+++ /dev/null
-/* argmatch.c -- find a match for a string in an array
-
- Copyright (C) 1990, 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007
- 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 3 of the License, 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, see <http://www.gnu.org/licenses/>. */
-
-/* Written by David MacKenzie <djm@ai.mit.edu>
- Modified by Akim Demaille <demaille@inf.enst.fr> */
-
-#include <config.h>
-
-/* Specification. */
-#include "argmatch.h"
-
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "gettext.h"
-#define _(msgid) gettext (msgid)
-
-#include "error.h"
-#include "quotearg.h"
-#include "quote.h"
-
-#if USE_UNLOCKED_IO
-# include "unlocked-io.h"
-#endif
-
-/* When reporting an invalid argument, show nonprinting characters
- by using the quoting style ARGMATCH_QUOTING_STYLE. Do not use
- literal_quoting_style. */
-#ifndef ARGMATCH_QUOTING_STYLE
-# define ARGMATCH_QUOTING_STYLE locale_quoting_style
-#endif
-
-/* Non failing version of argmatch call this function after failing. */
-#ifndef ARGMATCH_DIE
-# include "exitfail.h"
-# define ARGMATCH_DIE exit (exit_failure)
-#endif
-
-#ifdef ARGMATCH_DIE_DECL
-ARGMATCH_DIE_DECL;
-#endif
-
-static void
-__argmatch_die (void)
-{
- 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;
-
-\f
-/* 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'. */
-
-ptrdiff_t
-argmatch (const char *arg, const char *const *arglist,
- const char *vallist, size_t valsize)
-{
- size_t i; /* Temporary index in ARGLIST. */
- size_t arglen; /* Length of ARG. */
- ptrdiff_t matchind = -1; /* Index of first nonexact match. */
- bool ambiguous = false; /* If true, 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 = true;
- }
- }
- }
- }
- 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 (const char *context, const char *value, ptrdiff_t problem)
-{
- char const *format = (problem == -1
- ? _("invalid argument %s for %s")
- : _("ambiguous argument %s for %s"));
-
- error (0, 0, format, quotearg_n_style (0, ARGMATCH_QUOTING_STYLE, value),
- quote_n (1, 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 (const char *const *arglist,
- const char *vallist, size_t valsize)
-{
- size_t 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. */
-
-ptrdiff_t
-__xargmatch_internal (const char *context,
- const char *arg, const char *const *arglist,
- const char *vallist, size_t valsize,
- argmatch_exit_fn exit_fn)
-{
- ptrdiff_t 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 (const char *value,
- const char *const *arglist,
- const char *vallist, size_t valsize)
-{
- size_t i;
-
- for (i = 0; arglist[i]; i++)
- if (!memcmp (value, vallist + valsize * i, valsize))
- return arglist[i];
- return NULL;
-}
-
-#ifdef TEST
-/*
- * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
- */
-char *program_name;
-
-/* When to make backup files. */
-enum backup_type
-{
- /* Never make backups. */
- no_backups,
-
- /* Make simple backups of every file. */
- simple_backups,
-
- /* Make numbered backups of files that already have numbered backups,
- and simple backups of the others. */
- numbered_existing_backups,
-
- /* Make numbered backups of every file. */
- numbered_backups
-};
-
-/* Two tables describing arguments (keys) and their corresponding
- values */
-static const char *const backup_args[] =
-{
- "no", "none", "off",
- "simple", "never",
- "existing", "nil",
- "numbered", "t",
- 0
-};
-
-static const enum backup_type backup_vals[] =
-{
- no_backups, no_backups, no_backups,
- simple_backups, simple_backups,
- numbered_existing_backups, numbered_existing_backups,
- numbered_backups, numbered_backups
-};
-
-int
-main (int argc, const char *const *argv)
-{
- const char *cp;
- enum backup_type backup_type = no_backups;
-
- program_name = (char *) argv[0];
-
- if (argc > 2)
- {
- fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
- exit (1);
- }
-
- if ((cp = getenv ("VERSION_CONTROL")))
- backup_type = XARGMATCH ("$VERSION_CONTROL", cp,
- backup_args, backup_vals);
-
- if (argc == 2)
- backup_type = XARGMATCH (program_name, argv[1],
- backup_args, backup_vals);
-
- printf ("The version control is `%s'\n",
- ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));
-
- return 0;
-}
-#endif
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