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References: <etPan.5aa22836.70671812.159ee@zdharma.org> <19380.1520696454@thecus>
From: Bart Schaefer <schaefer@brasslantern.com>
Date: Sun, 11 Mar 2018 00:33:46 -0800
Message-ID: <CAH+w=7Z0_O2Fke5j2M3z28vfJGREyNuEcf1Fybjuh-nHRxWHYg@mail.gmail.com>
Subject: Re: Performance tests of quoting and dequoting, printf -v turned out slow
To: Oliver Kiddle <okiddle@yahoo.co.uk>
Cc: "zsh-workers@zsh.org" <zsh-workers@zsh.org>
Content-Type: text/plain; charset="UTF-8"

On Sat, Mar 10, 2018 at 7:40 AM, Oliver Kiddle <okiddle@yahoo.co.uk> wrote:
>
> What may affect things is whether or not zsh was built to use
> open_memstream from libc. FreeBSD and GNU libc have open_memstream.

Indeed:

schaefer[556] Src/zsh -f
% qflag() {
    local OUTPUT
    repeat 10000; do
        OUTPUT="${(q)INPUT}"
    done
}
% typeset -F SECONDS=0; qflag; print $SECONDS
0.0282280000
% prtf() {
    local OUTPUT
    repeat 10000; do
        printf -v OUTPUT '%q ' "$INPUT"
    done
}
% typeset -F SECONDS=0; prtf; print $SECONDS
3.8363050000
%

schaefer[557] grep -i memstream config.h
/* Define to 1 if you have the `open_memstream' function. */
/* #undef HAVE_OPEN_MEMSTREAM */