src/basic/cap-list.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2014 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <string.h>
  22
  23 #include "cap-list.h"
  24 #include "macro.h"
  25 #include "missing.h"
  26 #include "parse-util.h"
  27 #include "util.h"
  28
  29 static const struct capability_name* lookup_capability(register const char *str, register unsigned int len);
  30
  31 #include "cap-from-name.h"
  32 #include "cap-to-name.h"
  33
  34 const char *capability_to_name(int id) {
  35
  36         if (id < 0)
  37                 return NULL;
  38
  39         if (id >= (int) ELEMENTSOF(capability_names))
  40                 return NULL;
  41
  42         return capability_names[id];
  43 }
  44
  45 int capability_from_name(const char *name) {
  46         const struct capability_name *sc;
  47         int r, i;
  48
  49         assert(name);
  50
  51         /* Try to parse numeric capability */
  52         r = safe_atoi(name, &i);
  53         if (r >= 0 && i >= 0)
  54                 return i;
  55
  56         /* Try to parse string capability */
  57         sc = lookup_capability(name, strlen(name));
  58         if (!sc)
  59                 return -EINVAL;
  60
  61         return sc->id;
  62 }
  63
  64 int capability_list_length(void) {
  65         return (int) ELEMENTSOF(capability_names);
  66 }