Hi, our locale(1) implementation is intentionally simplistic and implements only a subset of this POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/locale.html However, one feature is missing that is actually useful and arguably also well-placed inside the locale(1) utility. If you want to know from within a C program which character encoding is actually being used (as opposed to which one the user requested), you can use the nl_langinfo(3) function. But i'm not aware of a possibiliy to ask the same from within a sh(1) program. POSIX says that "locale charmap" should answer that question. In the next release of textproc/groff, that feature of locale(1) will be used in the test suite, and it seems reasonable to do so. So, here is a very simple patch to support the "charmap" argument. Testing: $ export LC_CTYPE=en_US.UTF-8 $ locale LANG= LC_COLLATE="C" LC_CTYPE=en_US.UTF-8 LC_MONETARY="C" LC_NUMERIC="C" LC_TIME="C" LC_MESSAGES="C" LC_ALL= $ locale -a | wc 68 68 794 $ locale -m UTF-8 $ locale charmap UTF-8 $ LC_ALL=C locale charmap US-ASCII $ LC_ALL=POSIX locale charmap US-ASCII $ LC_ALL=NonSense locale charmap US-ASCII $ locale -x locale: unknown option -- x usage: locale [-a | -m | charmap] $ locale nonsense usage: locale [-a | -m | charmap] $ locale -am usage: locale [-a | -m | charmap] $ locale -a charmap usage: locale [-a | -m | charmap] $ locale -m charmap usage: locale [-a | -m | charmap] $ locale charmap nonsense usage: locale [-a | -m | charmap] OK? Ingo P.S. It would be trivial to also support the POSIX -k option, as in $ locale -k charmap charmap="UTF-8" but that doesn't actually feel useful and i'm not aware of anything that might want to use it, so KISS and let's proceed one step at a time. Supporting "name" arguments other than "charmap" would make little sense on OpenBSD, nor would the -c option. Index: locale.1 =================================================================== RCS file: /cvs/src/usr.bin/locale/locale.1,v retrieving revision 1.7 diff -u -p -r1.7 locale.1 --- locale.1 26 Oct 2016 01:00:27 -0000 1.7 +++ locale.1 16 Apr 2020 19:04:25 -0000 @@ -1,6 +1,6 @@ .\" $OpenBSD: locale.1,v 1.7 2016/10/26 01:00:27 schwarze Exp $ .\" -.\" Copyright 2016 Ingo Schwarze <schwa...@openbsd.org> +.\" Copyright 2016, 2020 Ingo Schwarze <schwa...@openbsd.org> .\" Copyright 2013 Stefan Sperling <s...@openbsd.org> .\" .\" Permission to use, copy, modify, and distribute this software for any @@ -23,7 +23,7 @@ .Nd character encoding and localization conventions .Sh SYNOPSIS .Nm locale -.Op Fl a | Fl m +.Op Fl a | Fl m | Cm charmap .Sh DESCRIPTION If the .Nm @@ -31,7 +31,7 @@ utility is invoked without any arguments configuration is shown. .Pp The options are as follows: -.Bl -tag -width Ds +.Bl -tag -width charmap .It Fl a Display a list of supported locales. .It Fl m @@ -39,6 +39,11 @@ Display a list of supported character en On .Ox , this always returns UTF-8 only. +.It Cm charmap +Display the currently selected character encoding. +On +.Ox , +this returns either US-ASCII or UTF-8. .El .Pp A locale is a set of environment variables telling programs which Index: locale.c =================================================================== RCS file: /cvs/src/usr.bin/locale/locale.c,v retrieving revision 1.12 diff -u -p -r1.12 locale.c --- locale.c 5 Feb 2016 12:59:12 -0000 1.12 +++ locale.c 16 Apr 2020 19:04:25 -0000 @@ -16,6 +16,7 @@ */ #include <err.h> +#include <langinfo.h> #include <locale.h> #include <stdio.h> #include <stdlib.h> @@ -169,7 +170,7 @@ show_locales(void) static void usage(void) { - fprintf(stderr, "usage: %s [-a | -m]\n", __progname); + fprintf(stderr, "usage: %s [-a | -m | charmap]\n", __progname); exit(1); } @@ -203,12 +204,16 @@ main(int argc, char *argv[]) argc -= optind; argv += optind; - if (argc != 0 || (aflag && mflag)) + if (aflag + mflag + argc > 1) usage(); else if (aflag) show_locales(); else if (mflag) printf("UTF-8\n"); + else if (strcmp(*argv, "charmap") == 0) + printf("%s\n", nl_langinfo(CODESET)); + else + usage(); return 0; }
