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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include "device-nodes.h"
#include "path-util.h"
#include "string-util.h"
#include "utf8.h"
int allow_listed_char_for_devnode(char c, const char *additional) {
return
ascii_isdigit(c) ||
ascii_isalpha(c) ||
strchr("#+-.:=@_", c) ||
(additional && strchr(additional, c));
}
int encode_devnode_name(const char *str, char *str_enc, size_t len) {
size_t i, j;
if (!str || !str_enc)
return -EINVAL;
for (i = 0, j = 0; str[i] != '\0'; i++) {
int seqlen;
seqlen = utf8_encoded_valid_unichar(str + i, SIZE_MAX);
if (seqlen > 1) {
if (len-j < (size_t) seqlen)
return -EINVAL;
memcpy(&str_enc[j], &str[i], seqlen);
j += seqlen;
i += (seqlen-1);
} else if (str[i] == '\\' || !allow_listed_char_for_devnode(str[i], NULL)) {
if (len-j < 4)
return -EINVAL;
sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]);
j += 4;
} else {
if (len-j < 1)
return -EINVAL;
str_enc[j] = str[i];
j++;
}
}
if (len-j < 1)
return -EINVAL;
str_enc[j] = '\0';
return 0;
}
int devnode_same(const char *a, const char *b) {
struct stat sa, sb;
assert(a);
assert(b);
if (!valid_device_node_path(a) || !valid_device_node_path(b))
return -EINVAL;
if (stat(a, &sa) < 0)
return -errno;
if (stat(b, &sb) < 0)
return -errno;
if (!S_ISBLK(sa.st_mode) && !S_ISCHR(sa.st_mode))
return -ENODEV;
if (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode))
return -ENODEV;
if (((sa.st_mode ^ sb.st_mode) & S_IFMT) != 0) /* both inode same device node type? */
return false;
return sa.st_rdev == sb.st_rdev;
}
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