401  rno=0;j=0;
402  for(;*fmt;fmt++)
403  {  switch(*fmt)
404    { case 'i':v=PyInt_FromLong((long)r.r[rno++]); break;
405      case 's':v=PyString_FromString((char*)(r.r[rno++])); break;
406      case '.':rno++; continue;
407      case '*':v=PyInt_FromLong((long)carry); break;
408    }
409    if(!v) goto fail;
410    if(n==1) return v;
411    PyTuple_SetItem(result,j,v);
412    j++;
413  }
414  return result;
415  fail:Py_DECREF(result);return 0;
416}
417
418static PyObject *swi_string(PyObject *self, PyObject *arg)
419{ char *s;
420  int l=-1;
421  if(!PyArg_ParseTuple(arg,"i|i",(unsigned int *)&s, &l)) return NULL;
422  if (l==-1)
423    l = strlen(s);
424  return PyString_FromStringAndSize((char*)s, l);
425}
426
427static char swi_string__doc__[] =
428"string(address[, length]) -> string\n\
429Read a null terminated string from the given address.";
430
431
432static PyObject *swi_integer(PyObject *self, PyObject *arg)
433{ int *i;
434
435  if(!PyArg_ParseTuple(arg,"i",(unsigned int *)&i))
436    return NULL;
437  return PyInt_FromLong(*i);
438}
439
440static char swi_integer__doc__[] =
441"integer(address) -> string\n\
442Read an integer from the given address.";
443
444
445static PyObject *swi_integers(PyObject *self, PyObject *arg)
446{ int *i;
447  int c=-1;
448  PyObject *result, *result1;
449  
450  if(!PyArg_ParseTuple(arg,"i|i",(unsigned int *)&i, &c)) return NULL;
451  result=PyList_New(0);
452  if (result) {
453    while ( c>0 || (c==-1 && *i) ) {
454      result1 = PyInt_FromLong((long)*i);
455      if (!result1) {
456        Py_DECREF(result);
457        return NULL;
458      }
459      if (PyList_Append(result, result1)!=0) {
460        Py_DECREF(result);
461        Py_DECREF(result1);
462        return NULL;
463      };
464      i++;
465      if (c!=-1)
466        c--;
467    }
468  }
469  return result;
470}
471
472static char swi_integers__doc__[] =
473"integers(address[, count]) -> string\n\
474Either read a null terminated list of integers or\n\
475a list of given length from the given address.";
476
477
478static PyObject *swi_tuples(PyObject *self, PyObject *arg)
479{
480  unsigned char *i;         /* points to current */
481  int c=-1, l=4, j, zero;         /* count, length, index */
482  PyObject *result, *result1, *result11;
483  
484  if(!PyArg_ParseTuple(arg,"i|ii",(unsigned int *)&i, &l, &c)) return NULL;
485  result=PyList_New(0);
486  if (result) {
487    while (c) {
488      result1 = PyTuple_New(l);
489      if (!result1) {
490        Py_DECREF(result);
491        return NULL;
492      }
493      zero = (c==-1); /* check for zeros? */
494      for(j=0;j<l;j++) {
495        if (zero && *i)
496          zero = 0;   /* non-zero found */
497        result11 = PyInt_FromLong((long)(*i));
498        if (!result11) {
499          Py_DECREF(result);
500          return NULL;
501        }
502        PyTuple_SetItem(result1, j, result11);
503        i++;
504      }
505      if (c==-1 && zero) {
506        Py_DECREF(result1);
507        c = 0;
508        break;
509      }
510      if (PyList_Append(result, result1)!=0) {
511        Py_DECREF(result1);
512        Py_DECREF(result);
513        return NULL;
514      }
515      if (c!=-1)
516        c--;
517    }
518  }
519  return result;
520}
521
522static char swi_tuples__doc__[] =
523"tuples(address[, length=4[, count]]) -> string\n\
524Either read a null terminated list of byte tuples or\n\
525a list of given length from the given address.";
526
527
528static PyObject *swi_tuple(PyObject *self, PyObject *arg)
529{
530  unsigned char *i;         /* points to current */
531  int c=1, j;
532  PyObject *result, *result1;
533  
534  if(!PyArg_ParseTuple(arg,"i|i",(unsigned int *)&i, &c)) return NULL;
535  result = PyTuple_New(c);
536  if (!result)
537    return NULL;
538  for(j=0;j<c;j++) {
539    result1 = PyInt_FromLong((long)(i[j]));
540    if (!result1) {
541      Py_DECREF(result);
542      return NULL;
543    }
544    PyTuple_SetItem(result, j, result1);
545  }
546  return result;
547}
548
549static char swi_tuple__doc__[] =
550"tuple(address[, count=1]]) -> tuple\n\
551Read count bytes from given address.";
552
553
554static PyMethodDef SwiMethods[]=
555{ { "swi", swi_swi, METH_VARARGS},
556  { "block", PyBlock_New, METH_VARARGS},
557  { "register", PyRegister, METH_VARARGS},
558  { "string", swi_string, METH_VARARGS, swi_string__doc__},
559  { "integer", swi_integer, METH_VARARGS, swi_integer__doc__},
560  { "integers", swi_integers, METH_VARARGS, swi_integers__doc__},
561  { "tuples", swi_tuples, METH_VARARGS, swi_tuples__doc__},
562  { "tuple", swi_tuple, METH_VARARGS, swi_tuple__doc__},
563  { NULL,NULL,0,NULL}		 /* Sentinel */
564};
565
566
567void initswi()
568{ PyObject *m, *d;
569  m = Py_InitModule("swi", SwiMethods);
570  d = PyModule_GetDict(m);
571  SwiError=PyErr_NewException("swi.error", NULL, NULL);
572  PyDict_SetItemString(d,"error",SwiError);
573  ArgError=PyErr_NewException("swi.ArgError", NULL, NULL);
574  PyDict_SetItemString(d,"ArgError",ArgError);
575}