[edk2-devel] [edk] [PATCH] ShellPkg/edit: allow non-ASCII characters in edit
Laszlo Ersek
lersek at redhat.com
Wed Nov 4 17:23:57 UTC 2020
Hi Heinrich,
On 11/03/20 00:11, Heinrich Schuchardt wrote:
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2339
>
> Currently it is not possible to add letters outside the range
> U+0020 - U+007F to a file using the edit command.
>
> In Unicode the following are control characters:
>
> * U+0000—U+001F (C0 controls)
> * U+007F (DEL)
> * U+0080—U+009F (C1 controls).
>
> For reference see:
>
> * https://unicode.org/charts/PDF/U0000.pdf
> * https://unicode.org/charts/PDF/U0080.pdf
>
> So the characters we should exclude from the file buffer are:
> U+0000 - U+001f, U+007f - U009F
>
> Allow all other characters as input to the file buffer in Unicode mode.
> Allow only ASCII characters as input in ASCII mode.
>
> When saving a file in ASCII mode replace non-ASCII characters by a question
> mark ('?').
>
> For editing texts with double width characters (e.g. Japanese) further
> adjustments will be needed.
>
> Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
> ---
> Resent.
> Original message https://edk2.groups.io/g/devel/message/51205
thank you for the repost; the patch now looks well-formed to me!
Thanks
Laszlo
> ---
> .../Edit/FileBuffer.c | 21 +++++++++++++++----
> 1 file changed, 17 insertions(+), 4 deletions(-)
>
> diff --git a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.c b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.c
> index 5659ec981054..3923b83670fa 100644
> --- a/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.c
> +++ b/ShellPkg/Library/UefiShellDebug1CommandsLib/Edit/FileBuffer.c
> @@ -1360,6 +1360,8 @@ GetNewLine (
> /**
> Change a Unicode string to an ASCII string.
>
> + Non-ASCII characters are replaced by '?'.
> +
> @param[in] UStr The Unicode string.
> @param[in] Length The maximum size of AStr.
> @param[out] AStr ASCII string to pass out.
> @@ -1378,8 +1380,12 @@ UnicodeToAscii (
> //
> // just buffer copy, not character copy
> //
> - for (Index = 0; Index < Length; Index++) {
> - *AStr++ = (CHAR8) *UStr++;
> + for (Index = 0; Index < Length; Index++, UStr++) {
> + if (*UStr < 0x80) {
> + *AStr++ = (CHAR8) *UStr;
> + } else {
> + *AStr++ = '?';
> + }
> }
>
> return Index;
> @@ -2154,9 +2160,16 @@ FileBufferDoCharInput (
>
> default:
> //
> - // DEAL WITH ASCII CHAR, filter out thing like ctrl+f
> + // Do not add Unicode control characters to the file buffer:
> //
> - if (Char > 127 || Char < 32) {
> + // * U+0000-U+001f (C0 controls)
> + // * U+007f (DEL)
> + // * U+0080-U+009f (C1 controls)
> + //
> + // Do not add non-ASCII characters in ASCII mode.
> + //
> + if (Char < 0x20 || (Char >= 0x7f &&
> + (Char <= 0x9f || FileBuffer.FileType == FileTypeAscii))) {
> Status = StatusBarSetStatusString (L"Unknown Command");
> } else {
> Status = FileBufferAddChar (Char);
> --
> 2.28.0
>
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