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-rw-r--r--src/argmatch.c87
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diff --git a/src/argmatch.c b/src/argmatch.c
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+/* argmatch.c -- find a match for a string in an array
+ Copyright (C) 1990 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; if not, write to the Free Software Foundation, Inc.,
+ 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+/* Written by David MacKenzie <djm@ai.mit.edu> */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#ifdef STDC_HEADERS
+#include <string.h>
+#endif
+
+extern char *program_name;
+
+/* 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)
+ char *arg;
+ char **optlist;
+{
+ int i; /* Temporary index in OPTLIST. */
+ int 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)
+ char *kind;
+ 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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