プログラマ専用SNS ミクプラ

コード:

#include <stdio.h>

void print(const int *x)
{
	int i, j = -1, k = 0, m = 0, n, c = 0;
	for (i = 0; i < 8; i++)
		if (x[i]) k = 0;
		else if (++k > m) m = k, j = i;
	n = j - m;
	for (i = 0; i <= n; i++) c = printf(c ? ":%x" : "%x", x[i]);
	if (m > 1) printf("::"), c = 0;
	while (++j < 8) c = printf(c ? ":%x" : "%x", x[j]);
	putchar('\n');
}

int main(void)
{
	char s[100];  int x[8];

	while (printf(">> "), scanf("%99s", s) == 1) {
		//puts(s);
		if (sscanf(s, "%4x:%4x:%4x:%4x:%4x:%4x:%4x:%4x",
			x, x+1, x+2, x+3, x+4, x+5, x+6, x+7) == 8) print(x);
		else puts("error");
	}
	return 0;
}