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+dnl Copyright 2010 The Kyua Authors.
+dnl All rights reserved.
+dnl
+dnl Redistribution and use in source and binary forms, with or without
+dnl modification, are permitted provided that the following conditions are
+dnl met:
+dnl
+dnl * Redistributions of source code must retain the above copyright
+dnl notice, this list of conditions and the following disclaimer.
+dnl * Redistributions in binary form must reproduce the above copyright
+dnl notice, this list of conditions and the following disclaimer in the
+dnl documentation and/or other materials provided with the distribution.
+dnl * Neither the name of Google Inc. nor the names of its contributors
+dnl may be used to endorse or promote products derived from this software
+dnl without specific prior written permission.
+dnl
+dnl THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+dnl "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+dnl LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+dnl A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+dnl OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+dnl SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+dnl LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+dnl DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+dnl THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+dnl (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+dnl OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+dnl Checks if getopt(3) supports a + sign to enforce POSIX correctness.
+dnl
+dnl In the GNU implementation of getopt(3), we need to pass a + sign at
+dnl the beginning of the options string to request POSIX behavior.
+dnl
+dnl Defines HAVE_GETOPT_GNU if a + sign is supported.
+AC_DEFUN([_KYUA_GETOPT_GNU], [
+ AC_CACHE_CHECK(
+ [whether getopt allows a + sign for POSIX behavior optreset],
+ [kyua_cv_getopt_gnu], [
+ AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>], [
+ int argc = 4;
+ char* argv@<:@5@:>@ = {
+ strdup("conftest"),
+ strdup("-+"),
+ strdup("-a"),
+ strdup("bar"),
+ NULL
+ };
+ int ch;
+ int seen_a = 0, seen_plus = 0;
+
+ while ((ch = getopt(argc, argv, "+a:")) != -1) {
+ switch (ch) {
+ case 'a':
+ seen_a = 1;
+ break;
+
+ case '+':
+ seen_plus = 1;
+ break;
+
+ case '?':
+ default:
+ ;
+ }
+ }
+
+ return (seen_a && !seen_plus) ? EXIT_SUCCESS : EXIT_FAILURE;
+])],
+ [kyua_cv_getopt_gnu=yes],
+ [kyua_cv_getopt_gnu=no])
+ ])
+ if test "${kyua_cv_getopt_gnu}" = yes; then
+ AC_DEFINE([HAVE_GETOPT_GNU], [1],
+ [Define to 1 if getopt allows a + sign for POSIX behavior])
+ fi
+])
+
+dnl Checks if optreset exists to reset the processing of getopt(3) options.
+dnl
+dnl getopt(3) has an optreset global variable to reset internal state
+dnl before calling getopt(3) again. However, optreset is not standard and
+dnl is only present in the BSD versions of getopt(3).
+dnl
+dnl Defines HAVE_GETOPT_WITH_OPTRESET if optreset exists.
+AC_DEFUN([_KYUA_GETOPT_WITH_OPTRESET], [
+ AC_CACHE_CHECK(
+ [whether getopt has optreset],
+ [kyua_cv_getopt_optreset], [
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([
+#include <stdlib.h>
+#include <unistd.h>
+
+int
+main(void)
+{
+ optreset = 1;
+ return EXIT_SUCCESS;
+}
+])],
+ [kyua_cv_getopt_optreset=yes],
+ [kyua_cv_getopt_optreset=no])
+ ])
+ if test "${kyua_cv_getopt_optreset}" = yes; then
+ AC_DEFINE([HAVE_GETOPT_WITH_OPTRESET], [1],
+ [Define to 1 if getopt has optreset])
+ fi
+])
+
+
+dnl Checks the value to pass to optind to reset getopt(3) processing.
+dnl
+dnl The standard value to pass to optind to reset the processing of command
+dnl lines with getopt(3) is 1. However, the GNU extensions to getopt_long(3)
+dnl are not properly reset unless optind is set to 0, causing crashes later
+dnl on and incorrect option processing behavior.
+dnl
+dnl Sets the GETOPT_OPTIND_RESET_VALUE macro to the integer value that has to
+dnl be passed to optind to reset option processing.
+AC_DEFUN([_KYUA_GETOPT_OPTIND_RESET_VALUE], [
+ AC_CACHE_CHECK(
+ [for the optind value to reset getopt processing],
+ [kyua_cv_getopt_optind_reset_value], [
+ AC_RUN_IFELSE([AC_LANG_SOURCE([
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static void
+first_pass(void)
+{
+ int argc, ch, flag;
+ char* argv@<:@5@:>@;
+
+ argc = 4;
+ argv@<:@0@:>@ = strdup("progname");
+ argv@<:@1@:>@ = strdup("-a");
+ argv@<:@2@:>@ = strdup("foo");
+ argv@<:@3@:>@ = strdup("bar");
+ argv@<:@4@:>@ = NULL;
+
+ flag = 0;
+ while ((ch = getopt(argc, argv, "+:a")) != -1) {
+ switch (ch) {
+ case 'a':
+ flag = 1;
+ break;
+ default:
+ break;
+ }
+ }
+ if (!flag) {
+ exit(EXIT_FAILURE);
+ }
+}
+
+static void
+second_pass(void)
+{
+ int argc, ch, flag;
+ char* argv@<:@5@:>@;
+
+ argc = 4;
+ argv@<:@0@:>@ = strdup("progname");
+ argv@<:@1@:>@ = strdup("-b");
+ argv@<:@2@:>@ = strdup("foo");
+ argv@<:@3@:>@ = strdup("bar");
+ argv@<:@4@:>@ = NULL;
+
+ flag = 0;
+ while ((ch = getopt(argc, argv, "b")) != -1) {
+ switch (ch) {
+ case 'b':
+ flag = 1;
+ break;
+ default:
+ break;
+ }
+ }
+ if (!flag) {
+ exit(EXIT_FAILURE);
+ }
+}
+
+int
+main(void)
+{
+ /* We do two passes in two different functions to prevent the reuse of
+ * variables and, specially, to force the use of two different argument
+ * vectors. */
+ first_pass();
+ optind = 0;
+ second_pass();
+ return EXIT_SUCCESS;
+}
+])],
+ [kyua_cv_getopt_optind_reset_value=0],
+ [kyua_cv_getopt_optind_reset_value=1])
+ ])
+ AC_DEFINE_UNQUOTED([GETOPT_OPTIND_RESET_VALUE],
+ [${kyua_cv_getopt_optind_reset_value}],
+ [Define to the optind value to reset getopt processing])
+])
+
+
+dnl Wrapper macro to detect all getopt(3) necessary features.
+AC_DEFUN([KYUA_GETOPT], [
+ _KYUA_GETOPT_GNU
+ _KYUA_GETOPT_OPTIND_RESET_VALUE
+ _KYUA_GETOPT_WITH_OPTRESET
+])