freebsd-dev/eBones/krb/getst.c

/*
 * Copyright 1987, 1988 by the Massachusetts Institute of Technology.
 * For copying and distribution information, please see the file
 * <Copyright.MIT>.
 *
 *	form: getst.c,v 4.5 88/11/15 16:31:39 jtkohl Exp $
 *	$Id: getst.c,v 1.3 1995/07/18 16:38:47 mark Exp $
 */

#if 0
#ifndef lint
static char rcsid[] =
"$Id: getst.c,v 1.3 1995/07/18 16:38:47 mark Exp $";
#endif /* lint */
#endif

#include <unistd.h>

/*
 * getst() takes a file descriptor, a string and a count.  It reads
 * from the file until either it has read "count" characters, or until
 * it reads a null byte.  When finished, what has been read exists in
 * the given string "s".  If "count" characters were actually read, the
 * last is changed to a null, so the returned string is always null-
 * terminated.  getst() returns the number of characters read, including
 * the null terminator.
 */

int getst(int fd, char *s, int n)
{
    register count = n;
    while (read(fd, s, 1) > 0 && --count)
        if (*s++ == '\0')
            return (n - count);
    *s = '\0';
    return (n - count);
}