support str() from bytes to string

package/PikaStdLib/PikaStdLib_SysObj.c

@@ -116,6 +116,10 @@ char* PikaStdLib_SysObj_str(PikaObj* self, Arg* arg) {
         res = strsFormat(&buffs, 11, "%f", val);
         goto exit;
     }
+    if (ARG_TYPE_BYTES == type) {
+        res = (char*)arg_getBytes(arg);
+        goto exit;
+    }
     if (argType_isObject(type)) {
         res = obj_toStr(arg_getPtr(arg));
         if (NULL != res) {

port/linux/package/pikascript/pikascript-lib/PikaStdLib/PikaStdLib_SysObj.c

@@ -116,6 +116,10 @@ char* PikaStdLib_SysObj_str(PikaObj* self, Arg* arg) {
         res = strsFormat(&buffs, 11, "%f", val);
         goto exit;
     }
+    if (ARG_TYPE_BYTES == type) {
+        res = (char*)arg_getBytes(arg);
+        goto exit;
+    }
     if (argType_isObject(type)) {
         res = obj_toStr(arg_getPtr(arg));
         if (NULL != res) {

port/linux/test/ctypes-test.cpp

@@ -0,0 +1,57 @@
+#include "gtest/gtest.h"
+#include "test_common.h"
+extern "C" {
+#include "PikaMain.h"
+#include "PikaParser.h"
+#include "PikaStdLib_MemChecker.h"
+#include "PikaVM.h"
+#include "dataArgs.h"
+#include "dataMemory.h"
+#include "dataStrs.h"
+#include "pikaScript.h"
+#include "pika_config_gtest.h"
+}
+
+extern PikaMemInfo pikaMemInfo;
+/* the log_buff of printf */
+extern char log_buff[LOG_BUFF_MAX][LOG_SIZE];
+
+TEST(ctypes, test1) {
+    /* init */
+    pikaMemInfo.heapUsedMax = 0;
+    PikaObj* pikaMain = newRootObj("pikaMain", New_PikaMain);
+    /* run */
+    obj_run(pikaMain,
+        "read_data = ctypes.c_buffer(b'', 16)\n"
+        "print(\"----read size----\")\n"
+        "datalen = len(read_data.raw)\n"
+        "print(datalen)\n"
+        "print(read_data.raw)\n"
+        "print(\"----read data----\")\n"
+        "for i in range(0,datalen):\n"
+        "    print(read_data.raw[i])\n"
+        "\n");
+    /* collect */
+    /* assert */
+    EXPECT_STREQ(log_buff[67], "16\r\n");
+    /* deinit */
+    obj_deinit(pikaMain);
+    EXPECT_EQ(pikaMemNow(), 0);
+}
+
+TEST(ctypes, test2) {
+    /* init */
+    pikaMemInfo.heapUsedMax = 0;
+    PikaObj* pikaMain = newRootObj("pikaMain", New_PikaMain);
+    /* run */
+    obj_run(pikaMain,
+    "len(b'test\\x0')\n"
+    "len(str(b'test\\x0'))\n");
+    /* collect */
+    /* assert */
+    EXPECT_STREQ(log_buff[0], "4\r\n");
+    EXPECT_STREQ(log_buff[1], "5\r\n");
+    /* deinit */
+    obj_deinit(pikaMain);
+    EXPECT_EQ(pikaMemNow(), 0);
+}

src/dataArg.c

@@ -129,12 +129,13 @@ Arg* arg_setType(Arg* self, ArgType type) {
 }
 
 Arg* arg_setBytes(Arg* self, char* name, uint8_t* src, size_t size) {
-    self = arg_newContent(self, size + sizeof(size_t));
+    self = arg_newContent(self, size + sizeof(size_t) + 1);
     self = arg_setName(self, name);
     self = arg_setType(self, ARG_TYPE_BYTES);
     void* dir = arg_getContent(self);
     /* set content all to 0 */
-    __platform_memset(dir, 0, size + sizeof(size_t));
+    __platform_memset(dir, 0, size + sizeof(size_t) + 1);
+    /* setsize */
     __platform_memcpy(dir, &size, sizeof(size_t));
 
     /* set init value */