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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /lib/kunit/string-stream.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | lib/kunit/string-stream.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/lib/kunit/string-stream.c b/lib/kunit/string-stream.c new file mode 100644 index 0000000000..cc32743c11 --- /dev/null +++ b/lib/kunit/string-stream.c @@ -0,0 +1,155 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * C++ stream style string builder used in KUnit for building messages. + * + * Copyright (C) 2019, Google LLC. + * Author: Brendan Higgins <brendanhiggins@google.com> + */ + +#include <kunit/test.h> +#include <linux/list.h> +#include <linux/slab.h> + +#include "string-stream.h" + + +static struct string_stream_fragment *alloc_string_stream_fragment( + struct kunit *test, int len, gfp_t gfp) +{ + struct string_stream_fragment *frag; + + frag = kunit_kzalloc(test, sizeof(*frag), gfp); + if (!frag) + return ERR_PTR(-ENOMEM); + + frag->fragment = kunit_kmalloc(test, len, gfp); + if (!frag->fragment) { + kunit_kfree(test, frag); + return ERR_PTR(-ENOMEM); + } + + return frag; +} + +static void string_stream_fragment_destroy(struct kunit *test, + struct string_stream_fragment *frag) +{ + list_del(&frag->node); + kunit_kfree(test, frag->fragment); + kunit_kfree(test, frag); +} + +int string_stream_vadd(struct string_stream *stream, + const char *fmt, + va_list args) +{ + struct string_stream_fragment *frag_container; + int len; + va_list args_for_counting; + + /* 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; + + va_end(args_for_counting); + + frag_container = alloc_string_stream_fragment(stream->test, + len, + stream->gfp); + if (IS_ERR(frag_container)) + return PTR_ERR(frag_container); + + len = vsnprintf(frag_container->fragment, len, fmt, args); + spin_lock(&stream->lock); + stream->length += len; + list_add_tail(&frag_container->node, &stream->fragments); + spin_unlock(&stream->lock); + + return 0; +} + +int string_stream_add(struct string_stream *stream, const char *fmt, ...) +{ + va_list args; + int result; + + va_start(args, fmt); + result = string_stream_vadd(stream, fmt, args); + va_end(args); + + return result; +} + +static void string_stream_clear(struct string_stream *stream) +{ + struct string_stream_fragment *frag_container, *frag_container_safe; + + spin_lock(&stream->lock); + list_for_each_entry_safe(frag_container, + frag_container_safe, + &stream->fragments, + node) { + string_stream_fragment_destroy(stream->test, frag_container); + } + stream->length = 0; + spin_unlock(&stream->lock); +} + +char *string_stream_get_string(struct string_stream *stream) +{ + struct string_stream_fragment *frag_container; + size_t buf_len = stream->length + 1; /* +1 for null byte. */ + char *buf; + + buf = kunit_kzalloc(stream->test, buf_len, stream->gfp); + if (!buf) + return NULL; + + spin_lock(&stream->lock); + list_for_each_entry(frag_container, &stream->fragments, node) + strlcat(buf, frag_container->fragment, buf_len); + spin_unlock(&stream->lock); + + return buf; +} + +int string_stream_append(struct string_stream *stream, + struct string_stream *other) +{ + const char *other_content; + + other_content = string_stream_get_string(other); + + if (!other_content) + return -ENOMEM; + + return string_stream_add(stream, other_content); +} + +bool string_stream_is_empty(struct string_stream *stream) +{ + return list_empty(&stream->fragments); +} + +struct string_stream *alloc_string_stream(struct kunit *test, gfp_t gfp) +{ + struct string_stream *stream; + + stream = kunit_kzalloc(test, sizeof(*stream), gfp); + if (!stream) + return ERR_PTR(-ENOMEM); + + stream->gfp = gfp; + stream->test = test; + INIT_LIST_HEAD(&stream->fragments); + spin_lock_init(&stream->lock); + + return stream; +} + +void string_stream_destroy(struct string_stream *stream) +{ + string_stream_clear(stream); +} |