Trent Mick <trentm@activestate.com>:

This patch fixes the posix module for large file support mainly on
Win64, although some general cleanup is done as well.

The changes are:

- abstract stat->STAT, fstat->FSTAT, and struct stat->STRUCT_STAT
This is because stat() etc. are not the correct functions to use on
Win64 (nor maybe on other platforms?, if not then it is now trivial to
select the appropriate one). On Win64 the appropriate system functions
are _stati64(), etc.

- add _pystat_fromstructstat(), it builds the return tuple for the
fstat system call. This functionality was being duplicated. As well
the construction of the tuple was modified to ensure no overflow of
the time_t elements (sizeof(time_t) > sizeof(long) on Win64).

- add overflow protection for the return values of posix_spawnv and
posix_spawnve

- use the proper 64-bit capable lseek() on Win64

- use intptr_t instead of long where appropriate from Win32/64 blocks
(sizeof(void*) > sizeof(long) on Win64)

This closes SourceForge patch #100513.

1 files changed, 102 insertions, 67 deletions

diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 809c24a..f897d0a 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -284,6 +284,18 @@ extern int lstat Py_PROTO((const char *, struct stat *));
 #define USE_TMPNAM_R
 #endif
 
+/* choose the appropriate stat and fstat functions and return structs */
+#ifdef MS_WIN64
+#	define STAT _stati64
+#	define FSTAT _fstati64
+#	define STRUCT_STAT struct _stati64
+#else
+#	define STAT stat
+#	define FSTAT fstat
+#	define STRUCT_STAT struct stat
+#endif
+
+
 /* Return a dictionary corresponding to the POSIX environment table */
 
 #if !defined(_MSC_VER) && ( !defined(__WATCOMC__) || defined(__QNX__) )
@@ -539,14 +551,64 @@ posix_strintint(args, format, func)
 	return Py_None;
 }
 
+
+
+/* pack a system stat C structure into the Python stat tuple 
+   (used by posix_stat() and posix_fstat()) */
+static PyObject*
+_pystat_fromstructstat(st)
+	STRUCT_STAT st;
+{
+	PyObject *v = PyTuple_New(10);
+	if (v == NULL)
+		return NULL;
+
+	PyTuple_SetItem(v, 0, PyInt_FromLong((long)st.st_mode));
+#ifdef HAVE_LARGEFILE_SUPPORT
+	PyTuple_SetItem(v, 1, PyLong_FromLongLong((LONG_LONG)st.st_ino));
+#else
+	PyTuple_SetItem(v, 1, PyInt_FromLong((long)st.st_ino));
+#endif
+#if defined(HAVE_LONG_LONG) && !defined(MS_WINDOWS)
+	PyTuple_SetItem(v, 2, PyLong_FromLongLong((LONG_LONG)st.st_dev));
+#else
+	PyTuple_SetItem(v, 2, PyInt_FromLong((long)st.st_dev));
+#endif
+	PyTuple_SetItem(v, 3, PyInt_FromLong((long)st.st_nlink));
+	PyTuple_SetItem(v, 4, PyInt_FromLong((long)st.st_uid));
+	PyTuple_SetItem(v, 5, PyInt_FromLong((long)st.st_gid));
+#ifdef HAVE_LARGEFILE_SUPPORT
+	PyTuple_SetItem(v, 6, PyLong_FromLongLong((LONG_LONG)st.st_size));
+#else
+	PyTuple_SetItem(v, 6, PyInt_FromLong(st.st_size));
+#endif
+#if SIZEOF_TIME_T > SIZEOF_LONG
+	PyTuple_SetItem(v, 7, PyLong_FromLongLong((LONG_LONG)st.st_atime));
+	PyTuple_SetItem(v, 8, PyLong_FromLongLong((LONG_LONG)st.st_mtime));
+	PyTuple_SetItem(v, 9, PyLong_FromLongLong((LONG_LONG)st.st_ctime));
+#else
+	PyTuple_SetItem(v, 7, PyInt_FromLong((long)st.st_atime));
+	PyTuple_SetItem(v, 8, PyInt_FromLong((long)st.st_mtime));
+	PyTuple_SetItem(v, 9, PyInt_FromLong((long)st.st_ctime));
+#endif
+
+	if (PyErr_Occurred()) {
+		Py_DECREF(v);
+		return NULL;
+	}
+
+	return v;
+}
+
+
 static PyObject *
 posix_do_stat(self, args, format, statfunc)
 	PyObject *self;
 	PyObject *args;
         char *format;
-	int (*statfunc) Py_FPROTO((const char *, struct stat *));
+	int (*statfunc) Py_FPROTO((const char *, STRUCT_STAT *));
 {
-	struct stat st;
+	STRUCT_STAT st;
 	char *path;
 	int res;
 
@@ -585,31 +647,8 @@ posix_do_stat(self, args, format, statfunc)
 	Py_END_ALLOW_THREADS
 	if (res != 0)
 		return posix_error_with_filename(path);
-#if !defined(HAVE_LARGEFILE_SUPPORT)
-	return Py_BuildValue("(llllllllll)",
-			     (long)st.st_mode,
-			     (long)st.st_ino,
-			     (long)st.st_dev,
-			     (long)st.st_nlink,
-			     (long)st.st_uid,
-			     (long)st.st_gid,
-			     (long)st.st_size,
-			     (long)st.st_atime,
-			     (long)st.st_mtime,
-			     (long)st.st_ctime);
-#else
-	return Py_BuildValue("(lLllllLlll)",
-			     (long)st.st_mode,
-			     (LONG_LONG)st.st_ino,
-			     (long)st.st_dev,
-			     (long)st.st_nlink,
-			     (long)st.st_uid,
-			     (long)st.st_gid,
-			     (LONG_LONG)st.st_size,
-			     (long)st.st_atime,
-			     (long)st.st_mtime,
-			     (long)st.st_ctime);
-#endif
+
+	return _pystat_fromstructstat(st);
 }
 
 
@@ -1158,7 +1197,7 @@ posix_stat(self, args)
 	PyObject *self;
 	PyObject *args;
 {
-	return posix_do_stat(self, args, "s:stat", stat);
+	return posix_do_stat(self, args, "s:stat", STAT);
 }
 
 
@@ -1546,6 +1585,7 @@ posix_spawnv(self, args)
 	PyObject *argv;
 	char **argvlist;
 	int mode, i, argc;
+	intptr_t spawnval;
 	PyObject *(*getitem) Py_PROTO((PyObject *, int));
 
 	/* spawnv has three arguments: (mode, path, argv), where
@@ -1581,14 +1621,18 @@ posix_spawnv(self, args)
 
 	if (mode == _OLD_P_OVERLAY)
 		mode = _P_OVERLAY;
-	i = _spawnv(mode, path, argvlist);
+	spawnval = _spawnv(mode, path, argvlist);
 
 	PyMem_DEL(argvlist);
 
-	if (i == -1)
+	if (spawnval == -1)
 		return posix_error();
 	else
-		return Py_BuildValue("i", i);
+#if SIZEOF_LONG == SIZE_VOID_P
+		return Py_BuildValue("l", spawnval);
+#else
+		return Py_BuildValue("L", spawnval);
+#endif
 }
 
 
@@ -1612,6 +1656,7 @@ posix_spawnve(self, args)
 	char **envlist;
 	PyObject *key, *val, *keys=NULL, *vals=NULL, *res=NULL;
 	int mode, i, pos, argc, envc;
+	intptr_t spawnval;
 	PyObject *(*getitem) Py_PROTO((PyObject *, int));
 
 	/* spawnve has four arguments: (mode, path, argv, env), where
@@ -1689,11 +1734,15 @@ posix_spawnve(self, args)
 
 	if (mode == _OLD_P_OVERLAY)
 		mode = _P_OVERLAY;
-	i = _spawnve(mode, path, argvlist, envlist);
-	if (i == -1)
+	spawnval = _spawnve(mode, path, argvlist, envlist);
+	if (spawnval == -1)
 		(void) posix_error();
 	else
-		res = Py_BuildValue("i", i);
+#if SIZEOF_LONG == SIZE_VOID_P
+		res = Py_BuildValue("l", spawnval);
+#else
+		res = Py_BuildValue("L", spawnval);
+#endif
 
  fail_2:
 	while (--envc >= 0)
@@ -2328,7 +2377,7 @@ posix_lstat(self, args)
 #ifdef HAVE_LSTAT
 	return posix_do_stat(self, args, "s:lstat", lstat);
 #else /* !HAVE_LSTAT */
-	return posix_do_stat(self, args, "s:lstat", stat);
+	return posix_do_stat(self, args, "s:lstat", STAT);
 #endif /* !HAVE_LSTAT */
 }
 
@@ -2652,7 +2701,11 @@ posix_lseek(self, args)
 	PyObject *args;
 {
 	int fd, how;
+#ifdef MS_WIN64
+	LONG_LONG pos, res;
+#else
 	off_t pos, res;
+#endif
 	PyObject *posobj;
 	if (!PyArg_ParseTuple(args, "iOi:lseek", &fd, &posobj, &how))
 		return NULL;
@@ -2675,7 +2728,11 @@ posix_lseek(self, args)
 		return NULL;
 
 	Py_BEGIN_ALLOW_THREADS
+#ifdef MS_WIN64
+	res = _lseeki64(fd, pos, how);
+#else
 	res = lseek(fd, pos, how);
+#endif
 	Py_END_ALLOW_THREADS
 	if (res < 0)
 		return posix_error();
@@ -2749,40 +2806,17 @@ posix_fstat(self, args)
 	PyObject *args;
 {
 	int fd;
-	struct stat st;
+	STRUCT_STAT st;
 	int res;
 	if (!PyArg_ParseTuple(args, "i:fstat", &fd))
 		return NULL;
 	Py_BEGIN_ALLOW_THREADS
-	res = fstat(fd, &st);
+	res = FSTAT(fd, &st);
 	Py_END_ALLOW_THREADS
 	if (res != 0)
 		return posix_error();
-#if !defined(HAVE_LARGEFILE_SUPPORT)
-	return Py_BuildValue("(llllllllll)",
-			     (long)st.st_mode,
-			     (long)st.st_ino,
-			     (long)st.st_dev,
-			     (long)st.st_nlink,
-			     (long)st.st_uid,
-			     (long)st.st_gid,
-			     (long)st.st_size,
-			     (long)st.st_atime,
-			     (long)st.st_mtime,
-			     (long)st.st_ctime);
-#else
-	return Py_BuildValue("(lLllllLlll)",
-			     (long)st.st_mode,
-			     (LONG_LONG)st.st_ino,
-			     (long)st.st_dev,
-			     (long)st.st_nlink,
-			     (long)st.st_uid,
-			     (long)st.st_gid,
-			     (LONG_LONG)st.st_size,
-			     (long)st.st_atime,
-			     (long)st.st_mtime,
-			     (long)st.st_ctime);
-#endif
+	
+	return _pystat_fromstructstat(st);
 }
 
 
@@ -2863,8 +2897,8 @@ posix_pipe(self, args)
 	Py_END_ALLOW_THREADS
 	if (!ok)
 		return posix_error();
-	read_fd = _open_osfhandle((long)read, 0);
-	write_fd = _open_osfhandle((long)write, 1);
+	read_fd = _open_osfhandle((intptr_t)read, 0);
+	write_fd = _open_osfhandle((intptr_t)write, 1);
 	return Py_BuildValue("(ii)", read_fd, write_fd);
 #endif /* MS_WIN32 */
 #endif
@@ -3526,9 +3560,10 @@ conv_confname(arg, valuep, table, tablesize)
     }
     if (PyString_Check(arg)) {
         /* look up the value in the table using a binary search */
-        int lo = 0;
-        int hi = tablesize;
-        int cmp, mid;
+        size_t lo = 0;
+		size_t mid;
+        size_t hi = tablesize;
+        int cmp;
         char *confname = PyString_AS_STRING(arg);
         while (lo < hi) {
             mid = (lo + hi) / 2;