strstr
======

POSIX specification:
 https://pubs.opengroup.org/onlinepubs/9699919799/functions/strstr.html

Gnulib module: strstr or strstr-simple

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

  * 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 strstr:

  * This function has quadratic instead of linear worst-case complexity on some platforms: glibc 2.8, macOS 12.5, FreeBSD 11.4, NetBSD 9.0, OpenBSD 6.1, AIX 7.2, HP-UX 11, IRIX 6.5, Solaris 11.4, Cygwin 1.5.x, mingw, MSVC 14.

Portability problems not fixed by Gnulib:

  * This function cannot work correctly on character strings in most multibyte locales.  Gnulib provides an alternative function mbsstr that works on character strings in all locales.