glibc strftime extensions

glibc strftime extensions

[Evan Shaw]

Hi,

glibc extends strftime as documented in [1]. Might musl implement some
or all of these at some point, or have they been deliberately omitted?

OS X also partially implements the same extensions[2], and the glibc
docs mention that "a few other systems provide similar features" but
doesn't get specific. I haven't taken the time to look at other libc
implementations yet.

(Please CC me in any replies as I am not subscribed to this list.)

- Evan

[1] http://man7.org/linux/man-pages/man3/strftime.3.html#NOTES
[2] https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man3/strftime.3.html

Re: glibc strftime extensions

[Alexander Monakov]

On Tue, 29 Mar 2016, Evan Shaw wrote:
> glibc extends strftime as documented in [1]. Might musl implement some
> or all of these at some point, or have they been deliberately omitted?
> 
> OS X also partially implements the same extensions[2], and the glibc
> docs mention that "a few other systems provide similar features" but
> doesn't get specific. I haven't taken the time to look at other libc
> implementations yet.

In such cases it's usually useful to check what BSD libc implementations do;
for example, FreeBSD documents provision of '-', '_', '0' flags:
https://www.freebsd.org/cgi/man.cgi?query=strftime

Thus I think providing -_0 in musl makes sense to consider, given significant
precedent and low implementation cost.

Alexander