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kunit: string-stream: Don't create a fragment for empty strings 

If the result of the formatted string is an empty string just return
instead of creating an empty fragment.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: Rae Moar <rmoar@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Richard Fitzgerald 2023-08-28 11:41:02 +01:00 committed by Shuah Khan
parent ce9ecca023
commit 5c54c9ebb1
1 changed files with 8 additions and 2 deletions
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10
lib/kunit/string-stream.c
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@ -50,11 +50,17 @@ int string_stream_vadd(struct string_stream *stream,
/* Make a copy because `vsnprintf` could change it */
va_copy(args_for_counting, args);
/* Need space for null byte. */
len = vsnprintf(NULL, 0, fmt, args_for_counting) + 1;
/* Evaluate length of formatted string */
len = vsnprintf(NULL, 0, fmt, args_for_counting);
va_end(args_for_counting);
if (len == 0)
return 0;
/* Need space for null byte. */
len++;
frag_container = alloc_string_stream_fragment(stream->test,
len,
stream->gfp);