bug#11786: Use c_strcasecmp for portable ASCII case-insensitive comparison

[Dmitry Antipov]

On 06/26/2012 08:02 PM, Eli Zaretskii wrote:

> First, until revision 108735, committed yesterday by Dmitry, we didn't
> use strcasecmp or strncasecmp (except in the NS port, which looks like
> an oversight).  We used xtrcasecmp, whose only dependence on the
> locale is the tolower function/macro.  Then Dmitry replaced
> xstrcasecmp with strcasecmp for those platforms that have it (which I
> think means all the supported platforms), for reasons that AFAIK were
> never discussed.  Why was that done?

It was an attempt to get rid from the zoo of strcase(n)cmp implementations
(one in etags.c, one in lwlib.c and next one in xfaces.c). I assumed that
these library functions, if available, should work correctly regardless
from the locale on any non-ancient system. If that is not true, gnulib
module may be a workaround.

Dmitry