git: printf(3)/scanf(3): Make ll and L length modifiers equivalent.

Sascha Wildner swildner at
Mon Mar 21 01:30:33 PDT 2022

commit 839f7d6207d1654b664a46f2905d559773779bc3
Author: Sascha Wildner <saw at>
Date:   Mon Mar 21 09:29:17 2022 +0100

    printf(3)/scanf(3): Make ll and L length modifiers equivalent.
    POSIX defines L only for floating point numbers (long double) and ll only
    for integer numbers (long long), leaving for example %Ld or %llg
    undefined. GCC allows these non-portable combinations as an extension,
    i.e. -Wformat will not warn about them unless -pedantic is passed.
    To avoid surprises with Linux code, go with glibc and make ll and L
    equivalent. For base code, we still prefer going with the standard, of
    Interestingly, the alternate printf(3) implementation in libc (enabled
    by defining USE_XPRINTF in the environment) already treats them equally.
    In-discussion-with: zrj

Summary of changes:
 lib/libc/stdio/printf.3      | 24 +++++++++++++++++++++---
 lib/libc/stdio/printflocal.h |  4 ++++
 lib/libc/stdio/scanf.3       | 43 ++++++++++++++++++++++++++++++++++++++-----
 lib/libc/stdio/vfscanf.c     |  5 +++++
 lib/libc/stdio/vfwscanf.c    |  5 +++++
 lib/libc/stdio/wprintf.3     | 24 +++++++++++++++++++++---
 lib/libc/stdio/wscanf.3      | 43 ++++++++++++++++++++++++++++++++++++++-----
 7 files changed, 132 insertions(+), 16 deletions(-)

DragonFly BSD source repository

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