1615 lines
44 KiB
C
1615 lines
44 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
|
||
/***
|
||
This file is part of systemd.
|
||
|
||
Copyright 2010 Lennart Poettering
|
||
|
||
systemd is free software; you can redistribute it and/or modify it
|
||
under the terms of the GNU Lesser General Public License as published by
|
||
the Free Software Foundation; either version 2.1 of the License, or
|
||
(at your option) any later version.
|
||
|
||
systemd is distributed in the hope that it will be useful, but
|
||
WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
Lesser General Public License for more details.
|
||
|
||
You should have received a copy of the GNU Lesser General Public License
|
||
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
||
***/
|
||
|
||
#include <errno.h>
|
||
#include <fcntl.h>
|
||
#include <limits.h>
|
||
#include <stdarg.h>
|
||
#include <stdint.h>
|
||
#include <stdio_ext.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
#include <sys/mman.h>
|
||
#include <sys/stat.h>
|
||
#include <sys/types.h>
|
||
#include <unistd.h>
|
||
|
||
#include "alloc-util.h"
|
||
#include "ctype.h"
|
||
#include "def.h"
|
||
#include "env-util.h"
|
||
#include "escape.h"
|
||
#include "fd-util.h"
|
||
#include "fileio.h"
|
||
#include "fs-util.h"
|
||
#include "hexdecoct.h"
|
||
#include "log.h"
|
||
#include "macro.h"
|
||
#include "missing.h"
|
||
#include "parse-util.h"
|
||
#include "path-util.h"
|
||
#include "process-util.h"
|
||
#include "random-util.h"
|
||
#include "stdio-util.h"
|
||
#include "string-util.h"
|
||
#include "strv.h"
|
||
#include "time-util.h"
|
||
#include "umask-util.h"
|
||
#include "utf8.h"
|
||
|
||
#define READ_FULL_BYTES_MAX (4U*1024U*1024U)
|
||
|
||
int write_string_stream_ts(
|
||
FILE *f,
|
||
const char *line,
|
||
WriteStringFileFlags flags,
|
||
struct timespec *ts) {
|
||
|
||
bool needs_nl;
|
||
|
||
assert(f);
|
||
assert(line);
|
||
|
||
if (ferror(f))
|
||
return -EIO;
|
||
|
||
needs_nl = !(flags & WRITE_STRING_FILE_AVOID_NEWLINE) && !endswith(line, "\n");
|
||
|
||
if (needs_nl && (flags & WRITE_STRING_FILE_DISABLE_BUFFER)) {
|
||
/* If STDIO buffering was disabled, then let's append the newline character to the string itself, so
|
||
* that the write goes out in one go, instead of two */
|
||
|
||
line = strjoina(line, "\n");
|
||
needs_nl = false;
|
||
}
|
||
|
||
if (fputs(line, f) == EOF)
|
||
return -errno;
|
||
|
||
if (needs_nl)
|
||
if (fputc('\n', f) == EOF)
|
||
return -errno;
|
||
|
||
if (ts) {
|
||
struct timespec twice[2] = {*ts, *ts};
|
||
|
||
if (futimens(fileno(f), twice) < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (flags & WRITE_STRING_FILE_SYNC)
|
||
return fflush_sync_and_check(f);
|
||
else
|
||
return fflush_and_check(f);
|
||
}
|
||
|
||
static int write_string_file_atomic(
|
||
const char *fn,
|
||
const char *line,
|
||
WriteStringFileFlags flags,
|
||
struct timespec *ts) {
|
||
|
||
_cleanup_fclose_ FILE *f = NULL;
|
||
_cleanup_free_ char *p = NULL;
|
||
int r;
|
||
|
||
assert(fn);
|
||
assert(line);
|
||
|
||
r = fopen_temporary(fn, &f, &p);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
|
||
(void) fchmod_umask(fileno(f), 0644);
|
||
|
||
r = write_string_stream_ts(f, line, flags, ts);
|
||
if (r < 0)
|
||
goto fail;
|
||
|
||
if (rename(p, fn) < 0) {
|
||
r = -errno;
|
||
goto fail;
|
||
}
|
||
|
||
return 0;
|
||
|
||
fail:
|
||
(void) unlink(p);
|
||
return r;
|
||
}
|
||
|
||
int write_string_file_ts(
|
||
const char *fn,
|
||
const char *line,
|
||
WriteStringFileFlags flags,
|
||
struct timespec *ts) {
|
||
|
||
_cleanup_fclose_ FILE *f = NULL;
|
||
int q, r;
|
||
|
||
assert(fn);
|
||
assert(line);
|
||
|
||
/* We don't know how to verify whether the file contents was already on-disk. */
|
||
assert(!((flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE) && (flags & WRITE_STRING_FILE_SYNC)));
|
||
|
||
if (flags & WRITE_STRING_FILE_ATOMIC) {
|
||
assert(flags & WRITE_STRING_FILE_CREATE);
|
||
|
||
r = write_string_file_atomic(fn, line, flags, ts);
|
||
if (r < 0)
|
||
goto fail;
|
||
|
||
return r;
|
||
} else
|
||
assert(!ts);
|
||
|
||
if (flags & WRITE_STRING_FILE_CREATE) {
|
||
f = fopen(fn, "we");
|
||
if (!f) {
|
||
r = -errno;
|
||
goto fail;
|
||
}
|
||
} else {
|
||
int fd;
|
||
|
||
/* We manually build our own version of fopen(..., "we") that
|
||
* works without O_CREAT */
|
||
fd = open(fn, O_WRONLY|O_CLOEXEC|O_NOCTTY);
|
||
if (fd < 0) {
|
||
r = -errno;
|
||
goto fail;
|
||
}
|
||
|
||
f = fdopen(fd, "we");
|
||
if (!f) {
|
||
r = -errno;
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||
safe_close(fd);
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||
goto fail;
|
||
}
|
||
}
|
||
|
||
(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
|
||
|
||
if (flags & WRITE_STRING_FILE_DISABLE_BUFFER)
|
||
setvbuf(f, NULL, _IONBF, 0);
|
||
|
||
r = write_string_stream_ts(f, line, flags, ts);
|
||
if (r < 0)
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||
goto fail;
|
||
|
||
return 0;
|
||
|
||
fail:
|
||
if (!(flags & WRITE_STRING_FILE_VERIFY_ON_FAILURE))
|
||
return r;
|
||
|
||
f = safe_fclose(f);
|
||
|
||
/* OK, the operation failed, but let's see if the right
|
||
* contents in place already. If so, eat up the error. */
|
||
|
||
q = verify_file(fn, line, !(flags & WRITE_STRING_FILE_AVOID_NEWLINE));
|
||
if (q <= 0)
|
||
return r;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int read_one_line_file(const char *fn, char **line) {
|
||
_cleanup_fclose_ FILE *f = NULL;
|
||
int r;
|
||
|
||
assert(fn);
|
||
assert(line);
|
||
|
||
f = fopen(fn, "re");
|
||
if (!f)
|
||
return -errno;
|
||
|
||
(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
|
||
|
||
r = read_line(f, LONG_LINE_MAX, line);
|
||
return r < 0 ? r : 0;
|
||
}
|
||
|
||
int verify_file(const char *fn, const char *blob, bool accept_extra_nl) {
|
||
_cleanup_fclose_ FILE *f = NULL;
|
||
_cleanup_free_ char *buf = NULL;
|
||
size_t l, k;
|
||
|
||
assert(fn);
|
||
assert(blob);
|
||
|
||
l = strlen(blob);
|
||
|
||
if (accept_extra_nl && endswith(blob, "\n"))
|
||
accept_extra_nl = false;
|
||
|
||
buf = malloc(l + accept_extra_nl + 1);
|
||
if (!buf)
|
||
return -ENOMEM;
|
||
|
||
f = fopen(fn, "re");
|
||
if (!f)
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||
return -errno;
|
||
|
||
(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
|
||
|
||
/* We try to read one byte more than we need, so that we know whether we hit eof */
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||
errno = 0;
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||
k = fread(buf, 1, l + accept_extra_nl + 1, f);
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||
if (ferror(f))
|
||
return errno > 0 ? -errno : -EIO;
|
||
|
||
if (k != l && k != l + accept_extra_nl)
|
||
return 0;
|
||
if (memcmp(buf, blob, l) != 0)
|
||
return 0;
|
||
if (k > l && buf[l] != '\n')
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
int read_full_stream(FILE *f, char **contents, size_t *size) {
|
||
size_t n, l;
|
||
_cleanup_free_ char *buf = NULL;
|
||
struct stat st;
|
||
|
||
assert(f);
|
||
assert(contents);
|
||
|
||
if (fstat(fileno(f), &st) < 0)
|
||
return -errno;
|
||
|
||
n = LINE_MAX;
|
||
|
||
if (S_ISREG(st.st_mode)) {
|
||
|
||
/* Safety check */
|
||
if (st.st_size > READ_FULL_BYTES_MAX)
|
||
return -E2BIG;
|
||
|
||
/* Start with the right file size, but be prepared for files from /proc which generally report a file
|
||
* size of 0. Note that we increase the size to read here by one, so that the first read attempt
|
||
* already makes us notice the EOF. */
|
||
if (st.st_size > 0)
|
||
n = st.st_size + 1;
|
||
}
|
||
|
||
l = 0;
|
||
for (;;) {
|
||
char *t;
|
||
size_t k;
|
||
|
||
t = realloc(buf, n + 1);
|
||
if (!t)
|
||
return -ENOMEM;
|
||
|
||
buf = t;
|
||
errno = 0;
|
||
k = fread(buf + l, 1, n - l, f);
|
||
if (k > 0)
|
||
l += k;
|
||
|
||
if (ferror(f))
|
||
return errno > 0 ? -errno : -EIO;
|
||
|
||
if (feof(f))
|
||
break;
|
||
|
||
/* We aren't expecting fread() to return a short read outside
|
||
* of (error && eof), assert buffer is full and enlarge buffer.
|
||
*/
|
||
assert(l == n);
|
||
|
||
/* Safety check */
|
||
if (n >= READ_FULL_BYTES_MAX)
|
||
return -E2BIG;
|
||
|
||
n = MIN(n * 2, READ_FULL_BYTES_MAX);
|
||
}
|
||
|
||
buf[l] = 0;
|
||
*contents = TAKE_PTR(buf);
|
||
|
||
if (size)
|
||
*size = l;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int read_full_file(const char *fn, char **contents, size_t *size) {
|
||
_cleanup_fclose_ FILE *f = NULL;
|
||
|
||
assert(fn);
|
||
assert(contents);
|
||
|
||
f = fopen(fn, "re");
|
||
if (!f)
|
||
return -errno;
|
||
|
||
(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
|
||
|
||
return read_full_stream(f, contents, size);
|
||
}
|
||
|
||
static int parse_env_file_internal(
|
||
FILE *f,
|
||
const char *fname,
|
||
const char *newline,
|
||
int (*push) (const char *filename, unsigned line,
|
||
const char *key, char *value, void *userdata, int *n_pushed),
|
||
void *userdata,
|
||
int *n_pushed) {
|
||
|
||
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;
|
||
_cleanup_free_ char *contents = NULL, *key = NULL, *value = NULL;
|
||
unsigned line = 1;
|
||
char *p;
|
||
int r;
|
||
|
||
enum {
|
||
PRE_KEY,
|
||
KEY,
|
||
PRE_VALUE,
|
||
VALUE,
|
||
VALUE_ESCAPE,
|
||
SINGLE_QUOTE_VALUE,
|
||
SINGLE_QUOTE_VALUE_ESCAPE,
|
||
DOUBLE_QUOTE_VALUE,
|
||
DOUBLE_QUOTE_VALUE_ESCAPE,
|
||
COMMENT,
|
||
COMMENT_ESCAPE
|
||
} state = PRE_KEY;
|
||
|
||
assert(newline);
|
||
|
||
if (f)
|
||
r = read_full_stream(f, &contents, NULL);
|
||
else
|
||
r = read_full_file(fname, &contents, NULL);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
for (p = contents; *p; p++) {
|
||
char c = *p;
|
||
|
||
switch (state) {
|
||
|
||
case PRE_KEY:
|
||
if (strchr(COMMENTS, c))
|
||
state = COMMENT;
|
||
else if (!strchr(WHITESPACE, c)) {
|
||
state = KEY;
|
||
last_key_whitespace = (size_t) -1;
|
||
|
||
if (!GREEDY_REALLOC(key, key_alloc, n_key+2))
|
||
return -ENOMEM;
|
||
|
||
key[n_key++] = c;
|
||
}
|
||
break;
|
||
|
||
case KEY:
|
||
if (strchr(newline, c)) {
|
||
state = PRE_KEY;
|
||
line++;
|
||
n_key = 0;
|
||
} else if (c == '=') {
|
||
state = PRE_VALUE;
|
||
last_value_whitespace = (size_t) -1;
|
||
} else {
|
||
if (!strchr(WHITESPACE, c))
|
||
last_key_whitespace = (size_t) -1;
|
||
else if (last_key_whitespace == (size_t) -1)
|
||
last_key_whitespace = n_key;
|
||
|
||
if (!GREEDY_REALLOC(key, key_alloc, n_key+2))
|
||
return -ENOMEM;
|
||
|
||
key[n_key++] = c;
|
||
}
|
||
|
||
break;
|
||
|
||
case PRE_VALUE:
|
||
if (strchr(newline, c)) {
|
||
state = PRE_KEY;
|
||
line++;
|
||
key[n_key] = 0;
|
||
|
||
if (value)
|
||
value[n_value] = 0;
|
||
|
||
/* strip trailing whitespace from key */
|
||
if (last_key_whitespace != (size_t) -1)
|
||
key[last_key_whitespace] = 0;
|
||
|
||
r = push(fname, line, key, value, userdata, n_pushed);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
n_key = 0;
|
||
value = NULL;
|
||
value_alloc = n_value = 0;
|
||
|
||
} else if (c == '\'')
|
||
state = SINGLE_QUOTE_VALUE;
|
||
else if (c == '\"')
|
||
state = DOUBLE_QUOTE_VALUE;
|
||
else if (c == '\\')
|
||
state = VALUE_ESCAPE;
|
||
else if (!strchr(WHITESPACE, c)) {
|
||
state = VALUE;
|
||
|
||
if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
|
||
return -ENOMEM;
|
||
|
||
value[n_value++] = c;
|
||
}
|
||
|
||
break;
|
||
|
||
case VALUE:
|
||
if (strchr(newline, c)) {
|
||
state = PRE_KEY;
|
||
line++;
|
||
|
||
key[n_key] = 0;
|
||
|
||
if (value)
|
||
value[n_value] = 0;
|
||
|
||
/* Chomp off trailing whitespace from value */
|
||
if (last_value_whitespace != (size_t) -1)
|
||
value[last_value_whitespace] = 0;
|
||
|
||
/* strip trailing whitespace from key */
|
||
if (last_key_whitespace != (size_t) -1)
|
||
key[last_key_whitespace] = 0;
|
||
|
||
r = push(fname, line, key, value, userdata, n_pushed);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
n_key = 0;
|
||
value = NULL;
|
||
value_alloc = n_value = 0;
|
||
|
||
} else if (c == '\\') {
|
||
state = VALUE_ESCAPE;
|
||
last_value_whitespace = (size_t) -1;
|
||
} else {
|
||
if (!strchr(WHITESPACE, c))
|
||
last_value_whitespace = (size_t) -1;
|
||
else if (last_value_whitespace == (size_t) -1)
|
||
last_value_whitespace = n_value;
|
||
|
||
if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
|
||
return -ENOMEM;
|
||
|
||
value[n_value++] = c;
|
||
}
|
||
|
||
break;
|
||
|
||
case VALUE_ESCAPE:
|
||
state = VALUE;
|
||
|
||
if (!strchr(newline, c)) {
|
||
/* Escaped newlines we eat up entirely */
|
||
if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
|
||
return -ENOMEM;
|
||
|
||
value[n_value++] = c;
|
||
}
|
||
break;
|
||
|
||
case SINGLE_QUOTE_VALUE:
|
||
if (c == '\'')
|
||
state = PRE_VALUE;
|
||
else if (c == '\\')
|
||
state = SINGLE_QUOTE_VALUE_ESCAPE;
|
||
else {
|
||
if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
|
||
return -ENOMEM;
|
||
|
||
value[n_value++] = c;
|
||
}
|
||
|
||
break;
|
||
|
||
case SINGLE_QUOTE_VALUE_ESCAPE:
|
||
state = SINGLE_QUOTE_VALUE;
|
||
|
||
if (!strchr(newline, c)) {
|
||
if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
|
||
return -ENOMEM;
|
||
|
||
value[n_value++] = c;
|
||
}
|
||
break;
|
||
|
||
case DOUBLE_QUOTE_VALUE:
|
||
if (c == '\"')
|
||
state = PRE_VALUE;
|
||
else if (c == '\\')
|
||
state = DOUBLE_QUOTE_VALUE_ESCAPE;
|
||
else {
|
||
if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
|
||
return -ENOMEM;
|
||
|
||
value[n_value++] = c;
|
||
}
|
||
|
||
break;
|
||
|
||
case DOUBLE_QUOTE_VALUE_ESCAPE:
|
||
state = DOUBLE_QUOTE_VALUE;
|
||
|
||
if (!strchr(newline, c)) {
|
||
if (!GREEDY_REALLOC(value, value_alloc, n_value+2))
|
||
return -ENOMEM;
|
||
|
||
value[n_value++] = c;
|
||
}
|
||
break;
|
||
|
||
case COMMENT:
|
||
if (c == '\\')
|
||
state = COMMENT_ESCAPE;
|
||
else if (strchr(newline, c)) {
|
||
state = PRE_KEY;
|
||
line++;
|
||
}
|
||
break;
|
||
|
||
case COMMENT_ESCAPE:
|
||
state = COMMENT;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (IN_SET(state,
|
||
PRE_VALUE,
|
||
VALUE,
|
||
VALUE_ESCAPE,
|
||
SINGLE_QUOTE_VALUE,
|
||
SINGLE_QUOTE_VALUE_ESCAPE,
|
||
DOUBLE_QUOTE_VALUE,
|
||
DOUBLE_QUOTE_VALUE_ESCAPE)) {
|
||
|
||
key[n_key] = 0;
|
||
|
||
if (value)
|
||
value[n_value] = 0;
|
||
|
||
if (state == VALUE)
|
||
if (last_value_whitespace != (size_t) -1)
|
||
value[last_value_whitespace] = 0;
|
||
|
||
/* strip trailing whitespace from key */
|
||
if (last_key_whitespace != (size_t) -1)
|
||
key[last_key_whitespace] = 0;
|
||
|
||
r = push(fname, line, key, value, userdata, n_pushed);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
value = NULL;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int check_utf8ness_and_warn(
|
||
const char *filename, unsigned line,
|
||
const char *key, char *value) {
|
||
|
||
if (!utf8_is_valid(key)) {
|
||
_cleanup_free_ char *p = NULL;
|
||
|
||
p = utf8_escape_invalid(key);
|
||
log_error("%s:%u: invalid UTF-8 in key '%s', ignoring.", strna(filename), line, p);
|
||
return -EINVAL;
|
||
}
|
||
|
||
if (value && !utf8_is_valid(value)) {
|
||
_cleanup_free_ char *p = NULL;
|
||
|
||
p = utf8_escape_invalid(value);
|
||
log_error("%s:%u: invalid UTF-8 value for key %s: '%s', ignoring.", strna(filename), line, key, p);
|
||
return -EINVAL;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int parse_env_file_push(
|
||
const char *filename, unsigned line,
|
||
const char *key, char *value,
|
||
void *userdata,
|
||
int *n_pushed) {
|
||
|
||
const char *k;
|
||
va_list aq, *ap = userdata;
|
||
int r;
|
||
|
||
r = check_utf8ness_and_warn(filename, line, key, value);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
va_copy(aq, *ap);
|
||
|
||
while ((k = va_arg(aq, const char *))) {
|
||
char **v;
|
||
|
||
v = va_arg(aq, char **);
|
||
|
||
if (streq(key, k)) {
|
||
va_end(aq);
|
||
free(*v);
|
||
*v = value;
|
||
|
||
if (n_pushed)
|
||
(*n_pushed)++;
|
||
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
va_end(aq);
|
||
free(value);
|
||
|
||
return 0;
|
||
}
|
||
|
||
int parse_env_file(
|
||
const char *fname,
|
||
const char *newline, ...) {
|
||
|
||
va_list ap;
|
||
int r, n_pushed = 0;
|
||
|
||
if (!newline)
|
||
newline = NEWLINE;
|
||
|
||
va_start(ap, newline);
|
||
r = parse_env_file_internal(NULL, fname, newline, parse_env_file_push, &ap, &n_pushed);
|
||
va_end(ap);
|
||
|
||
return r < 0 ? r : n_pushed;
|
||
}
|
||
|
||
static int load_env_file_push(
|
||
const char *filename, unsigned line,
|
||
const char *key, char *value,
|
||
void *userdata,
|
||
int *n_pushed) {
|
||
char ***m = userdata;
|
||
char *p;
|
||
int r;
|
||
|
||
r = check_utf8ness_and_warn(filename, line, key, value);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
p = strjoin(key, "=", value);
|
||
if (!p)
|
||
return -ENOMEM;
|
||
|
||
r = strv_env_replace(m, p);
|
||
if (r < 0) {
|
||
free(p);
|
||
return r;
|
||
}
|
||
|
||
if (n_pushed)
|
||
(*n_pushed)++;
|
||
|
||
free(value);
|
||
return 0;
|
||
}
|
||
|
||
int load_env_file(FILE *f, const char *fname, const char *newline, char ***rl) {
|
||
char **m = NULL;
|
||
int r;
|
||
|
||
if (!newline)
|
||
newline = NEWLINE;
|
||
|
||
r = parse_env_file_internal(f, fname, newline, load_env_file_push, &m, NULL);
|
||
if (r < 0) {
|
||
strv_free(m);
|
||
return r;
|
||
}
|
||
|
||
*rl = m;
|
||
return 0;
|
||
}
|
||
|
||
static int load_env_file_push_pairs(
|
||
const char *filename, unsigned line,
|
||
const char *key, char *value,
|
||
void *userdata,
|
||
int *n_pushed) {
|
||
char ***m = userdata;
|
||
int r;
|
||
|
||
r = check_utf8ness_and_warn(filename, line, key, value);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
r = strv_extend(m, key);
|
||
if (r < 0)
|
||
return -ENOMEM;
|
||
|
||
if (!value) {
|
||
r = strv_extend(m, "");
|
||
if (r < 0)
|
||
return -ENOMEM;
|
||
} else {
|
||
r = strv_push(m, value);
|
||
if (r < 0)
|
||
return r;
|
||
}
|
||
|
||
if (n_pushed)
|
||
(*n_pushed)++;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int load_env_file_pairs(FILE *f, const char *fname, const char *newline, char ***rl) {
|
||
char **m = NULL;
|
||
int r;
|
||
|
||
if (!newline)
|
||
newline = NEWLINE;
|
||
|
||
r = parse_env_file_internal(f, fname, newline, load_env_file_push_pairs, &m, NULL);
|
||
if (r < 0) {
|
||
strv_free(m);
|
||
return r;
|
||
}
|
||
|
||
*rl = m;
|
||
return 0;
|
||
}
|
||
|
||
static int merge_env_file_push(
|
||
const char *filename, unsigned line,
|
||
const char *key, char *value,
|
||
void *userdata,
|
||
int *n_pushed) {
|
||
|
||
char ***env = userdata;
|
||
char *expanded_value;
|
||
|
||
assert(env);
|
||
|
||
if (!value) {
|
||
log_error("%s:%u: invalid syntax (around \"%s\"), ignoring.", strna(filename), line, key);
|
||
return 0;
|
||
}
|
||
|
||
if (!env_name_is_valid(key)) {
|
||
log_error("%s:%u: invalid variable name \"%s\", ignoring.", strna(filename), line, key);
|
||
free(value);
|
||
return 0;
|
||
}
|
||
|
||
expanded_value = replace_env(value, *env,
|
||
REPLACE_ENV_USE_ENVIRONMENT|
|
||
REPLACE_ENV_ALLOW_BRACELESS|
|
||
REPLACE_ENV_ALLOW_EXTENDED);
|
||
if (!expanded_value)
|
||
return -ENOMEM;
|
||
|
||
free_and_replace(value, expanded_value);
|
||
|
||
return load_env_file_push(filename, line, key, value, env, n_pushed);
|
||
}
|
||
|
||
int merge_env_file(
|
||
char ***env,
|
||
FILE *f,
|
||
const char *fname) {
|
||
|
||
/* NOTE: this function supports braceful and braceless variable expansions,
|
||
* plus "extended" substitutions, unlike other exported parsing functions.
|
||
*/
|
||
|
||
return parse_env_file_internal(f, fname, NEWLINE, merge_env_file_push, env, NULL);
|
||
}
|
||
|
||
static void write_env_var(FILE *f, const char *v) {
|
||
const char *p;
|
||
|
||
p = strchr(v, '=');
|
||
if (!p) {
|
||
/* Fallback */
|
||
fputs_unlocked(v, f);
|
||
fputc_unlocked('\n', f);
|
||
return;
|
||
}
|
||
|
||
p++;
|
||
fwrite_unlocked(v, 1, p-v, f);
|
||
|
||
if (string_has_cc(p, NULL) || chars_intersect(p, WHITESPACE SHELL_NEED_QUOTES)) {
|
||
fputc_unlocked('\"', f);
|
||
|
||
for (; *p; p++) {
|
||
if (strchr(SHELL_NEED_ESCAPE, *p))
|
||
fputc_unlocked('\\', f);
|
||
|
||
fputc_unlocked(*p, f);
|
||
}
|
||
|
||
fputc_unlocked('\"', f);
|
||
} else
|
||
fputs_unlocked(p, f);
|
||
|
||
fputc_unlocked('\n', f);
|
||
}
|
||
|
||
int write_env_file(const char *fname, char **l) {
|
||
_cleanup_fclose_ FILE *f = NULL;
|
||
_cleanup_free_ char *p = NULL;
|
||
char **i;
|
||
int r;
|
||
|
||
assert(fname);
|
||
|
||
r = fopen_temporary(fname, &f, &p);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
|
||
(void) fchmod_umask(fileno(f), 0644);
|
||
|
||
STRV_FOREACH(i, l)
|
||
write_env_var(f, *i);
|
||
|
||
r = fflush_and_check(f);
|
||
if (r >= 0) {
|
||
if (rename(p, fname) >= 0)
|
||
return 0;
|
||
|
||
r = -errno;
|
||
}
|
||
|
||
unlink(p);
|
||
return r;
|
||
}
|
||
|
||
int executable_is_script(const char *path, char **interpreter) {
|
||
_cleanup_free_ char *line = NULL;
|
||
size_t len;
|
||
char *ans;
|
||
int r;
|
||
|
||
assert(path);
|
||
|
||
r = read_one_line_file(path, &line);
|
||
if (r == -ENOBUFS) /* First line overly long? if so, then it's not a script */
|
||
return 0;
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (!startswith(line, "#!"))
|
||
return 0;
|
||
|
||
ans = strstrip(line + 2);
|
||
len = strcspn(ans, " \t");
|
||
|
||
if (len == 0)
|
||
return 0;
|
||
|
||
ans = strndup(ans, len);
|
||
if (!ans)
|
||
return -ENOMEM;
|
||
|
||
*interpreter = ans;
|
||
return 1;
|
||
}
|
||
|
||
/**
|
||
* Retrieve one field from a file like /proc/self/status. pattern
|
||
* should not include whitespace or the delimiter (':'). pattern matches only
|
||
* the beginning of a line. Whitespace before ':' is skipped. Whitespace and
|
||
* zeros after the ':' will be skipped. field must be freed afterwards.
|
||
* terminator specifies the terminating characters of the field value (not
|
||
* included in the value).
|
||
*/
|
||
int get_proc_field(const char *filename, const char *pattern, const char *terminator, char **field) {
|
||
_cleanup_free_ char *status = NULL;
|
||
char *t, *f;
|
||
size_t len;
|
||
int r;
|
||
|
||
assert(terminator);
|
||
assert(filename);
|
||
assert(pattern);
|
||
assert(field);
|
||
|
||
r = read_full_file(filename, &status, NULL);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
t = status;
|
||
|
||
do {
|
||
bool pattern_ok;
|
||
|
||
do {
|
||
t = strstr(t, pattern);
|
||
if (!t)
|
||
return -ENOENT;
|
||
|
||
/* Check that pattern occurs in beginning of line. */
|
||
pattern_ok = (t == status || t[-1] == '\n');
|
||
|
||
t += strlen(pattern);
|
||
|
||
} while (!pattern_ok);
|
||
|
||
t += strspn(t, " \t");
|
||
if (!*t)
|
||
return -ENOENT;
|
||
|
||
} while (*t != ':');
|
||
|
||
t++;
|
||
|
||
if (*t) {
|
||
t += strspn(t, " \t");
|
||
|
||
/* Also skip zeros, because when this is used for
|
||
* capabilities, we don't want the zeros. This way the
|
||
* same capability set always maps to the same string,
|
||
* irrespective of the total capability set size. For
|
||
* other numbers it shouldn't matter. */
|
||
t += strspn(t, "0");
|
||
/* Back off one char if there's nothing but whitespace
|
||
and zeros */
|
||
if (!*t || isspace(*t))
|
||
t--;
|
||
}
|
||
|
||
len = strcspn(t, terminator);
|
||
|
||
f = strndup(t, len);
|
||
if (!f)
|
||
return -ENOMEM;
|
||
|
||
*field = f;
|
||
return 0;
|
||
}
|
||
|
||
DIR *xopendirat(int fd, const char *name, int flags) {
|
||
int nfd;
|
||
DIR *d;
|
||
|
||
assert(!(flags & O_CREAT));
|
||
|
||
nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0);
|
||
if (nfd < 0)
|
||
return NULL;
|
||
|
||
d = fdopendir(nfd);
|
||
if (!d) {
|
||
safe_close(nfd);
|
||
return NULL;
|
||
}
|
||
|
||
return d;
|
||
}
|
||
|
||
static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) {
|
||
char **i;
|
||
|
||
assert(path);
|
||
assert(mode);
|
||
assert(_f);
|
||
|
||
if (!path_strv_resolve_uniq(search, root))
|
||
return -ENOMEM;
|
||
|
||
STRV_FOREACH(i, search) {
|
||
_cleanup_free_ char *p = NULL;
|
||
FILE *f;
|
||
|
||
if (root)
|
||
p = strjoin(root, *i, "/", path);
|
||
else
|
||
p = strjoin(*i, "/", path);
|
||
if (!p)
|
||
return -ENOMEM;
|
||
|
||
f = fopen(p, mode);
|
||
if (f) {
|
||
*_f = f;
|
||
return 0;
|
||
}
|
||
|
||
if (errno != ENOENT)
|
||
return -errno;
|
||
}
|
||
|
||
return -ENOENT;
|
||
}
|
||
|
||
int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) {
|
||
_cleanup_strv_free_ char **copy = NULL;
|
||
|
||
assert(path);
|
||
assert(mode);
|
||
assert(_f);
|
||
|
||
if (path_is_absolute(path)) {
|
||
FILE *f;
|
||
|
||
f = fopen(path, mode);
|
||
if (f) {
|
||
*_f = f;
|
||
return 0;
|
||
}
|
||
|
||
return -errno;
|
||
}
|
||
|
||
copy = strv_copy((char**) search);
|
||
if (!copy)
|
||
return -ENOMEM;
|
||
|
||
return search_and_fopen_internal(path, mode, root, copy, _f);
|
||
}
|
||
|
||
int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) {
|
||
_cleanup_strv_free_ char **s = NULL;
|
||
|
||
if (path_is_absolute(path)) {
|
||
FILE *f;
|
||
|
||
f = fopen(path, mode);
|
||
if (f) {
|
||
*_f = f;
|
||
return 0;
|
||
}
|
||
|
||
return -errno;
|
||
}
|
||
|
||
s = strv_split_nulstr(search);
|
||
if (!s)
|
||
return -ENOMEM;
|
||
|
||
return search_and_fopen_internal(path, mode, root, s, _f);
|
||
}
|
||
|
||
int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
|
||
FILE *f;
|
||
char *t;
|
||
int r, fd;
|
||
|
||
assert(path);
|
||
assert(_f);
|
||
assert(_temp_path);
|
||
|
||
r = tempfn_xxxxxx(path, NULL, &t);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
fd = mkostemp_safe(t);
|
||
if (fd < 0) {
|
||
free(t);
|
||
return -errno;
|
||
}
|
||
|
||
f = fdopen(fd, "we");
|
||
if (!f) {
|
||
unlink_noerrno(t);
|
||
free(t);
|
||
safe_close(fd);
|
||
return -errno;
|
||
}
|
||
|
||
*_f = f;
|
||
*_temp_path = t;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int fflush_and_check(FILE *f) {
|
||
assert(f);
|
||
|
||
errno = 0;
|
||
fflush(f);
|
||
|
||
if (ferror(f))
|
||
return errno > 0 ? -errno : -EIO;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int fflush_sync_and_check(FILE *f) {
|
||
int r;
|
||
|
||
assert(f);
|
||
|
||
r = fflush_and_check(f);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (fsync(fileno(f)) < 0)
|
||
return -errno;
|
||
|
||
r = fsync_directory_of_file(fileno(f));
|
||
if (r < 0)
|
||
return r;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* This is much like mkostemp() but is subject to umask(). */
|
||
int mkostemp_safe(char *pattern) {
|
||
_cleanup_umask_ mode_t u = 0;
|
||
int fd;
|
||
|
||
assert(pattern);
|
||
|
||
u = umask(077);
|
||
|
||
fd = mkostemp(pattern, O_CLOEXEC);
|
||
if (fd < 0)
|
||
return -errno;
|
||
|
||
return fd;
|
||
}
|
||
|
||
int tempfn_xxxxxx(const char *p, const char *extra, char **ret) {
|
||
const char *fn;
|
||
char *t;
|
||
|
||
assert(p);
|
||
assert(ret);
|
||
|
||
/*
|
||
* Turns this:
|
||
* /foo/bar/waldo
|
||
*
|
||
* Into this:
|
||
* /foo/bar/.#<extra>waldoXXXXXX
|
||
*/
|
||
|
||
fn = basename(p);
|
||
if (!filename_is_valid(fn))
|
||
return -EINVAL;
|
||
|
||
extra = strempty(extra);
|
||
|
||
t = new(char, strlen(p) + 2 + strlen(extra) + 6 + 1);
|
||
if (!t)
|
||
return -ENOMEM;
|
||
|
||
strcpy(stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn), "XXXXXX");
|
||
|
||
*ret = path_kill_slashes(t);
|
||
return 0;
|
||
}
|
||
|
||
int tempfn_random(const char *p, const char *extra, char **ret) {
|
||
const char *fn;
|
||
char *t, *x;
|
||
uint64_t u;
|
||
unsigned i;
|
||
|
||
assert(p);
|
||
assert(ret);
|
||
|
||
/*
|
||
* Turns this:
|
||
* /foo/bar/waldo
|
||
*
|
||
* Into this:
|
||
* /foo/bar/.#<extra>waldobaa2a261115984a9
|
||
*/
|
||
|
||
fn = basename(p);
|
||
if (!filename_is_valid(fn))
|
||
return -EINVAL;
|
||
|
||
extra = strempty(extra);
|
||
|
||
t = new(char, strlen(p) + 2 + strlen(extra) + 16 + 1);
|
||
if (!t)
|
||
return -ENOMEM;
|
||
|
||
x = stpcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), extra), fn);
|
||
|
||
u = random_u64();
|
||
for (i = 0; i < 16; i++) {
|
||
*(x++) = hexchar(u & 0xF);
|
||
u >>= 4;
|
||
}
|
||
|
||
*x = 0;
|
||
|
||
*ret = path_kill_slashes(t);
|
||
return 0;
|
||
}
|
||
|
||
int tempfn_random_child(const char *p, const char *extra, char **ret) {
|
||
char *t, *x;
|
||
uint64_t u;
|
||
unsigned i;
|
||
int r;
|
||
|
||
assert(ret);
|
||
|
||
/* Turns this:
|
||
* /foo/bar/waldo
|
||
* Into this:
|
||
* /foo/bar/waldo/.#<extra>3c2b6219aa75d7d0
|
||
*/
|
||
|
||
if (!p) {
|
||
r = tmp_dir(&p);
|
||
if (r < 0)
|
||
return r;
|
||
}
|
||
|
||
extra = strempty(extra);
|
||
|
||
t = new(char, strlen(p) + 3 + strlen(extra) + 16 + 1);
|
||
if (!t)
|
||
return -ENOMEM;
|
||
|
||
x = stpcpy(stpcpy(stpcpy(t, p), "/.#"), extra);
|
||
|
||
u = random_u64();
|
||
for (i = 0; i < 16; i++) {
|
||
*(x++) = hexchar(u & 0xF);
|
||
u >>= 4;
|
||
}
|
||
|
||
*x = 0;
|
||
|
||
*ret = path_kill_slashes(t);
|
||
return 0;
|
||
}
|
||
|
||
int write_timestamp_file_atomic(const char *fn, usec_t n) {
|
||
char ln[DECIMAL_STR_MAX(n)+2];
|
||
|
||
/* Creates a "timestamp" file, that contains nothing but a
|
||
* usec_t timestamp, formatted in ASCII. */
|
||
|
||
if (n <= 0 || n >= USEC_INFINITY)
|
||
return -ERANGE;
|
||
|
||
xsprintf(ln, USEC_FMT "\n", n);
|
||
|
||
return write_string_file(fn, ln, WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_ATOMIC);
|
||
}
|
||
|
||
int read_timestamp_file(const char *fn, usec_t *ret) {
|
||
_cleanup_free_ char *ln = NULL;
|
||
uint64_t t;
|
||
int r;
|
||
|
||
r = read_one_line_file(fn, &ln);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
r = safe_atou64(ln, &t);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (t <= 0 || t >= (uint64_t) USEC_INFINITY)
|
||
return -ERANGE;
|
||
|
||
*ret = (usec_t) t;
|
||
return 0;
|
||
}
|
||
|
||
int fputs_with_space(FILE *f, const char *s, const char *separator, bool *space) {
|
||
int r;
|
||
|
||
assert(s);
|
||
|
||
/* Outputs the specified string with fputs(), but optionally prefixes it with a separator. The *space parameter
|
||
* when specified shall initially point to a boolean variable initialized to false. It is set to true after the
|
||
* first invocation. This call is supposed to be use in loops, where a separator shall be inserted between each
|
||
* element, but not before the first one. */
|
||
|
||
if (!f)
|
||
f = stdout;
|
||
|
||
if (space) {
|
||
if (!separator)
|
||
separator = " ";
|
||
|
||
if (*space) {
|
||
r = fputs(separator, f);
|
||
if (r < 0)
|
||
return r;
|
||
}
|
||
|
||
*space = true;
|
||
}
|
||
|
||
return fputs(s, f);
|
||
}
|
||
|
||
int open_tmpfile_unlinkable(const char *directory, int flags) {
|
||
char *p;
|
||
int fd, r;
|
||
|
||
if (!directory) {
|
||
r = tmp_dir(&directory);
|
||
if (r < 0)
|
||
return r;
|
||
}
|
||
|
||
/* Returns an unlinked temporary file that cannot be linked into the file system anymore */
|
||
|
||
/* Try O_TMPFILE first, if it is supported */
|
||
fd = open(directory, flags|O_TMPFILE|O_EXCL, S_IRUSR|S_IWUSR);
|
||
if (fd >= 0)
|
||
return fd;
|
||
|
||
/* Fall back to unguessable name + unlinking */
|
||
p = strjoina(directory, "/systemd-tmp-XXXXXX");
|
||
|
||
fd = mkostemp_safe(p);
|
||
if (fd < 0)
|
||
return fd;
|
||
|
||
(void) unlink(p);
|
||
|
||
return fd;
|
||
}
|
||
|
||
int open_tmpfile_linkable(const char *target, int flags, char **ret_path) {
|
||
_cleanup_free_ char *tmp = NULL;
|
||
int r, fd;
|
||
|
||
assert(target);
|
||
assert(ret_path);
|
||
|
||
/* Don't allow O_EXCL, as that has a special meaning for O_TMPFILE */
|
||
assert((flags & O_EXCL) == 0);
|
||
|
||
/* Creates a temporary file, that shall be renamed to "target" later. If possible, this uses O_TMPFILE – in
|
||
* which case "ret_path" will be returned as NULL. If not possible a the tempoary path name used is returned in
|
||
* "ret_path". Use link_tmpfile() below to rename the result after writing the file in full. */
|
||
|
||
{
|
||
_cleanup_free_ char *dn = NULL;
|
||
|
||
dn = dirname_malloc(target);
|
||
if (!dn)
|
||
return -ENOMEM;
|
||
|
||
fd = open(dn, O_TMPFILE|flags, 0640);
|
||
if (fd >= 0) {
|
||
*ret_path = NULL;
|
||
return fd;
|
||
}
|
||
|
||
log_debug_errno(errno, "Failed to use O_TMPFILE on %s: %m", dn);
|
||
}
|
||
|
||
r = tempfn_random(target, NULL, &tmp);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
fd = open(tmp, O_CREAT|O_EXCL|O_NOFOLLOW|O_NOCTTY|flags, 0640);
|
||
if (fd < 0)
|
||
return -errno;
|
||
|
||
*ret_path = TAKE_PTR(tmp);
|
||
|
||
return fd;
|
||
}
|
||
|
||
int open_serialization_fd(const char *ident) {
|
||
int fd = -1;
|
||
|
||
fd = memfd_create(ident, MFD_CLOEXEC);
|
||
if (fd < 0) {
|
||
const char *path;
|
||
|
||
path = getpid_cached() == 1 ? "/run/systemd" : "/tmp";
|
||
fd = open_tmpfile_unlinkable(path, O_RDWR|O_CLOEXEC);
|
||
if (fd < 0)
|
||
return fd;
|
||
|
||
log_debug("Serializing %s to %s.", ident, path);
|
||
} else
|
||
log_debug("Serializing %s to memfd.", ident);
|
||
|
||
return fd;
|
||
}
|
||
|
||
int link_tmpfile(int fd, const char *path, const char *target) {
|
||
|
||
assert(fd >= 0);
|
||
assert(target);
|
||
|
||
/* Moves a temporary file created with open_tmpfile() above into its final place. if "path" is NULL an fd
|
||
* created with O_TMPFILE is assumed, and linkat() is used. Otherwise it is assumed O_TMPFILE is not supported
|
||
* on the directory, and renameat2() is used instead.
|
||
*
|
||
* Note that in both cases we will not replace existing files. This is because linkat() does not support this
|
||
* operation currently (renameat2() does), and there is no nice way to emulate this. */
|
||
|
||
if (path) {
|
||
if (rename_noreplace(AT_FDCWD, path, AT_FDCWD, target) < 0)
|
||
return -errno;
|
||
} else {
|
||
char proc_fd_path[STRLEN("/proc/self/fd/") + DECIMAL_STR_MAX(fd) + 1];
|
||
|
||
xsprintf(proc_fd_path, "/proc/self/fd/%i", fd);
|
||
|
||
if (linkat(AT_FDCWD, proc_fd_path, AT_FDCWD, target, AT_SYMLINK_FOLLOW) < 0)
|
||
return -errno;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
int read_nul_string(FILE *f, char **ret) {
|
||
_cleanup_free_ char *x = NULL;
|
||
size_t allocated = 0, n = 0;
|
||
|
||
assert(f);
|
||
assert(ret);
|
||
|
||
/* Reads a NUL-terminated string from the specified file. */
|
||
|
||
for (;;) {
|
||
int c;
|
||
|
||
if (!GREEDY_REALLOC(x, allocated, n+2))
|
||
return -ENOMEM;
|
||
|
||
c = fgetc(f);
|
||
if (c == 0) /* Terminate at NUL byte */
|
||
break;
|
||
if (c == EOF) {
|
||
if (ferror(f))
|
||
return -errno;
|
||
break; /* Terminate at EOF */
|
||
}
|
||
|
||
x[n++] = (char) c;
|
||
}
|
||
|
||
if (x)
|
||
x[n] = 0;
|
||
else {
|
||
x = new0(char, 1);
|
||
if (!x)
|
||
return -ENOMEM;
|
||
}
|
||
|
||
*ret = TAKE_PTR(x);
|
||
|
||
return 0;
|
||
}
|
||
|
||
int mkdtemp_malloc(const char *template, char **ret) {
|
||
char *p;
|
||
|
||
assert(template);
|
||
assert(ret);
|
||
|
||
p = strdup(template);
|
||
if (!p)
|
||
return -ENOMEM;
|
||
|
||
if (!mkdtemp(p)) {
|
||
free(p);
|
||
return -errno;
|
||
}
|
||
|
||
*ret = p;
|
||
return 0;
|
||
}
|
||
|
||
DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, funlockfile);
|
||
|
||
int read_line(FILE *f, size_t limit, char **ret) {
|
||
_cleanup_free_ char *buffer = NULL;
|
||
size_t n = 0, allocated = 0, count = 0;
|
||
|
||
assert(f);
|
||
|
||
/* Something like a bounded version of getline().
|
||
*
|
||
* Considers EOF, \n and \0 end of line delimiters, and does not include these delimiters in the string
|
||
* returned.
|
||
*
|
||
* Returns the number of bytes read from the files (i.e. including delimiters — this hence usually differs from
|
||
* the number of characters in the returned string). When EOF is hit, 0 is returned.
|
||
*
|
||
* The input parameter limit is the maximum numbers of characters in the returned string, i.e. excluding
|
||
* delimiters. If the limit is hit we fail and return -ENOBUFS.
|
||
*
|
||
* If a line shall be skipped ret may be initialized as NULL. */
|
||
|
||
if (ret) {
|
||
if (!GREEDY_REALLOC(buffer, allocated, 1))
|
||
return -ENOMEM;
|
||
}
|
||
|
||
{
|
||
_unused_ _cleanup_(funlockfilep) FILE *flocked = f;
|
||
flockfile(f);
|
||
|
||
for (;;) {
|
||
int c;
|
||
|
||
if (n >= limit)
|
||
return -ENOBUFS;
|
||
|
||
errno = 0;
|
||
c = fgetc_unlocked(f);
|
||
if (c == EOF) {
|
||
/* if we read an error, and have no data to return, then propagate the error */
|
||
if (ferror_unlocked(f) && n == 0)
|
||
return errno > 0 ? -errno : -EIO;
|
||
|
||
break;
|
||
}
|
||
|
||
count++;
|
||
|
||
if (IN_SET(c, '\n', 0)) /* Reached a delimiter */
|
||
break;
|
||
|
||
if (ret) {
|
||
if (!GREEDY_REALLOC(buffer, allocated, n + 2))
|
||
return -ENOMEM;
|
||
|
||
buffer[n] = (char) c;
|
||
}
|
||
|
||
n++;
|
||
}
|
||
}
|
||
|
||
if (ret) {
|
||
buffer[n] = 0;
|
||
|
||
*ret = buffer;
|
||
buffer = NULL;
|
||
}
|
||
|
||
return (int) count;
|
||
}
|