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2019-05-21treewide: Add SPDX license identifier - Makefile/KconfigThomas Gleixner
Add SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any form These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-12unicode: update to Unicode 12.1.0 finalTheodore Ts'o
Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: Gabriel Krisman Bertazi <krisman@collabora.com>
2019-05-12unicode: add missing check for an error return from utf8lookup()Theodore Ts'o
Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: Gabriel Krisman Bertazi <krisman@collabora.com>
2019-04-28unicode: refactor the rule for regenerating utf8data.hMasahiro Yamada
scripts/mkutf8data is used only when regenerating utf8data.h, which never happens in the normal kernel build. However, it is irrespectively built if CONFIG_UNICODE is enabled. Moreover, there is no good reason for it to reside in the scripts/ directory since it is only used in fs/unicode/. Hence, move it from scripts/ to fs/unicode/. In some cases, we bypass build artifacts in the normal build. The conventional way to do so is to surround the code with ifdef REGENERATE_*. For example, - 7373f4f83c71 ("kbuild: add implicit rules for parser generation") - 6aaf49b495b4 ("crypto: arm,arm64 - Fix random regeneration of S_shipped") I rewrote the rule in a more kbuild'ish style. In the normal build, utf8data.h is just shipped from the check-in file. $ make [ snip ] SHIPPED fs/unicode/utf8data.h CC fs/unicode/utf8-norm.o CC fs/unicode/utf8-core.o CC fs/unicode/utf8-selftest.o AR fs/unicode/built-in.a If you want to generate utf8data.h based on UCD, put *.txt files into fs/unicode/, then pass REGENERATE_UTF8DATA=1 from the command line. The mkutf8data tool will be automatically compiled to generate the utf8data.h from the *.txt files. $ make REGENERATE_UTF8DATA=1 [ snip ] HOSTCC fs/unicode/mkutf8data GEN fs/unicode/utf8data.h CC fs/unicode/utf8-norm.o CC fs/unicode/utf8-core.o CC fs/unicode/utf8-selftest.o AR fs/unicode/built-in.a I renamed the check-in utf8data.h to utf8data.h_shipped so that this will work for the out-of-tree build. You can update it based on the latest UCD like this: $ make REGENERATE_UTF8DATA=1 fs/unicode/ $ cp fs/unicode/utf8data.h fs/unicode/utf8data.h_shipped Also, I added entries to .gitignore and dontdiff. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2019-04-25unicode: update unicode database unicode version 12.1.0Gabriel Krisman Bertazi
Regenerate utf8data.h based on the latest UCD files and run tests against the latest version. Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2019-04-25unicode: introduce test module for normalized utf8 implementationGabriel Krisman Bertazi
This implements a in-kernel sanity test module for the utf8 normalization core. At probe time, it will run basic sequences through the utf8n core, to identify problems will equivalent sequences and normalization/casefold code. This is supposed to be useful for regression testing when adding support for a new version of utf8 to linux. Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2019-04-25unicode: implement higher level API for string handlingGabriel Krisman Bertazi
This patch integrates the utf8n patches with some higher level API to perform UTF-8 string comparison, normalization and casefolding operations. Implemented is a variation of NFD, and casefold is performed by doing full casefold on top of NFD. These algorithms are based on the core implemented by Olaf Weber from SGI. Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2019-04-25unicode: reduce the size of utf8data[]Olaf Weber
Remove the Hangul decompositions from the utf8data trie, and do algorithmic decomposition to calculate them on the fly. To store the decomposition the caller of utf8lookup()/utf8nlookup() must provide a 12-byte buffer, which is used to synthesize a leaf with the decomposition. This significantly reduces the size of the utf8data[] array. Changes made by Gabriel: Rebase to mainline Fix checkpatch errors Extract robustness fixes and merge back to original mkutf8data.c patch Regenerate utf8data.h Signed-off-by: Olaf Weber <olaf@sgi.com> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2019-04-25unicode: introduce code for UTF-8 normalizationOlaf Weber
Supporting functions for UTF-8 normalization are in utf8norm.c with the header utf8norm.h. Two normalization forms are supported: nfdi and nfdicf. nfdi: - Apply unicode normalization form NFD. - Remove any Default_Ignorable_Code_Point. nfdicf: - Apply unicode normalization form NFD. - Remove any Default_Ignorable_Code_Point. - Apply a full casefold (C + F). For the purposes of the code, a string is valid UTF-8 if: - The values encoded are 0x1..0x10FFFF. - The surrogate codepoints 0xD800..0xDFFFF are not encoded. - The shortest possible encoding is used for all values. The supporting functions work on null-terminated strings (utf8 prefix) and on length-limited strings (utf8n prefix). From the original SGI patch and for conformity with coding standards, the utf8data_t typedef was dropped, since it was just masking the struct keyword. On other occasions, namely utf8leaf_t and utf8trie_t, I decided to keep it, since they are simple pointers to memory buffers, and using uchars here wouldn't provide any more meaningful information. From the original submission, we also converted from the compatibility form to canonical. Changes made by Gabriel: Rebase to Mainline Fix up checkpatch.pl warnings Drop typedefs move out of libxfs Convert from NFKD to NFD Signed-off-by: Olaf Weber <olaf@sgi.com> Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2019-04-25unicode: introduce UTF-8 character databaseGabriel Krisman Bertazi
The decomposition and casefolding of UTF-8 characters are described in a prefix tree in utf8data.h, which is a generate from the Unicode Character Database (UCD), published by the Unicode Consortium, and should not be edited by hand. The structures in utf8data.h are meant to be used for lookup operations by the unicode subsystem, when decoding a utf-8 string. mkutf8data.c is the source for a program that generates utf8data.h. It was written by Olaf Weber from SGI and originally proposed to be merged into Linux in 2014. The original proposal performed the compatibility decomposition, NFKD, but the current version was modified by me to do canonical decomposition, NFD, as suggested by the community. The changes from the original submission are: * Rebase to mainline. * Fix out-of-tree-build. * Update makefile to build 11.0.0 ucd files. * drop references to xfs. * Convert NFKD to NFD. * Merge back robustness fixes from original patch. Requested by Dave Chinner. The original submission is archived at: <https://linux-xfs.oss.sgi.narkive.com/Xx10wjVY/rfc-unicode-utf-8-support-for-xfs> The utf8data.h file can be regenerated using the instructions in fs/unicode/README.utf8data. - Notes on the update from 8.0.0 to 11.0: The structure of the ucd files and special cases have not experienced any changes between versions 8.0.0 and 11.0.0. 8.0.0 saw the addition of Cherokee LC characters, which is an interesting case for case-folding. The update is accompanied by new tests on the test_ucd module to catch specific cases. No changes to mkutf8data script were required for the updates. Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk> Signed-off-by: Theodore Ts'o <tytso@mit.edu>