Add IO type checking functions, add ReadLine

src/Buffer.c

@@ -302,3 +302,12 @@ BH_IO *BH_BufferNew(BH_IO *device,
 
     return (BH_IO*)buffer;
 }
+
+
+int BH_IOIsBuffer(BH_IO *device)
+{
+    if (!device)
+        return 0;
+
+    return device->callback == (BH_IOCallback)bufferCallback;
+}

src/Bytes.c

@@ -215,3 +215,13 @@ BH_IO *BH_BytesNew(char *data,
 
     return (BH_IO*)bytes;
 }
+
+
+int BH_IOIsBytes(BH_IO *device)
+{
+    if (!device)
+        return 0;
+
+    return device->callback == (BH_IOCallback)bytesCallback;
+}
+

src/IO.c

@@ -178,3 +178,53 @@ int BH_IOEndOfFile(BH_IO *device)
 
     return flags & BH_IO_FLAG_EOF;
 }
+
+
+char *BH_IOReadLine(BH_IO *device,
+                    char *str,
+                    size_t size)
+{
+    size_t i, actual;
+
+    if (size < 1)
+        return NULL;
+
+    i = 0;
+    while (i < size - 1)
+    {
+        if (BH_IORead(device, str + i, 1, &actual) || actual != 1)
+            break;
+
+        if (str[i++] == '\n')
+            break;
+    }
+    str[i] = 0;
+    return i ? str : NULL;
+}
+
+
+char *BH_IOReadLineFull(BH_IO *device,
+                        char *str,
+                        size_t size)
+{
+    size_t i, actual;
+    char data;
+
+    if (size < 1)
+        return NULL;
+
+    i = 0;
+    while (1)
+    {
+        if (BH_IORead(device, &data, 1, &actual) || actual != 1)
+            break;
+
+        if (i < size - 1)
+            str[i++] = data;
+
+        if (data == '\n')
+            break;
+    }
+    str[i] = 0;
+    return i ? str : NULL;
+}

src/Platform/Dummy/File.c

@@ -13,3 +13,9 @@ BH_IO *BH_FileNew(const char *path,
 
     return NULL;
 }
+
+
+int BH_IOIsFile(BH_IO *device)
+{
+    return 0;
+}

src/Platform/Posix/File.c

@@ -306,3 +306,12 @@ BH_IO *BH_FileNew(const char *path,
 
     return (BH_IO*)file;
 }
+
+
+int BH_IOIsFile(BH_IO *device)
+{
+    if (!device)
+        return 0;
+
+    return device->callback == (BH_IOCallback)fileCallback;
+}

src/Platform/Win32/File.c

@@ -315,3 +315,12 @@ BH_IO *BH_FileNew(const char *path,
 
     return (BH_IO*)file;
 }
+
+
+int BH_IOIsFile(BH_IO *device)
+{
+    if (!device)
+        return 0;
+
+    return device->callback == (BH_IOCallback)fileCallback;
+}