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+/* argmatch.c -- find a match for a string in an array
+
+ Copyright (C) 1990, 1998-1999, 2001-2007, 2009-2023 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 <https://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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define _(msgid) gettext (msgid)
+
+#include "error.h"
+#include "quotearg.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. 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. */
+
+ptrdiff_t
+argmatch (const char *arg, const char *const *arglist,
+ const void *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 ((char const *) vallist + valsize * matchind,
+ (char const *) vallist + valsize * i, valsize))
+ {
+ /* There is a real ambiguity, or we could not
+ disambiguate. */
+ ambiguous = true;
+ }
+ }
+ }
+ }
+ if (ambiguous)
+ return -2;
+ else
+ return matchind;
+}
+
+ptrdiff_t
+argmatch_exact (const char *arg, const char *const *arglist)
+{
+ size_t i;
+
+ /* Test elements for exact match. */
+ for (i = 0; arglist[i]; i++)
+ {
+ if (!strcmp (arglist[i], arg))
+ return i;
+ }
+
+ return -1;
+}
+
+/* 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 void *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 */
+ fputs (_("Valid arguments are:"), stderr);
+ for (i = 0; arglist[i]; i++)
+ if ((i == 0)
+ || memcmp (last_val, (char const *) vallist + valsize * i, valsize))
+ {
+ fprintf (stderr, "\n - %s", quote (arglist[i]));
+ last_val = (char const *) vallist + valsize * i;
+ }
+ else
+ {
+ fprintf (stderr, ", %s", quote (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 void *vallist, size_t valsize,
+ argmatch_exit_fn exit_fn,
+ bool allow_abbreviation)
+{
+ ptrdiff_t res;
+
+ if (allow_abbreviation)
+ res = argmatch (arg, arglist, vallist, valsize);
+ else
+ res = argmatch_exact (arg, arglist);
+
+ 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 void *value,
+ const char *const *arglist,
+ const void *vallist, size_t valsize)
+{
+ size_t i;
+
+ for (i = 0; arglist[i]; i++)
+ if (!memcmp (value, (char const *) vallist + valsize * i, valsize))
+ return arglist[i];
+ return NULL;
+}
+
+#ifdef TEST
+/*
+ * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
+ */
+
+/* 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;
+
+ if (argc > 2)
+ {
+ fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", getprogname ());
+ exit (1);
+ }
+
+ if ((cp = getenv ("VERSION_CONTROL")))
+ backup_type = XARGMATCH ("$VERSION_CONTROL", cp,
+ backup_args, backup_vals);
+
+ if (argc == 2)
+ backup_type = XARGMATCH (getprogname (), 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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