Fix buffer format parsing code to allow the digit '9' in numbers.

Closes GH-2845.

Cython/Utility/Buffer.c

@@ -273,7 +273,7 @@ static int __Pyx_BufFmt_ParseNumber(const char** ts) {
       return -1;
     } else {
         count = *t++ - '0';
-        while (*t >= '0' && *t < '9') {
+        while (*t >= '0' && *t <= '9') {
             count *= 10;
             count += *t++ - '0';
         }

tests/buffers/buffmt.pyx

@@ -37,7 +37,7 @@ if int_align != 4 or sizeof(int) != 4:
 cdef class MockBuffer:
     cdef Py_ssize_t zero
     cdef Py_ssize_t minusone
-    cdef object format
+    cdef bytes format
     cdef object itemsize
 
     def __init__(self, format, itemsize):
@@ -117,6 +117,9 @@ ctypedef struct Char3Int:
     int c
     int d
 
+ctypedef struct LongString:
+    char[90198] c
+
 cdef struct CharIntCFloat:
     char a
     int b
@@ -180,6 +183,16 @@ def char3int(fmt):
     cdef object obj = MockBuffer(fmt, sizeof(Char3Int))
     cdef object[Char3Int, ndim=1] buf = obj
 
+
+@testcase
+def long_string(fmt):
+    """
+    >>> long_string("90198s")
+    """
+    cdef object obj = MockBuffer(fmt, sizeof(LongString))
+    cdef object[LongString, ndim=1] buf = obj
+
+
 @testcase
 def unpacked_struct(fmt):
     """