mpatch: Define Py_ssize_t for old pythons and use it instead of ssize_t.

See also PEP 353.
NOTE: Microsoft compilers (8 or earlier) does not have ssize_t.

mercurial/mpatch.c

@@ -24,6 +24,16 b''
 #include <stdlib.h>
 #include <string.h>
 
+/* Definitions to get compatibility with python 2.4 and earlier which
+   does not have Py_ssize_t. See also PEP 353.
+   Note: msvc (8 or earlier) does not have ssize_t, so we use Py_ssize_t.
+*/
+#if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN)
+typedef int Py_ssize_t;
+#define PY_SSIZE_T_MAX INT_MAX
+#define PY_SSIZE_T_MIN INT_MIN
+#endif
+
 #ifdef _WIN32
 # ifdef _MSC_VER
 /* msvc 6.0 has problems */
@@ -312,7 +322,7 b' static int apply(char *buf, const char *'
 static struct flist *fold(PyObject *bins, int start, int end)
 {
 	int len;
-	ssize_t blen;
+	Py_ssize_t blen;
 	const char *buffer;
 
 	if (start + 1 == end) {
@@ -339,7 +349,7 b' patches(PyObject *self, PyObject *args)'
 	const char *in;
 	char *out;
 	int len, outlen;
-	ssize_t inlen;
+	Py_ssize_t inlen;
 
 	if (!PyArg_ParseTuple(args, "OO:mpatch", &text, &bins))
 		return NULL;