64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include "device-nodes.h"
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#include "utf8.h"
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int whitelisted_char_for_devnode(char c, const char *white) {
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if ((c >= '0' && c <= '9') ||
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(c >= 'A' && c <= 'Z') ||
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(c >= 'a' && c <= 'z') ||
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strchr("#+-.:=@_", c) != NULL ||
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(white != NULL && strchr(white, c) != NULL))
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return 1;
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return 0;
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}
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int encode_devnode_name(const char *str, char *str_enc, size_t len) {
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size_t i, j;
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if (!str || !str_enc)
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return -EINVAL;
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for (i = 0, j = 0; str[i] != '\0'; i++) {
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int seqlen;
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seqlen = utf8_encoded_valid_unichar(str + i, (size_t) -1);
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if (seqlen > 1) {
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if (len-j < (size_t)seqlen)
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return -EINVAL;
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memcpy(&str_enc[j], &str[i], seqlen);
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j += seqlen;
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i += (seqlen-1);
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} else if (str[i] == '\\' || !whitelisted_char_for_devnode(str[i], NULL)) {
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if (len-j < 4)
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return -EINVAL;
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sprintf(&str_enc[j], "\\x%02x", (unsigned char) str[i]);
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j += 4;
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} else {
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if (len-j < 1)
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return -EINVAL;
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str_enc[j] = str[i];
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j++;
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}
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}
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if (len-j < 1)
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return -EINVAL;
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str_enc[j] = '\0';
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return 0;
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}
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