Aggressively Golfed C-99 Quicksort

quicksort.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

static char str_[] = "C programming is fun!", *buf_, tmp_;

void sort(char *src_, char *dst_, int n_)
{
	if (!src_[n_] || (n_ <= 1)) return;
	if (dst_[n_] >= (tmp_ = dst_[n_ - 1])) return;
	dst_[n_ - 1] = dst_[n_];
	dst_[n_] = tmp_;
	sort(src_, dst_, n_ - 1);
}

int main(int argc, char *argv[])
{
	memcpy(buf_ = calloc(sizeof(str_), 1), str_, sizeof(str_));
	for (int i = 0; i < sizeof(str_); ++i)
		sort(str_, buf_, i);
	for (int j = 0; j < sizeof(str_); ++j)
		if (buf_[j] != ' ') putchar(buf_[j]);
	return 0;
}