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Add const to several API functions that take char *.
In C++, it's an error to pass a string literal to a char* function without a const_cast(). Rather than require every C++ extension module to put a cast around string literals, fix the API to state the const-ness. I focused on parts of the API where people usually pass literals: PyArg_ParseTuple() and friends, Py_BuildValue(), PyMethodDef, the type slots, etc. Predictably, there were a large set of functions that needed to be fixed as a result of these changes. The most pervasive change was to make the keyword args list passed to PyArg_ParseTupleAndKewords() to be a const char *kwlist[]. One cast was required as a result of the changes: A type object mallocs the memory for its tp_doc slot and later frees it. PyTypeObject says that tp_doc is const char *; but if the type was created by type_new(), we know it is safe to cast to char *.
This commit is contained in:
Jeremy Hylton
parent
aaa2f1dea7
commit
af68c874a6
52 changed files with 272 additions and 255 deletions
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@ -6,33 +6,33 @@
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#include <ctype.h>
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int PyArg_Parse(PyObject *, char *, ...);
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int PyArg_ParseTuple(PyObject *, char *, ...);
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int PyArg_VaParse(PyObject *, char *, va_list);
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int PyArg_Parse(PyObject *, const char *, ...);
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int PyArg_ParseTuple(PyObject *, const char *, ...);
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int PyArg_VaParse(PyObject *, const char *, va_list);
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int PyArg_ParseTupleAndKeywords(PyObject *, PyObject *,
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char *, char **, ...);
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const char *, const char **, ...);
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int PyArg_VaParseTupleAndKeywords(PyObject *, PyObject *,
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char *, char **, va_list);
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const char *, const char **, va_list);
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/* Forward */
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static int vgetargs1(PyObject *, char *, va_list *, int);
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static void seterror(int, char *, int *, char *, char *);
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static char *convertitem(PyObject *, char **, va_list *, int *, char *,
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static int vgetargs1(PyObject *, const char *, va_list *, int);
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static void seterror(int, const char *, int *, const char *, const char *);
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static char *convertitem(PyObject *, const char **, va_list *, int *, char *,
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size_t, PyObject **);
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static char *converttuple(PyObject *, char **, va_list *,
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static char *converttuple(PyObject *, const char **, va_list *,
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int *, char *, size_t, int, PyObject **);
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static char *convertsimple(PyObject *, char **, va_list *, char *,
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static char *convertsimple(PyObject *, const char **, va_list *, char *,
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size_t, PyObject **);
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static int convertbuffer(PyObject *, void **p, char **);
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static int vgetargskeywords(PyObject *, PyObject *,
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char *, char **, va_list *);
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static char *skipitem(char **, va_list *);
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const char *, const char **, va_list *);
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static char *skipitem(const char **, va_list *);
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int
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PyArg_Parse(PyObject *args, char *format, ...)
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PyArg_Parse(PyObject *args, const char *format, ...)
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{
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int retval;
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va_list va;
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@ -45,7 +45,7 @@ PyArg_Parse(PyObject *args, char *format, ...)
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int
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PyArg_ParseTuple(PyObject *args, char *format, ...)
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PyArg_ParseTuple(PyObject *args, const char *format, ...)
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{
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int retval;
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va_list va;
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@ -58,7 +58,7 @@ PyArg_ParseTuple(PyObject *args, char *format, ...)
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int
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PyArg_VaParse(PyObject *args, char *format, va_list va)
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PyArg_VaParse(PyObject *args, const char *format, va_list va)
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{
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va_list lva;
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@ -120,17 +120,17 @@ cleanreturn(int retval, PyObject *freelist)
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static int
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vgetargs1(PyObject *args, char *format, va_list *p_va, int compat)
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vgetargs1(PyObject *args, const char *format, va_list *p_va, int compat)
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{
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char msgbuf[256];
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int levels[32];
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char *fname = NULL;
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char *message = NULL;
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const char *fname = NULL;
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const char *message = NULL;
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int min = -1;
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int max = 0;
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int level = 0;
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int endfmt = 0;
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char *formatsave = format;
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const char *formatsave = format;
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int i, len;
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char *msg;
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PyObject *freelist = NULL;
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@ -269,7 +269,8 @@ vgetargs1(PyObject *args, char *format, va_list *p_va, int compat)
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static void
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seterror(int iarg, char *msg, int *levels, char *fname, char *message)
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seterror(int iarg, const char *msg, int *levels, const char *fname,
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const char *message)
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{
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char buf[512];
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int i;
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@ -324,12 +325,12 @@ seterror(int iarg, char *msg, int *levels, char *fname, char *message)
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*/
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static char *
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converttuple(PyObject *arg, char **p_format, va_list *p_va, int *levels,
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converttuple(PyObject *arg, const char **p_format, va_list *p_va, int *levels,
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char *msgbuf, size_t bufsize, int toplevel, PyObject **freelist)
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{
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int level = 0;
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int n = 0;
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char *format = *p_format;
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const char *format = *p_format;
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int i;
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for (;;) {
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@ -392,11 +393,11 @@ converttuple(PyObject *arg, char **p_format, va_list *p_va, int *levels,
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/* Convert a single item. */
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static char *
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convertitem(PyObject *arg, char **p_format, va_list *p_va, int *levels,
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convertitem(PyObject *arg, const char **p_format, va_list *p_va, int *levels,
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char *msgbuf, size_t bufsize, PyObject **freelist)
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{
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char *msg;
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char *format = *p_format;
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const char *format = *p_format;
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if (*format == '(' /* ')' */) {
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format++;
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@ -424,7 +425,7 @@ convertitem(PyObject *arg, char **p_format, va_list *p_va, int *levels,
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/* Format an error message generated by convertsimple(). */
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static char *
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converterr(char *expected, PyObject *arg, char *msgbuf, size_t bufsize)
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converterr(const char *expected, PyObject *arg, char *msgbuf, size_t bufsize)
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{
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assert(expected != NULL);
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assert(arg != NULL);
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@ -459,10 +460,10 @@ float_argument_error(PyObject *arg)
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*/
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static char *
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convertsimple(PyObject *arg, char **p_format, va_list *p_va, char *msgbuf,
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size_t bufsize, PyObject **freelist)
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convertsimple(PyObject *arg, const char **p_format, va_list *p_va,
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char *msgbuf, size_t bufsize, PyObject **freelist)
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{
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char *format = *p_format;
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const char *format = *p_format;
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char c = *format++;
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#ifdef Py_USING_UNICODE
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PyObject *uarg;
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@ -1134,8 +1135,8 @@ convertbuffer(PyObject *arg, void **p, char **errmsg)
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int
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PyArg_ParseTupleAndKeywords(PyObject *args,
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PyObject *keywords,
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char *format,
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char **kwlist, ...)
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const char *format,
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const char **kwlist, ...)
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{
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int retval;
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va_list va;
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@ -1158,9 +1159,9 @@ PyArg_ParseTupleAndKeywords(PyObject *args,
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int
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PyArg_VaParseTupleAndKeywords(PyObject *args,
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PyObject *keywords,
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char *format,
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char **kwlist, va_list va)
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PyObject *keywords,
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const char *format,
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const char **kwlist, va_list va)
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{
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int retval;
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va_list lva;
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@ -1190,16 +1191,16 @@ PyArg_VaParseTupleAndKeywords(PyObject *args,
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static int
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vgetargskeywords(PyObject *args, PyObject *keywords, char *format,
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char **kwlist, va_list *p_va)
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vgetargskeywords(PyObject *args, PyObject *keywords, const char *format,
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const char **kwlist, va_list *p_va)
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{
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char msgbuf[512];
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int levels[32];
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char *fname, *message;
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const char *fname, *message;
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int min, max;
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char *formatsave;
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const char *formatsave;
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int i, len, nargs, nkeywords;
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char *msg, **p;
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const char *msg, **p;
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PyObject *freelist = NULL;
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assert(args != NULL && PyTuple_Check(args));
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@ -1269,7 +1270,7 @@ vgetargskeywords(PyObject *args, PyObject *keywords, char *format,
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keyword parameter in messages */
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if (nkeywords > 0) {
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for (i = 0; i < nargs; i++) {
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char *thiskw = kwlist[i];
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const char *thiskw = kwlist[i];
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if (thiskw == NULL)
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break;
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if (PyDict_GetItemString(keywords, thiskw)) {
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@ -1402,9 +1403,9 @@ vgetargskeywords(PyObject *args, PyObject *keywords, char *format,
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static char *
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skipitem(char **p_format, va_list *p_va)
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skipitem(const char **p_format, va_list *p_va)
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{
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char *format = *p_format;
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const char *format = *p_format;
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char c = *format++;
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switch (c) {
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@ -1518,7 +1519,7 @@ err:
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int
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PyArg_UnpackTuple(PyObject *args, char *name, int min, int max, ...)
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PyArg_UnpackTuple(PyObject *args, const char *name, int min, int max, ...)
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{
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int i, l;
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PyObject **o;
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@ -1583,7 +1584,7 @@ PyArg_UnpackTuple(PyObject *args, char *name, int min, int max, ...)
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* not emtpy, returns 1 otherwise
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*/
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int
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_PyArg_NoKeywords(char *funcname, PyObject *kw)
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_PyArg_NoKeywords(const char *funcname, PyObject *kw)
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{
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if (kw == NULL)
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return 1;
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@ -1598,6 +1599,3 @@ _PyArg_NoKeywords(char *funcname, PyObject *kw)
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funcname);
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return 0;
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}
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