more.c

   1 #include "internal.h"
   2 #include <stdio.h>
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <sys/ioctl.h>
   6 #include <fcntl.h>
   7
   8 #define BB_MORE_TERM
   9
  10 #ifdef BB_MORE_TERM
  11         #include <termios.h>
  12         #include <signal.h>
  13
  14         FILE *cin;
  15         struct termios initial_settings, new_settings;
  16
  17         void gotsig(int sig) {
  18                 tcsetattr(fileno(cin), TCSANOW, &initial_settings);
  19                 exit(0);
  20         }
  21 #endif
  22
  23 const char      more_usage[] = "more [file]\n"
  24 "\n"
  25 "\tDisplays a file, one page at a time.\n"
  26 "\tIf there are no arguments, the standard input is displayed.\n";
  27
  28 extern int
  29 more_fn(const struct FileInfo * i)
  30 {
  31         FILE *  f = stdin;
  32         int     c;
  33         int     lines = 0, tlines = 0;
  34         int     next_page = 0;
  35         int     rows = 24, cols = 79;
  36 #ifdef BB_MORE_TERM
  37         long sizeb = 0;
  38         struct stat st;
  39         struct winsize win;
  40 #endif
  41
  42         if ( i ) {
  43                 if (! (f = fopen(i->source, "r") )) {
  44                         name_and_error(i->source);
  45                         return 1;
  46                 }
  47                 fstat(fileno(f), &st);
  48                 sizeb = st.st_size / 100;
  49         }
  50
  51 #ifdef BB_MORE_TERM
  52         cin = fopen("/dev/tty", "r");
  53         tcgetattr(fileno(cin),&initial_settings);
  54         new_settings = initial_settings;
  55         new_settings.c_lflag &= ~ICANON;
  56         new_settings.c_lflag &= ~ECHO;
  57         tcsetattr(fileno(cin), TCSANOW, &new_settings);
  58
  59         (void) signal(SIGINT, gotsig);
  60
  61         ioctl(STDOUT_FILENO, TIOCGWINSZ, &win);
  62         if (win.ws_row > 4)     rows = win.ws_row - 2;
  63         if (win.ws_col > 0)     cols = win.ws_col - 1;
  64
  65
  66 #endif
  67
  68         while ( (c = getc(f)) != EOF ) {
  69                 if ( next_page ) {
  70                         char    garbage;
  71                         int     len;
  72                         tlines += lines;
  73                         lines = 0;
  74                         next_page = 0;          //Percentage is based on bytes, not lines.
  75                         if ( i && i->source )   //It is not very acurate, but still useful.
  76                                 len = printf("%s - %%%2ld - line: %d", i->source, (ftell(f) - sizeb - sizeb) / sizeb, tlines);
  77                         else
  78                                 len = printf("line: %d", tlines);
  79
  80                         fflush(stdout);
  81 #ifndef BB_MORE_TERM
  82                         read(2, &garbage, 1);
  83 #else
  84                         do {
  85                                 fread(&garbage, 1, 1, cin);
  86                         } while ((garbage != ' ') && (garbage != '\n'));
  87
  88                         if (garbage == '\n') {
  89                                 lines = rows;
  90                                 tlines -= rows;
  91                         }
  92                         garbage = 0;
  93                         //clear line, since tabs don't overwrite.
  94                         while(len-- > 0)        putchar('\b');
  95                         while(len++ < cols)     putchar(' ');
  96                         while(len-- > 0)        putchar('\b');
  97                         fflush(stdout);
  98 #endif
  99                 }
 100                 putchar(c);
 101                 if ( c == '\n' && ++lines == (rows + 1) )
 102                         next_page = 1;
 103         }
 104         if ( f != stdin )
 105                 fclose(f);
 106 #ifdef BB_MORE_TERM
 107         gotsig(0);
 108 #endif
 109         return 0;
 110 }