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| author | Bruno Haible <bruno@clisp.org> | 2023-03-27 15:41:30 +0200 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2023-03-27 15:41:30 +0200 |
| commit | 9411c5e467cf60f6295b9fed306029f341a0f24f (patch) | |
| tree | d004f4ae2ddab9e649df6df4c716aa982d6fe119 /doc | |
| parent | 5a9a1ea612598404bca0e4c5dbb9505ed36fd11d (diff) | |
| download | gnulib-9411c5e467cf60f6295b9fed306029f341a0f24f.tar.gz | |
wcsstr: Ensure worst-case linear execution time.
* 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.
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/posix-functions/strstr.texi | 2 | ||||
| -rw-r--r-- | doc/posix-functions/wcsstr.texi | 12 |
2 files changed, 11 insertions, 3 deletions
diff --git a/doc/posix-functions/strstr.texi b/doc/posix-functions/strstr.texi index 1b124a0e53..3a36cfdeed 100644 --- a/doc/posix-functions/strstr.texi +++ b/doc/posix-functions/strstr.texi @@ -21,7 +21,7 @@ This function may fail to find matches on some platforms: glibc 2.28. @end itemize -Portability problems fixed by Gnulib @code{strstr}: +Portability problems fixed by Gnulib module @code{strstr}: @itemize @item This function has quadratic instead of linear worst-case complexity on some diff --git a/doc/posix-functions/wcsstr.texi b/doc/posix-functions/wcsstr.texi index c5711d0821..e69a036658 100644 --- a/doc/posix-functions/wcsstr.texi +++ b/doc/posix-functions/wcsstr.texi @@ -4,15 +4,23 @@ POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/wcsstr.html} -Gnulib module: wcsstr +Gnulib module: wcsstr or wcsstr-simple -Portability problems fixed by Gnulib: +Portability problems fixed by either Gnulib module @code{wcsstr-simple} or @code{wcsstr}: @itemize @item This function is missing on some platforms: HP-UX 11.00. @end itemize +Portability problems fixed by Gnulib module @code{wcsstr}: +@itemize +@item +This function has quadratic instead of linear worst-case complexity on some +platforms: +glibc 2.37, macOS 12.5, FreeBSD 13.1, NetBSD 9.0, OpenBSD 7.2, AIX 7.2, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 2.9.0, mingw, MSVC 14. +@end itemize + Portability problems not fixed by Gnulib: @itemize @item |