Merge pull request #46 from wiml/constify

Move as much data as possible into non-writable text by declaring it const
vlm · Oct 13, 2014 · 78d604f · 78d604f
2 parents 41bbf1c + 59e8d28
commit 78d604f
Show file tree

Hide file tree

Showing 47 changed files with 139 additions and 140 deletions.
diff --git a/libasn1compiler/asn1c_C.c b/libasn1compiler/asn1c_C.c
@@ -175,7 +175,7 @@ asn1c_lang_C_type_common_INTEGER(arg_t *arg) {
 		 */
 		REDIR(OT_STAT_DEFS);
 
-		OUT("static asn_INTEGER_enum_map_t asn_MAP_%s_value2enum_%d[] = {\n",
+		OUT("static const asn_INTEGER_enum_map_t asn_MAP_%s_value2enum_%d[] = {\n",
 			MKID(expr), expr->_type_unique_index);
 		qsort(v2e, el_count, sizeof(v2e[0]), compar_enumMap_byValue);
 		for(eidx = 0; eidx < el_count; eidx++) {
@@ -189,7 +189,7 @@ asn1c_lang_C_type_common_INTEGER(arg_t *arg) {
 			OUT("\t/* This list is extensible */\n");
 		OUT("};\n");
 
-		OUT("static unsigned int asn_MAP_%s_enum2value_%d[] = {\n",
+		OUT("static const unsigned int asn_MAP_%s_enum2value_%d[] = {\n",
 			MKID(expr), expr->_type_unique_index);
 		qsort(v2e, el_count, sizeof(v2e[0]), compar_enumMap_byName);
 		for(eidx = 0; eidx < el_count; eidx++) {
@@ -202,7 +202,7 @@ asn1c_lang_C_type_common_INTEGER(arg_t *arg) {
 			OUT("\t/* This list is extensible */\n");
 		OUT("};\n");
 
-		OUT("static asn_INTEGER_specifics_t asn_SPC_%s_specs_%d = {\n",
+		OUT("static const asn_INTEGER_specifics_t asn_SPC_%s_specs_%d = {\n",
 			MKID(expr), expr->_type_unique_index);
 		INDENT(+1);
 		OUT("asn_MAP_%s_value2enum_%d,\t"
@@ -234,7 +234,7 @@ asn1c_lang_C_type_common_INTEGER(arg_t *arg) {
 	if(expr->expr_type == ASN_BASIC_INTEGER
 	&& asn1c_type_fits_long(arg, expr) == FL_FITS_UNSIGN) {
 		REDIR(OT_STAT_DEFS);
-		OUT("static asn_INTEGER_specifics_t asn_SPC_%s_specs_%d = {\n",
+		OUT("static const asn_INTEGER_specifics_t asn_SPC_%s_specs_%d = {\n",
 			MKID(expr), expr->_type_unique_index);
 		INDENT(+1);
 		OUT("0,\t");
@@ -383,7 +383,7 @@ asn1c_lang_C_type_SEQUENCE_def(arg_t *arg) {
 			int elm = 0;
 			int comma = 0;
 			comp_mode = 0;
-			OUT("static int asn_MAP_%s_oms_%d[] = {",
+			OUT("static const int asn_MAP_%s_oms_%d[] = {",
 				MKID(expr),
 				expr->_type_unique_index);
 			TQ_FOR(v, &(expr->members), next) {
@@ -628,7 +628,7 @@ asn1c_lang_C_type_SET_def(arg_t *arg) {
 	/*
 	 * Emit a map of mandatory elements.
 	 */
-	OUT("static uint8_t asn_MAP_%s_mmap_%d",
+	OUT("static const uint8_t asn_MAP_%s_mmap_%d",
 		MKID(expr), expr->_type_unique_index);
 	p = MKID_safe(expr);
 	OUT("[(%d + (8 * sizeof(unsigned int)) - 1) / 8]", elements);
@@ -964,7 +964,7 @@ asn1c_lang_C_type_CHOICE_def(arg_t *arg) {
 		int i;
 		cmap = compute_canonical_members_order(arg, elements);
 		if(cmap) {
-			OUT("static int asn_MAP_%s_cmap_%d[] = {",
+			OUT("static const int asn_MAP_%s_cmap_%d[] = {",
 				MKID(expr),
 				expr->_type_unique_index);
 			for(i = 0; i < elements; i++) {
@@ -1661,7 +1661,7 @@ emit_tag2member_map(arg_t *arg, tag2el_t *tag2el, int tag2el_count, const char *
 
 	if(!tag2el_count) return 0;	/* No top level tags */
 
-	OUT("static asn_TYPE_tag2member_t asn_MAP_%s_tag2el%s_%d[] = {\n",
+	OUT("static const asn_TYPE_tag2member_t asn_MAP_%s_tag2el%s_%d[] = {\n",
 		MKID(expr), opt_modifier?opt_modifier:"",
 		expr->_type_unique_index);
 	for(i = 0; i < tag2el_count; i++) {
@@ -1730,7 +1730,7 @@ emit_tags_vectors(arg_t *arg, asn1p_expr_t *expr, int *tags_count_r, int *all_ta
 	}
 
 #define	EMIT_TAGS_TABLE(name, tags, tags_count)	do {			\
-		OUT("static ber_tlv_tag_t asn_DEF_%s%s_tags_%d[] = {\n",\
+		OUT("static const ber_tlv_tag_t asn_DEF_%s%s_tags_%d[] = {\n",\
 			MKID(expr), name,			\
 			expr->_type_unique_index);			\
 		INDENT(+1);						\

diff --git a/libasn1compiler/asn1c_constraint.c b/libasn1compiler/asn1c_constraint.c
@@ -315,7 +315,7 @@ asn1c_emit_constraint_tables(arg_t *arg, int got_size) {
 
 		untl = (range_stop - range_start) + 1;
 		untl += (untl % 16)?16 - (untl % 16):0;
-		OUT("static int permitted_alphabet_table_%d[%d] = {\n",
+		OUT("static const int permitted_alphabet_table_%d[%d] = {\n",
 			arg->expr->_type_unique_index, max_table_size);
 		for(n = 0; n < untl; n++) {
 			cardinal += table[n] ? 1 : 0;
@@ -347,7 +347,7 @@ asn1c_emit_constraint_tables(arg_t *arg, int got_size) {
 		if((arg->flags & A1C_GEN_PER)
 		&& (etype & ASN_STRING_KM_MASK)) {
 		    int c;
-		    OUT("static int permitted_alphabet_code2value_%d[%d] = {\n",
+		    OUT("static const int permitted_alphabet_code2value_%d[%d] = {\n",
 			arg->expr->_type_unique_index, cardinal);
 		    for(n = c = 0; c < max_table_size; c++) {
 			if(table[c]) {
@@ -396,7 +396,7 @@ asn1c_emit_constraint_tables(arg_t *arg, int got_size) {
 		OUT("\n");
 	} else {
 		if(use_table) {
-			OUT("int *table = permitted_alphabet_table_%d;\n",
+			OUT("const int *table = permitted_alphabet_table_%d;\n",
 				arg->expr->_type_unique_index);
 			emit_alphabet_check_loop(arg, 0);
 		} else {

diff --git a/skeletons/BIT_STRING.c b/skeletons/BIT_STRING.c
@@ -9,7 +9,7 @@
 /*
  * BIT STRING basic type description.
  */
-static ber_tlv_tag_t asn_DEF_BIT_STRING_tags[] = {
+static const ber_tlv_tag_t asn_DEF_BIT_STRING_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (3 << 2))
 };
 static asn_OCTET_STRING_specifics_t asn_DEF_BIT_STRING_specs = {
@@ -140,7 +140,7 @@ BIT_STRING_encode_xer(asn_TYPE_descriptor_t *td, void *sptr,
 int
 BIT_STRING_print(asn_TYPE_descriptor_t *td, const void *sptr, int ilevel,
 		asn_app_consume_bytes_f *cb, void *app_key) {
-	static const char *h2c = "0123456789ABCDEF";
+	const char * const h2c = "0123456789ABCDEF";
 	char scratch[64];
 	const BIT_STRING_t *st = (const BIT_STRING_t *)sptr;
 	uint8_t *buf;

diff --git a/skeletons/BMPString.c b/skeletons/BMPString.c
@@ -9,7 +9,7 @@
 /*
  * BMPString basic type description.
  */
-static ber_tlv_tag_t asn_DEF_BMPString_tags[] = {
+static const ber_tlv_tag_t asn_DEF_BMPString_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (30 << 2)),	/* [UNIVERSAL 30] IMPLICIT ...*/
 	(ASN_TAG_CLASS_UNIVERSAL | (4 << 2))	/* ... OCTET STRING */
 };

diff --git a/skeletons/BOOLEAN.c b/skeletons/BOOLEAN.c
@@ -9,7 +9,7 @@
 /*
  * BOOLEAN basic type description.
  */
-static ber_tlv_tag_t asn_DEF_BOOLEAN_tags[] = {
+static const ber_tlv_tag_t asn_DEF_BOOLEAN_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (1 << 2))
 };
 asn_TYPE_descriptor_t asn_DEF_BOOLEAN = {

diff --git a/skeletons/ENUMERATED.c b/skeletons/ENUMERATED.c
@@ -11,7 +11,7 @@
 /*
  * ENUMERATED basic type description.
  */
-static ber_tlv_tag_t asn_DEF_ENUMERATED_tags[] = {
+static const ber_tlv_tag_t asn_DEF_ENUMERATED_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (10 << 2))
 };
 asn_TYPE_descriptor_t asn_DEF_ENUMERATED = {

diff --git a/skeletons/GeneralString.c b/skeletons/GeneralString.c
@@ -8,7 +8,7 @@
 /*
  * GeneralString basic type description.
  */
-static ber_tlv_tag_t asn_DEF_GeneralString_tags[] = {
+static const ber_tlv_tag_t asn_DEF_GeneralString_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (27 << 2)),	/* [UNIVERSAL 27] IMPLICIT ...*/
 	(ASN_TAG_CLASS_UNIVERSAL | (4 << 2))	/* ... OCTET STRING */
 };

diff --git a/skeletons/GeneralizedTime.c b/skeletons/GeneralizedTime.c
@@ -147,7 +147,7 @@ static time_t timegm(struct tm *tm) {
 /*
  * GeneralizedTime basic type description.
  */
-static ber_tlv_tag_t asn_DEF_GeneralizedTime_tags[] = {
+static const ber_tlv_tag_t asn_DEF_GeneralizedTime_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (24 << 2)),	/* [UNIVERSAL 24] IMPLICIT ...*/
 	(ASN_TAG_CLASS_UNIVERSAL | (26 << 2)),  /* [UNIVERSAL 26] IMPLICIT ...*/
 	(ASN_TAG_CLASS_UNIVERSAL | (4 << 2))    /* ... OCTET STRING */

diff --git a/skeletons/GraphicString.c b/skeletons/GraphicString.c
@@ -8,7 +8,7 @@
 /*
  * GraphicString basic type description.
  */
-static ber_tlv_tag_t asn_DEF_GraphicString_tags[] = {
+static const ber_tlv_tag_t asn_DEF_GraphicString_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (25 << 2)),	/* [UNIVERSAL 25] IMPLICIT ...*/
 	(ASN_TAG_CLASS_UNIVERSAL | (4 << 2))	/* ... OCTET STRING */
 };

diff --git a/skeletons/IA5String.c b/skeletons/IA5String.c
@@ -8,7 +8,7 @@
 /*
  * IA5String basic type description.
  */
-static ber_tlv_tag_t asn_DEF_IA5String_tags[] = {
+static const ber_tlv_tag_t asn_DEF_IA5String_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (22 << 2)),	/* [UNIVERSAL 22] IMPLICIT ...*/
 	(ASN_TAG_CLASS_UNIVERSAL | (4 << 2))	/* ... OCTET STRING */
 };

diff --git a/skeletons/INTEGER.c b/skeletons/INTEGER.c
@@ -11,7 +11,7 @@
 /*
  * INTEGER basic type description.
  */
-static ber_tlv_tag_t asn_DEF_INTEGER_tags[] = {
+static const ber_tlv_tag_t asn_DEF_INTEGER_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (2 << 2))
 };
 asn_TYPE_descriptor_t asn_DEF_INTEGER = {
@@ -106,7 +106,7 @@ static const asn_INTEGER_enum_map_t *INTEGER_map_enum2value(asn_INTEGER_specific
  * INTEGER specific human-readable output.
  */
 static ssize_t
-INTEGER__dump(asn_TYPE_descriptor_t *td, const INTEGER_t *st, asn_app_consume_bytes_f *cb, void *app_key, int plainOrXER) {
+INTEGER__dump(const asn_TYPE_descriptor_t *td, const INTEGER_t *st, asn_app_consume_bytes_f *cb, void *app_key, int plainOrXER) {
 	asn_INTEGER_specifics_t *specs=(asn_INTEGER_specifics_t *)td->specifics;
 	char scratch[32];	/* Enough for 64-bit integer */
 	uint8_t *buf = st->buf;
@@ -166,7 +166,7 @@ INTEGER__dump(asn_TYPE_descriptor_t *td, const INTEGER_t *st, asn_app_consume_by
 	/* Output in the long xx:yy:zz... format */
 	/* TODO: replace with generic algorithm (Knuth TAOCP Vol 2, 4.3.1) */
 	for(p = scratch; buf < buf_end; buf++) {
-		static const char *h2c = "0123456789ABCDEF";
+		const char * const h2c = "0123456789ABCDEF";
 		if((p - scratch) >= (ssize_t)(sizeof(scratch) - 4)) {
 			/* Flush buffer */
 			if(cb(scratch, p - scratch, app_key) < 0)
@@ -208,8 +208,8 @@ INTEGER_print(asn_TYPE_descriptor_t *td, const void *sptr, int ilevel,
 struct e2v_key {
 	const char *start;
 	const char *stop;
-	asn_INTEGER_enum_map_t *vemap;
-	unsigned int *evmap;
+	const asn_INTEGER_enum_map_t *vemap;
+	const unsigned int *evmap;
 };
 static int
 INTEGER__compar_enum2value(const void *kp, const void *am) {
@@ -232,7 +232,7 @@ INTEGER__compar_enum2value(const void *kp, const void *am) {
 
 static const asn_INTEGER_enum_map_t *
 INTEGER_map_enum2value(asn_INTEGER_specifics_t *specs, const char *lstart, const char *lstop) {
-	asn_INTEGER_enum_map_t *el_found;
+	const asn_INTEGER_enum_map_t *el_found;
 	int count = specs ? specs->map_count : 0;
 	struct e2v_key key;
 	const char *lp;

diff --git a/skeletons/INTEGER.h b/skeletons/INTEGER.h
@@ -24,9 +24,9 @@ typedef struct asn_INTEGER_enum_map_s {
 } asn_INTEGER_enum_map_t;
 
 /* This type describes an enumeration for INTEGER and ENUMERATED types */
-typedef struct asn_INTEGER_specifics_s {
-	asn_INTEGER_enum_map_t *value2enum;	/* N -> "tag"; sorted by N */
-	unsigned int *enum2value;		/* "tag" => N; sorted by tag */
+typedef const struct asn_INTEGER_specifics_s {
+	const asn_INTEGER_enum_map_t *value2enum;	/* N -> "tag"; sorted by N */
+	const unsigned int *enum2value;		/* "tag" => N; sorted by tag */
 	int map_count;				/* Elements in either map */
 	int extension;				/* This map is extensible */
 	int strict_enumeration;			/* Enumeration set is fixed */

diff --git a/skeletons/ISO646String.c b/skeletons/ISO646String.c
@@ -8,7 +8,7 @@
 /*
  * ISO646String basic type description.
  */
-static ber_tlv_tag_t asn_DEF_ISO646String_tags[] = {
+static const ber_tlv_tag_t asn_DEF_ISO646String_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (26 << 2)),	/* [UNIVERSAL 26] IMPLICIT ...*/
 	(ASN_TAG_CLASS_UNIVERSAL | (4 << 2))	/* ... OCTET STRING */
 };

diff --git a/skeletons/NULL.c b/skeletons/NULL.c
@@ -10,7 +10,7 @@
 /*
  * NULL basic type description.
  */
-static ber_tlv_tag_t asn_DEF_NULL_tags[] = {
+static const ber_tlv_tag_t asn_DEF_NULL_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (5 << 2))
 };
 asn_TYPE_descriptor_t asn_DEF_NULL = {

diff --git a/skeletons/NativeEnumerated.c b/skeletons/NativeEnumerated.c
@@ -15,7 +15,7 @@
 /*
  * NativeEnumerated basic type description.
  */
-static ber_tlv_tag_t asn_DEF_NativeEnumerated_tags[] = {
+static const ber_tlv_tag_t asn_DEF_NativeEnumerated_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (10 << 2))
 };
 asn_TYPE_descriptor_t asn_DEF_NativeEnumerated = {
@@ -145,7 +145,7 @@ NativeEnumerated_encode_uper(asn_TYPE_descriptor_t *td,
 	asn_per_constraint_t *ct;
 	int inext = 0;
 	asn_INTEGER_enum_map_t key;
-	asn_INTEGER_enum_map_t *kf;
+	const asn_INTEGER_enum_map_t *kf;
 
 	if(!sptr) _ASN_ENCODE_FAILED;
 	if(!specs) _ASN_ENCODE_FAILED;

diff --git a/skeletons/NativeInteger.c b/skeletons/NativeInteger.c
@@ -16,7 +16,7 @@
 /*
  * NativeInteger basic type description.
  */
-static ber_tlv_tag_t asn_DEF_NativeInteger_tags[] = {
+static const ber_tlv_tag_t asn_DEF_NativeInteger_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (2 << 2))
 };
 asn_TYPE_descriptor_t asn_DEF_NativeInteger = {

diff --git a/skeletons/NativeReal.c b/skeletons/NativeReal.c
@@ -17,7 +17,7 @@
 /*
  * NativeReal basic type description.
  */
-static ber_tlv_tag_t asn_DEF_NativeReal_tags[] = {
+static const ber_tlv_tag_t asn_DEF_NativeReal_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (9 << 2))
 };
 asn_TYPE_descriptor_t asn_DEF_NativeReal = {

diff --git a/skeletons/NumericString.c b/skeletons/NumericString.c
@@ -8,7 +8,7 @@
 /*
  * NumericString basic type description.
  */
-static ber_tlv_tag_t asn_DEF_NumericString_tags[] = {
+static const ber_tlv_tag_t asn_DEF_NumericString_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (18 << 2)),	/* [UNIVERSAL 18] IMPLICIT ...*/
 	(ASN_TAG_CLASS_UNIVERSAL | (4 << 2))	/* ... OCTET STRING */
 };

diff --git a/skeletons/OBJECT_IDENTIFIER.c b/skeletons/OBJECT_IDENTIFIER.c
@@ -12,7 +12,7 @@
 /*
  * OBJECT IDENTIFIER basic type description.
  */
-static ber_tlv_tag_t asn_DEF_OBJECT_IDENTIFIER_tags[] = {
+static const ber_tlv_tag_t asn_DEF_OBJECT_IDENTIFIER_tags[] = {
 	(ASN_TAG_CLASS_UNIVERSAL | (6 << 2))
 };
 asn_TYPE_descriptor_t asn_DEF_OBJECT_IDENTIFIER = {
@@ -65,9 +65,9 @@ OBJECT_IDENTIFIER_constraint(asn_TYPE_descriptor_t *td, const void *sptr,
 
 
 int
-OBJECT_IDENTIFIER_get_single_arc(uint8_t *arcbuf, unsigned int arclen, signed int add, void *rvbufp, unsigned int rvsize) {
+OBJECT_IDENTIFIER_get_single_arc(const uint8_t *arcbuf, unsigned int arclen, signed int add, void *rvbufp, unsigned int rvsize) {
 	unsigned LE GCC_NOTUSED = 1; /* Little endian (x86) */
-	uint8_t *arcend = arcbuf + arclen;	/* End of arc */
+	const uint8_t *arcend = arcbuf + arclen;	/* End of arc */
 	unsigned int cache = 0;	/* No more than 14 significant bits */
 	unsigned char *rvbuf = (unsigned char *)rvbufp;
 	unsigned char *rvstart = rvbuf;	/* Original start of the value buffer */
@@ -181,7 +181,7 @@ OBJECT_IDENTIFIER_get_single_arc(uint8_t *arcbuf, unsigned int arclen, signed in
 }
 
 ssize_t
-OBJECT_IDENTIFIER__dump_arc(uint8_t *arcbuf, int arclen, int add,
+OBJECT_IDENTIFIER__dump_arc(const uint8_t *arcbuf, int arclen, int add,
 		asn_app_consume_bytes_f *cb, void *app_key) {
 	char scratch[64];	/* Conservative estimate */
 	unsigned long accum;	/* Bits accumulator */
@@ -212,7 +212,7 @@ OBJECT_IDENTIFIER__dump_arc(uint8_t *arcbuf, int arclen, int add,
 }
 
 int
-OBJECT_IDENTIFIER_print_arc(uint8_t *arcbuf, int arclen, int add,
+OBJECT_IDENTIFIER_print_arc(const uint8_t *arcbuf, int arclen, int add,
 		asn_app_consume_bytes_f *cb, void *app_key) {
 
 	if(OBJECT_IDENTIFIER__dump_arc(arcbuf, arclen, add, cb, app_key) < 0)
@@ -360,7 +360,7 @@ OBJECT_IDENTIFIER_print(asn_TYPE_descriptor_t *td, const void *sptr,
 }
 
 int
-OBJECT_IDENTIFIER_get_arcs(OBJECT_IDENTIFIER_t *oid, void *arcs,
+OBJECT_IDENTIFIER_get_arcs(const OBJECT_IDENTIFIER_t *oid, void *arcs,
 		unsigned int arc_type_size, unsigned int arc_slots) {
 	void *arcs_end = (char *)arcs + (arc_type_size * arc_slots);
 	int num_arcs = 0;

diff --git a/skeletons/OBJECT_IDENTIFIER.h b/skeletons/OBJECT_IDENTIFIER.h
@@ -68,7 +68,7 @@ xer_type_encoder_f OBJECT_IDENTIFIER_encode_xer;
  * WARNING: The function always returns the real number of arcs,
  * even if there is no sufficient (_arc_slots) provided.
  */
-int OBJECT_IDENTIFIER_get_arcs(OBJECT_IDENTIFIER_t *_oid,
+int OBJECT_IDENTIFIER_get_arcs(const OBJECT_IDENTIFIER_t *_oid,
 	void *_arcs,			/* e.g., unsigned int arcs[N] */
 	unsigned int _arc_type_size,	/* e.g., sizeof(arcs[0]) */
 	unsigned int _arc_slots		/* e.g., N */);
@@ -91,12 +91,12 @@ int OBJECT_IDENTIFIER_set_arcs(OBJECT_IDENTIFIER_t *_oid,
 /*
  * Print the specified OBJECT IDENTIFIER arc.
  */
-int OBJECT_IDENTIFIER_print_arc(uint8_t *arcbuf, int arclen,
+int OBJECT_IDENTIFIER_print_arc(const uint8_t *arcbuf, int arclen,
 	int add, /* Arbitrary offset, required to process the first two arcs */
 	asn_app_consume_bytes_f *cb, void *app_key);
 
 /* Same as above, but returns the number of written digits, instead of 0 */
-ssize_t OBJECT_IDENTIFIER__dump_arc(uint8_t *arcbuf, int arclen, int add,
+ssize_t OBJECT_IDENTIFIER__dump_arc(const uint8_t *arcbuf, int arclen, int add,
 	asn_app_consume_bytes_f *cb, void *app_key);
 
 /*
@@ -127,7 +127,7 @@ int OBJECT_IDENTIFIER_parse_arcs(const char *oid_text, ssize_t oid_txt_length,
  * Internal functions.
  * Used by RELATIVE-OID implementation in particular.
  */
-int OBJECT_IDENTIFIER_get_single_arc(uint8_t *arcbuf, unsigned int arclen,
+int OBJECT_IDENTIFIER_get_single_arc(const uint8_t *arcbuf, unsigned int arclen,
 	signed int add, void *value, unsigned int value_size);
 int OBJECT_IDENTIFIER_set_single_arc(uint8_t *arcbuf,
 	const void *arcval, unsigned int arcval_size, int _prepared_order);