basic,shared: mark eligible functions with _pure_/_const_

Following the recent witch hunt done to static inline functions
I figure we should at least give the compiler some more hint
on optimizations.

src/basic/af-list.h

@@ -8,7 +8,7 @@ int af_from_name(const char *name) _pure_;
 
 const char* af_to_name_short(int id) _const_;
 
-const char* af_to_ipv4_ipv6(int id);
-int af_from_ipv4_ipv6(const char *af);
+const char* af_to_ipv4_ipv6(int id) _const_;
+int af_from_ipv4_ipv6(const char *af) _pure_;
 
-int af_max(void);
+int af_max(void) _const_;

src/basic/arphrd-util.h

@@ -3,7 +3,7 @@
 
 #include "forward.h"
 
-const char* arphrd_to_name(int id);
-int arphrd_from_name(const char *name);
+const char* arphrd_to_name(int id) _const_;
+int arphrd_from_name(const char *name) _pure_;
 
-size_t arphrd_to_hw_addr_len(uint16_t arphrd);
+size_t arphrd_to_hw_addr_len(uint16_t arphrd) _const_;

src/basic/errno-list.h

@@ -3,7 +3,7 @@
 
 #include "forward.h"
 
-const char* errno_to_name(int id);
+const char* errno_to_name(int id) _const_;
 int errno_from_name(const char *name) _pure_;
 
 static inline bool errno_is_valid(int n) {

src/basic/in-addr-util.h

@@ -16,15 +16,15 @@ struct in_addr_data {
         union in_addr_union address;
 };
 
-bool in4_addr_is_null(const struct in_addr *a);
+bool in4_addr_is_null(const struct in_addr *a) _pure_;
 static inline bool in4_addr_is_set(const struct in_addr *a) {
         return !in4_addr_is_null(a);
 }
-bool in6_addr_is_null(const struct in6_addr *a);
+bool in6_addr_is_null(const struct in6_addr *a) _pure_;
 static inline bool in6_addr_is_set(const struct in6_addr *a) {
         return !in6_addr_is_null(a);
 }
-int in_addr_is_null(int family, const union in_addr_union *u);
+int in_addr_is_null(int family, const union in_addr_union *u) _pure_;
 static inline bool in_addr_is_set(int family, const union in_addr_union *u) {
         return in_addr_is_null(family, u) == 0;
 }
@@ -36,43 +36,43 @@ static inline bool in_addr_data_is_set(const struct in_addr_data *a) {
         return in_addr_data_is_null(a);
 }
 
-bool in4_addr_is_multicast(const struct in_addr *a);
-bool in6_addr_is_multicast(const struct in6_addr *a);
-int in_addr_is_multicast(int family, const union in_addr_union *u);
+bool in4_addr_is_multicast(const struct in_addr *a) _pure_;
+bool in6_addr_is_multicast(const struct in6_addr *a) _pure_;
+int in_addr_is_multicast(int family, const union in_addr_union *u) _pure_;
 
-bool in4_addr_is_link_local(const struct in_addr *a);
-bool in4_addr_is_link_local_dynamic(const struct in_addr *a);
-bool in6_addr_is_link_local(const struct in6_addr *a);
-int in_addr_is_link_local(int family, const union in_addr_union *u);
-bool in6_addr_is_link_local_all_nodes(const struct in6_addr *a);
+bool in4_addr_is_link_local(const struct in_addr *a) _pure_;
+bool in4_addr_is_link_local_dynamic(const struct in_addr *a) _pure_;
+bool in6_addr_is_link_local(const struct in6_addr *a) _pure_;
+int in_addr_is_link_local(int family, const union in_addr_union *u) _pure_;
+bool in6_addr_is_link_local_all_nodes(const struct in6_addr *a) _pure_;
 
-bool in4_addr_is_localhost(const struct in_addr *a);
-int in_addr_is_localhost(int family, const union in_addr_union *u);
-int in_addr_is_localhost_one(int family, const union in_addr_union *u);
+bool in4_addr_is_localhost(const struct in_addr *a) _pure_;
+int in_addr_is_localhost(int family, const union in_addr_union *u) _pure_;
+int in_addr_is_localhost_one(int family, const union in_addr_union *u) _pure_;
 
-bool in4_addr_is_local_multicast(const struct in_addr *a);
-bool in4_addr_is_non_local(const struct in_addr *a);
-bool in6_addr_is_ipv4_mapped_address(const struct in6_addr *a);
+bool in4_addr_is_local_multicast(const struct in_addr *a) _pure_;
+bool in4_addr_is_non_local(const struct in_addr *a) _pure_;
+bool in6_addr_is_ipv4_mapped_address(const struct in6_addr *a) _pure_;
 
-bool in4_addr_equal(const struct in_addr *a, const struct in_addr *b);
-bool in6_addr_equal(const struct in6_addr *a, const struct in6_addr *b);
-int in_addr_equal(int family, const union in_addr_union *a, const union in_addr_union *b);
+bool in4_addr_equal(const struct in_addr *a, const struct in_addr *b) _pure_;
+bool in6_addr_equal(const struct in6_addr *a, const struct in6_addr *b) _pure_;
+int in_addr_equal(int family, const union in_addr_union *a, const union in_addr_union *b) _pure_;
 bool in4_addr_prefix_intersect(
                 const struct in_addr *a,
                 unsigned aprefixlen,
                 const struct in_addr *b,
-                unsigned bprefixlen);
+                unsigned bprefixlen) _pure_;
 bool in6_addr_prefix_intersect(
                 const struct in6_addr *a,
                 unsigned aprefixlen,
                 const struct in6_addr *b,
-                unsigned bprefixlen);
+                unsigned bprefixlen) _pure_;
 int in_addr_prefix_intersect(
                 int family,
                 const union in_addr_union *a,
                 unsigned aprefixlen,
                 const union in_addr_union *b,
-                unsigned bprefixlen);
+                unsigned bprefixlen) _pure_;
 int in_addr_prefix_next(int family, union in_addr_union *u, unsigned prefixlen);
 int in_addr_prefix_nth(int family, union in_addr_union *u, unsigned prefixlen, uint64_t nth);
 int in_addr_random_prefix(int family, union in_addr_union *u, unsigned prefixlen_fixed_part, unsigned prefixlen);

src/basic/path-util.h

@@ -158,14 +158,14 @@ int file_in_same_dir(const char *path, const char *filename, char **ret);
 
 bool hidden_or_backup_file(const char *filename) _pure_;
 
-bool is_device_path(const char *path);
+bool is_device_path(const char *path) _pure_;
 
-bool valid_device_node_path(const char *path);
-bool valid_device_allow_pattern(const char *path);
+bool valid_device_node_path(const char *path) _pure_;
+bool valid_device_allow_pattern(const char *path) _pure_;
 
-bool dot_or_dot_dot(const char *path);
+bool dot_or_dot_dot(const char *path) _pure_;
 
-bool path_implies_directory(const char *path);
+bool path_implies_directory(const char *path) _pure_;
 
 static inline const char* skip_dev_prefix(const char *p) {
         const char *e;
@@ -177,7 +177,7 @@ static inline const char* skip_dev_prefix(const char *p) {
         return e ?: p;
 }
 
-bool empty_or_root(const char *path);
+bool empty_or_root(const char *path) _pure_;
 const char* empty_to_root(const char *path) _pure_;
 
 bool path_strv_contains(char * const *l, const char *path);

src/basic/process-util.h

@@ -136,7 +136,7 @@ void valgrind_summary_hack(void);
 
 int pid_compare_func(const pid_t *a, const pid_t *b);
 
-bool nice_is_valid(int n);
+bool nice_is_valid(int n) _const_;
 
 bool sched_policy_is_valid(int i) _const_;
 bool sched_priority_is_valid(int i) _const_;

src/basic/sha256.h

@@ -9,4 +9,4 @@ int sha256_fd(int fd, uint64_t max_size, uint8_t ret[static SHA256_DIGEST_SIZE])
 
 int parse_sha256(const char *s, uint8_t res[static SHA256_DIGEST_SIZE]);
 
-bool sha256_is_valid(const char *s);
+bool sha256_is_valid(const char *s) _pure_;

src/basic/socket-util.h

@@ -136,12 +136,12 @@ typedef enum {
         IFNAME_VALID_SPECIAL     = 1 << 2, /* Allow the special names "all" and "default" */
         _IFNAME_VALID_ALL        = IFNAME_VALID_ALTERNATIVE | IFNAME_VALID_NUMERIC | IFNAME_VALID_SPECIAL,
 } IfnameValidFlags;
-bool ifname_valid_char(char a);
-bool ifname_valid_full(const char *p, IfnameValidFlags flags);
+bool ifname_valid_char(char a) _const_;
+bool ifname_valid_full(const char *p, IfnameValidFlags flags) _pure_;
 static inline bool ifname_valid(const char *p) {
         return ifname_valid_full(p, 0);
 }
-bool address_label_valid(const char *p);
+bool address_label_valid(const char *p) _pure_;
 
 int getpeercred(int fd, struct ucred *ucred);
 int getpeersec(int fd, char **ret);

src/basic/stat-util.h

@@ -85,15 +85,15 @@ bool statx_mount_same(const struct statx *a, const struct statx *b);
 
 int xstatfsat(int dir_fd, const char *path, struct statfs *ret);
 
-usec_t statx_timestamp_load(const struct statx_timestamp *ts);
-nsec_t statx_timestamp_load_nsec(const struct statx_timestamp *ts);
+usec_t statx_timestamp_load(const struct statx_timestamp *ts) _pure_;
+nsec_t statx_timestamp_load_nsec(const struct statx_timestamp *ts) _pure_;
 
 void inode_hash_func(const struct stat *q, struct siphash *state);
 int inode_compare_func(const struct stat *a, const struct stat *b);
 extern const struct hash_ops inode_hash_ops;
 
-const char* inode_type_to_string(mode_t m);
-mode_t inode_type_from_string(const char *s);
+const char* inode_type_to_string(mode_t m) _const_;
+mode_t inode_type_from_string(const char *s) _pure_;
 
 /* Macros that check whether the stat/statx structures have been initialized already. For "struct stat" we
  * use a check for .st_dev being non-zero, since the kernel unconditionally fills that in, mapping the file

src/basic/string-util.h

@@ -124,11 +124,11 @@ static inline char* skip_leading_chars(const char *s, const char *bad) {
         return (char*) s + strspn(s, bad);
 }
 
-char ascii_tolower(char x);
+char ascii_tolower(char x) _const_;
 char* ascii_strlower(char *s);
 char* ascii_strlower_n(char *s, size_t n);
 
-char ascii_toupper(char x);
+char ascii_toupper(char x) _const_;
 char* ascii_strupper(char *s);
 
 int ascii_strcasecmp_n(const char *a, const char *b, size_t n);
@@ -257,7 +257,7 @@ typedef enum MakeCStringMode {
 
 int make_cstring(const char *s, size_t n, MakeCStringMode mode, char **ret);
 
-size_t strspn_from_end(const char *str, const char *accept);
+size_t strspn_from_end(const char *str, const char *accept) _pure_;
 
 char* strdupspn(const char *a, const char *accept);
 char* strdupcspn(const char *a, const char *reject);
@@ -279,12 +279,11 @@ char* find_line_startswith(const char *haystack, const char *needle);
 char* find_line(const char *haystack, const char *needle);
 char* find_line_after(const char *haystack, const char *needle);
 
-bool version_is_valid(const char *s);
-
-bool version_is_valid_versionspec(const char *s);
+bool version_is_valid(const char *s) _pure_;
+bool version_is_valid_versionspec(const char *s) _pure_;
 
 ssize_t strlevenshtein(const char *x, const char *y);
 
-char* strrstr(const char *haystack, const char *needle);
+char* strrstr(const char *haystack, const char *needle) _pure_;
 
-size_t str_common_prefix(const char *a, const char *b);
+size_t str_common_prefix(const char *a, const char *b) _pure_;

src/basic/strv.h

@@ -80,14 +80,14 @@ int strv_consume_prepend(char ***l, char *value);
 
 char** strv_remove(char **l, const char *s);
 char** strv_uniq(char **l);
-bool strv_is_uniq(char * const *l);
+bool strv_is_uniq(char * const *l) _pure_;
 
-int strv_compare(char * const *a, char * const *b);
+int strv_compare(char * const *a, char * const *b) _pure_;
 static inline bool strv_equal(char * const *a, char * const *b) {
         return strv_compare(a, b) == 0;
 }
 
-bool strv_equal_ignore_order(char * const *a, char * const *b);
+bool strv_equal_ignore_order(char * const *a, char * const *b) _pure_;
 
 char** strv_new_internal(const char *x, ...) _sentinel_;
 char** strv_new_ap(const char *x, va_list ap);

src/basic/user-util.h

@@ -18,7 +18,7 @@
 #define MAP_UID_MIN ((uid_t) 60514)
 #define MAP_UID_MAX ((uid_t) 60577)
 
-bool uid_is_valid(uid_t uid);
+bool uid_is_valid(uid_t uid) _const_;
 
 static inline bool gid_is_valid(gid_t gid) {
         return uid_is_valid((uid_t) gid);
@@ -37,8 +37,7 @@ char* getusername_malloc(void);
 const char* default_root_shell_at(int rfd);
 const char* default_root_shell(const char *root);
 
-bool is_nologin_shell(const char *shell);
-
+bool is_nologin_shell(const char *shell) _pure_;
 bool shell_is_placeholder(const char *shell) _pure_;
 
 typedef enum UserCredsFlags {

src/basic/utf8.h

@@ -6,7 +6,7 @@
 #define UTF8_REPLACEMENT_CHARACTER "\xef\xbf\xbd"
 #define UTF8_BYTE_ORDER_MARK "\xef\xbb\xbf"
 
-bool unichar_is_valid(char32_t c);
+bool unichar_is_valid(char32_t c) _const_;
 
 char* utf8_is_valid_n(const char *str, size_t len_bytes) _pure_;
 static inline char* utf8_is_valid(const char *str) {
@@ -35,10 +35,10 @@ size_t utf16_encode_unichar(char16_t *out, char32_t c);
 char* utf16_to_utf8(const char16_t *s, size_t length /* bytes! */);
 char16_t *utf8_to_utf16(const char *s, size_t length);
 
-size_t char16_strlen(const char16_t *s); /* returns the number of 16-bit words in the string (not bytes!) */
-size_t char16_strsize(const char16_t *s);
+size_t char16_strlen(const char16_t *s) _pure_; /* returns the number of 16-bit words in the string (not bytes!) */
+size_t char16_strsize(const char16_t *s) _pure_;
 
-int utf8_encoded_valid_unichar(const char *str, size_t length);
+int utf8_encoded_valid_unichar(const char *str, size_t length) _pure_;
 int utf8_encoded_to_unichar(const char *str, char32_t *ret_unichar);
 
 static inline bool utf16_is_surrogate(char16_t c) {
@@ -53,8 +53,8 @@ static inline char32_t utf16_surrogate_pair_to_unichar(char16_t lead, char16_t t
         return ((((char32_t) lead - 0xd800U) << 10) + ((char32_t) trail - 0xdc00U) + 0x10000U);
 }
 
-size_t utf8_n_codepoints(const char *str);
-int utf8_char_console_width(const char *str);
-size_t utf8_console_width(const char *str);
+size_t utf8_n_codepoints(const char *str) _pure_;
+int utf8_char_console_width(const char *str) _pure_;
+size_t utf8_console_width(const char *str) _pure_;
 
-size_t utf8_last_length(const char *s, size_t n);
+size_t utf8_last_length(const char *s, size_t n) _pure_;