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root/usr/bin/more/more.c

DEFINITIONS

1. main
2. do_more

   1 /*
   2  * Copyright (c) 2009, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 #include <sys/termios.h>
  31 #include <sys/ioctl.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <unistd.h>
  36 #include <err.h>
  38 #ifdef CMDBOX
  39 #define main(argc, argv)        more_main(argc, argv)
  40 #endif
  42 static void do_more(FILE *, int);
  44 int
main(int argc, char *argv[])
  46 {
  47         struct winsize ws;
  48         int ch;
FILE *fp = NULL;
  50         int height = 25;
  51         int rval = 0;
  53         while ((ch = getopt(argc, argv, "")) != -1)
  54                 switch(ch) {
  55                 case '?':
  56                 default:
fprintf(stderr, "usage: more [file ...]\n");
exit(1);
  59                         /* NOTREACHED */
  60                 }
argc -= optind;
argv += optind;
  64         if (ioctl(0, TIOCGWINSZ, &ws) == 0)
height = (int)ws.ws_row;
  67         if (*argv) {
  68                 for (; *argv; ++argv) {
  69                         if ((fp = fopen(*argv, "r")) == NULL) {
warn("%s", *argv);
  71                                 ++argv;
rval = 1;
  73                                 continue;
  74                         }
do_more(fp, height);
  76                         (void)fclose(fp);
  77                 }
  78         } else
do_more(stdin, height);
exit(rval);
  82 }
  84 static void
do_more(FILE *fp, int maxlines)
  86 {
  87         int c, len, lines = 0;
  89         while ((c = getc(fp)) != EOF) {
  90                 if (c == '\n' && ++lines >= maxlines) {
len = printf("\n--More-- ");
fflush(stdout);
read(2, &c, 1);
printf("\033[1A"); /* up cursor */
putc('\r', stdout);
  97                         while (--len >= 0)
putc(' ', stdout);
putc('\r', stdout);
len = 0;
lines = 0;
 102                 } else
putchar(c);
 104         }
putchar('\n');
 106 }