Centaur | Reader

Reader (main.c) https://www.centaur.pw/software/md5/main.c [Direct Link]
/* Centaur MD5
 *
 * Version 3.0
 * 4/7/2024
 *
 * Main program
 *
 * main.c
 */

#include <ctype.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <openssl/md5.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>

#include "color.h"
#include "md5.h"

#define _USAGE "Usage:  %s <file ...>\n\t%s -u <file ...>\n\t%s -L <file>\n\t%s -f <checksum-file>\n\t%s -s/-S '<string>'\n"

int main(int argc, char **argv)
{
	if (argc < 2)
	{
		printf(_USAGE, argv[0], argv[0], argv[0], argv[0], argv[0]);
		exit(1);
	}

	static int u = 0;
	if (argc > 2 && !strcmp(argv[1], "-u")) u = 1; else u = 0;

	if (((!strcmp(argv[1], "-f") || !strcmp(argv[1], "--file")) && argc == 3))
	{
		int s;
		int ok = 0, failed = 0, files = 0;

		s = valid_md5_file(argv[2]);
	
		if (s == 0)
		{
			printf("%s: %s: not a valid MD5 checksum file\n", argv[0], argv[2]);
			exit(1);
		}
		else if (s == -1)
		{
			printf("%s: %s: file access error\n", argv[0], argv[2]);
			exit(1);
		}
		else if (s == -2)
		{
			printf("%s: %s: is a directory\n", argv[0], argv[2]);
			exit(1);
		}

		FILE *fptr;
		char md5[33];
		char file[64];

		fptr = fopen(argv[2], "r");

		rewind(fptr);

		while (1)
		{
			fscanf(fptr, "%s  %s", md5, file);
			if (feof(fptr))
			{
				break;
			}
			files++;
			strcpy(r, md5file(file, u));

			if (!strcmp(r, "(directory)"))
			{
				printf("%s: %s%sIS A DIRECTORY%s\n", file, BOLD, RED, RESET);
				failed++;
			}
			else if (!strcmp(r, "(file access error)"))
			{
				printf("%s: %s%sFILE ACCESS ERROR%s\n", file, BOLD, RED, RESET);
				failed++;
			}
			else if (!hashcompare(md5, r))
			{
				printf("%s: %s%sOK%s\n", file, BOLD, GREEN, RESET);
				ok++;
			}
			else
			{
				printf("%s: %s%sFAILED%s\n", file, BOLD, RED, RESET);
				failed++;
			}
		}

		fclose(fptr);
		printf("\n%d files processed\n%d %s%spassed%s\n%d %s%sfailed%s\n", files, ok, BOLD, GREEN, RESET, failed, BOLD, RED, RESET);
		exit(0);
	}

	int a;
	for (a = 0; a <= (argc - 1); a++)
	{
		if (argc == 3 && !strcmp(argv[1], "-s"))
		{
			strcpy(r, md5string(argv[2], 0));
			printf("%s\n", r);
			exit(0);
		}
		else if (argc == 3 && !strcmp(argv[1], "-S"))
		{
			strcpy(r, md5string(argv[2], 1));
			printf("%s\n", r);
			exit(0);
		}
		else if (argc == 3 && !strcmp(argv[1], "-L"))
		{
			strcpy(r, md5file(argv[2], 0));
			printf("%s\n", r);
			exit(0);
		}
		else if (argc > 3 && (!strcmp(argv[1], "-s") || !strcmp(argv[1], "-S") || !strcmp(argv[1], "-L")))
		{
			printf("%s: too many arguments used with option %s\n", argv[0], argv[1]);
			exit(1);
		}
	}

	int b;

	if (argc >= 2)
	{
		if (!strcmp(argv[1], "-u"))
		{
			for (b = 2; b <= argc - 1; b++)
			{
				strcpy(r, md5file(argv[b], 1));
				printf("%s  %s\n", r, argv[b]);
			}
			exit(0);
		}
		for (b = 1; b <= (argc - 1); b++)
		{
			strcpy(r, md5file(argv[b], u));
			printf("%s  %s\n", r, argv[b]);
		}
		exit(0);
	}
	else
	{
		printf(_USAGE, argv[0], argv[0], argv[0], argv[0], argv[0]);
		exit(1);
	}
	exit(1);
}