diff options
author | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-06-01 15:52:09 -0400 |
---|---|---|
committer | Luke Shumaker <lukeshu@sbcglobal.net> | 2016-06-01 15:52:09 -0400 |
commit | bb110bc7433adeb79b4814ef2a1c04e2160be396 (patch) | |
tree | c45048907133b8bbd7e2d86b350436a9ad0ffe8b /src/libbasic/bus-label.c | |
parent | 192d82912f055a2b4a2b5c02f0ef69b002322bba (diff) |
./move.sh
Diffstat (limited to 'src/libbasic/bus-label.c')
-rw-r--r-- | src/libbasic/bus-label.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/src/libbasic/bus-label.c b/src/libbasic/bus-label.c new file mode 100644 index 0000000000..d4531c7947 --- /dev/null +++ b/src/libbasic/bus-label.c @@ -0,0 +1,98 @@ +/*** + This file is part of systemd. + + Copyright 2013 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <stdlib.h> + +#include "alloc-util.h" +#include "bus-label.h" +#include "hexdecoct.h" +#include "macro.h" + +char *bus_label_escape(const char *s) { + char *r, *t; + const char *f; + + assert_return(s, NULL); + + /* Escapes all chars that D-Bus' object path cannot deal + * with. Can be reversed with bus_path_unescape(). We special + * case the empty string. */ + + if (*s == 0) + return strdup("_"); + + r = new(char, strlen(s)*3 + 1); + if (!r) + return NULL; + + for (f = s, t = r; *f; f++) { + + /* Escape everything that is not a-zA-Z0-9. We also + * escape 0-9 if it's the first character */ + + if (!(*f >= 'A' && *f <= 'Z') && + !(*f >= 'a' && *f <= 'z') && + !(f > s && *f >= '0' && *f <= '9')) { + *(t++) = '_'; + *(t++) = hexchar(*f >> 4); + *(t++) = hexchar(*f); + } else + *(t++) = *f; + } + + *t = 0; + + return r; +} + +char *bus_label_unescape_n(const char *f, size_t l) { + char *r, *t; + size_t i; + + assert_return(f, NULL); + + /* Special case for the empty string */ + if (l == 1 && *f == '_') + return strdup(""); + + r = new(char, l + 1); + if (!r) + return NULL; + + for (i = 0, t = r; i < l; ++i) { + if (f[i] == '_') { + int a, b; + + if (l - i < 3 || + (a = unhexchar(f[i + 1])) < 0 || + (b = unhexchar(f[i + 2])) < 0) { + /* Invalid escape code, let's take it literal then */ + *(t++) = '_'; + } else { + *(t++) = (char) ((a << 4) | b); + i += 2; + } + } else + *(t++) = f[i]; + } + + *t = 0; + + return r; +} |