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13.71.11 strcasestr

LSB specification:
https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib-strcasestr.html

Documentation:

• https://www.gnu.org/software/libc/manual/html_node/Search-Functions.html,
• man strcasestr.

Gnulib module: strcasestr or strcasestr-simple

Portability problems fixed by either Gnulib module strcasestr-simple or strcasestr:

• This function is missing on some platforms: AIX 7.2, HP-UX 11, Solaris 10, Cygwin 1.5.x, mingw, MSVC 14.
• This function can trigger memchr bugs on some platforms: glibc 2.10.
• This function can trigger false positives for long periodic needles on some platforms: glibc 2.12, Cygwin 1.7.7.
• This function may fail to find matches on some platforms: glibc 2.28.

Portability problems fixed by Gnulib module strcasestr:

• This function has quadratic instead of linear worst-case complexity on some platforms: glibc 2.8, musl libc 1.2.3, macOS 14, FreeBSD 13.1, NetBSD 10.0, OpenBSD 7.2, Solaris 11.4.

Portability problems not fixed by Gnulib: