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Setlocale 7 February 2020 In my C program I wanted to be able to handle international characters in UTF-8. So I used standard library functions like mblen and mbtowc , that I had discovered in talk notes by Ingo Schwarze: “ Why and how you ought to Keep multibyte character support simple, EuroBSDCon, Beograd, September 25, 2016 ”. (Nice Canadian mountain, campground and rivulet photos, by the way.) But whatever I tried, they didn't work. No multibyte characters, put in a test string in UTF-8 (the default encoding of Linux Mint) were ever recognised. When I ran locale in the born again shell bash , I got this: LANG=en_US.UTF-8 LANGUAGE=en_US LC_CTYPE="en_US.UTF-8" LC_NUMERIC=en_US.UTF-8 LC_TIME=en_US.UTF-8 LC_COLLATE="en_US.UTF-8" LC_MONETARY=en_US.UTF-8 LC_MESSAGES="en_US.UTF-8" LC_PAPER=en_US.UTF-8 LC_NAME=en_US.UTF-8 LC_ADDRESS=en_US.UTF-8 LC_TELEPHONE=en_US.UTF-8 LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=en_US.UTF-8 LC_ALL= I expected my little test program to inherit that, and be aware of UTF-8. Because from past experiences with the bourne shell sh , I remembered that environment variables are not always inherited by subprocesses by default, I even exported them. Still to no avail. Notable fact: standard library ( stlib.h ) macro MB_CUR_MAX stubbornly kept evaluating to 1. Never more. Always read man pages, of course. I had, and did again. I took me a long time to finally find the solution. If you run: man locale it defaults to man 1 locale . As usual: first one found is shown. But that page isn't very informative. What you actually should read is: man 7 locale . There it says: “ The header declares data types, functions and macros which are useful in this task. The functions it declares are setlocale(3) to set the current locale, ” [...] man 3 setlocale : “ If locale is an empty string, "", each part of the locale that should be modified is set according to the environment variables. [...] On startup of the main program, the portable "C" locale is selected as default. A program may be made portable to all locales by calling: setlocale(LC_ALL, ""); ” That helped. Now it works. I thought I should share. Copyright © 2020 by R. Harmsen all rights reserved. Software reviews and tips This site's front door Colours: Neutral Weird No preference Reload screen ... - [detail] - [similar]
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