On 22/12/2021 15:15, Alejandro Colomar wrote: > Reported-by: Adhemerval Zanella <adhemerval.zanella@xxxxxxxxxx> > Signed-off-by: Alejandro Colomar <alx.manpages@xxxxxxxxx> > Cc: libc-alpha@xxxxxxxxxxxxxx > Cc: Florian Weimer <fweimer@xxxxxxxxxx> > Cc: Michael Kerrisk <mtk.manpages@xxxxxxxxx> > --- > > Hi Adhemerval and Michael, > > First of all, happy new solar year! :) > > I added documentation for "%#m". Could you confirm I got the > glibc version correct, and also have a look at the changes? > > Thanks for the report! > > Cheers, > Alex > > man3/printf.3 | 23 ++++++++++++++++++++++- > 1 file changed, 22 insertions(+), 1 deletion(-) > > diff --git a/man3/printf.3 b/man3/printf.3 > index 4fa1f11f3..1e2bac4df 100644 > --- a/man3/printf.3 > +++ b/man3/printf.3 > @@ -301,6 +301,17 @@ and > .B G > conversions, trailing zeros are not removed from the result as they would > otherwise be. > +For > +.BR m , > +if > +.I errno > +contains a valid error code, > +the output of > +.I strerrorname_np(errno) > +is printed; > +otherwise, the value stored in > +.I errno > +is printed as a decimal number. > For other conversions, the result is undefined. > .TP > .B \&0 > @@ -853,7 +864,10 @@ any flags, a field width, or a precision. > .B m > (Glibc extension; supported by uClibc and musl.) > Print output of > -.IR strerror(errno) . > +.I strerror(errno) > +(or > +.I strerrorname_np(errno) > +in the alternate form). > No argument is required. > .TP > .B % Maybe add that strerrorname_np is only support on glibc, since on the same section it states that 'm' is a Glibc extension supported by uClibc and musl. The rest look ok, thanks. > @@ -974,6 +988,13 @@ and conversion characters \fBa\fP and \fBA\fP. > .PP > glibc 2.2 adds the conversion character \fBF\fP with C99 semantics, > and the flag character \fBI\fP. > +.PP > +glibc 2.35 gives a meaning to the alternate form > +.RB ( # ) > +of the > +.B m > +conversion specifier, that is > +.IR %#m . > .SH NOTES > Some programs imprudently rely on code such as the following > .PP
