1 /* argmatch.c -- find a match for a string in an array
2 Copyright (C) 1990 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
18 /* Written by David MacKenzie <djm@ai.mit.edu> */
29 extern char *program_name;
31 /* If ARG is an unambiguous match for an element of the
32 null-terminated array OPTLIST, return the index in OPTLIST
33 of the matched element, else -1 if it does not match any element
34 or -2 if it is ambiguous (is a prefix of more than one element). */
37 argmatch (arg, optlist)
41 int i; /* Temporary index in OPTLIST. */
42 int arglen; /* Length of ARG. */
43 int matchind = -1; /* Index of first nonexact match. */
44 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
46 arglen = strlen (arg);
48 /* Test all elements for either exact match or abbreviated matches. */
49 for (i = 0; optlist[i]; i++)
51 if (!strncmp (optlist[i], arg, arglen))
53 if (strlen (optlist[i]) == arglen)
54 /* Exact match found. */
56 else if (matchind == -1)
57 /* First nonexact match found. */
60 /* Second nonexact match found. */
70 /* Error reporting for argmatch.
71 KIND is a description of the type of entity that was being matched.
72 VALUE is the invalid value that was given.
73 PROBLEM is the return value from argmatch. */
76 invalid_arg (kind, value, problem)
81 fprintf (stderr, "%s: ", program_name);
83 fprintf (stderr, "invalid");
85 fprintf (stderr, "ambiguous");
86 fprintf (stderr, " %s `%s'\n", kind, value);