Merge pull request matplotlib#369 from mdboom/svg_locale_fix

Fix SVG path data writing so it always uses '.' as a decimal point.

Author: mdboom

src/_path.cpp

@@ -1524,8 +1524,10 @@ _path_module::convert_to_svg(const Py::Tuple& args)
 
     int precision = Py::Int(args[4]);
 
+    #if PY_VERSION_HEX < 0x02070000
     char format[64];
     snprintf(format, 64, "%s.%dg", "%", precision);
+    #endif
 
     typedef agg::conv_transform<PathIterator>  transformed_path_t;
     typedef PathNanRemover<transformed_path_t> nan_removal_t;
@@ -1568,9 +1570,23 @@ _path_module::convert_to_svg(const Py::Tuple& args)
             *p++ = ' ';
         }
 
-        p += snprintf(p, buffersize - (p - buffer), format, x);
+        #if PY_VERSION_HEX >= 0x02070000
+        char* str;
+        str = PyOS_double_to_string(x, 'g', precision, 0, NULL);
+        p += snprintf(p, buffersize - (p - buffer), str);
+        PyMem_Free(str);
         *p++ = ' ';
-        p += snprintf(p, buffersize - (p - buffer), format, y);
+        str = PyOS_double_to_string(y, 'g', precision, 0, NULL);
+        p += snprintf(p, buffersize - (p - buffer), str);
+        PyMem_Free(str);
+        #else
+        char str[64];
+        PyOS_ascii_formatd(str, 64, format, x);
+        p += snprintf(p, buffersize - (p - buffer), str);
+        *p++ = ' ';
+        PyOS_ascii_formatd(str, 64, format, y);
+        p += snprintf(p, buffersize - (p - buffer), str);
+        #endif
 
         --wait;
     }