1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * C++ stream style string builder used in KUnit for building messages. 4 * 5 * Copyright (C) 2019, Google LLC. 6 * Author: Brendan Higgins <[email protected]> 7 */ 8 9 #ifndef _KUNIT_STRING_STREAM_H 10 #define _KUNIT_STRING_STREAM_H 11 12 #include <linux/spinlock.h> 13 #include <linux/types.h> 14 #include <linux/stdarg.h> 15 16 struct string_stream_fragment { 17 struct list_head node; 18 char *fragment; 19 }; 20 21 struct string_stream { 22 size_t length; 23 struct list_head fragments; 24 /* length and fragments are protected by this lock */ 25 spinlock_t lock; 26 struct kunit *test; 27 gfp_t gfp; 28 bool append_newlines; 29 }; 30 31 struct kunit; 32 33 struct string_stream *alloc_string_stream(struct kunit *test, gfp_t gfp); 34 35 int __printf(2, 3) string_stream_add(struct string_stream *stream, 36 const char *fmt, ...); 37 38 int __printf(2, 0) string_stream_vadd(struct string_stream *stream, 39 const char *fmt, 40 va_list args); 41 42 char *string_stream_get_string(struct string_stream *stream); 43 44 int string_stream_append(struct string_stream *stream, 45 struct string_stream *other); 46 47 bool string_stream_is_empty(struct string_stream *stream); 48 49 void string_stream_destroy(struct string_stream *stream); 50 51 static inline void string_stream_set_append_newlines(struct string_stream *stream, 52 bool append_newlines) 53 { 54 stream->append_newlines = append_newlines; 55 } 56 57 #endif /* _KUNIT_STRING_STREAM_H */ 58