[PATCH v3 00/15] lib/string_helpers: get rid of ugly *_escape_mem_ascii()

From: Andy Shevchenko
Date: Tue May 04 2021 - 14:08:31 EST

Get rid of ugly *_escape_mem_ascii() API since it's not flexible and
has the only single user. Provide better approach based on usage of the
string_escape_mem() with appropriate flags.

Test cases has been expanded accordingly to cover new functionality.

This is assumed to go either thru VFS or Andrew's tree. I don't expect
too many changes in string_helpers.

Changelog v3:
- dropped moving seq_escape() to the header due to a lot of complaints from
the (very) old code
- added seq_escape_str() inliner
- converted seq_escape() to use seq_escape_str() instead of seq_escape_mem()

Changelog v2:
- introduced seq_escape_mem() instead of poking seq_get_buf() (Al)
- to keep balance of seq_get_buf() usage, convert seq_escape() to use above
- added missed ESCAPE_APPEND flag in NFSv4 patch
- moved indentation patch closer to the beginning of the series
- reshuffled series to be in two groups: generic library extension
followed by seq_file updates

Andy Shevchenko (15):
lib/string_helpers: Switch to use BIT() macro
lib/string_helpers: Move ESCAPE_NP check inside 'else' branch in a
lib/string_helpers: Drop indentation level in string_escape_mem()
lib/string_helpers: Introduce ESCAPE_NA for escaping non-ASCII
lib/string_helpers: Introduce ESCAPE_NAP to escape non-ASCII and
lib/string_helpers: Allow to append additional characters to be
lib/test-string_helpers: Print flags in hexadecimal format
lib/test-string_helpers: Get rid of trailing comma in terminators
lib/test-string_helpers: Add test cases for new features
MAINTAINERS: Add myself as designated reviewer for generic string
seq_file: Introduce seq_escape_mem()
seq_file: Add seq_escape_str() as replica of string_escape_str()
seq_file: Convert seq_escape() to use seq_escape_str()
nfsd: Avoid non-flexible API in seq_quote_mem()
seq_file: Drop unused *_escape_mem_ascii()

fs/nfsd/nfs4state.c | 2 +-
fs/seq_file.c | 43 +++++----
include/linux/seq_file.h | 10 ++-
include/linux/string_helpers.h | 31 ++++---
lib/string_helpers.c | 102 ++++++++++++---------
lib/test-string_helpers.c | 157 +++++++++++++++++++++++++++++----
7 files changed, 264 insertions(+), 89 deletions(-)