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113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
/* stringlib: find/index implementation */
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#ifndef STRINGLIB_FIND_H
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#define STRINGLIB_FIND_H
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#ifndef STRINGLIB_FASTSEARCH_H
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#error must include "stringlib/fastsearch.h" 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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if (sub_len == 0) {
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if (str_len < 0)
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return -1;
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return offset;
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}
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pos = fastsearch(str, str_len, sub, sub_len, 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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/* XXX - create reversefastsearch helper! */
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if (sub_len == 0) {
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if (str_len < 0)
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return -1;
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return str_len + offset;
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} else {
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Py_ssize_t j, pos = -1;
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for (j = str_len - sub_len; j >= 0; --j)
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if (STRINGLIB_CMP(str+j, sub, sub_len) == 0) {
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pos = j + offset;
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break;
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}
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return pos;
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}
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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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if (start < 0)
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start += str_len;
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if (start < 0)
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start = 0;
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if (end > str_len)
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end = str_len;
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if (end < 0)
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end += str_len;
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if (end < 0)
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end = 0;
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return stringlib_find(
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str + start, end - start,
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sub, sub_len, start
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);
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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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if (start < 0)
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start += str_len;
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if (start < 0)
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start = 0;
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if (end > str_len)
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end = str_len;
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if (end < 0)
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end += str_len;
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if (end < 0)
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end = 0;
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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_STR
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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_STR */
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#endif /* STRINGLIB_FIND_H */
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/*
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Local variables:
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c-basic-offset: 4
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indent-tabs-mode: nil
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End:
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*/
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