*: add "noexcept" to many, many function prototypes

This eliminates some overhead, because the compiler doesn't need to
consider these functions throwing.

src/tag/Format.cxx

@@ -53,7 +53,7 @@ IsUnsafeChar(char ch)
 
 gcc_pure
 static bool
-HasUnsafeChar(const char *s)
+HasUnsafeChar(const char *s) noexcept
 {
 	for (; *s; ++s)
 		if (IsUnsafeChar(*s))
@@ -63,7 +63,7 @@ HasUnsafeChar(const char *s)
 }
 
 static const char *
-SanitizeString(const char *s, char *buffer, size_t buffer_size)
+SanitizeString(const char *s, char *buffer, size_t buffer_size) noexcept
 {
 	/* skip leading dots to avoid generating "../" sequences */
 	while (*s == '.')
@@ -79,7 +79,7 @@ SanitizeString(const char *s, char *buffer, size_t buffer_size)
 
 gcc_pure gcc_nonnull_all
 static const char *
-TagGetter(const void *object, const char *name)
+TagGetter(const void *object, const char *name) noexcept
 {
 	const auto &_ctx = *(const FormatTagContext *)object;
 	auto &ctx = const_cast<FormatTagContext &>(_ctx);
@@ -126,7 +126,7 @@ TagGetter(const void *object, const char *name)
 }
 
 char *
-FormatTag(const Tag &tag, const char *format)
+FormatTag(const Tag &tag, const char *format) noexcept
 {
 	FormatTagContext ctx(tag);
 	return format_object(format, &ctx, TagGetter);

src/tag/Format.hxx

@@ -27,6 +27,6 @@ struct Tag;
 
 gcc_malloc gcc_nonnull_all
 char *
-FormatTag(const Tag &tag, const char *format);
+FormatTag(const Tag &tag, const char *format) noexcept;
 
 #endif

src/tag/Id3Load.cxx

@@ -33,7 +33,7 @@ static constexpr size_t ID3V1_SIZE = 128;
 
 gcc_pure
 static inline bool
-tag_is_id3v1(struct id3_tag *tag)
+tag_is_id3v1(struct id3_tag *tag) noexcept
 {
 	return (id3_tag_options(tag, 0, 0) & ID3_TAG_OPTION_ID3V1) != 0;
 }

src/tag/Settings.hxx

@@ -28,14 +28,14 @@ extern tag_mask_t global_tag_mask;
 
 gcc_const
 static inline bool
-IsTagEnabled(unsigned tag)
+IsTagEnabled(unsigned tag) noexcept
 {
 	return global_tag_mask & (1u << tag);
 }
 
 gcc_const
 static inline bool
-IsTagEnabled(TagType tag)
+IsTagEnabled(TagType tag) noexcept
 {
 	return IsTagEnabled(unsigned(tag));
 }

src/tag/Tag.cxx

@@ -27,7 +27,7 @@
 #include <string.h>
 
 TagType
-tag_name_parse(const char *name)
+tag_name_parse(const char *name) noexcept
 {
 	assert(name != nullptr);
 
@@ -42,7 +42,7 @@ tag_name_parse(const char *name)
 }
 
 TagType
-tag_name_parse_i(const char *name)
+tag_name_parse_i(const char *name) noexcept
 {
 	assert(name != nullptr);
 
@@ -112,7 +112,7 @@ Tag::MergeReplace(Tag *base, Tag *add)
 }
 
 const char *
-Tag::GetValue(TagType type) const
+Tag::GetValue(TagType type) const noexcept
 {
 	assert(type < TAG_NUM_OF_ITEM_TYPES);
 
@@ -124,7 +124,7 @@ Tag::GetValue(TagType type) const
 }
 
 bool
-Tag::HasType(TagType type) const
+Tag::HasType(TagType type) const noexcept
 {
 	return GetValue(type) != nullptr;
 }

src/tag/Tag.hxx

@@ -133,14 +133,14 @@ struct Tag {
 	 * nullptr if none is present in this tag object.
 	 */
 	gcc_pure
-	const char *GetValue(TagType type) const;
+	const char *GetValue(TagType type) const noexcept;
 
 	/**
 	 * Checks whether the tag contains one or more items with
 	 * the specified type.
 	 */
 	gcc_pure
-	bool HasType(TagType type) const;
+	bool HasType(TagType type) const noexcept;
 
 	class const_iterator {
 		friend struct Tag;
@@ -202,7 +202,7 @@ struct Tag {
  */
 gcc_pure
 TagType
-tag_name_parse(const char *name);
+tag_name_parse(const char *name) noexcept;
 
 /**
  * Parse the string, and convert it into a #TagType.  Returns
@@ -212,6 +212,6 @@ tag_name_parse(const char *name);
  */
 gcc_pure
 TagType
-tag_name_parse_i(const char *name);
+tag_name_parse_i(const char *name) noexcept;
 
 #endif

src/tag/TagBuilder.cxx

@@ -153,7 +153,7 @@ TagBuilder::CommitNew()
 }
 
 bool
-TagBuilder::HasType(TagType type) const
+TagBuilder::HasType(TagType type) const noexcept
 {
 	for (auto i : items)
 		if (i->type == type)
@@ -237,7 +237,7 @@ TagBuilder::AddEmptyItem(TagType type)
 }
 
 void
-TagBuilder::RemoveAll()
+TagBuilder::RemoveAll() noexcept
 {
 	tag_pool_lock.lock();
 	for (auto i : items)
@@ -248,7 +248,7 @@ TagBuilder::RemoveAll()
 }
 
 void
-TagBuilder::RemoveType(TagType type)
+TagBuilder::RemoveType(TagType type) noexcept
 {
 	const auto begin = items.begin(), end = items.end();
 

src/tag/TagBuilder.hxx

@@ -124,7 +124,7 @@ public:
 	 * the specified type.
 	 */
 	gcc_pure
-	bool HasType(TagType type) const;
+	bool HasType(TagType type) const noexcept;
 
 	/**
 	 * Copy attributes and items from the other object that do not
@@ -161,12 +161,12 @@ public:
 	/**
 	 * Removes all tag items.
 	 */
-	void RemoveAll();
+	void RemoveAll() noexcept;
 
 	/**
 	 * Removes all tag items of the specified type.
 	 */
-	void RemoveType(TagType type);
+	void RemoveType(TagType type) noexcept;
 
 private:
 	gcc_nonnull_all

src/tag/TagId3.cxx

@@ -57,7 +57,7 @@
 
 gcc_pure
 static id3_utf8_t *
-tag_id3_getstring(const struct id3_frame *frame, unsigned i)
+tag_id3_getstring(const struct id3_frame *frame, unsigned i) noexcept
 {
 	id3_field *field = id3_frame_field(frame, i);
 	if (field == nullptr)
@@ -203,7 +203,7 @@ tag_id3_import_comment(struct id3_tag *tag, const char *id, TagType type,
  */
 gcc_pure
 static TagType
-tag_id3_parse_txxx_name(const char *name)
+tag_id3_parse_txxx_name(const char *name) noexcept
 {
 	static constexpr struct tag_table txxx_tags[] = {
 		{ "ALBUMARTISTSORT", TAG_ALBUM_ARTIST_SORT },

src/tag/TagString.cxx

@@ -29,7 +29,7 @@
 
 gcc_pure
 static const char *
-FindInvalidUTF8(const char *p, const char *const end)
+FindInvalidUTF8(const char *p, const char *const end) noexcept
 {
 	while (p < end) {
 		const size_t s = SequenceLengthUTF8(*p);

src/tag/TagTable.cxx

@@ -28,7 +28,7 @@
  * in the table.
  */
 TagType
-tag_table_lookup(const struct tag_table *table, const char *name)
+tag_table_lookup(const struct tag_table *table, const char *name) noexcept
 {
 	for (; table->name != nullptr; ++table)
 		if (strcmp(name, table->name) == 0)
@@ -43,7 +43,7 @@ tag_table_lookup(const struct tag_table *table, const char *name)
  * in the table.
  */
 TagType
-tag_table_lookup_i(const struct tag_table *table, const char *name)
+tag_table_lookup_i(const struct tag_table *table, const char *name) noexcept
 {
 	for (; table->name != nullptr; ++table)
 		if (StringEqualsCaseASCII(name, table->name))
@@ -53,7 +53,7 @@ tag_table_lookup_i(const struct tag_table *table, const char *name)
 }
 
 const char *
-tag_table_lookup(const tag_table *table, TagType type)
+tag_table_lookup(const tag_table *table, TagType type) noexcept
 {
 	for (; table->name != nullptr; ++table)
 		if (table->type == type)

src/tag/TagTable.hxx

@@ -36,7 +36,7 @@ struct tag_table {
  */
 gcc_pure
 TagType
-tag_table_lookup(const tag_table *table, const char *name);
+tag_table_lookup(const tag_table *table, const char *name) noexcept;
 
 /**
  * Looks up a string in a tag translation table (case insensitive).
@@ -45,7 +45,7 @@ tag_table_lookup(const tag_table *table, const char *name);
  */
 gcc_pure
 TagType
-tag_table_lookup_i(const tag_table *table, const char *name);
+tag_table_lookup_i(const tag_table *table, const char *name) noexcept;
 
 /**
  * Looks up a #TagType in a tag translation table and returns its
@@ -54,6 +54,6 @@ tag_table_lookup_i(const tag_table *table, const char *name);
  */
 gcc_pure
 const char *
-tag_table_lookup(const tag_table *table, TagType type);
+tag_table_lookup(const tag_table *table, TagType type) noexcept;
 
 #endif

src/tag/VorbisComment.cxx

@@ -25,7 +25,7 @@
 #include <string.h>
 
 const char *
-vorbis_comment_value(const char *entry, const char *name)
+vorbis_comment_value(const char *entry, const char *name) noexcept
 {
 	assert(entry != nullptr);
 	assert(name != nullptr);

src/tag/VorbisComment.hxx

@@ -29,6 +29,6 @@
  */
 gcc_pure
 const char *
-vorbis_comment_value(const char *entry, const char *name);
+vorbis_comment_value(const char *entry, const char *name) noexcept;
 
 #endif