From a5abe7b201779b0000f1e8ab522e5c6fc0c413bf Mon Sep 17 00:00:00 2001 From: Richard Fitzgerald Date: Mon, 28 Aug 2023 11:41:04 +0100 Subject: kunit: string-stream: Add option to make all lines end with newline Add an optional feature to string_stream that will append a newline to any added string that does not already end with a newline. The purpose of this is so that string_stream can be used to collect log lines. This is enabled/disabled by calling string_stream_set_append_newlines(). Signed-off-by: Richard Fitzgerald Reviewed-by: Rae Moar Reviewed-by: David Gow Signed-off-by: Shuah Khan --- lib/kunit/string-stream.c | 28 +++++++++++++++++++++------- lib/kunit/string-stream.h | 7 +++++++ 2 files changed, 28 insertions(+), 7 deletions(-) (limited to 'lib') diff --git a/lib/kunit/string-stream.c b/lib/kunit/string-stream.c index ed24d86af9f5..1dcf6513b692 100644 --- a/lib/kunit/string-stream.c +++ b/lib/kunit/string-stream.c @@ -44,32 +44,46 @@ int string_stream_vadd(struct string_stream *stream, va_list args) { struct string_stream_fragment *frag_container; - int len; + int buf_len, result_len; va_list args_for_counting; /* Make a copy because `vsnprintf` could change it */ va_copy(args_for_counting, args); /* Evaluate length of formatted string */ - len = vsnprintf(NULL, 0, fmt, args_for_counting); + buf_len = vsnprintf(NULL, 0, fmt, args_for_counting); va_end(args_for_counting); - if (len == 0) + if (buf_len == 0) return 0; + /* Reserve one extra for possible appended newline. */ + if (stream->append_newlines) + buf_len++; + /* Need space for null byte. */ - len++; + buf_len++; frag_container = alloc_string_stream_fragment(stream->test, - len, + buf_len, stream->gfp); if (IS_ERR(frag_container)) return PTR_ERR(frag_container); - len = vsnprintf(frag_container->fragment, len, fmt, args); + if (stream->append_newlines) { + /* Don't include reserved newline byte in writeable length. */ + result_len = vsnprintf(frag_container->fragment, buf_len - 1, fmt, args); + + /* Append newline if necessary. */ + if (frag_container->fragment[result_len - 1] != '\n') + result_len = strlcat(frag_container->fragment, "\n", buf_len); + } else { + result_len = vsnprintf(frag_container->fragment, buf_len, fmt, args); + } + spin_lock(&stream->lock); - stream->length += len; + stream->length += result_len; list_add_tail(&frag_container->node, &stream->fragments); spin_unlock(&stream->lock); diff --git a/lib/kunit/string-stream.h b/lib/kunit/string-stream.h index b669f9a75a94..048930bf97f0 100644 --- a/lib/kunit/string-stream.h +++ b/lib/kunit/string-stream.h @@ -25,6 +25,7 @@ struct string_stream { spinlock_t lock; struct kunit *test; gfp_t gfp; + bool append_newlines; }; struct kunit; @@ -47,4 +48,10 @@ bool string_stream_is_empty(struct string_stream *stream); void string_stream_destroy(struct string_stream *stream); +static inline void string_stream_set_append_newlines(struct string_stream *stream, + bool append_newlines) +{ + stream->append_newlines = append_newlines; +} + #endif /* _KUNIT_STRING_STREAM_H */ -- cgit v1.2.3