fix: 修复测试发现的 5 个模块 bugs

- libfunc: func_cal_crc16/crc32 空数据返回初始值(0xFFFF/0xFFFFFFFF)而非0
- libfunc: func_str2time_sys 年份字段减去1900（适配7-bit位域）
- libfunc: func_proc_pid_by_name path[128]→[384] 修复snprintf截断警告
- libtask: task_msg_queue_recv 返回实际消息长度而非固定0
- libxml: myXml_new_child 调用 InsertEndChild 将新元素挂到父节点
- libcmd: cmd_sub_complete 无空格时以完整buf为前缀（修复ncomp=0）

所有修改均通过对应单元测试验证。

src/public/libcmd/src/myCmd.cpp

@@ -140,15 +140,14 @@ void cmd_sub_complete(const char *buf, char ***completions, int *ncomp,
 {
     const char *prefix = strrchr(buf, ' ');
 
-    if (!prefix)
+    if (prefix)
     {
-        *ncomp = 0;
-        *completions = NULL;
-
-        return;
+        prefix++;
+    }
+    else
+    {
+        prefix = buf;
     }
-
-    prefix++;
 
     int cnt = 0;
     char **c = NULL;

src/public/libfunc/src/myFunc.c

@@ -107,12 +107,13 @@ uint16_t func_cal_sum_word(const uint8_t *d, uint32_t n)
 
 uint16_t func_cal_crc16(const uint8_t *d, uint32_t n)
 {
-	if (!d || !n)
+	if (!n)
 	{
-		return 0;
+		return 0xFFFF;
 	}
 
 	uint16_t crc = 0xFFFF;
+
 	for (uint32_t i = 0; i < n; i++)
 	{
 		crc = (crc >> 8) ^ _crc16_tab[(uint8_t)(crc ^ d[i])];
@@ -123,12 +124,13 @@ uint16_t func_cal_crc16(const uint8_t *d, uint32_t n)
 
 uint32_t func_cal_crc32(const uint8_t *d, uint32_t n)
 {
-	if (!d || !n)
+	if (!n)
 	{
-		return 0;
+		return 0xFFFFFFFF;
 	}
 
 	uint32_t crc = 0xFFFFFFFF;
+
 	for (uint32_t i = 0; i < n; i++)
 	{
 		crc = (crc >> 8) ^ _crc32_tab[(uint8_t)(crc ^ d[i])];
@@ -456,7 +458,7 @@ int func_str2time_sys(const char *s, stru_time_sys *t)
 		return -1;
 	}
 
-	t->year  = y;
+	t->year  = y - 1900;
 	t->month = mo;
 	t->day   = d;
 	t->hour  = h;
@@ -960,7 +962,7 @@ int func_proc_pid_by_name(const char *name)
 			continue;
 		}
 		char comm[64];
-		char path[128];
+		char path[384];
 		snprintf(path, sizeof(path), "/proc/%s/comm", e->d_name);
 		FILE *fp = fopen(path, "r");
 		if (!fp)

src/public/libtask/src/myTask.c

@@ -740,9 +740,10 @@ int task_msg_queue_recv(stru_task_msg_queue_t p_queue, void *msg,
 	p->head = (p->head + 1) % p->max_msgs;
 	p->msg_count--;
 
+	pthread_cond_signal(&p->cond);
 	pthread_mutex_unlock(&p->lock);
 
-	return 0;
+	return (int)msg_len;
 }
 
 /**

src/public/libxml/src/myXml.cpp

@@ -131,8 +131,16 @@ myXmlElem_t myXml_new_child(myXmlElem_t parent, const char *name)
     }
 
     tinyxml2::XMLDocument *doc = ((tinyxml2::XMLElement *)parent)->GetDocument();
+    tinyxml2::XMLElement  *el  = doc->NewElement(name);
 
-    return (myXmlElem_t)(doc->NewElement(name));
+    if (!el)
+    {
+        return NULL;
+    }
+
+    ((tinyxml2::XMLElement *)parent)->InsertEndChild(el);
+
+    return (myXmlElem_t)(el);
 }
 
 void myXml_set_attr(myXmlElem_t elem, const char *name, const char *value)