/* 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); /* What to return for unrecognized keys. For special ARGP_KEY_ keys, such returns will simply be ignored. For user keys, this error will be turned into EINVAL (if the call to argp_parse is such that errors are propagated back to the user instead of exiting); returning EINVAL itself would result in an immediate stop to parsing in *all* cases. */ #define ARGP_ERR_UNKNOWN E2BIG /* Hurd should never need E2BIG. XXX */ /* Special values for the KEY argument to an argument parsing function. ARGP_ERR_UNKNOWN should be returned if they aren't understood. The sequence of keys to parser calls is either (where opt is a user key): ARGP_KEY_INIT (opt | ARGP_KEY_ARG)... ARGP_KEY_END or ARGP_KEY_INIT opt... ARGP_KEY_NO_ARGS ARGP_KEY_END If an error occurs, then the parser is called with ARGP_KEY_ERR, and no other calls are made. */ /* 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 /* Passed in before any parsing is done. Afterwards, the values of each element of the CHILD_INPUT field, if any, in the state structure is copied to each child's state to be the initial value of the INPUT field. */ #define ARGP_KEY_INIT 3 /* Passed in when parsing has successfully been completed (even if there are still arguments remaining). */ #define ARGP_KEY_SUCCESS 4 /* Passed in if an error occurs (in which case a call with ARGP_KEY_SUCCESS is never made, so any cleanup must be done here). */ #define ARGP_KEY_ERROR 5 /* 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 CHILD 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, ARGP_ERR_UNKNOWN should be returned. If a non-zero, non-ARGP_ERR_UNKNOWN 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 CHILDREN 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 **children; }; /* 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; /* An arbitrary pointer passed in from the user. */ void *input; /* Values to pass to child parsers. This vector will be the same length as the number of children for the current parser. */ void **child_inputs; /* For the parser's use. Initialized to 0. */ void *hook; /* The name used when printing messages. This is initialized to ARGV[0], or PROGRAM_INVOCATION_NAME if that is unavailable. */ char *name; /* Streams used when argp prints something. */ FILE *err_stream; /* For errors; initialized to stderr. */ FILE *out_stream; /* For information; initialized to stdout. */ }; /* 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. This flag implies ARGP_NO_EXIT (on the assumption that silent exiting upon errors is bad behaviour). */ #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 ARGP_ERR_UNKNOWN; 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 standard long option --help, which causes usage and option help information to be output to stdout, and exit (0) called. */ #define ARGP_NO_HELP 0x10 /* Don't exit on errors (they may still result in error messages). */ #define ARGP_NO_EXIT 0x20 /* Turns off any message-printing/exiting options. */ #define ARGP_SILENT (ARGP_NO_EXIT | 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, ARGP_ERR_UNKNOWN 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. INPUT is a pointer to a value to be passed in to the parser. */ error_t argp_parse (const struct argp *argp, int argc, char **argv, unsigned flags, int *arg_index, void *input); /* Global variables. */ /* If defined or set by the user program to a non-zero value, then a default option --version is added (unless the ARGP_NO_HELP flag is used), which will print this this string followed by a newline and exit (unless the ARGP_NO_EXIT flag is used). Overridden by ARGP_PROGRAM_VERSION_HOOK. */ extern char *argp_program_version; /* If defined or set by the user program to a non-zero value, then a default option --version is added (unless the ARGP_NO_HELP flag is used), which calls this function with a stream to print the version to and a pointer to the current parsing state, and then exits (unless the ARGP_NO_EXIT flag is used). This variable takes precedent over ARGP_PROGRAM_VERSION. */ extern void (*argp_program_version_hook) (FILE *stream, struct argp_state *state); /* If defined or set by the user program, it should point to string that is the bug-reporting address for the program. It will be printed by argp_help if the ARGP_HELP_BUG_ADDR flag is set (as it is by various standard help messages), embedded in a sentence that says something like `Report bugs to ADDR.'. */ extern char *argp_program_bug_address; /* Flags for argp_help. */ #define ARGP_HELP_USAGE 0x01 /* a Usage: message. */ #define ARGP_HELP_SHORT_USAGE 0x02 /* " but don't actually print options. */ #define ARGP_HELP_SEE 0x04 /* a `Try ... for more help' message. */ #define ARGP_HELP_LONG 0x08 /* a long help message. */ #define ARGP_HELP_PRE_DOC 0x10 /* doc string preceding long help. */ #define ARGP_HELP_POST_DOC 0x20 /* doc string following long help. */ #define ARGP_HELP_DOC (ARGP_HELP_PRE_DOC | ARGP_HELP_POST_DOC) #define ARGP_HELP_BUG_ADDR 0x40 /* bug report address */ /* These ARGP_HELP flags are only understood by argp_state_help. */ #define ARGP_HELP_EXIT_ERR 0x100 /* Call exit(1) instead of returning. */ #define ARGP_HELP_EXIT_OK 0x200 /* Call exit(0) instead of returning. */ /* The standard thing to do after a program command line parsing error, if an error message 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 \ | ARGP_HELP_DOC | ARGP_HELP_BUG_ADDR) /* Output a usage message for ARGP to STREAM. FLAGS are from the set ARGP_HELP_*. */ extern void argp_help (const struct argp *argp, FILE *stream, unsigned flags, char *name); /* The following routines are intended to be called from within an argp parsing routine (thus taking an argp_state structure as the first argument). They may or may not print an error message and exit, depending on the flags in STATE -- in any case, the caller should be prepared for them *not* to exit, and should return an appropiate error after calling them. [argp_usage & argp_error should probably be called argp_state_..., but they're used often enough that they should be short] */ /* Output, if appropriate, a usage message for STATE to STREAM. FLAGS are from the set ARGP_HELP_*. */ void argp_state_help (struct argp_state *state, FILE *stream, unsigned flags); /* Possibly output the standard usage message for ARGP to stderr and exit. */ extern inline void argp_usage (struct argp_state *state) { argp_state_help (state, stderr, ARGP_HELP_STD_USAGE); } /* If appropriate, 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). */ void argp_error (struct argp_state *state, const char *fmt, ...) __attribute__ ((format (printf, 2, 3))); /* Similar to the standard gnu error-reporting function error(), but will respect the ARGP_NO_EXIT and ARGP_NO_ERRS flags in STATE, and will print to STATE->err_stream. This is useful for argument parsing code that is shared between program startup (when exiting is desired) and runtime option parsing (when typically an error code is returned instead). The difference between this function and argp_error is that the latter is for *parsing errors*, and the former is for other problems that occur during parsing but don't reflect a (syntactic) problem with the input. */ void argp_failure (struct argp_state *state, int status, int errnum, const char *fmt, ...) __attribute__ ((format (printf, 4, 5))); /* 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__ */