dct/fft-test: use a replacement getopt() if the system has none present.

This allows compiling and running these tests on systems lacking a built-
in version of getopt(), such as MSVC.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

compat/getopt.c

+/*
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * Libav 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+ * This file was copied from the following newsgroup posting:
+ *
+ * Newsgroups: mod.std.unix
+ * Subject: public domain AT&T getopt source
+ * Date: 3 Nov 85 19:34:15 GMT
+ *
+ * Here's something you've all been waiting for:  the AT&T public domain
+ * source for getopt(3).  It is the code which was given out at the 1985
+ * UNIFORUM conference in Dallas.  I obtained it by electronic mail
+ * directly from AT&T.  The people there assure me that it is indeed
+ * in the public domain.
+ */
+
+#define EOF (-1)
+
+static int opterr = 1;
+static int optind = 1;
+static int optopt;
+static char *optarg;
+
+#undef fprintf
+
+static int getopt(int argc, char *argv[], char *opts)
+{
+    static int sp = 1;
+    int c;
+    char *cp;
+
+    if (sp == 1)
+        if (optind >= argc ||
+            argv[optind][0] != '-' || argv[optind][1] == '\0')
+            return EOF;
+        else if (!strcmp(argv[optind], "--")) {
+            optind++;
+            return EOF;
+        }
+    optopt = c = argv[optind][sp];
+    if (c == ':' || (cp = strchr(opts, c)) == NULL) {
+        fprintf(stderr, ": illegal option -- %c\n", c);
+        if (argv[optind][++sp] == '\0') {
+            optind++;
+            sp = 1;
+        }
+        return '?';
+    }
+    if (*++cp == ':') {
+        if (argv[optind][sp+1] != '\0')
+            optarg = &argv[optind++][sp+1];
+        else if(++optind >= argc) {
+            fprintf(stderr, ": option requires an argument -- %c\n", c);
+            sp = 1;
+            return '?';
+        } else
+            optarg = argv[optind++];
+        sp = 1;
+    } else {
+        if (argv[optind][++sp] == '\0') {
+            sp = 1;
+            optind++;
+        }
+        optarg = NULL;
+    }
+
+    return c;
+}

configure

@@ -1083,6 +1083,7 @@ HAVE_LIST="
     fork
     getaddrinfo
     gethrtime
+    getopt
     GetProcessAffinityMask
     GetProcessMemoryInfo
     GetProcessTimes
@@ -2862,6 +2863,7 @@ check_func  fcntl
 check_func  fork
 check_func  getaddrinfo $network_extralibs
 check_func  gethrtime
+check_func  getopt
 check_func  getrusage
 check_struct "sys/time.h sys/resource.h" "struct rusage" ru_maxrss
 check_func  gettimeofday

libavcodec/dct-test.c

@@ -25,10 +25,13 @@
  * Started from sample code by Juan J. Sierralta P.
  */
 
+#include "config.h"
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#if HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <math.h>
 
 #include "libavutil/cpu.h"
@@ -474,6 +477,10 @@ static void help(void)
            "-t          speed test\n");
 }
 
+#if !HAVE_GETOPT
+#include "compat/getopt.c"
+#endif
+
 int main(int argc, char **argv)
 {
     int test_idct = 0, test_248_dct = 0;

libavcodec/fft-test.c

@@ -34,7 +34,9 @@
 #include "rdft.h"
 #endif
 #include <math.h>
+#if HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <stdlib.h>
 #include <string.h>
 
@@ -229,6 +231,10 @@ enum tf_transform {
     TRANSFORM_DCT,
 };
 
+#if !HAVE_GETOPT
+#include "compat/getopt.c"
+#endif
+
 int main(int argc, char **argv)
 {
     FFTComplex *tab, *tab1, *tab_ref;