310 lines
8.0 KiB
C
310 lines
8.0 KiB
C
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/* argmatch.c -- find a match for a string in an array
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Copyright (C) 1990, 1998, 1999, 2001 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by David MacKenzie <djm@ai.mit.edu>
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Modified by Akim Demaille <demaille@inf.enst.fr> */
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#include "argmatch.h"
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#include <stdio.h>
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#ifdef STDC_HEADERS
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# include <string.h>
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#endif
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#if HAVE_LOCALE_H
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# include <locale.h>
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#endif
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#if ENABLE_NLS
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# include <libintl.h>
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# define _(Text) gettext (Text)
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#else
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# define _(Text) Text
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#endif
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#include "error.h"
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#include "quotearg.h"
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#include "quote.h"
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#include "unlocked-io.h"
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/* When reporting an invalid argument, show nonprinting characters
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by using the quoting style ARGMATCH_QUOTING_STYLE. Do not use
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literal_quoting_style. */
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#ifndef ARGMATCH_QUOTING_STYLE
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# define ARGMATCH_QUOTING_STYLE locale_quoting_style
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#endif
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/* The following test is to work around the gross typo in
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systems like Sony NEWS-OS Release 4.0C, whereby EXIT_FAILURE
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is defined to 0, not 1. */
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#if !EXIT_FAILURE
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# undef EXIT_FAILURE
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# define EXIT_FAILURE 1
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#endif
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/* Non failing version of argmatch call this function after failing. */
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#ifndef ARGMATCH_DIE
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# define ARGMATCH_DIE exit (EXIT_FAILURE)
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#endif
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#ifdef ARGMATCH_DIE_DECL
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ARGMATCH_DIE_DECL;
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#endif
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static void
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__argmatch_die (void)
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{
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ARGMATCH_DIE;
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}
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/* Used by XARGMATCH and XARGCASEMATCH. See description in argmatch.h.
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Default to __argmatch_die, but allow caller to change this at run-time. */
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argmatch_exit_fn argmatch_die = __argmatch_die;
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/* If ARG is an unambiguous match for an element of the
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null-terminated array ARGLIST, return the index in ARGLIST
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of the matched element, else -1 if it does not match any element
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or -2 if it is ambiguous (is a prefix of more than one element).
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If SENSITIVE, comparison is case sensitive.
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If VALLIST is none null, use it to resolve ambiguities limited to
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synonyms, i.e., for
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"yes", "yop" -> 0
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"no", "nope" -> 1
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"y" is a valid argument, for `0', and "n" for `1'. */
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static int
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__argmatch_internal (const char *arg, const char *const *arglist,
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const char *vallist, size_t valsize,
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int case_sensitive)
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{
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int i; /* Temporary index in ARGLIST. */
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size_t arglen; /* Length of ARG. */
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int matchind = -1; /* Index of first nonexact match. */
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int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
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arglen = strlen (arg);
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/* Test all elements for either exact match or abbreviated matches. */
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for (i = 0; arglist[i]; i++)
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{
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if (case_sensitive
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? !strncmp (arglist[i], arg, arglen)
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: !strncasecmp (arglist[i], arg, arglen))
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{
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if (strlen (arglist[i]) == arglen)
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/* Exact match found. */
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return i;
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else if (matchind == -1)
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/* First nonexact match found. */
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matchind = i;
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else
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{
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/* Second nonexact match found. */
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if (vallist == NULL
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|| memcmp (vallist + valsize * matchind,
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vallist + valsize * i, valsize))
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{
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/* There is a real ambiguity, or we could not
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disambiguate. */
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ambiguous = 1;
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}
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}
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}
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}
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if (ambiguous)
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return -2;
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else
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return matchind;
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}
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/* argmatch - case sensitive version */
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int
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argmatch (const char *arg, const char *const *arglist,
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const char *vallist, size_t valsize)
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{
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return __argmatch_internal (arg, arglist, vallist, valsize, 1);
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}
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/* argcasematch - case insensitive version */
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int
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argcasematch (const char *arg, const char *const *arglist,
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const char *vallist, size_t valsize)
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{
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return __argmatch_internal (arg, arglist, vallist, valsize, 0);
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}
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/* Error reporting for argmatch.
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CONTEXT is a description of the type of entity that was being matched.
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VALUE is the invalid value that was given.
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PROBLEM is the return value from argmatch. */
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void
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argmatch_invalid (const char *context, const char *value, int problem)
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{
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char const *format = (problem == -1
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? _("invalid argument %s for %s")
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: _("ambiguous argument %s for %s"));
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error (0, 0, format, quotearg_n_style (0, ARGMATCH_QUOTING_STYLE, value),
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quote_n (1, context));
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}
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/* List the valid arguments for argmatch.
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ARGLIST is the same as in argmatch.
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VALLIST is a pointer to an array of values.
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VALSIZE is the size of the elements of VALLIST */
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void
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argmatch_valid (const char *const *arglist,
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const char *vallist, size_t valsize)
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{
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int i;
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const char *last_val = NULL;
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/* We try to put synonyms on the same line. The assumption is that
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synonyms follow each other */
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fprintf (stderr, _("Valid arguments are:"));
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for (i = 0; arglist[i]; i++)
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if ((i == 0)
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|| memcmp (last_val, vallist + valsize * i, valsize))
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{
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fprintf (stderr, "\n - `%s'", arglist[i]);
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last_val = vallist + valsize * i;
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}
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else
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{
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fprintf (stderr, ", `%s'", arglist[i]);
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}
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putc ('\n', stderr);
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}
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/* Never failing versions of the previous functions.
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CONTEXT is the context for which argmatch is called (e.g.,
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"--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
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calls the (supposed never to return) function EXIT_FN. */
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int
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__xargmatch_internal (const char *context,
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const char *arg, const char *const *arglist,
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const char *vallist, size_t valsize,
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int case_sensitive,
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argmatch_exit_fn exit_fn)
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{
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int res = __argmatch_internal (arg, arglist,
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vallist, valsize,
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case_sensitive);
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if (res >= 0)
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/* Success. */
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return res;
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/* We failed. Explain why. */
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argmatch_invalid (context, arg, res);
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argmatch_valid (arglist, vallist, valsize);
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(*exit_fn) ();
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return -1; /* To please the compilers. */
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}
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/* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
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return the first corresponding argument in ARGLIST */
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const char *
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argmatch_to_argument (const char *value,
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const char *const *arglist,
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const char *vallist, size_t valsize)
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{
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int i;
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for (i = 0; arglist[i]; i++)
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if (!memcmp (value, vallist + valsize * i, valsize))
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return arglist[i];
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return NULL;
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}
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#ifdef TEST
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/*
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* Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
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*/
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char *program_name;
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extern const char *getenv ();
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/* When to make backup files. */
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enum backup_type
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{
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/* Never make backups. */
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none,
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/* Make simple backups of every file. */
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simple,
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/* Make numbered backups of files that already have numbered backups,
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and simple backups of the others. */
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numbered_existing,
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/* Make numbered backups of every file. */
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numbered
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};
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/* Two tables describing arguments (keys) and their corresponding
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values */
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static const char *const backup_args[] =
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{
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"no", "none", "off",
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"simple", "never",
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"existing", "nil",
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"numbered", "t",
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0
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};
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static const enum backup_type backup_vals[] =
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{
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none, none, none,
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simple, simple,
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numbered_existing, numbered_existing,
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numbered, numbered
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};
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int
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main (int argc, const char *const *argv)
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{
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const char *cp;
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enum backup_type backup_type = none;
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program_name = (char *) argv[0];
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if (argc > 2)
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{
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fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
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exit (1);
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}
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if ((cp = getenv ("VERSION_CONTROL")))
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backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp,
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backup_args, backup_vals);
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if (argc == 2)
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backup_type = XARGCASEMATCH (program_name, argv[1],
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backup_args, backup_vals);
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printf ("The version control is `%s'\n",
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ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));
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return 0;
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}
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#endif
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