/* D2U, converts DOS textfiles to UNIX */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define FALSE	0
#define TRUE 	1

int translate = FALSE;


unsigned char pc2latin1[256] = 
{
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 0, 0, 0, 0, 182, 167, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 0,
 199, 252, 233, 226, 228, 224, 229, 231, 234, 235, 232, 239, 238, 236, 196, 197,
 201, 230, 198, 244, 246, 242, 251, 249, 255, 214, 220, 162, 163, 165, 000, 000,
 225, 237, 243, 250, 241, 209, 170, 186, 191, 000, 172, 189, 188, 161, 171, 187,
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 0, 223, 0, 0, 0, 0, 181, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 0, 177, 0, 0, 0, 0, 247, 0, 176, 0, 183, 0, 0, 178, 0, 160
};	



main(int argc, char **argv)
{
	int i;

	if(! getopts(argc, argv))
		exit(1);
	
	if(argc > 1) {
		for(i = optind; i < argc ; i++)
			convert(argv[i]);
		printf("\nConversion finished.\n\n");
	} else {
		printf("D2U  Converts textfiles from DOS to UNIX\n");
		printf("usage: d2u [-t] <filename>\n\n"); 
     		exit(0);
	}
}


convert(char *fname)
{
	FILE* f_in;
	FILE* f_out;
	char tmpname[80];
	unsigned char c;

	if(! (f_in = fopen(fname, "r"))) {
		fprintf(stderr, "\nError: couldn't find %s\n\n", fname);
		return;		
	}
	
	printf("Converting %s...\n", fname);

	strcpy(tmpname, tempnam(NULL, "d2u"));		
	f_out = fopen(tmpname, "w");		
		
	while(fread(&c, 1, 1, f_in)) {
		if((translate) && (c >= 32)) {
			c = pc2latin1[c];
			if(c == 0)
				c = 32;
		}
		if(c != 13)
			fwrite(&c, 1, 1, f_out);
	}

	remove(fname);
	rename(tmpname, fname);
	remove(tmpname);		

	fclose(f_in);
	fclose(f_out);
}


getopts(int argc, char **argv)
{
	int c;
	opterr = 0;
	
	while((c = getopt(argc, argv, "t")) != -1) {
		switch(c) {
			case 't':
				translate = TRUE;
				break;
			case '?':
				if(isprint(optopt))
					fprintf(stderr, "Unknown option '-%c'.\n", optopt);
				else
					fprintf(stderr, "Unknown option character '\\x%x'.\n", optopt);
				return 0;	
			default:
				abort();
		}
	}
	return 1;
}
.