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udev: move udev_node_escape_path()

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No functionality is changed.
This commit is contained in:
Yu Watanabe 2022-04-11 11:25:37 +09:00
parent d96c7550a0
commit b9168275c3
1 changed files with 42 additions and 42 deletions
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84
src/udev/udev-node.c
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@ -222,48 +222,6 @@ static int link_find_prioritized(sd_device *dev, bool add, const char *stackdir,
return !!*ret;
}
size_t udev_node_escape_path(const char *src, char *dest, size_t size) {
size_t i, j;
uint64_t h;
assert(src);
assert(dest);
assert(size >= 12);
for (i = 0, j = 0; src[i] != '\0'; i++) {
if (src[i] == '/') {
if (j+4 >= size - 12 + 1)
goto toolong;
memcpy(&dest[j], "\\x2f", 4);
j += 4;
} else if (src[i] == '\\') {
if (j+4 >= size - 12 + 1)
goto toolong;
memcpy(&dest[j], "\\x5c", 4);
j += 4;
} else {
if (j+1 >= size - 12 + 1)
goto toolong;
dest[j] = src[i];
j++;
}
}
dest[j] = '\0';
return j;
toolong:
/* If the input path is too long to encode as a filename, then let's suffix with a string
* generated from the hash of the path. */
h = siphash24_string(src, UDEV_NODE_HASH_KEY.bytes);
for (unsigned k = 0; k <= 10; k++)
dest[size - k - 2] = urlsafe_base64char((h >> (k * 6)) & 63);
dest[size - 1] = '\0';
return size - 1;
}
static int update_timestamp(sd_device *dev, const char *path, struct stat *prev) {
assert(path);
assert(prev);
@ -414,6 +372,48 @@ static int update_stack_directory(sd_device *dev, const char *dirname, bool add)
return log_device_debug_errno(dev, SYNTHETIC_ERRNO(ELOOP), "Failed to create symbolic link %s: %m", filename);
}
size_t udev_node_escape_path(const char *src, char *dest, size_t size) {
size_t i, j;
uint64_t h;
assert(src);
assert(dest);
assert(size >= 12);
for (i = 0, j = 0; src[i] != '\0'; i++) {
if (src[i] == '/') {
if (j+4 >= size - 12 + 1)
goto toolong;
memcpy(&dest[j], "\\x2f", 4);
j += 4;
} else if (src[i] == '\\') {
if (j+4 >= size - 12 + 1)
goto toolong;
memcpy(&dest[j], "\\x5c", 4);
j += 4;
} else {
if (j+1 >= size - 12 + 1)
goto toolong;
dest[j] = src[i];
j++;
}
}
dest[j] = '\0';
return j;
toolong:
/* If the input path is too long to encode as a filename, then let's suffix with a string
* generated from the hash of the path. */
h = siphash24_string(src, UDEV_NODE_HASH_KEY.bytes);
for (unsigned k = 0; k <= 10; k++)
dest[size - k - 2] = urlsafe_base64char((h >> (k * 6)) & 63);
dest[size - 1] = '\0';
return size - 1;
}
/* manage "stack of names" with possibly specified device priorities */
static int link_update(sd_device *dev, const char *slink_in, bool add) {
_cleanup_free_ char *slink = NULL, *dirname = NULL;