lib/argmatch.h

   1 /* argmatch.h -- definitions and prototypes for argmatch.c
   2    Copyright (C) 1990, 1998, 1999 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Written by David MacKenzie <djm@ai.mit.edu>
  19    Modified by Akim Demaille <demaille@inf.enst.fr> */
  20
  21 #ifndef ARGMATCH_H_
  22 # define ARGMATCH_H_ 1
  23
  24 # if HAVE_CONFIG_H
  25 #  include <config.h>
  26 # endif
  27
  28 # include <sys/types.h>
  29
  30 # ifndef PARAMS
  31 #  if PROTOTYPES || (defined (__STDC__) && __STDC__)
  32 #   define PARAMS(args) args
  33 #  else
  34 #   define PARAMS(args) ()
  35 #  endif  /* GCC.  */
  36 # endif  /* Not PARAMS.  */
  37
  38 /* Assert there are as many real arguments as there are values
  39    (argument list ends with a NULL guard).  There is no execution
  40    cost, since it will be statically evalauted to `assert (0)' or
  41    `assert (1)'.  Unfortunately there is no -Wassert-0. */
  42
  43 # undef ARRAY_CARDINALITY
  44 # define ARRAY_CARDINALITY(Array) (sizeof ((Array)) / sizeof (*(Array)))
  45
  46 # define ARGMATCH_ASSERT(Arglist, Vallist)      \
  47   assert (ARRAY_CARDINALITY ((Arglist)) == ARRAY_CARDINALITY ((Vallist)) + 1)
  48
  49 /* Return the index of the element of ARGLIST (NULL terminated) that
  50    matches with ARG.  If VALLIST is not NULL, then use it to resolve
  51    false ambiguities (i.e., different matches of ARG but corresponding
  52    to the same values in VALLIST).  */
  53
  54 int argmatch
  55   PARAMS ((const char *arg, const char *const *arglist,
  56            const char *vallist, size_t valsize));
  57 int argcasematch
  58   PARAMS ((const char *arg, const char *const *arglist,
  59            const char *vallist, size_t valsize));
  60
  61 # define ARGMATCH(Arg, Arglist, Vallist) \
  62   argmatch ((Arg), (Arglist), (const char *) (Vallist), sizeof (*(Vallist)))
  63
  64 # define ARGCASEMATCH(Arg, Arglist, Vallist) \
  65   argcasematch ((Arg), (Arglist), (const char *) (Vallist), sizeof (*(Vallist)))
  66
  67 /* xargmatch calls this function when it fails.  This function should not
  68    return.  By default, this is a function that calls ARGMATCH_DIE which
  69    in turn defaults to `exit (EXIT_FAILURE)'.  */
  70 typedef void (*argmatch_exit_fn) PARAMS ((void));
  71 extern argmatch_exit_fn argmatch_die;
  72
  73 /* Report on stderr why argmatch failed.  Report correct values. */
  74
  75 void argmatch_invalid
  76   PARAMS ((const char *context, const char *value, int problem));
  77
  78 /* Left for compatibility with the old name invalid_arg */
  79
  80 # define invalid_arg(Context, Value, Problem) \
  81   argmatch_invalid ((Context), (Value), (Problem))
  82
  83
  84
  85 /* Report on stderr the list of possible arguments.  */
  86
  87 void argmatch_valid
  88   PARAMS ((const char *const *arglist,
  89            const char *vallist, size_t valsize));
  90
  91 # define ARGMATCH_VALID(Arglist, Vallist) \
  92   argmatch_valid (Arglist, (const char *) Vallist, sizeof (*(Vallist)))
  93
  94
  95
  96 /* Same as argmatch, but upon failure, reports a explanation on the
  97    failure, and exits using the function EXIT_FN. */
  98
  99 int __xargmatch_internal
 100   PARAMS ((const char *context,
 101            const char *arg, const char *const *arglist,
 102            const char *vallist, size_t valsize,
 103            int case_sensitive, argmatch_exit_fn exit_fn));
 104
 105 /* Programmer friendly interface to __xargmatch_internal. */
 106
 107 # define XARGMATCH(Context, Arg, Arglist, Vallist)                      \
 108   (Vallist [__xargmatch_internal ((Context), (Arg), (Arglist),  \
 109                                   (const char *) (Vallist),     \
 110                                   sizeof (*(Vallist)),          \
 111                                   1, argmatch_die)])
 112
 113 # define XARGCASEMATCH(Context, Arg, Arglist, Vallist)          \
 114   (Vallist [__xargmatch_internal ((Context), (Arg), (Arglist),  \
 115                                   (const char *) (Vallist),     \
 116                                   sizeof (*(Vallist)),          \
 117                                   0, argmatch_die)])
 118
 119 /* Convert a value into a corresponding argument. */
 120
 121 const char *argmatch_to_argument
 122   PARAMS ((char const *value, const char *const *arglist,
 123            const char *vallist, size_t valsize));
 124
 125 # define ARGMATCH_TO_ARGUMENT(Value, Arglist, Vallist)                  \
 126   argmatch_to_argument ((char const *) &(Value), (Arglist),             \
 127                         (const char *) (Vallist), sizeof (*(Vallist)))
 128
 129 #endif /* ARGMATCH_H_ */