scoutos / prex-0.9.0 / usr / bin / more / more.c @ 03e9c04a
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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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} |