commands.h

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public
   4  * License v2 as published by the Free Software Foundation.
   5  *
   6  * This program is distributed in the hope that it will be useful,
   7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   9  * General Public License for more details.
  10  *
  11  * You should have received a copy of the GNU General Public
  12  * License along with this program; if not, write to the
  13  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  14  * Boston, MA 021110-1307, USA.
  15  */
  16
  17 #define ARGV0_BUF_SIZE  64
  18
  19 struct cmd_struct {
  20         const char *token;
  21         int (*fn)(int, char **);
  22
  23         /*
  24          * Usage strings
  25          *
  26          * A NULL-terminated array of the following format:
  27          *
  28          *   usagestr[0] - one-line synopsis (required)
  29          *   usagestr[1] - one-line short description (required)
  30          *   usagestr[2..m] - a long (possibly multi-line) description
  31          *                    (optional)
  32          *   usagestr[m + 1] - an empty line separator (required if at least one
  33          *                     option string is given, not needed otherwise)
  34          *   usagestr[m + 2..n] - option strings, one option per line
  35          *                        (optional)
  36          *   usagestr[n + 1] - NULL terminator
  37          *
  38          * Options (if present) should always (even if there is no long
  39          * description) be prepended with an empty line.  Supplied strings are
  40          * indented but otherwise printed as-is, no automatic wrapping is done.
  41          *
  42          * Grep for cmd_*_usage[] for examples.
  43          */
  44         const char * const *usagestr;
  45
  46         /* should be NULL if token is not a subgroup */
  47         const struct cmd_group *next;
  48
  49         /* if true don't list this token in help listings */
  50         int hidden;
  51 };
  52
  53 struct cmd_group {
  54         const char * const *usagestr;
  55         const char *infostr;
  56
  57         const struct cmd_struct commands[];
  58 };
  59
  60 /* btrfs.c */
  61 int prefixcmp(const char *str, const char *prefix);
  62
  63 int check_argc_exact(int nargs, int expected);
  64 int check_argc_min(int nargs, int expected);
  65 int check_argc_max(int nargs, int expected);
  66
  67 int handle_command_group(const struct cmd_group *grp, int argc,
  68                          char **argv);
  69
  70 /* help.c */
  71 extern const char * const generic_cmd_help_usage[];
  72
  73 void usage(const char * const *usagestr);
  74 void usage_command(const struct cmd_struct *cmd, int full, int err);
  75 void usage_command_group(const struct cmd_group *grp, int all, int err);
  76
  77 void help_unknown_token(const char *arg, const struct cmd_group *grp);
  78 void help_ambiguous_token(const char *arg, const struct cmd_group *grp);
  79
  80 void help_command_group(const struct cmd_group *grp, int argc, char **argv);
  81
  82 /* common.c */
  83 int open_file_or_dir(const char *fname);
  84
  85 extern const struct cmd_group subvolume_cmd_group;
  86 extern const struct cmd_group filesystem_cmd_group;
  87 extern const struct cmd_group balance_cmd_group;
  88 extern const struct cmd_group device_cmd_group;
  89 extern const struct cmd_group scrub_cmd_group;
  90 extern const struct cmd_group inspect_cmd_group;
  91
  92 int cmd_subvolume(int argc, char **argv);
  93 int cmd_filesystem(int argc, char **argv);
  94 int cmd_balance(int argc, char **argv);
  95 int cmd_device(int argc, char **argv);
  96 int cmd_scrub(int argc, char **argv);
  97 int cmd_inspect(int argc, char **argv);