gnulib/doc/c-strcasecmp.texi

@c Documentation of gnulib module 'c-strcasecmp'.

@c Copyright (C) 2008--2025 Free Software Foundation, Inc.

@c Permission is granted to copy, distribute and/or modify this document
@c under the terms of the GNU Free Documentation License, Version 1.3 or
@c any later version published by the Free Software Foundation; with no
@c Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.  A
@c copy of the license is at <https://www.gnu.org/licenses/fdl-1.3.en.html>.

@mindex c-strcasecmp
The @code{c-strcasecmp} module contains a case-insensitive string comparison
function operating on single-byte character strings, like the functions in
@code{<strings.h>}, that operate as if the locale encoding was ASCII.
(The "C" locale on many systems has the locale encoding "ASCII".)

The function is:
@smallexample
extern int c_strcasecmp (const char *s1, const char *s2);
@end smallexample

For case conversion here, only ASCII characters are considered to be
upper case or lower case.

Note: The function @code{strcasecmp} from @code{<strings.h>}
supports only unibyte locales;
@mindex mbscasecmp
for multibyte locales,
you need the function @code{mbscasecmp}.