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
  34 static const char more_usage[] = "more [file ...]\n";
  35
  36 /* ED: sparc termios is broken: revert back to old termio handling. */
  37 #ifdef BB_FEATURE_USE_TERMIOS
  38
  39 #if #cpu(sparc)
  40 #      include <termio.h>
  41 #      define termios termio
  42 #      define setTermSettings(fd,argp) ioctl(fd,TCSETAF,argp)
  43 #      define getTermSettings(fd,argp) ioctl(fd,TCGETA,argp)
  44 #else
  45 #      include <termios.h>
  46 #      define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
  47 #      define getTermSettings(fd,argp) tcgetattr(fd, argp);
  48 #endif
  49
  50 FILE *cin;
  51
  52 struct termios initial_settings, new_settings;
  53
  54 void gotsig(int sig)
  55 {
  56         setTermSettings(fileno(cin), &initial_settings);
  57         fprintf(stdout, "\n");
  58         exit(TRUE);
  59 }
  60 #endif
  61
  62
  63
  64 #define TERMINAL_WIDTH  79              /* not 80 in case terminal has linefold bug */
  65 #define TERMINAL_HEIGHT 24
  66
  67
  68 #if defined BB_FEATURE_AUTOWIDTH
  69 #ifdef BB_FEATURE_USE_TERMIOS
  70 static int terminal_width = 0;
  71 #endif
  72 static int terminal_height = 0;
  73 #else
  74 #define terminal_width  TERMINAL_WIDTH
  75 #define terminal_height TERMINAL_HEIGHT
  76 #endif
  77
  78
  79
  80 extern int more_main(int argc, char **argv)
  81 {
  82         int c, lines = 0, input = 0;
  83         int next_page = 0;
  84         struct stat st;
  85         FILE *file;
  86
  87 #if defined BB_FEATURE_AUTOWIDTH && defined BB_FEATURE_USE_TERMIOS
  88         struct winsize win = { 0, 0 };
  89 #endif
  90
  91         argc--;
  92         argv++;
  93
  94         if (argc > 0
  95                 && (strcmp(*argv, "--help") == 0 || strcmp(*argv, "-h") == 0)) {
  96                 usage(more_usage);
  97         }
  98         do {
  99                 if (argc == 0) {
 100                         file = stdin;
 101                 } else
 102                         file = fopen(*argv, "r");
 103
 104                 if (file == NULL) {
 105                         perror(*argv);
 106                         exit(FALSE);
 107                 }
 108                 fstat(fileno(file), &st);
 109
 110 #ifdef BB_FEATURE_USE_TERMIOS
 111                 cin = fopen("/dev/tty", "r");
 112                 if (!cin)
 113                         cin = fopen("/dev/console", "r");
 114                 getTermSettings(fileno(cin), &initial_settings);
 115                 new_settings = initial_settings;
 116                 new_settings.c_cc[VMIN] = 1;
 117                 new_settings.c_cc[VTIME] = 0;
 118                 new_settings.c_lflag &= ~ICANON;
 119                 new_settings.c_lflag &= ~ECHO;
 120                 setTermSettings(fileno(cin), &new_settings);
 121
 122 #ifdef BB_FEATURE_AUTOWIDTH
 123                 ioctl(fileno(stdout), TIOCGWINSZ, &win);
 124                 if (win.ws_row > 4)
 125                         terminal_height = win.ws_row - 2;
 126                 if (win.ws_col > 0)
 127                         terminal_width = win.ws_col - 1;
 128 #endif
 129
 130                 (void) signal(SIGINT, gotsig);
 131                 (void) signal(SIGQUIT, gotsig);
 132                 (void) signal(SIGTERM, gotsig);
 133
 134 #endif
 135                 while ((c = getc(file)) != EOF) {
 136                         if (next_page) {
 137                                 int len = 0;
 138
 139                                 next_page = 0;
 140                                 lines = 0;
 141                                 len = fprintf(stdout, "--More-- ");
 142                                 if (file != stdin) {
 143                                         len += fprintf(stdout, "(%d%% of %ld bytes)",
 144                                                                    (int) (100 *
 145                                                                                   ((double) ftell(file) /
 146                                                                                    (double) st.st_size)),
 147                                                                    st.st_size);
 148                                 }
 149                                 len += fprintf(stdout, "%s",
 150 #ifdef BB_FEATURE_USE_TERMIOS
 151                                                            ""
 152 #else
 153                                                            "\n"
 154 #endif
 155                                         );
 156
 157                                 fflush(stdout);
 158 #ifdef BB_FEATURE_USE_TERMIOS
 159                                 input = getc(cin);
 160 #else
 161                                 input = getc(stdin);
 162 #endif
 163
 164 #ifdef BB_FEATURE_USE_TERMIOS
 165                                 /* Erase the "More" message */
 166                                 while (--len >= 0)
 167                                         putc('\b', stdout);
 168                                 while (++len <= terminal_width)
 169                                         putc(' ', stdout);
 170                                 while (--len >= 0)
 171                                         putc('\b', stdout);
 172                                 fflush(stdout);
 173 #endif
 174
 175                         }
 176                         if (c == '\n') {
 177                                 switch (input) {
 178                                 case 'q':
 179                                         goto end;
 180                                 case '\n':
 181                                         /* increment by just one line if we are at
 182                                          * the end of this line*/
 183                                         next_page = 1;
 184                                         break;
 185                                 }
 186                                 if (++lines == terminal_height)
 187                                         next_page = 1;
 188                         }
 189                         putc(c, stdout);
 190                 }
 191                 fclose(file);
 192                 fflush(stdout);
 193
 194                 argv++;
 195         } while (--argc > 0);
 196   end:
 197 #ifdef BB_FEATURE_USE_TERMIOS
 198         gotsig(0);
 199 #endif
 200         exit(TRUE);
 201 }