161 lines
3.5 KiB
C
161 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* C++ stream style string builder used in KUnit for building messages.
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*
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* Copyright (C) 2019, Google LLC.
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* Author: Brendan Higgins <brendanhiggins@google.com>
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*/
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#include <kunit/test.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include "string-stream.h"
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static struct string_stream_fragment *alloc_string_stream_fragment(
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struct kunit *test, int len, gfp_t gfp)
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{
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struct string_stream_fragment *frag;
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frag = kunit_kzalloc(test, sizeof(*frag), gfp);
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if (!frag)
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return ERR_PTR(-ENOMEM);
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frag->fragment = kunit_kmalloc(test, len, gfp);
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if (!frag->fragment) {
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kunit_kfree(test, frag);
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return ERR_PTR(-ENOMEM);
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}
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return frag;
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}
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static void string_stream_fragment_destroy(struct kunit *test,
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struct string_stream_fragment *frag)
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{
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list_del(&frag->node);
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kunit_kfree(test, frag->fragment);
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kunit_kfree(test, frag);
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}
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int string_stream_vadd(struct string_stream *stream,
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const char *fmt,
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va_list args)
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{
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struct string_stream_fragment *frag_container;
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int len;
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va_list args_for_counting;
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/* Make a copy because `vsnprintf` could change it */
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va_copy(args_for_counting, args);
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/* Need space for null byte. */
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len = vsnprintf(NULL, 0, fmt, args_for_counting) + 1;
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va_end(args_for_counting);
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frag_container = alloc_string_stream_fragment(stream->test,
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len,
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stream->gfp);
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if (IS_ERR(frag_container))
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return PTR_ERR(frag_container);
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len = vsnprintf(frag_container->fragment, len, fmt, args);
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spin_lock(&stream->lock);
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stream->length += len;
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list_add_tail(&frag_container->node, &stream->fragments);
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spin_unlock(&stream->lock);
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return 0;
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}
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int string_stream_add(struct string_stream *stream, const char *fmt, ...)
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{
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va_list args;
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int result;
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va_start(args, fmt);
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result = string_stream_vadd(stream, fmt, args);
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va_end(args);
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return result;
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}
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static void string_stream_clear(struct string_stream *stream)
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{
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struct string_stream_fragment *frag_container, *frag_container_safe;
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spin_lock(&stream->lock);
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list_for_each_entry_safe(frag_container,
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frag_container_safe,
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&stream->fragments,
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node) {
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string_stream_fragment_destroy(stream->test, frag_container);
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}
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stream->length = 0;
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spin_unlock(&stream->lock);
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}
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char *string_stream_get_string(struct string_stream *stream)
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{
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struct string_stream_fragment *frag_container;
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size_t buf_len = stream->length + 1; /* +1 for null byte. */
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char *buf;
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buf = kunit_kzalloc(stream->test, buf_len, stream->gfp);
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if (!buf)
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return NULL;
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spin_lock(&stream->lock);
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list_for_each_entry(frag_container, &stream->fragments, node)
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strlcat(buf, frag_container->fragment, buf_len);
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spin_unlock(&stream->lock);
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return buf;
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}
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int string_stream_append(struct string_stream *stream,
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struct string_stream *other)
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{
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const char *other_content;
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other_content = string_stream_get_string(other);
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if (!other_content)
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return -ENOMEM;
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return string_stream_add(stream, other_content);
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}
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bool string_stream_is_empty(struct string_stream *stream)
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{
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return list_empty(&stream->fragments);
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}
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struct string_stream_alloc_context {
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struct kunit *test;
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gfp_t gfp;
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};
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struct string_stream *alloc_string_stream(struct kunit *test, gfp_t gfp)
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{
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struct string_stream *stream;
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stream = kunit_kzalloc(test, sizeof(*stream), gfp);
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if (!stream)
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return ERR_PTR(-ENOMEM);
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stream->gfp = gfp;
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stream->test = test;
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INIT_LIST_HEAD(&stream->fragments);
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spin_lock_init(&stream->lock);
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return stream;
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}
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void string_stream_destroy(struct string_stream *stream)
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{
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string_stream_clear(stream);
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}
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