build: Split test programs off into separate files

This avoids spurious library rebuilds when only the test program
code is changed and simplifies the build system.

libavutil/avstring-test.c

@@ -0,0 +1,69 @@
+/*
+ * 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
+ */
+
+#include <stdio.h>
+
+#include "common.h"
+#include "mem.h"
+#include "avstring.h"
+
+int main(void)
+{
+    int i;
+    const char *strings[] = {
+        "''",
+        "",
+        ":",
+        "\\",
+        "'",
+        "    ''    :",
+        "    ''  ''  :",
+        "foo   '' :",
+        "'foo'",
+        "foo     ",
+        "  '  foo  '  ",
+        "foo\\",
+        "foo':  blah:blah",
+        "foo\\:  blah:blah",
+        "foo\'",
+        "'foo :  '  :blahblah",
+        "\\ :blah",
+        "     foo",
+        "      foo       ",
+        "      foo     \\ ",
+        "foo ':blah",
+        " foo   bar    :   blahblah",
+        "\\f\\o\\o",
+        "'foo : \\ \\  '   : blahblah",
+        "'\\fo\\o:': blahblah",
+        "\\'fo\\o\\:':  foo  '  :blahblah"
+    };
+
+    printf("Testing av_get_token()\n");
+    for (i = 0; i < FF_ARRAY_ELEMS(strings); i++) {
+        const char *p = strings[i];
+        char *q;
+        printf("|%s|", p);
+        q = av_get_token(&p, ":");
+        printf(" -> |%s|", q);
+        printf(" + |%s|\n", p);
+        av_free(q);
+    }
+
+    return 0;
+}