diff options
Diffstat (limited to 'netfs-sample/options.c')
| -rw-r--r-- | netfs-sample/options.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/netfs-sample/options.c b/netfs-sample/options.c new file mode 100644 index 00000000..c39d3f2b --- /dev/null +++ b/netfs-sample/options.c @@ -0,0 +1,255 @@ +/*----------------------------------------------------------------------------*/ +/*options.h*/ +/*----------------------------------------------------------------------------*/ +/*Definitions for parsing the command line switches*/ +/*----------------------------------------------------------------------------*/ +/*Based on the code of unionfs translator.*/ +/*----------------------------------------------------------------------------*/ +/*Copyright (C) 2001, 2002, 2005 Free Software Foundation, Inc. + Written by Sergiu Ivanov <unlimitedscolobb@gmail.com>. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2 of the + License, or * (at your option) any later version. + + This program 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 + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 + USA.*/ +/*----------------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------------*/ +#define _GNU_SOURCE 1 +/*----------------------------------------------------------------------------*/ +#include <argp.h> +#include <error.h> +/*----------------------------------------------------------------------------*/ +#include "debug.h" +#include "options.h" +#include "ncache.h" +#include "node.h" +/*----------------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------------*/ +/*--------Macros--------------------------------------------------------------*/ +/*Short documentation for argp*/ +#define ARGS_DOC "DIR" +#define DOC "Shows the contents of DIR filtered according to PROPERTY.\ + If DIR is not specified, ~/ is assumed." +/*----------------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------------*/ +/*--------Forward Declarations------------------------------------------------*/ +/*Argp parser function for the common options*/ +static +error_t +argp_parse_common_options + ( + int key, + char * arg, + struct argp_state * state + ); +/*----------------------------------------------------------------------------*/ +/*Argp parser function for the startup options*/ +static +error_t +argp_parse_startup_options + ( + int key, + char * arg, + struct argp_state * state + ); +/*----------------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------------*/ +/*--------Global Variables----------------------------------------------------*/ +/*This variable is set to a non-zero value after the parsing of starup options + is finished*/ +/*Whenever the argument parser is later called to modify the + options of filterfs the root node will be initialized accordingly directly + by the parser*/ +static int parsing_startup_options_finished; +/*----------------------------------------------------------------------------*/ +/*Argp options common to both the runtime and the startup parser*/ +static const struct argp_option argp_common_options[] = + { + {OPT_LONG_CACHE_SIZE, OPT_CACHE_SIZE, "SIZE", 0, + "The maximal number of nodes in the node cache"}, + {OPT_LONG_PROPERTY, OPT_PROPERTY, "PROPERTY", 0, + "The command which will act as a filter"} + }; +/*----------------------------------------------------------------------------*/ +/*Argp options only meaningful for startupp parsing*/ +static const struct argp_option argp_startup_options[] = + { + {0} + }; +/*----------------------------------------------------------------------------*/ +/*Argp parser for only the common options*/ +static const struct argp argp_parser_common_options = + {argp_common_options, argp_parse_common_options, 0, 0, 0}; +/*----------------------------------------------------------------------------*/ +/*Argp parser for only the startup options*/ +static const struct argp argp_parser_startup_options = + {argp_startup_options, argp_parse_startup_options, 0, 0, 0}; +/*----------------------------------------------------------------------------*/ +/*The list of children parsers for runtime arguments*/ +static const struct argp_child argp_children_runtime[] = + { + {&argp_parser_common_options}, + {&netfs_std_runtime_argp}, + {0} + }; +/*----------------------------------------------------------------------------*/ +/*The list of children parsers for startup arguments*/ +static const struct argp_child argp_children_startup[] = + { + {&argp_parser_startup_options}, + {&argp_parser_common_options}, + {&netfs_std_startup_argp}, + {0} + }; +/*----------------------------------------------------------------------------*/ +/*The version of the server for argp*/ +const char * argp_program_version = "0.0"; +/*----------------------------------------------------------------------------*/ +/*The arpg parser for runtime arguments*/ +struct argp argp_runtime = + {0, 0, 0, 0, argp_children_runtime}; +/*----------------------------------------------------------------------------*/ +/*The argp parser for startup arguments*/ +struct argp argp_startup = + {0, 0, ARGS_DOC, DOC, argp_children_startup}; +/*----------------------------------------------------------------------------*/ +/*The filtering command*/ +char * property = NULL; +/*----------------------------------------------------------------------------*/ +/*The directory to filter*/ +char * dir = NULL; +/*----------------------------------------------------------------------------*/ + +/*----------------------------------------------------------------------------*/ +/*--------Functions-----------------------------------------------------------*/ +/*Argp parser function for the common options*/ +static +error_t +argp_parse_common_options + ( + int key, + char * arg, + struct argp_state * state + ) + { + error_t err = 0; + + /*Go through the possible options*/ + switch(key) + { + case OPT_CACHE_SIZE: + { + /*store the new cache-size*/ + ncache_size = strtol(arg, NULL, 10); + + break; + } + case OPT_PROPERTY: + { + /*try to duplicate the filtering command*/ + property = strdup(arg); + if(!property) + error(EXIT_FAILURE, ENOMEM, "Could not strdup the property"); + + break; + } + case ARGP_KEY_ARG: /*the directory to filter*/ + { + /*try to duplicate the directory name*/ + dir = strdup(arg); + if(!dir) + error(EXIT_FAILURE, ENOMEM, "argp_parse_common_options: " + "Could not strdup the directory"); + + /*fill all trailing spaces with 0*/ + int i = strlen(dir) - 1; + /*for(i = strlen(dir) - 1; (i >= 0) && (dir[i] == ' '); dir[i--] = 0);*/ + /*the original filename may contain spaces*/ + + /*If the last non blank symbol is a '/' and it's not the only one*/ + if((dir[i] == '/') && (i != 0)) + /*put 0 instead*/ + dir[i] = 0; + + LOG_MSG("argp_parse_common_options: Filtering the directory %s.", dir); + + break; + } + case ARGP_KEY_END: + { + /*If parsing of startup options has not finished*/ + if(!parsing_startup_options_finished) + { + /*reset the cache*/ + ncache_reset(); + + /*If the directory has not been specified*/ + if(!dir) + { + /*assume the directory to be the home directory*/ + ; + + /*FIXME: The default directory is /var/tmp*/ + dir = "/var/tmp"; + } + + /*set the flag that the startup options have already been parsed*/ + parsing_startup_options_finished = 1; + } + else + { +/*TODO: Take care of runtime calls modifying the property*/ + } + } + /*If the option could not be recognized*/ + default: + { + /*set the error code*/ + err = ARGP_ERR_UNKNOWN; + } + } + + /*Return the result*/ + return err; + }/*argp_parse_common_options*/ +/*----------------------------------------------------------------------------*/ +/*Argp parser function for the startup options*/ +static +error_t +argp_parse_startup_options + ( + int key, + char * arg, + struct argp_state * state + ) + { + /*Do nothing in a beautiful way*/ + error_t err = 0; + + switch(key) + { + default: + { + err = ARGP_ERR_UNKNOWN; + + break; + } + } + + return err; + }/*argp_parse_startup_options*/ +/*----------------------------------------------------------------------------*/ |