From d68a600d005d9c110145310dc249daaf73653436 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Thu, 2 Apr 2020 23:03:30 +0200
Subject: Add a libcompat implementation for getopt_long

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 configure.ac                         |  2 +-
 include/compat.h                     | 14 +++++++
 lib/compat/Makemodule.am             |  1 +
 lib/compat/getopt_long.c             | 72 ++++++++++++++++++++++++++++++++++++
 lib/compat/libcompat.vcxproj         |  1 +
 lib/compat/libcompat.vcxproj.filters |  3 ++
 6 files changed, 92 insertions(+), 1 deletion(-)
 create mode 100644 lib/compat/getopt_long.c

diff --git a/configure.ac b/configure.ac
index 0162334..79d48c0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -236,7 +236,7 @@ AX_COMPILE_CHECK_SIZEOF(long long)
 AC_CHECK_HEADERS([sys/xattr.h], [], [])
 AC_CHECK_HEADERS([sys/sysinfo.h], [], [])
 
-AC_CHECK_FUNCS([strndup getline getopt getsubopt])
+AC_CHECK_FUNCS([strndup getline getopt getsubopt getopt_long])
 
 ##### generate output #####
 
diff --git a/include/compat.h b/include/compat.h
index 6f8a77d..cb5ff23 100644
--- a/include/compat.h
+++ b/include/compat.h
@@ -204,6 +204,20 @@ extern char *optarg;
 int getopt(int argc, char *const argv[], const char *optstr);
 #endif
 
+#ifndef HAVE_GETOPT_LONG
+struct option {
+	const char *name;
+	int         has_arg;
+	int         val;
+};
+
+#define no_argument 0
+#define required_argument 1
+
+int getopt_long(int argc, char *const argv[], const char *optstr,
+		const struct option *longopts, int *longindex);
+#endif
+
 #if defined(_WIN32) || defined(__WINDOWS__)
 WCHAR *path_to_windows(const char *input);
 #endif
diff --git a/lib/compat/Makemodule.am b/lib/compat/Makemodule.am
index f1bb2de..b7649ef 100644
--- a/lib/compat/Makemodule.am
+++ b/lib/compat/Makemodule.am
@@ -2,6 +2,7 @@ libcompat_a_SOURCES = lib/compat/getline.c lib/compat/getsubopt.c
 libcompat_a_SOURCES += lib/compat/strndup.c lib/compat/mockups.c
 libcompat_a_SOURCES += lib/compat/chdir.c include/compat.h
 libcompat_a_SOURCES += lib/compat/path_to_windows.c lib/compat/getopt.c
+libcompat_a_SOURCES += lib/compat/getopt_long.c
 
 noinst_LIBRARIES += libcompat.a
 
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
diff --git a/lib/compat/libcompat.vcxproj b/lib/compat/libcompat.vcxproj
index 307754e..0dada12 100644
--- a/lib/compat/libcompat.vcxproj
+++ b/lib/compat/libcompat.vcxproj
@@ -157,6 +157,7 @@
     <ClCompile Include="chdir.c" />
     <ClCompile Include="getline.c" />
     <ClCompile Include="getopt.c" />
+    <ClCompile Include="getopt_long.c" />
     <ClCompile Include="getsubopt.c" />
     <ClCompile Include="mockups.c" />
     <ClCompile Include="path_to_windows.c" />
diff --git a/lib/compat/libcompat.vcxproj.filters b/lib/compat/libcompat.vcxproj.filters
index f2851d1..2eb9cfb 100644
--- a/lib/compat/libcompat.vcxproj.filters
+++ b/lib/compat/libcompat.vcxproj.filters
@@ -17,6 +17,9 @@
     <ClCompile Include="getopt.c">
       <Filter>Source</Filter>
     </ClCompile>
+    <ClCompile Include="getopt_long.c">
+      <Filter>Source</Filter>
+    </ClCompile>
     <ClCompile Include="getsubopt.c">
       <Filter>Source</Filter>
     </ClCompile>
-- 
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