[Python-checkins] CVS: python/dist/src/Include floatobject.h,2.17,2.18

[Tim Peters]

Update of /cvsroot/python/python/dist/src/Include
In directory usw-pr-cvs1:/tmp/cvs-serv5500/python/dist/src/Include

Modified Files:
	floatobject.h 
Log Message:
SF bug #422177:  Results from .pyc differs from .py
Store floats and doubles to full precision in marshal.
Test that floats read from .pyc/.pyo closely match those read from .py.
Declare PyFloat_AsString() in floatobject header file.
Add new PyFloat_AsReprString() API function.
Document the functions declared in floatobject.h.


Index: floatobject.h
===================================================================
RCS file: /cvsroot/python/python/dist/src/Include/floatobject.h,v
retrieving revision 2.17
retrieving revision 2.18
diff -C2 -r2.17 -r2.18
*** floatobject.h	2000/09/01 23:29:26	2.17
--- floatobject.h	2001/05/08 15:19:57	2.18
***************
*** 21,30 ****
  #define PyFloat_Check(op) ((op)->ob_type == &PyFloat_Type)
  
! extern DL_IMPORT(PyObject *) PyFloat_FromString(PyObject*, char**);
  extern DL_IMPORT(PyObject *) PyFloat_FromDouble(double);
- extern DL_IMPORT(double) PyFloat_AsDouble(PyObject *);
  
! /* Macro, trading safety for speed */
  #define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval)
  
  #ifdef __cplusplus
--- 21,49 ----
  #define PyFloat_Check(op) ((op)->ob_type == &PyFloat_Type)
  
! /* Return Python float from string PyObject.  Second argument ignored on
!    input, and, if non-NULL, NULL is stored into *junk (this tried to serve a
!    purpose once but can't be made to work as intended). */
! extern DL_IMPORT(PyObject *) PyFloat_FromString(PyObject*, char** junk);
! 
! /* Return Python float from C double. */
  extern DL_IMPORT(PyObject *) PyFloat_FromDouble(double);
  
! /* Extract C double from Python float.  The macro version trades safety for
!    speed. */
! extern DL_IMPORT(double) PyFloat_AsDouble(PyObject *);
  #define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval)
+ 
+ /* Write repr(v) into the char buffer argument, followed by null byte.  The
+    buffer must be "big enough"; >= 100 is very safe.
+    PyFloat_AsReprString(buf, x) strives to print enough digits so that
+    PyFloat_FromString(buf) then reproduces x exactly. */
+ extern DL_IMPORT(void) PyFloat_AsReprString(char*, PyFloatObject *v);
+ 
+ /* Write str(v) into the char buffer argument, followed by null byte.  The
+    buffer must be "big enough"; >= 100 is very safe.  Note that it's
+    unusual to be able to get back the float you started with from
+    PyFloat_AsString's result -- use PyFloat_AsReprString() if you want to
+    preserve precision across conversions. */
+ extern DL_IMPORT(void) PyFloat_AsString(char*, PyFloatObject *v);
  
  #ifdef __cplusplus