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In text I/O, optimize scanning for new lines with 1-byte unicode chars

This commit is contained in:
Antoine Pitrou 2011-11-13 03:53:42 +01:00
parent f364e7b598
commit c28e2e53ba
1 changed files with 20 additions and 12 deletions
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32
Modules/_io/textio.c
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@ -365,19 +365,23 @@ _PyIncrementalNewlineDecoder_decode(PyObject *_self,
*/
if (seennl == 0 &&
memchr(in_str, '\n', kind * len) != NULL) {
Py_ssize_t i = 0;
for (;;) {
Py_UCS4 c;
/* Fast loop for non-control characters */
while (PyUnicode_READ(kind, in_str, i) > '\n')
i++;
c = PyUnicode_READ(kind, in_str, i++);
if (c == '\n') {
seennl |= SEEN_LF;
break;
if (kind == PyUnicode_1BYTE_KIND)
seennl |= SEEN_LF;
else {
Py_ssize_t i = 0;
for (;;) {
Py_UCS4 c;
/* Fast loop for non-control characters */
while (PyUnicode_READ(kind, in_str, i) > '\n')
i++;
c = PyUnicode_READ(kind, in_str, i++);
if (c == '\n') {
seennl |= SEEN_LF;
break;
}
if (i >= len)
break;
}
if (i >= len)
break;
}
}
/* Finished: we have scanned for newlines, and none of them
@ -1597,6 +1601,10 @@ textiowrapper_read(textio *self, PyObject *args)
static char *
find_control_char(int kind, char *s, char *end, Py_UCS4 ch)
{
if (kind == PyUnicode_1BYTE_KIND) {
assert(ch < 256);
return (char *) memchr((void *) s, (char) ch, end - s);
}
for (;;) {
while (PyUnicode_READ(kind, s, 0) > ch)
s += kind;