fuzzer_options_parser: add options parser fuzzing

To improve coverage of parse_commandline.c

fuzzers/fuzzer_options_parser.c

@@ -0,0 +1,68 @@
+/*
+ * This file is part of mpv.
+ *
+ * mpv 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.
+ *
+ * mpv 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 mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#include "common.h"
+
+int mpv_initialize_opts(mpv_handle *ctx, char **options);
+
+#define MAX_INPUT_SIZE (1 << 20)
+#define MAX_OPTS_NUM 10000
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+    char buff[MAX_INPUT_SIZE + 2];
+
+    if (!size || size > MAX_INPUT_SIZE)
+        return 0;
+
+    memcpy(buff, data, size);
+    buff[size] = '\0';
+    buff[size + 1] = '\0';
+
+    char *opts[MAX_OPTS_NUM + 1];
+    char *opt = buff;
+    int count = 0;
+    while (*opt && count < MAX_OPTS_NUM) {
+        opts[count] = opt;
+
+        while (*opt && !isspace(*opt))
+            opt++;
+
+        *opt = '\0';
+        opt++;
+
+        while (*opt && isspace(*opt))
+            opt++;
+
+        count++;
+    }
+    opts[count] = NULL;
+
+    mpv_handle *ctx = mpv_create();
+    if (!ctx)
+        exit(1);
+
+    mpv_initialize_opts(ctx, opts);
+
+    mpv_terminate_destroy(ctx);
+
+    return 0;
+}