2 This file is part of systemd.
4 Copyright 2010 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
29 #include <sys/types.h>
32 #include "alloc-util.h"
40 #include "hexdecoct.h"
44 #include "parse-util.h"
45 #include "path-util.h"
46 #include "process-util.h"
47 #include "random-util.h"
48 #include "stdio-util.h"
49 #include "string-util.h"
51 //#include "time-util.h"
52 #include "umask-util.h"
55 #define READ_FULL_BYTES_MAX (4U*1024U*1024U)
57 int write_string_stream_ts(
60 WriteStringFileFlags flags,
61 struct timespec *ts) {
67 if (!(flags & WRITE_STRING_FILE_AVOID_NEWLINE) && !endswith(line, "\n"))
71 struct timespec twice[2] = {*ts, *ts};
73 if (futimens(fileno(f), twice) < 0)
77 if (flags & WRITE_STRING_FILE_SYNC)
78 return fflush_sync_and_check(f);
80 return fflush_and_check(f);
83 static int write_string_file_atomic(
86 WriteStringFileFlags flags,
87 struct timespec *ts) {
89 _cleanup_fclose_ FILE *f = NULL;
90 _cleanup_free_ char *p = NULL;
96 r = fopen_temporary(fn, &f, &p);
100 (void) fchmod_umask(fileno(f), 0644);
102 r = write_string_stream_ts(f, line, flags, ts);
106 if (rename(p, fn) < 0) {
118 int write_string_file_ts(
121 WriteStringFileFlags flags,
122 struct timespec *ts) {
124 _cleanup_fclose_ FILE *f = NULL;
130 /* We don't know how to verify whether the file contents was already on-disk. */
131 assert(!((flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE) && (flags & WRITE_STRING_FILE_SYNC)));
133 if (flags & WRITE_STRING_FILE_ATOMIC) {
134 assert(flags & WRITE_STRING_FILE_CREATE);
136 r = write_string_file_atomic(fn, line, flags, ts);
144 if (flags & WRITE_STRING_FILE_CREATE) {
153 /* We manually build our own version of fopen(..., "we") that
154 * works without O_CREAT */
155 fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY);
161 f = fdopen(fd, "we");
169 if (flags & WRITE_STRING_FILE_DISABLE_BUFFER)
170 setvbuf(f, NULL, _IONBF, 0);
172 r = write_string_stream_ts(f, line, flags, ts);
179 if (!(flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE))
184 /* OK, the operation failed, but let's see if the right
185 * contents in place already. If so, eat up the error. */
187 q = verify_file(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE));
194 int read_one_line_file(const char *fn, char **line) {
195 _cleanup_fclose_ FILE *f = NULL;
205 r = read_line(f, LONG_LINE_MAX, line);
206 return r < 0 ? r : 0;
209 int verify_file(const char *fn, const char *blob, bool accept_extra_nl) {
210 _cleanup_fclose_ FILE *f = NULL;
211 _cleanup_free_ char *buf = NULL;
219 if (accept_extra_nl && endswith(blob, "\n"))
220 accept_extra_nl = false;
222 buf = malloc(l + accept_extra_nl + 1);
230 /* We try to read one byte more than we need, so that we know whether we hit eof */
232 k = fread(buf, 1, l + accept_extra_nl + 1, f);
234 return errno > 0 ? -errno : -EIO;
236 if (k != l && k != l + accept_extra_nl)
238 if (memcmp(buf, blob, l) != 0)
240 if (k > l && buf[l] != '\n')
246 int read_full_stream(FILE *f, char **contents, size_t *size) {
248 _cleanup_free_ char *buf = NULL;
254 if (fstat(fileno(f), &st) < 0)
259 if (S_ISREG(st.st_mode)) {
262 if (st.st_size > READ_FULL_BYTES_MAX)
265 /* Start with the right file size, but be prepared for files from /proc which generally report a file
266 * size of 0. Note that we increase the size to read here by one, so that the first read attempt
267 * already makes us notice the EOF. */
277 t = realloc(buf, n + 1);
283 k = fread(buf + l, 1, n - l, f);
288 return errno > 0 ? -errno : -EIO;
293 /* We aren't expecting fread() to return a short read outside
294 * of (error && eof), assert buffer is full and enlarge buffer.
299 if (n >= READ_FULL_BYTES_MAX)
302 n = MIN(n * 2, READ_FULL_BYTES_MAX);
307 buf = NULL; /* do not free */
315 int read_full_file(const char *fn, char **contents, size_t *size) {
316 _cleanup_fclose_ FILE *f = NULL;
325 return read_full_stream(f, contents, size);
328 static int parse_env_file_internal(
332 int (*push) (const char *filename, unsigned line,
333 const char *key, char *value, void *userdata, int *n_pushed),
337 _cleanup_free_ char *contents = NULL, *key = NULL;
338 size_t key_alloc = 0, n_key = 0, value_alloc = 0, n_value = 0, last_value_whitespace = (size_t) -1, last_key_whitespace = (size_t) -1;
339 char *p, *value = NULL;
350 SINGLE_QUOTE_VALUE_ESCAPE,
352 DOUBLE_QUOTE_VALUE_ESCAPE,
360 r = read_full_stream(f, &contents, NULL);
362 r = read_full_file(fname, &contents, NULL);
366 for (p = contents; *p; p++) {
372 if (strchr(COMMENTS, c))
374 else if (!strchr(WHITESPACE, c)) {
376 last_key_whitespace = (size_t) -1;
378 if (!GREEDY_REALLOC(key, key_alloc, n_key+2)) {
388 if (strchr(newline, c)) {
392 } else if (c == '=') {
394 last_value_whitespace = (size_t) -1;
396 if (!strchr(WHITESPACE, c))
397 last_key_whitespace = (size_t) -1;
398 else if (last_key_whitespace == (size_t) -1)
399 last_key_whitespace = n_key;
401 if (!GREEDY_REALLOC(key, key_alloc, n_key+2)) {
412 if (strchr(newline, c)) {
420 /* strip trailing whitespace from key */
421 if (last_key_whitespace != (size_t) -1)
422 key[last_key_whitespace] = 0;
424 r = push(fname, line, key, value, userdata, n_pushed);
430 value_alloc = n_value = 0;
432 } else if (c == '\'')
433 state = SINGLE_QUOTE_VALUE;
435 state = DOUBLE_QUOTE_VALUE;
437 state = VALUE_ESCAPE;
438 else if (!strchr(WHITESPACE, c)) {
441 if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
446 value[n_value++] = c;
452 if (strchr(newline, c)) {
461 /* Chomp off trailing whitespace from value */
462 if (last_value_whitespace != (size_t) -1)
463 value[last_value_whitespace] = 0;
465 /* strip trailing whitespace from key */
466 if (last_key_whitespace != (size_t) -1)
467 key[last_key_whitespace] = 0;
469 r = push(fname, line, key, value, userdata, n_pushed);
475 value_alloc = n_value = 0;
477 } else if (c == '\\') {
478 state = VALUE_ESCAPE;
479 last_value_whitespace = (size_t) -1;
481 if (!strchr(WHITESPACE, c))
482 last_value_whitespace = (size_t) -1;
483 else if (last_value_whitespace == (size_t) -1)
484 last_value_whitespace = n_value;
486 if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
491 value[n_value++] = c;
499 if (!strchr(newline, c)) {
500 /* Escaped newlines we eat up entirely */
501 if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
506 value[n_value++] = c;
510 case SINGLE_QUOTE_VALUE:
514 state = SINGLE_QUOTE_VALUE_ESCAPE;
516 if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
521 value[n_value++] = c;
526 case SINGLE_QUOTE_VALUE_ESCAPE:
527 state = SINGLE_QUOTE_VALUE;
529 if (!strchr(newline, c)) {
530 if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
535 value[n_value++] = c;
539 case DOUBLE_QUOTE_VALUE:
543 state = DOUBLE_QUOTE_VALUE_ESCAPE;
545 if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
550 value[n_value++] = c;
555 case DOUBLE_QUOTE_VALUE_ESCAPE:
556 state = DOUBLE_QUOTE_VALUE;
558 if (!strchr(newline, c)) {
559 if (!GREEDY_REALLOC(value, value_alloc, n_value+2)) {
564 value[n_value++] = c;
570 state = COMMENT_ESCAPE;
571 else if (strchr(newline, c)) {
588 SINGLE_QUOTE_VALUE_ESCAPE,
590 DOUBLE_QUOTE_VALUE_ESCAPE)) {
598 if (last_value_whitespace != (size_t) -1)
599 value[last_value_whitespace] = 0;
601 /* strip trailing whitespace from key */
602 if (last_key_whitespace != (size_t) -1)
603 key[last_key_whitespace] = 0;
605 r = push(fname, line, key, value, userdata, n_pushed);
617 static int check_utf8ness_and_warn(
618 const char *filename, unsigned line,
619 const char *key, char *value) {
621 if (!utf8_is_valid(key)) {
622 _cleanup_free_ char *p = NULL;
624 p = utf8_escape_invalid(key);
625 log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.", strna(filename), line, p);
629 if (value && !utf8_is_valid(value)) {
630 _cleanup_free_ char *p = NULL;
632 p = utf8_escape_invalid(value);
633 log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, p);
640 static int parse_env_file_push(
641 const char *filename, unsigned line,
642 const char *key, char *value,
647 va_list aq, *ap = userdata;
650 r = check_utf8ness_and_warn(filename, line, key, value);
656 while ((k = va_arg(aq, const char *))) {
659 v = va_arg(aq, char **);
681 const char *newline, ...) {
689 va_start(ap, newline);
690 r = parse_env_file_internal(NULL, fname, newline, parse_env_file_push, &ap, &n_pushed);
693 return r < 0 ? r : n_pushed;
696 #if 0 /// UNNEEDED by elogind
697 static int load_env_file_push(
698 const char *filename, unsigned line,
699 const char *key, char *value,
702 char ***m = userdata;
706 r = check_utf8ness_and_warn(filename, line, key, value);
710 p = strjoin(key, "=", value);
714 r = strv_env_replace(m, p);
727 int load_env_file(FILE *f, const char *fname, const char *newline, char ***rl) {
734 r = parse_env_file_internal(f, fname, newline, load_env_file_push, &m, NULL);
745 static int load_env_file_push_pairs(
746 const char *filename, unsigned line,
747 const char *key, char *value,
750 char ***m = userdata;
753 r = check_utf8ness_and_warn(filename, line, key, value);
757 r = strv_extend(m, key);
762 r = strv_extend(m, "");
766 r = strv_push(m, value);
777 int load_env_file_pairs(FILE *f, const char *fname, const char *newline, char ***rl) {
784 r = parse_env_file_internal(f, fname, newline, load_env_file_push_pairs, &m, NULL);
793 #if 0 /// UNNEEDED by elogind
795 static int merge_env_file_push(
796 const char *filename, unsigned line,
797 const char *key, char *value,
801 char ***env = userdata;
802 char *expanded_value;
807 log_error("%s:%u: invalid syntax (around \"%s\"), ignoring.", strna(filename), line, key);
811 if (!env_name_is_valid(key)) {
812 log_error("%s:%u: invalid variable name \"%s\", ignoring.", strna(filename), line, key);
817 expanded_value = replace_env(value, *env,
818 REPLACE_ENV_USE_ENVIRONMENT|
819 REPLACE_ENV_ALLOW_BRACELESS|
820 REPLACE_ENV_ALLOW_EXTENDED);
824 free_and_replace(value, expanded_value);
826 return load_env_file_push(filename, line, key, value, env, n_pushed);
834 /* NOTE: this function supports braceful and braceless variable expansions,
835 * plus "extended" substitutions, unlike other exported parsing functions.
838 return parse_env_file_internal(f, fname, NEWLINE, merge_env_file_push, env, NULL);
841 static void write_env_var(FILE *f, const char *v) {
847 fputs_unlocked(v, f);
848 fputc_unlocked('\n', f);
853 fwrite_unlocked(v, 1, p-v, f);
855 if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE SHELL_NEED_QUOTES)) {
856 fputc_unlocked('\"', f);
859 if (strchr(SHELL_NEED_ESCAPE, *p))
860 fputc_unlocked('\\', f);
862 fputc_unlocked(*p, f);
865 fputc_unlocked('\"', f);
867 fputs_unlocked(p, f);
869 fputc_unlocked('\n', f);
872 int write_env_file(const char *fname, char **l) {
873 _cleanup_fclose_ FILE *f = NULL;
874 _cleanup_free_ char *p = NULL;
880 r = fopen_temporary(fname, &f, &p);
884 fchmod_umask(fileno(f), 0644);
887 write_env_var(f, *i);
889 r = fflush_and_check(f);
891 if (rename(p, fname) >= 0)
901 int executable_is_script(const char *path, char **interpreter) {
903 _cleanup_free_ char *line = NULL;
909 r = read_one_line_file(path, &line);
913 if (!startswith(line, "#!"))
916 ans = strstrip(line + 2);
917 len = strcspn(ans, " \t");
922 ans = strndup(ans, len);
932 * Retrieve one field from a file like /proc/self/status. pattern
933 * should not include whitespace or the delimiter (':'). pattern matches only
934 * the beginning of a line. Whitespace before ':' is skipped. Whitespace and
935 * zeros after the ':' will be skipped. field must be freed afterwards.
936 * terminator specifies the terminating characters of the field value (not
937 * included in the value).
939 int get_proc_field(const char *filename, const char *pattern, const char *terminator, char **field) {
940 _cleanup_free_ char *status = NULL;
950 r = read_full_file(filename, &status, NULL);
960 t = strstr(t, pattern);
964 /* Check that pattern occurs in beginning of line. */
965 pattern_ok = (t == status || t[-1] == '\n');
967 t += strlen(pattern);
969 } while (!pattern_ok);
971 t += strspn(t, " \t");
980 t += strspn(t, " \t");
982 /* Also skip zeros, because when this is used for
983 * capabilities, we don't want the zeros. This way the
984 * same capability set always maps to the same string,
985 * irrespective of the total capability set size. For
986 * other numbers it shouldn't matter. */
988 /* Back off one char if there's nothing but whitespace
990 if (!*t || isspace(*t))
994 len = strcspn(t, terminator);
1004 DIR *xopendirat(int fd, const char *name, int flags) {
1008 assert(!(flags & O_CREAT));
1010 nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0);
1023 #if 0 /// UNNEEDED by elogind
1024 static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) {
1031 if (!path_strv_resolve_uniq(search, root))
1034 STRV_FOREACH(i, search) {
1035 _cleanup_free_ char *p = NULL;
1039 p = strjoin(root, *i, "/", path);
1041 p = strjoin(*i, "/", path);
1051 if (errno != ENOENT)
1058 int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) {
1059 _cleanup_strv_free_ char **copy = NULL;
1065 if (path_is_absolute(path)) {
1068 f = fopen(path, mode);
1077 copy = strv_copy((char**) search);
1081 return search_and_fopen_internal(path, mode, root, copy, _f);
1084 int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) {
1085 _cleanup_strv_free_ char **s = NULL;
1087 if (path_is_absolute(path)) {
1090 f = fopen(path, mode);
1099 s = strv_split_nulstr(search);
1103 return search_and_fopen_internal(path, mode, root, s, _f);
1107 int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
1116 r = tempfn_xxxxxx(path, NULL, &t);
1120 fd = mkostemp_safe(t);
1126 f = fdopen(fd, "we");
1140 int fflush_and_check(FILE *f) {
1147 return errno > 0 ? -errno : -EIO;
1152 int fflush_sync_and_check(FILE *f) {
1157 r = fflush_and_check(f);
1161 if (fsync(fileno(f)) < 0)
1167 /* This is much like mkostemp() but is subject to umask(). */
1168 int mkostemp_safe(char *pattern) {
1169 _cleanup_umask_ mode_t u = 0;
1176 fd = mkostemp(pattern, O_CLOEXEC);
1183 int tempfn_xxxxxx(const char *p, const char *extra, char **ret) {
1195 * /foo/bar/.#<extra>waldoXXXXXX
1199 if (!filename_is_valid(fn))
1205 t = new(char, strlen(p) + 2 + strlen(extra) + 6 + 1);
1209 strcpy(stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn), "XXXXXX");
1211 *ret = path_kill_slashes(t);
1215 int tempfn_random(const char *p, const char *extra, char **ret) {
1229 * /foo/bar/.#<extra>waldobaa2a261115984a9
1233 if (!filename_is_valid(fn))
1239 t = new(char, strlen(p) + 2 + strlen(extra) + 16 + 1);
1243 x = stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn);
1246 for (i = 0; i < 16; i++) {
1247 *(x++) = hexchar(u & 0xF);
1253 *ret = path_kill_slashes(t);
1257 #if 0 /// UNNEEDED by elogind
1258 int tempfn_random_child(const char *p, const char *extra, char **ret) {
1269 * /foo/bar/waldo/.#<extra>3c2b6219aa75d7d0
1281 t = new(char, strlen(p) + 3 + strlen(extra) + 16 + 1);
1285 x = stpcpy(stpcpy(stpcpy(t, p), "/.#"), extra);
1288 for (i = 0; i < 16; i++) {
1289 *(x++) = hexchar(u & 0xF);
1295 *ret = path_kill_slashes(t);
1299 int write_timestamp_file_atomic(const char *fn, usec_t n) {
1300 char ln[DECIMAL_STR_MAX(n)+2];
1302 /* Creates a "timestamp" file, that contains nothing but a
1303 * usec_t timestamp, formatted in ASCII. */
1305 if (n <= 0 || n >= USEC_INFINITY)
1308 xsprintf(ln, USEC_FMT "\n", n);
1310 return write_string_file(fn, ln, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
1313 int read_timestamp_file(const char *fn, usec_t *ret) {
1314 _cleanup_free_ char *ln = NULL;
1318 r = read_one_line_file(fn, &ln);
1322 r = safe_atou64(ln, &t);
1326 if (t <= 0 || t >= (uint64_t) USEC_INFINITY)
1333 int fputs_with_space(FILE *f, const char *s, const char *separator, bool *space) {
1338 /* Outputs the specified string with fputs(), but optionally prefixes it with a separator. The *space parameter
1339 * when specified shall initially point to a boolean variable initialized to false. It is set to true after the
1340 * first invocation. This call is supposed to be use in loops, where a separator shall be inserted between each
1341 * element, but not before the first one. */
1351 r = fputs(separator, f);
1363 int open_tmpfile_unlinkable(const char *directory, int flags) {
1368 r = tmp_dir(&directory);
1373 /* Returns an unlinked temporary file that cannot be linked into the file system anymore */
1375 /* Try O_TMPFILE first, if it is supported */
1376 fd = open(directory, flags|O_TMPFILE|O_EXCL, S_IRUSR|S_IWUSR);
1380 /* Fall back to unguessable name + unlinking */
1381 p = strjoina(directory, "/systemd-tmp-XXXXXX");
1383 fd = mkostemp_safe(p);
1392 #if 0 /// UNNEEDED by elogind
1393 int open_tmpfile_linkable(const char *target, int flags, char **ret_path) {
1394 _cleanup_free_ char *tmp = NULL;
1400 /* Don't allow O_EXCL, as that has a special meaning for O_TMPFILE */
1401 assert((flags & O_EXCL) == 0);
1403 /* Creates a temporary file, that shall be renamed to "target" later. If possible, this uses O_TMPFILE – in
1404 * which case "ret_path" will be returned as NULL. If not possible a the tempoary path name used is returned in
1405 * "ret_path". Use link_tmpfile() below to rename the result after writing the file in full. */
1408 _cleanup_free_ char *dn = NULL;
1410 dn = dirname_malloc(target);
1414 fd = open(dn, O_TMPFILE|flags, 0640);
1420 log_debug_errno(errno, "Failed to use O_TMPFILE on %s: %m", dn);
1423 r = tempfn_random(target, NULL, &tmp);
1427 fd = open(tmp, O_CREAT|O_EXCL|O_NOFOLLOW|O_NOCTTY|flags, 0640);
1438 int open_serialization_fd(const char *ident) {
1441 fd = memfd_create(ident, MFD_CLOEXEC);
1445 path = getpid_cached() == 1 ? "/run/systemd" : "/tmp";
1446 fd = open_tmpfile_unlinkable(path, O_RDWR|O_CLOEXEC);
1450 log_debug("Serializing %s to %s.", ident, path);
1452 log_debug("Serializing %s to memfd.", ident);
1457 #if 0 /// UNNEEDED by elogind
1458 int link_tmpfile(int fd, const char *path, const char *target) {
1463 /* Moves a temporary file created with open_tmpfile() above into its final place. if "path" is NULL an fd
1464 * created with O_TMPFILE is assumed, and linkat() is used. Otherwise it is assumed O_TMPFILE is not supported
1465 * on the directory, and renameat2() is used instead.
1467 * Note that in both cases we will not replace existing files. This is because linkat() does not support this
1468 * operation currently (renameat2() does), and there is no nice way to emulate this. */
1471 if (rename_noreplace(AT_FDCWD, path, AT_FDCWD, target) < 0)
1474 char proc_fd_path[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(fd) + 1];
1476 xsprintf(proc_fd_path, "/proc/self/fd/%i", fd);
1478 if (linkat(AT_FDCWD, proc_fd_path, AT_FDCWD, target, AT_SYMLINK_FOLLOW) < 0)
1485 int read_nul_string(FILE *f, char **ret) {
1486 _cleanup_free_ char *x = NULL;
1487 size_t allocated = 0, n = 0;
1492 /* Reads a NUL-terminated string from the specified file. */
1497 if (!GREEDY_REALLOC(x, allocated, n+2))
1501 if (c == 0) /* Terminate at NUL byte */
1506 break; /* Terminate at EOF */
1526 int mkdtemp_malloc(const char *template, char **ret) {
1532 p = strdup(template);
1546 static inline void funlockfilep(FILE **f) {
1550 int read_line(FILE *f, size_t limit, char **ret) {
1551 _cleanup_free_ char *buffer = NULL;
1552 size_t n = 0, allocated = 0, count = 0;
1556 /* Something like a bounded version of getline().
1558 * Considers EOF, \n and \0 end of line delimiters, and does not include these delimiters in the string
1561 * Returns the number of bytes read from the files (i.e. including delimiters — this hence usually differs from
1562 * the number of characters in the returned string). When EOF is hit, 0 is returned.
1564 * The input parameter limit is the maximum numbers of characters in the returned string, i.e. excluding
1565 * delimiters. If the limit is hit we fail and return -ENOBUFS.
1567 * If a line shall be skipped ret may be initialized as NULL. */
1570 if (!GREEDY_REALLOC(buffer, allocated, 1))
1575 _unused_ _cleanup_(funlockfilep) FILE *flocked = f;
1585 c = fgetc_unlocked(f);
1587 /* if we read an error, and have no data to return, then propagate the error */
1588 if (ferror_unlocked(f) && n == 0)
1589 return errno > 0 ? -errno : -EIO;
1596 if (IN_SET(c, '\n', 0)) /* Reached a delimiter */
1600 if (!GREEDY_REALLOC(buffer, allocated, n + 2))
1603 buffer[n] = (char) c;