mirror of
https://github.com/morgan9e/systemd
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83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <stdlib.h>
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#include "alloc-util.h"
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#include "bus-label.h"
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#include "hexdecoct.h"
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#include "string-util.h"
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char* bus_label_escape(const char *s) {
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char *r, *t;
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const char *f;
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assert_return(s, NULL);
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/* Escapes all chars that D-Bus' object path cannot deal
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* with. Can be reversed with bus_path_unescape(). We special
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* case the empty string. */
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if (*s == 0)
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return strdup("_");
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r = new(char, strlen(s)*3 + 1);
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if (!r)
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return NULL;
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for (f = s, t = r; *f; f++) {
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/* Escape everything that is not a-zA-Z0-9. We also escape 0-9 if it's the first character */
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if (!ascii_isalpha(*f) &&
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!(f > s && ascii_isdigit(*f))) {
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*(t++) = '_';
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*(t++) = hexchar(*f >> 4);
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*(t++) = hexchar(*f);
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} else
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*(t++) = *f;
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}
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*t = 0;
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return r;
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}
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char* bus_label_unescape_n(const char *f, size_t l) {
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char *r, *t;
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size_t i;
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assert_return(f, NULL);
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if (l == SIZE_MAX)
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l = strlen(f);
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/* Special case for the empty string */
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if (l == 1 && *f == '_')
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return strdup("");
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r = new(char, l + 1);
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if (!r)
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return NULL;
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for (i = 0, t = r; i < l; ++i) {
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if (f[i] == '_') {
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int a, b;
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if (l - i < 3 ||
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(a = unhexchar(f[i + 1])) < 0 ||
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(b = unhexchar(f[i + 2])) < 0) {
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/* Invalid escape code, let's take it literal then */
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*(t++) = '_';
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} else {
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*(t++) = (char) ((a << 4) | b);
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i += 2;
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}
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} else
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*(t++) = f[i];
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}
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*t = 0;
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return r;
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}
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