-#define CHARBUF_SIZE 0x4000
-
-#define ALLOC_CONVERSION_WORK_AREA(coding) \
- do { \
- coding->charbuf = SAFE_ALLOCA (CHARBUF_SIZE * sizeof (int)); \
- coding->charbuf_size = CHARBUF_SIZE; \
+#define ALLOC_CONVERSION_WORK_AREA(coding, size) \
+ do { \
+ int units = ((size) > MAX_CHARBUF_SIZE ? MAX_CHARBUF_SIZE \
+ : (size) < MIN_CHARBUF_SIZE ? MIN_CHARBUF_SIZE \
+ : size); \
+ coding->charbuf = SAFE_ALLOCA ((units) * sizeof (int)); \
+ coding->charbuf_size = (units); \