filecmp

Borland C++ Compiler 5.5

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

#define BUFFER_SIZE	65536

int filecmp(const char *pcFile1, const char *pcFile2);

int main(int argc, char **argv)
{
	if (argc != 3) {
		fprintf(stderr, "usage: filecmp file1 file2\n");
		return 1;
	}

switch (filecmp(argv[1], argv[2])) {
	case 0:
		fprintf(stderr, "filecmp: 一致\n");
		break;
	case 1:
		fprintf(stderr, "filecmp: 不一致\n");
		break;
	}

return 0;
}

int filecmp(const char *pcFile1, const char *pcFile2)
{
	FILE	*pfile1;
	FILE	*pfile2;
	char	acBuf1[BUFFER_SIZE];
	char	acBuf2[BUFFER_SIZE];
	int	iRead1;
	int	iRead2;
	int	iRetVal;

pfile1 = fopen(pcFile1, "rb");
	if (pfile1 == NULL) {
		fprintf(stderr, "error: fopen(%s)\n", pcFile1);
		return -1;
	}

pfile2 = fopen(pcFile2, "rb");
	if (pfile2 == NULL) {
		fprintf(stderr, "error: fopen(%s)\n", pcFile2);
		fclose(pfile1);
		return -1;
	}

iRetVal = 0;
	do {
		iRead1 = fread(acBuf1, sizeof(char), BUFFER_SIZE, pfile1);
		iRead2 = fread(acBuf2, sizeof(char), BUFFER_SIZE, pfile2);
		if (iRead1 != iRead2) {
			iRetVal = 1;
			break;
		}
		if (memcmp(acBuf1, acBuf2, iRead1) != 0) {
			iRetVal = 1;
			break;
		}
	} while (iRead1 == BUFFER_SIZE);

fclose(pfile2);
	fclose(pfile1);
	return iRetVal;
}