1 /* SPDX-License-Identifier: LGPL-2.1+ */
13 #include <sys/types.h>
16 #include "alloc-util.h"
24 #include "hexdecoct.h"
28 #include "parse-util.h"
29 #include "path-util.h"
30 #include "process-util.h"
31 #include "random-util.h"
32 #include "stdio-util.h"
33 #include "string-util.h"
35 //#include "time-util.h"
36 #include "umask-util.h"
39 #define READ_FULL_BYTES_MAX (4U*1024U*1024U)
41 int write_string_stream_ts(
44 WriteStringFileFlags flags,
45 struct timespec *ts) {
56 needs_nl = !(flags & WRITE_STRING_FILE_AVOID_NEWLINE) && !endswith(line, "\n");
58 if (needs_nl && (flags & WRITE_STRING_FILE_DISABLE_BUFFER)) {
59 /* If STDIO buffering was disabled, then let's append the newline character to the string itself, so
60 * that the write goes out in one go, instead of two */
62 line = strjoina(line, "\n");
66 if (fputs(line, f) == EOF)
70 if (fputc('\n', f) == EOF)
73 if (flags & WRITE_STRING_FILE_SYNC)
74 r = fflush_sync_and_check(f);
76 r = fflush_and_check(f);
81 struct timespec twice[2] = {*ts, *ts};
83 if (futimens(fileno(f), twice) < 0)
90 static int write_string_file_atomic(
93 WriteStringFileFlags flags,
94 struct timespec *ts) {
96 _cleanup_fclose_ FILE *f = NULL;
97 _cleanup_free_ char *p = NULL;
103 r = fopen_temporary(fn, &f, &p);
107 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
108 (void) fchmod_umask(fileno(f), 0644);
110 r = write_string_stream_ts(f, line, flags, ts);
114 if (rename(p, fn) < 0) {
126 int write_string_file_ts(
129 WriteStringFileFlags flags,
130 struct timespec *ts) {
132 _cleanup_fclose_ FILE *f = NULL;
138 /* We don't know how to verify whether the file contents was already on-disk. */
139 assert(!((flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE) && (flags & WRITE_STRING_FILE_SYNC)));
141 if (flags & WRITE_STRING_FILE_ATOMIC) {
142 assert(flags & WRITE_STRING_FILE_CREATE);
144 r = write_string_file_atomic(fn, line, flags, ts);
152 if (flags & WRITE_STRING_FILE_CREATE) {
161 /* We manually build our own version of fopen(..., "we") that
162 * works without O_CREAT */
163 fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY);
169 f = fdopen(fd, "we");
177 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
179 if (flags & WRITE_STRING_FILE_DISABLE_BUFFER)
180 setvbuf(f, NULL, _IONBF, 0);
182 r = write_string_stream_ts(f, line, flags, ts);
189 if (!(flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE))
194 /* OK, the operation failed, but let's see if the right
195 * contents in place already. If so, eat up the error. */
197 q = verify_file(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE));
204 int write_string_filef(
206 WriteStringFileFlags flags,
207 const char *format, ...) {
209 _cleanup_free_ char *p = NULL;
213 va_start(ap, format);
214 r = vasprintf(&p, format, ap);
220 return write_string_file(fn, p, flags);
223 int read_one_line_file(const char *fn, char **line) {
224 _cleanup_fclose_ FILE *f = NULL;
234 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
236 r = read_line(f, LONG_LINE_MAX, line);
237 return r < 0 ? r : 0;
240 int verify_file(const char *fn, const char *blob, bool accept_extra_nl) {
241 _cleanup_fclose_ FILE *f = NULL;
242 _cleanup_free_ char *buf = NULL;
250 if (accept_extra_nl && endswith(blob, "\n"))
251 accept_extra_nl = false;
253 buf = malloc(l + accept_extra_nl + 1);
261 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
263 /* We try to read one byte more than we need, so that we know whether we hit eof */
265 k = fread(buf, 1, l + accept_extra_nl + 1, f);
267 return errno > 0 ? -errno : -EIO;
269 if (k != l && k != l + accept_extra_nl)
271 if (memcmp(buf, blob, l) != 0)
273 if (k > l && buf[l] != '\n')
279 int read_full_stream(FILE *f, char **contents, size_t *size) {
280 _cleanup_free_ char *buf = NULL;
291 if (fd >= 0) { /* If the FILE* object is backed by an fd (as opposed to memory or such, see fmemopen(), let's
292 * optimize our buffering) */
294 if (fstat(fileno(f), &st) < 0)
297 if (S_ISREG(st.st_mode)) {
300 if (st.st_size > READ_FULL_BYTES_MAX)
303 /* Start with the right file size, but be prepared for files from /proc which generally report a file
304 * size of 0. Note that we increase the size to read here by one, so that the first read attempt
305 * already makes us notice the EOF. */
316 t = realloc(buf, n + 1);
322 k = fread(buf + l, 1, n - l, f);
327 return errno > 0 ? -errno : -EIO;
332 /* We aren't expecting fread() to return a short read outside
333 * of (error && eof), assert buffer is full and enlarge buffer.
338 if (n >= READ_FULL_BYTES_MAX)
341 n = MIN(n * 2, READ_FULL_BYTES_MAX);
345 *contents = TAKE_PTR(buf);
353 int read_full_file(const char *fn, char **contents, size_t *size) {
354 _cleanup_fclose_ FILE *f = NULL;
363 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
365 return read_full_stream(f, contents, size);
368 static int parse_env_file_internal(
372 int (*push) (const char *filename, unsigned line,
373 const char *key, char *value, void *userdata, int *n_pushed),
377 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;
378 _cleanup_free_ char *contents = NULL, *key = NULL, *value = NULL;
390 SINGLE_QUOTE_VALUE_ESCAPE,
392 DOUBLE_QUOTE_VALUE_ESCAPE,
400 r = read_full_stream(f, &contents, NULL);
402 r = read_full_file(fname, &contents, NULL);
406 for (p = contents; *p; p++) {
412 if (strchr(COMMENTS, c))
414 else if (!strchr(WHITESPACE, c)) {
416 last_key_whitespace = (size_t) -1;
418 if (!GREEDY_REALLOC(key, key_alloc, n_key+2))
426 if (strchr(newline, c)) {
430 } else if (c == '=') {
432 last_value_whitespace = (size_t) -1;
434 if (!strchr(WHITESPACE, c))
435 last_key_whitespace = (size_t) -1;
436 else if (last_key_whitespace == (size_t) -1)
437 last_key_whitespace = n_key;
439 if (!GREEDY_REALLOC(key, key_alloc, n_key+2))
448 if (strchr(newline, c)) {
456 /* strip trailing whitespace from key */
457 if (last_key_whitespace != (size_t) -1)
458 key[last_key_whitespace] = 0;
460 r = push(fname, line, key, value, userdata, n_pushed);
466 value_alloc = n_value = 0;
468 } else if (c == '\'')
469 state = SINGLE_QUOTE_VALUE;
471 state = DOUBLE_QUOTE_VALUE;
473 state = VALUE_ESCAPE;
474 else if (!strchr(WHITESPACE, c)) {
477 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
480 value[n_value++] = c;
486 if (strchr(newline, c)) {
495 /* Chomp off trailing whitespace from value */
496 if (last_value_whitespace != (size_t) -1)
497 value[last_value_whitespace] = 0;
499 /* strip trailing whitespace from key */
500 if (last_key_whitespace != (size_t) -1)
501 key[last_key_whitespace] = 0;
503 r = push(fname, line, key, value, userdata, n_pushed);
509 value_alloc = n_value = 0;
511 } else if (c == '\\') {
512 state = VALUE_ESCAPE;
513 last_value_whitespace = (size_t) -1;
515 if (!strchr(WHITESPACE, c))
516 last_value_whitespace = (size_t) -1;
517 else if (last_value_whitespace == (size_t) -1)
518 last_value_whitespace = n_value;
520 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
523 value[n_value++] = c;
531 if (!strchr(newline, c)) {
532 /* Escaped newlines we eat up entirely */
533 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
536 value[n_value++] = c;
540 case SINGLE_QUOTE_VALUE:
544 state = SINGLE_QUOTE_VALUE_ESCAPE;
546 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
549 value[n_value++] = c;
554 case SINGLE_QUOTE_VALUE_ESCAPE:
555 state = SINGLE_QUOTE_VALUE;
557 if (!strchr(newline, c)) {
558 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
561 value[n_value++] = c;
565 case DOUBLE_QUOTE_VALUE:
569 state = DOUBLE_QUOTE_VALUE_ESCAPE;
571 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
574 value[n_value++] = c;
579 case DOUBLE_QUOTE_VALUE_ESCAPE:
580 state = DOUBLE_QUOTE_VALUE;
582 if (!strchr(newline, c)) {
583 if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
586 value[n_value++] = c;
592 state = COMMENT_ESCAPE;
593 else if (strchr(newline, c)) {
610 SINGLE_QUOTE_VALUE_ESCAPE,
612 DOUBLE_QUOTE_VALUE_ESCAPE)) {
620 if (last_value_whitespace != (size_t) -1)
621 value[last_value_whitespace] = 0;
623 /* strip trailing whitespace from key */
624 if (last_key_whitespace != (size_t) -1)
625 key[last_key_whitespace] = 0;
627 r = push(fname, line, key, value, userdata, n_pushed);
637 static int check_utf8ness_and_warn(
638 const char *filename, unsigned line,
639 const char *key, char *value) {
641 if (!utf8_is_valid(key)) {
642 _cleanup_free_ char *p = NULL;
644 p = utf8_escape_invalid(key);
645 log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.", strna(filename), line, p);
649 if (value && !utf8_is_valid(value)) {
650 _cleanup_free_ char *p = NULL;
652 p = utf8_escape_invalid(value);
653 log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, p);
660 static int parse_env_file_push(
661 const char *filename, unsigned line,
662 const char *key, char *value,
667 va_list aq, *ap = userdata;
670 r = check_utf8ness_and_warn(filename, line, key, value);
676 while ((k = va_arg(aq, const char *))) {
679 v = va_arg(aq, char **);
712 r = parse_env_file_internal(f, fname, newline, parse_env_file_push, &aq, &n_pushed);
729 va_start(ap, newline);
730 r = parse_env_filev(f, fname, newline, ap);
736 #if 0 /// UNNEEDED by elogind
737 static int load_env_file_push(
738 const char *filename, unsigned line,
739 const char *key, char *value,
742 char ***m = userdata;
746 r = check_utf8ness_and_warn(filename, line, key, value);
750 p = strjoin(key, "=", value);
754 r = strv_env_replace(m, p);
767 int load_env_file(FILE *f, const char *fname, const char *newline, char ***rl) {
774 r = parse_env_file_internal(f, fname, newline, load_env_file_push, &m, NULL);
785 static int load_env_file_push_pairs(
786 const char *filename, unsigned line,
787 const char *key, char *value,
790 char ***m = userdata;
793 r = check_utf8ness_and_warn(filename, line, key, value);
797 r = strv_extend(m, key);
802 r = strv_extend(m, "");
806 r = strv_push(m, value);
817 int load_env_file_pairs(FILE *f, const char *fname, const char *newline, char ***rl) {
824 r = parse_env_file_internal(f, fname, newline, load_env_file_push_pairs, &m, NULL);
833 #if 0 /// UNNEEDED by elogind
835 static int merge_env_file_push(
836 const char *filename, unsigned line,
837 const char *key, char *value,
841 char ***env = userdata;
842 char *expanded_value;
847 log_error("%s:%u: invalid syntax (around \"%s\"), ignoring.", strna(filename), line, key);
851 if (!env_name_is_valid(key)) {
852 log_error("%s:%u: invalid variable name \"%s\", ignoring.", strna(filename), line, key);
857 expanded_value = replace_env(value, *env,
858 REPLACE_ENV_USE_ENVIRONMENT|
859 REPLACE_ENV_ALLOW_BRACELESS|
860 REPLACE_ENV_ALLOW_EXTENDED);
864 free_and_replace(value, expanded_value);
866 return load_env_file_push(filename, line, key, value, env, n_pushed);
874 /* NOTE: this function supports braceful and braceless variable expansions,
875 * plus "extended" substitutions, unlike other exported parsing functions.
878 return parse_env_file_internal(f, fname, NEWLINE, merge_env_file_push, env, NULL);
881 static void write_env_var(FILE *f, const char *v) {
887 fputs_unlocked(v, f);
888 fputc_unlocked('\n', f);
893 fwrite_unlocked(v, 1, p-v, f);
895 if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE SHELL_NEED_QUOTES)) {
896 fputc_unlocked('\"', f);
899 if (strchr(SHELL_NEED_ESCAPE, *p))
900 fputc_unlocked('\\', f);
902 fputc_unlocked(*p, f);
905 fputc_unlocked('\"', f);
907 fputs_unlocked(p, f);
909 fputc_unlocked('\n', f);
912 int write_env_file(const char *fname, char **l) {
913 _cleanup_fclose_ FILE *f = NULL;
914 _cleanup_free_ char *p = NULL;
920 r = fopen_temporary(fname, &f, &p);
924 (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
925 (void) fchmod_umask(fileno(f), 0644);
928 write_env_var(f, *i);
930 r = fflush_and_check(f);
932 if (rename(p, fname) >= 0)
942 int executable_is_script(const char *path, char **interpreter) {
943 _cleanup_free_ char *line = NULL;
950 r = read_one_line_file(path, &line);
951 if (r == -ENOBUFS) /* First line overly long? if so, then it's not a script */
956 if (!startswith(line, "#!"))
959 ans = strstrip(line + 2);
960 len = strcspn(ans, " \t");
965 ans = strndup(ans, len);
975 * Retrieve one field from a file like /proc/self/status. pattern
976 * should not include whitespace or the delimiter (':'). pattern matches only
977 * the beginning of a line. Whitespace before ':' is skipped. Whitespace and
978 * zeros after the ':' will be skipped. field must be freed afterwards.
979 * terminator specifies the terminating characters of the field value (not
980 * included in the value).
982 int get_proc_field(const char *filename, const char *pattern, const char *terminator, char **field) {
983 _cleanup_free_ char *status = NULL;
993 r = read_full_file(filename, &status, NULL);
1003 t = strstr(t, pattern);
1007 /* Check that pattern occurs in beginning of line. */
1008 pattern_ok = (t == status || t[-1] == '\n');
1010 t += strlen(pattern);
1012 } while (!pattern_ok);
1014 t += strspn(t, " \t");
1018 } while (*t != ':');
1023 t += strspn(t, " \t");
1025 /* Also skip zeros, because when this is used for
1026 * capabilities, we don't want the zeros. This way the
1027 * same capability set always maps to the same string,
1028 * irrespective of the total capability set size. For
1029 * other numbers it shouldn't matter. */
1030 t += strspn(t, "0");
1031 /* Back off one char if there's nothing but whitespace
1033 if (!*t || isspace(*t))
1037 len = strcspn(t, terminator);
1039 f = strndup(t, len);
1047 DIR *xopendirat(int fd, const char *name, int flags) {
1051 assert(!(flags & O_CREAT));
1053 nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0);
1066 #if 0 /// UNNEEDED by elogind
1067 static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) {
1074 if (!path_strv_resolve_uniq(search, root))
1077 STRV_FOREACH(i, search) {
1078 _cleanup_free_ char *p = NULL;
1082 p = strjoin(root, *i, "/", path);
1084 p = strjoin(*i, "/", path);
1094 if (errno != ENOENT)
1101 int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) {
1102 _cleanup_strv_free_ char **copy = NULL;
1108 if (path_is_absolute(path)) {
1111 f = fopen(path, mode);
1120 copy = strv_copy((char**) search);
1124 return search_and_fopen_internal(path, mode, root, copy, _f);
1127 int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) {
1128 _cleanup_strv_free_ char **s = NULL;
1130 if (path_is_absolute(path)) {
1133 f = fopen(path, mode);
1142 s = strv_split_nulstr(search);
1146 return search_and_fopen_internal(path, mode, root, s, _f);
1150 int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
1159 r = tempfn_xxxxxx(path, NULL, &t);
1163 fd = mkostemp_safe(t);
1169 f = fdopen(fd, "we");
1183 int fflush_and_check(FILE *f) {
1190 return errno > 0 ? -errno : -EIO;
1195 int fflush_sync_and_check(FILE *f) {
1200 r = fflush_and_check(f);
1204 if (fsync(fileno(f)) < 0)
1207 r = fsync_directory_of_file(fileno(f));
1214 /* This is much like mkostemp() but is subject to umask(). */
1215 int mkostemp_safe(char *pattern) {
1216 _cleanup_umask_ mode_t u = 0;
1223 fd = mkostemp(pattern, O_CLOEXEC);
1230 int tempfn_xxxxxx(const char *p, const char *extra, char **ret) {
1242 * /foo/bar/.#<extra>waldoXXXXXX
1246 if (!filename_is_valid(fn))
1249 extra = strempty(extra);
1251 t = new(char, strlen(p) + 2 + strlen(extra) + 6 + 1);
1255 strcpy(stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn), "XXXXXX");
1257 *ret = path_simplify(t, false);
1261 int tempfn_random(const char *p, const char *extra, char **ret) {
1275 * /foo/bar/.#<extra>waldobaa2a261115984a9
1279 if (!filename_is_valid(fn))
1282 extra = strempty(extra);
1284 t = new(char, strlen(p) + 2 + strlen(extra) + 16 + 1);
1288 x = stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn);
1291 for (i = 0; i < 16; i++) {
1292 *(x++) = hexchar(u & 0xF);
1298 *ret = path_simplify(t, false);
1302 #if 0 /// UNNEEDED by elogind
1303 int tempfn_random_child(const char *p, const char *extra, char **ret) {
1314 * /foo/bar/waldo/.#<extra>3c2b6219aa75d7d0
1323 extra = strempty(extra);
1325 t = new(char, strlen(p) + 3 + strlen(extra) + 16 + 1);
1329 x = stpcpy(stpcpy(stpcpy(t, p), "/.#"), extra);
1332 for (i = 0; i < 16; i++) {
1333 *(x++) = hexchar(u & 0xF);
1339 *ret = path_simplify(t, false);
1343 int write_timestamp_file_atomic(const char *fn, usec_t n) {
1344 char ln[DECIMAL_STR_MAX(n)+2];
1346 /* Creates a "timestamp" file, that contains nothing but a
1347 * usec_t timestamp, formatted in ASCII. */
1349 if (n <= 0 || n >= USEC_INFINITY)
1352 xsprintf(ln, USEC_FMT "\n", n);
1354 return write_string_file(fn, ln, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
1357 int read_timestamp_file(const char *fn, usec_t *ret) {
1358 _cleanup_free_ char *ln = NULL;
1362 r = read_one_line_file(fn, &ln);
1366 r = safe_atou64(ln, &t);
1370 if (t <= 0 || t >= (uint64_t) USEC_INFINITY)
1377 int fputs_with_space(FILE *f, const char *s, const char *separator, bool *space) {
1382 /* Outputs the specified string with fputs(), but optionally prefixes it with a separator. The *space parameter
1383 * when specified shall initially point to a boolean variable initialized to false. It is set to true after the
1384 * first invocation. This call is supposed to be use in loops, where a separator shall be inserted between each
1385 * element, but not before the first one. */
1395 r = fputs(separator, f);
1407 int open_tmpfile_unlinkable(const char *directory, int flags) {
1412 r = tmp_dir(&directory);
1417 /* Returns an unlinked temporary file that cannot be linked into the file system anymore */
1419 /* Try O_TMPFILE first, if it is supported */
1420 fd = open(directory, flags|O_TMPFILE|O_EXCL, S_IRUSR|S_IWUSR);
1424 /* Fall back to unguessable name + unlinking */
1425 p = strjoina(directory, "/systemd-tmp-XXXXXX");
1427 fd = mkostemp_safe(p);
1436 #if 0 /// UNNEEDED by elogind
1437 int open_tmpfile_linkable(const char *target, int flags, char **ret_path) {
1438 _cleanup_free_ char *tmp = NULL;
1444 /* Don't allow O_EXCL, as that has a special meaning for O_TMPFILE */
1445 assert((flags & O_EXCL) == 0);
1447 /* Creates a temporary file, that shall be renamed to "target" later. If possible, this uses O_TMPFILE – in
1448 * which case "ret_path" will be returned as NULL. If not possible a the tempoary path name used is returned in
1449 * "ret_path". Use link_tmpfile() below to rename the result after writing the file in full. */
1452 _cleanup_free_ char *dn = NULL;
1454 dn = dirname_malloc(target);
1458 fd = open(dn, O_TMPFILE|flags, 0640);
1464 log_debug_errno(errno, "Failed to use O_TMPFILE on %s: %m", dn);
1467 r = tempfn_random(target, NULL, &tmp);
1471 fd = open(tmp, O_CREAT|O_EXCL|O_NOFOLLOW|O_NOCTTY|flags, 0640);
1475 *ret_path = TAKE_PTR(tmp);
1481 int open_serialization_fd(const char *ident) {
1484 fd = memfd_create(ident, MFD_CLOEXEC);
1488 path = getpid_cached() == 1 ? "/run/systemd" : "/tmp";
1489 fd = open_tmpfile_unlinkable(path, O_RDWR|O_CLOEXEC);
1493 log_debug("Serializing %s to %s.", ident, path);
1495 log_debug("Serializing %s to memfd.", ident);
1500 #if 0 /// UNNEEDED by elogind
1501 int link_tmpfile(int fd, const char *path, const char *target) {
1506 /* Moves a temporary file created with open_tmpfile() above into its final place. if "path" is NULL an fd
1507 * created with O_TMPFILE is assumed, and linkat() is used. Otherwise it is assumed O_TMPFILE is not supported
1508 * on the directory, and renameat2() is used instead.
1510 * Note that in both cases we will not replace existing files. This is because linkat() does not support this
1511 * operation currently (renameat2() does), and there is no nice way to emulate this. */
1514 if (rename_noreplace(AT_FDCWD, path, AT_FDCWD, target) < 0)
1517 char proc_fd_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(fd) + 1];
1519 xsprintf(proc_fd_path, "/proc/self/fd/%i", fd);
1521 if (linkat(AT_FDCWD, proc_fd_path, AT_FDCWD, target, AT_SYMLINK_FOLLOW) < 0)
1528 int read_nul_string(FILE *f, char **ret) {
1529 _cleanup_free_ char *x = NULL;
1530 size_t allocated = 0, n = 0;
1535 /* Reads a NUL-terminated string from the specified file. */
1540 if (!GREEDY_REALLOC(x, allocated, n+2))
1544 if (c == 0) /* Terminate at NUL byte */
1549 break; /* Terminate at EOF */
1568 int mkdtemp_malloc(const char *template, char **ret) {
1574 p = strdup(template);
1588 DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, funlockfile);
1590 int read_line(FILE *f, size_t limit, char **ret) {
1591 _cleanup_free_ char *buffer = NULL;
1592 size_t n = 0, allocated = 0, count = 0;
1596 /* Something like a bounded version of getline().
1598 * Considers EOF, \n and \0 end of line delimiters, and does not include these delimiters in the string
1601 * Returns the number of bytes read from the files (i.e. including delimiters — this hence usually differs from
1602 * the number of characters in the returned string). When EOF is hit, 0 is returned.
1604 * The input parameter limit is the maximum numbers of characters in the returned string, i.e. excluding
1605 * delimiters. If the limit is hit we fail and return -ENOBUFS.
1607 * If a line shall be skipped ret may be initialized as NULL. */
1610 if (!GREEDY_REALLOC(buffer, allocated, 1))
1615 _unused_ _cleanup_(funlockfilep) FILE *flocked = f;
1625 c = fgetc_unlocked(f);
1627 /* if we read an error, and have no data to return, then propagate the error */
1628 if (ferror_unlocked(f) && n == 0)
1629 return errno > 0 ? -errno : -EIO;
1636 if (IN_SET(c, '\n', 0)) /* Reached a delimiter */
1640 if (!GREEDY_REALLOC(buffer, allocated, n + 2))
1643 buffer[n] = (char) c;
1653 *ret = TAKE_PTR(buffer);