[PATCH 1/3] shell: Fix "read -d ''" behavior

Denys Vlasenko vda.linux at googlemail.com
Fri Jul 31 16:43:27 UTC 2020


Applied, thanks!

On Mon, Jun 29, 2020 at 6:28 PM Christian Eggers <ceggers at arri.de> wrote:
>
> With bash's read builtin it is possible to read from a file (e.g.
> device-tree) until the first '\0' character:
>
> IFS= read -r -d '' VARIABLE < file
>
> In busybox ash the -d extension is also implemented, but checking the
> read character for '\0' has to be performed after comparing with the
> delimiter.
>
> Signed-off-by: Christian Eggers <ceggers at arri.de>
> ---
>  shell/shell_common.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/shell/shell_common.c b/shell/shell_common.c
> index 12c4a073c..42c4c9c97 100644
> --- a/shell/shell_common.c
> +++ b/shell/shell_common.c
> @@ -209,8 +209,6 @@ shell_builtin_read(struct builtin_read_params *params)
>                 }
>
>                 c = buffer[bufpos];
> -               if (c == '\0')
> -                       continue;
>                 if (!(read_flags & BUILTIN_READ_RAW)) {
>                         if (backslash) {
>                                 backslash = 0;
> @@ -225,6 +223,8 @@ shell_builtin_read(struct builtin_read_params *params)
>                 }
>                 if (c == delim) /* '\n' or -d CHAR */
>                         break;
> +               if (c == '\0')
> +                       continue;
>
>                 /* $IFS splitting. NOT done if we run "read"
>                  * without variable names (bash compat).
> --
> Christian Eggers
> Embedded software developer
>
> Arnold & Richter Cine Technik GmbH & Co. Betriebs KG
> Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRA 57918
> Persoenlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH
> Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRB 54477
> Geschaeftsfuehrer: Dr. Michael Neuhaeuser; Stephan Schenk; Walter Trauninger; Markus Zeiler
>
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