Date: Sat, 3 Nov 2001 14:35:15 +0000 From: Giorgos Keramidas <charon@labs.gr> To: Peter Pentchev <roam@ringlet.net> Cc: Dag-Erling Smorgrav <des@ofug.org>, Joe Abley <jabley@automagic.org>, arch@FreeBSD.ORG Subject: Re: POSIX character class support for 1Tawk Message-ID: <20011103143515.D4464@hades.hell.gr> In-Reply-To: <20011103145608.B76275@straylight.oblivion.bg> References: <xzpu1wca91d.fsf@flood.ping.uio.no> <20011102233831.L25226@buffoon.automagic.org> <xzphesca0xv.fsf@flood.ping.uio.no> <20011103012226.Q25226@buffoon.automagic.org> <xzpvggse5j4.fsf@flood.ping.uio.no> <20011103145608.B76275@straylight.oblivion.bg>
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On Sat, Nov 03, 2001 at 02:56:08PM +0200, Peter Pentchev wrote: > On Sat, Nov 03, 2001 at 07:23:59AM +0100, Dag-Erling Smorgrav wrote: > > Joe Abley <jabley@automagic.org> writes: > > > Our isalpha() and friends are locale-sensitive, I think. > > > > Only if the caller has previously called setlocale(). > > So what's the problem in calling setlocale(LC_ALL, "") > early in main() or something, as so many other utilities in > our base system already do? Unfortunately enough, it's not that simple. You'd have to check for all the possible LC_xxx environment variables. The small program below shows what can happen if you use setlocale() with NULL instead of the correct value. #include <ctype.h> #include <locale.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #define GREEK_ALPHA 0xe1 int main (void) { char *lc; setlocale(LC_ALL, NULL); printf("Using NULL: %s\n", isalpha(GREEK_ALPHA) ? "true" : "false"); if ((lc = getenv("LC_ALL")) == NULL) { fprintf(stderr, "LC_ALL is not defined\n"); exit(1); } setlocale(LC_ALL, lc); printf("Using getenv(): %s\n", isalpha(GREEK_ALPHA) ? "true" : "false"); return 0; } Which gives the output shown below: $ cc -Wall -o blah blah.c $ ./blah Using NULL: false LC_ALL is not defined $ env LC_LANG=el_GR LC_ALL=el_GR.ISO8859-7 ./blah Using NULL: false Using getenv(): true In the second case, of having the proper locale setup in the environment, only when getenv() is used to retrieve the proper value for setlocale() the GREEK_ALPHA character is recognized from isalpha() :/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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