niceSOFT/systemd: The systemd System and Service Manager

src/basic/strv.h
229 строк10 KB
Lennart Poettering
nss-systemd,strv: use a common definition of a non-NULL but empty strv
01 мар 2026, 10:51
01 мар 2026, 10:51d423ec2
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once

#include "basic-forward.h"
#include "strv-fundamental.h"   /* IWYU pragma: export */

char* strv_find(char * const *l, const char *name) _pure_;
char* strv_find_case(char * const *l, const char *name) _pure_;
char* strv_find_prefix(char * const *l, const char *name) _pure_;
char* strv_find_startswith(char * const *l, const char *name) _pure_;
char* strv_find_closest(char * const *l, const char *name) _pure_;
/* Given two vectors, the first a list of keys and the second a list of key-value pairs, returns the value
 * of the first key from the first vector that is found in the second vector. */
char* strv_find_first_field(char * const *needles, char * const *haystack) _pure_;

#define strv_contains(l, s) (!!strv_find((l), (s)))
#define strv_contains_case(l, s) (!!strv_find_case((l), (s)))

char** strv_free(char **l);
DEFINE_TRIVIAL_CLEANUP_FUNC(char**, strv_free);
#define _cleanup_strv_free_ _cleanup_(strv_freep)

char** strv_free_erase(char **l);
DEFINE_TRIVIAL_CLEANUP_FUNC(char**, strv_free_erase);
#define _cleanup_strv_free_erase_ _cleanup_(strv_free_erasep)

void strv_free_many(char ***strvs, size_t n) _nonnull_if_nonzero_(1, 2);

char** strv_copy_n(char * const *l, size_t n);
static inline char** strv_copy(char * const *l) {
        return strv_copy_n(l, SIZE_MAX);
}
int strv_copy_unless_empty(char * const *l, char ***ret);

size_t strv_length(char * const *l) _pure_;

int strv_extend_strv(char ***a, char * const *b, bool filter_duplicates);
int strv_extend_strv_consume(char ***a, char **b, bool filter_duplicates);

int strv_extend_strv_biconcat(char ***a, const char *prefix, const char* const *b, const char *suffix);
static inline int strv_extend_strv_concat(char ***a, const char* const *b, const char *suffix) {
        return strv_extend_strv_biconcat(a, NULL, b, suffix);
}

int strv_prepend(char ***l, const char *value);

/* _with_size() are lower-level functions where the size can be provided externally,
 * which allows us to skip iterating over the strv to find the end, which saves
 * a bit of time and reduces the complexity of appending from O(n²) to O(n). */

int strv_extend_with_size(char ***l, size_t *n, const char *value);
static inline int strv_extend(char ***l, const char *value) {
        return strv_extend_with_size(l, NULL, value);
}

int strv_extend_many_internal(char ***l, const char *value, ...);
#define strv_extend_many(l, ...) strv_extend_many_internal(l, __VA_ARGS__, POINTER_MAX)

int strv_extendf_with_size(char ***l, size_t *n, const char *format, ...) _printf_(3,4);
#define strv_extendf(l, ...) strv_extendf_with_size(l, NULL, __VA_ARGS__)

int strv_extend_joined_with_size_sentinel(char ***l, size_t *n, ...) _sentinel_;
#define strv_extend_joined_with_size(l, n, ...) strv_extend_joined_with_size_sentinel(l, n, __VA_ARGS__, NULL)
#define strv_extend_joined(l, ...) strv_extend_joined_with_size(l, NULL, __VA_ARGS__)

int strv_push_with_size(char ***l, size_t *n, char *value);
static inline int strv_push(char ***l, char *value) {
        return strv_push_with_size(l, NULL, value);
}
int strv_push_pair(char ***l, char *a, char *b);

int strv_insert(char ***l, size_t position, char *value);

static inline int strv_push_prepend(char ***l, char *value) {
        return strv_insert(l, 0, value);
}

int strv_consume_with_size(char ***l, size_t *n, char *value);
static inline int strv_consume(char ***l, char *value) {
        return strv_consume_with_size(l, NULL, value);
}

int strv_consume_pair(char ***l, char *a, char *b);
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) _pure_;

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) _pure_;

char** strv_new_internal(const char *x, ...) _sentinel_;
char** strv_new_ap(const char *x, va_list ap);
#define strv_new(...) strv_new_internal(__VA_ARGS__, NULL)

#define STRV_IGNORE ((const char *) POINTER_MAX)

static inline const char* STRV_IFNOTNULL(const char *x) {
        return x ?: STRV_IGNORE;
}

static inline bool strv_isempty(char * const *l) {
        return !l || !*l;
}

int strv_split_full(char ***t, const char *s, const char *separators, ExtractFlags flags);
char** strv_split(const char *s, const char *separators);

int strv_split_and_extend_full(char ***t, const char *s, const char *separators, bool filter_duplicates, ExtractFlags flags);
int strv_split_and_extend(char ***t, const char *s, const char *separators, bool filter_duplicates);

int strv_split_newlines_full(char ***ret, const char *s, ExtractFlags flags);
char** strv_split_newlines(const char *s);

/* Given a string containing white-space separated tuples of words themselves separated by ':',
 * returns a vector of strings. If the second element in a tuple is missing, the corresponding
 * string in the vector is an empty string. */
int strv_split_colon_pairs(char ***t, const char *s);

char* strv_join_full(char * const *l, const char *separator, const char *prefix, bool escape_separator);
static inline char *strv_join(char * const *l, const char *separator) {
        return strv_join_full(l, separator, NULL, false);
}

bool strv_overlap(char * const *a, char * const *b) _pure_;

#define _STRV_FOREACH_BACKWARDS(s, l, h, i)                             \
        for (typeof(*(l)) *s, *h = (l), *i = ({                         \
                                size_t _len = strv_length(h);           \
                                _len > 0 ? h + _len - 1 : NULL;         \
                        });                                             \
             (s = i);                                                   \
             i = PTR_SUB1(i, h))

#define STRV_FOREACH_BACKWARDS(s, l)                                    \
        _STRV_FOREACH_BACKWARDS(s, l, UNIQ_T(h, UNIQ), UNIQ_T(i, UNIQ))

#define _STRV_FOREACH_PAIR(x, y, l, i)                          \
        for (typeof(*(l)) *x, *y, *i = (l);                     \
             i && *(x = i) && *(y = i + 1);                     \
             i += 2)

#define STRV_FOREACH_PAIR(x, y, l)                      \
        _STRV_FOREACH_PAIR(x, y, l, UNIQ_T(i, UNIQ))

char** strv_sort(char **l);
char** strv_sort_uniq(char **l);
void strv_print_full(char * const *l, const char *prefix);
static inline void strv_print(char * const *l) {
        strv_print_full(l, NULL);
}

char* startswith_strv_internal(const char *s, char * const *l);
#define startswith_strv(s, l) const_generic(s, startswith_strv_internal(s, l))

#define STARTSWITH_SET(p, ...)                                  \
        startswith_strv(p, STRV_MAKE(__VA_ARGS__))

char* endswith_strv_internal(const char *s, char * const *l);
#define endswith_strv(s, l) const_generic(s, endswith_strv_internal(s, l))

#define ENDSWITH_SET(p, ...)                                    \
        endswith_strv(p, STRV_MAKE(__VA_ARGS__))

#define STR_IN_SET(x, ...) strv_contains(STRV_MAKE(__VA_ARGS__), x)
#define STRPTR_IN_SET(x, ...)                                    \
        ({                                                       \
                const char* _x = (x);                            \
                _x && strv_contains(STRV_MAKE(__VA_ARGS__), _x); \
        })

#define STRCASE_IN_SET(x, ...) strv_contains_case(STRV_MAKE(__VA_ARGS__), x)
#define STRCASEPTR_IN_SET(x, ...)                                    \
        ({                                                       \
                const char* _x = (x);                            \
                _x && strv_contains_case(STRV_MAKE(__VA_ARGS__), _x); \
        })

#define _FOREACH_STRING(uniq, x, y, ...)                                \
        for (const char *x, * const*UNIQ_T(l, uniq) = STRV_MAKE_CONST(({ x = y; }), ##__VA_ARGS__); \
             x;                                                         \
             x = *(++UNIQ_T(l, uniq)))

#define FOREACH_STRING(x, y, ...)                       \
        _FOREACH_STRING(UNIQ, x, y, ##__VA_ARGS__)

char** strv_reverse(char **l);
char** strv_shell_escape(char **l, const char *bad);

bool strv_fnmatch_full(char* const* patterns, const char *s, int flags, size_t *ret_matched_pos);
static inline bool strv_fnmatch(char* const* patterns, const char *s) {
        return strv_fnmatch_full(patterns, s, 0, NULL);
}
static inline bool strv_fnmatch_or_empty(char* const* patterns, const char *s, int flags) {
        assert(s);
        return strv_isempty(patterns) ||
               strv_fnmatch_full(patterns, s, flags, NULL);
}

char** strv_skip(char **l, size_t n);

int strv_extend_n(char ***l, const char *value, size_t n);

int strv_extend_assignment(char ***l, const char *lhs, const char *rhs);

int fputstrv(FILE *f, char * const *l, const char *separator, bool *space);

#define strv_free_and_replace(a, b)             \
        free_and_replace_full(a, b, strv_free)

void string_strv_hashmap_remove(Hashmap *h, const char *key, const char *value);
void string_strv_ordered_hashmap_remove(OrderedHashmap *h, const char *key, const char *value);
int string_strv_hashmap_put(Hashmap **h, const char *key, const char *value);
int string_strv_ordered_hashmap_put(OrderedHashmap **h, const char *key, const char *value);

int strv_rebreak_lines(char **l, size_t width, char ***ret);

char** strv_filter_prefix(char * const *l, const char *prefix);

/* whenever we need to initialize something with a constant non-NULL, but empty strv, we can use this shared
 * one */
extern const char* const strv_empty[1];

#define STRV_EMPTY ((char**) strv_empty)