/* 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>
 */

#ifndef _KUNIT_STRING_STREAM_H
#define _KUNIT_STRING_STREAM_H

#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/stdarg.h>

struct string_stream_fragment {
        struct list_head node;
        char *fragment;
};

struct string_stream {
        size_t length;
        struct list_head fragments;
        /* length and fragments are protected by this lock */
        spinlock_t lock;
        gfp_t gfp;
        bool append_newlines;
};

struct kunit;

struct string_stream *kunit_alloc_string_stream(struct kunit *test, gfp_t gfp);
void kunit_free_string_stream(struct kunit *test, struct string_stream *stream);

struct string_stream *alloc_string_stream(gfp_t gfp);
void free_string_stream(struct string_stream *stream);

int __printf(2, 3) string_stream_add(struct string_stream *stream,
                                     const char *fmt, ...);

int __printf(2, 0) string_stream_vadd(struct string_stream *stream,
                                      const char *fmt,
                                      va_list args);

void string_stream_clear(struct string_stream *stream);

char *string_stream_get_string(struct string_stream *stream);

int string_stream_append(struct string_stream *stream,
                         struct string_stream *other);

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 */