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annotate doc/posix-functions/strstr.texi @ 11628:59047bad770e

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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>
author Eric Blake <ebb9@byu.net>
date Tue, 16 Jun 2009 06:14:05 -0600
parents c83dc7e8df57
children bb0ceefd22dc
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070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
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1 @node strstr
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2 @section @code{strstr}
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3 @findex strstr
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4
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c83dc7e8df57 Refer to new POSIX:2008 standard.
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5 POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/strstr.html}
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7 Gnulib module: strstr or strstr-simple
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8
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9 Portability problems fixed by either Gnulib module @code{strstr-simple}
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10 or @code{strstr}:
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11 @itemize
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12 @item
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13 This function can trigger memchr bugs on some platforms:
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14 glibc 2.10.
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15 @end itemize
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16
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17 Portability problems fixed by Gnulib @code{strstr}:
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18 @itemize
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19 @item
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20 This function has quadratic instead of linear worst-case complexity on some
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21 platforms:
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22 glibc 2.8, MacOS X 10.3, FreeBSD 6.2, NetBSD 3.0, OpenBSD 4.0, AIX
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23 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.5.x, mingw.
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24 @end itemize
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25
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26 Portability problems not fixed by Gnulib:
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27 @itemize
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28 @item
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29 This function cannot work correctly on character strings in most multibyte
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30 locales. Gnulib provides an alternative function @code{mbsstr} that works
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31 on character strings in all locales.
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32 @end itemize