From: Daniel Schoepe <daniel@schoepe.org>
To: musl@lists.openwall.com
Subject: printf doesn't respect locale
Date: Mon, 9 Sep 2019 17:31:01 +0100 [thread overview]
Message-ID: <CAPy=dbJVxof7_HRqw_cSFdz1AfJkCvYPnQ4iRk+OysbRu7huDw@mail.gmail.com> (raw)
Hi,
I think I found a discrepancy between musl's behavior and the POSIX standard:
According to the POSIX standard, the decimal separator used when using
printf to print floating point numbers should come from the locale
(https://pubs.opengroup.org/onlinepubs/9699919799/functions/fprintf.html):
"The radix character is defined in the current locale (category
LC_NUMERIC). In the POSIX locale, or in a locale where the radix
character is not defined, the radix character shall default to a
<period> ( '.' )."
However, it seems that in musl, a period is always used for printing
floating point numbers. For example, the following program prints
"12.0" instead of "12,0" (which is printed when using GNU libc):
#include <stdio.h>
#include <locale.h>
int main(int argc, char **argv) {
setlocale(LC_ALL, "DE_de");
printf("%f\n", 12.0f);
}
This was tested using the latest git checkout of musl
(a882841baf42e6a8b74cc33a239b84a9a79493db), compiled on Ubuntu 18.04
using the musl-gcc script. It looks like the usage of "." as a
separator is hardcoded in `fmt_fp`, for instance here:
https://git.musl-libc.org/cgit/musl/tree/src/stdio/vfprintf.c#n392
Best regards,
Daniel
next reply other threads:[~2019-09-09 16:31 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-09 16:31 Daniel Schoepe [this message]
2019-09-09 16:39 ` Daniel Schoepe
2019-09-09 16:51 ` Szabolcs Nagy
2019-09-09 17:55 ` Rich Felker
2019-09-09 17:54 ` Rich Felker
2019-09-10 16:00 ` Daniel Schoepe
2019-09-10 16:31 ` Szabolcs Nagy
2019-09-10 16:44 ` Tim Tassonis
2019-09-10 17:30 ` Rich Felker
2019-09-10 17:10 ` Daniel Schoepe
2019-09-10 17:33 ` Rich Felker
2019-09-10 18:43 ` Szabolcs Nagy
2019-09-10 21:55 ` A. Wilcox
2019-09-11 10:01 ` Szabolcs Nagy
2019-09-11 10:07 ` Jens Gustedt
2019-09-11 11:44 ` Rich Felker
2019-09-11 12:53 ` Jens Gustedt
2019-09-11 13:47 ` Rich Felker
2019-09-11 15:15 ` Jens Gustedt
2019-09-11 15:38 ` Rich Felker
2019-09-11 18:08 ` Jens Gustedt
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