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Added more comments to the new structseq repr code and implemented several of Neal's suggestions.

This commit is contained in:
Christian Heimes 2008-01-14 06:06:19 +00:00
parent c94e2b5c12
commit c3b2a4afe8
1 changed files with 36 additions and 17 deletions
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49
Objects/structseq.c
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@ -230,23 +230,37 @@ make_tuple(PyStructSequence *obj)
static PyObject * static PyObject *
structseq_repr(PyStructSequence *obj) structseq_repr(PyStructSequence *obj)
{ {
PyObject *tup, *val, *repr; /* buffer and type size were chosen well considered. */
PyTypeObject *typ = Py_TYPE(obj); #define REPR_BUFFER_SIZE 512
int i, len; #define TYPE_MAXSIZE 100
char buf[250+5]; /* "...)\0" */
char *cname, *crepr;
char *pbuf = buf;
char *endbuf = &buf[250];
strncpy(pbuf, typ->tp_name, 50); PyObject *tup;
pbuf += strlen(typ->tp_name) > 50 ? 50 : strlen(typ->tp_name); PyTypeObject *typ = Py_TYPE(obj);
*pbuf++ = '('; int i, removelast = 0;
Py_ssize_t len;
char buf[REPR_BUFFER_SIZE];
char *endofbuf, *pbuf = buf;
/* pointer to end of writeable buffer; safes space for "...)\0" */
endofbuf= &buf[REPR_BUFFER_SIZE-5];
if ((tup = make_tuple(obj)) == NULL) { if ((tup = make_tuple(obj)) == NULL) {
return NULL; return NULL;
} }
/* "typename(", limited to TYPE_MAXSIZE */
len = strlen(typ->tp_name) > TYPE_MAXSIZE ? TYPE_MAXSIZE :
strlen(typ->tp_name);
strncpy(pbuf, typ->tp_name, len);
pbuf += len;
*pbuf++ = '(';
for (i=0; i < VISIBLE_SIZE(obj); i++) { for (i=0; i < VISIBLE_SIZE(obj); i++) {
PyObject *val, *repr;
char *cname, *crepr;
cname = typ->tp_members[i].name; cname = typ->tp_members[i].name;
val = PyTuple_GetItem(tup, i); val = PyTuple_GetItem(tup, i);
if (cname == NULL || val == NULL) { if (cname == NULL || val == NULL) {
return NULL; return NULL;
@ -262,8 +276,10 @@ structseq_repr(PyStructSequence *obj)
Py_DECREF(repr); Py_DECREF(repr);
return NULL; return NULL;
} }
/* + 3: keep space for "=" and ", " */
len = strlen(cname) + strlen(crepr) + 3; len = strlen(cname) + strlen(crepr) + 3;
if ((pbuf+len) < endbuf) { if ((pbuf+len) <= endofbuf) {
strcpy(pbuf, cname); strcpy(pbuf, cname);
pbuf += strlen(cname); pbuf += strlen(cname);
*pbuf++ = '='; *pbuf++ = '=';
@ -271,23 +287,26 @@ structseq_repr(PyStructSequence *obj)
pbuf += strlen(crepr); pbuf += strlen(crepr);
*pbuf++ = ','; *pbuf++ = ',';
*pbuf++ = ' '; *pbuf++ = ' ';
removelast = 1;
Py_DECREF(repr); Py_DECREF(repr);
} }
else { else {
strcpy(pbuf, "..."); strcpy(pbuf, "...");
pbuf += 5; pbuf += 3;
removelast = 0;
Py_DECREF(repr); Py_DECREF(repr);
break; break;
} }
} }
Py_DECREF(tup); Py_DECREF(tup);
if (removelast) {
/* overwrite last ", " */
pbuf-=2; pbuf-=2;
}
*pbuf++ = ')'; *pbuf++ = ')';
*pbuf = '\0'; *pbuf = '\0';
repr = PyString_FromString(buf); return PyString_FromString(buf);
return repr;
} }
static PyObject * static PyObject *