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/*
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 * Copyright (c) 2009, Kohsuke Ohtani
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the author nor the names of any co-contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/termios.h>
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#include <sys/ioctl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <err.h>
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#ifdef CMDBOX
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#define main(argc, argv)        more_main(argc, argv)
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#endif
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static void do_more(FILE *, int);
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int
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main(int argc, char *argv[])
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{
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        struct winsize ws;
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        int ch;
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        FILE *fp = NULL;
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        int height = 25;
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        int rval = 0;
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        while ((ch = getopt(argc, argv, "")) != -1)
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                switch(ch) {
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                case '?':
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                default:
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                        fprintf(stderr, "usage: more [file ...]\n");
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                        exit(1);
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                        /* NOTREACHED */
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                }
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        argc -= optind;
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        argv += optind;
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        if (ioctl(0, TIOCGWINSZ, &ws) == 0)
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                height = (int)ws.ws_row;
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        if (*argv) {
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                for (; *argv; ++argv) {
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                        if ((fp = fopen(*argv, "r")) == NULL) {
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                                warn("%s", *argv);
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                                ++argv;
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                                rval = 1;
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                                continue;
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                        }
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                        do_more(fp, height);
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                        (void)fclose(fp);
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                }
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        } else
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                do_more(stdin, height);
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        exit(rval);
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}
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static void
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do_more(FILE *fp, int maxlines)
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{
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        int c, len, lines = 0;
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        while ((c = getc(fp)) != EOF) {
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                if (c == '\n' && ++lines >= maxlines) {
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                        len = printf("\n--More-- ");
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                        fflush(stdout);
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                        read(2, &c, 1);
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                        printf("\033[1A"); /* up cursor */
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                        putc('\r', stdout);
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                        while (--len >= 0)
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                                putc(' ', stdout);
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                        putc('\r', stdout);
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                        len = 0;
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                        lines = 0;
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                } else
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                        putchar(c);
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        }
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        putchar('\n');
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}