1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 This file is part of systemd.
5 Copyright 2010 Lennart Poettering
7 systemd is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as published by
9 the Free Software Foundation; either version 2.1 of the License, or
10 (at your option) any later version.
12 systemd is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public License
18 along with systemd; If not, see <http://www.gnu.org/licenses/>.
26 #include <stdio_ext.h>
31 #include <sys/types.h>
34 #include "alloc-util.h"
42 #include "hexdecoct.h"
46 #include "parse-util.h"
47 #include "path-util.h"
48 #include "process-util.h"
49 #include "random-util.h"
50 #include "stdio-util.h"
51 #include "string-util.h"
53 //#include "time-util.h"
54 #include "umask-util.h"
57 #define READ_FULL_BYTES_MAX (4U*1024U*1024U)
59 int write_string_stream_ts(
62 WriteStringFileFlags flags,
63 struct timespec *ts) {
73 needs_nl = !(flags & WRITE_STRING_FILE_AVOID_NEWLINE) && !endswith(line, "\n");
75 if (needs_nl && (flags & WRITE_STRING_FILE_DISABLE_BUFFER)) {
76 /* If STDIO buffering was disabled, then let's append the newline character to the string itself, so
77 * that the write goes out in one go, instead of two */
79 line = strjoina(line, "\n");
83 if (fputs(line, f) == EOF)
87 if (fputc('\n', f) == EOF)
91 struct timespec twice[2] = {*ts, *ts};
93 if (futimens(fileno(f), twice) < 0)
97 if (flags & WRITE_STRING_FILE_SYNC)
98 return fflush_sync_and_check(f);
100 return fflush_and_check(f);
103 static int write_string_file_atomic(
106 WriteStringFileFlags flags,
107 struct timespec *ts) {
109 _cleanup_fclose_ FILE *f = NULL;
110 _cleanup_free_ char *p = NULL;
116 r = fopen_temporary(fn, &f, &p);
120 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
121 (void) fchmod_umask(fileno(f), 0644);
123 r = write_string_stream_ts(f, line, flags, ts);
127 if (rename(p, fn) < 0) {
139 int write_string_file_ts(
142 WriteStringFileFlags flags,
143 struct timespec *ts) {
145 _cleanup_fclose_ FILE *f = NULL;
151 /* We don't know how to verify whether the file contents was already on-disk. */
152 assert(!((flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE) && (flags & WRITE_STRING_FILE_SYNC)));
154 if (flags & WRITE_STRING_FILE_ATOMIC) {
155 assert(flags & WRITE_STRING_FILE_CREATE);
157 r = write_string_file_atomic(fn, line, flags, ts);
165 if (flags & WRITE_STRING_FILE_CREATE) {
174 /* We manually build our own version of fopen(..., "we") that
175 * works without O_CREAT */
176 fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY);
182 f = fdopen(fd, "we");
190 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
192 if (flags & WRITE_STRING_FILE_DISABLE_BUFFER)
193 setvbuf(f, NULL, _IONBF, 0);
195 r = write_string_stream_ts(f, line, flags, ts);
202 if (!(flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE))
207 /* OK, the operation failed, but let's see if the right
208 * contents in place already. If so, eat up the error. */
210 q = verify_file(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE));
217 int read_one_line_file(const char *fn, char **line) {
218 _cleanup_fclose_ FILE *f = NULL;
228 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
230 r = read_line(f, LONG_LINE_MAX, line);
231 return r < 0 ? r : 0;
234 int verify_file(const char *fn, const char *blob, bool accept_extra_nl) {
235 _cleanup_fclose_ FILE *f = NULL;
236 _cleanup_free_ char *buf = NULL;
244 if (accept_extra_nl && endswith(blob, "\n"))
245 accept_extra_nl = false;
247 buf = malloc(l + accept_extra_nl + 1);
255 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
257 /* We try to read one byte more than we need, so that we know whether we hit eof */
259 k = fread(buf, 1, l + accept_extra_nl + 1, f);
261 return errno > 0 ? -errno : -EIO;
263 if (k != l && k != l + accept_extra_nl)
265 if (memcmp(buf, blob, l) != 0)
267 if (k > l && buf[l] != '\n')
273 int read_full_stream(FILE *f, char **contents, size_t *size) {
275 _cleanup_free_ char *buf = NULL;
281 if (fstat(fileno(f), &st) < 0)
286 if (S_ISREG(st.st_mode)) {
289 if (st.st_size > READ_FULL_BYTES_MAX)
292 /* Start with the right file size, but be prepared for files from /proc which generally report a file
293 * size of 0. Note that we increase the size to read here by one, so that the first read attempt
294 * already makes us notice the EOF. */
304 t = realloc(buf, n + 1);
310 k = fread(buf + l, 1, n - l, f);
315 return errno > 0 ? -errno : -EIO;
320 /* We aren't expecting fread() to return a short read outside
321 * of (error && eof), assert buffer is full and enlarge buffer.
326 if (n >= READ_FULL_BYTES_MAX)
329 n = MIN(n * 2, READ_FULL_BYTES_MAX);
333 *contents = TAKE_PTR(buf);
341 int read_full_file(const char *fn, char **contents, size_t *size) {
342 _cleanup_fclose_ FILE *f = NULL;
351 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
353 return read_full_stream(f, contents, size);
356 static int parse_env_file_internal(
360 int (*push) (const char *filename, unsigned line,
361 const char *key, char *value, void *userdata, int *n_pushed),
365 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;
366 _cleanup_free_ char *contents = NULL, *key = NULL, *value = NULL;
378 SINGLE_QUOTE_VALUE_ESCAPE,
380 DOUBLE_QUOTE_VALUE_ESCAPE,
388 r = read_full_stream(f, &contents, NULL);
390 r = read_full_file(fname, &contents, NULL);
394 for (p = contents; *p; p++) {
400 if (strchr(COMMENTS, c))
402 else if (!strchr(WHITESPACE, c)) {
404 last_key_whitespace = (size_t) -1;
406 if (!GREEDY_REALLOC(key, key_alloc, n_key+2))
414 if (strchr(newline, c)) {
418 } else if (c == '=') {
420 last_value_whitespace = (size_t) -1;
422 if (!strchr(WHITESPACE, c))
423 last_key_whitespace = (size_t) -1;
424 else if (last_key_whitespace == (size_t) -1)
425 last_key_whitespace = n_key;
427 if (!GREEDY_REALLOC(key, key_alloc, n_key+2))
436 if (strchr(newline, c)) {
444 /* strip trailing whitespace from key */
445 if (last_key_whitespace != (size_t) -1)
446 key[last_key_whitespace] = 0;
448 r = push(fname, line, key, value, userdata, n_pushed);
454 value_alloc = n_value = 0;
456 } else if (c == '\'')
457 state = SINGLE_QUOTE_VALUE;
459 state = DOUBLE_QUOTE_VALUE;
461 state = VALUE_ESCAPE;
462 else if (!strchr(WHITESPACE, c)) {
465 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
468 value[n_value++] = c;
474 if (strchr(newline, c)) {
483 /* Chomp off trailing whitespace from value */
484 if (last_value_whitespace != (size_t) -1)
485 value[last_value_whitespace] = 0;
487 /* strip trailing whitespace from key */
488 if (last_key_whitespace != (size_t) -1)
489 key[last_key_whitespace] = 0;
491 r = push(fname, line, key, value, userdata, n_pushed);
497 value_alloc = n_value = 0;
499 } else if (c == '\\') {
500 state = VALUE_ESCAPE;
501 last_value_whitespace = (size_t) -1;
503 if (!strchr(WHITESPACE, c))
504 last_value_whitespace = (size_t) -1;
505 else if (last_value_whitespace == (size_t) -1)
506 last_value_whitespace = n_value;
508 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
511 value[n_value++] = c;
519 if (!strchr(newline, c)) {
520 /* Escaped newlines we eat up entirely */
521 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
524 value[n_value++] = c;
528 case SINGLE_QUOTE_VALUE:
532 state = SINGLE_QUOTE_VALUE_ESCAPE;
534 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
537 value[n_value++] = c;
542 case SINGLE_QUOTE_VALUE_ESCAPE:
543 state = SINGLE_QUOTE_VALUE;
545 if (!strchr(newline, c)) {
546 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
549 value[n_value++] = c;
553 case DOUBLE_QUOTE_VALUE:
557 state = DOUBLE_QUOTE_VALUE_ESCAPE;
559 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
562 value[n_value++] = c;
567 case DOUBLE_QUOTE_VALUE_ESCAPE:
568 state = DOUBLE_QUOTE_VALUE;
570 if (!strchr(newline, c)) {
571 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
574 value[n_value++] = c;
580 state = COMMENT_ESCAPE;
581 else if (strchr(newline, c)) {
598 SINGLE_QUOTE_VALUE_ESCAPE,
600 DOUBLE_QUOTE_VALUE_ESCAPE)) {
608 if (last_value_whitespace != (size_t) -1)
609 value[last_value_whitespace] = 0;
611 /* strip trailing whitespace from key */
612 if (last_key_whitespace != (size_t) -1)
613 key[last_key_whitespace] = 0;
615 r = push(fname, line, key, value, userdata, n_pushed);
625 static int check_utf8ness_and_warn(
626 const char *filename, unsigned line,
627 const char *key, char *value) {
629 if (!utf8_is_valid(key)) {
630 _cleanup_free_ char *p = NULL;
632 p = utf8_escape_invalid(key);
633 log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.", strna(filename), line, p);
637 if (value && !utf8_is_valid(value)) {
638 _cleanup_free_ char *p = NULL;
640 p = utf8_escape_invalid(value);
641 log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, p);
648 static int parse_env_file_push(
649 const char *filename, unsigned line,
650 const char *key, char *value,
655 va_list aq, *ap = userdata;
658 r = check_utf8ness_and_warn(filename, line, key, value);
664 while ((k = va_arg(aq, const char *))) {
667 v = va_arg(aq, char **);
689 const char *newline, ...) {
697 va_start(ap, newline);
698 r = parse_env_file_internal(NULL, fname, newline, parse_env_file_push, &ap, &n_pushed);
701 return r < 0 ? r : n_pushed;
704 #if 0 /// UNNEEDED by elogind
705 static int load_env_file_push(
706 const char *filename, unsigned line,
707 const char *key, char *value,
710 char ***m = userdata;
714 r = check_utf8ness_and_warn(filename, line, key, value);
718 p = strjoin(key, "=", value);
722 r = strv_env_replace(m, p);
735 int load_env_file(FILE *f, const char *fname, const char *newline, char ***rl) {
742 r = parse_env_file_internal(f, fname, newline, load_env_file_push, &m, NULL);
753 static int load_env_file_push_pairs(
754 const char *filename, unsigned line,
755 const char *key, char *value,
758 char ***m = userdata;
761 r = check_utf8ness_and_warn(filename, line, key, value);
765 r = strv_extend(m, key);
770 r = strv_extend(m, "");
774 r = strv_push(m, value);
785 int load_env_file_pairs(FILE *f, const char *fname, const char *newline, char ***rl) {
792 r = parse_env_file_internal(f, fname, newline, load_env_file_push_pairs, &m, NULL);
801 #if 0 /// UNNEEDED by elogind
803 static int merge_env_file_push(
804 const char *filename, unsigned line,
805 const char *key, char *value,
809 char ***env = userdata;
810 char *expanded_value;
815 log_error("%s:%u: invalid syntax (around \"%s\"), ignoring.", strna(filename), line, key);
819 if (!env_name_is_valid(key)) {
820 log_error("%s:%u: invalid variable name \"%s\", ignoring.", strna(filename), line, key);
825 expanded_value = replace_env(value, *env,
826 REPLACE_ENV_USE_ENVIRONMENT|
827 REPLACE_ENV_ALLOW_BRACELESS|
828 REPLACE_ENV_ALLOW_EXTENDED);
832 free_and_replace(value, expanded_value);
834 return load_env_file_push(filename, line, key, value, env, n_pushed);
842 /* NOTE: this function supports braceful and braceless variable expansions,
843 * plus "extended" substitutions, unlike other exported parsing functions.
846 return parse_env_file_internal(f, fname, NEWLINE, merge_env_file_push, env, NULL);
849 static void write_env_var(FILE *f, const char *v) {
855 fputs_unlocked(v, f);
856 fputc_unlocked('\n', f);
861 fwrite_unlocked(v, 1, p-v, f);
863 if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE SHELL_NEED_QUOTES)) {
864 fputc_unlocked('\"', f);
867 if (strchr(SHELL_NEED_ESCAPE, *p))
868 fputc_unlocked('\\', f);
870 fputc_unlocked(*p, f);
873 fputc_unlocked('\"', f);
875 fputs_unlocked(p, f);
877 fputc_unlocked('\n', f);
880 int write_env_file(const char *fname, char **l) {
881 _cleanup_fclose_ FILE *f = NULL;
882 _cleanup_free_ char *p = NULL;
888 r = fopen_temporary(fname, &f, &p);
892 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
893 (void) fchmod_umask(fileno(f), 0644);
896 write_env_var(f, *i);
898 r = fflush_and_check(f);
900 if (rename(p, fname) >= 0)
910 int executable_is_script(const char *path, char **interpreter) {
911 _cleanup_free_ char *line = NULL;
918 r = read_one_line_file(path, &line);
919 if (r == -ENOBUFS) /* First line overly long? if so, then it's not a script */
924 if (!startswith(line, "#!"))
927 ans = strstrip(line + 2);
928 len = strcspn(ans, " \t");
933 ans = strndup(ans, len);
943 * Retrieve one field from a file like /proc/self/status. pattern
944 * should not include whitespace or the delimiter (':'). pattern matches only
945 * the beginning of a line. Whitespace before ':' is skipped. Whitespace and
946 * zeros after the ':' will be skipped. field must be freed afterwards.
947 * terminator specifies the terminating characters of the field value (not
948 * included in the value).
950 int get_proc_field(const char *filename, const char *pattern, const char *terminator, char **field) {
951 _cleanup_free_ char *status = NULL;
961 r = read_full_file(filename, &status, NULL);
971 t = strstr(t, pattern);
975 /* Check that pattern occurs in beginning of line. */
976 pattern_ok = (t == status || t[-1] == '\n');
978 t += strlen(pattern);
980 } while (!pattern_ok);
982 t += strspn(t, " \t");
991 t += strspn(t, " \t");
993 /* Also skip zeros, because when this is used for
994 * capabilities, we don't want the zeros. This way the
995 * same capability set always maps to the same string,
996 * irrespective of the total capability set size. For
997 * other numbers it shouldn't matter. */
999 /* Back off one char if there's nothing but whitespace
1001 if (!*t || isspace(*t))
1005 len = strcspn(t, terminator);
1007 f = strndup(t, len);
1015 DIR *xopendirat(int fd, const char *name, int flags) {
1019 assert(!(flags & O_CREAT));
1021 nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0);
1034 #if 0 /// UNNEEDED by elogind
1035 static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) {
1042 if (!path_strv_resolve_uniq(search, root))
1045 STRV_FOREACH(i, search) {
1046 _cleanup_free_ char *p = NULL;
1050 p = strjoin(root, *i, "/", path);
1052 p = strjoin(*i, "/", path);
1062 if (errno != ENOENT)
1069 int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) {
1070 _cleanup_strv_free_ char **copy = NULL;
1076 if (path_is_absolute(path)) {
1079 f = fopen(path, mode);
1088 copy = strv_copy((char**) search);
1092 return search_and_fopen_internal(path, mode, root, copy, _f);
1095 int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) {
1096 _cleanup_strv_free_ char **s = NULL;
1098 if (path_is_absolute(path)) {
1101 f = fopen(path, mode);
1110 s = strv_split_nulstr(search);
1114 return search_and_fopen_internal(path, mode, root, s, _f);
1118 int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
1127 r = tempfn_xxxxxx(path, NULL, &t);
1131 fd = mkostemp_safe(t);
1137 f = fdopen(fd, "we");
1151 int fflush_and_check(FILE *f) {
1158 return errno > 0 ? -errno : -EIO;
1163 int fflush_sync_and_check(FILE *f) {
1168 r = fflush_and_check(f);
1172 if (fsync(fileno(f)) < 0)
1175 r = fsync_directory_of_file(fileno(f));
1182 /* This is much like mkostemp() but is subject to umask(). */
1183 int mkostemp_safe(char *pattern) {
1184 _cleanup_umask_ mode_t u = 0;
1191 fd = mkostemp(pattern, O_CLOEXEC);
1198 int tempfn_xxxxxx(const char *p, const char *extra, char **ret) {
1210 * /foo/bar/.#<extra>waldoXXXXXX
1214 if (!filename_is_valid(fn))
1217 extra = strempty(extra);
1219 t = new(char, strlen(p) + 2 + strlen(extra) + 6 + 1);
1223 strcpy(stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn), "XXXXXX");
1225 *ret = path_kill_slashes(t);
1229 int tempfn_random(const char *p, const char *extra, char **ret) {
1243 * /foo/bar/.#<extra>waldobaa2a261115984a9
1247 if (!filename_is_valid(fn))
1250 extra = strempty(extra);
1252 t = new(char, strlen(p) + 2 + strlen(extra) + 16 + 1);
1256 x = stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn);
1259 for (i = 0; i < 16; i++) {
1260 *(x++) = hexchar(u & 0xF);
1266 *ret = path_kill_slashes(t);
1270 #if 0 /// UNNEEDED by elogind
1271 int tempfn_random_child(const char *p, const char *extra, char **ret) {
1282 * /foo/bar/waldo/.#<extra>3c2b6219aa75d7d0
1291 extra = strempty(extra);
1293 t = new(char, strlen(p) + 3 + strlen(extra) + 16 + 1);
1297 x = stpcpy(stpcpy(stpcpy(t, p), "/.#"), extra);
1300 for (i = 0; i < 16; i++) {
1301 *(x++) = hexchar(u & 0xF);
1307 *ret = path_kill_slashes(t);
1311 int write_timestamp_file_atomic(const char *fn, usec_t n) {
1312 char ln[DECIMAL_STR_MAX(n)+2];
1314 /* Creates a "timestamp" file, that contains nothing but a
1315 * usec_t timestamp, formatted in ASCII. */
1317 if (n <= 0 || n >= USEC_INFINITY)
1320 xsprintf(ln, USEC_FMT "\n", n);
1322 return write_string_file(fn, ln, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
1325 int read_timestamp_file(const char *fn, usec_t *ret) {
1326 _cleanup_free_ char *ln = NULL;
1330 r = read_one_line_file(fn, &ln);
1334 r = safe_atou64(ln, &t);
1338 if (t <= 0 || t >= (uint64_t) USEC_INFINITY)
1345 int fputs_with_space(FILE *f, const char *s, const char *separator, bool *space) {
1350 /* Outputs the specified string with fputs(), but optionally prefixes it with a separator. The *space parameter
1351 * when specified shall initially point to a boolean variable initialized to false. It is set to true after the
1352 * first invocation. This call is supposed to be use in loops, where a separator shall be inserted between each
1353 * element, but not before the first one. */
1363 r = fputs(separator, f);
1375 int open_tmpfile_unlinkable(const char *directory, int flags) {
1380 r = tmp_dir(&directory);
1385 /* Returns an unlinked temporary file that cannot be linked into the file system anymore */
1387 /* Try O_TMPFILE first, if it is supported */
1388 fd = open(directory, flags|O_TMPFILE|O_EXCL, S_IRUSR|S_IWUSR);
1392 /* Fall back to unguessable name + unlinking */
1393 p = strjoina(directory, "/systemd-tmp-XXXXXX");
1395 fd = mkostemp_safe(p);
1404 #if 0 /// UNNEEDED by elogind
1405 int open_tmpfile_linkable(const char *target, int flags, char **ret_path) {
1406 _cleanup_free_ char *tmp = NULL;
1412 /* Don't allow O_EXCL, as that has a special meaning for O_TMPFILE */
1413 assert((flags & O_EXCL) == 0);
1415 /* Creates a temporary file, that shall be renamed to "target" later. If possible, this uses O_TMPFILE – in
1416 * which case "ret_path" will be returned as NULL. If not possible a the tempoary path name used is returned in
1417 * "ret_path". Use link_tmpfile() below to rename the result after writing the file in full. */
1420 _cleanup_free_ char *dn = NULL;
1422 dn = dirname_malloc(target);
1426 fd = open(dn, O_TMPFILE|flags, 0640);
1432 log_debug_errno(errno, "Failed to use O_TMPFILE on %s: %m", dn);
1435 r = tempfn_random(target, NULL, &tmp);
1439 fd = open(tmp, O_CREAT|O_EXCL|O_NOFOLLOW|O_NOCTTY|flags, 0640);
1443 *ret_path = TAKE_PTR(tmp);
1449 int open_serialization_fd(const char *ident) {
1452 fd = memfd_create(ident, MFD_CLOEXEC);
1456 path = getpid_cached() == 1 ? "/run/systemd" : "/tmp";
1457 fd = open_tmpfile_unlinkable(path, O_RDWR|O_CLOEXEC);
1461 log_debug("Serializing %s to %s.", ident, path);
1463 log_debug("Serializing %s to memfd.", ident);
1468 #if 0 /// UNNEEDED by elogind
1469 int link_tmpfile(int fd, const char *path, const char *target) {
1474 /* Moves a temporary file created with open_tmpfile() above into its final place. if "path" is NULL an fd
1475 * created with O_TMPFILE is assumed, and linkat() is used. Otherwise it is assumed O_TMPFILE is not supported
1476 * on the directory, and renameat2() is used instead.
1478 * Note that in both cases we will not replace existing files. This is because linkat() does not support this
1479 * operation currently (renameat2() does), and there is no nice way to emulate this. */
1482 if (rename_noreplace(AT_FDCWD, path, AT_FDCWD, target) < 0)
1485 char proc_fd_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(fd) + 1];
1487 xsprintf(proc_fd_path, "/proc/self/fd/%i", fd);
1489 if (linkat(AT_FDCWD, proc_fd_path, AT_FDCWD, target, AT_SYMLINK_FOLLOW) < 0)
1496 int read_nul_string(FILE *f, char **ret) {
1497 _cleanup_free_ char *x = NULL;
1498 size_t allocated = 0, n = 0;
1503 /* Reads a NUL-terminated string from the specified file. */
1508 if (!GREEDY_REALLOC(x, allocated, n+2))
1512 if (c == 0) /* Terminate at NUL byte */
1517 break; /* Terminate at EOF */
1536 int mkdtemp_malloc(const char *template, char **ret) {
1542 p = strdup(template);
1556 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, funlockfile);
1558 int read_line(FILE *f, size_t limit, char **ret) {
1559 _cleanup_free_ char *buffer = NULL;
1560 size_t n = 0, allocated = 0, count = 0;
1564 /* Something like a bounded version of getline().
1566 * Considers EOF, \n and \0 end of line delimiters, and does not include these delimiters in the string
1569 * Returns the number of bytes read from the files (i.e. including delimiters — this hence usually differs from
1570 * the number of characters in the returned string). When EOF is hit, 0 is returned.
1572 * The input parameter limit is the maximum numbers of characters in the returned string, i.e. excluding
1573 * delimiters. If the limit is hit we fail and return -ENOBUFS.
1575 * If a line shall be skipped ret may be initialized as NULL. */
1578 if (!GREEDY_REALLOC(buffer, allocated, 1))
1583 _unused_ _cleanup_(funlockfilep) FILE *flocked = f;
1593 c = fgetc_unlocked(f);
1595 /* if we read an error, and have no data to return, then propagate the error */
1596 if (ferror_unlocked(f) && n == 0)
1597 return errno > 0 ? -errno : -EIO;
1604 if (IN_SET(c, '\n', 0)) /* Reached a delimiter */
1608 if (!GREEDY_REALLOC(buffer, allocated, n + 2))
1611 buffer[n] = (char) c;
1621 *ret = TAKE_PTR(buffer);