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https://github.com/jart/cosmopolitan.git
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d26d7ae0e4
Building o//third_party/python now takes 5 seconds on my PC This change works towards modifying Python to use runtime dispatching when appropriate. For example, when loading the magnums in the socket module, it's a good idea to check if the magnum is zero, because that means the local system platform doesn't support it.
120 lines
3.2 KiB
C++
120 lines
3.2 KiB
C++
/* clang-format off */
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/* stringlib: find/index implementation */
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#ifndef STRINGLIB_FASTSEARCH_H
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#error must include fastsearch.inc before including this module
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#endif
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Py_LOCAL_INLINE(Py_ssize_t)
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STRINGLIB(find)(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
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const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
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Py_ssize_t offset)
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{
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Py_ssize_t pos;
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assert(str_len >= 0);
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if (sub_len == 0)
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return offset;
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pos = FASTSEARCH(str, str_len, sub, sub_len, -1, FAST_SEARCH);
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if (pos >= 0)
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pos += offset;
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return pos;
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}
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Py_LOCAL_INLINE(Py_ssize_t)
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STRINGLIB(rfind)(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
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const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
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Py_ssize_t offset)
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{
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Py_ssize_t pos;
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assert(str_len >= 0);
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if (sub_len == 0)
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return str_len + offset;
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pos = FASTSEARCH(str, str_len, sub, sub_len, -1, FAST_RSEARCH);
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if (pos >= 0)
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pos += offset;
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return pos;
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}
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Py_LOCAL_INLINE(Py_ssize_t)
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STRINGLIB(find_slice)(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
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const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
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Py_ssize_t start, Py_ssize_t end)
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{
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return STRINGLIB(find)(str + start, end - start, sub, sub_len, start);
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}
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Py_LOCAL_INLINE(Py_ssize_t)
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STRINGLIB(rfind_slice)(const STRINGLIB_CHAR* str, Py_ssize_t str_len,
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const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
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Py_ssize_t start, Py_ssize_t end)
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{
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return STRINGLIB(rfind)(str + start, end - start, sub, sub_len, start);
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}
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#ifdef STRINGLIB_WANT_CONTAINS_OBJ
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Py_LOCAL_INLINE(int)
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STRINGLIB(contains_obj)(PyObject* str, PyObject* sub)
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{
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return STRINGLIB(find)(
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STRINGLIB_STR(str), STRINGLIB_LEN(str),
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STRINGLIB_STR(sub), STRINGLIB_LEN(sub), 0
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) != -1;
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}
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#endif /* STRINGLIB_WANT_CONTAINS_OBJ */
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/*
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This function is a helper for the "find" family (find, rfind, index,
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rindex) and for count, startswith and endswith, because they all have
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the same behaviour for the arguments.
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It does not touch the variables received until it knows everything
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is ok.
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*/
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#define FORMAT_BUFFER_SIZE 50
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Py_LOCAL_INLINE(int)
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STRINGLIB(parse_args_finds)(const char * function_name, PyObject *args,
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PyObject **subobj,
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Py_ssize_t *start, Py_ssize_t *end)
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{
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PyObject *tmp_subobj;
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Py_ssize_t tmp_start = 0;
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Py_ssize_t tmp_end = PY_SSIZE_T_MAX;
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PyObject *obj_start=Py_None, *obj_end=Py_None;
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char format[FORMAT_BUFFER_SIZE] = "O|OO:";
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size_t len = strlen(format);
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strncpy(format + len, function_name, FORMAT_BUFFER_SIZE - len - 1);
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format[FORMAT_BUFFER_SIZE - 1] = '\0';
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if (!PyArg_ParseTuple(args, format, &tmp_subobj, &obj_start, &obj_end))
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return 0;
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/* To support None in "start" and "end" arguments, meaning
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the same as if they were not passed.
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*/
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if (obj_start != Py_None)
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if (!_PyEval_SliceIndex(obj_start, &tmp_start))
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return 0;
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if (obj_end != Py_None)
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if (!_PyEval_SliceIndex(obj_end, &tmp_end))
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return 0;
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*start = tmp_start;
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*end = tmp_end;
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*subobj = tmp_subobj;
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return 1;
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}
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#undef FORMAT_BUFFER_SIZE
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