1 /* Common parts of the nanopb library. Most of these are quite low-level
2 * stuff. For the high-level interface, see pb_encode.h and pb_decode.h.
8 /*****************************************************************
9 * Nanopb compilation time options. You can change these here by *
10 * uncommenting the lines, or on the compiler command line. *
11 *****************************************************************/
13 /* Enable support for dynamically allocated fields */
14 /* #define PB_ENABLE_MALLOC 1 */
16 /* Define this if your CPU / compiler combination does not support
17 * unaligned memory access to packed structures. */
18 /* #define PB_NO_PACKED_STRUCTS 1 */
20 /* Increase the number of required fields that are tracked.
21 * A compiler warning will tell if you need this. */
22 /* #define PB_MAX_REQUIRED_FIELDS 256 */
24 /* Add support for tag numbers > 255 and fields larger than 255 bytes. */
25 /* #define PB_FIELD_16BIT 1 */
27 /* Add support for tag numbers > 65536 and fields larger than 65536 bytes. */
28 /* #define PB_FIELD_32BIT 1 */
30 /* Disable support for error messages in order to save some code space. */
31 /* #define PB_NO_ERRMSG 1 */
33 /* Disable support for custom streams (support only memory buffers). */
34 /* #define PB_BUFFER_ONLY 1 */
36 /* Switch back to the old-style callback function signature.
37 * This was the default until nanopb-0.2.1. */
38 /* #define PB_OLD_CALLBACK_STYLE */
41 /******************************************************************
42 * You usually don't need to change anything below this line. *
43 * Feel free to look around and use the defined macros, though. *
44 ******************************************************************/
47 /* Version of the nanopb library. Just in case you want to check it in
48 * your own program. */
49 #define NANOPB_VERSION nanopb-0.3.8
51 /* Include all the system headers needed by nanopb. You will need the
52 * definitions of the following:
53 * - strlen, memcpy, memset functions
54 * - [u]int_least8_t, uint_fast8_t, [u]int_least16_t, [u]int32_t, [u]int64_t
58 * If you don't have the standard header files, you can instead provide
59 * a custom header that defines or includes all this. In that case,
60 * define PB_SYSTEM_HEADER to the path of this file.
62 #ifdef PB_SYSTEM_HEADER
63 #include PB_SYSTEM_HEADER
70 #ifdef PB_ENABLE_MALLOC
75 /* Macro for defining packed structures (compiler dependent).
76 * This just reduces memory requirements, but is not required.
78 #if defined(PB_NO_PACKED_STRUCTS)
79 /* Disable struct packing */
80 # define PB_PACKED_STRUCT_START
81 # define PB_PACKED_STRUCT_END
83 #elif defined(__GNUC__) || defined(__clang__)
84 /* For GCC and clang */
85 # define PB_PACKED_STRUCT_START
86 # define PB_PACKED_STRUCT_END
87 # define pb_packed __attribute__((packed))
88 #elif defined(__ICCARM__) || defined(__CC_ARM)
89 /* For IAR ARM and Keil MDK-ARM compilers */
90 # define PB_PACKED_STRUCT_START _Pragma("pack(push, 1)")
91 # define PB_PACKED_STRUCT_END _Pragma("pack(pop)")
93 #elif defined(_MSC_VER) && (_MSC_VER >= 1500)
94 /* For Microsoft Visual C++ */
95 # define PB_PACKED_STRUCT_START __pragma(pack(push, 1))
96 # define PB_PACKED_STRUCT_END __pragma(pack(pop))
99 /* Unknown compiler */
100 # define PB_PACKED_STRUCT_START
101 # define PB_PACKED_STRUCT_END
105 /* Handly macro for suppressing unreferenced-parameter compiler warnings. */
107 #define PB_UNUSED(x) (void)(x)
110 /* Compile-time assertion, used for checking compatible compilation options.
111 * If this does not work properly on your compiler, use
112 * #define PB_NO_STATIC_ASSERT to disable it.
114 * But before doing that, check carefully the error message / place where it
115 * comes from to see if the error has a real cause. Unfortunately the error
116 * message is not always very clear to read, but you can see the reason better
117 * in the place where the PB_STATIC_ASSERT macro was called.
119 #ifndef PB_NO_STATIC_ASSERT
120 #ifndef PB_STATIC_ASSERT
121 #define PB_STATIC_ASSERT(COND,MSG) typedef char PB_STATIC_ASSERT_MSG(MSG, __LINE__, __COUNTER__)[(COND)?1:-1];
122 #define PB_STATIC_ASSERT_MSG(MSG, LINE, COUNTER) PB_STATIC_ASSERT_MSG_(MSG, LINE, COUNTER)
123 #define PB_STATIC_ASSERT_MSG_(MSG, LINE, COUNTER) pb_static_assertion_##MSG##LINE##COUNTER
126 #define PB_STATIC_ASSERT(COND,MSG)
129 /* Number of required fields to keep track of. */
130 #ifndef PB_MAX_REQUIRED_FIELDS
131 #define PB_MAX_REQUIRED_FIELDS 64
134 #if PB_MAX_REQUIRED_FIELDS < 64
135 #error You should not lower PB_MAX_REQUIRED_FIELDS from the default value (64).
138 /* List of possible field types. These are used in the autogenerated code.
139 * Least-significant 4 bits tell the scalar type
140 * Most-significant 4 bits specify repeated/required/packed etc.
143 typedef uint_least8_t pb_type_t;
145 /**** Field data types ****/
148 #define PB_LTYPE_VARINT 0x00 /* int32, int64, enum, bool */
149 #define PB_LTYPE_UVARINT 0x01 /* uint32, uint64 */
150 #define PB_LTYPE_SVARINT 0x02 /* sint32, sint64 */
151 #define PB_LTYPE_FIXED32 0x03 /* fixed32, sfixed32, float */
152 #define PB_LTYPE_FIXED64 0x04 /* fixed64, sfixed64, double */
154 /* Marker for last packable field type. */
155 #define PB_LTYPE_LAST_PACKABLE 0x04
157 /* Byte array with pre-allocated buffer.
158 * data_size is the length of the allocated PB_BYTES_ARRAY structure. */
159 #define PB_LTYPE_BYTES 0x05
161 /* String with pre-allocated buffer.
162 * data_size is the maximum length. */
163 #define PB_LTYPE_STRING 0x06
166 * submsg_fields is pointer to field descriptions */
167 #define PB_LTYPE_SUBMESSAGE 0x07
169 /* Extension pseudo-field
170 * The field contains a pointer to pb_extension_t */
171 #define PB_LTYPE_EXTENSION 0x08
173 /* Byte array with inline, pre-allocated byffer.
174 * data_size is the length of the inline, allocated buffer.
175 * This differs from PB_LTYPE_BYTES by defining the element as
176 * pb_byte_t[data_size] rather than pb_bytes_array_t. */
177 #define PB_LTYPE_FIXED_LENGTH_BYTES 0x09
179 /* Number of declared LTYPES */
180 #define PB_LTYPES_COUNT 0x0A
181 #define PB_LTYPE_MASK 0x0F
183 /**** Field repetition rules ****/
185 #define PB_HTYPE_REQUIRED 0x00
186 #define PB_HTYPE_OPTIONAL 0x10
187 #define PB_HTYPE_REPEATED 0x20
188 #define PB_HTYPE_ONEOF 0x30
189 #define PB_HTYPE_MASK 0x30
191 /**** Field allocation types ****/
193 #define PB_ATYPE_STATIC 0x00
194 #define PB_ATYPE_POINTER 0x80
195 #define PB_ATYPE_CALLBACK 0x40
196 #define PB_ATYPE_MASK 0xC0
198 #define PB_ATYPE(x) ((x) & PB_ATYPE_MASK)
199 #define PB_HTYPE(x) ((x) & PB_HTYPE_MASK)
200 #define PB_LTYPE(x) ((x) & PB_LTYPE_MASK)
202 /* Data type used for storing sizes of struct fields
205 #if defined(PB_FIELD_32BIT)
206 typedef uint32_t pb_size_t;
207 typedef int32_t pb_ssize_t;
208 #elif defined(PB_FIELD_16BIT)
209 typedef uint_least16_t pb_size_t;
210 typedef int_least16_t pb_ssize_t;
212 typedef uint_least8_t pb_size_t;
213 typedef int_least8_t pb_ssize_t;
215 #define PB_SIZE_MAX ((pb_size_t)-1)
217 /* Data type for storing encoded data and other byte streams.
218 * This typedef exists to support platforms where uint8_t does not exist.
219 * You can regard it as equivalent on uint8_t on other platforms.
221 typedef uint_least8_t pb_byte_t;
223 /* This structure is used in auto-generated constants
224 * to specify struct fields.
225 * You can change field sizes if you need structures
226 * larger than 256 bytes or field tags larger than 256.
227 * The compiler should complain if your .proto has such
228 * structures. Fix that by defining PB_FIELD_16BIT or
231 PB_PACKED_STRUCT_START
232 typedef struct pb_field_s pb_field_t;
236 pb_size_t data_offset; /* Offset of field data, relative to previous field. */
237 pb_ssize_t size_offset; /* Offset of array size or has-boolean, relative to data */
238 pb_size_t data_size; /* Data size in bytes for a single item */
239 pb_size_t array_size; /* Maximum number of entries in array */
241 /* Field definitions for submessage
242 * OR default value for all other non-array, non-callback types
243 * If null, then field will zeroed. */
248 /* Make sure that the standard integer types are of the expected sizes.
249 * Otherwise fixed32/fixed64 fields can break.
251 * If you get errors here, it probably means that your stdint.h is not
252 * correct for your platform.
254 PB_STATIC_ASSERT(sizeof(int64_t) == 2 * sizeof(int32_t), INT64_T_WRONG_SIZE)
255 PB_STATIC_ASSERT(sizeof(uint64_t) == 2 * sizeof(uint32_t), UINT64_T_WRONG_SIZE)
257 /* This structure is used for 'bytes' arrays.
258 * It has the number of bytes in the beginning, and after that an array.
259 * Note that actual structs used will have a different length of bytes array.
261 #define PB_BYTES_ARRAY_T(n) struct { pb_size_t size; pb_byte_t bytes[n]; }
262 #define PB_BYTES_ARRAY_T_ALLOCSIZE(n) ((size_t)n + offsetof(pb_bytes_array_t, bytes))
264 struct pb_bytes_array_s {
268 typedef struct pb_bytes_array_s pb_bytes_array_t;
270 /* This structure is used for giving the callback function.
271 * It is stored in the message structure and filled in by the method that
274 * The decoding callback will be given a limited-length stream
275 * If the wire type was string, the length is the length of the string.
276 * If the wire type was a varint/fixed32/fixed64, the length is the length
277 * of the actual value.
278 * The function may be called multiple times (especially for repeated types,
279 * but also otherwise if the message happens to contain the field multiple
282 * The encoding callback will receive the actual output stream.
283 * It should write all the data in one call, including the field tag and
284 * wire type. It can write multiple fields.
286 * The callback can be null if you want to skip a field.
288 typedef struct pb_istream_s pb_istream_t;
289 typedef struct pb_ostream_s pb_ostream_t;
290 typedef struct pb_callback_s pb_callback_t;
291 struct pb_callback_s {
292 #ifdef PB_OLD_CALLBACK_STYLE
293 /* Deprecated since nanopb-0.2.1 */
295 bool (*decode)(pb_istream_t *stream, const pb_field_t *field, void *arg);
296 bool (*encode)(pb_ostream_t *stream, const pb_field_t *field, const void *arg);
299 /* New function signature, which allows modifying arg contents in callback. */
301 bool (*decode)(pb_istream_t *stream, const pb_field_t *field, void **arg);
302 bool (*encode)(pb_ostream_t *stream, const pb_field_t *field, void * const *arg);
306 /* Free arg for use by callback */
310 /* Wire types. Library user needs these only in encoder callbacks. */
318 /* Structure for defining the handling of unknown/extension fields.
319 * Usually the pb_extension_type_t structure is automatically generated,
320 * while the pb_extension_t structure is created by the user. However,
321 * if you want to catch all unknown fields, you can also create a custom
322 * pb_extension_type_t with your own callback.
324 typedef struct pb_extension_type_s pb_extension_type_t;
325 typedef struct pb_extension_s pb_extension_t;
326 struct pb_extension_type_s {
327 /* Called for each unknown field in the message.
328 * If you handle the field, read off all of its data and return true.
329 * If you do not handle the field, do not read anything and return true.
330 * If you run into an error, return false.
331 * Set to NULL for default handler.
333 bool (*decode)(pb_istream_t *stream, pb_extension_t *extension,
334 uint32_t tag, pb_wire_type_t wire_type);
336 /* Called once after all regular fields have been encoded.
337 * If you have something to write, do so and return true.
338 * If you do not have anything to write, just return true.
339 * If you run into an error, return false.
340 * Set to NULL for default handler.
342 bool (*encode)(pb_ostream_t *stream, const pb_extension_t *extension);
344 /* Free field for use by the callback. */
348 struct pb_extension_s {
349 /* Type describing the extension field. Usually you'll initialize
350 * this to a pointer to the automatically generated structure. */
351 const pb_extension_type_t *type;
353 /* Destination for the decoded data. This must match the datatype
354 * of the extension field. */
357 /* Pointer to the next extension handler, or NULL.
358 * If this extension does not match a field, the next handler is
359 * automatically called. */
360 pb_extension_t *next;
362 /* The decoder sets this to true if the extension was found.
363 * Ignored for encoding. */
367 /* Memory allocation functions to use. You can define pb_realloc and
368 * pb_free to custom functions if you want. */
369 #ifdef PB_ENABLE_MALLOC
371 # define pb_realloc(ptr, size) realloc(ptr, size)
374 # define pb_free(ptr) free(ptr)
378 /* This is used to inform about need to regenerate .pb.h/.pb.c files. */
379 #define PB_PROTO_HEADER_VERSION 30
381 /* These macros are used to declare pb_field_t's in the constant array. */
382 /* Size of a structure member, in bytes. */
383 #define pb_membersize(st, m) (sizeof ((st*)0)->m)
384 /* Number of entries in an array. */
385 #define pb_arraysize(st, m) (pb_membersize(st, m) / pb_membersize(st, m[0]))
386 /* Delta from start of one member to the start of another member. */
387 #define pb_delta(st, m1, m2) ((int)offsetof(st, m1) - (int)offsetof(st, m2))
388 /* Marks the end of the field list */
389 #define PB_LAST_FIELD {0,(pb_type_t) 0,0,0,0,0,0}
391 /* Macros for filling in the data_offset field */
392 /* data_offset for first field in a message */
393 #define PB_DATAOFFSET_FIRST(st, m1, m2) (offsetof(st, m1))
394 /* data_offset for subsequent fields */
395 #define PB_DATAOFFSET_OTHER(st, m1, m2) (offsetof(st, m1) - offsetof(st, m2) - pb_membersize(st, m2))
396 /* data offset for subsequent fields inside an union (oneof) */
397 #define PB_DATAOFFSET_UNION(st, m1, m2) (PB_SIZE_MAX)
398 /* Choose first/other based on m1 == m2 (deprecated, remains for backwards compatibility) */
399 #define PB_DATAOFFSET_CHOOSE(st, m1, m2) (int)(offsetof(st, m1) == offsetof(st, m2) \
400 ? PB_DATAOFFSET_FIRST(st, m1, m2) \
401 : PB_DATAOFFSET_OTHER(st, m1, m2))
403 /* Required fields are the simplest. They just have delta (padding) from
404 * previous field end, and the size of the field. Pointer is used for
405 * submessages and default values.
407 #define PB_REQUIRED_STATIC(tag, st, m, fd, ltype, ptr) \
408 {tag, PB_ATYPE_STATIC | PB_HTYPE_REQUIRED | ltype, \
409 fd, 0, pb_membersize(st, m), 0, ptr}
411 /* Optional fields add the delta to the has_ variable. */
412 #define PB_OPTIONAL_STATIC(tag, st, m, fd, ltype, ptr) \
413 {tag, PB_ATYPE_STATIC | PB_HTYPE_OPTIONAL | ltype, \
415 pb_delta(st, has_ ## m, m), \
416 pb_membersize(st, m), 0, ptr}
418 #define PB_SINGULAR_STATIC(tag, st, m, fd, ltype, ptr) \
419 {tag, PB_ATYPE_STATIC | PB_HTYPE_OPTIONAL | ltype, \
420 fd, 0, pb_membersize(st, m), 0, ptr}
422 /* Repeated fields have a _count field and also the maximum number of entries. */
423 #define PB_REPEATED_STATIC(tag, st, m, fd, ltype, ptr) \
424 {tag, PB_ATYPE_STATIC | PB_HTYPE_REPEATED | ltype, \
426 pb_delta(st, m ## _count, m), \
427 pb_membersize(st, m[0]), \
428 pb_arraysize(st, m), ptr}
430 /* Allocated fields carry the size of the actual data, not the pointer */
431 #define PB_REQUIRED_POINTER(tag, st, m, fd, ltype, ptr) \
432 {tag, PB_ATYPE_POINTER | PB_HTYPE_REQUIRED | ltype, \
433 fd, 0, pb_membersize(st, m[0]), 0, ptr}
435 /* Optional fields don't need a has_ variable, as information would be redundant */
436 #define PB_OPTIONAL_POINTER(tag, st, m, fd, ltype, ptr) \
437 {tag, PB_ATYPE_POINTER | PB_HTYPE_OPTIONAL | ltype, \
438 fd, 0, pb_membersize(st, m[0]), 0, ptr}
440 /* Same as optional fields*/
441 #define PB_SINGULAR_POINTER(tag, st, m, fd, ltype, ptr) \
442 {tag, PB_ATYPE_POINTER | PB_HTYPE_OPTIONAL | ltype, \
443 fd, 0, pb_membersize(st, m[0]), 0, ptr}
445 /* Repeated fields have a _count field and a pointer to array of pointers */
446 #define PB_REPEATED_POINTER(tag, st, m, fd, ltype, ptr) \
447 {tag, PB_ATYPE_POINTER | PB_HTYPE_REPEATED | ltype, \
448 fd, pb_delta(st, m ## _count, m), \
449 pb_membersize(st, m[0]), 0, ptr}
451 /* Callbacks are much like required fields except with special datatype. */
452 #define PB_REQUIRED_CALLBACK(tag, st, m, fd, ltype, ptr) \
453 {tag, PB_ATYPE_CALLBACK | PB_HTYPE_REQUIRED | ltype, \
454 fd, 0, pb_membersize(st, m), 0, ptr}
456 #define PB_OPTIONAL_CALLBACK(tag, st, m, fd, ltype, ptr) \
457 {tag, PB_ATYPE_CALLBACK | PB_HTYPE_OPTIONAL | ltype, \
458 fd, 0, pb_membersize(st, m), 0, ptr}
460 #define PB_SINGULAR_CALLBACK(tag, st, m, fd, ltype, ptr) \
461 {tag, PB_ATYPE_CALLBACK | PB_HTYPE_OPTIONAL | ltype, \
462 fd, 0, pb_membersize(st, m), 0, ptr}
464 #define PB_REPEATED_CALLBACK(tag, st, m, fd, ltype, ptr) \
465 {tag, PB_ATYPE_CALLBACK | PB_HTYPE_REPEATED | ltype, \
466 fd, 0, pb_membersize(st, m), 0, ptr}
468 /* Optional extensions don't have the has_ field, as that would be redundant.
469 * Furthermore, the combination of OPTIONAL without has_ field is used
470 * for indicating proto3 style fields. Extensions exist in proto2 mode only,
471 * so they should be encoded according to proto2 rules. To avoid the conflict,
472 * extensions are marked as REQUIRED instead.
474 #define PB_OPTEXT_STATIC(tag, st, m, fd, ltype, ptr) \
475 {tag, PB_ATYPE_STATIC | PB_HTYPE_REQUIRED | ltype, \
478 pb_membersize(st, m), 0, ptr}
480 #define PB_OPTEXT_POINTER(tag, st, m, fd, ltype, ptr) \
481 PB_OPTIONAL_POINTER(tag, st, m, fd, ltype, ptr)
483 #define PB_OPTEXT_CALLBACK(tag, st, m, fd, ltype, ptr) \
484 PB_OPTIONAL_CALLBACK(tag, st, m, fd, ltype, ptr)
486 /* The mapping from protobuf types to LTYPEs is done using these macros. */
487 #define PB_LTYPE_MAP_BOOL PB_LTYPE_VARINT
488 #define PB_LTYPE_MAP_BYTES PB_LTYPE_BYTES
489 #define PB_LTYPE_MAP_DOUBLE PB_LTYPE_FIXED64
490 #define PB_LTYPE_MAP_ENUM PB_LTYPE_VARINT
491 #define PB_LTYPE_MAP_UENUM PB_LTYPE_UVARINT
492 #define PB_LTYPE_MAP_FIXED32 PB_LTYPE_FIXED32
493 #define PB_LTYPE_MAP_FIXED64 PB_LTYPE_FIXED64
494 #define PB_LTYPE_MAP_FLOAT PB_LTYPE_FIXED32
495 #define PB_LTYPE_MAP_INT32 PB_LTYPE_VARINT
496 #define PB_LTYPE_MAP_INT64 PB_LTYPE_VARINT
497 #define PB_LTYPE_MAP_MESSAGE PB_LTYPE_SUBMESSAGE
498 #define PB_LTYPE_MAP_SFIXED32 PB_LTYPE_FIXED32
499 #define PB_LTYPE_MAP_SFIXED64 PB_LTYPE_FIXED64
500 #define PB_LTYPE_MAP_SINT32 PB_LTYPE_SVARINT
501 #define PB_LTYPE_MAP_SINT64 PB_LTYPE_SVARINT
502 #define PB_LTYPE_MAP_STRING PB_LTYPE_STRING
503 #define PB_LTYPE_MAP_UINT32 PB_LTYPE_UVARINT
504 #define PB_LTYPE_MAP_UINT64 PB_LTYPE_UVARINT
505 #define PB_LTYPE_MAP_EXTENSION PB_LTYPE_EXTENSION
506 #define PB_LTYPE_MAP_FIXED_LENGTH_BYTES PB_LTYPE_FIXED_LENGTH_BYTES
508 /* This is the actual macro used in field descriptions.
509 * It takes these arguments:
511 * - Field type: BOOL, BYTES, DOUBLE, ENUM, UENUM, FIXED32, FIXED64,
512 * FLOAT, INT32, INT64, MESSAGE, SFIXED32, SFIXED64
513 * SINT32, SINT64, STRING, UINT32, UINT64 or EXTENSION
514 * - Field rules: REQUIRED, OPTIONAL or REPEATED
515 * - Allocation: STATIC, CALLBACK or POINTER
516 * - Placement: FIRST or OTHER, depending on if this is the first field in structure.
519 * - Previous field name (or field name again for first field)
520 * - Pointer to default value or submsg fields.
523 #define PB_FIELD(tag, type, rules, allocation, placement, message, field, prevfield, ptr) \
524 PB_ ## rules ## _ ## allocation(tag, message, field, \
525 PB_DATAOFFSET_ ## placement(message, field, prevfield), \
526 PB_LTYPE_MAP_ ## type, ptr)
528 /* Field description for oneof fields. This requires taking into account the
529 * union name also, that's why a separate set of macros is needed.
531 #define PB_ONEOF_STATIC(u, tag, st, m, fd, ltype, ptr) \
532 {tag, PB_ATYPE_STATIC | PB_HTYPE_ONEOF | ltype, \
533 fd, pb_delta(st, which_ ## u, u.m), \
534 pb_membersize(st, u.m), 0, ptr}
536 #define PB_ONEOF_POINTER(u, tag, st, m, fd, ltype, ptr) \
537 {tag, PB_ATYPE_POINTER | PB_HTYPE_ONEOF | ltype, \
538 fd, pb_delta(st, which_ ## u, u.m), \
539 pb_membersize(st, u.m[0]), 0, ptr}
541 #define PB_ONEOF_FIELD(union_name, tag, type, rules, allocation, placement, message, field, prevfield, ptr) \
542 PB_ONEOF_ ## allocation(union_name, tag, message, field, \
543 PB_DATAOFFSET_ ## placement(message, union_name.field, prevfield), \
544 PB_LTYPE_MAP_ ## type, ptr)
546 #define PB_ANONYMOUS_ONEOF_STATIC(u, tag, st, m, fd, ltype, ptr) \
547 {tag, PB_ATYPE_STATIC | PB_HTYPE_ONEOF | ltype, \
548 fd, pb_delta(st, which_ ## u, m), \
549 pb_membersize(st, m), 0, ptr}
551 #define PB_ANONYMOUS_ONEOF_POINTER(u, tag, st, m, fd, ltype, ptr) \
552 {tag, PB_ATYPE_POINTER | PB_HTYPE_ONEOF | ltype, \
553 fd, pb_delta(st, which_ ## u, m), \
554 pb_membersize(st, m[0]), 0, ptr}
556 #define PB_ANONYMOUS_ONEOF_FIELD(union_name, tag, type, rules, allocation, placement, message, field, prevfield, ptr) \
557 PB_ANONYMOUS_ONEOF_ ## allocation(union_name, tag, message, field, \
558 PB_DATAOFFSET_ ## placement(message, field, prevfield), \
559 PB_LTYPE_MAP_ ## type, ptr)
561 /* These macros are used for giving out error messages.
562 * They are mostly a debugging aid; the main error information
563 * is the true/false return value from functions.
564 * Some code space can be saved by disabling the error
565 * messages if not used.
567 * PB_SET_ERROR() sets the error message if none has been set yet.
568 * msg must be a constant string literal.
569 * PB_GET_ERROR() always returns a pointer to a string.
570 * PB_RETURN_ERROR() sets the error and returns false from current
574 #define PB_SET_ERROR(stream, msg) PB_UNUSED(stream)
575 #define PB_GET_ERROR(stream) "(errmsg disabled)"
577 #define PB_SET_ERROR(stream, msg) (stream->errmsg = (stream)->errmsg ? (stream)->errmsg : (msg))
578 #define PB_GET_ERROR(stream) ((stream)->errmsg ? (stream)->errmsg : "(none)")
581 #define PB_RETURN_ERROR(stream, msg) return PB_SET_ERROR(stream, msg), false