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reset errno before calling confstr - use confstr() doc to simplify checks afterwards

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Skip Montanaro 2006-04-18 00:49:49 +00:00
parent 429433b30b
commit dd527fcbcd
1 changed files with 9 additions and 7 deletions
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12
Modules/posixmodule.c
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@ -6812,17 +6812,19 @@ posix_confstr(PyObject *self, PyObject *args)
char buffer[64]; char buffer[64];
if (PyArg_ParseTuple(args, "O&:confstr", conv_confstr_confname, &name)) { if (PyArg_ParseTuple(args, "O&:confstr", conv_confstr_confname, &name)) {
int len = confstr(name, buffer, sizeof(buffer)); int len;
errno = 0; errno = 0;
if (len == 0) { len = confstr(name, buffer, sizeof(buffer));
if (errno != 0)
if (len == -1) {
posix_error(); posix_error();
else }
else if (len == 0) {
result = PyString_FromString(""); result = PyString_FromString("");
} }
else { else {
if (len >= sizeof(buffer)) { if ((unsigned int)len >= sizeof(buffer)) {
result = PyString_FromStringAndSize(NULL, len); result = PyString_FromStringAndSize(NULL, len);
if (result != NULL) if (result != NULL)
confstr(name, PyString_AS_STRING(result), len+1); confstr(name, PyString_AS_STRING(result), len+1);