hexdmp

hexdmp.c

/*
0         1         2         3         4         5         6         7
01234567890123456789012345678901234567890123456789012345678901234567890123456789
HHHHHHHH  HH HH HH HH-HH HH HH HH-HH HH HH HH-HH HH HH HH  XXXXXXXXXXXXXXXX
*/

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

typedef unsigned char u_char;

int main(int argc, char* argv[])
{
	FILE*	pFile;
	u_char	aucBuf[16];
	u_char	uc;
	char	acLine[80];
	char	acTmp[8+1];
	int		iCount;
	int		iRead;
	int		i;

if (argc != 2) {
		fprintf(stderr, "usage: hexdmp file\n");
		return 1;
	}

if (fopen_s(&pFile, argv[1], "rb") != 0) {
		fprintf(stderr, "fopen_s error\n");
		return 1;
	}

for (iCount = 0; ; iCount += 16) {
		iRead = fread(aucBuf, 1, 16, pFile);
		if (iRead <= 0) {
			break;
		}
		strcpy_s(acLine, sizeof acLine,
			"                     -           -           -                             ");
		sprintf_s(acTmp, sizeof acTmp, "%.8X", iCount);
		memcpy(acLine, acTmp, 8);
		for (i = 0; i < iRead; i++) {
			uc = aucBuf[i];
			sprintf_s(acTmp, sizeof acTmp, "%.2X", uc);
			memcpy(acLine + 10 + i * 3, acTmp, 2);
			if (isprint(uc) == 0) {
				uc = '.';
			}
			acLine[59 + i] = uc;
		}
		puts(acLine);
		if (iRead != 16) {
			break;
		}
	}

fclose(pFile);
	return 0;
}