S2OJ/judger/uoj_judger/builtin/checker/bcmp.cpp

#include <cstdio>

inline const char *englishEnding(int x)
{
	x %= 100;
	if (x / 10 == 1)
		return "th";
	if (x % 10 == 1)
		return "st";
	if (x % 10 == 2)
		return "nd";
	if (x % 10 == 3)
		return "rd";
	return "th";
}

int main(int argc, char * argv[])
{
	if (argc != 4)
		return 1;
	FILE *fout = fopen(argv[2], "r");
	FILE *fans = fopen(argv[3], "r");

	if (fout == NULL || fans == NULL)
		return 1;

	int n = 0;
	while (true)
	{
		n++;
		int c, d;
		c = fgetc(fout);
		d = fgetc(fans);
		if (c == EOF && d == EOF)
			break;
		if (c != d)
		{
			if (c == EOF)
				fprintf(stderr, "wrong answer %d%s byte differ - expected EOF found '%c'\n", n, englishEnding(n), (char)d);
			else if (d == EOF)
				fprintf(stderr, "wrong answer %d%s byte differ - expected '%c' found EOF\n", n, englishEnding(n), (char)c);
			else
				fprintf(stderr, "wrong answer %d%s byte differ - expected '%c' found '%c'\n", n, englishEnding(n), (char)c, (char)d);
			return 1;
		}
	}

	if (n == 0)
		fprintf(stderr, "ok empty file\n");
	else if (n == 1)
		fprintf(stderr, "ok single byte\n");
	else
		fprintf(stderr, "ok %d byte\n", n);
	return 0;
}