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STRCOLL(3) Library Functions Manual STRCOLL(3)

strcoll, strcoll_l —
compare strings according to current collation

#include <string.h>

int
strcoll(const char *s1, const char *s2);

int
strcoll_l(const char *s1, const char *s2, locale_t locale);

The strcoll() and strcoll_l() functions lexicographically compare the NUL-terminated strings s1 and s2 according to the current locale collation and return an integer greater than, equal to, or less than 0, according to whether s1 is greater than, equal to, or less than s2.

On OpenBSD, they have the same effect as strcmp(3), and the global locale, the thread-specific locale, and the locale argument are ignored. On other operating systems, results may depend on the LC_CTYPE and LC_COLLATE locale categories set with setlocale(3), uselocale(3), or newlocale(3).

newlocale(3), setlocale(3), strcmp(3), strxfrm(3), wcscoll(3)

The strcoll() function conforms to ANSI X3.159-1989 (“ANSI C89”), and strcoll_l() to IEEE Std 1003.1-2008 (“POSIX.1”).

The strcoll() function has been available since 4.3BSD-Reno, and strcoll_l() since OpenBSD 6.2.
January 18, 2019 OpenBSD-current