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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2008-2011 Kay Sievers
***/
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "device-nodes.h"
#include "utf8.h"
int whitelisted_char_for_devnode(char c, const char *white) {
if ((c >= '0' && c <= '9') ||
(c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z') ||
strchr("#+-.:=@_", c) != NULL ||
(white != NULL && strchr(white, c) != NULL))
return 1;
return 0;
}
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]);
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] == '\\' || !whitelisted_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;
}
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