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faad5ad590
use wrappers on all platforms, to make this as consistent as possible x- platform (in particular, make sure there's at least one \0 byte in the output buffer). Also document more of the truth about what these do. getargs.c, seterror(): Three computations of remaining buffer size were backwards, thus telling PyOS_snprintf the buffer is larger than it actually is. This matters a lot now that PyOS_snprintf ensures there's a trailing \0 byte (because it didn't get the truth about the buffer size, it was storing \0 beyond the true end of the buffer). sysmodule.c, mywrite(): Simplify, now that PyOS_vsnprintf guarantees to produce a \0 byte.
1432 lines
33 KiB
C
1432 lines
33 KiB
C
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/* New getargs implementation */
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#include "Python.h"
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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_ParseTupleAndKeywords(PyObject *, PyObject *,
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char *, char **, ...);
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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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size_t);
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static char *converttuple(PyObject *, char **, va_list *,
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int *, char *, size_t, int);
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static char *convertsimple(PyObject *, char **, va_list *, char *, size_t);
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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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int
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PyArg_Parse(PyObject *args, char *format, ...)
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{
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int retval;
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va_list va;
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va_start(va, format);
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retval = vgetargs1(args, format, &va, 1);
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va_end(va);
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return retval;
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}
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int
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PyArg_ParseTuple(PyObject *args, char *format, ...)
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{
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int retval;
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va_list va;
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va_start(va, format);
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retval = vgetargs1(args, format, &va, 0);
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va_end(va);
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return retval;
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}
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int
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PyArg_VaParse(PyObject *args, char *format, va_list va)
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{
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va_list lva;
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#ifdef VA_LIST_IS_ARRAY
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memcpy(lva, va, sizeof(va_list));
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#else
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lva = va;
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#endif
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return vgetargs1(args, format, &lva, 0);
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}
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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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{
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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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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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int i, len;
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char *msg;
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assert(compat || (args != (PyObject*)NULL));
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while (endfmt == 0) {
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int c = *format++;
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switch (c) {
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case '(':
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if (level == 0)
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max++;
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level++;
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break;
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case ')':
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if (level == 0)
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Py_FatalError("excess ')' in getargs format");
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else
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level--;
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break;
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case '\0':
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endfmt = 1;
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break;
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case ':':
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fname = format;
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endfmt = 1;
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break;
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case ';':
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message = format;
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endfmt = 1;
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break;
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default:
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if (level == 0) {
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if (c == 'O')
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max++;
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else if (isalpha(c)) {
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if (c != 'e') /* skip encoded */
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max++;
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} else if (c == '|')
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min = max;
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}
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break;
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}
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}
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if (level != 0)
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Py_FatalError(/* '(' */ "missing ')' in getargs format");
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if (min < 0)
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min = max;
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format = formatsave;
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if (compat) {
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if (max == 0) {
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if (args == NULL)
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return 1;
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PyOS_snprintf(msgbuf, sizeof(msgbuf),
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"%.200s%s takes no arguments",
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fname==NULL ? "function" : fname,
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fname==NULL ? "" : "()");
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PyErr_SetString(PyExc_TypeError, msgbuf);
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return 0;
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}
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else if (min == 1 && max == 1) {
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if (args == NULL) {
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PyOS_snprintf(msgbuf, sizeof(msgbuf),
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"%.200s%s takes at least one argument",
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fname==NULL ? "function" : fname,
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fname==NULL ? "" : "()");
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PyErr_SetString(PyExc_TypeError, msgbuf);
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return 0;
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}
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msg = convertitem(args, &format, p_va, levels, msgbuf,
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sizeof(msgbuf));
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if (msg == NULL)
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return 1;
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seterror(levels[0], msg, levels+1, fname, message);
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return 0;
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}
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else {
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PyErr_SetString(PyExc_SystemError,
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"old style getargs format uses new features");
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return 0;
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}
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}
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if (!PyTuple_Check(args)) {
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PyErr_SetString(PyExc_SystemError,
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"new style getargs format but argument is not a tuple");
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return 0;
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}
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len = PyTuple_GET_SIZE(args);
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if (len < min || max < len) {
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if (message == NULL) {
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PyOS_snprintf(msgbuf, sizeof(msgbuf),
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"%.150s%s takes %s %d argument%s "
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"(%d given)",
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fname==NULL ? "function" : fname,
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fname==NULL ? "" : "()",
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min==max ? "exactly"
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: len < min ? "at least" : "at most",
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len < min ? min : max,
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(len < min ? min : max) == 1 ? "" : "s",
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len);
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message = msgbuf;
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}
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PyErr_SetString(PyExc_TypeError, message);
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return 0;
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}
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for (i = 0; i < len; i++) {
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if (*format == '|')
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format++;
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msg = convertitem(PyTuple_GET_ITEM(args, i), &format, p_va,
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levels, msgbuf, sizeof(msgbuf));
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if (msg) {
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seterror(i+1, msg, levels, fname, message);
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return 0;
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}
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}
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if (*format != '\0' && !isalpha((int)(*format)) &&
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*format != '(' &&
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*format != '|' && *format != ':' && *format != ';') {
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PyErr_Format(PyExc_SystemError,
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"bad format string: %.200s", formatsave);
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return 0;
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}
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return 1;
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}
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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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{
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char buf[512];
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int i;
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char *p = buf;
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if (PyErr_Occurred())
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return;
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else if (message == NULL) {
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if (fname != NULL) {
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PyOS_snprintf(p, sizeof(buf), "%.200s() ", fname);
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p += strlen(p);
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}
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if (iarg != 0) {
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PyOS_snprintf(p, sizeof(buf) - (p - buf),
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"argument %d", iarg);
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i = 0;
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p += strlen(p);
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while (levels[i] > 0 && (int)(p-buf) < 220) {
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PyOS_snprintf(p, sizeof(buf) - (buf - p),
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", item %d", levels[i]-1);
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p += strlen(p);
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i++;
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}
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}
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else {
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PyOS_snprintf(p, sizeof(buf) - (p - buf), "argument");
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p += strlen(p);
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}
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PyOS_snprintf(p, sizeof(buf) - (p - buf), " %.256s", msg);
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message = buf;
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}
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PyErr_SetString(PyExc_TypeError, message);
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}
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/* Convert a tuple argument.
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On entry, *p_format points to the character _after_ the opening '('.
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On successful exit, *p_format points to the closing ')'.
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If successful:
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*p_format and *p_va are updated,
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*levels and *msgbuf are untouched,
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and NULL is returned.
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If the argument is invalid:
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*p_format is unchanged,
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*p_va is undefined,
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*levels is a 0-terminated list of item numbers,
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*msgbuf contains an error message, whose format is:
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"must be <typename1>, not <typename2>", where:
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<typename1> is the name of the expected type, and
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<typename2> is the name of the actual type,
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and msgbuf is returned.
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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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char *msgbuf, size_t bufsize, int toplevel)
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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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int i;
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for (;;) {
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int c = *format++;
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if (c == '(') {
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if (level == 0)
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n++;
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level++;
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}
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else if (c == ')') {
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if (level == 0)
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break;
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level--;
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}
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else if (c == ':' || c == ';' || c == '\0')
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break;
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else if (level == 0 && isalpha(c))
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n++;
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}
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if (!PySequence_Check(arg) || PyString_Check(arg)) {
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levels[0] = 0;
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PyOS_snprintf(msgbuf, bufsize,
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toplevel ? "expected %d arguments, not %.50s" :
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"must be %d-item sequence, not %.50s",
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n,
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arg == Py_None ? "None" : arg->ob_type->tp_name);
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return msgbuf;
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}
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if ((i = PySequence_Size(arg)) != n) {
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levels[0] = 0;
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PyOS_snprintf(msgbuf, bufsize,
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toplevel ? "expected %d arguments, not %d" :
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"must be sequence of length %d, not %d",
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n, i);
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return msgbuf;
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}
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format = *p_format;
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for (i = 0; i < n; i++) {
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char *msg;
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PyObject *item;
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item = PySequence_GetItem(arg, i);
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msg = convertitem(item, &format, p_va, levels+1, msgbuf,
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bufsize);
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/* PySequence_GetItem calls tp->sq_item, which INCREFs */
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Py_XDECREF(item);
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if (msg != NULL) {
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levels[0] = i+1;
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return msg;
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}
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}
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*p_format = format;
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return NULL;
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}
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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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char *msgbuf, size_t bufsize)
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{
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char *msg;
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char *format = *p_format;
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if (*format == '(' /* ')' */) {
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format++;
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msg = converttuple(arg, &format, p_va, levels, msgbuf,
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bufsize, 0);
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if (msg == NULL)
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format++;
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}
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else {
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msg = convertsimple(arg, &format, p_va, msgbuf, bufsize);
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if (msg != NULL)
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levels[0] = 0;
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}
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if (msg == NULL)
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*p_format = format;
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return msg;
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}
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#define UNICODE_DEFAULT_ENCODING(arg) \
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_PyUnicode_AsDefaultEncodedString(arg, NULL)
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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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{
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assert(expected != NULL);
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assert(arg != NULL);
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PyOS_snprintf(msgbuf, bufsize,
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"must be %.50s, not %.50s", expected,
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arg == Py_None ? "None" : arg->ob_type->tp_name);
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return msgbuf;
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}
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#define CONV_UNICODE "(unicode conversion error)"
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/* Convert a non-tuple argument. Return NULL if conversion went OK,
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or a string with a message describing the failure. The message is
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formatted as "must be <desired type>, not <actual type>".
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When failing, an exception may or may not have been raised.
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Don't call if a tuple is expected.
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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)
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{
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char *format = *p_format;
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char c = *format++;
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PyObject *uarg;
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switch (c) {
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case 'b': { /* unsigned byte -- very short int */
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char *p = va_arg(*p_va, char *);
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long ival = PyInt_AsLong(arg);
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if (ival == -1 && PyErr_Occurred())
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return converterr("integer<b>", arg, msgbuf, bufsize);
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else if (ival < 0) {
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PyErr_SetString(PyExc_OverflowError,
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"unsigned byte integer is less than minimum");
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return converterr("integer<b>", arg, msgbuf, bufsize);
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}
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else if (ival > UCHAR_MAX) {
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PyErr_SetString(PyExc_OverflowError,
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"unsigned byte integer is greater than maximum");
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return converterr("integer<b>", arg, msgbuf, bufsize);
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}
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else
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*p = (unsigned char) ival;
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break;
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}
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case 'B': {/* byte sized bitfield - both signed and unsigned
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values allowed */
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char *p = va_arg(*p_va, char *);
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long ival = PyInt_AsLong(arg);
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if (ival == -1 && PyErr_Occurred())
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return converterr("integer<b>", arg, msgbuf, bufsize);
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else if (ival < SCHAR_MIN) {
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PyErr_SetString(PyExc_OverflowError,
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"byte-sized integer bitfield is less than minimum");
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return converterr("integer<B>", arg, msgbuf, bufsize);
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}
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else if (ival > (int)UCHAR_MAX) {
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PyErr_SetString(PyExc_OverflowError,
|
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"byte-sized integer bitfield is greater than maximum");
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return converterr("integer<B>", arg, msgbuf, bufsize);
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}
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else
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*p = (unsigned char) ival;
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break;
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}
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case 'h': {/* signed short int */
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short *p = va_arg(*p_va, short *);
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long ival = PyInt_AsLong(arg);
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if (ival == -1 && PyErr_Occurred())
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return converterr("integer<h>", arg, msgbuf, bufsize);
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else if (ival < SHRT_MIN) {
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PyErr_SetString(PyExc_OverflowError,
|
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"signed short integer is less than minimum");
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return converterr("integer<h>", arg, msgbuf, bufsize);
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}
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else if (ival > SHRT_MAX) {
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PyErr_SetString(PyExc_OverflowError,
|
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"signed short integer is greater than maximum");
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return converterr("integer<h>", arg, msgbuf, bufsize);
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}
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else
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*p = (short) ival;
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break;
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}
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case 'H': { /* short int sized bitfield, both signed and
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unsigned allowed */
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unsigned short *p = va_arg(*p_va, unsigned short *);
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long ival = PyInt_AsLong(arg);
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if (ival == -1 && PyErr_Occurred())
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return converterr("integer<H>", arg, msgbuf, bufsize);
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else if (ival < SHRT_MIN) {
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PyErr_SetString(PyExc_OverflowError,
|
|
"short integer bitfield is less than minimum");
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return converterr("integer<H>", arg, msgbuf, bufsize);
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}
|
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else if (ival > USHRT_MAX) {
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PyErr_SetString(PyExc_OverflowError,
|
|
"short integer bitfield is greater than maximum");
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return converterr("integer<H>", arg, msgbuf, bufsize);
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}
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else
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*p = (unsigned short) ival;
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break;
|
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}
|
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case 'i': {/* signed int */
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int *p = va_arg(*p_va, int *);
|
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long ival = PyInt_AsLong(arg);
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if (ival == -1 && PyErr_Occurred())
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return converterr("integer<i>", arg, msgbuf, bufsize);
|
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else if (ival > INT_MAX) {
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PyErr_SetString(PyExc_OverflowError,
|
|
"signed integer is greater than maximum");
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return converterr("integer<i>", arg, msgbuf, bufsize);
|
|
}
|
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else if (ival < INT_MIN) {
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PyErr_SetString(PyExc_OverflowError,
|
|
"signed integer is less than minimum");
|
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return converterr("integer<i>", arg, msgbuf, bufsize);
|
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}
|
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else
|
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*p = ival;
|
|
break;
|
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}
|
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|
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case 'l': {/* long int */
|
|
long *p = va_arg(*p_va, long *);
|
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long ival = PyInt_AsLong(arg);
|
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if (ival == -1 && PyErr_Occurred())
|
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return converterr("integer<l>", arg, msgbuf, bufsize);
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else
|
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*p = ival;
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break;
|
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}
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|
|
#ifdef HAVE_LONG_LONG
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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 converterr("long<L>", arg, msgbuf, bufsize);
|
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} else {
|
|
*p = ival;
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}
|
|
break;
|
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}
|
|
#endif
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|
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case 'f': {/* float */
|
|
float *p = va_arg(*p_va, float *);
|
|
double dval = PyFloat_AsDouble(arg);
|
|
if (PyErr_Occurred())
|
|
return converterr("float<f>", arg, msgbuf, bufsize);
|
|
else
|
|
*p = (float) dval;
|
|
break;
|
|
}
|
|
|
|
case 'd': {/* double */
|
|
double *p = va_arg(*p_va, double *);
|
|
double dval = PyFloat_AsDouble(arg);
|
|
if (PyErr_Occurred())
|
|
return converterr("float<d>", arg, msgbuf, bufsize);
|
|
else
|
|
*p = dval;
|
|
break;
|
|
}
|
|
|
|
#ifndef WITHOUT_COMPLEX
|
|
case 'D': {/* complex double */
|
|
Py_complex *p = va_arg(*p_va, Py_complex *);
|
|
Py_complex cval;
|
|
cval = PyComplex_AsCComplex(arg);
|
|
if (PyErr_Occurred())
|
|
return converterr("complex<D>", arg, msgbuf, bufsize);
|
|
else
|
|
*p = cval;
|
|
break;
|
|
}
|
|
#endif /* WITHOUT_COMPLEX */
|
|
|
|
case 'c': {/* char */
|
|
char *p = va_arg(*p_va, char *);
|
|
if (PyString_Check(arg) && PyString_Size(arg) == 1)
|
|
*p = PyString_AS_STRING(arg)[0];
|
|
else
|
|
return converterr("char", arg, msgbuf, bufsize);
|
|
break;
|
|
}
|
|
|
|
case 's': {/* string */
|
|
if (*format == '#') {
|
|
void **p = (void **)va_arg(*p_va, char **);
|
|
int *q = va_arg(*p_va, int *);
|
|
|
|
if (PyString_Check(arg)) {
|
|
*p = PyString_AS_STRING(arg);
|
|
*q = PyString_GET_SIZE(arg);
|
|
}
|
|
#ifdef Py_USING_UNICODE
|
|
else if (PyUnicode_Check(arg)) {
|
|
uarg = UNICODE_DEFAULT_ENCODING(arg);
|
|
if (uarg == NULL)
|
|
return converterr(CONV_UNICODE,
|
|
arg, msgbuf, bufsize);
|
|
*p = PyString_AS_STRING(uarg);
|
|
*q = PyString_GET_SIZE(uarg);
|
|
}
|
|
#endif
|
|
else { /* any buffer-like object */
|
|
char *buf;
|
|
int count = convertbuffer(arg, p, &buf);
|
|
if (count < 0)
|
|
return converterr(buf, arg, msgbuf, bufsize);
|
|
*q = count;
|
|
}
|
|
format++;
|
|
} else {
|
|
char **p = va_arg(*p_va, char **);
|
|
|
|
if (PyString_Check(arg))
|
|
*p = PyString_AS_STRING(arg);
|
|
#ifdef Py_USING_UNICODE
|
|
else if (PyUnicode_Check(arg)) {
|
|
uarg = UNICODE_DEFAULT_ENCODING(arg);
|
|
if (uarg == NULL)
|
|
return converterr(CONV_UNICODE,
|
|
arg, msgbuf, bufsize);
|
|
*p = PyString_AS_STRING(uarg);
|
|
}
|
|
#endif
|
|
else
|
|
return converterr("string", arg, msgbuf, bufsize);
|
|
if ((int)strlen(*p) != PyString_Size(arg))
|
|
return converterr("string without null bytes",
|
|
arg, msgbuf, bufsize);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case 'z': {/* string, may be NULL (None) */
|
|
if (*format == '#') { /* any buffer-like object */
|
|
void **p = (void **)va_arg(*p_va, char **);
|
|
int *q = va_arg(*p_va, int *);
|
|
|
|
if (arg == Py_None) {
|
|
*p = 0;
|
|
*q = 0;
|
|
}
|
|
else if (PyString_Check(arg)) {
|
|
*p = PyString_AS_STRING(arg);
|
|
*q = PyString_GET_SIZE(arg);
|
|
}
|
|
#ifdef Py_USING_UNICODE
|
|
else if (PyUnicode_Check(arg)) {
|
|
uarg = UNICODE_DEFAULT_ENCODING(arg);
|
|
if (uarg == NULL)
|
|
return converterr(CONV_UNICODE,
|
|
arg, msgbuf, bufsize);
|
|
*p = PyString_AS_STRING(uarg);
|
|
*q = PyString_GET_SIZE(uarg);
|
|
}
|
|
#endif
|
|
else { /* any buffer-like object */
|
|
char *buf;
|
|
int count = convertbuffer(arg, p, &buf);
|
|
if (count < 0)
|
|
return converterr(buf, arg, msgbuf, bufsize);
|
|
*q = count;
|
|
}
|
|
format++;
|
|
} else {
|
|
char **p = va_arg(*p_va, char **);
|
|
|
|
if (arg == Py_None)
|
|
*p = 0;
|
|
else if (PyString_Check(arg))
|
|
*p = PyString_AS_STRING(arg);
|
|
#ifdef Py_USING_UNICODE
|
|
else if (PyUnicode_Check(arg)) {
|
|
uarg = UNICODE_DEFAULT_ENCODING(arg);
|
|
if (uarg == NULL)
|
|
return converterr(CONV_UNICODE,
|
|
arg, msgbuf, bufsize);
|
|
*p = PyString_AS_STRING(uarg);
|
|
}
|
|
#endif
|
|
else
|
|
return converterr("string or None",
|
|
arg, msgbuf, bufsize);
|
|
if (*format == '#') {
|
|
int *q = va_arg(*p_va, int *);
|
|
if (arg == Py_None)
|
|
*q = 0;
|
|
else
|
|
*q = PyString_Size(arg);
|
|
format++;
|
|
}
|
|
else if (*p != NULL &&
|
|
(int)strlen(*p) != PyString_Size(arg))
|
|
return converterr(
|
|
"string without null bytes or None",
|
|
arg, msgbuf, bufsize);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case 'e': {/* encoded string */
|
|
char **buffer;
|
|
const char *encoding;
|
|
PyObject *s;
|
|
int size, recode_strings;
|
|
|
|
/* Get 'e' parameter: the encoding name */
|
|
encoding = (const char *)va_arg(*p_va, const char *);
|
|
#ifdef Py_USING_UNICODE
|
|
if (encoding == NULL)
|
|
encoding = PyUnicode_GetDefaultEncoding();
|
|
#endif
|
|
|
|
/* 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 && PyString_Check(arg)) {
|
|
s = arg;
|
|
Py_INCREF(s);
|
|
}
|
|
else {
|
|
#ifdef Py_USING_UNICODE
|
|
PyObject *u;
|
|
|
|
/* Convert object to Unicode */
|
|
u = PyUnicode_FromObject(arg);
|
|
if (u == NULL)
|
|
return converterr(
|
|
"string or unicode or text buffer",
|
|
arg, msgbuf, bufsize);
|
|
|
|
/* Encode object; use default error handling */
|
|
s = PyUnicode_AsEncodedString(u,
|
|
encoding,
|
|
NULL);
|
|
Py_DECREF(u);
|
|
if (s == NULL)
|
|
return converterr("(encoding failed)",
|
|
arg, msgbuf, bufsize);
|
|
if (!PyString_Check(s)) {
|
|
Py_DECREF(s);
|
|
return converterr(
|
|
"(encoder failed to return a string)",
|
|
arg, msgbuf, bufsize);
|
|
}
|
|
#else
|
|
return converterr("string<e>", arg, msgbuf, bufsize);
|
|
#endif
|
|
}
|
|
size = PyString_GET_SIZE(s);
|
|
|
|
/* 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
|
|
|
|
*/
|
|
int *buffer_len = va_arg(*p_va, int *);
|
|
|
|
format++;
|
|
if (buffer_len == NULL)
|
|
return converterr(
|
|
"(buffer_len is NULL)",
|
|
arg, msgbuf, bufsize);
|
|
if (*buffer == NULL) {
|
|
*buffer = PyMem_NEW(char, size + 1);
|
|
if (*buffer == NULL) {
|
|
Py_DECREF(s);
|
|
return converterr(
|
|
"(memory error)",
|
|
arg, msgbuf, bufsize);
|
|
}
|
|
} else {
|
|
if (size + 1 > *buffer_len) {
|
|
Py_DECREF(s);
|
|
return converterr(
|
|
"(buffer overflow)",
|
|
arg, msgbuf, bufsize);
|
|
}
|
|
}
|
|
memcpy(*buffer,
|
|
PyString_AS_STRING(s),
|
|
size + 1);
|
|
*buffer_len = 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 ((int)strlen(PyString_AS_STRING(s)) != size)
|
|
return converterr(
|
|
"(encoded string without NULL bytes)",
|
|
arg, msgbuf, bufsize);
|
|
*buffer = PyMem_NEW(char, size + 1);
|
|
if (*buffer == NULL) {
|
|
Py_DECREF(s);
|
|
return converterr("(memory error)",
|
|
arg, msgbuf, bufsize);
|
|
}
|
|
memcpy(*buffer,
|
|
PyString_AS_STRING(s),
|
|
size + 1);
|
|
}
|
|
Py_DECREF(s);
|
|
break;
|
|
}
|
|
|
|
#ifdef Py_USING_UNICODE
|
|
case 'u': {/* raw unicode buffer (Py_UNICODE *) */
|
|
if (*format == '#') { /* any buffer-like object */
|
|
void **p = (void **)va_arg(*p_va, char **);
|
|
int *q = va_arg(*p_va, int *);
|
|
char *buf;
|
|
int count = convertbuffer(arg, p, &buf);
|
|
|
|
if (count < 0)
|
|
return converterr(buf, arg, msgbuf, bufsize);
|
|
*q = count/(sizeof(Py_UNICODE));
|
|
format++;
|
|
} else {
|
|
Py_UNICODE **p = va_arg(*p_va, Py_UNICODE **);
|
|
|
|
if (PyUnicode_Check(arg))
|
|
*p = PyUnicode_AS_UNICODE(arg);
|
|
else
|
|
return converterr("unicode", arg, msgbuf, bufsize);
|
|
}
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
case 'S': { /* string object */
|
|
PyObject **p = va_arg(*p_va, PyObject **);
|
|
if (PyString_Check(arg))
|
|
*p = arg;
|
|
else
|
|
return converterr("string", arg, msgbuf, bufsize);
|
|
break;
|
|
}
|
|
|
|
#ifdef Py_USING_UNICODE
|
|
case 'U': { /* Unicode object */
|
|
PyObject **p = va_arg(*p_va, PyObject **);
|
|
if (PyUnicode_Check(arg))
|
|
*p = arg;
|
|
else
|
|
return converterr("unicode", arg, msgbuf, bufsize);
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
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(arg->ob_type, type))
|
|
*p = arg;
|
|
else
|
|
return converterr(type->tp_name, arg, msgbuf, bufsize);
|
|
|
|
}
|
|
else if (*format == '?') {
|
|
inquiry pred = va_arg(*p_va, inquiry);
|
|
p = va_arg(*p_va, PyObject **);
|
|
format++;
|
|
if ((*pred)(arg))
|
|
*p = arg;
|
|
else
|
|
return converterr("(unspecified)",
|
|
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 *);
|
|
format++;
|
|
if (! (*convert)(arg, addr))
|
|
return converterr("(unspecified)",
|
|
arg, msgbuf, bufsize);
|
|
}
|
|
else {
|
|
p = va_arg(*p_va, PyObject **);
|
|
*p = arg;
|
|
}
|
|
break;
|
|
}
|
|
|
|
|
|
case 'w': { /* memory buffer, read-write access */
|
|
void **p = va_arg(*p_va, void **);
|
|
PyBufferProcs *pb = arg->ob_type->tp_as_buffer;
|
|
int count;
|
|
|
|
if (pb == NULL ||
|
|
pb->bf_getwritebuffer == NULL ||
|
|
pb->bf_getsegcount == NULL)
|
|
return converterr("read-write buffer", arg, msgbuf, bufsize);
|
|
if ((*pb->bf_getsegcount)(arg, NULL) != 1)
|
|
return converterr("single-segment read-write buffer",
|
|
arg, msgbuf, bufsize);
|
|
if ((count = pb->bf_getwritebuffer(arg, 0, p)) < 0)
|
|
return converterr("(unspecified)", arg, msgbuf, bufsize);
|
|
if (*format == '#') {
|
|
int *q = va_arg(*p_va, int *);
|
|
|
|
*q = count;
|
|
format++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case 't': { /* 8-bit character buffer, read-only access */
|
|
const char **p = va_arg(*p_va, const char **);
|
|
PyBufferProcs *pb = arg->ob_type->tp_as_buffer;
|
|
int count;
|
|
|
|
if (*format++ != '#')
|
|
return converterr(
|
|
"invalid use of 't' format character",
|
|
arg, msgbuf, bufsize);
|
|
if (!PyType_HasFeature(arg->ob_type,
|
|
Py_TPFLAGS_HAVE_GETCHARBUFFER) ||
|
|
pb == NULL || pb->bf_getcharbuffer == NULL ||
|
|
pb->bf_getsegcount == NULL)
|
|
return converterr(
|
|
"string or read-only character buffer",
|
|
arg, msgbuf, bufsize);
|
|
|
|
if (pb->bf_getsegcount(arg, NULL) != 1)
|
|
return converterr(
|
|
"string or single-segment read-only buffer",
|
|
arg, msgbuf, bufsize);
|
|
|
|
count = pb->bf_getcharbuffer(arg, 0, p);
|
|
if (count < 0)
|
|
return converterr("(unspecified)", arg, msgbuf, bufsize);
|
|
*va_arg(*p_va, int *) = count;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
return converterr("impossible<bad format char>", arg, msgbuf, bufsize);
|
|
|
|
}
|
|
|
|
*p_format = format;
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
convertbuffer(PyObject *arg, void **p, char **errmsg)
|
|
{
|
|
PyBufferProcs *pb = arg->ob_type->tp_as_buffer;
|
|
int count;
|
|
if (pb == NULL ||
|
|
pb->bf_getreadbuffer == NULL ||
|
|
pb->bf_getsegcount == NULL) {
|
|
*errmsg = "string or read-only buffer";
|
|
return -1;
|
|
}
|
|
if ((*pb->bf_getsegcount)(arg, NULL) != 1) {
|
|
*errmsg = "string or single-segment read-only buffer";
|
|
return -1;
|
|
}
|
|
if ((count = (*pb->bf_getreadbuffer)(arg, 0, p)) < 0) {
|
|
*errmsg = "(unspecified)";
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/* Support for keyword arguments donated by
|
|
Geoff Philbrick <philbric@delphi.hks.com> */
|
|
|
|
/* Return false (0) for error, else true. */
|
|
int
|
|
PyArg_ParseTupleAndKeywords(PyObject *args,
|
|
PyObject *keywords,
|
|
char *format,
|
|
char **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);
|
|
va_end(va);
|
|
return retval;
|
|
}
|
|
|
|
|
|
static int
|
|
vgetargskeywords(PyObject *args, PyObject *keywords, char *format,
|
|
char **kwlist, va_list *p_va)
|
|
{
|
|
char msgbuf[512];
|
|
int levels[32];
|
|
char *fname, *message;
|
|
int min, max;
|
|
char *formatsave;
|
|
int i, len, nargs, nkeywords;
|
|
char *msg, **p;
|
|
|
|
assert(args != NULL && PyTuple_Check(args));
|
|
assert(keywords == NULL || PyDict_Check(keywords));
|
|
assert(format != NULL);
|
|
assert(kwlist != NULL);
|
|
assert(p_va != NULL);
|
|
|
|
/* Search the format:
|
|
message <- error msg, if any (else NULL).
|
|
fname <- routine name, if any (else NULL).
|
|
min <- # of required arguments, or -1 if all are required.
|
|
max <- most arguments (required + optional).
|
|
Check that kwlist has a non-NULL entry for each arg.
|
|
Raise error if a tuple arg spec is found.
|
|
*/
|
|
fname = message = NULL;
|
|
formatsave = format;
|
|
p = kwlist;
|
|
min = -1;
|
|
max = 0;
|
|
while ((i = *format++) != '\0') {
|
|
if (isalpha(i) && i != 'e') {
|
|
max++;
|
|
if (*p == NULL) {
|
|
PyErr_SetString(PyExc_RuntimeError,
|
|
"more argument specifiers than "
|
|
"keyword list entries");
|
|
return 0;
|
|
}
|
|
p++;
|
|
}
|
|
else if (i == '|')
|
|
min = max;
|
|
else if (i == ':') {
|
|
fname = format;
|
|
break;
|
|
}
|
|
else if (i == ';') {
|
|
message = format;
|
|
break;
|
|
}
|
|
else if (i == '(') {
|
|
PyErr_SetString(PyExc_RuntimeError,
|
|
"tuple found in format when using keyword "
|
|
"arguments");
|
|
return 0;
|
|
}
|
|
}
|
|
format = formatsave;
|
|
if (*p != NULL) {
|
|
PyErr_SetString(PyExc_RuntimeError,
|
|
"more keyword list entries than "
|
|
"argument specifiers");
|
|
return 0;
|
|
}
|
|
if (min < 0) {
|
|
/* All arguments are required. */
|
|
min = max;
|
|
}
|
|
|
|
nargs = PyTuple_GET_SIZE(args);
|
|
nkeywords = keywords == NULL ? 0 : PyDict_Size(keywords);
|
|
|
|
/* make sure there are no duplicate values for an argument;
|
|
its not clear when to use the term "keyword argument vs.
|
|
keyword parameter in messages */
|
|
if (nkeywords > 0) {
|
|
for (i = 0; i < nargs; i++) {
|
|
char *thiskw = kwlist[i];
|
|
if (thiskw == NULL)
|
|
break;
|
|
if (PyDict_GetItemString(keywords, thiskw)) {
|
|
PyErr_Format(PyExc_TypeError,
|
|
"keyword parameter '%s' was given "
|
|
"by position and by name",
|
|
thiskw);
|
|
return 0;
|
|
}
|
|
else if (PyErr_Occurred())
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* required arguments missing from args can be supplied by keyword
|
|
arguments; set len to the number of posiitional arguments, and,
|
|
if that's less than the minimum required, add in the number of
|
|
required arguments that are supplied by keywords */
|
|
len = nargs;
|
|
if (nkeywords > 0 && nargs < min) {
|
|
for (i = nargs; i < min; i++) {
|
|
if (PyDict_GetItemString(keywords, kwlist[i]))
|
|
len++;
|
|
else if (PyErr_Occurred())
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* make sure we got an acceptable number of arguments; the message
|
|
is a little confusing with keywords since keyword arguments
|
|
which are supplied, but don't match the required arguments
|
|
are not included in the "%d given" part of the message */
|
|
if (len < min || max < len) {
|
|
if (message == NULL) {
|
|
PyOS_snprintf(msgbuf, sizeof(msgbuf),
|
|
"%.200s%s takes %s %d argument%s "
|
|
"(%d given)",
|
|
fname==NULL ? "function" : fname,
|
|
fname==NULL ? "" : "()",
|
|
min==max ? "exactly"
|
|
: len < min ? "at least" : "at most",
|
|
len < min ? min : max,
|
|
(len < min ? min : max) == 1 ? "" : "s",
|
|
len);
|
|
message = msgbuf;
|
|
}
|
|
PyErr_SetString(PyExc_TypeError, message);
|
|
return 0;
|
|
}
|
|
|
|
/* convert the positional arguments */
|
|
for (i = 0; i < nargs; i++) {
|
|
if (*format == '|')
|
|
format++;
|
|
msg = convertitem(PyTuple_GET_ITEM(args, i), &format, p_va,
|
|
levels, msgbuf, sizeof(msgbuf));
|
|
if (msg) {
|
|
seterror(i+1, msg, levels, fname, message);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* handle no keyword parameters in call */
|
|
if (nkeywords == 0)
|
|
return 1;
|
|
|
|
/* convert the keyword arguments; this uses the format
|
|
string where it was left after processing args */
|
|
for (i = nargs; i < max; i++) {
|
|
PyObject *item;
|
|
if (*format == '|')
|
|
format++;
|
|
item = PyDict_GetItemString(keywords, kwlist[i]);
|
|
if (item != NULL) {
|
|
Py_INCREF(item);
|
|
msg = convertitem(item, &format, p_va, levels, msgbuf,
|
|
sizeof(msgbuf));
|
|
Py_DECREF(item);
|
|
if (msg) {
|
|
seterror(i+1, msg, levels, fname, message);
|
|
return 0;
|
|
}
|
|
--nkeywords;
|
|
if (nkeywords == 0)
|
|
break;
|
|
}
|
|
else if (PyErr_Occurred())
|
|
return 0;
|
|
else {
|
|
msg = skipitem(&format, p_va);
|
|
if (msg) {
|
|
seterror(i+1, msg, levels, fname, message);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* make sure there are no extraneous keyword arguments */
|
|
if (nkeywords > 0) {
|
|
PyObject *key, *value;
|
|
int pos = 0;
|
|
while (PyDict_Next(keywords, &pos, &key, &value)) {
|
|
int match = 0;
|
|
char *ks = PyString_AsString(key);
|
|
for (i = 0; i < max; i++) {
|
|
if (!strcmp(ks, kwlist[i])) {
|
|
match = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!match) {
|
|
PyErr_Format(PyExc_TypeError,
|
|
"'%s' is an invalid keyword "
|
|
"argument for this function",
|
|
ks);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
static char *
|
|
skipitem(char **p_format, va_list *p_va)
|
|
{
|
|
char *format = *p_format;
|
|
char c = *format++;
|
|
|
|
switch (c) {
|
|
|
|
case 'b': /* byte -- very short int */
|
|
case 'B': /* byte as bitfield */
|
|
{
|
|
(void) va_arg(*p_va, char *);
|
|
break;
|
|
}
|
|
|
|
case 'h': /* short int */
|
|
{
|
|
(void) va_arg(*p_va, short *);
|
|
break;
|
|
}
|
|
|
|
case 'H': /* short int as bitfield */
|
|
{
|
|
(void) va_arg(*p_va, unsigned short *);
|
|
break;
|
|
}
|
|
|
|
case 'i': /* int */
|
|
{
|
|
(void) va_arg(*p_va, int *);
|
|
break;
|
|
}
|
|
|
|
case 'l': /* long int */
|
|
{
|
|
(void) va_arg(*p_va, long *);
|
|
break;
|
|
}
|
|
|
|
#ifdef HAVE_LONG_LONG
|
|
case 'L': /* LONG_LONG int */
|
|
{
|
|
(void) va_arg(*p_va, LONG_LONG *);
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
case 'f': /* float */
|
|
{
|
|
(void) va_arg(*p_va, float *);
|
|
break;
|
|
}
|
|
|
|
case 'd': /* double */
|
|
{
|
|
(void) va_arg(*p_va, double *);
|
|
break;
|
|
}
|
|
|
|
#ifndef WITHOUT_COMPLEX
|
|
case 'D': /* complex double */
|
|
{
|
|
(void) va_arg(*p_va, Py_complex *);
|
|
break;
|
|
}
|
|
#endif /* WITHOUT_COMPLEX */
|
|
|
|
case 'c': /* char */
|
|
{
|
|
(void) va_arg(*p_va, char *);
|
|
break;
|
|
}
|
|
|
|
case 's': /* string */
|
|
{
|
|
(void) va_arg(*p_va, char **);
|
|
if (*format == '#') {
|
|
(void) va_arg(*p_va, int *);
|
|
format++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case 'z': /* string */
|
|
{
|
|
(void) va_arg(*p_va, char **);
|
|
if (*format == '#') {
|
|
(void) va_arg(*p_va, int *);
|
|
format++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case 'S': /* string object */
|
|
{
|
|
(void) va_arg(*p_va, PyObject **);
|
|
break;
|
|
}
|
|
|
|
case 'O': /* object */
|
|
{
|
|
if (*format == '!') {
|
|
format++;
|
|
(void) va_arg(*p_va, PyTypeObject*);
|
|
(void) va_arg(*p_va, PyObject **);
|
|
}
|
|
#if 0
|
|
/* I don't know what this is for */
|
|
else if (*format == '?') {
|
|
inquiry pred = va_arg(*p_va, inquiry);
|
|
format++;
|
|
if ((*pred)(arg)) {
|
|
(void) va_arg(*p_va, PyObject **);
|
|
}
|
|
}
|
|
#endif
|
|
else if (*format == '&') {
|
|
typedef int (*converter)(PyObject *, void *);
|
|
(void) va_arg(*p_va, converter);
|
|
(void) va_arg(*p_va, void *);
|
|
format++;
|
|
}
|
|
else {
|
|
(void) va_arg(*p_va, PyObject **);
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
return "impossible<bad format char>";
|
|
|
|
}
|
|
|
|
*p_format = format;
|
|
return NULL;
|
|
}
|
|
|
|
|
|
int
|
|
PyArg_UnpackTuple(PyObject *args, char *name, int min, int max, ...)
|
|
{
|
|
int i, l;
|
|
PyObject **o;
|
|
va_list vargs;
|
|
|
|
#ifdef HAVE_STDARG_PROTOTYPES
|
|
va_start(vargs, max);
|
|
#else
|
|
va_start(vargs);
|
|
#endif
|
|
|
|
assert(min >= 0);
|
|
assert(min <= max);
|
|
if (!PyTuple_Check(args)) {
|
|
PyErr_SetString(PyExc_SystemError,
|
|
"PyArg_UnpackTuple() argument list is not a tuple");
|
|
return 0;
|
|
}
|
|
l = PyTuple_GET_SIZE(args);
|
|
if (l < min) {
|
|
if (name != NULL)
|
|
PyErr_Format(
|
|
PyExc_TypeError,
|
|
"%s expected %s%d arguments, got %d",
|
|
name, (min == max ? "" : "at least "), min, l);
|
|
else
|
|
PyErr_Format(
|
|
PyExc_TypeError,
|
|
"unpacked tuple should have %s%d elements,"
|
|
" but has %d",
|
|
(min == max ? "" : "at least "), min, l);
|
|
va_end(vargs);
|
|
return 0;
|
|
}
|
|
if (l > max) {
|
|
if (name != NULL)
|
|
PyErr_Format(
|
|
PyExc_TypeError,
|
|
"%s expected %s%d arguments, got %d",
|
|
name, (min == max ? "" : "at most "), max, l);
|
|
else
|
|
PyErr_Format(
|
|
PyExc_TypeError,
|
|
"unpacked tuple should have %s%d elements,"
|
|
" but has %d",
|
|
(min == max ? "" : "at most "), max, l);
|
|
va_end(vargs);
|
|
return 0;
|
|
}
|
|
for (i = 0; i < l; i++) {
|
|
o = va_arg(vargs, PyObject **);
|
|
*o = PyTuple_GET_ITEM(args, i);
|
|
}
|
|
va_end(vargs);
|
|
return 1;
|
|
}
|