argp/argp.h

   1 /* Hierarchial argument parsing, layered over getopt.
   2    Copyright (C) 1995-1999, 2003, 2004, 2005, 2006, 2007
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Written by Miles Bader <miles@gnu.ai.mit.edu>.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, write to the Free
  19    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  20    02111-1307 USA.  */
  21
  22 #ifndef _ARGP_H
  23 #define _ARGP_H
  24
  25 #include <stdio.h>
  26 #include <ctype.h>
  27 #include <getopt.h>
  28 #include <limits.h>
  29
  30 #define __need_error_t
  31 #include <errno.h>
  32
  33 #ifndef __const
  34 # define __const const
  35 #endif
  36
  37 #ifndef __THROW
  38 # define __THROW
  39 #endif
  40 #ifndef __NTH
  41 # define __NTH(fct) fct __THROW
  42 #endif
  43
  44 #ifndef __attribute__
  45 /* This feature is available in gcc versions 2.5 and later.  */
  46 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
  47 #  define __attribute__(Spec) /* empty */
  48 # endif
  49 /* The __-protected variants of `format' and `printf' attributes
  50    are accepted by gcc versions 2.6.4 (effectively 2.7) and later.  */
  51 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7) || __STRICT_ANSI__
  52 #  define __format__ format
  53 #  define __printf__ printf
  54 # endif
  55 #endif
  56
  57 /* GCC 2.95 and later have "__restrict"; C99 compilers have
  58    "restrict", and "configure" may have defined "restrict".  */
  59 #ifndef __restrict
  60 # if ! (2 < __GNUC__ || (2 == __GNUC__ && 95 <= __GNUC_MINOR__))
  61 #  if defined restrict || 199901L <= __STDC_VERSION__
  62 #   define __restrict restrict
  63 #  else
  64 #   define __restrict
  65 #  endif
  66 # endif
  67 #endif
  68
  69 #ifndef __error_t_defined
  70 typedef int error_t;
  71 # define __error_t_defined
  72 #endif
  73 \f
  74 #ifdef  __cplusplus
  75 extern "C" {
  76 #endif
  77
  78 /* A description of a particular option.  A pointer to an array of
  79    these is passed in the OPTIONS field of an argp structure.  Each option
  80    entry can correspond to one long option and/or one short option; more
  81    names for the same option can be added by following an entry in an option
  82    array with options having the OPTION_ALIAS flag set.  */
  83 struct argp_option
  84 {
  85   /* The long option name.  For more than one name for the same option, you
  86      can use following options with the OPTION_ALIAS flag set.  */
  87   __const char *name;
  88
  89   /* What key is returned for this option.  If > 0 and printable, then it's
  90      also accepted as a short option.  */
  91   int key;
  92
  93   /* If non-NULL, this is the name of the argument associated with this
  94      option, which is required unless the OPTION_ARG_OPTIONAL flag is set. */
  95   __const char *arg;
  96
  97   /* OPTION_ flags.  */
  98   int flags;
  99
 100   /* The doc string for this option.  If both NAME and KEY are 0, This string
 101      will be printed outdented from the normal option column, making it
 102      useful as a group header (it will be the first thing printed in its
 103      group); in this usage, it's conventional to end the string with a `:'.  */
 104   __const char *doc;
 105
 106   /* The group this option is in.  In a long help message, options are sorted
 107      alphabetically within each group, and the groups presented in the order
 108      0, 1, 2, ..., n, -m, ..., -2, -1.  Every entry in an options array with
 109      if this field 0 will inherit the group number of the previous entry, or
 110      zero if it's the first one, unless its a group header (NAME and KEY both
 111      0), in which case, the previous entry + 1 is the default.  Automagic
 112      options such as --help are put into group -1.  */
 113   int group;
 114 };
 115
 116 /* The argument associated with this option is optional.  */
 117 #define OPTION_ARG_OPTIONAL     0x1
 118
 119 /* This option isn't displayed in any help messages.  */
 120 #define OPTION_HIDDEN           0x2
 121
 122 /* This option is an alias for the closest previous non-alias option.  This
 123    means that it will be displayed in the same help entry, and will inherit
 124    fields other than NAME and KEY from the aliased option.  */
 125 #define OPTION_ALIAS            0x4
 126
 127 /* This option isn't actually an option (and so should be ignored by the
 128    actual option parser), but rather an arbitrary piece of documentation that
 129    should be displayed in much the same manner as the options.  If this flag
 130    is set, then the option NAME field is displayed unmodified (e.g., no `--'
 131    prefix is added) at the left-margin (where a *short* option would normally
 132    be displayed), and the documentation string in the normal place.  For
 133    purposes of sorting, any leading whitespace and punctuation is ignored,
 134    except that if the first non-whitespace character is not `-', this entry
 135    is displayed after all options (and OPTION_DOC entries with a leading `-')
 136    in the same group.  */
 137 #define OPTION_DOC              0x8
 138
 139 /* This option shouldn't be included in `long' usage messages (but is still
 140    included in help messages).  This is mainly intended for options that are
 141    completely documented in an argp's ARGS_DOC field, in which case including
 142    the option in the generic usage list would be redundant.  For instance,
 143    if ARGS_DOC is "FOO BAR\n-x BLAH", and the `-x' option's purpose is to
 144    distinguish these two cases, -x should probably be marked
 145    OPTION_NO_USAGE.  */
 146 #define OPTION_NO_USAGE         0x10
 147 \f
 148 struct argp;                    /* fwd declare this type */
 149 struct argp_state;              /* " */
 150 struct argp_child;              /* " */
 151
 152 /* The type of a pointer to an argp parsing function.  */
 153 typedef error_t (*argp_parser_t) (int key, char *arg,
 154                                   struct argp_state *state);
 155
 156 /* What to return for unrecognized keys.  For special ARGP_KEY_ keys, such
 157    returns will simply be ignored.  For user keys, this error will be turned
 158    into EINVAL (if the call to argp_parse is such that errors are propagated
 159    back to the user instead of exiting); returning EINVAL itself would result
 160    in an immediate stop to parsing in *all* cases.  */
 161 #define ARGP_ERR_UNKNOWN        E2BIG /* Hurd should never need E2BIG.  XXX */
 162
 163 /* Special values for the KEY argument to an argument parsing function.
 164    ARGP_ERR_UNKNOWN should be returned if they aren't understood.
 165
 166    The sequence of keys to a parsing function is either (where each
 167    uppercased word should be prefixed by `ARGP_KEY_' and opt is a user key):
 168
 169        INIT opt... NO_ARGS END SUCCESS  -- No non-option arguments at all
 170    or  INIT (opt | ARG)... END SUCCESS  -- All non-option args parsed
 171    or  INIT (opt | ARG)... SUCCESS      -- Some non-option arg unrecognized
 172
 173    The third case is where every parser returned ARGP_KEY_UNKNOWN for an
 174    argument, in which case parsing stops at that argument (returning the
 175    unparsed arguments to the caller of argp_parse if requested, or stopping
 176    with an error message if not).
 177
 178    If an error occurs (either detected by argp, or because the parsing
 179    function returned an error value), then the parser is called with
 180    ARGP_KEY_ERROR, and no further calls are made.  */
 181
 182 /* This is not an option at all, but rather a command line argument.  If a
 183    parser receiving this key returns success, the fact is recorded, and the
 184    ARGP_KEY_NO_ARGS case won't be used.  HOWEVER, if while processing the
 185    argument, a parser function decrements the NEXT field of the state it's
 186    passed, the option won't be considered processed; this is to allow you to
 187    actually modify the argument (perhaps into an option), and have it
 188    processed again.  */
 189 #define ARGP_KEY_ARG            0
 190 /* There are remaining arguments not parsed by any parser, which may be found
 191    starting at (STATE->argv + STATE->next).  If success is returned, but
 192    STATE->next left untouched, it's assumed that all arguments were consume,
 193    otherwise, the parser should adjust STATE->next to reflect any arguments
 194    consumed.  */
 195 #define ARGP_KEY_ARGS           0x1000006
 196 /* There are no more command line arguments at all.  */
 197 #define ARGP_KEY_END            0x1000001
 198 /* Because it's common to want to do some special processing if there aren't
 199    any non-option args, user parsers are called with this key if they didn't
 200    successfully process any non-option arguments.  Called just before
 201    ARGP_KEY_END (where more general validity checks on previously parsed
 202    arguments can take place).  */
 203 #define ARGP_KEY_NO_ARGS        0x1000002
 204 /* Passed in before any parsing is done.  Afterwards, the values of each
 205    element of the CHILD_INPUT field, if any, in the state structure is
 206    copied to each child's state to be the initial value of the INPUT field.  */
 207 #define ARGP_KEY_INIT           0x1000003
 208 /* Use after all other keys, including SUCCESS & END.  */
 209 #define ARGP_KEY_FINI           0x1000007
 210 /* Passed in when parsing has successfully been completed (even if there are
 211    still arguments remaining).  */
 212 #define ARGP_KEY_SUCCESS        0x1000004
 213 /* Passed in if an error occurs.  */
 214 #define ARGP_KEY_ERROR          0x1000005
 215
 216 /* An argp structure contains a set of options declarations, a function to
 217    deal with parsing one, documentation string, a possible vector of child
 218    argp's, and perhaps a function to filter help output.  When actually
 219    parsing options, getopt is called with the union of all the argp
 220    structures chained together through their CHILD pointers, with conflicts
 221    being resolved in favor of the first occurrence in the chain.  */
 222 struct argp
 223 {
 224   /* An array of argp_option structures, terminated by an entry with both
 225      NAME and KEY having a value of 0.  */
 226   __const struct argp_option *options;
 227
 228   /* What to do with an option from this structure.  KEY is the key
 229      associated with the option, and ARG is any associated argument (NULL if
 230      none was supplied).  If KEY isn't understood, ARGP_ERR_UNKNOWN should be
 231      returned.  If a non-zero, non-ARGP_ERR_UNKNOWN value is returned, then
 232      parsing is stopped immediately, and that value is returned from
 233      argp_parse().  For special (non-user-supplied) values of KEY, see the
 234      ARGP_KEY_ definitions below.  */
 235   argp_parser_t parser;
 236
 237   /* A string describing what other arguments are wanted by this program.  It
 238      is only used by argp_usage to print the `Usage:' message.  If it
 239      contains newlines, the strings separated by them are considered
 240      alternative usage patterns, and printed on separate lines (lines after
 241      the first are prefix by `  or: ' instead of `Usage:').  */
 242   __const char *args_doc;
 243
 244   /* If non-NULL, a string containing extra text to be printed before and
 245      after the options in a long help message (separated by a vertical tab
 246      `\v' character).  */
 247   __const char *doc;
 248
 249   /* A vector of argp_children structures, terminated by a member with a 0
 250      argp field, pointing to child argps should be parsed with this one.  Any
 251      conflicts are resolved in favor of this argp, or early argps in the
 252      CHILDREN list.  This field is useful if you use libraries that supply
 253      their own argp structure, which you want to use in conjunction with your
 254      own.  */
 255   __const struct argp_child *children;
 256
 257   /* If non-zero, this should be a function to filter the output of help
 258      messages.  KEY is either a key from an option, in which case TEXT is
 259      that option's help text, or a special key from the ARGP_KEY_HELP_
 260      defines, below, describing which other help text TEXT is.  The function
 261      should return either TEXT, if it should be used as-is, a replacement
 262      string, which should be malloced, and will be freed by argp, or NULL,
 263      meaning `print nothing'.  The value for TEXT is *after* any translation
 264      has been done, so if any of the replacement text also needs translation,
 265      that should be done by the filter function.  INPUT is either the input
 266      supplied to argp_parse, or NULL, if argp_help was called directly.  */
 267   char *(*help_filter) (int __key, __const char *__text, void *__input);
 268
 269   /* If non-zero the strings used in the argp library are translated using
 270      the domain described by this string.  Otherwise the currently installed
 271      default domain is used.  */
 272   const char *argp_domain;
 273 };
 274
 275 /* Possible KEY arguments to a help filter function.  */
 276 #define ARGP_KEY_HELP_PRE_DOC   0x2000001 /* Help text preceeding options. */
 277 #define ARGP_KEY_HELP_POST_DOC  0x2000002 /* Help text following options. */
 278 #define ARGP_KEY_HELP_HEADER    0x2000003 /* Option header string. */
 279 #define ARGP_KEY_HELP_EXTRA     0x2000004 /* After all other documentation;
 280                                              TEXT is NULL for this key.  */
 281 /* Explanatory note emitted when duplicate option arguments have been
 282    suppressed.  */
 283 #define ARGP_KEY_HELP_DUP_ARGS_NOTE 0x2000005
 284 #define ARGP_KEY_HELP_ARGS_DOC  0x2000006 /* Argument doc string.  */
 285 \f
 286 /* When an argp has a non-zero CHILDREN field, it should point to a vector of
 287    argp_child structures, each of which describes a subsidiary argp.  */
 288 struct argp_child
 289 {
 290   /* The child parser.  */
 291   __const struct argp *argp;
 292
 293   /* Flags for this child.  */
 294   int flags;
 295
 296   /* If non-zero, an optional header to be printed in help output before the
 297      child options.  As a side-effect, a non-zero value forces the child
 298      options to be grouped together; to achieve this effect without actually
 299      printing a header string, use a value of "".  */
 300   __const char *header;
 301
 302   /* Where to group the child options relative to the other (`consolidated')
 303      options in the parent argp; the values are the same as the GROUP field
 304      in argp_option structs, but all child-groupings follow parent options at
 305      a particular group level.  If both this field and HEADER are zero, then
 306      they aren't grouped at all, but rather merged with the parent options
 307      (merging the child's grouping levels with the parents).  */
 308   int group;
 309 };
 310 \f
 311 /* Parsing state.  This is provided to parsing functions called by argp,
 312    which may examine and, as noted, modify fields.  */
 313 struct argp_state
 314 {
 315   /* The top level ARGP being parsed.  */
 316   __const struct argp *root_argp;
 317
 318   /* The argument vector being parsed.  May be modified.  */
 319   int argc;
 320   char **argv;
 321
 322   /* The index in ARGV of the next arg that to be parsed.  May be modified. */
 323   int next;
 324
 325   /* The flags supplied to argp_parse.  May be modified.  */
 326   unsigned flags;
 327
 328   /* While calling a parsing function with a key of ARGP_KEY_ARG, this is the
 329      number of the current arg, starting at zero, and incremented after each
 330      such call returns.  At all other times, this is the number of such
 331      arguments that have been processed.  */
 332   unsigned arg_num;
 333
 334   /* If non-zero, the index in ARGV of the first argument following a special
 335      `--' argument (which prevents anything following being interpreted as an
 336      option).  Only set once argument parsing has proceeded past this point. */
 337   int quoted;
 338
 339   /* An arbitrary pointer passed in from the user.  */
 340   void *input;
 341   /* Values to pass to child parsers.  This vector will be the same length as
 342      the number of children for the current parser.  */
 343   void **child_inputs;
 344
 345   /* For the parser's use.  Initialized to 0.  */
 346   void *hook;
 347
 348   /* The name used when printing messages.  This is initialized to ARGV[0],
 349      or PROGRAM_INVOCATION_NAME if that is unavailable.  */
 350   char *name;
 351
 352   /* Streams used when argp prints something.  */
 353   FILE *err_stream;             /* For errors; initialized to stderr. */
 354   FILE *out_stream;             /* For information; initialized to stdout. */
 355
 356   void *pstate;                 /* Private, for use by argp.  */
 357 };
 358 \f
 359 /* Flags for argp_parse (note that the defaults are those that are
 360    convenient for program command line parsing): */
 361
 362 /* Don't ignore the first element of ARGV.  Normally (and always unless
 363    ARGP_NO_ERRS is set) the first element of the argument vector is
 364    skipped for option parsing purposes, as it corresponds to the program name
 365    in a command line.  */
 366 #define ARGP_PARSE_ARGV0  0x01
 367
 368 /* Don't print error messages for unknown options to stderr; unless this flag
 369    is set, ARGP_PARSE_ARGV0 is ignored, as ARGV[0] is used as the program
 370    name in the error messages.  This flag implies ARGP_NO_EXIT (on the
 371    assumption that silent exiting upon errors is bad behaviour).  */
 372 #define ARGP_NO_ERRS    0x02
 373
 374 /* Don't parse any non-option args.  Normally non-option args are parsed by
 375    calling the parse functions with a key of ARGP_KEY_ARG, and the actual arg
 376    as the value.  Since it's impossible to know which parse function wants to
 377    handle it, each one is called in turn, until one returns 0 or an error
 378    other than ARGP_ERR_UNKNOWN; if an argument is handled by no one, the
 379    argp_parse returns prematurely (but with a return value of 0).  If all
 380    args have been parsed without error, all parsing functions are called one
 381    last time with a key of ARGP_KEY_END.  This flag needn't normally be set,
 382    as the normal behavior is to stop parsing as soon as some argument can't
 383    be handled.  */
 384 #define ARGP_NO_ARGS    0x04
 385
 386 /* Parse options and arguments in the same order they occur on the command
 387    line -- normally they're rearranged so that all options come first. */
 388 #define ARGP_IN_ORDER   0x08
 389
 390 /* Don't provide the standard long option --help, which causes usage and
 391       option help information to be output to stdout, and exit (0) called. */
 392 #define ARGP_NO_HELP    0x10
 393
 394 /* Don't exit on errors (they may still result in error messages).  */
 395 #define ARGP_NO_EXIT    0x20
 396
 397 /* Use the gnu getopt `long-only' rules for parsing arguments.  */
 398 #define ARGP_LONG_ONLY  0x40
 399
 400 /* Turns off any message-printing/exiting options.  */
 401 #define ARGP_SILENT    (ARGP_NO_EXIT | ARGP_NO_ERRS | ARGP_NO_HELP)
 402
 403 /* Parse the options strings in ARGC & ARGV according to the options in ARGP.
 404    FLAGS is one of the ARGP_ flags above.  If ARG_INDEX is non-NULL, the
 405    index in ARGV of the first unparsed option is returned in it.  If an
 406    unknown option is present, ARGP_ERR_UNKNOWN is returned; if some parser
 407    routine returned a non-zero value, it is returned; otherwise 0 is
 408    returned.  This function may also call exit unless the ARGP_NO_HELP flag
 409    is set.  INPUT is a pointer to a value to be passed in to the parser.  */
 410 extern error_t argp_parse (__const struct argp *__restrict __argp,
 411                            int __argc, char **__restrict __argv,
 412                            unsigned __flags, int *__restrict __arg_index,
 413                            void *__restrict __input);
 414 extern error_t __argp_parse (__const struct argp *__restrict __argp,
 415                              int __argc, char **__restrict __argv,
 416                              unsigned __flags, int *__restrict __arg_index,
 417                              void *__restrict __input);
 418 \f
 419 /* Global variables.  */
 420
 421 /* If defined or set by the user program to a non-zero value, then a default
 422    option --version is added (unless the ARGP_NO_HELP flag is used), which
 423    will print this string followed by a newline and exit (unless the
 424    ARGP_NO_EXIT flag is used).  Overridden by ARGP_PROGRAM_VERSION_HOOK.  */
 425 extern __const char *argp_program_version;
 426
 427 /* If defined or set by the user program to a non-zero value, then a default
 428    option --version is added (unless the ARGP_NO_HELP flag is used), which
 429    calls this function with a stream to print the version to and a pointer to
 430    the current parsing state, and then exits (unless the ARGP_NO_EXIT flag is
 431    used).  This variable takes precedent over ARGP_PROGRAM_VERSION.  */
 432 extern void (*argp_program_version_hook) (FILE *__restrict __stream,
 433                                           struct argp_state *__restrict
 434                                           __state);
 435
 436 /* If defined or set by the user program, it should point to string that is
 437    the bug-reporting address for the program.  It will be printed by
 438    argp_help if the ARGP_HELP_BUG_ADDR flag is set (as it is by various
 439    standard help messages), embedded in a sentence that says something like
 440    `Report bugs to ADDR.'.  */
 441 extern __const char *argp_program_bug_address;
 442
 443 /* The exit status that argp will use when exiting due to a parsing error.
 444    If not defined or set by the user program, this defaults to EX_USAGE from
 445    <sysexits.h>.  */
 446 extern error_t argp_err_exit_status;
 447 \f
 448 /* Flags for argp_help.  */
 449 #define ARGP_HELP_USAGE         0x01 /* a Usage: message. */
 450 #define ARGP_HELP_SHORT_USAGE   0x02 /*  " but don't actually print options. */
 451 #define ARGP_HELP_SEE           0x04 /* a `Try ... for more help' message. */
 452 #define ARGP_HELP_LONG          0x08 /* a long help message. */
 453 #define ARGP_HELP_PRE_DOC       0x10 /* doc string preceding long help.  */
 454 #define ARGP_HELP_POST_DOC      0x20 /* doc string following long help.  */
 455 #define ARGP_HELP_DOC           (ARGP_HELP_PRE_DOC | ARGP_HELP_POST_DOC)
 456 #define ARGP_HELP_BUG_ADDR      0x40 /* bug report address */
 457 #define ARGP_HELP_LONG_ONLY     0x80 /* modify output appropriately to
 458                                         reflect ARGP_LONG_ONLY mode.  */
 459
 460 /* These ARGP_HELP flags are only understood by argp_state_help.  */
 461 #define ARGP_HELP_EXIT_ERR      0x100 /* Call exit(1) instead of returning.  */
 462 #define ARGP_HELP_EXIT_OK       0x200 /* Call exit(0) instead of returning.  */
 463
 464 /* The standard thing to do after a program command line parsing error, if an
 465    error message has already been printed.  */
 466 #define ARGP_HELP_STD_ERR \
 467   (ARGP_HELP_SEE | ARGP_HELP_EXIT_ERR)
 468 /* The standard thing to do after a program command line parsing error, if no
 469    more specific error message has been printed.  */
 470 #define ARGP_HELP_STD_USAGE \
 471   (ARGP_HELP_SHORT_USAGE | ARGP_HELP_SEE | ARGP_HELP_EXIT_ERR)
 472 /* The standard thing to do in response to a --help option.  */
 473 #define ARGP_HELP_STD_HELP \
 474   (ARGP_HELP_SHORT_USAGE | ARGP_HELP_LONG | ARGP_HELP_EXIT_OK \
 475    | ARGP_HELP_DOC | ARGP_HELP_BUG_ADDR)
 476
 477 /* Output a usage message for ARGP to STREAM.  FLAGS are from the set
 478    ARGP_HELP_*.  */
 479 extern void argp_help (__const struct argp *__restrict __argp,
 480                        FILE *__restrict __stream,
 481                        unsigned __flags, char *__restrict __name);
 482 extern void __argp_help (__const struct argp *__restrict __argp,
 483                          FILE *__restrict __stream, unsigned __flags,
 484                          char *__name);
 485 \f
 486 /* The following routines are intended to be called from within an argp
 487    parsing routine (thus taking an argp_state structure as the first
 488    argument).  They may or may not print an error message and exit, depending
 489    on the flags in STATE -- in any case, the caller should be prepared for
 490    them *not* to exit, and should return an appropiate error after calling
 491    them.  [argp_usage & argp_error should probably be called argp_state_...,
 492    but they're used often enough that they should be short]  */
 493
 494 /* Output, if appropriate, a usage message for STATE to STREAM.  FLAGS are
 495    from the set ARGP_HELP_*.  */
 496 extern void argp_state_help (__const struct argp_state *__restrict __state,
 497                              FILE *__restrict __stream,
 498                              unsigned int __flags);
 499 extern void __argp_state_help (__const struct argp_state *__restrict __state,
 500                                FILE *__restrict __stream,
 501                                unsigned int __flags);
 502
 503 /* Possibly output the standard usage message for ARGP to stderr and exit.  */
 504 extern void argp_usage (__const struct argp_state *__state);
 505 extern void __argp_usage (__const struct argp_state *__state);
 506
 507 /* If appropriate, print the printf string FMT and following args, preceded
 508    by the program name and `:', to stderr, and followed by a `Try ... --help'
 509    message, then exit (1).  */
 510 extern void argp_error (__const struct argp_state *__restrict __state,
 511                         __const char *__restrict __fmt, ...)
 512      __attribute__ ((__format__ (__printf__, 2, 3)));
 513 extern void __argp_error (__const struct argp_state *__restrict __state,
 514                           __const char *__restrict __fmt, ...)
 515      __attribute__ ((__format__ (__printf__, 2, 3)));
 516
 517 /* Similar to the standard gnu error-reporting function error(), but will
 518    respect the ARGP_NO_EXIT and ARGP_NO_ERRS flags in STATE, and will print
 519    to STATE->err_stream.  This is useful for argument parsing code that is
 520    shared between program startup (when exiting is desired) and runtime
 521    option parsing (when typically an error code is returned instead).  The
 522    difference between this function and argp_error is that the latter is for
 523    *parsing errors*, and the former is for other problems that occur during
 524    parsing but don't reflect a (syntactic) problem with the input.  */
 525 extern void argp_failure (__const struct argp_state *__restrict __state,
 526                           int __status, int __errnum,
 527                           __const char *__restrict __fmt, ...)
 528      __attribute__ ((__format__ (__printf__, 4, 5)));
 529 extern void __argp_failure (__const struct argp_state *__restrict __state,
 530                             int __status, int __errnum,
 531                             __const char *__restrict __fmt, ...)
 532      __attribute__ ((__format__ (__printf__, 4, 5)));
 533
 534 /* Returns true if the option OPT is a valid short option.  */
 535 extern int _option_is_short (__const struct argp_option *__opt) __THROW;
 536 extern int __option_is_short (__const struct argp_option *__opt) __THROW;
 537
 538 /* Returns true if the option OPT is in fact the last (unused) entry in an
 539    options array.  */
 540 extern int _option_is_end (__const struct argp_option *__opt) __THROW;
 541 extern int __option_is_end (__const struct argp_option *__opt) __THROW;
 542
 543 /* Return the input field for ARGP in the parser corresponding to STATE; used
 544    by the help routines.  */
 545 extern void *_argp_input (__const struct argp *__restrict __argp,
 546                           __const struct argp_state *__restrict __state)
 547      __THROW;
 548 extern void *__argp_input (__const struct argp *__restrict __argp,
 549                            __const struct argp_state *__restrict __state)
 550      __THROW;
 551 \f
 552 #ifdef __USE_EXTERN_INLINES
 553
 554 # if !_LIBC
 555 #  define __argp_usage argp_usage
 556 #  define __argp_state_help argp_state_help
 557 #  define __option_is_short _option_is_short
 558 #  define __option_is_end _option_is_end
 559 # endif
 560
 561 # ifndef ARGP_EI
 562 #  define ARGP_EI __extern_inline
 563 # endif
 564
 565 ARGP_EI void
 566 __argp_usage (__const struct argp_state *__state)
 567 {
 568   __argp_state_help (__state, stderr, ARGP_HELP_STD_USAGE);
 569 }
 570
 571 ARGP_EI int
 572 __NTH (__option_is_short (__const struct argp_option *__opt))
 573 {
 574   if (__opt->flags & OPTION_DOC)
 575     return 0;
 576   else
 577     {
 578       int __key = __opt->key;
 579       return __key > 0 && __key <= UCHAR_MAX && isprint (__key);
 580     }
 581 }
 582
 583 ARGP_EI int
 584 __NTH (__option_is_end (__const struct argp_option *__opt))
 585 {
 586   return !__opt->key && !__opt->name && !__opt->doc && !__opt->group;
 587 }
 588
 589 # if !_LIBC
 590 #  undef __argp_usage
 591 #  undef __argp_state_help
 592 #  undef __option_is_short
 593 #  undef __option_is_end
 594 # endif
 595 #endif /* Use extern inlines.  */
 596
 597 #ifdef  __cplusplus
 598 }
 599 #endif
 600
 601 #endif /* argp.h */