ftp.nice.ch/pub/next/unix/mail/popper.s.tar.gz#/popper/qpopper2.1.1/pop_lower.c

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/*
 * Copyright (c) 1989 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char copyright[] = "Copyright (c) 1990 Regents of the University of California.\nAll rights reserved.\n";
static char SccsId[] = "@(#)@(#)pop_lower.c	2.1  2.1 3/18/91";
#endif not lint

#include <stdio.h>
#include <sys/types.h>
#include <ctype.h>

/* 
 *  lower:  Convert a string to lowercase
 */

pop_lower (buf)
char        *   buf;
{
    char        *   mp;

    for (mp = buf; *mp; mp++)
        if (isupper(*mp) && isupper(*mp)) *mp = (char)tolower((int)*mp);
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.