11a1589223
Files which are installed as-is (any .service and other unit files, .conf files, .policy files, etc), are left as is. My assumption is that SPDX identifiers are not yet that well known, so it's better to retain the extended header to avoid any doubt. I also kept any copyright lines. We can probably remove them, but it'd nice to obtain explicit acks from all involved authors before doing that.
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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***/
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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 "macro.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
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* escape 0-9 if it's the first character */
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if (!(*f >= 'A' && *f <= 'Z') &&
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!(*f >= 'a' && *f <= 'z') &&
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!(f > s && *f >= '0' && *f <= '9')) {
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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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/* 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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