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#include <features.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/stat.h>

char * mktemp(template)

char * template;

{

        int i;

        int num; /* UNINITIALIZED */

        int n2;

        int l = strlen(template);

        struct stat stbuf;

        if (l<6) {

                errno = EINVAL;

                return 0;

        }

        for(i=l-6;i<l;i++)

                if (template[i] != 'X') {

                        errno = EINVAL;

                        return 0;

                }

again:

        n2 = num;

        for(i=l-1;i>=l-6;i--) {

                template[i] = '0' + n2 % 10;

                n2 /= 10;

        }

        if (stat(template, &stbuf) == 0) {

                num++;

                goto again;

        }

        return template;

}