src/shared/util.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #pragma once
   4
   5 /***
   6   This file is part of systemd.
   7
   8   Copyright 2010 Lennart Poettering
   9
  10   systemd is free software; you can redistribute it and/or modify it
  11   under the terms of the GNU Lesser General Public License as published by
  12   the Free Software Foundation; either version 2.1 of the License, or
  13   (at your option) any later version.
  14
  15   systemd is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18   Lesser General Public License for more details.
  19
  20   You should have received a copy of the GNU Lesser General Public License
  21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  22 ***/
  23
  24 #include <alloca.h>
  25 #include <inttypes.h>
  26 #include <time.h>
  27 #include <sys/time.h>
  28 #include <stdarg.h>
  29 #include <stdbool.h>
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #include <signal.h>
  33 #include <sched.h>
  34 #include <limits.h>
  35 #include <sys/types.h>
  36 #include <sys/stat.h>
  37 #include <dirent.h>
  38 #include <sys/resource.h>
  39 #include <stddef.h>
  40 #include <unistd.h>
  41 #include <locale.h>
  42 #include <mntent.h>
  43
  44 #include "macro.h"
  45 #include "time-util.h"
  46
  47 union dirent_storage {
  48         struct dirent de;
  49         uint8_t storage[offsetof(struct dirent, d_name) +
  50                         ((NAME_MAX + 1 + sizeof(long)) & ~(sizeof(long) - 1))];
  51 };
  52
  53 /* What is interpreted as whitespace? */
  54 #define WHITESPACE " \t\n\r"
  55 #define NEWLINE "\n\r"
  56 #define QUOTES "\"\'"
  57 #define COMMENTS "#;"
  58
  59 #define FORMAT_BYTES_MAX 8
  60
  61 #define ANSI_HIGHLIGHT_ON "\x1B[1;39m"
  62 #define ANSI_RED_ON "\x1B[31m"
  63 #define ANSI_HIGHLIGHT_RED_ON "\x1B[1;31m"
  64 #define ANSI_GREEN_ON "\x1B[32m"
  65 #define ANSI_HIGHLIGHT_GREEN_ON "\x1B[1;32m"
  66 #define ANSI_HIGHLIGHT_YELLOW_ON "\x1B[1;33m"
  67 #define ANSI_HIGHLIGHT_OFF "\x1B[0m"
  68 #define ANSI_ERASE_TO_END_OF_LINE "\x1B[K"
  69
  70 size_t page_size(void);
  71 #define PAGE_ALIGN(l) ALIGN_TO((l), page_size())
  72
  73 #define streq(a,b) (strcmp((a),(b)) == 0)
  74 #define strneq(a, b, n) (strncmp((a), (b), (n)) == 0)
  75 #define strcaseeq(a,b) (strcasecmp((a),(b)) == 0)
  76 #define strncaseeq(a, b, n) (strncasecmp((a), (b), (n)) == 0)
  77
  78 bool streq_ptr(const char *a, const char *b) _pure_;
  79
  80 #define new(t, n) ((t*) malloc_multiply(sizeof(t), (n)))
  81
  82 #define new0(t, n) ((t*) calloc((n), sizeof(t)))
  83
  84 #define newa(t, n) ((t*) alloca(sizeof(t)*(n)))
  85
  86 #define newdup(t, p, n) ((t*) memdup_multiply(p, sizeof(t), (n)))
  87
  88 #define malloc0(n) (calloc((n), 1))
  89
  90 static inline const char* yes_no(bool b) {
  91         return b ? "yes" : "no";
  92 }
  93
  94 static inline const char* strempty(const char *s) {
  95         return s ? s : "";
  96 }
  97
  98 static inline const char* strnull(const char *s) {
  99         return s ? s : "(null)";
 100 }
 101
 102 static inline const char *strna(const char *s) {
 103         return s ? s : "n/a";
 104 }
 105
 106 static inline bool isempty(const char *p) {
 107         return !p || !p[0];
 108 }
 109
 110 static inline const char *startswith(const char *s, const char *prefix) {
 111         if (strncmp(s, prefix, strlen(prefix)) == 0)
 112                 return s + strlen(prefix);
 113         return NULL;
 114 }
 115
 116 static inline const char *startswith_no_case(const char *s, const char *prefix) {
 117         if (strncasecmp(s, prefix, strlen(prefix)) == 0)
 118                 return s + strlen(prefix);
 119         return NULL;
 120 }
 121
 122 char *endswith(const char *s, const char *postfix) _pure_;
 123
 124 bool first_word(const char *s, const char *word) _pure_;
 125
 126 int close_nointr(int fd);
 127 void close_nointr_nofail(int fd);
 128 void close_many(const int fds[], unsigned n_fd);
 129
 130 int parse_boolean(const char *v) _pure_;
 131 int parse_bytes(const char *t, off_t *bytes);
 132 int parse_pid(const char *s, pid_t* ret_pid);
 133 int parse_uid(const char *s, uid_t* ret_uid);
 134 #define parse_gid(s, ret_uid) parse_uid(s, ret_uid)
 135
 136 int safe_atou(const char *s, unsigned *ret_u);
 137 int safe_atoi(const char *s, int *ret_i);
 138
 139 int safe_atollu(const char *s, unsigned long long *ret_u);
 140 int safe_atolli(const char *s, long long int *ret_i);
 141
 142 int safe_atod(const char *s, double *ret_d);
 143
 144 #if __WORDSIZE == 32
 145 static inline int safe_atolu(const char *s, unsigned long *ret_u) {
 146         assert_cc(sizeof(unsigned long) == sizeof(unsigned));
 147         return safe_atou(s, (unsigned*) ret_u);
 148 }
 149 static inline int safe_atoli(const char *s, long int *ret_u) {
 150         assert_cc(sizeof(long int) == sizeof(int));
 151         return safe_atoi(s, (int*) ret_u);
 152 }
 153 #else
 154 static inline int safe_atolu(const char *s, unsigned long *ret_u) {
 155         assert_cc(sizeof(unsigned long) == sizeof(unsigned long long));
 156         return safe_atollu(s, (unsigned long long*) ret_u);
 157 }
 158 static inline int safe_atoli(const char *s, long int *ret_u) {
 159         assert_cc(sizeof(long int) == sizeof(long long int));
 160         return safe_atolli(s, (long long int*) ret_u);
 161 }
 162 #endif
 163
 164 static inline int safe_atou32(const char *s, uint32_t *ret_u) {
 165         assert_cc(sizeof(uint32_t) == sizeof(unsigned));
 166         return safe_atou(s, (unsigned*) ret_u);
 167 }
 168
 169 static inline int safe_atoi32(const char *s, int32_t *ret_i) {
 170         assert_cc(sizeof(int32_t) == sizeof(int));
 171         return safe_atoi(s, (int*) ret_i);
 172 }
 173
 174 static inline int safe_atou64(const char *s, uint64_t *ret_u) {
 175         assert_cc(sizeof(uint64_t) == sizeof(unsigned long long));
 176         return safe_atollu(s, (unsigned long long*) ret_u);
 177 }
 178
 179 static inline int safe_atoi64(const char *s, int64_t *ret_i) {
 180         assert_cc(sizeof(int64_t) == sizeof(long long int));
 181         return safe_atolli(s, (long long int*) ret_i);
 182 }
 183
 184 char *split(const char *c, size_t *l, const char *separator, char **state);
 185 char *split_quoted(const char *c, size_t *l, char **state);
 186
 187 #define FOREACH_WORD(word, length, s, state)                            \
 188         for ((state) = NULL, (word) = split((s), &(length), WHITESPACE, &(state)); (word); (word) = split((s), &(length), WHITESPACE, &(state)))
 189
 190 #define FOREACH_WORD_SEPARATOR(word, length, s, separator, state)       \
 191         for ((state) = NULL, (word) = split((s), &(length), (separator), &(state)); (word); (word) = split((s), &(length), (separator), &(state)))
 192
 193 #define FOREACH_WORD_QUOTED(word, length, s, state)                     \
 194         for ((state) = NULL, (word) = split_quoted((s), &(length), &(state)); (word); (word) = split_quoted((s), &(length), &(state)))
 195
 196 pid_t get_parent_of_pid(pid_t pid, pid_t *ppid);
 197 int get_starttime_of_pid(pid_t pid, unsigned long long *st);
 198
 199 char *strappend(const char *s, const char *suffix);
 200 char *strnappend(const char *s, const char *suffix, size_t length);
 201
 202 char *replace_env(const char *format, char **env);
 203 char **replace_env_argv(char **argv, char **env);
 204
 205 int readlink_malloc(const char *p, char **r);
 206 int readlink_and_make_absolute(const char *p, char **r);
 207 int readlink_and_canonicalize(const char *p, char **r);
 208
 209 int reset_all_signal_handlers(void);
 210
 211 char *strstrip(char *s);
 212 char *delete_chars(char *s, const char *bad);
 213 char *truncate_nl(char *s);
 214
 215 char *file_in_same_dir(const char *path, const char *filename);
 216
 217 int rmdir_parents(const char *path, const char *stop);
 218
 219 int get_process_comm(pid_t pid, char **name);
 220 int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line);
 221 int get_process_exe(pid_t pid, char **name);
 222 int get_process_uid(pid_t pid, uid_t *uid);
 223 int get_process_gid(pid_t pid, gid_t *gid);
 224 int get_process_capeff(pid_t pid, char **capeff);
 225
 226 char hexchar(int x) _const_;
 227 int unhexchar(char c) _const_;
 228 char octchar(int x) _const_;
 229 int unoctchar(char c) _const_;
 230 char decchar(int x) _const_;
 231 int undecchar(char c) _const_;
 232
 233 char *cescape(const char *s);
 234 char *cunescape(const char *s);
 235 char *cunescape_length(const char *s, size_t length);
 236 char *cunescape_length_with_prefix(const char *s, size_t length, const char *prefix);
 237
 238 char *xescape(const char *s, const char *bad);
 239
 240 char *bus_path_escape(const char *s);
 241 char *bus_path_unescape(const char *s);
 242
 243 char *ascii_strlower(char *path);
 244
 245 bool dirent_is_file(const struct dirent *de) _pure_;
 246 bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) _pure_;
 247
 248 bool ignore_file(const char *filename) _pure_;
 249
 250 bool chars_intersect(const char *a, const char *b) _pure_;
 251
 252 int make_stdio(int fd);
 253 int make_null_stdio(void);
 254 int make_console_stdio(void);
 255
 256 unsigned long long random_ull(void);
 257 unsigned random_u(void);
 258
 259 /* For basic lookup tables with strictly enumerated entries */
 260 #define __DEFINE_STRING_TABLE_LOOKUP(name,type,scope)                   \
 261         scope const char *name##_to_string(type i) {                    \
 262                 if (i < 0 || i >= (type) ELEMENTSOF(name##_table))      \
 263                         return NULL;                                    \
 264                 return name##_table[i];                                 \
 265         }                                                               \
 266         scope type name##_from_string(const char *s) {                  \
 267                 type i;                                                 \
 268                 assert(s);                                              \
 269                 for (i = 0; i < (type)ELEMENTSOF(name##_table); i++)    \
 270                         if (name##_table[i] &&                          \
 271                             streq(name##_table[i], s))                  \
 272                                 return i;                               \
 273                 return (type) -1;                                       \
 274         }                                                               \
 275         struct __useless_struct_to_allow_trailing_semicolon__
 276
 277 #define DEFINE_STRING_TABLE_LOOKUP(name,type) __DEFINE_STRING_TABLE_LOOKUP(name,type,)
 278 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP(name,type) __DEFINE_STRING_TABLE_LOOKUP(name,type,static)
 279
 280 /* For string conversions where numbers are also acceptable */
 281 #define DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(name,type,max)         \
 282         int name##_to_string_alloc(type i, char **str) {                \
 283                 char *s;                                                \
 284                 int r;                                                  \
 285                 if (i < 0 || i > max)                                   \
 286                         return -ERANGE;                                 \
 287                 if (i < (type) ELEMENTSOF(name##_table)) {              \
 288                         s = strdup(name##_table[i]);                    \
 289                         if (!s)                                         \
 290                                 return log_oom();                       \
 291                 } else {                                                \
 292                         r = asprintf(&s, "%u", i);                      \
 293                         if (r < 0)                                      \
 294                                 return log_oom();                       \
 295                 }                                                       \
 296                 *str = s;                                               \
 297                 return 0;                                               \
 298         }                                                               \
 299         type name##_from_string(const char *s) {                        \
 300                 type i;                                                 \
 301                 unsigned u = 0;                                         \
 302                 assert(s);                                              \
 303                 for (i = 0; i < (type)ELEMENTSOF(name##_table); i++)    \
 304                         if (name##_table[i] &&                          \
 305                             streq(name##_table[i], s))                  \
 306                                 return i;                               \
 307                 if (safe_atou(s, &u) >= 0 && u <= max)                  \
 308                         return (type) u;                                \
 309                 return (type) -1;                                       \
 310         }                                                               \
 311         struct __useless_struct_to_allow_trailing_semicolon__
 312
 313 int fd_nonblock(int fd, bool nonblock);
 314 int fd_cloexec(int fd, bool cloexec);
 315
 316 int close_all_fds(const int except[], unsigned n_except);
 317
 318 bool fstype_is_network(const char *fstype);
 319
 320 int chvt(int vt);
 321
 322 int read_one_char(FILE *f, char *ret, usec_t timeout, bool *need_nl);
 323 int ask(char *ret, const char *replies, const char *text, ...) _printf_attr_(3, 4);
 324
 325 int reset_terminal_fd(int fd, bool switch_to_text);
 326 int reset_terminal(const char *name);
 327
 328 int open_terminal(const char *name, int mode);
 329 int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm, usec_t timeout);
 330 int release_terminal(void);
 331
 332 int flush_fd(int fd);
 333
 334 int ignore_signals(int sig, ...);
 335 int default_signals(int sig, ...);
 336 int sigaction_many(const struct sigaction *sa, ...);
 337
 338 int close_pipe(int p[]);
 339 int fopen_temporary(const char *path, FILE **_f, char **_temp_path);
 340
 341 ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll);
 342 ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll);
 343
 344 bool is_device_path(const char *path);
 345
 346 int dir_is_empty(const char *path);
 347 char* dirname_malloc(const char *path);
 348
 349 void rename_process(const char name[8]);
 350
 351 void sigset_add_many(sigset_t *ss, ...);
 352
 353 bool hostname_is_set(void);
 354
 355 char* gethostname_malloc(void);
 356 char* getlogname_malloc(void);
 357 char* getusername_malloc(void);
 358
 359 int getttyname_malloc(int fd, char **r);
 360 int getttyname_harder(int fd, char **r);
 361
 362 int get_ctty_devnr(pid_t pid, dev_t *d);
 363 int get_ctty(pid_t, dev_t *_devnr, char **r);
 364
 365 int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid);
 366 int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid);
 367
 368 int rm_rf_children(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev);
 369 int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev);
 370 int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky);
 371 int rm_rf_dangerous(const char *path, bool only_dirs, bool delete_root, bool honour_sticky);
 372
 373 int pipe_eof(int fd);
 374
 375 cpu_set_t* cpu_set_malloc(unsigned *ncpus);
 376
 377 int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) _printf_attr_(4,0);
 378 int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) _printf_attr_(4,5);
 379 int status_welcome(void);
 380
 381 int fd_columns(int fd);
 382 unsigned columns(void);
 383 int fd_lines(int fd);
 384 unsigned lines(void);
 385 void columns_lines_cache_reset(int _unused_ signum);
 386
 387 bool on_tty(void);
 388
 389 static inline const char *ansi_highlight(void) {
 390         return on_tty() ? ANSI_HIGHLIGHT_ON : "";
 391 }
 392
 393 static inline const char *ansi_highlight_red(void) {
 394         return on_tty() ? ANSI_HIGHLIGHT_RED_ON : "";
 395 }
 396
 397 static inline const char *ansi_highlight_green(void) {
 398         return on_tty() ? ANSI_HIGHLIGHT_GREEN_ON : "";
 399 }
 400
 401 static inline const char *ansi_highlight_off(void) {
 402         return on_tty() ? ANSI_HIGHLIGHT_OFF : "";
 403 }
 404
 405 int running_in_chroot(void);
 406
 407 char *ellipsize(const char *s, size_t length, unsigned percent);
 408                                    /* bytes                 columns */
 409 char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent);
 410
 411 int touch(const char *path);
 412
 413 char *unquote(const char *s, const char *quotes);
 414 char *normalize_env_assignment(const char *s);
 415
 416 int wait_for_terminate(pid_t pid, siginfo_t *status);
 417 int wait_for_terminate_and_warn(const char *name, pid_t pid);
 418
 419 _noreturn_ void freeze(void);
 420
 421 bool null_or_empty(struct stat *st) _pure_;
 422 int null_or_empty_path(const char *fn);
 423
 424 DIR *xopendirat(int dirfd, const char *name, int flags);
 425
 426 char *fstab_node_to_udev_node(const char *p);
 427
 428 char *resolve_dev_console(char **active);
 429 bool tty_is_vc(const char *tty);
 430 bool tty_is_vc_resolve(const char *tty);
 431 bool tty_is_console(const char *tty) _pure_;
 432 int vtnr_from_tty(const char *tty);
 433 const char *default_term_for_tty(const char *tty);
 434
 435 void execute_directory(const char *directory, DIR *_d, char *argv[]);
 436
 437 int kill_and_sigcont(pid_t pid, int sig);
 438
 439 bool nulstr_contains(const char*nulstr, const char *needle);
 440
 441 bool plymouth_running(void);
 442
 443 bool hostname_is_valid(const char *s) _pure_;
 444 char* hostname_cleanup(char *s, bool lowercase);
 445
 446 char* strshorten(char *s, size_t l);
 447
 448 int terminal_vhangup_fd(int fd);
 449 int terminal_vhangup(const char *name);
 450
 451 int vt_disallocate(const char *name);
 452
 453 int copy_file(const char *from, const char *to, int flags);
 454
 455 int symlink_atomic(const char *from, const char *to);
 456
 457 int fchmod_umask(int fd, mode_t mode);
 458
 459 bool display_is_local(const char *display) _pure_;
 460 int socket_from_display(const char *display, char **path);
 461
 462 int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home, const char **shell);
 463 int get_group_creds(const char **groupname, gid_t *gid);
 464
 465 int in_gid(gid_t gid);
 466 int in_group(const char *name);
 467
 468 char* uid_to_name(uid_t uid);
 469 char* gid_to_name(gid_t gid);
 470
 471 int glob_exists(const char *path);
 472 int glob_extend(char ***strv, const char *path);
 473
 474 int dirent_ensure_type(DIR *d, struct dirent *de);
 475
 476 int in_search_path(const char *path, char **search);
 477 int get_files_in_directory(const char *path, char ***list);
 478
 479 char *strjoin(const char *x, ...) _sentinel_;
 480
 481 bool is_main_thread(void);
 482
 483 bool in_charset(const char *s, const char* charset) _pure_;
 484
 485 int block_get_whole_disk(dev_t d, dev_t *ret);
 486
 487 int file_is_priv_sticky(const char *p);
 488
 489 int strdup_or_null(const char *a, char **b);
 490
 491 #define NULSTR_FOREACH(i, l)                                    \
 492         for ((i) = (l); (i) && *(i); (i) = strchr((i), 0)+1)
 493
 494 #define NULSTR_FOREACH_PAIR(i, j, l)                             \
 495         for ((i) = (l), (j) = strchr((i), 0)+1; (i) && *(i); (i) = strchr((j), 0)+1, (j) = *(i) ? strchr((i), 0)+1 : (i))
 496
 497 int ioprio_class_to_string_alloc(int i, char **s);
 498 int ioprio_class_from_string(const char *s);
 499
 500 const char *sigchld_code_to_string(int i) _const_;
 501 int sigchld_code_from_string(const char *s) _pure_;
 502
 503 int log_facility_unshifted_to_string_alloc(int i, char **s);
 504 int log_facility_unshifted_from_string(const char *s);
 505
 506 int log_level_to_string_alloc(int i, char **s);
 507 int log_level_from_string(const char *s);
 508
 509 int sched_policy_to_string_alloc(int i, char **s);
 510 int sched_policy_from_string(const char *s);
 511
 512 const char *rlimit_to_string(int i) _const_;
 513 int rlimit_from_string(const char *s) _pure_;
 514
 515 int ip_tos_to_string_alloc(int i, char **s);
 516 int ip_tos_from_string(const char *s);
 517
 518 const char *signal_to_string(int i) _const_;
 519 int signal_from_string(const char *s) _pure_;
 520
 521 int signal_from_string_try_harder(const char *s);
 522
 523 extern int saved_argc;
 524 extern char **saved_argv;
 525
 526 bool kexec_loaded(void);
 527
 528 int prot_from_flags(int flags) _const_;
 529
 530 char *format_bytes(char *buf, size_t l, off_t t);
 531
 532 int fd_wait_for_event(int fd, int event, usec_t timeout);
 533
 534 void* memdup(const void *p, size_t l) _alloc_(2);
 535
 536 int is_kernel_thread(pid_t pid);
 537
 538 int fd_inc_sndbuf(int fd, size_t n);
 539 int fd_inc_rcvbuf(int fd, size_t n);
 540
 541 int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...);
 542
 543 int setrlimit_closest(int resource, const struct rlimit *rlim);
 544
 545 int getenv_for_pid(pid_t pid, const char *field, char **_value);
 546
 547 bool is_valid_documentation_url(const char *url) _pure_;
 548
 549 bool in_initrd(void);
 550
 551 void warn_melody(void);
 552
 553 int get_home_dir(char **ret);
 554
 555 static inline void freep(void *p) {
 556         free(*(void**) p);
 557 }
 558
 559 #define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func)                 \
 560         static inline void func##p(type *p) {                   \
 561                 if (*p)                                         \
 562                         func(*p);                               \
 563         }                                                       \
 564         struct __useless_struct_to_allow_trailing_semicolon__
 565
 566 static inline void closep(int *fd) {
 567         if (*fd >= 0)
 568                 close_nointr_nofail(*fd);
 569 }
 570
 571 static inline void umaskp(mode_t *u) {
 572         umask(*u);
 573 }
 574
 575 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, fclose);
 576 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, pclose);
 577 DEFINE_TRIVIAL_CLEANUP_FUNC(DIR*, closedir);
 578 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, endmntent);
 579
 580 #define _cleanup_free_ _cleanup_(freep)
 581 #define _cleanup_close_ _cleanup_(closep)
 582 #define _cleanup_umask_ _cleanup_(umaskp)
 583 #define _cleanup_globfree_ _cleanup_(globfree)
 584 #define _cleanup_fclose_ _cleanup_(fclosep)
 585 #define _cleanup_pclose_ _cleanup_(pclosep)
 586 #define _cleanup_closedir_ _cleanup_(closedirp)
 587 #define _cleanup_endmntent_ _cleanup_(endmntentp)
 588
 589 _malloc_  _alloc_(1, 2) static inline void *malloc_multiply(size_t a, size_t b) {
 590         if (_unlikely_(b == 0 || a > ((size_t) -1) / b))
 591                 return NULL;
 592
 593         return malloc(a * b);
 594 }
 595
 596 _alloc_(2, 3) static inline void *memdup_multiply(const void *p, size_t a, size_t b) {
 597         if (_unlikely_(b == 0 || a > ((size_t) -1) / b))
 598                 return NULL;
 599
 600         return memdup(p, a * b);
 601 }
 602
 603 bool filename_is_safe(const char *p) _pure_;
 604 bool path_is_safe(const char *p) _pure_;
 605 bool string_is_safe(const char *p) _pure_;
 606 bool string_has_cc(const char *p) _pure_;
 607
 608 void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size,
 609                  int (*compar) (const void *, const void *, void *),
 610                  void *arg);
 611
 612 bool is_locale_utf8(void);
 613
 614 typedef enum DrawSpecialChar {
 615         DRAW_TREE_VERT,
 616         DRAW_TREE_BRANCH,
 617         DRAW_TREE_RIGHT,
 618         DRAW_TREE_SPACE,
 619         DRAW_TRIANGULAR_BULLET,
 620         _DRAW_SPECIAL_CHAR_MAX
 621 } DrawSpecialChar;
 622 const char *draw_special_char(DrawSpecialChar ch);
 623
 624 char *strreplace(const char *text, const char *old_string, const char *new_string);
 625
 626 char *strip_tab_ansi(char **p, size_t *l);
 627
 628 int on_ac_power(void);
 629
 630 int search_and_fopen(const char *path, const char *mode, const char **search, FILE **_f);
 631 int search_and_fopen_nulstr(const char *path, const char *mode, const char *search, FILE **_f);
 632 int create_tmp_dir(char template[], char** dir_name);
 633
 634 #define FOREACH_LINE(line, f, on_error)                         \
 635         for (;;)                                                \
 636                 if (!fgets(line, sizeof(line), f)) {            \
 637                         if (ferror(f)) {                        \
 638                                 on_error;                       \
 639                         }                                       \
 640                         break;                                  \
 641                 } else
 642
 643 #define FOREACH_DIRENT(de, d, on_error)                                 \
 644         for (errno = 0, de = readdir(d);; errno = 0, de = readdir(d))   \
 645                 if (!de) {                                              \
 646                         if (errno > 0) {                                \
 647                                 on_error;                               \
 648                         }                                               \
 649                         break;                                          \
 650                 } else if (ignore_file((de)->d_name))                   \
 651                         continue;                                       \
 652                 else
 653
 654 static inline void *mempset(void *s, int c, size_t n) {
 655         memset(s, c, n);
 656         return (uint8_t*)s + n;
 657 }
 658
 659 char *hexmem(const void *p, size_t l);
 660 void *unhexmem(const char *p, size_t l);
 661
 662 char *strextend(char **x, ...) _sentinel_;
 663 char *strrep(const char *s, unsigned n);
 664
 665 void* greedy_realloc(void **p, size_t *allocated, size_t need);
 666 #define GREEDY_REALLOC(array, allocated, need) \
 667         greedy_realloc((void**) &(array), &(allocated), sizeof((array)[0]) * (need))
 668
 669 static inline void _reset_errno_(int *saved_errno) {
 670         errno = *saved_errno;
 671 }
 672
 673 #define PROTECT_ERRNO _cleanup_(_reset_errno_) __attribute__((unused)) int _saved_errno_ = errno
 674
 675 struct _umask_struct_ {
 676         mode_t mask;
 677         bool quit;
 678 };
 679
 680 static inline void _reset_umask_(struct _umask_struct_ *s) {
 681         umask(s->mask);
 682 };
 683
 684 #define RUN_WITH_UMASK(mask)                                            \
 685         for (_cleanup_(_reset_umask_) struct _umask_struct_ _saved_umask_ = { umask(mask), false }; \
 686              !_saved_umask_.quit ;                                      \
 687              _saved_umask_.quit = true)
 688
 689 static inline unsigned u64log2(uint64_t n) {
 690         return (n > 1) ? __builtin_clzll(n) ^ 63U : 0;
 691 }
 692
 693 static inline bool logind_running(void) {
 694         return access("/run/systemd/seats/", F_OK) >= 0;
 695 }
 696
 697 #define DECIMAL_STR_WIDTH(x)                            \
 698         ({                                              \
 699                 typeof(x) _x_ = (x);                    \
 700                 unsigned ans = 1;                       \
 701                 while (_x_ /= 10)                       \
 702                         ans++;                          \
 703                 ans;                                    \
 704         })
 705
 706 int unlink_noerrno(const char *path);
 707
 708 #define alloca0(n)                                      \
 709         ({                                              \
 710                 char *_new_;                            \
 711                 size_t _len_ = n;                       \
 712                 _new_ = alloca(_len_);                  \
 713                 (void *) memset(_new_, 0, _len_);       \
 714         })
 715
 716 #define strappenda(a, b)                                \
 717         ({                                              \
 718                 const char *_a_ = (a), *_b_ = (b);      \
 719                 char *_c_;                              \
 720                 size_t _x_, _y_;                        \
 721                 _x_ = strlen(_a_);                      \
 722                 _y_ = strlen(_b_);                      \
 723                 _c_ = alloca(_x_ + _y_ + 1);            \
 724                 strcpy(stpcpy(_c_, _a_), _b_);          \
 725                 _c_;                                    \
 726         })
 727
 728 #define procfs_file_alloca(pid, field)                                  \
 729         ({                                                              \
 730                 pid_t _pid_ = (pid);                                    \
 731                 char *_r_;                                              \
 732                 _r_ = alloca(sizeof("/proc/") -1 + DECIMAL_STR_MAX(pid_t) + 1 + sizeof(field)); \
 733                 sprintf(_r_, "/proc/%lu/" field, (unsigned long) _pid_); \
 734                 _r_;                                                    \
 735         })
 736
 737 struct _locale_struct_ {
 738         locale_t saved_locale;
 739         locale_t new_locale;
 740         bool quit;
 741 };
 742
 743 static inline void _reset_locale_(struct _locale_struct_ *s) {
 744         PROTECT_ERRNO;
 745         if (s->saved_locale != (locale_t) 0)
 746                 uselocale(s->saved_locale);
 747         if (s->new_locale != (locale_t) 0)
 748                 freelocale(s->new_locale);
 749 }
 750
 751 #define RUN_WITH_LOCALE(mask, loc) \
 752         for (_cleanup_(_reset_locale_) struct _locale_struct_ _saved_locale_ = { (locale_t) 0, (locale_t) 0, false }; \
 753              ({                                                         \
 754                      if (!_saved_locale_.quit) {                        \
 755                              PROTECT_ERRNO;                             \
 756                              _saved_locale_.new_locale = newlocale((mask), (loc), (locale_t) 0); \
 757                              if (_saved_locale_.new_locale != (locale_t) 0)     \
 758                                      _saved_locale_.saved_locale = uselocale(_saved_locale_.new_locale); \
 759                      }                                                  \
 760                      !_saved_locale_.quit; }) ;                         \
 761              _saved_locale_.quit = true)
 762
 763 bool id128_is_valid(const char *s) _pure_;
 764 void parse_user_at_host(char *arg, char **user, char **host);
 765
 766 int split_pair(const char *s, const char *sep, char **l, char **r);
 767
 768 /**
 769  * Normal qsort requires base to be nonnull. Here were require
 770  * that only if nmemb > 0.
 771  */
 772 static inline void qsort_safe(void *base, size_t nmemb, size_t size,
 773                               int (*compar)(const void *, const void *)) {
 774         if (nmemb) {
 775                 assert(base);
 776                 qsort(base, nmemb, size, compar);
 777         }
 778 }