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    Contents of /trunk/mkinitrd-magellan/busybox/util-linux/more.c

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    Revision 532 - (show annotations) (download)
    Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
    File MIME type: text/plain
    File size: 4333 byte(s) 
    -import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * Mini more implementation for busybox
    4 *
    5 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
    6 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
    7 *
    8 * Latest version blended together by Erik Andersen <andersen@codepoet.org>,
    9 * based on the original more implementation by Bruce, and code from the
    10 * Debian boot-floppies team.
    11 *
    12 * Termios corrects by Vladimir Oleynik <dzo@simtreas.ru>
    13 *
    14 * Licensed under GPLv2 or later, see file License in this tarball for details.
    15 */
    16
    17 #include "busybox.h"
    18
    19
    20 #if ENABLE_FEATURE_USE_TERMIOS
    21 static int cin_fileno;
    22 #include <termios.h>
    23 #define setTermSettings(fd, argp) tcsetattr(fd, TCSANOW, argp)
    24 #define getTermSettings(fd, argp) tcgetattr(fd, argp);
    25
    26 static struct termios initial_settings, new_settings;
    27
    28 static void set_tty_to_initial_mode(void)
    29 {
    30 setTermSettings(cin_fileno, &initial_settings);
    31 }
    32
    33 static void gotsig(int sig)
    34 {
    35 putchar('\n');
    36 exit(EXIT_FAILURE);
    37 }
    38 #endif /* FEATURE_USE_TERMIOS */
    39
    40
    41 int more_main(int argc, char **argv)
    42 {
    43 int c, lines, input = 0;
    44 int please_display_more_prompt = 0;
    45 struct stat st;
    46 FILE *file;
    47 FILE *cin;
    48 int len, page_height;
    49 int terminal_width;
    50 int terminal_height;
    51
    52 argc--;
    53 argv++;
    54
    55 cin = stdin;
    56 /* use input from terminal unless we do "more >outfile" */
    57 if (isatty(STDOUT_FILENO)) {
    58 cin = fopen(CURRENT_TTY, "r");
    59 if (!cin)
    60 cin = xfopen(CONSOLE_DEV, "r");
    61 please_display_more_prompt = 2;
    62 #if ENABLE_FEATURE_USE_TERMIOS
    63 cin_fileno = fileno(cin);
    64 getTermSettings(cin_fileno, &initial_settings);
    65 new_settings = initial_settings;
    66 new_settings.c_lflag &= ~ICANON;
    67 new_settings.c_lflag &= ~ECHO;
    68 new_settings.c_cc[VMIN] = 1;
    69 new_settings.c_cc[VTIME] = 0;
    70 setTermSettings(cin_fileno, &new_settings);
    71 atexit(set_tty_to_initial_mode);
    72 signal(SIGINT, gotsig);
    73 signal(SIGQUIT, gotsig);
    74 signal(SIGTERM, gotsig);
    75 #endif
    76 }
    77
    78 do {
    79 file = stdin;
    80 if (argc != 0) {
    81 file = fopen_or_warn(*argv, "r");
    82 if (!file)
    83 goto loop;
    84 }
    85
    86 st.st_size = 0;
    87 fstat(fileno(file), &st);
    88
    89 please_display_more_prompt &= ~1;
    90
    91 get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
    92 if (terminal_height > 4)
    93 terminal_height -= 2;
    94 if (terminal_width > 0)
    95 terminal_width -= 1;
    96
    97 len = 0;
    98 lines = 0;
    99 page_height = terminal_height;
    100 while ((c = getc(file)) != EOF) {
    101
    102 if ((please_display_more_prompt & 3) == 3) {
    103 len = printf("--More-- ");
    104 if (file != stdin && st.st_size > 0) {
    105 len += printf("(%d%% of %"OFF_FMT"d bytes)",
    106 (int) (ftello(file)*100 / st.st_size),
    107 st.st_size);
    108 }
    109 fflush(stdout);
    110
    111 /*
    112 * We've just displayed the "--More--" prompt, so now we need
    113 * to get input from the user.
    114 */
    115 input = getc(cin);
    116 #if !ENABLE_FEATURE_USE_TERMIOS
    117 printf("\033[A"); /* up cursor */
    118 #endif
    119 /* Erase the "More" message */
    120 printf("\r%*s\r", len, "");
    121 len = 0;
    122 lines = 0;
    123 page_height = terminal_height;
    124 please_display_more_prompt &= ~1;
    125
    126 if (input == 'q')
    127 goto end;
    128 }
    129
    130 /*
    131 * There are two input streams to worry about here:
    132 *
    133 * c : the character we are reading from the file being "mored"
    134 * input : a character received from the keyboard
    135 *
    136 * If we hit a newline in the _file_ stream, we want to test and
    137 * see if any characters have been hit in the _input_ stream. This
    138 * allows the user to quit while in the middle of a file.
    139 */
    140 if (c == '\n') {
    141 /* increment by just one line if we are at
    142 * the end of this line */
    143 if (input == '\n')
    144 please_display_more_prompt |= 1;
    145 /* Adjust the terminal height for any overlap, so that
    146 * no lines get lost off the top. */
    147 if (len >= terminal_width) {
    148 int quot, rem;
    149 quot = len / terminal_width;
    150 rem = len - (quot * terminal_width);
    151 if (quot) {
    152 if (rem)
    153 page_height -= quot;
    154 else
    155 page_height -= (quot - 1);
    156 }
    157 }
    158 if (++lines >= page_height) {
    159 please_display_more_prompt |= 1;
    160 }
    161 len = 0;
    162 }
    163 /*
    164 * If we just read a newline from the file being 'mored' and any
    165 * key other than a return is hit, scroll by one page
    166 */
    167 putc(c, stdout);
    168 len++;
    169 }
    170 fclose(file);
    171 fflush(stdout);
    172 loop:
    173 argv++;
    174 } while (--argc > 0);
    175 end:
    176 return 0;
    177 }