/*
 * main.c - call sortfile() (any version of sortfile()) on two files, with
 *          file names input by the user.
 *
 * Alan J Rosenthal, November 2000.
 */

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


int main()
{
    char filename[100];
    FILE *in, *out;
    extern void sortfile(FILE *in, FILE *out);
    extern void myget(char *prompt, char *s, int size);

    /* get filenames and open files */
    myget("Input file: ", filename, sizeof filename);
    if ((in = fopen(filename, "r")) == NULL) {
	perror(filename);
	return 1;
    }
    myget("Output file: ", filename, sizeof filename);
    if ((out = fopen(filename, "w")) == NULL) {
	perror(filename);
	return 1;
    }

    /* call sortfile on 'em; files closed upon program exit */
    sortfile(in, out);

    return 0;
}


void myget(char *prompt, char *s, int size)
{
    char *p;

    printf("%s", prompt);
    if (fgets(s, size, stdin) == NULL)
	exit(0);
    if ((p = strchr(s, '\n')) != NULL)
	*p = '\0';
}