convert fuzz target to c89, optimize

fuzzing/cjson_read_fuzzer.c

@@ -0,0 +1,68 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "../cJSON.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size); /* required by C89 */
+
+int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
+{
+    cJSON *json;
+    size_t offset = 4;
+    unsigned char *copied;
+    char *printed_json = NULL;
+    int minify, require_termination, formatted, buffered;
+
+
+    if(size <= offset) return 0;
+    if(data[size-1] != '\0') return 0;
+    if(data[0] != '1' && data[0] != '0') return 0;
+    if(data[1] != '1' && data[1] != '0') return 0;
+    if(data[2] != '1' && data[2] != '0') return 0;
+    if(data[3] != '1' && data[3] != '0') return 0;
+
+    minify              = data[0] == '1' ? 1 : 0;
+    require_termination = data[1] == '1' ? 1 : 0;
+    formatted           = data[2] == '1' ? 1 : 0;
+    buffered            = data[3] == '1' ? 1 : 0;
+
+    json = cJSON_ParseWithOpts((const char*)data + offset, NULL, require_termination);
+
+    if(json == NULL) return 0;
+
+    if(buffered)
+    {
+        printed_json = cJSON_PrintBuffered(json, 1, formatted);
+    }
+    else
+    {
+        /* unbuffered printing */
+        if(formatted)
+        {
+            printed_json = cJSON_Print(json);
+        }
+        else
+        {
+            printed_json = cJSON_PrintUnformatted(json);
+        }
+    }
+
+    if(printed_json != NULL) free(printed_json);
+
+    if(minify)
+    {
+        copied = (unsigned char*)malloc(size);
+        if(copied == NULL) return 0;
+
+        memcpy(copied, data, size);
+
+        cJSON_Minify((char*)copied + offset);
+
+        free(copied);
+    }
+
+    cJSON_Delete(json);
+
+    return 0;
+}