Mercurial > pub > dyncall > bindings
annotate python/pydc/pydcext.c @ 16:a40084782546
- added support for more return values to python binding
- python binding readme update
| author | cslag |
|---|---|
| date | Sat, 26 Mar 2016 22:31:42 +0100 |
| parents | bf5625bb6f05 |
| children | edbbd467f50a |
| rev | line source |
|---|---|
| 0 | 1 /****************************************************************************** |
| 2 ** | |
| 3 ** pydc - python dyncall package | |
| 4 ** | |
| 5 ** python extension package in C | |
| 6 ** Copyright 2007 Daniel Adler. | |
| 7 ** | |
| 8 ** December 04, 2007 | |
| 9 ** | |
| 10 *****************************************************************************/ | |
| 11 | |
| 12 #include <Python.h> | |
| 13 #include "dynload.h" | |
| 14 #include <limits.h> | |
| 15 | |
| 16 /* PyCObject destructor callback for libhandle */ | |
| 17 | |
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18 void free_library(void* libhandle) |
| 0 | 19 { |
| 20 if (libhandle != 0) | |
| 21 dlFreeLibrary(libhandle); | |
| 22 } | |
| 23 | |
| 24 /* load function */ | |
| 25 | |
| 26 static PyObject* | |
| 27 pydc_load(PyObject* self, PyObject* args) | |
| 28 { | |
| 29 const char* libpath; | |
| 30 void* libhandle; | |
| 31 | |
| 32 if ( !PyArg_ParseTuple(args,"s", &libpath) ) return PyErr_Format(PyExc_RuntimeError, "libpath argument (string) missing"); | |
| 33 | |
| 34 libhandle = dlLoadLibrary(libpath); | |
| 35 | |
| 36 if (!libhandle) return PyErr_Format(PyExc_RuntimeError, "dlLoadLibrary('%s') failed", libpath); | |
| 37 | |
| 38 return PyCObject_FromVoidPtr(libhandle, &free_library); | |
| 39 } | |
| 40 | |
| 41 /* find function */ | |
| 42 | |
| 43 static PyObject* | |
| 44 pydc_find(PyObject* self, PyObject* args) | |
| 45 { | |
| 46 PyObject* pcobj; | |
| 47 const char* symbol; | |
| 48 void* libhandle; | |
| 49 void* funcptr; | |
| 50 | |
| 51 if ( !PyArg_ParseTuple(args,"Os", &pcobj, &symbol) ) return PyErr_Format(PyExc_RuntimeError, "argument mismatch"); | |
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52 |
| 0 | 53 libhandle = PyCObject_AsVoidPtr(pcobj); |
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54 |
| 0 | 55 if (!libhandle) return PyErr_Format(PyExc_RuntimeError, "libhandle is null"); |
| 56 | |
| 57 funcptr = dlFindSymbol(libhandle, symbol); | |
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58 if (!funcptr) |
| 0 | 59 return PyErr_Format(PyExc_RuntimeError, "symbol '%s' not found", symbol); |
| 60 | |
| 61 return PyCObject_FromVoidPtr(funcptr, NULL); | |
| 62 } | |
| 63 | |
| 64 /* free function */ | |
| 65 | |
| 66 static PyObject* | |
| 67 pydc_free(PyObject* self, PyObject* args) | |
| 68 { | |
| 69 PyObject* pcobj; | |
| 70 void* libhandle; | |
| 71 | |
| 72 if ( !PyArg_ParseTuple(args,"o", &pcobj) ) return PyErr_Format(PyExc_RuntimeError, "argument mismatch"); | |
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73 |
| 0 | 74 libhandle = PyCObject_AsVoidPtr(pcobj); |
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75 |
| 0 | 76 if (!libhandle) return PyErr_Format(PyExc_RuntimeError, "libhandle is NULL"); |
| 77 | |
| 78 dlFreeLibrary(libhandle); | |
| 79 PyCObject_SetVoidPtr(pcobj,0); | |
| 80 Py_RETURN_NONE; | |
| 81 } | |
| 82 | |
| 83 #include "dyncall.h" | |
| 84 #include "dyncall_signature.h" | |
| 85 | |
| 86 DCCallVM* gpCall; | |
| 87 | |
| 88 /* call function */ | |
| 89 | |
| 90 static PyObject* | |
| 91 pydc_call(PyObject* self, PyObject* in_args) | |
| 92 { | |
| 93 PyObject* pcobj_funcptr; | |
| 94 const char* signature; | |
| 95 PyObject* args; | |
| 96 int l; | |
| 97 const char* ptr; | |
| 98 char ch; | |
| 99 int pos; | |
| 100 void* pfunc; | |
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101 |
| 0 | 102 if ( !PyArg_ParseTuple(in_args,"OsO", &pcobj_funcptr, &signature, &args) ) return PyErr_Format(PyExc_RuntimeError, "argument mismatch"); |
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103 pfunc = PyCObject_AsVoidPtr(pcobj_funcptr); |
| 0 | 104 if ( !pfunc ) return PyErr_Format( PyExc_RuntimeError, "function pointer is NULL" ); |
| 105 l = PyTuple_Size(args); | |
| 106 | |
| 107 ptr = signature; | |
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108 pos = 0; |
| 0 | 109 |
| 110 dcReset(gpCall); | |
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111 |
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112 while ( (ch = *ptr) != '\0' && ch != ')' ) |
| 0 | 113 { |
| 114 PyObject* po; | |
| 115 | |
| 116 int index = pos+1; | |
| 117 | |
| 118 if (pos > l) return PyErr_Format( PyExc_RuntimeError, "expecting more arguments" ); | |
| 119 | |
| 120 po = PyTuple_GetItem(args,pos); | |
| 121 | |
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122 switch(ch) |
| 0 | 123 { |
| 124 case DC_SIGCHAR_BOOL: | |
| 125 { | |
| 126 DCbool b; | |
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127 if ( !PyBool_Check(po) ) return PyErr_Format( PyExc_RuntimeError, "argument mismatch at pos %d - expecting a bool", index ); |
| 0 | 128 b = (Py_True == po) ? DC_TRUE : DC_FALSE; |
| 129 dcArgBool(gpCall, b); | |
| 130 } | |
| 131 break; | |
| 132 case DC_SIGCHAR_CHAR: | |
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133 case DC_SIGCHAR_UCHAR: |
| 0 | 134 { |
| 135 DCchar c; | |
| 136 if ( PyString_Check(po) ) | |
| 137 { | |
| 138 // Py_ssize_t l; | |
| 139 size_t l; | |
| 140 char* s; | |
| 141 l = PyString_GET_SIZE(po); | |
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142 if (l != 1) return PyErr_Format( PyExc_RuntimeError, "argument mismatch at pos %d - expecting a string with length of 1 (a char string)", index ); |
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143 s = PyString_AsString(po); |
| 0 | 144 c = (DCchar) s[0]; |
| 145 } | |
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146 else if ( PyInt_Check(po) ) |
| 0 | 147 { |
| 148 long l; | |
| 149 l = PyInt_AsLong(po); | |
| 150 if ( (l > CHAR_MAX) || (l < CHAR_MIN)) return PyErr_Format( PyExc_RuntimeError, "value out of range at argument %d - expecting a char code", index ); | |
| 151 c = (DCchar) l; | |
| 152 } | |
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153 else return PyErr_Format( PyExc_RuntimeError, "argument mismatch at pos %d - expecting a char", index ); |
| 0 | 154 dcArgChar(gpCall, c); |
| 155 } | |
| 156 break; | |
| 157 case DC_SIGCHAR_SHORT: | |
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158 case DC_SIGCHAR_USHORT: |
| 0 | 159 { |
| 160 DCshort s; | |
| 161 long v; | |
| 162 if ( !PyInt_Check(po) ) | |
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163 return PyErr_Format( PyExc_RuntimeError, "argument mismatch at pos %d - expecting a short int", index ); |
| 0 | 164 v = PyInt_AS_LONG(po); |
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165 if ( (v < SHRT_MIN) || (v > SHRT_MAX) ) |
| 0 | 166 return PyErr_Format( PyExc_RuntimeError, "value out of range at argument %d - expecting a short value", index ); |
| 167 s = (DCshort) v; | |
| 168 dcArgShort(gpCall, s); | |
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169 } |
| 0 | 170 break; |
| 171 case DC_SIGCHAR_INT: | |
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172 case DC_SIGCHAR_UINT: |
| 0 | 173 { |
| 174 long v; | |
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175 if ( !PyInt_Check(po) ) return PyErr_Format( PyExc_RuntimeError, "argument mismatch at pos %d - expecting an int", index ); |
| 0 | 176 v = PyInt_AS_LONG(po); |
| 177 dcArgInt(gpCall, (DCint) v ); | |
| 178 } | |
| 179 break; | |
| 180 case DC_SIGCHAR_LONG: | |
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181 case DC_SIGCHAR_ULONG: |
| 0 | 182 { |
| 183 long v; | |
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184 if ( !PyInt_Check(po) ) return PyErr_Format( PyExc_RuntimeError, "argument mismatch at pos %d - expecting an int", index ); |
| 0 | 185 v = PyInt_AsLong(po); |
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186 |
| 0 | 187 } |
| 188 break; | |
| 189 case DC_SIGCHAR_LONGLONG: | |
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190 case DC_SIGCHAR_ULONGLONG: |
| 0 | 191 { |
| 192 PY_LONG_LONG pl; | |
| 193 DClonglong dl; | |
| 194 if ( !PyLong_Check(po) ) return PyErr_Format( PyExc_RuntimeError, "argument mismatch at pos %d - expecting a long long", index ); | |
| 195 pl = PyLong_AsLongLong(po); | |
| 196 dl = (DClonglong) pl; | |
| 197 dcArgLongLong(gpCall, dl ); | |
| 198 } | |
| 199 break; | |
| 200 case DC_SIGCHAR_FLOAT: | |
| 201 { | |
| 202 DCfloat f; | |
| 203 if (!PyFloat_Check(po)) return PyErr_Format( PyExc_RuntimeError, "argument mismatch at pos %d - expeecting a float", index ); | |
| 204 f = (float) PyFloat_AsDouble(po); | |
| 205 dcArgFloat(gpCall, f); | |
| 206 } | |
| 207 break; | |
| 208 case DC_SIGCHAR_DOUBLE: | |
| 209 { | |
| 210 double d; | |
| 211 if (!PyFloat_Check(po)) return PyErr_Format( PyExc_RuntimeError, "argument mismatch at pos %d - expeecting a float", index ); | |
| 212 d = PyFloat_AsDouble(po); | |
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213 dcArgDouble(gpCall, d); |
| 0 | 214 } |
| 215 break; | |
| 216 case DC_SIGCHAR_POINTER: | |
| 217 { | |
| 218 DCpointer ptr; | |
| 219 if ( PyString_Check(po) ) { | |
| 220 ptr = (DCpointer) PyString_AsString(po); | |
| 221 } else if ( PyLong_Check(po) ) { | |
| 222 ptr = (DCpointer) ( (DCint) PyLong_AsLongLong(po) ); | |
| 223 } else { | |
| 224 return PyErr_Format( PyExc_RuntimeError, "argument mismatch at pos %d - expecting a promoting pointer-type (int,string)", index ); | |
| 225 } | |
| 226 dcArgPointer(gpCall, ptr ); | |
| 227 } | |
| 228 break; | |
| 5 | 229 case DC_SIGCHAR_STRING: |
| 0 | 230 { |
| 231 char* p; | |
| 232 if (!PyString_Check(po) ) return PyErr_Format( PyExc_RuntimeError, "argument mismatch at pos %d - expecting a string", index ); | |
| 233 p = PyString_AsString(po); | |
| 234 dcArgPointer(gpCall, (DCpointer) p ); | |
| 235 } | |
| 236 break; | |
| 237 default: return PyErr_Format( PyExc_RuntimeError, "unknown signature character '%c'", ch); | |
| 238 } | |
| 239 | |
| 240 ++pos; ++ptr; | |
| 241 | |
| 242 } | |
| 243 | |
| 244 if (pos != l) return PyErr_Format( PyExc_RuntimeError, "too many arguments"); | |
| 245 | |
| 246 if (ch == '\0') return PyErr_Format( PyExc_RuntimeError, "return value missing in signature"); | |
| 247 | |
| 248 ch = *++ptr; | |
| 249 | |
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250 switch(ch) |
| 0 | 251 { |
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252 case DC_SIGCHAR_VOID: dcCallVoid (gpCall, pfunc); Py_RETURN_NONE; |
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253 case DC_SIGCHAR_BOOL: return Py_BuildValue("i", dcCallBool (gpCall, pfunc)); |
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254 case DC_SIGCHAR_CHAR: return Py_BuildValue("b", dcCallChar (gpCall, pfunc)); |
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255 case DC_SIGCHAR_UCHAR: return Py_BuildValue("B", dcCallChar (gpCall, pfunc)); |
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256 case DC_SIGCHAR_SHORT: return Py_BuildValue("h", dcCallShort (gpCall, pfunc)); |
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257 case DC_SIGCHAR_USHORT: return Py_BuildValue("H", dcCallShort (gpCall, pfunc)); |
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258 case DC_SIGCHAR_INT: return Py_BuildValue("i", dcCallInt (gpCall, pfunc)); |
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259 case DC_SIGCHAR_UINT: return Py_BuildValue("I", dcCallInt (gpCall, pfunc)); |
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260 case DC_SIGCHAR_LONG: return Py_BuildValue("l", dcCallLong (gpCall, pfunc)); |
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261 case DC_SIGCHAR_ULONG: return Py_BuildValue("k", dcCallLong (gpCall, pfunc)); |
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262 case DC_SIGCHAR_LONGLONG: return Py_BuildValue("L", dcCallLongLong(gpCall, pfunc)); |
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263 case DC_SIGCHAR_ULONGLONG: return Py_BuildValue("K", dcCallLongLong(gpCall, pfunc)); |
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264 case DC_SIGCHAR_FLOAT: return Py_BuildValue("f", dcCallFloat (gpCall, pfunc)); |
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265 case DC_SIGCHAR_DOUBLE: return Py_BuildValue("d", dcCallDouble (gpCall, pfunc)); |
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266 case DC_SIGCHAR_STRING: return Py_BuildValue("s", dcCallPointer (gpCall, pfunc)); |
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267 case DC_SIGCHAR_POINTER: return Py_BuildValue("p", dcCallPointer (gpCall, pfunc)); // @@@ probably not working, there is no "p" |
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268 default: return PyErr_Format(PyExc_RuntimeError, "invalid return type signature"); |
| 0 | 269 } |
| 270 } | |
| 271 | |
| 272 | |
| 273 static PyMethodDef pydcMethods[] = { | |
| 274 {"load", pydc_load, METH_VARARGS, "load library"}, | |
| 275 {"find", pydc_find, METH_VARARGS, "find symbols"}, | |
| 276 {"free", pydc_free, METH_VARARGS, "free library"}, | |
| 277 {"call", pydc_call, METH_VARARGS, "call function"}, | |
| 278 {NULL,NULL,0,NULL} | |
| 279 }; | |
| 280 | |
| 281 PyMODINIT_FUNC | |
| 282 initpydcext(void) | |
| 283 { | |
| 284 PyObject* m; | |
| 285 m = Py_InitModule("pydcext", pydcMethods); | |
| 286 if (m == NULL) | |
| 287 return; | |
| 288 gpCall = dcNewCallVM(4096); | |
| 289 } | |
| 290 |