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/* 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). */
int
argmatch (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. */
void
invalid_arg (const char *kind, const char *value, int problem)
{
const char *fmt = (problem == -1
? "%s: invalid %s `%s'\n"
: "%s: ambiguous %s `%s'\n");
fprintf (stderr, fmt, program_name, kind, value);
}
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