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* lib/wchar.in.h (wcsstr): Consider REPLACE_WCSSTR.
* lib/wcs-two-way.h: New file, based on lib/str-two-way.h.
* lib/wcsstr-impl.h: If requested, use the two-way algorithm. New code
based on lib/strstr.c.
* m4/wcsstr.m4 (gl_FUNC_WCSSTR_SIMPLE): Renamed from gl_FUNC_WCSSTR.
(gl_FUNC_WCSSTR): New macro, based on gl_FUNC_STRSTR in m4/strstr.m4.
* m4/wchar_h.m4 (gl_WCHAR_H_DEFAULTS): Initialize REPLACE_WCSSTR.
* modules/wchar (Makefile.am): Substitute REPLACE_WCSSTR.
* modules/wcsstr-simple: New file, based on modules/wcsstr.
* modules/wcsstr (Description): Document that this module now provides
an efficient implementation.
(Files): Add lib/wcs-two-way.h.
(Depends-on): Depend on wcsstr-simple and the dependencies of the
two-way implementation.
(configure.ac): Use AC_LIBOBJ instead of a conditional. Don't invoke
gl_WCHAR_MODULE_INDICATOR.
(Makefile.am): Don't augment lib_SOURCES.
* tests/test-wcsstr.c: New file, based on tests/test-strstr.c.
* modules/wcsstr-tests: New file, based on modules/strstr-tests.
* doc/posix-functions/wcsstr.texi: Mention the worst-case complexity.
Mention the new 'wcsstr-simple' module.
* doc/posix-functions/strstr.texi: Fix typo.
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