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

char fin[], fon[];

void parsefiles(argc, argv, iex, oex, parm)
	int	argc;
	char	**argv;
	char	*iex;
	char	*oex;
	int	*parm;
{
	register char *p;
	register char *q;
	char *d;
	int file2;

	if (argc < 2 || argc > 4 || (parm == 0 && argc > 3)) {
		if (parm == 0) {
			fprintf(stderr, "Usage: %s2%s <infile> [<outfile>]\n",
				iex, oex);
		} else {
			fprintf(stderr,
	 "Usage: %s2%s <infile> [<outfile>] [<record len>, default %d]\n",
				iex, oex, *parm);
		}
		exit(1);
	}
	d = 0;
	q = fin;
	for (p = argv[1]; *p; p++) {
		*q++ = *p;
		if (*p == '.')
			d = q;
		else if (*p == '\\')
			d = 0;
	}
	if (d == 0) {
		*q++ = '.';
		d = q;
		for (p = iex; *p; p++)
			*q++ = *p;
	}
	*q++ = 0;

	file2 = 0;
	if (argc > 2) {
		if (parm) {
			int	v = 0;

			for (q = argv[argc-1]; *q; q++) {
				if (*q >= '0' && *q <= '9') {
					v = 10*v + *q - '0';
				} else {
					if (argc == 3) {
						file2 = 1;
						goto getfile;
					} else {
						fprintf(stderr, "Invalid number\n");
						exit(1);
					}
				}
			}
			*parm = v;
			if (argc > 3) {
				file2 = 1;
			}
		} else {
			file2 = 1;
		}
	}
getfile:

	q = fon;
	if (!file2) {
		for (p = fin; p < d; p++)
			*q++ = *p;
		for (p = oex; *p; p++)
			*q++ = *p;
		*q++ = 0;
	} else {
		d = 0;
		for (p = argv[2]; *p; p++) {
			*q++ = *p;
			if (*p == '.')
				d = q;
			else if (*p == '\\')
				d = 0;
		}
		if (d == 0) {
			*q++ = '.';
			d = q;
			for (p = oex; *p; p++)
				*q++ = *p;
		}
		*q++ = 0;
	}
}