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strstr, strcasestr: replace on platforms with broken memchr
* modules/strstr: Split into... * modules/strstr-simple: ...new module that does not care about performance, but does care about glibc bug. * m4/strstr.m4 (gl_FUNC_STRSTR): Split... (gl_FUNC_STRSTR_SIMPLE): ...into new macro, which replaces strstr if platform memchr is broken, per Debian bug 521737. * m4/strcasestr.m4 (gl_FUNC_STRCASESTR_SIMPLE): React to broken memchr. * m4/memchr.m4 (gl_FUNC_MEMCHR): Only expand once. * doc/posix-functions/strstr.texi (strstr): Document the fix. * doc/glibc-functions/strcasestr.texi (strcasestr): Likewise. * modules/mountlist (Depends-on): Add strstr-simple. * modules/gen-uni-tables (Depends-on): Likewise. * modules/argz (Depends-on): Add strstr. Signed-off-by: Eric Blake <ebb9@byu.net>
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@@ -9,7 +9,12 @@ or @code{strcasestr}:
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@itemize
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@item
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This function is missing on some platforms:
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AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x, mingw, BeOS.
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AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x,
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mingw, BeOS.
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@item
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This function can trigger memchr bugs on some platforms:
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glibc 2.10.
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@end itemize
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Portability problems fixed by Gnulib module @code{strcasestr}:
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