paleolimbot commented on code in PR #587:
URL: https://github.com/apache/arrow-adbc/pull/587#discussion_r1167221556
##########
c/driver/common/utils.c:
##########
@@ -124,19 +124,33 @@ void StringBuilderInit(struct StringBuilder* builder,
size_t initial_size) {
builder->size = 0;
builder->capacity = initial_size;
}
-void StringBuilderAppend(struct StringBuilder* builder, const char* value) {
- size_t length = strlen(value);
- size_t new_size = builder->size + length;
- if (new_size > builder->capacity) {
- size_t new_capacity = builder->size + length - builder->capacity;
- if (builder->size == 0) new_capacity++;
-
- builder->buffer = realloc(builder->buffer, new_capacity);
- builder->capacity = new_capacity;
+void StringBuilderAppend(struct StringBuilder* builder, const char* fmt, ...) {
+ va_list argptr;
+ char* value;
+
+ va_start(argptr, fmt);
Review Comment:
Can you use `vsnprintf()` here and nanoarrow's `ArrowBuffer` to simplify
anything here? Maybe:
```c
int chars_required = vsnprintf(NULL, 0, fmt, va_args);
ArrowBufferReserve(buffer, chars_required + 1)
vsnprintf(buffer->data + buffer->size_bytes, chars_required, fmt, va_args);
buffer->size_bytes += chars_required;
```
(Maybe I'm misunderstanding what this does too though...also I forget the
exact details of where you have to do + 1 with the return value of vsnprintf)
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