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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 (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. */
- void
- invalid_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);
- }
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