1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
6 This file is part of systemd.
8 Copyright 2010 Lennart Poettering
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.
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.
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/>.
35 #include <sys/types.h>
38 #include <sys/resource.h>
44 #include "time-util.h"
46 union dirent_storage {
48 uint8_t storage[offsetof(struct dirent, d_name) +
49 ((NAME_MAX + 1 + sizeof(long)) & ~(sizeof(long) - 1))];
52 /* What is interpreted as whitespace? */
53 #define WHITESPACE " \t\n\r"
54 #define NEWLINE "\n\r"
58 #define FORMAT_BYTES_MAX 8
60 #define ANSI_HIGHLIGHT_ON "\x1B[1;39m"
61 #define ANSI_RED_ON "\x1B[31m"
62 #define ANSI_HIGHLIGHT_RED_ON "\x1B[1;31m"
63 #define ANSI_GREEN_ON "\x1B[32m"
64 #define ANSI_HIGHLIGHT_GREEN_ON "\x1B[1;32m"
65 #define ANSI_HIGHLIGHT_YELLOW_ON "\x1B[1;33m"
66 #define ANSI_HIGHLIGHT_OFF "\x1B[0m"
67 #define ANSI_ERASE_TO_END_OF_LINE "\x1B[K"
69 size_t page_size(void);
70 #define PAGE_ALIGN(l) ALIGN_TO((l), page_size())
72 #define streq(a,b) (strcmp((a),(b)) == 0)
73 #define strneq(a, b, n) (strncmp((a), (b), (n)) == 0)
74 #define strcaseeq(a,b) (strcasecmp((a),(b)) == 0)
75 #define strncaseeq(a, b, n) (strncasecmp((a), (b), (n)) == 0)
77 bool streq_ptr(const char *a, const char *b) _pure_;
79 #define new(t, n) ((t*) malloc_multiply(sizeof(t), (n)))
81 #define new0(t, n) ((t*) calloc((n), sizeof(t)))
83 #define newa(t, n) ((t*) alloca(sizeof(t)*(n)))
85 #define newdup(t, p, n) ((t*) memdup_multiply(p, sizeof(t), (n)))
87 #define malloc0(n) (calloc((n), 1))
89 static inline const char* yes_no(bool b) {
90 return b ? "yes" : "no";
93 static inline const char* strempty(const char *s) {
97 static inline const char* strnull(const char *s) {
98 return s ? s : "(null)";
101 static inline const char *strna(const char *s) {
102 return s ? s : "n/a";
105 static inline bool isempty(const char *p) {
109 static inline const char *startswith(const char *s, const char *prefix) {
110 if (strncmp(s, prefix, strlen(prefix)) == 0)
111 return s + strlen(prefix);
115 static inline const char *startswith_no_case(const char *s, const char *prefix) {
116 if (strncasecmp(s, prefix, strlen(prefix)) == 0)
117 return s + strlen(prefix);
121 char *endswith(const char *s, const char *postfix) _pure_;
123 bool first_word(const char *s, const char *word) _pure_;
125 int close_nointr(int fd);
126 void close_nointr_nofail(int fd);
127 void close_many(const int fds[], unsigned n_fd);
129 int parse_boolean(const char *v) _pure_;
130 int parse_bytes(const char *t, off_t *bytes);
131 int parse_pid(const char *s, pid_t* ret_pid);
132 int parse_uid(const char *s, uid_t* ret_uid);
133 #define parse_gid(s, ret_uid) parse_uid(s, ret_uid)
135 int safe_atou(const char *s, unsigned *ret_u);
136 int safe_atoi(const char *s, int *ret_i);
138 int safe_atollu(const char *s, unsigned long long *ret_u);
139 int safe_atolli(const char *s, long long int *ret_i);
141 int safe_atod(const char *s, double *ret_d);
144 static inline int safe_atolu(const char *s, unsigned long *ret_u) {
145 assert_cc(sizeof(unsigned long) == sizeof(unsigned));
146 return safe_atou(s, (unsigned*) ret_u);
148 static inline int safe_atoli(const char *s, long int *ret_u) {
149 assert_cc(sizeof(long int) == sizeof(int));
150 return safe_atoi(s, (int*) ret_u);
153 static inline int safe_atolu(const char *s, unsigned long *ret_u) {
154 assert_cc(sizeof(unsigned long) == sizeof(unsigned long long));
155 return safe_atollu(s, (unsigned long long*) ret_u);
157 static inline int safe_atoli(const char *s, long int *ret_u) {
158 assert_cc(sizeof(long int) == sizeof(long long int));
159 return safe_atolli(s, (long long int*) ret_u);
163 static inline int safe_atou32(const char *s, uint32_t *ret_u) {
164 assert_cc(sizeof(uint32_t) == sizeof(unsigned));
165 return safe_atou(s, (unsigned*) ret_u);
168 static inline int safe_atoi32(const char *s, int32_t *ret_i) {
169 assert_cc(sizeof(int32_t) == sizeof(int));
170 return safe_atoi(s, (int*) ret_i);
173 static inline int safe_atou64(const char *s, uint64_t *ret_u) {
174 assert_cc(sizeof(uint64_t) == sizeof(unsigned long long));
175 return safe_atollu(s, (unsigned long long*) ret_u);
178 static inline int safe_atoi64(const char *s, int64_t *ret_i) {
179 assert_cc(sizeof(int64_t) == sizeof(long long int));
180 return safe_atolli(s, (long long int*) ret_i);
183 char *split(const char *c, size_t *l, const char *separator, char **state);
184 char *split_quoted(const char *c, size_t *l, char **state);
186 #define FOREACH_WORD(word, length, s, state) \
187 for ((state) = NULL, (word) = split((s), &(length), WHITESPACE, &(state)); (word); (word) = split((s), &(length), WHITESPACE, &(state)))
189 #define FOREACH_WORD_SEPARATOR(word, length, s, separator, state) \
190 for ((state) = NULL, (word) = split((s), &(length), (separator), &(state)); (word); (word) = split((s), &(length), (separator), &(state)))
192 #define FOREACH_WORD_QUOTED(word, length, s, state) \
193 for ((state) = NULL, (word) = split_quoted((s), &(length), &(state)); (word); (word) = split_quoted((s), &(length), &(state)))
195 pid_t get_parent_of_pid(pid_t pid, pid_t *ppid);
196 int get_starttime_of_pid(pid_t pid, unsigned long long *st);
198 char *strappend(const char *s, const char *suffix);
199 char *strnappend(const char *s, const char *suffix, size_t length);
201 char *replace_env(const char *format, char **env);
202 char **replace_env_argv(char **argv, char **env);
204 int readlink_malloc(const char *p, char **r);
205 int readlink_and_make_absolute(const char *p, char **r);
206 int readlink_and_canonicalize(const char *p, char **r);
208 int reset_all_signal_handlers(void);
210 char *strstrip(char *s);
211 char *delete_chars(char *s, const char *bad);
212 char *truncate_nl(char *s);
214 char *file_in_same_dir(const char *path, const char *filename);
216 int rmdir_parents(const char *path, const char *stop);
218 int get_process_comm(pid_t pid, char **name);
219 int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line);
220 int get_process_exe(pid_t pid, char **name);
221 int get_process_uid(pid_t pid, uid_t *uid);
222 int get_process_gid(pid_t pid, gid_t *gid);
223 int get_process_capeff(pid_t pid, char **capeff);
225 char hexchar(int x) _const_;
226 int unhexchar(char c) _const_;
227 char octchar(int x) _const_;
228 int unoctchar(char c) _const_;
229 char decchar(int x) _const_;
230 int undecchar(char c) _const_;
232 char *cescape(const char *s);
233 char *cunescape(const char *s);
234 char *cunescape_length(const char *s, size_t length);
235 char *cunescape_length_with_prefix(const char *s, size_t length, const char *prefix);
237 char *xescape(const char *s, const char *bad);
239 char *bus_path_escape(const char *s);
240 char *bus_path_unescape(const char *s);
242 char *ascii_strlower(char *path);
244 bool dirent_is_file(const struct dirent *de) _pure_;
245 bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) _pure_;
247 bool ignore_file(const char *filename) _pure_;
249 bool chars_intersect(const char *a, const char *b) _pure_;
251 int make_stdio(int fd);
252 int make_null_stdio(void);
253 int make_console_stdio(void);
255 unsigned long long random_ull(void);
256 unsigned random_u(void);
258 /* For basic lookup tables with strictly enumerated entries */
259 #define __DEFINE_STRING_TABLE_LOOKUP(name,type,scope) \
260 scope const char *name##_to_string(type i) { \
261 if (i < 0 || i >= (type) ELEMENTSOF(name##_table)) \
263 return name##_table[i]; \
265 scope type name##_from_string(const char *s) { \
268 for (i = 0; i < (type)ELEMENTSOF(name##_table); i++) \
269 if (name##_table[i] && \
270 streq(name##_table[i], s)) \
274 struct __useless_struct_to_allow_trailing_semicolon__
276 #define DEFINE_STRING_TABLE_LOOKUP(name,type) __DEFINE_STRING_TABLE_LOOKUP(name,type,)
277 #define DEFINE_PRIVATE_STRING_TABLE_LOOKUP(name,type) __DEFINE_STRING_TABLE_LOOKUP(name,type,static)
279 /* For string conversions where numbers are also acceptable */
280 #define DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(name,type,max) \
281 int name##_to_string_alloc(type i, char **str) { \
284 if (i < 0 || i > max) \
286 if (i < (type) ELEMENTSOF(name##_table)) { \
287 s = strdup(name##_table[i]); \
291 r = asprintf(&s, "%u", i); \
298 type name##_from_string(const char *s) { \
302 for (i = 0; i < (type)ELEMENTSOF(name##_table); i++) \
303 if (name##_table[i] && \
304 streq(name##_table[i], s)) \
306 if (safe_atou(s, &u) >= 0 && u <= max) \
310 struct __useless_struct_to_allow_trailing_semicolon__
312 int fd_nonblock(int fd, bool nonblock);
313 int fd_cloexec(int fd, bool cloexec);
315 int close_all_fds(const int except[], unsigned n_except);
317 bool fstype_is_network(const char *fstype);
321 int read_one_char(FILE *f, char *ret, usec_t timeout, bool *need_nl);
322 int ask(char *ret, const char *replies, const char *text, ...) _printf_attr_(3, 4);
324 int reset_terminal_fd(int fd, bool switch_to_text);
325 int reset_terminal(const char *name);
327 int open_terminal(const char *name, int mode);
328 int acquire_terminal(const char *name, bool fail, bool force, bool ignore_tiocstty_eperm, usec_t timeout);
329 int release_terminal(void);
331 int flush_fd(int fd);
333 int ignore_signals(int sig, ...);
334 int default_signals(int sig, ...);
335 int sigaction_many(const struct sigaction *sa, ...);
337 int close_pipe(int p[]);
338 int fopen_temporary(const char *path, FILE **_f, char **_temp_path);
340 ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll);
341 ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll);
343 bool is_device_path(const char *path);
345 int dir_is_empty(const char *path);
346 char* dirname_malloc(const char *path);
348 void rename_process(const char name[8]);
350 void sigset_add_many(sigset_t *ss, ...);
352 bool hostname_is_set(void);
354 char* gethostname_malloc(void);
355 char* getlogname_malloc(void);
356 char* getusername_malloc(void);
358 int getttyname_malloc(int fd, char **r);
359 int getttyname_harder(int fd, char **r);
361 int get_ctty_devnr(pid_t pid, dev_t *d);
362 int get_ctty(pid_t, dev_t *_devnr, char **r);
364 int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid);
365 int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid);
367 int rm_rf_children(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev);
368 int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev);
369 int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky);
370 int rm_rf_dangerous(const char *path, bool only_dirs, bool delete_root, bool honour_sticky);
372 int pipe_eof(int fd);
374 cpu_set_t* cpu_set_malloc(unsigned *ncpus);
376 int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) _printf_attr_(4,0);
377 int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) _printf_attr_(4,5);
378 int status_welcome(void);
380 int fd_columns(int fd);
381 unsigned columns(void);
382 int fd_lines(int fd);
383 unsigned lines(void);
384 void columns_lines_cache_reset(int _unused_ signum);
388 static inline const char *ansi_highlight(void) {
389 return on_tty() ? ANSI_HIGHLIGHT_ON : "";
392 static inline const char *ansi_highlight_red(void) {
393 return on_tty() ? ANSI_HIGHLIGHT_RED_ON : "";
396 static inline const char *ansi_highlight_green(void) {
397 return on_tty() ? ANSI_HIGHLIGHT_GREEN_ON : "";
400 static inline const char *ansi_highlight_off(void) {
401 return on_tty() ? ANSI_HIGHLIGHT_OFF : "";
404 int running_in_chroot(void);
406 char *ellipsize(const char *s, size_t length, unsigned percent);
407 char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent);
409 int touch(const char *path);
411 char *unquote(const char *s, const char *quotes);
412 char *normalize_env_assignment(const char *s);
414 int wait_for_terminate(pid_t pid, siginfo_t *status);
415 int wait_for_terminate_and_warn(const char *name, pid_t pid);
417 _noreturn_ void freeze(void);
419 bool null_or_empty(struct stat *st) _pure_;
420 int null_or_empty_path(const char *fn);
422 DIR *xopendirat(int dirfd, const char *name, int flags);
424 char *fstab_node_to_udev_node(const char *p);
426 char *resolve_dev_console(char **active);
427 bool tty_is_vc(const char *tty);
428 bool tty_is_vc_resolve(const char *tty);
429 bool tty_is_console(const char *tty) _pure_;
430 int vtnr_from_tty(const char *tty);
431 const char *default_term_for_tty(const char *tty);
433 void execute_directory(const char *directory, DIR *_d, char *argv[]);
435 int kill_and_sigcont(pid_t pid, int sig);
437 bool nulstr_contains(const char*nulstr, const char *needle);
439 bool plymouth_running(void);
441 bool hostname_is_valid(const char *s) _pure_;
442 char* hostname_cleanup(char *s, bool lowercase);
444 char* strshorten(char *s, size_t l);
446 int terminal_vhangup_fd(int fd);
447 int terminal_vhangup(const char *name);
449 int vt_disallocate(const char *name);
451 int copy_file(const char *from, const char *to, int flags);
453 int symlink_atomic(const char *from, const char *to);
455 int fchmod_umask(int fd, mode_t mode);
457 bool display_is_local(const char *display) _pure_;
458 int socket_from_display(const char *display, char **path);
460 int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const char **home, const char **shell);
461 int get_group_creds(const char **groupname, gid_t *gid);
463 int in_gid(gid_t gid);
464 int in_group(const char *name);
466 char* uid_to_name(uid_t uid);
467 char* gid_to_name(gid_t gid);
469 int glob_exists(const char *path);
470 int glob_extend(char ***strv, const char *path);
472 int dirent_ensure_type(DIR *d, struct dirent *de);
474 int in_search_path(const char *path, char **search);
475 int get_files_in_directory(const char *path, char ***list);
477 char *strjoin(const char *x, ...) _sentinel_;
479 bool is_main_thread(void);
481 bool in_charset(const char *s, const char* charset) _pure_;
483 int block_get_whole_disk(dev_t d, dev_t *ret);
485 int file_is_priv_sticky(const char *p);
487 int strdup_or_null(const char *a, char **b);
489 #define NULSTR_FOREACH(i, l) \
490 for ((i) = (l); (i) && *(i); (i) = strchr((i), 0)+1)
492 #define NULSTR_FOREACH_PAIR(i, j, l) \
493 for ((i) = (l), (j) = strchr((i), 0)+1; (i) && *(i); (i) = strchr((j), 0)+1, (j) = *(i) ? strchr((i), 0)+1 : (i))
495 int ioprio_class_to_string_alloc(int i, char **s);
496 int ioprio_class_from_string(const char *s);
498 const char *sigchld_code_to_string(int i) _const_;
499 int sigchld_code_from_string(const char *s) _pure_;
501 int log_facility_unshifted_to_string_alloc(int i, char **s);
502 int log_facility_unshifted_from_string(const char *s);
504 int log_level_to_string_alloc(int i, char **s);
505 int log_level_from_string(const char *s);
507 int sched_policy_to_string_alloc(int i, char **s);
508 int sched_policy_from_string(const char *s);
510 const char *rlimit_to_string(int i) _const_;
511 int rlimit_from_string(const char *s) _pure_;
513 int ip_tos_to_string_alloc(int i, char **s);
514 int ip_tos_from_string(const char *s);
516 const char *signal_to_string(int i) _const_;
517 int signal_from_string(const char *s) _pure_;
519 int signal_from_string_try_harder(const char *s);
521 extern int saved_argc;
522 extern char **saved_argv;
524 bool kexec_loaded(void);
526 int prot_from_flags(int flags) _const_;
528 char *format_bytes(char *buf, size_t l, off_t t);
530 int fd_wait_for_event(int fd, int event, usec_t timeout);
532 void* memdup(const void *p, size_t l) _alloc_(2);
534 int is_kernel_thread(pid_t pid);
536 int fd_inc_sndbuf(int fd, size_t n);
537 int fd_inc_rcvbuf(int fd, size_t n);
539 int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...);
541 int setrlimit_closest(int resource, const struct rlimit *rlim);
543 int getenv_for_pid(pid_t pid, const char *field, char **_value);
545 bool is_valid_documentation_url(const char *url) _pure_;
547 bool in_initrd(void);
549 void warn_melody(void);
551 int get_home_dir(char **ret);
553 static inline void freep(void *p) {
557 static inline void fclosep(FILE **f) {
562 static inline void pclosep(FILE **f) {
567 static inline void closep(int *fd) {
569 close_nointr_nofail(*fd);
572 static inline void closedirp(DIR **d) {
577 static inline void umaskp(mode_t *u) {
581 #define _cleanup_free_ _cleanup_(freep)
582 #define _cleanup_fclose_ _cleanup_(fclosep)
583 #define _cleanup_pclose_ _cleanup_(pclosep)
584 #define _cleanup_close_ _cleanup_(closep)
585 #define _cleanup_closedir_ _cleanup_(closedirp)
586 #define _cleanup_umask_ _cleanup_(umaskp)
587 #define _cleanup_globfree_ _cleanup_(globfree)
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))
593 return malloc(a * b);
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))
600 return memdup(p, a * b);
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_;
608 void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size,
609 int (*compar) (const void *, const void *, void *),
612 bool is_locale_utf8(void);
614 typedef enum DrawSpecialChar {
619 DRAW_TRIANGULAR_BULLET,
620 _DRAW_SPECIAL_CHAR_MAX
622 const char *draw_special_char(DrawSpecialChar ch);
624 char *strreplace(const char *text, const char *old_string, const char *new_string);
626 char *strip_tab_ansi(char **p, size_t *l);
628 int on_ac_power(void);
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);
634 #define FOREACH_LINE(line, f, on_error) \
636 if (!fgets(line, sizeof(line), f)) { \
643 #define FOREACH_DIRENT(de, d, on_error) \
644 for (errno = 0, de = readdir(d);; errno = 0, de = readdir(d)) \
650 } else if (ignore_file((de)->d_name)) \
654 static inline void *mempset(void *s, int c, size_t n) {
656 return (uint8_t*)s + n;
659 char *hexmem(const void *p, size_t l);
660 void *unhexmem(const char *p, size_t l);
662 char *strextend(char **x, ...) _sentinel_;
663 char *strrep(const char *s, unsigned n);
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))
669 static inline void _reset_errno_(int *saved_errno) {
670 errno = *saved_errno;
673 #define PROTECT_ERRNO _cleanup_(_reset_errno_) __attribute__((unused)) int _saved_errno_ = errno
675 struct _umask_struct_ {
680 static inline void _reset_umask_(struct _umask_struct_ *s) {
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)
689 static inline unsigned u64log2(uint64_t n) {
690 return (n > 1) ? __builtin_clzll(n) ^ 63U : 0;
693 static inline bool logind_running(void) {
694 return access("/run/systemd/seats/", F_OK) >= 0;
697 #define DECIMAL_STR_WIDTH(x) \
699 typeof(x) _x_ = (x); \
706 int unlink_noerrno(const char *path);
712 _new_ = alloca(_len_); \
713 (void *) memset(_new_, 0, _len_); \
716 #define strappenda(a, b) \
718 const char *_a_ = (a), *_b_ = (b); \
723 _c_ = alloca(_x_ + _y_ + 1); \
724 strcpy(stpcpy(_c_, _a_), _b_); \
728 #define procfs_file_alloca(pid, field) \
730 pid_t _pid_ = (pid); \
732 _r_ = alloca(sizeof("/proc/") -1 + DECIMAL_STR_MAX(pid_t) + 1 + sizeof(field)); \
733 sprintf(_r_, "/proc/%lu/" field, (unsigned long) _pid_); \
737 struct _locale_struct_ {
738 locale_t saved_locale;
743 static inline void _reset_locale_(struct _locale_struct_ *s) {
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);
751 #define RUN_WITH_LOCALE(mask, loc) \
752 for (_cleanup_(_reset_locale_) struct _locale_struct_ _saved_locale_ = { (locale_t) 0, (locale_t) 0, false }; \
754 if (!_saved_locale_.quit) { \
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); \
760 !_saved_locale_.quit; }) ; \
761 _saved_locale_.quit = true)
763 bool id128_is_valid(const char *s) _pure_;
764 void parse_user_at_host(char *arg, char **user, char **host);
766 int split_pair(const char *s, const char *sep, char **l, char **r);