1 files changed, 72 insertions, 0 deletions
diff --git a/lib/compat/getopt_long.c b/lib/compat/getopt_long.c
new file mode 100644
index 0000000..24f5864
--- /dev/null
+++ b/lib/compat/getopt_long.c
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * getopt_long.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+#include "compat.h"
+
+#ifdef HAVE_GETOPT
+#include <unistd.h>
+#endif
+
+#include <stdio.h>
+#include <string.h>
+
+#ifndef HAVE_GETOPT_LONG
+int getopt_long(int argc, char *const argv[], const char *optstr,
+		const struct option *longopts, int *longindex)
+{
+	size_t i, len;
+	char *ptr;
+	(void)longindex;
+
+	if (optind >= argc || argv[optind][0] != '-' ||
+	    argv[optind][1] != '-' || argv[optind][2] == '\0')
+		return getopt(argc, argv, optstr);
+
+	optarg = NULL;
+	ptr = argv[optind] + 2;
+
+	for (len = 0; ptr[len] != '\0' && ptr[len] != '='; ++len)
+		;
+
+	for (i = 0; longopts[i].name != NULL; ++i) {
+		if (strncmp(longopts[i].name, ptr, len) != 0)
+			continue;
+
+		if (longopts[i].name[len] == '\0')
+			break;
+	}
+
+	if (longopts[i].name == NULL)
+		goto fail_unknown;
+
+	if (ptr[len] == '=') {
+		if (!longopts[i].has_arg)
+			goto fail_arg;
+
+		optarg = ptr + len + 1;
+	} else if (longopts[i].has_arg) {
+		if (++optind >= argc)
+			goto fail_no_arg;
+
+		optarg = argv[optind];
+	}
+
+	++optind;
+	return longopts[i].val;
+fail_unknown:
+	fprintf(stderr, "%s: unknown option `--%s`\n", argv[0], ptr);
+	return '?';
+fail_arg:
+	fprintf(stderr, "%s: no argument expected for option `--%s`\n",
+		argv[0], ptr);
+	return '?';
+fail_no_arg:
+	fprintf(stderr, "%s: missing argument for option `--%s`\n",
+		argv[0], ptr);
+	return '?';
+}
+#endif