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