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/* argmatch.c -- find a match for a string in an array
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Copyright (C) 1990, 1997 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; see the file COPYING.
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If not, write to the Free Software Foundation,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by David MacKenzie <djm@gnu.ai.mit.edu> */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <argmatch.h>
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#include <sys/types.h>
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#include <stdio.h>
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#if HAVE_STRING_H
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# include <string.h>
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#else
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# include <strings.h>
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#endif
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/* If ARG is an unambiguous match for an element of the
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null-terminated array OPTLIST, return the index in OPTLIST
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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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int
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argmatch (arg, optlist)
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const char *arg;
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const char *const *optlist;
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{
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int i; /* Temporary index in OPTLIST. */
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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; optlist[i]; i++)
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{
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if (!strncmp (optlist[i], arg, arglen))
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{
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if (strlen (optlist[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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/* Second nonexact match found. */
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ambiguous = 1;
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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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/* Error reporting for argmatch.
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KIND 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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invalid_arg (kind, value, problem)
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const char *kind;
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const char *value;
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int problem;
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{
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fprintf (stderr, "%s: ", program_name);
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if (problem == -1)
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fprintf (stderr, "invalid");
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else /* Assume -2. */
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fprintf (stderr, "ambiguous");
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fprintf (stderr, " %s `%s'\n", kind, value);
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}
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