/* New getargs implementation */ #define PY_CXX_CONST const #include "Python.h" #include "pycore_abstract.h" // _PyNumber_Index() #include "pycore_dict.h" // _PyDict_HasOnlyStringKeys() #include "pycore_modsupport.h" // export _PyArg_NoKeywords() #include "pycore_pylifecycle.h" // _PyArg_Fini #include "pycore_pystate.h" // _Py_IsMainInterpreter() #include "pycore_tuple.h" // _PyTuple_ITEMS() #include "pycore_pyerrors.h" // _Py_CalculateSuggestions() /* Export Stable ABIs (abi only) */ PyAPI_FUNC(int) _PyArg_Parse_SizeT(PyObject *, const char *, ...); PyAPI_FUNC(int) _PyArg_ParseTuple_SizeT(PyObject *, const char *, ...); PyAPI_FUNC(int) _PyArg_ParseTupleAndKeywords_SizeT(PyObject *, PyObject *, const char *, const char * const *, ...); PyAPI_FUNC(int) _PyArg_VaParse_SizeT(PyObject *, const char *, va_list); PyAPI_FUNC(int) _PyArg_VaParseTupleAndKeywords_SizeT(PyObject *, PyObject *, const char *, const char * const *, va_list); #define FLAG_COMPAT 1 typedef int (*destr_t)(PyObject *, void *); /* Keep track of "objects" that have been allocated or initialized and which will need to be deallocated or cleaned up somehow if overall parsing fails. */ typedef struct { void *item; destr_t destructor; } freelistentry_t; typedef struct { freelistentry_t *entries; int first_available; int entries_malloced; } freelist_t; #define STATIC_FREELIST_ENTRIES 8 /* Forward */ static int vgetargs1_impl(PyObject *args, PyObject *const *stack, Py_ssize_t nargs, const char *format, va_list *p_va, int flags); static int vgetargs1(PyObject *, const char *, va_list *, int); static void seterror(Py_ssize_t, const char *, int *, const char *, const char *); static const char *convertitem(PyObject *, const char **, va_list *, int, int *, char *, size_t, freelist_t *); static const char *converttuple(PyObject *, const char **, va_list *, int, int *, char *, size_t, freelist_t *); static const char *convertsimple(PyObject *, const char **, va_list *, int, char *, size_t, freelist_t *); static Py_ssize_t convertbuffer(PyObject *, const void **p, const char **); static int getbuffer(PyObject *, Py_buffer *, const char**); static int vgetargskeywords(PyObject *, PyObject *, const char *, const char * const *, va_list *, int); static int vgetargskeywordsfast(PyObject *, PyObject *, struct _PyArg_Parser *, va_list *, int); static int vgetargskeywordsfast_impl(PyObject *const *args, Py_ssize_t nargs, PyObject *keywords, PyObject *kwnames, struct _PyArg_Parser *parser, va_list *p_va, int flags); static const char *skipitem(const char **, va_list *, int); int PyArg_Parse(PyObject *args, const char *format, ...) { int retval; va_list va; va_start(va, format); retval = vgetargs1(args, format, &va, FLAG_COMPAT); va_end(va); return retval; } PyAPI_FUNC(int) _PyArg_Parse_SizeT(PyObject *args, const char *format, ...) { int retval; va_list va; va_start(va, format); retval = vgetargs1(args, format, &va, FLAG_COMPAT); va_end(va); return retval; } int PyArg_ParseTuple(PyObject *args, const char *format, ...) { int retval; va_list va; va_start(va, format); retval = vgetargs1(args, format, &va, 0); va_end(va); return retval; } int _PyArg_ParseTuple_SizeT(PyObject *args, const char *format, ...) { int retval; va_list va; va_start(va, format); retval = vgetargs1(args, format, &va, 0); va_end(va); return retval; } int _PyArg_ParseStack(PyObject *const *args, Py_ssize_t nargs, const char *format, ...) { int retval; va_list va; va_start(va, format); retval = vgetargs1_impl(NULL, args, nargs, format, &va, 0); va_end(va); return retval; } int PyArg_VaParse(PyObject *args, const char *format, va_list va) { va_list lva; int retval; va_copy(lva, va); retval = vgetargs1(args, format, &lva, 0); va_end(lva); return retval; } int _PyArg_VaParse_SizeT(PyObject *args, const char *format, va_list va) { va_list lva; int retval; va_copy(lva, va); retval = vgetargs1(args, format, &lva, 0); va_end(lva); return retval; } /* Handle cleanup of allocated memory in case of exception */ static int cleanup_ptr(PyObject *self, void *ptr) { void **pptr = (void **)ptr; PyMem_Free(*pptr); *pptr = NULL; return 0; } static int cleanup_buffer(PyObject *self, void *ptr) { Py_buffer *buf = (Py_buffer *)ptr; if (buf) { PyBuffer_Release(buf); } return 0; } static int addcleanup(void *ptr, freelist_t *freelist, destr_t destructor) { int index; index = freelist->first_available; freelist->first_available += 1; freelist->entries[index].item = ptr; freelist->entries[index].destructor = destructor; return 0; } static int cleanreturn(int retval, freelist_t *freelist) { int index; if (retval == 0) { /* A failure occurred, therefore execute all of the cleanup functions. */ for (index = 0; index < freelist->first_available; ++index) { freelist->entries[index].destructor(NULL, freelist->entries[index].item); } } if (freelist->entries_malloced) PyMem_Free(freelist->entries); return retval; } static int vgetargs1_impl(PyObject *compat_args, PyObject *const *stack, Py_ssize_t nargs, const char *format, va_list *p_va, int flags) { char msgbuf[256]; int levels[32]; const char *fname = NULL; const char *message = NULL; int min = -1; int max = 0; int level = 0; int endfmt = 0; const char *formatsave = format; Py_ssize_t i; const char *msg; int compat = flags & FLAG_COMPAT; freelistentry_t static_entries[STATIC_FREELIST_ENTRIES]; freelist_t freelist; assert(nargs == 0 || stack != NULL); freelist.entries = static_entries; freelist.first_available = 0; freelist.entries_malloced = 0; flags = flags & ~FLAG_COMPAT; while (endfmt == 0) { int c = *format++; switch (c) { case '(': if (level == 0) max++; level++; if (level >= 30) Py_FatalError("too many tuple nesting levels " "in argument format string"); break; case ')': if (level == 0) Py_FatalError("excess ')' in getargs format"); else level--; break; case '\0': endfmt = 1; break; case ':': fname = format; endfmt = 1; break; case ';': message = format; endfmt = 1; break; case '|': if (level == 0) min = max; break; default: if (level == 0) { if (Py_ISALPHA(c)) if (c != 'e') /* skip encoded */ max++; } break; } } if (level != 0) Py_FatalError(/* '(' */ "missing ')' in getargs format"); if (min < 0) min = max; format = formatsave; if (max > STATIC_FREELIST_ENTRIES) { freelist.entries = PyMem_NEW(freelistentry_t, max); if (freelist.entries == NULL) { PyErr_NoMemory(); return 0; } freelist.entries_malloced = 1; } if (compat) { if (max == 0) { if (compat_args == NULL) return 1; PyErr_Format(PyExc_TypeError, "%.200s%s takes no arguments", fname==NULL ? "function" : fname, fname==NULL ? "" : "()"); return cleanreturn(0, &freelist); } else if (min == 1 && max == 1) { if (compat_args == NULL) { PyErr_Format(PyExc_TypeError, "%.200s%s takes at least one argument", fname==NULL ? "function" : fname, fname==NULL ? "" : "()"); return cleanreturn(0, &freelist); } msg = convertitem(compat_args, &format, p_va, flags, levels, msgbuf, sizeof(msgbuf), &freelist); if (msg == NULL) return cleanreturn(1, &freelist); seterror(levels[0], msg, levels+1, fname, message); return cleanreturn(0, &freelist); } else { PyErr_SetString(PyExc_SystemError, "old style getargs format uses new features"); return cleanreturn(0, &freelist); } } if (nargs < min || max < nargs) { if (message == NULL) PyErr_Format(PyExc_TypeError, "%.150s%s takes %s %d argument%s (%zd given)", fname==NULL ? "function" : fname, fname==NULL ? "" : "()", min==max ? "exactly" : nargs < min ? "at least" : "at most", nargs < min ? min : max, (nargs < min ? min : max) == 1 ? "" : "s", nargs); else PyErr_SetString(PyExc_TypeError, message); return cleanreturn(0, &freelist); } for (i = 0; i < nargs; i++) { if (*format == '|') format++; msg = convertitem(stack[i], &format, p_va, flags, levels, msgbuf, sizeof(msgbuf), &freelist); if (msg) { seterror(i+1, msg, levels, fname, message); return cleanreturn(0, &freelist); } } if (*format != '\0' && !Py_ISALPHA(*format) && *format != '(' && *format != '|' && *format != ':' && *format != ';') { PyErr_Format(PyExc_SystemError, "bad format string: %.200s", formatsave); return cleanreturn(0, &freelist); } return cleanreturn(1, &freelist); } static int vgetargs1(PyObject *args, const char *format, va_list *p_va, int flags) { PyObject **stack; Py_ssize_t nargs; if (!(flags & FLAG_COMPAT)) { assert(args != NULL); if (!PyTuple_Check(args)) { PyErr_SetString(PyExc_SystemError, "new style getargs format but argument is not a tuple"); return 0; } stack = _PyTuple_ITEMS(args); nargs = PyTuple_GET_SIZE(args); } else { stack = NULL; nargs = 0; } return vgetargs1_impl(args, stack, nargs, format, p_va, flags); } static void seterror(Py_ssize_t iarg, const char *msg, int *levels, const char *fname, const char *message) { char buf[512]; int i; char *p = buf; if (PyErr_Occurred()) return; else if (message == NULL) { if (fname != NULL) { PyOS_snprintf(p, sizeof(buf), "%.200s() ", fname); p += strlen(p); } if (iarg != 0) { PyOS_snprintf(p, sizeof(buf) - (p - buf), "argument %zd", iarg); i = 0; p += strlen(p); while (i < 32 && levels[i] > 0 && (int)(p-buf) < 220) { PyOS_snprintf(p, sizeof(buf) - (p - buf), ", item %d", levels[i]-1); p += strlen(p); i++; } } else { PyOS_snprintf(p, sizeof(buf) - (p - buf), "argument"); p += strlen(p); } PyOS_snprintf(p, sizeof(buf) - (p - buf), " %.256s", msg); message = buf; } if (msg[0] == '(') { PyErr_SetString(PyExc_SystemError, message); } else { PyErr_SetString(PyExc_TypeError, message); } } /* Convert a tuple argument. On entry, *p_format points to the character _after_ the opening '('. On successful exit, *p_format points to the closing ')'. If successful: *p_format and *p_va are updated, *levels and *msgbuf are untouched, and NULL is returned. If the argument is invalid: *p_format is unchanged, *p_va is undefined, *levels is a 0-terminated list of item numbers, *msgbuf contains an error message, whose format is: "must be , not ", where: is the name of the expected type, and is the name of the actual type, and msgbuf is returned. */ static const char * converttuple(PyObject *arg, const char **p_format, va_list *p_va, int flags, int *levels, char *msgbuf, size_t bufsize, freelist_t *freelist) { int level = 0; int n = 0; const char *format = *p_format; int i; Py_ssize_t len; for (;;) { int c = *format++; if (c == '(') { if (level == 0) n++; level++; } else if (c == ')') { if (level == 0) break; level--; } else if (c == ':' || c == ';' || c == '\0') break; else if (level == 0 && Py_ISALPHA(c) && c != 'e') n++; } if (!PySequence_Check(arg) || PyBytes_Check(arg)) { levels[0] = 0; PyOS_snprintf(msgbuf, bufsize, "must be %d-item sequence, not %.50s", n, arg == Py_None ? "None" : Py_TYPE(arg)->tp_name); return msgbuf; } len = PySequence_Size(arg); if (len != n) { levels[0] = 0; PyOS_snprintf(msgbuf, bufsize, "must be sequence of length %d, not %zd", n, len); return msgbuf; } format = *p_format; for (i = 0; i < n; i++) { const char *msg; PyObject *item; item = PySequence_GetItem(arg, i); if (item == NULL) { PyErr_Clear(); levels[0] = i+1; levels[1] = 0; strncpy(msgbuf, "is not retrievable", bufsize); return msgbuf; } msg = convertitem(item, &format, p_va, flags, levels+1, msgbuf, bufsize, freelist); /* PySequence_GetItem calls tp->sq_item, which INCREFs */ Py_XDECREF(item); if (msg != NULL) { levels[0] = i+1; return msg; } } *p_format = format; return NULL; } /* Convert a single item. */ static const char * convertitem(PyObject *arg, const char **p_format, va_list *p_va, int flags, int *levels, char *msgbuf, size_t bufsize, freelist_t *freelist) { const char *msg; const char *format = *p_format; if (*format == '(' /* ')' */) { format++; msg = converttuple(arg, &format, p_va, flags, levels, msgbuf, bufsize, freelist); if (msg == NULL) format++; } else { msg = convertsimple(arg, &format, p_va, flags, msgbuf, bufsize, freelist); if (msg != NULL) levels[0] = 0; } if (msg == NULL) *p_format = format; return msg; } /* Format an error message generated by convertsimple(). displayname must be UTF-8 encoded. */ void _PyArg_BadArgument(const char *fname, const char *displayname, const char *expected, PyObject *arg) { PyErr_Format(PyExc_TypeError, "%.200s() %.200s must be %.50s, not %.50s", fname, displayname, expected, arg == Py_None ? "None" : Py_TYPE(arg)->tp_name); } static const char * converterr(const char *expected, PyObject *arg, char *msgbuf, size_t bufsize) { assert(expected != NULL); assert(arg != NULL); if (expected[0] == '(') { PyOS_snprintf(msgbuf, bufsize, "%.100s", expected); } else { PyOS_snprintf(msgbuf, bufsize, "must be %.50s, not %.50s", expected, arg == Py_None ? "None" : Py_TYPE(arg)->tp_name); } return msgbuf; } static const char * convertcharerr(const char *expected, const char *what, Py_ssize_t size, char *msgbuf, size_t bufsize) { assert(expected != NULL); PyOS_snprintf(msgbuf, bufsize, "must be %.50s, not %.50s of length %zd", expected, what, size); return msgbuf; } #define CONV_UNICODE "(unicode conversion error)" /* Convert a non-tuple argument. Return NULL if conversion went OK, or a string with a message describing the failure. The message is formatted as "must be , not ". When failing, an exception may or may not have been raised. Don't call if a tuple is expected. When you add new format codes, please don't forget poor skipitem() below. */ static const char * convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags, char *msgbuf, size_t bufsize, freelist_t *freelist) { #define RETURN_ERR_OCCURRED return msgbuf const char *format = *p_format; char c = *format++; const char *sarg; switch (c) { case 'b': { /* unsigned byte -- very short int */ unsigned char *p = va_arg(*p_va, unsigned char *); long ival = PyLong_AsLong(arg); if (ival == -1 && PyErr_Occurred()) RETURN_ERR_OCCURRED; else if (ival < 0) { PyErr_SetString(PyExc_OverflowError, "unsigned byte integer is less than minimum"); RETURN_ERR_OCCURRED; } else if (ival > UCHAR_MAX) { PyErr_SetString(PyExc_OverflowError, "unsigned byte integer is greater than maximum"); RETURN_ERR_OCCURRED; } else *p = (unsigned char) ival; break; } case 'B': {/* byte sized bitfield - both signed and unsigned values allowed */ unsigned char *p = va_arg(*p_va, unsigned char *); unsigned long ival = PyLong_AsUnsignedLongMask(arg); if (ival == (unsigned long)-1 && PyErr_Occurred()) RETURN_ERR_OCCURRED; else *p = (unsigned char) ival; break; } case 'h': {/* signed short int */ short *p = va_arg(*p_va, short *); long ival = PyLong_AsLong(arg); if (ival == -1 && PyErr_Occurred()) RETURN_ERR_OCCURRED; else if (ival < SHRT_MIN) { PyErr_SetString(PyExc_OverflowError, "signed short integer is less than minimum"); RETURN_ERR_OCCURRED; } else if (ival > SHRT_MAX) { PyErr_SetString(PyExc_OverflowError, "signed short integer is greater than maximum"); RETURN_ERR_OCCURRED; } else *p = (short) ival; break; } case 'H': { /* short int sized bitfield, both signed and unsigned allowed */ unsigned short *p = va_arg(*p_va, unsigned short *); unsigned long ival = PyLong_AsUnsignedLongMask(arg); if (ival == (unsigned long)-1 && PyErr_Occurred()) RETURN_ERR_OCCURRED; else *p = (unsigned short) ival; break; } case 'i': {/* signed int */ int *p = va_arg(*p_va, int *); long ival = PyLong_AsLong(arg); if (ival == -1 && PyErr_Occurred()) RETURN_ERR_OCCURRED; else if (ival > INT_MAX) { PyErr_SetString(PyExc_OverflowError, "signed integer is greater than maximum"); RETURN_ERR_OCCURRED; } else if (ival < INT_MIN) { PyErr_SetString(PyExc_OverflowError, "signed integer is less than minimum"); RETURN_ERR_OCCURRED; } else *p = ival; break; } case 'I': { /* int sized bitfield, both signed and unsigned allowed */ unsigned int *p = va_arg(*p_va, unsigned int *); unsigned long ival = PyLong_AsUnsignedLongMask(arg); if (ival == (unsigned long)-1 && PyErr_Occurred()) RETURN_ERR_OCCURRED; else *p = (unsigned int) ival; break; } case 'n': /* Py_ssize_t */ { PyObject *iobj; Py_ssize_t *p = va_arg(*p_va, Py_ssize_t *); Py_ssize_t ival = -1; iobj = _PyNumber_Index(arg); if (iobj != NULL) { ival = PyLong_AsSsize_t(iobj); Py_DECREF(iobj); } if (ival == -1 && PyErr_Occurred()) RETURN_ERR_OCCURRED; *p = ival; break; } case 'l': {/* long int */ long *p = va_arg(*p_va, long *); long ival = PyLong_AsLong(arg); if (ival == -1 && PyErr_Occurred()) RETURN_ERR_OCCURRED; else *p = ival; break; } case 'k': { /* long sized bitfield */ unsigned long *p = va_arg(*p_va, unsigned long *); unsigned long ival; if (PyLong_Check(arg)) ival = PyLong_AsUnsignedLongMask(arg); else return converterr("int", arg, msgbuf, bufsize); *p = ival; break; } case 'L': {/* long long */ long long *p = va_arg( *p_va, long long * ); long long ival = PyLong_AsLongLong(arg); if (ival == (long long)-1 && PyErr_Occurred()) RETURN_ERR_OCCURRED; else *p = ival; break; } case 'K': { /* long long sized bitfield */ unsigned long long *p = va_arg(*p_va, unsigned long long *); unsigned long long ival; if (PyLong_Check(arg)) ival = PyLong_AsUnsignedLongLongMask(arg); else return converterr("int", arg, msgbuf, bufsize); *p = ival; break; } case 'f': {/* float */ float *p = va_arg(*p_va, float *); double dval = PyFloat_AsDouble(arg); if (dval == -1.0 && PyErr_Occurred()) RETURN_ERR_OCCURRED; else *p = (float) dval; break; } case 'd': {/* double */ double *p = va_arg(*p_va, double *); double dval = PyFloat_AsDouble(arg); if (dval == -1.0 && PyErr_Occurred()) RETURN_ERR_OCCURRED; else *p = dval; break; } case 'D': {/* complex double */ Py_complex *p = va_arg(*p_va, Py_complex *); Py_complex cval; cval = PyComplex_AsCComplex(arg); if (PyErr_Occurred()) RETURN_ERR_OCCURRED; else *p = cval; break; } case 'c': {/* char */ char *p = va_arg(*p_va, char *); if (PyBytes_Check(arg)) { if (PyBytes_GET_SIZE(arg) != 1) { return convertcharerr("a byte string of length 1", "a bytes object", PyBytes_GET_SIZE(arg), msgbuf, bufsize); } *p = PyBytes_AS_STRING(arg)[0]; } else if (PyByteArray_Check(arg)) { if (PyByteArray_GET_SIZE(arg) != 1) { return convertcharerr("a byte string of length 1", "a bytearray object", PyByteArray_GET_SIZE(arg), msgbuf, bufsize); } *p = PyByteArray_AS_STRING(arg)[0]; } else return converterr("a byte string of length 1", arg, msgbuf, bufsize); break; } case 'C': {/* unicode char */ int *p = va_arg(*p_va, int *); int kind; const void *data; if (!PyUnicode_Check(arg)) return converterr("a unicode character", arg, msgbuf, bufsize); if (PyUnicode_GET_LENGTH(arg) != 1) { return convertcharerr("a unicode character", "a string", PyUnicode_GET_LENGTH(arg), msgbuf, bufsize); } kind = PyUnicode_KIND(arg); data = PyUnicode_DATA(arg); *p = PyUnicode_READ(kind, data, 0); break; } case 'p': {/* boolean *p*redicate */ int *p = va_arg(*p_va, int *); int val = PyObject_IsTrue(arg); if (val > 0) *p = 1; else if (val == 0) *p = 0; else RETURN_ERR_OCCURRED; break; } /* XXX WAAAAH! 's', 'y', 'z', 'u', 'Z', 'e', 'w' codes all need to be cleaned up! */ case 'y': {/* any bytes-like object */ void **p = (void **)va_arg(*p_va, char **); const char *buf; Py_ssize_t count; if (*format == '*') { if (getbuffer(arg, (Py_buffer*)p, &buf) < 0) return converterr(buf, arg, msgbuf, bufsize); format++; if (addcleanup(p, freelist, cleanup_buffer)) { return converterr( "(cleanup problem)", arg, msgbuf, bufsize); } break; } count = convertbuffer(arg, (const void **)p, &buf); if (count < 0) return converterr(buf, arg, msgbuf, bufsize); if (*format == '#') { Py_ssize_t *psize = va_arg(*p_va, Py_ssize_t*); *psize = count; format++; } else { if (strlen(*p) != (size_t)count) { PyErr_SetString(PyExc_ValueError, "embedded null byte"); RETURN_ERR_OCCURRED; } } break; } case 's': /* text string or bytes-like object */ case 'z': /* text string, bytes-like object or None */ { if (*format == '*') { /* "s*" or "z*" */ Py_buffer *p = (Py_buffer *)va_arg(*p_va, Py_buffer *); if (c == 'z' && arg == Py_None) PyBuffer_FillInfo(p, NULL, NULL, 0, 1, 0); else if (PyUnicode_Check(arg)) { Py_ssize_t len; sarg = PyUnicode_AsUTF8AndSize(arg, &len); if (sarg == NULL) return converterr(CONV_UNICODE, arg, msgbuf, bufsize); PyBuffer_FillInfo(p, arg, (void *)sarg, len, 1, 0); } else { /* any bytes-like object */ const char *buf; if (getbuffer(arg, p, &buf) < 0) return converterr(buf, arg, msgbuf, bufsize); } if (addcleanup(p, freelist, cleanup_buffer)) { return converterr( "(cleanup problem)", arg, msgbuf, bufsize); } format++; } else if (*format == '#') { /* a string or read-only bytes-like object */ /* "s#" or "z#" */ const void **p = (const void **)va_arg(*p_va, const char **); Py_ssize_t *psize = va_arg(*p_va, Py_ssize_t*); if (c == 'z' && arg == Py_None) { *p = NULL; *psize = 0; } else if (PyUnicode_Check(arg)) { Py_ssize_t len; sarg = PyUnicode_AsUTF8AndSize(arg, &len); if (sarg == NULL) return converterr(CONV_UNICODE, arg, msgbuf, bufsize); *p = sarg; *psize = len; } else { /* read-only bytes-like object */ /* XXX Really? */ const char *buf; Py_ssize_t count = convertbuffer(arg, p, &buf); if (count < 0) return converterr(buf, arg, msgbuf, bufsize); *psize = count; } format++; } else { /* "s" or "z" */ const char **p = va_arg(*p_va, const char **); Py_ssize_t len; sarg = NULL; if (c == 'z' && arg == Py_None) *p = NULL; else if (PyUnicode_Check(arg)) { sarg = PyUnicode_AsUTF8AndSize(arg, &len); if (sarg == NULL) return converterr(CONV_UNICODE, arg, msgbuf, bufsize); if (strlen(sarg) != (size_t)len) { PyErr_SetString(PyExc_ValueError, "embedded null character"); RETURN_ERR_OCCURRED; } *p = sarg; } else return converterr(c == 'z' ? "str or None" : "str", arg, msgbuf, bufsize); } break; } case 'e': {/* encoded string */ char **buffer; const char *encoding; PyObject *s; int recode_strings; Py_ssize_t size; const char *ptr; /* Get 'e' parameter: the encoding name */ encoding = (const char *)va_arg(*p_va, const char *); if (encoding == NULL) encoding = PyUnicode_GetDefaultEncoding(); /* Get output buffer parameter: 's' (recode all objects via Unicode) or 't' (only recode non-string objects) */ if (*format == 's') recode_strings = 1; else if (*format == 't') recode_strings = 0; else return converterr( "(unknown parser marker combination)", arg, msgbuf, bufsize); buffer = (char **)va_arg(*p_va, char **); format++; if (buffer == NULL) return converterr("(buffer is NULL)", arg, msgbuf, bufsize); /* Encode object */ if (!recode_strings && (PyBytes_Check(arg) || PyByteArray_Check(arg))) { s = Py_NewRef(arg); if (PyBytes_Check(arg)) { size = PyBytes_GET_SIZE(s); ptr = PyBytes_AS_STRING(s); } else { size = PyByteArray_GET_SIZE(s); ptr = PyByteArray_AS_STRING(s); } } else if (PyUnicode_Check(arg)) { /* Encode object; use default error handling */ s = PyUnicode_AsEncodedString(arg, encoding, NULL); if (s == NULL) return converterr("(encoding failed)", arg, msgbuf, bufsize); assert(PyBytes_Check(s)); size = PyBytes_GET_SIZE(s); ptr = PyBytes_AS_STRING(s); if (ptr == NULL) ptr = ""; } else { return converterr( recode_strings ? "str" : "str, bytes or bytearray", arg, msgbuf, bufsize); } /* Write output; output is guaranteed to be 0-terminated */ if (*format == '#') { /* Using buffer length parameter '#': - if *buffer is NULL, a new buffer of the needed size is allocated and the data copied into it; *buffer is updated to point to the new buffer; the caller is responsible for PyMem_Free()ing it after usage - if *buffer is not NULL, the data is copied to *buffer; *buffer_len has to be set to the size of the buffer on input; buffer overflow is signalled with an error; buffer has to provide enough room for the encoded string plus the trailing 0-byte - in both cases, *buffer_len is updated to the size of the buffer /excluding/ the trailing 0-byte */ Py_ssize_t *psize = va_arg(*p_va, Py_ssize_t*); format++; if (psize == NULL) { Py_DECREF(s); return converterr( "(buffer_len is NULL)", arg, msgbuf, bufsize); } if (*buffer == NULL) { *buffer = PyMem_NEW(char, size + 1); if (*buffer == NULL) { Py_DECREF(s); PyErr_NoMemory(); RETURN_ERR_OCCURRED; } if (addcleanup(buffer, freelist, cleanup_ptr)) { Py_DECREF(s); return converterr( "(cleanup problem)", arg, msgbuf, bufsize); } } else { if (size + 1 > *psize) { Py_DECREF(s); PyErr_Format(PyExc_ValueError, "encoded string too long " "(%zd, maximum length %zd)", (Py_ssize_t)size, (Py_ssize_t)(*psize - 1)); RETURN_ERR_OCCURRED; } } memcpy(*buffer, ptr, size+1); *psize = size; } else { /* Using a 0-terminated buffer: - the encoded string has to be 0-terminated for this variant to work; if it is not, an error raised - a new buffer of the needed size is allocated and the data copied into it; *buffer is updated to point to the new buffer; the caller is responsible for PyMem_Free()ing it after usage */ if ((Py_ssize_t)strlen(ptr) != size) { Py_DECREF(s); return converterr( "encoded string without null bytes", arg, msgbuf, bufsize); } *buffer = PyMem_NEW(char, size + 1); if (*buffer == NULL) { Py_DECREF(s); PyErr_NoMemory(); RETURN_ERR_OCCURRED; } if (addcleanup(buffer, freelist, cleanup_ptr)) { Py_DECREF(s); return converterr("(cleanup problem)", arg, msgbuf, bufsize); } memcpy(*buffer, ptr, size+1); } Py_DECREF(s); break; } case 'S': { /* PyBytes object */ PyObject **p = va_arg(*p_va, PyObject **); if (PyBytes_Check(arg)) *p = arg; else return converterr("bytes", arg, msgbuf, bufsize); break; } case 'Y': { /* PyByteArray object */ PyObject **p = va_arg(*p_va, PyObject **); if (PyByteArray_Check(arg)) *p = arg; else return converterr("bytearray", arg, msgbuf, bufsize); break; } case 'U': { /* PyUnicode object */ PyObject **p = va_arg(*p_va, PyObject **); if (PyUnicode_Check(arg)) { *p = arg; } else return converterr("str", arg, msgbuf, bufsize); break; } case 'O': { /* object */ PyTypeObject *type; PyObject **p; if (*format == '!') { type = va_arg(*p_va, PyTypeObject*); p = va_arg(*p_va, PyObject **); format++; if (PyType_IsSubtype(Py_TYPE(arg), type)) *p = arg; else return converterr(type->tp_name, arg, msgbuf, bufsize); } else if (*format == '&') { typedef int (*converter)(PyObject *, void *); converter convert = va_arg(*p_va, converter); void *addr = va_arg(*p_va, void *); int res; format++; if (! (res = (*convert)(arg, addr))) return converterr("(unspecified)", arg, msgbuf, bufsize); if (res == Py_CLEANUP_SUPPORTED && addcleanup(addr, freelist, convert) == -1) return converterr("(cleanup problem)", arg, msgbuf, bufsize); } else { p = va_arg(*p_va, PyObject **); *p = arg; } break; } case 'w': { /* "w*": memory buffer, read-write access */ void **p = va_arg(*p_va, void **); if (*format != '*') return converterr( "(invalid use of 'w' format character)", arg, msgbuf, bufsize); format++; /* Caller is interested in Py_buffer, and the object supports it directly. The request implicitly asks for PyBUF_SIMPLE, so the result is C-contiguous with format 'B'. */ if (PyObject_GetBuffer(arg, (Py_buffer*)p, PyBUF_WRITABLE) < 0) { PyErr_Clear(); return converterr("read-write bytes-like object", arg, msgbuf, bufsize); } assert(PyBuffer_IsContiguous((Py_buffer *)p, 'C')); if (addcleanup(p, freelist, cleanup_buffer)) { return converterr( "(cleanup problem)", arg, msgbuf, bufsize); } break; } default: return converterr("(impossible)", arg, msgbuf, bufsize); } *p_format = format; return NULL; #undef RETURN_ERR_OCCURRED } static Py_ssize_t convertbuffer(PyObject *arg, const void **p, const char **errmsg) { PyBufferProcs *pb = Py_TYPE(arg)->tp_as_buffer; Py_ssize_t count; Py_buffer view; *errmsg = NULL; *p = NULL; if (pb != NULL && pb->bf_releasebuffer != NULL) { *errmsg = "read-only bytes-like object"; return -1; } if (getbuffer(arg, &view, errmsg) < 0) return -1; count = view.len; *p = view.buf; PyBuffer_Release(&view); return count; } static int getbuffer(PyObject *arg, Py_buffer *view, const char **errmsg) { /* PyBUF_SIMPLE implies C-contiguous */ if (PyObject_GetBuffer(arg, view, PyBUF_SIMPLE) != 0) { *errmsg = "bytes-like object"; return -1; } assert(PyBuffer_IsContiguous(view, 'C')); return 0; } /* Support for keyword arguments donated by Geoff Philbrick */ /* Return false (0) for error, else true. */ int PyArg_ParseTupleAndKeywords(PyObject *args, PyObject *keywords, const char *format, const char * const *kwlist, ...) { int retval; va_list va; if ((args == NULL || !PyTuple_Check(args)) || (keywords != NULL && !PyDict_Check(keywords)) || format == NULL || kwlist == NULL) { PyErr_BadInternalCall(); return 0; } va_start(va, kwlist); retval = vgetargskeywords(args, keywords, format, kwlist, &va, 0); va_end(va); return retval; } int _PyArg_ParseTupleAndKeywords_SizeT(PyObject *args, PyObject *keywords, const char *format, const char * const *kwlist, ...) { int retval; va_list va; if ((args == NULL || !PyTuple_Check(args)) || (keywords != NULL && !PyDict_Check(keywords)) || format == NULL || kwlist == NULL) { PyErr_BadInternalCall(); return 0; } va_start(va, kwlist); retval = vgetargskeywords(args, keywords, format, kwlist, &va, 0); va_end(va); return retval; } int PyArg_VaParseTupleAndKeywords(PyObject *args, PyObject *keywords, const char *format, const char * const *kwlist, va_list va) { int retval; va_list lva; if ((args == NULL || !PyTuple_Check(args)) || (keywords != NULL && !PyDict_Check(keywords)) || format == NULL || kwlist == NULL) { PyErr_BadInternalCall(); return 0; } va_copy(lva, va); retval = vgetargskeywords(args, keywords, format, kwlist, &lva, 0); va_end(lva); return retval; } int _PyArg_VaParseTupleAndKeywords_SizeT(PyObject *args, PyObject *keywords, const char *format, const char * const *kwlist, va_list va) { int retval; va_list lva; if ((args == NULL || !PyTuple_Check(args)) || (keywords != NULL && !PyDict_Check(keywords)) || format == NULL || kwlist == NULL) { PyErr_BadInternalCall(); return 0; } va_copy(lva, va); retval = vgetargskeywords(args, keywords, format, kwlist, &lva, 0); va_end(lva); return retval; } PyAPI_FUNC(int) _PyArg_ParseTupleAndKeywordsFast(PyObject *args, PyObject *keywords, struct _PyArg_Parser *parser, ...) { int retval; va_list va; va_start(va, parser); retval = vgetargskeywordsfast(args, keywords, parser, &va, 0); va_end(va); return retval; } int _PyArg_ParseTupleAndKeywordsFast_SizeT(PyObject *args, PyObject *keywords, struct _PyArg_Parser *parser, ...) { int retval; va_list va; va_start(va, parser); retval = vgetargskeywordsfast(args, keywords, parser, &va, 0); va_end(va); return retval; } int _PyArg_ParseStackAndKeywords(PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames, struct _PyArg_Parser *parser, ...) { int retval; va_list va; va_start(va, parser); retval = vgetargskeywordsfast_impl(args, nargs, NULL, kwnames, parser, &va, 0); va_end(va); return retval; } int _PyArg_ParseStackAndKeywords_SizeT(PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames, struct _PyArg_Parser *parser, ...) { int retval; va_list va; va_start(va, parser); retval = vgetargskeywordsfast_impl(args, nargs, NULL, kwnames, parser, &va, 0); va_end(va); return retval; } static void error_unexpected_keyword_arg(PyObject *kwargs, PyObject *kwnames, PyObject *kwtuple, const char *fname) { /* make sure there are no extraneous keyword arguments */ Py_ssize_t j = 0; while (1) { PyObject *keyword; if (kwargs != NULL) { if (!PyDict_Next(kwargs, &j, &keyword, NULL)) break; } else { if (j >= PyTuple_GET_SIZE(kwnames)) break; keyword = PyTuple_GET_ITEM(kwnames, j); j++; } if (!PyUnicode_Check(keyword)) { PyErr_SetString(PyExc_TypeError, "keywords must be strings"); return; } int match = PySequence_Contains(kwtuple, keyword); if (match <= 0) { if (!match) { PyObject *kwlist = PySequence_List(kwtuple); if (!kwlist) { return; } PyObject *suggestion_keyword = _Py_CalculateSuggestions(kwlist, keyword); Py_DECREF(kwlist); if (suggestion_keyword) { PyErr_Format(PyExc_TypeError, "%.200s%s got an unexpected keyword argument '%S'." " Did you mean '%S'?", (fname == NULL) ? "this function" : fname, (fname == NULL) ? "" : "()", keyword, suggestion_keyword); Py_DECREF(suggestion_keyword); } else { PyErr_Format(PyExc_TypeError, "%.200s%s got an unexpected keyword argument '%S'", (fname == NULL) ? "this function" : fname, (fname == NULL) ? "" : "()", keyword); } } return; } } /* Something wrong happened. There are extraneous keyword arguments, * but we don't know what. And we don't bother. */ PyErr_Format(PyExc_TypeError, "invalid keyword argument for %.200s%s", (fname == NULL) ? "this function" : fname, (fname == NULL) ? "" : "()"); } int PyArg_ValidateKeywordArguments(PyObject *kwargs) { if (!PyDict_Check(kwargs)) { PyErr_BadInternalCall(); return 0; } if (!_PyDict_HasOnlyStringKeys(kwargs)) { PyErr_SetString(PyExc_TypeError, "keywords must be strings"); return 0; } return 1; } static PyObject * new_kwtuple(const char * const *keywords, int total, int pos); #define IS_END_OF_FORMAT(c) (c == '\0' || c == ';' || c == ':') static int vgetargskeywords(PyObject *args, PyObject *kwargs, const char *format, const char * const *kwlist, va_list *p_va, int flags) { char msgbuf[512]; int levels[32]; const char *fname, *msg, *custom_msg; int min = INT_MAX; int max = INT_MAX; int i, pos, len; int skip = 0; Py_ssize_t nargs, nkwargs; freelistentry_t static_entries[STATIC_FREELIST_ENTRIES]; freelist_t freelist; freelist.entries = static_entries; freelist.first_available = 0; freelist.entries_malloced = 0; assert(args != NULL && PyTuple_Check(args)); assert(kwargs == NULL || PyDict_Check(kwargs)); assert(format != NULL); assert(kwlist != NULL); assert(p_va != NULL); /* grab the function name or custom error msg first (mutually exclusive) */ fname = strchr(format, ':'); if (fname) { fname++; custom_msg = NULL; } else { custom_msg = strchr(format,';'); if (custom_msg) custom_msg++; } /* scan kwlist and count the number of positional-only parameters */ for (pos = 0; kwlist[pos] && !*kwlist[pos]; pos++) { } /* scan kwlist and get greatest possible nbr of args */ for (len = pos; kwlist[len]; len++) { if (!*kwlist[len]) { PyErr_SetString(PyExc_SystemError, "Empty keyword parameter name"); return cleanreturn(0, &freelist); } } if (len > STATIC_FREELIST_ENTRIES) { freelist.entries = PyMem_NEW(freelistentry_t, len); if (freelist.entries == NULL) { PyErr_NoMemory(); return 0; } freelist.entries_malloced = 1; } nargs = PyTuple_GET_SIZE(args); nkwargs = (kwargs == NULL) ? 0 : PyDict_GET_SIZE(kwargs); if (nargs + nkwargs > len) { /* Adding "keyword" (when nargs == 0) prevents producing wrong error messages in some special cases (see bpo-31229). */ PyErr_Format(PyExc_TypeError, "%.200s%s takes at most %d %sargument%s (%zd given)", (fname == NULL) ? "function" : fname, (fname == NULL) ? "" : "()", len, (nargs == 0) ? "keyword " : "", (len == 1) ? "" : "s", nargs + nkwargs); return cleanreturn(0, &freelist); } /* convert tuple args and keyword args in same loop, using kwlist to drive process */ for (i = 0; i < len; i++) { if (*format == '|') { if (min != INT_MAX) { PyErr_SetString(PyExc_SystemError, "Invalid format string (| specified twice)"); return cleanreturn(0, &freelist); } min = i; format++; if (max != INT_MAX) { PyErr_SetString(PyExc_SystemError, "Invalid format string ($ before |)"); return cleanreturn(0, &freelist); } } if (*format == '$') { if (max != INT_MAX) { PyErr_SetString(PyExc_SystemError, "Invalid format string ($ specified twice)"); return cleanreturn(0, &freelist); } max = i; format++; if (max < pos) { PyErr_SetString(PyExc_SystemError, "Empty parameter name after $"); return cleanreturn(0, &freelist); } if (skip) { /* Now we know the minimal and the maximal numbers of * positional arguments and can raise an exception with * informative message (see below). */ break; } if (max < nargs) { if (max == 0) { PyErr_Format(PyExc_TypeError, "%.200s%s takes no positional arguments", (fname == NULL) ? "function" : fname, (fname == NULL) ? "" : "()"); } else { PyErr_Format(PyExc_TypeError, "%.200s%s takes %s %d positional argument%s" " (%zd given)", (fname == NULL) ? "function" : fname, (fname == NULL) ? "" : "()", (min != INT_MAX) ? "at most" : "exactly", max, max == 1 ? "" : "s", nargs); } return cleanreturn(0, &freelist); } } if (IS_END_OF_FORMAT(*format)) { PyErr_Format(PyExc_SystemError, "More keyword list entries (%d) than " "format specifiers (%d)", len, i); return cleanreturn(0, &freelist); } if (!skip) { PyObject *current_arg; if (i < nargs) { current_arg = Py_NewRef(PyTuple_GET_ITEM(args, i)); } else if (nkwargs && i >= pos) { if (PyDict_GetItemStringRef(kwargs, kwlist[i], ¤t_arg) < 0) { return cleanreturn(0, &freelist); } if (current_arg) { --nkwargs; } } else { current_arg = NULL; } if (current_arg) { msg = convertitem(current_arg, &format, p_va, flags, levels, msgbuf, sizeof(msgbuf), &freelist); Py_DECREF(current_arg); if (msg) { seterror(i+1, msg, levels, fname, custom_msg); return cleanreturn(0, &freelist); } continue; } if (i < min) { if (i < pos) { assert (min == INT_MAX); assert (max == INT_MAX); skip = 1; /* At that moment we still don't know the minimal and * the maximal numbers of positional arguments. Raising * an exception is deferred until we encounter | and $ * or the end of the format. */ } else { PyErr_Format(PyExc_TypeError, "%.200s%s missing required " "argument '%s' (pos %d)", (fname == NULL) ? "function" : fname, (fname == NULL) ? "" : "()", kwlist[i], i+1); return cleanreturn(0, &freelist); } } /* current code reports success when all required args * fulfilled and no keyword args left, with no further * validation. XXX Maybe skip this in debug build ? */ if (!nkwargs && !skip) { return cleanreturn(1, &freelist); } } /* We are into optional args, skip through to any remaining * keyword args */ msg = skipitem(&format, p_va, flags); if (msg) { PyErr_Format(PyExc_SystemError, "%s: '%s'", msg, format); return cleanreturn(0, &freelist); } } if (skip) { PyErr_Format(PyExc_TypeError, "%.200s%s takes %s %d positional argument%s" " (%zd given)", (fname == NULL) ? "function" : fname, (fname == NULL) ? "" : "()", (Py_MIN(pos, min) < i) ? "at least" : "exactly", Py_MIN(pos, min), Py_MIN(pos, min) == 1 ? "" : "s", nargs); return cleanreturn(0, &freelist); } if (!IS_END_OF_FORMAT(*format) && (*format != '|') && (*format != '$')) { PyErr_Format(PyExc_SystemError, "more argument specifiers than keyword list entries " "(remaining format:'%s')", format); return cleanreturn(0, &freelist); } if (nkwargs > 0) { PyObject *key; Py_ssize_t j; /* make sure there are no arguments given by name and position */ for (i = pos; i < nargs; i++) { PyObject *current_arg; if (PyDict_GetItemStringRef(kwargs, kwlist[i], ¤t_arg) < 0) { return cleanreturn(0, &freelist); } if (current_arg) { Py_DECREF(current_arg); /* arg present in tuple and in dict */ PyErr_Format(PyExc_TypeError, "argument for %.200s%s given by name ('%s') " "and position (%d)", (fname == NULL) ? "function" : fname, (fname == NULL) ? "" : "()", kwlist[i], i+1); return cleanreturn(0, &freelist); } } /* make sure there are no extraneous keyword arguments */ j = 0; while (PyDict_Next(kwargs, &j, &key, NULL)) { int match = 0; if (!PyUnicode_Check(key)) { PyErr_SetString(PyExc_TypeError, "keywords must be strings"); return cleanreturn(0, &freelist); } for (i = pos; i < len; i++) { if (PyUnicode_EqualToUTF8(key, kwlist[i])) { match = 1; break; } } if (!match) { PyObject *_pykwtuple = new_kwtuple(kwlist, len, pos); if (!_pykwtuple) { return cleanreturn(0, &freelist); } PyObject *pykwlist = PySequence_List(_pykwtuple); Py_DECREF(_pykwtuple); if (!pykwlist) { return cleanreturn(0, &freelist); } PyObject *suggestion_keyword = _Py_CalculateSuggestions(pykwlist, key); Py_DECREF(pykwlist); if (suggestion_keyword) { PyErr_Format(PyExc_TypeError, "%.200s%s got an unexpected keyword argument '%S'." " Did you mean '%S'?", (fname == NULL) ? "this function" : fname, (fname == NULL) ? "" : "()", key, suggestion_keyword); Py_DECREF(suggestion_keyword); } else { PyErr_Format(PyExc_TypeError, "%.200s%s got an unexpected keyword argument '%S'", (fname == NULL) ? "this function" : fname, (fname == NULL) ? "" : "()", key); } return cleanreturn(0, &freelist); } } /* Something wrong happened. There are extraneous keyword arguments, * but we don't know what. And we don't bother. */ PyErr_Format(PyExc_TypeError, "invalid keyword argument for %.200s%s", (fname == NULL) ? "this function" : fname, (fname == NULL) ? "" : "()"); return cleanreturn(0, &freelist); } return cleanreturn(1, &freelist); } static int scan_keywords(const char * const *keywords, int *ptotal, int *pposonly) { /* scan keywords and count the number of positional-only parameters */ int i; for (i = 0; keywords[i] && !*keywords[i]; i++) { } *pposonly = i; /* scan keywords and get greatest possible nbr of args */ for (; keywords[i]; i++) { if (!*keywords[i]) { PyErr_SetString(PyExc_SystemError, "Empty keyword parameter name"); return -1; } } *ptotal = i; return 0; } static int parse_format(const char *format, int total, int npos, const char **pfname, const char **pcustommsg, int *pmin, int *pmax) { /* grab the function name or custom error msg first (mutually exclusive) */ const char *custommsg; const char *fname = strchr(format, ':'); if (fname) { fname++; custommsg = NULL; } else { custommsg = strchr(format,';'); if (custommsg) { custommsg++; } } int min = INT_MAX; int max = INT_MAX; for (int i = 0; i < total; i++) { if (*format == '|') { if (min != INT_MAX) { PyErr_SetString(PyExc_SystemError, "Invalid format string (| specified twice)"); return -1; } if (max != INT_MAX) { PyErr_SetString(PyExc_SystemError, "Invalid format string ($ before |)"); return -1; } min = i; format++; } if (*format == '$') { if (max != INT_MAX) { PyErr_SetString(PyExc_SystemError, "Invalid format string ($ specified twice)"); return -1; } if (i < npos) { PyErr_SetString(PyExc_SystemError, "Empty parameter name after $"); return -1; } max = i; format++; } if (IS_END_OF_FORMAT(*format)) { PyErr_Format(PyExc_SystemError, "More keyword list entries (%d) than " "format specifiers (%d)", total, i); return -1; } const char *msg = skipitem(&format, NULL, 0); if (msg) { PyErr_Format(PyExc_SystemError, "%s: '%s'", msg, format); return -1; } } min = Py_MIN(min, total); max = Py_MIN(max, total); if (!IS_END_OF_FORMAT(*format) && (*format != '|') && (*format != '$')) { PyErr_Format(PyExc_SystemError, "more argument specifiers than keyword list entries " "(remaining format:'%s')", format); return -1; } *pfname = fname; *pcustommsg = custommsg; *pmin = min; *pmax = max; return 0; } static PyObject * new_kwtuple(const char * const *keywords, int total, int pos) { int nkw = total - pos; PyObject *kwtuple = PyTuple_New(nkw); if (kwtuple == NULL) { return NULL; } keywords += pos; for (int i = 0; i < nkw; i++) { PyObject *str = PyUnicode_FromString(keywords[i]); if (str == NULL) { Py_DECREF(kwtuple); return NULL; } PyInterpreterState *interp = _PyInterpreterState_GET(); _PyUnicode_InternImmortal(interp, &str); PyTuple_SET_ITEM(kwtuple, i, str); } return kwtuple; } static int _parser_init(void *arg) { struct _PyArg_Parser *parser = (struct _PyArg_Parser *)arg; const char * const *keywords = parser->keywords; assert(keywords != NULL); assert(parser->pos == 0 && (parser->format == NULL || parser->fname == NULL) && parser->custom_msg == NULL && parser->min == 0 && parser->max == 0); int len, pos; if (scan_keywords(keywords, &len, &pos) < 0) { return -1; } const char *fname, *custommsg = NULL; int min = 0, max = 0; if (parser->format) { assert(parser->fname == NULL); if (parse_format(parser->format, len, pos, &fname, &custommsg, &min, &max) < 0) { return -1; } } else { assert(parser->fname != NULL); fname = parser->fname; } int owned; PyObject *kwtuple = parser->kwtuple; if (kwtuple == NULL) { /* We may temporarily switch to the main interpreter to avoid * creating a tuple that could outlive its owning interpreter. */ PyThreadState *save_tstate = NULL; PyThreadState *temp_tstate = NULL; if (!_Py_IsMainInterpreter(PyInterpreterState_Get())) { temp_tstate = PyThreadState_New(_PyInterpreterState_Main()); if (temp_tstate == NULL) { return -1; } save_tstate = PyThreadState_Swap(temp_tstate); } kwtuple = new_kwtuple(keywords, len, pos); if (temp_tstate != NULL) { PyThreadState_Clear(temp_tstate); (void)PyThreadState_Swap(save_tstate); PyThreadState_Delete(temp_tstate); } if (kwtuple == NULL) { return -1; } owned = 1; } else { owned = 0; } parser->pos = pos; parser->fname = fname; parser->custom_msg = custommsg; parser->min = min; parser->max = max; parser->kwtuple = kwtuple; parser->is_kwtuple_owned = owned; assert(parser->next == NULL); parser->next = _Py_atomic_load_ptr(&_PyRuntime.getargs.static_parsers); do { // compare-exchange updates parser->next on failure } while (!_Py_atomic_compare_exchange_ptr(&_PyRuntime.getargs.static_parsers, &parser->next, parser)); return 0; } static int parser_init(struct _PyArg_Parser *parser) { return _PyOnceFlag_CallOnce(&parser->once, &_parser_init, parser); } static void parser_clear(struct _PyArg_Parser *parser) { if (parser->is_kwtuple_owned) { Py_CLEAR(parser->kwtuple); } } static PyObject* find_keyword(PyObject *kwnames, PyObject *const *kwstack, PyObject *key) { Py_ssize_t i, nkwargs; nkwargs = PyTuple_GET_SIZE(kwnames); for (i = 0; i < nkwargs; i++) { PyObject *kwname = PyTuple_GET_ITEM(kwnames, i); /* kwname == key will normally find a match in since keyword keys should be interned strings; if not retry below in a new loop. */ if (kwname == key) { return Py_NewRef(kwstack[i]); } } for (i = 0; i < nkwargs; i++) { PyObject *kwname = PyTuple_GET_ITEM(kwnames, i); assert(PyUnicode_Check(kwname)); if (_PyUnicode_EQ(kwname, key)) { return Py_NewRef(kwstack[i]); } } return NULL; } static int vgetargskeywordsfast_impl(PyObject *const *args, Py_ssize_t nargs, PyObject *kwargs, PyObject *kwnames, struct _PyArg_Parser *parser, va_list *p_va, int flags) { PyObject *kwtuple; char msgbuf[512]; int levels[32]; const char *format; const char *msg; PyObject *keyword; Py_ssize_t i; int pos, len; Py_ssize_t nkwargs; freelistentry_t static_entries[STATIC_FREELIST_ENTRIES]; freelist_t freelist; PyObject *const *kwstack = NULL; freelist.entries = static_entries; freelist.first_available = 0; freelist.entries_malloced = 0; assert(kwargs == NULL || PyDict_Check(kwargs)); assert(kwargs == NULL || kwnames == NULL); assert(p_va != NULL); if (parser == NULL) { PyErr_BadInternalCall(); return 0; } if (kwnames != NULL && !PyTuple_Check(kwnames)) { PyErr_BadInternalCall(); return 0; } if (parser_init(parser) < 0) { return 0; } kwtuple = parser->kwtuple; pos = parser->pos; len = pos + (int)PyTuple_GET_SIZE(kwtuple); if (len > STATIC_FREELIST_ENTRIES) { freelist.entries = PyMem_NEW(freelistentry_t, len); if (freelist.entries == NULL) { PyErr_NoMemory(); return 0; } freelist.entries_malloced = 1; } if (kwargs != NULL) { nkwargs = PyDict_GET_SIZE(kwargs); } else if (kwnames != NULL) { nkwargs = PyTuple_GET_SIZE(kwnames); kwstack = args + nargs; } else { nkwargs = 0; } if (nargs + nkwargs > len) { /* Adding "keyword" (when nargs == 0) prevents producing wrong error messages in some special cases (see bpo-31229). */ PyErr_Format(PyExc_TypeError, "%.200s%s takes at most %d %sargument%s (%zd given)", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()", len, (nargs == 0) ? "keyword " : "", (len == 1) ? "" : "s", nargs + nkwargs); return cleanreturn(0, &freelist); } if (parser->max < nargs) { if (parser->max == 0) { PyErr_Format(PyExc_TypeError, "%.200s%s takes no positional arguments", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()"); } else { PyErr_Format(PyExc_TypeError, "%.200s%s takes %s %d positional argument%s (%zd given)", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()", (parser->min < parser->max) ? "at most" : "exactly", parser->max, parser->max == 1 ? "" : "s", nargs); } return cleanreturn(0, &freelist); } format = parser->format; assert(format != NULL || len == 0); /* convert tuple args and keyword args in same loop, using kwtuple to drive process */ for (i = 0; i < len; i++) { if (*format == '|') { format++; } if (*format == '$') { format++; } assert(!IS_END_OF_FORMAT(*format)); PyObject *current_arg; if (i < nargs) { current_arg = Py_NewRef(args[i]); } else if (nkwargs && i >= pos) { keyword = PyTuple_GET_ITEM(kwtuple, i - pos); if (kwargs != NULL) { if (PyDict_GetItemRef(kwargs, keyword, ¤t_arg) < 0) { return cleanreturn(0, &freelist); } } else { current_arg = find_keyword(kwnames, kwstack, keyword); } if (current_arg) { --nkwargs; } } else { current_arg = NULL; } if (current_arg) { msg = convertitem(current_arg, &format, p_va, flags, levels, msgbuf, sizeof(msgbuf), &freelist); Py_DECREF(current_arg); if (msg) { seterror(i+1, msg, levels, parser->fname, parser->custom_msg); return cleanreturn(0, &freelist); } continue; } if (i < parser->min) { /* Less arguments than required */ if (i < pos) { Py_ssize_t min = Py_MIN(pos, parser->min); PyErr_Format(PyExc_TypeError, "%.200s%s takes %s %d positional argument%s" " (%zd given)", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()", min < parser->max ? "at least" : "exactly", min, min == 1 ? "" : "s", nargs); } else { keyword = PyTuple_GET_ITEM(kwtuple, i - pos); PyErr_Format(PyExc_TypeError, "%.200s%s missing required " "argument '%U' (pos %d)", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()", keyword, i+1); } return cleanreturn(0, &freelist); } /* current code reports success when all required args * fulfilled and no keyword args left, with no further * validation. XXX Maybe skip this in debug build ? */ if (!nkwargs) { return cleanreturn(1, &freelist); } /* We are into optional args, skip through to any remaining * keyword args */ msg = skipitem(&format, p_va, flags); assert(msg == NULL); } assert(IS_END_OF_FORMAT(*format) || (*format == '|') || (*format == '$')); if (nkwargs > 0) { /* make sure there are no arguments given by name and position */ for (i = pos; i < nargs; i++) { PyObject *current_arg; keyword = PyTuple_GET_ITEM(kwtuple, i - pos); if (kwargs != NULL) { if (PyDict_GetItemRef(kwargs, keyword, ¤t_arg) < 0) { return cleanreturn(0, &freelist); } } else { current_arg = find_keyword(kwnames, kwstack, keyword); } if (current_arg) { Py_DECREF(current_arg); /* arg present in tuple and in dict */ PyErr_Format(PyExc_TypeError, "argument for %.200s%s given by name ('%U') " "and position (%d)", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()", keyword, i+1); return cleanreturn(0, &freelist); } } error_unexpected_keyword_arg(kwargs, kwnames, kwtuple, parser->fname); return cleanreturn(0, &freelist); } return cleanreturn(1, &freelist); } static int vgetargskeywordsfast(PyObject *args, PyObject *keywords, struct _PyArg_Parser *parser, va_list *p_va, int flags) { PyObject **stack; Py_ssize_t nargs; if (args == NULL || !PyTuple_Check(args) || (keywords != NULL && !PyDict_Check(keywords))) { PyErr_BadInternalCall(); return 0; } stack = _PyTuple_ITEMS(args); nargs = PyTuple_GET_SIZE(args); return vgetargskeywordsfast_impl(stack, nargs, keywords, NULL, parser, p_va, flags); } #undef _PyArg_UnpackKeywords PyObject * const * _PyArg_UnpackKeywords(PyObject *const *args, Py_ssize_t nargs, PyObject *kwargs, PyObject *kwnames, struct _PyArg_Parser *parser, int minpos, int maxpos, int minkw, PyObject **buf) { PyObject *kwtuple; PyObject *keyword; int i, posonly, minposonly, maxargs; int reqlimit = minkw ? maxpos + minkw : minpos; Py_ssize_t nkwargs; PyObject * const *kwstack = NULL; assert(kwargs == NULL || PyDict_Check(kwargs)); assert(kwargs == NULL || kwnames == NULL); if (parser == NULL) { PyErr_BadInternalCall(); return NULL; } if (kwnames != NULL && !PyTuple_Check(kwnames)) { PyErr_BadInternalCall(); return NULL; } if (args == NULL && nargs == 0) { args = buf; } if (parser_init(parser) < 0) { return NULL; } kwtuple = parser->kwtuple; posonly = parser->pos; minposonly = Py_MIN(posonly, minpos); maxargs = posonly + (int)PyTuple_GET_SIZE(kwtuple); if (kwargs != NULL) { nkwargs = PyDict_GET_SIZE(kwargs); } else if (kwnames != NULL) { nkwargs = PyTuple_GET_SIZE(kwnames); kwstack = args + nargs; } else { nkwargs = 0; } if (nkwargs == 0 && minkw == 0 && minpos <= nargs && nargs <= maxpos) { /* Fast path. */ return args; } if (nargs + nkwargs > maxargs) { /* Adding "keyword" (when nargs == 0) prevents producing wrong error messages in some special cases (see bpo-31229). */ PyErr_Format(PyExc_TypeError, "%.200s%s takes at most %d %sargument%s (%zd given)", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()", maxargs, (nargs == 0) ? "keyword " : "", (maxargs == 1) ? "" : "s", nargs + nkwargs); return NULL; } if (nargs > maxpos) { if (maxpos == 0) { PyErr_Format(PyExc_TypeError, "%.200s%s takes no positional arguments", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()"); } else { PyErr_Format(PyExc_TypeError, "%.200s%s takes %s %d positional argument%s (%zd given)", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()", (minpos < maxpos) ? "at most" : "exactly", maxpos, (maxpos == 1) ? "" : "s", nargs); } return NULL; } if (nargs < minposonly) { PyErr_Format(PyExc_TypeError, "%.200s%s takes %s %d positional argument%s" " (%zd given)", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()", minposonly < maxpos ? "at least" : "exactly", minposonly, minposonly == 1 ? "" : "s", nargs); return NULL; } /* copy tuple args */ for (i = 0; i < nargs; i++) { buf[i] = args[i]; } /* copy keyword args using kwtuple to drive process */ for (i = Py_MAX((int)nargs, posonly); i < maxargs; i++) { PyObject *current_arg; if (nkwargs) { keyword = PyTuple_GET_ITEM(kwtuple, i - posonly); if (kwargs != NULL) { if (PyDict_GetItemRef(kwargs, keyword, ¤t_arg) < 0) { return NULL; } } else { current_arg = find_keyword(kwnames, kwstack, keyword); } } else if (i >= reqlimit) { break; } else { current_arg = NULL; } buf[i] = current_arg; if (current_arg) { Py_DECREF(current_arg); --nkwargs; } else if (i < minpos || (maxpos <= i && i < reqlimit)) { /* Less arguments than required */ keyword = PyTuple_GET_ITEM(kwtuple, i - posonly); PyErr_Format(PyExc_TypeError, "%.200s%s missing required " "argument '%U' (pos %d)", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()", keyword, i+1); return NULL; } } if (nkwargs > 0) { /* make sure there are no arguments given by name and position */ for (i = posonly; i < nargs; i++) { PyObject *current_arg; keyword = PyTuple_GET_ITEM(kwtuple, i - posonly); if (kwargs != NULL) { if (PyDict_GetItemRef(kwargs, keyword, ¤t_arg) < 0) { return NULL; } } else { current_arg = find_keyword(kwnames, kwstack, keyword); } if (current_arg) { Py_DECREF(current_arg); /* arg present in tuple and in dict */ PyErr_Format(PyExc_TypeError, "argument for %.200s%s given by name ('%U') " "and position (%d)", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()", keyword, i+1); return NULL; } } error_unexpected_keyword_arg(kwargs, kwnames, kwtuple, parser->fname); return NULL; } return buf; } PyObject * const * _PyArg_UnpackKeywordsWithVararg(PyObject *const *args, Py_ssize_t nargs, PyObject *kwargs, PyObject *kwnames, struct _PyArg_Parser *parser, int minpos, int maxpos, int minkw, int vararg, PyObject **buf) { PyObject *kwtuple; PyObject *keyword; Py_ssize_t varargssize = 0; int i, posonly, minposonly, maxargs; int reqlimit = minkw ? maxpos + minkw : minpos; Py_ssize_t nkwargs; PyObject * const *kwstack = NULL; assert(kwargs == NULL || PyDict_Check(kwargs)); assert(kwargs == NULL || kwnames == NULL); if (parser == NULL) { PyErr_BadInternalCall(); return NULL; } if (kwnames != NULL && !PyTuple_Check(kwnames)) { PyErr_BadInternalCall(); return NULL; } if (args == NULL && nargs == 0) { args = buf; } if (parser_init(parser) < 0) { return NULL; } kwtuple = parser->kwtuple; posonly = parser->pos; minposonly = Py_MIN(posonly, minpos); maxargs = posonly + (int)PyTuple_GET_SIZE(kwtuple); if (kwargs != NULL) { nkwargs = PyDict_GET_SIZE(kwargs); } else if (kwnames != NULL) { nkwargs = PyTuple_GET_SIZE(kwnames); kwstack = args + nargs; } else { nkwargs = 0; } if (nargs < minposonly) { PyErr_Format(PyExc_TypeError, "%.200s%s takes %s %d positional argument%s" " (%zd given)", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()", minposonly < maxpos ? "at least" : "exactly", minposonly, minposonly == 1 ? "" : "s", nargs); return NULL; } /* create varargs tuple */ varargssize = nargs - maxpos; if (varargssize < 0) { varargssize = 0; } buf[vararg] = PyTuple_New(varargssize); if (!buf[vararg]) { return NULL; } /* copy tuple args */ for (i = 0; i < nargs; i++) { if (i >= vararg) { PyTuple_SET_ITEM(buf[vararg], i - vararg, Py_NewRef(args[i])); continue; } else { buf[i] = args[i]; } } /* copy keyword args using kwtuple to drive process */ for (i = Py_MAX((int)nargs, posonly) - Py_SAFE_DOWNCAST(varargssize, Py_ssize_t, int); i < maxargs; i++) { PyObject *current_arg; if (nkwargs) { keyword = PyTuple_GET_ITEM(kwtuple, i - posonly); if (kwargs != NULL) { if (PyDict_GetItemRef(kwargs, keyword, ¤t_arg) < 0) { goto exit; } } else { current_arg = find_keyword(kwnames, kwstack, keyword); } } else { current_arg = NULL; } /* If an arguments is passed in as a keyword argument, * it should be placed before `buf[vararg]`. * * For example: * def f(a, /, b, *args): * pass * f(1, b=2) * * This `buf` array should be: [1, 2, NULL]. * In this case, nargs < vararg. * * Otherwise, we leave a place at `buf[vararg]` for vararg tuple * so the index is `i + 1`. */ if (nargs < vararg && i != vararg) { buf[i] = current_arg; } else { buf[i + 1] = current_arg; } if (current_arg) { Py_DECREF(current_arg); --nkwargs; } else if (i < minpos || (maxpos <= i && i < reqlimit)) { /* Less arguments than required */ keyword = PyTuple_GET_ITEM(kwtuple, i - posonly); PyErr_Format(PyExc_TypeError, "%.200s%s missing required " "argument '%U' (pos %d)", (parser->fname == NULL) ? "function" : parser->fname, (parser->fname == NULL) ? "" : "()", keyword, i+1); goto exit; } } if (nkwargs > 0) { error_unexpected_keyword_arg(kwargs, kwnames, kwtuple, parser->fname); goto exit; } return buf; exit: Py_XDECREF(buf[vararg]); return NULL; } static const char * skipitem(const char **p_format, va_list *p_va, int flags) { const char *format = *p_format; char c = *format++; switch (c) { /* * codes that take a single data pointer as an argument * (the type of the pointer is irrelevant) */ case 'b': /* byte -- very short int */ case 'B': /* byte as bitfield */ case 'h': /* short int */ case 'H': /* short int as bitfield */ case 'i': /* int */ case 'I': /* int sized bitfield */ case 'l': /* long int */ case 'k': /* long int sized bitfield */ case 'L': /* long long */ case 'K': /* long long sized bitfield */ case 'n': /* Py_ssize_t */ case 'f': /* float */ case 'd': /* double */ case 'D': /* complex double */ case 'c': /* char */ case 'C': /* unicode char */ case 'p': /* boolean predicate */ case 'S': /* string object */ case 'Y': /* string object */ case 'U': /* unicode string object */ { if (p_va != NULL) { (void) va_arg(*p_va, void *); } break; } /* string codes */ case 'e': /* string with encoding */ { if (p_va != NULL) { (void) va_arg(*p_va, const char *); } if (!(*format == 's' || *format == 't')) /* after 'e', only 's' and 't' is allowed */ goto err; format++; } _Py_FALLTHROUGH; case 's': /* string */ case 'z': /* string or None */ case 'y': /* bytes */ case 'w': /* buffer, read-write */ { if (p_va != NULL) { (void) va_arg(*p_va, char **); } if (c == 'w' && *format != '*') { /* after 'w', only '*' is allowed */ goto err; } if (*format == '#') { if (p_va != NULL) { (void) va_arg(*p_va, Py_ssize_t *); } format++; } else if ((c == 's' || c == 'z' || c == 'y' || c == 'w') && *format == '*') { format++; } break; } case 'O': /* object */ { if (*format == '!') { format++; if (p_va != NULL) { (void) va_arg(*p_va, PyTypeObject*); (void) va_arg(*p_va, PyObject **); } } else if (*format == '&') { typedef int (*converter)(PyObject *, void *); if (p_va != NULL) { (void) va_arg(*p_va, converter); (void) va_arg(*p_va, void *); } format++; } else { if (p_va != NULL) { (void) va_arg(*p_va, PyObject **); } } break; } case '(': /* bypass tuple, not handled at all previously */ { const char *msg; for (;;) { if (*format==')') break; if (IS_END_OF_FORMAT(*format)) return "Unmatched left paren in format " "string"; msg = skipitem(&format, p_va, flags); if (msg) return msg; } format++; break; } case ')': return "Unmatched right paren in format string"; default: err: return "impossible"; } *p_format = format; return NULL; } #undef _PyArg_CheckPositional int _PyArg_CheckPositional(const char *name, Py_ssize_t nargs, Py_ssize_t min, Py_ssize_t max) { assert(min >= 0); assert(min <= max); if (nargs < min) { if (name != NULL) PyErr_Format( PyExc_TypeError, "%.200s expected %s%zd argument%s, got %zd", name, (min == max ? "" : "at least "), min, min == 1 ? "" : "s", nargs); else PyErr_Format( PyExc_TypeError, "unpacked tuple should have %s%zd element%s," " but has %zd", (min == max ? "" : "at least "), min, min == 1 ? "" : "s", nargs); return 0; } if (nargs == 0) { return 1; } if (nargs > max) { if (name != NULL) PyErr_Format( PyExc_TypeError, "%.200s expected %s%zd argument%s, got %zd", name, (min == max ? "" : "at most "), max, max == 1 ? "" : "s", nargs); else PyErr_Format( PyExc_TypeError, "unpacked tuple should have %s%zd element%s," " but has %zd", (min == max ? "" : "at most "), max, max == 1 ? "" : "s", nargs); return 0; } return 1; } static int unpack_stack(PyObject *const *args, Py_ssize_t nargs, const char *name, Py_ssize_t min, Py_ssize_t max, va_list vargs) { Py_ssize_t i; PyObject **o; if (!_PyArg_CheckPositional(name, nargs, min, max)) { return 0; } for (i = 0; i < nargs; i++) { o = va_arg(vargs, PyObject **); *o = args[i]; } return 1; } int PyArg_UnpackTuple(PyObject *args, const char *name, Py_ssize_t min, Py_ssize_t max, ...) { PyObject **stack; Py_ssize_t nargs; int retval; va_list vargs; if (!PyTuple_Check(args)) { PyErr_SetString(PyExc_SystemError, "PyArg_UnpackTuple() argument list is not a tuple"); return 0; } stack = _PyTuple_ITEMS(args); nargs = PyTuple_GET_SIZE(args); va_start(vargs, max); retval = unpack_stack(stack, nargs, name, min, max, vargs); va_end(vargs); return retval; } int _PyArg_UnpackStack(PyObject *const *args, Py_ssize_t nargs, const char *name, Py_ssize_t min, Py_ssize_t max, ...) { int retval; va_list vargs; va_start(vargs, max); retval = unpack_stack(args, nargs, name, min, max, vargs); va_end(vargs); return retval; } #undef _PyArg_NoKeywords #undef _PyArg_NoKwnames #undef _PyArg_NoPositional /* For type constructors that don't take keyword args * * Sets a TypeError and returns 0 if the args/kwargs is * not empty, returns 1 otherwise */ int _PyArg_NoKeywords(const char *funcname, PyObject *kwargs) { if (kwargs == NULL) { return 1; } if (!PyDict_CheckExact(kwargs)) { PyErr_BadInternalCall(); return 0; } if (PyDict_GET_SIZE(kwargs) == 0) { return 1; } PyErr_Format(PyExc_TypeError, "%.200s() takes no keyword arguments", funcname); return 0; } int _PyArg_NoPositional(const char *funcname, PyObject *args) { if (args == NULL) return 1; if (!PyTuple_CheckExact(args)) { PyErr_BadInternalCall(); return 0; } if (PyTuple_GET_SIZE(args) == 0) return 1; PyErr_Format(PyExc_TypeError, "%.200s() takes no positional arguments", funcname); return 0; } int _PyArg_NoKwnames(const char *funcname, PyObject *kwnames) { if (kwnames == NULL) { return 1; } assert(PyTuple_CheckExact(kwnames)); if (PyTuple_GET_SIZE(kwnames) == 0) { return 1; } PyErr_Format(PyExc_TypeError, "%s() takes no keyword arguments", funcname); return 0; } void _PyArg_Fini(void) { struct _PyArg_Parser *tmp, *s = _PyRuntime.getargs.static_parsers; while (s) { tmp = s->next; s->next = NULL; parser_clear(s); s = tmp; } _PyRuntime.getargs.static_parsers = NULL; }