[ping][PATCH 0/3] Guarantee first pushback in ungetc and ungetwc

[Siddhesh Poyarekar]

Ping!

On 2024-11-08 12:14, Siddhesh Poyarekar wrote:
> The C standard requires the first pushback after read operations to
> succeed for ungetc and ungetwc.  Use a single-char buffer in the FILE
> struct to guarantee this, so that the calls are not subject to a malloc
> failure.
> 
> Tested on x86_64.
> 
> Siddhesh Poyarekar (3):
>    libio: make _IO_least_marker static
>    ungetc: Guarantee single char pushback
>    ungetwc: Guarantee single char pushback
> 
>   libio/Makefile                  |  1 +
>   libio/bits/types/struct_FILE.h  |  3 +-
>   libio/fileops.c                 | 21 +++-----
>   libio/genops.c                  | 35 ++++++------
>   libio/libio.h                   |  1 +
>   libio/tst-ungetwc-nomem.c       | 94 +++++++++++++++++++++++++++++++++
>   libio/wfileops.c                | 28 +++-------
>   libio/wgenops.c                 | 29 +++++-----
>   stdio-common/Makefile           |  1 +
>   stdio-common/tst-ungetc-nomem.c | 94 +++++++++++++++++++++++++++++++++
>   10 files changed, 240 insertions(+), 67 deletions(-)
>   create mode 100644 libio/tst-ungetwc-nomem.c
>   create mode 100644 stdio-common/tst-ungetc-nomem.c
>