src/basic/env-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2 #pragma once
   3
   4 #include <stdbool.h>
   5 #include <stddef.h>
   6 #include <stdio.h>
   7 #include <unistd.h>
   8
   9 #include "macro.h"
  10 #include "string.h"
  11
  12 static inline size_t sc_arg_max(void) {
  13         long l = sysconf(_SC_ARG_MAX);
  14         assert(l > 0);
  15         return (size_t) l;
  16 }
  17
  18 bool env_name_is_valid(const char *e);
  19 bool env_value_is_valid(const char *e);
  20 bool env_assignment_is_valid(const char *e);
  21
  22 enum {
  23         REPLACE_ENV_USE_ENVIRONMENT = 1 << 0,
  24         REPLACE_ENV_ALLOW_BRACELESS = 1 << 1,
  25         REPLACE_ENV_ALLOW_EXTENDED  = 1 << 2,
  26 };
  27
  28 char *replace_env_n(const char *format, size_t n, char **env, unsigned flags);
  29 char **replace_env_argv(char **argv, char **env);
  30
  31 static inline char *replace_env(const char *format, char **env, unsigned flags) {
  32         return replace_env_n(format, strlen(format), env, flags);
  33 }
  34
  35 bool strv_env_is_valid(char **e);
  36 #define strv_env_clean(l) strv_env_clean_with_callback(l, NULL, NULL)
  37 char **strv_env_clean_with_callback(char **l, void (*invalid_callback)(const char *p, void *userdata), void *userdata);
  38
  39 bool strv_env_name_is_valid(char **l);
  40 bool strv_env_name_or_assignment_is_valid(char **l);
  41
  42 char** _strv_env_merge(char **first, ...);
  43 #define strv_env_merge(first, ...) _strv_env_merge(first, __VA_ARGS__, POINTER_MAX)
  44 char **strv_env_delete(char **x, size_t n_lists, ...); /* New copy */
  45
  46 char **strv_env_unset(char **l, const char *p); /* In place ... */
  47 char **strv_env_unset_many(char **l, ...) _sentinel_;
  48 int strv_env_replace_consume(char ***l, char *p); /* In place ... */
  49 int strv_env_replace_strdup(char ***l, const char *assignment);
  50 int strv_env_assign(char ***l, const char *key, const char *value);
  51
  52 char *strv_env_get_n(char **l, const char *name, size_t k, unsigned flags) _pure_;
  53 char *strv_env_get(char **x, const char *n) _pure_;
  54 char *strv_env_pairs_get(char **l, const char *name) _pure_;
  55
  56 int getenv_bool(const char *p);
  57 int getenv_bool_secure(const char *p);
  58
  59 /* Like setenv, but calls unsetenv if value == NULL. */
  60 int set_unset_env(const char *name, const char *value, bool overwrite);
  61
  62 /* Like putenv, but duplicates the memory like setenv. */
  63 int putenv_dup(const char *assignment, bool override);
  64
  65 int setenv_systemd_exec_pid(bool update_only);
  66
  67 /* Parses and does sanity checks on an environment variable containing
  68  * PATH-like colon-separated absolute paths */
  69 int getenv_path_list(const char *name, char ***ret_paths);