src/shared/strv.h

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

#pragma once

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <stdarg.h>
#include <stdbool.h>

#include "util.h"

char *strv_find(char **l, const char *name) _pure_;
char *strv_find_prefix(char **l, const char *name) _pure_;

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

char **strv_copy(char * const *l);
unsigned strv_length(char * const *l) _pure_;

int strv_extend_strv(char ***a, char **b);
int strv_extend_strv_concat(char ***a, char **b, const char *suffix);
int strv_extend(char ***l, const char *value);
int strv_extendf(char ***l, const char *format, ...) _printf_(2,0);
int strv_push(char ***l, char *value);
int strv_push_prepend(char ***l, char *value);
int strv_consume(char ***l, char *value);
int strv_consume_prepend(char ***l, char *value);

char **strv_remove(char **l, const char *s);
char **strv_uniq(char **l);

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

char **strv_new(const char *x, ...) _sentinel_;
char **strv_new_ap(const char *x, va_list ap);

static inline const char* STRV_IFNOTNULL(const char *x) {
        return x ? x : (const char *) -1;
}

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

char **strv_split(const char *s, const char *separator);
int strv_split_quoted(char ***t, const char *s);
char **strv_split_newlines(const char *s);

char *strv_join(char **l, const char *separator);
char *strv_join_quoted(char **l);

char **strv_parse_nulstr(const char *s, size_t l);
char **strv_split_nulstr(const char *s);

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

#define STRV_FOREACH(s, l)                      \
        for ((s) = (l); (s) && *(s); (s)++)

#define STRV_FOREACH_BACKWARDS(s, l)            \
        STRV_FOREACH(s, l)                      \
                ;                               \
        for ((s)--; (l) && ((s) >= (l)); (s)--)

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

char **strv_sort(char **l);
void strv_print(char **l);

#define STRV_MAKE(...) ((char**) ((const char*[]) { __VA_ARGS__, NULL }))

#define STRV_MAKE_EMPTY ((char*[1]) { NULL })

#define strv_from_stdarg_alloca(first)                          \
        ({                                                      \
                char **_l;                                      \
                                                                \
                if (!first)                                     \
                        _l = (char**) &first;                   \
                else {                                          \
                        unsigned _n;                            \
                        va_list _ap;                            \
                                                                \
                        _n = 1;                                 \
                        va_start(_ap, first);                   \
                        while (va_arg(_ap, char*))              \
                                _n++;                           \
                        va_end(_ap);                            \
                                                                \
                        _l = newa(char*, _n+1);                 \
                        _l[_n = 0] = (char*) first;             \
                        va_start(_ap, first);                   \
                        for (;;) {                              \
                                _l[++_n] = va_arg(_ap, char*);  \
                                if (!_l[_n])                    \
                                        break;                  \
                        }                                       \
                        va_end(_ap);                            \
                }                                               \
                _l;                                             \
        })

#define STR_IN_SET(x, ...) strv_contains(STRV_MAKE(__VA_ARGS__), x)

#define FOREACH_STRING(x, ...)                               \
        for (char **_l = ({                                  \
                char **_ll = STRV_MAKE(__VA_ARGS__);         \
                x = _ll ? _ll[0] : NULL;                     \
                _ll;                                         \
        });                                                  \
        _l && *_l;                                           \
        x = ({                                               \
                _l ++;                                       \
                _l[0];                                       \
        }))