/* Hierarchial argument parsing, layered over getopt Copyright (C) 1995, 1996 Free Software Foundation, Inc. Written by Miles Bader This file is part of the GNU Hurd. The GNU Hurd 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, or (at your option) any later version. The GNU Hurd 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #ifndef __ARGP_H__ #define __ARGP_H__ #include #include #include #include /* A description of a particular option. A pointer to an array of these is passed in the OPTIONS field of an argp structure. Each option entry can correspond to one long option and/or one short option; more names for the same option can be added by following an entry in an option array with options having the OPTION_ALIAS flag set. */ struct argp_option { /* The long option name. For more than one name for the same option, you can use following options with the OPTION_ALIAS flag set. */ const char *name; /* What key is returned for this option. If > 0 and printable, then it's also accepted as a short option. */ int key; /* If non-NULL, this is the name of the argument associated with this option, which is required unless the OPTION_ARG_OPTIONAL flag is set. */ const char *arg; /* OPTION_ flags. */ int flags; /* The doc string for this option. If both NAME and KEY are 0, This string will be printed outdented from the normal option column, making it useful as a group header (it will be the first thing printed in its group); in this usage, it's conventional to end the string with a `:'. */ const char *doc; /* The group this option is in. In a long help message, options are sorted alphabetically within each group, and the groups presented in the order 1, 2, ..., n, 0, -m, ..., -2, -1. Every entry in an options array with if this field 0 will inherit the group number of the previous entry, or zero if it's the first one. Automagic options such as --help are put into group -1. */ int group; }; /* The argument associated with this option is optional. */ #define OPTION_ARG_OPTIONAL 0x1 /* This option isn't displayed in any help messages. */ #define OPTION_HIDDEN 0x2 /* This option is an alias for the closest previous non-alias option. This means that it will be displayed in the same help entry, and will inherit fields other than NAME and KEY from the aliased option. */ #define OPTION_ALIAS 0x4 struct argp; /* fwd declare this type */ struct argp_state; /* " */ /* The type of a pointer to an argp parsing function. */ typedef error_t (*argp_parser_t)(int key, char *arg, struct argp_state *state); /* Special values for the KEY argument to an argument parsing function. EINVAL should be returned if they aren't understood. The sequence of keys to parser calls is either (where opt is a user key): (opt | ARGP_KEY_ARG)... ARGP_KEY_END or opt... ARGP_KEY_NO_ARGS ARGP_KEY_END. */ /* This is not an option at all, but rather a command line argument. If a parser receiving this key returns success, the fact is recorded, and the ARGP_KEY_NO_ARGS case won't be used. HOWEVER, if while processing the argument, a parser function decrements the NEXT field of the state it's passed, the option won't be considered processed; this is to allow you to actually modify the argument (perhaps into an option), and have it processed again. */ #define ARGP_KEY_ARG 0 /* There are no more command line arguments at all. */ #define ARGP_KEY_END 1 /* Because it's common to want to do some special processing if there aren't any non-option args, user parsers are called with this key if they didn't successfully process any non-option arguments. Called just before ARGP_KEY_END (where more general validity checks on previously parsed arguments can take place). */ #define ARGP_KEY_NO_ARGS 2 /* An argp structure contains a set of getopt options declarations, a function to deal with getting one, and an optional pointer to another argp structure. When actually parsing options, getopt is called with the union of all the argp structures chained together through their PARENT pointers, with conflicts being resolved in favor of the first occurance in the chain. */ struct argp { /* An array of argp_option structures, terminated by an entry with both NAME and KEY having a value of 0. */ const struct argp_option *options; /* What to do with an option from this structure. KEY is the key associated with the option, and ARG is any associated argument (NULL if none was supplied). If KEY isn't understood, EINVAL should be returned. If a non-zero, non-EINVAL value is returned, then parsing is stopped immediately, and that value is returned from argp_parse(). For special (non-user-supplied) values of KEY, see the ARGP_KEY_ definitions below. */ argp_parser_t parser; /* A string describing what other arguments are wanted by this program. It is only used by argp_usage to print the `Usage:' message. */ const char *args_doc; /* A string containing extra text to be printed after the options in a long help message, if it is non-NULL. */ const char *doc; /* A NULL terminated list of other argp structures that should be parsed with this one. Any conflicts are resolved in favor of this argp, or early argps in the PARENTS list. This field is useful if you use libraries that supply their own argp structure, which you want to use in conjunction with your own. */ const struct argp **parents; }; /* Parsing state. This is provided to parsing functions called by argp, which may examine and, as noted, modify fields. */ struct argp_state { /* The top level ARGP being parsed. */ const struct argp *argp; /* The argument vector being parsed. May be modified. */ int argc; char **argv; /* The index in ARGV of the next arg that to be parsed. May be modified. */ int next; /* The flags supplied to argp_parse. May be modified. */ unsigned flags; /* While calling a parsing function with a key of ARGP_KEY_ARG, this is the number of the current arg, starting at zero, and incremented after each such call returns. At all other times, this is the number of such arguments that have been processed. */ unsigned arg_num; /* If non-zero, the index in ARGV of the first argument following a special `--' argument (which prevents anything following being interpreted as an option). Only set once argument parsing has proceeded past this point. */ int quoted; }; /* Flags for argp_parse (note that the defaults are those that are convenient for program command line parsing): */ /* Don't ignore the first element of ARGV. Normally (and always unless ARGP_NO_ERRS is set) the first element of the argument vector is skipped for option parsing purposes, as it corresponds to the program name in a command line. */ #define ARGP_PARSE_ARGV0 0x1 /* Don't print error messages for unknown options to stderr; unless this flag is set, ARGP_PARSE_ARGV0 is ignored, as ARGV[0] is used as the program name in the error messages. */ #define ARGP_NO_ERRS 0x2 /* Don't parse any non-option args. Normally non-option args are parsed by calling the parse functions with a key of ARGP_KEY_ARG, and the actual arg as the value. Since it's impossible to know which parse function wants to handle it, each one is called in turn, until one returns 0 or an error other than EINVAL; if an argument is handled by no one, the argp_parse returns prematurely (but with a return value of 0). If all args have been parsed without error, all parsing functions are called one last time with a key of ARGP_KEY_END. This flag needn't normally be set, as the normal behavior is to stop parsing as soon as some argument can't be handled. */ #define ARGP_NO_ARGS 0x4 /* Parse options and arguments in the same order they occur on the command line -- normally they're rearranged so that all options come first. */ #define ARGP_IN_ORDER 0x8 /* Don't provide the following standard help behavior: o A long option --help is automatically added, which causes usage and option help information to be output to stdout, and exit (0) called. o Any option parsing errors will result in a short `Try --help' message to be output to stderr and exit (1) called. */ #define ARGP_NO_HELP 0x16 /* Disables the exiting behavior of the above default argp help messages. */ #define ARGP_NO_EXIT 0x32 /* Turns off any message-printing/exiting options. */ #define ARGP_SILENT (ARGP_NO_ERRS | ARGP_NO_HELP) /* Parse the options strings in ARGC & ARGV according to the options in ARGP. FLAGS is one of the ARGP_ flags above. If ARG_INDEX is non-NULL, the index in ARGV of the first unparsed option is returned in it. If an unknown option is present, EINVAL is returned; if some parser routine returned a non-zero value, it is returned; otherwise 0 is returned. This function may also call exit unless the ARGP_NO_HELP flag is set. */ error_t argp_parse (const struct argp *argp, int argc, char **argv, unsigned flags, int *arg_index); /* Flags for argp_help. */ #define ARGP_HELP_USAGE 0x01 /* Print a Usage: message. */ #define ARGP_HELP_SHORT_USAGE 0x02 /* " but don't actually print options. */ #define ARGP_HELP_SEE 0x04 /* Print a `for more help...' message. */ #define ARGP_HELP_LONG 0x08 /* Print a long help message. */ #define ARGP_HELP_EXIT_ERR 0x10 /* Call exit(1) instead of returning. */ #define ARGP_HELP_EXIT_OK 0x20 /* Call exit(0) instead of returning. */ /* If used as a flag to argp_help, this has the same effect as ARGP_HELP_EXIT_ERR. However it can be used to clear both types of exit flags at once. */ #define ARGP_HELP_EXIT (ARGP_HELP_EXIT_ERR | ARGP_HELP_EXIT_OK) /* The standard thing to do after a program command line parsing error, if an error messages has already been printed. */ #define ARGP_HELP_STD_ERR \ (ARGP_HELP_SEE | ARGP_HELP_EXIT_ERR) /* The standard thing to do after a program command line parsing error, if no more specific error message has been printed. */ #define ARGP_HELP_STD_USAGE \ (ARGP_HELP_SHORT_USAGE | ARGP_HELP_SEE | ARGP_HELP_EXIT_ERR) /* The standard thing to do in response to a --help option. */ #define ARGP_HELP_STD_HELP \ (ARGP_HELP_SHORT_USAGE | ARGP_HELP_LONG | ARGP_HELP_EXIT_OK) /* Output a usage message for ARGP to STREAM. FLAGS are from the set ARGP_HELP_*. */ void argp_help (const struct argp *argp, FILE *stream, unsigned flags); /* Output the standard usage message for ARGP to stderr and exit (1). */ void argp_usage (const struct argp *argp) __attribute__ ((noreturn)); extern inline void argp_usage (const struct argp *argp) { argp_help (argp, stderr, ARGP_HELP_STD_USAGE); } /* Print the printf string FMT and following args, preceded by the program name and `:', to stderr, and followed by a `Try ... --help' message. Then exit (1). */ extern void argp_error (const struct argp *argp, const char *fmt, ...) __attribute__ ((noreturn, format (printf, 2, 3))); /* Returns true if the option OPT is a valid short option. */ extern inline int _option_is_short (const struct argp_option *opt) { int key = opt->key; return key > 0 && isprint (key); } /* Returns true if the option OPT is in fact the last (unused) entry in an options array. */ extern inline int _option_is_end (const struct argp_option *opt) { return !opt->key && !opt->name && !opt->doc && !opt->group; } #endif /* __ARGP_H__ */