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/* argmatch.c -- find a match for a string in an array
Copyright (C) 1990, 1998, 1999, 2001 Free Software Foundation, Inc.
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, 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. */
/* Written by David MacKenzie <djm@ai.mit.edu>
Modified by Akim Demaille <demaille@inf.enst.fr> */
#include "argmatch.h"
#include <stdio.h>
#include <stdlib.h>
#ifdef STDC_HEADERS
# include <string.h>
#endif
#include <locale.h>
#if ENABLE_NLS
# include <libintl.h>
# define _(Text) gettext (Text)
#else
# define _(Text) Text
#endif
#include "error.h"
/* The following test is to work around the gross typo in
systems like Sony NEWS-OS Release 4.0C, whereby EXIT_FAILURE
is defined to 0, not 1. */
#if !EXIT_FAILURE
# undef EXIT_FAILURE
# define EXIT_FAILURE 1
#endif
/* Non failing version of argmatch call this function after failing. */
#ifndef ARGMATCH_DIE
# define ARGMATCH_DIE exit (EXIT_FAILURE)
#endif
#ifdef ARGMATCH_DIE_DECL
ARGMATCH_DIE_DECL;
#endif
/* Prototypes for local functions. Needed to ensure compiler checking of
function argument counts despite of K&R C function definition syntax. */
static void __argmatch_die PARAMS ((void));
static void
__argmatch_die ()
{
ARGMATCH_DIE;
}
/* Used by XARGMATCH and XARGCASEMATCH. See description in argmatch.h.
Default to __argmatch_die, but allow caller to change this at run-time. */
argmatch_exit_fn argmatch_die = __argmatch_die;
/* If ARG is an unambiguous match for an element of the
null-terminated array ARGLIST, return the index in ARGLIST
of the matched element, else -1 if it does not match any element
or -2 if it is ambiguous (is a prefix of more than one element).
If VALLIST is none null, use it to resolve ambiguities limited to
synonyms, i.e., for
"yes", "yop" -> 0
"no", "nope" -> 1
"y" is a valid argument, for `0', and "n" for `1'. */
int
argmatch (arg, arglist, vallist, valsize)
const char *arg;
const char *const *arglist;
const char *vallist;
size_t valsize;
{
int i; /* Temporary index in ARGLIST. */
size_t arglen; /* Length of ARG. */
int matchind = -1; /* Index of first nonexact match. */
int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
arglen = strlen (arg);
/* Test all elements for either exact match or abbreviated matches. */
for (i = 0; arglist[i]; i++)
{
if (!strncmp (arglist[i], arg, arglen))
{
if (strlen (arglist[i]) == arglen)
/* Exact match found. */
return i;
else if (matchind == -1)
/* First nonexact match found. */
matchind = i;
else
{
/* Second nonexact match found. */
if (vallist == NULL
|| memcmp (vallist + valsize * matchind,
vallist + valsize * i, valsize))
{
/* There is a real ambiguity, or we could not
disambiguate. */
ambiguous = 1;
}
}
}
}
if (ambiguous)
return -2;
else
return matchind;
}
/* Error reporting for argmatch.
CONTEXT is a description of the type of entity that was being matched.
VALUE is the invalid value that was given.
PROBLEM is the return value from argmatch. */
void
argmatch_invalid (context, value, problem)
const char *context;
const char *value;
int problem;
{
char const *format = (problem == -1
? _("invalid argument `%s' for `%s'")
: _("ambiguous argument `%s' for `%s'"));
error (0, 0, format, value, context);
}
/* List the valid arguments for argmatch.
ARGLIST is the same as in argmatch.
VALLIST is a pointer to an array of values.
VALSIZE is the size of the elements of VALLIST */
void
argmatch_valid (arglist, vallist, valsize)
const char *const *arglist;
const char *vallist;
size_t valsize;
{
int i;
const char *last_val = NULL;
/* We try to put synonyms on the same line. The assumption is that
synonyms follow each other */
fprintf (stderr, _("Valid arguments are:"));
for (i = 0; arglist[i]; i++)
if ((i == 0)
|| memcmp (last_val, vallist + valsize * i, valsize))
{
fprintf (stderr, "\n - `%s'", arglist[i]);
last_val = vallist + valsize * i;
}
else
{
fprintf (stderr, ", `%s'", arglist[i]);
}
putc ('\n', stderr);
}
/* Never failing versions of the previous functions.
CONTEXT is the context for which argmatch is called (e.g.,
"--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
calls the (supposed never to return) function EXIT_FN. */
int
__xargmatch_internal (context, arg, arglist, vallist, valsize, exit_fn)
const char *context;
const char *arg;
const char *const *arglist;
const char *vallist;
size_t valsize;
argmatch_exit_fn exit_fn;
{
int res = argmatch (arg, arglist, vallist, valsize);
if (res >= 0)
/* Success. */
return res;
/* We failed. Explain why. */
argmatch_invalid (context, arg, res);
argmatch_valid (arglist, vallist, valsize);
(*exit_fn) ();
return -1; /* To please the compilers. */
}
/* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
return the first corresponding argument in ARGLIST */
const char *
argmatch_to_argument (value, arglist, vallist, valsize)
const char *value;
const char *const *arglist;
const char *vallist;
size_t valsize;
{
int i;
for (i = 0; arglist[i]; i++)
if (!memcmp (value, vallist + valsize * i, valsize))
return arglist[i];
return NULL;
}
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