more.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini more implementation for busybox
   4  *
   5  *
   6  * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
   7  *
   8  * Latest version blended together by Erik Andersen <andersen@lineo.com>,
   9  * based on the original more implementation by Bruce, and code from the
  10  * Debian boot-floppies team.
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  20  * General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  *
  26  */
  27
  28 #include "internal.h"
  29 #include <stdio.h>
  30 #include <fcntl.h>
  31 #include <signal.h>
  32 #include <sys/ioctl.h>
  33 #define BB_DECLARE_EXTERN
  34 #define bb_need_help
  35 #include "messages.c"
  36
  37 static const char more_usage[] = "more [FILE ...]\n"
  38 #ifndef BB_FEATURE_TRIVIAL_HELP
  39         "\nMore is a filter for viewing FILE one screenful at a time.\n"
  40 #endif
  41         ;
  42
  43 /* ED: sparc termios is broken: revert back to old termio handling. */
  44 #ifdef BB_FEATURE_USE_TERMIOS
  45
  46 #if #cpu(sparc)
  47 #      include <termio.h>
  48 #      define termios termio
  49 #      define setTermSettings(fd,argp) ioctl(fd,TCSETAF,argp)
  50 #      define getTermSettings(fd,argp) ioctl(fd,TCGETA,argp)
  51 #else
  52 #      include <termios.h>
  53 #      define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
  54 #      define getTermSettings(fd,argp) tcgetattr(fd, argp);
  55 #endif
  56
  57 FILE *cin;
  58
  59 struct termios initial_settings, new_settings;
  60
  61 void gotsig(int sig)
  62 {
  63         setTermSettings(fileno(cin), &initial_settings);
  64         fprintf(stdout, "\n");
  65         exit(TRUE);
  66 }
  67 #endif
  68
  69
  70
  71 #define TERMINAL_WIDTH  79              /* not 80 in case terminal has linefold bug */
  72 #define TERMINAL_HEIGHT 24
  73
  74
  75 #if defined BB_FEATURE_AUTOWIDTH
  76 #ifdef BB_FEATURE_USE_TERMIOS
  77 static int terminal_width = TERMINAL_WIDTH;
  78 #endif
  79 static int terminal_height = TERMINAL_HEIGHT;
  80 #else
  81 #define terminal_width  TERMINAL_WIDTH
  82 #define terminal_height TERMINAL_HEIGHT
  83 #endif
  84
  85
  86
  87 extern int more_main(int argc, char **argv)
  88 {
  89         int c, lines = 0, input = 0;
  90         int next_page = 0;
  91         struct stat st;
  92         FILE *file;
  93
  94 #if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS
  95         struct winsize win = { 0, 0 };
  96 #endif
  97
  98         argc--;
  99         argv++;
 100
 101         if (argc > 0
 102                 && (strcmp(*argv, dash_dash_help) == 0 || strcmp(*argv, "-h") == 0)) {
 103                 usage(more_usage);
 104         }
 105         do {
 106                 if (argc == 0) {
 107                         file = stdin;
 108                 } else
 109                         file = fopen(*argv, "r");
 110
 111                 if (file == NULL) {
 112                         perror(*argv);
 113                         exit(FALSE);
 114                 }
 115                 fstat(fileno(file), &st);
 116
 117 #ifdef BB_FEATURE_USE_TERMIOS
 118                 cin = fopen("/dev/tty", "r");
 119                 if (!cin)
 120                         cin = fopen("/dev/console", "r");
 121                 getTermSettings(fileno(cin), &initial_settings);
 122                 new_settings = initial_settings;
 123                 new_settings.c_cc[VMIN] = 1;
 124                 new_settings.c_cc[VTIME] = 0;
 125                 new_settings.c_lflag &= ~ICANON;
 126                 new_settings.c_lflag &= ~ECHO;
 127                 setTermSettings(fileno(cin), &new_settings);
 128
 129 #ifdef BB_FEATURE_AUTOWIDTH
 130                 ioctl(fileno(stdout), TIOCGWINSZ, &win);
 131                 if (win.ws_row > 4)
 132                         terminal_height = win.ws_row - 2;
 133                 if (win.ws_col > 0)
 134                         terminal_width = win.ws_col - 1;
 135 #endif
 136
 137                 (void) signal(SIGINT, gotsig);
 138                 (void) signal(SIGQUIT, gotsig);
 139                 (void) signal(SIGTERM, gotsig);
 140
 141 #endif
 142                 while ((c = getc(file)) != EOF) {
 143                         if (next_page) {
 144                                 int len = 0;
 145
 146                                 next_page = 0;
 147                                 lines = 0;
 148                                 len = fprintf(stdout, "--More-- ");
 149                                 if (file != stdin) {
 150                                         len += fprintf(stdout, "(%d%% of %ld bytes)",
 151                                                                    (int) (100 *
 152                                                                                   ((double) ftell(file) /
 153                                                                                    (double) st.st_size)),
 154                                                                    st.st_size);
 155                                 }
 156                                 len += fprintf(stdout, "%s",
 157 #ifdef BB_FEATURE_USE_TERMIOS
 158                                                            ""
 159 #else
 160                                                            "\n"
 161 #endif
 162                                         );
 163
 164                                 fflush(stdout);
 165 #ifdef BB_FEATURE_USE_TERMIOS
 166                                 input = getc(cin);
 167 #else
 168                                 input = getc(stdin);
 169 #endif
 170
 171 #ifdef BB_FEATURE_USE_TERMIOS
 172                                 /* Erase the "More" message */
 173                                 while (--len >= 0)
 174                                         putc('\b', stdout);
 175                                 while (++len <= terminal_width)
 176                                         putc(' ', stdout);
 177                                 while (--len >= 0)
 178                                         putc('\b', stdout);
 179                                 fflush(stdout);
 180 #endif
 181
 182                         }
 183                         if (c == '\n') {
 184                                 switch (input) {
 185                                 case 'q':
 186                                         goto end;
 187                                 case '\n':
 188                                         /* increment by just one line if we are at
 189                                          * the end of this line*/
 190                                         next_page = 1;
 191                                         break;
 192                                 }
 193                                 if (++lines == terminal_height)
 194                                         next_page = 1;
 195                         }
 196                         putc(c, stdout);
 197                 }
 198                 fclose(file);
 199                 fflush(stdout);
 200
 201                 argv++;
 202         } while (--argc > 0);
 203   end:
 204 #ifdef BB_FEATURE_USE_TERMIOS
 205         gotsig(0);
 206 #endif
 207         exit(TRUE);
 208 }