1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini more implementation for busybox
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4 | *
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5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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7 | *
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8 | * Latest version blended together by Erik Andersen <andersen@codepoet.org>,
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9 | * based on the original more implementation by Bruce, and code from the
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10 | * Debian boot-floppies team.
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11 | *
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12 | * Termios corrects by Vladimir Oleynik <dzo@simtreas.ru>
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13 | *
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14 | * This program is free software; you can redistribute it and/or modify
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15 | * it under the terms of the GNU General Public License as published by
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16 | * the Free Software Foundation; either version 2 of the License, or
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17 | * (at your option) any later version.
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18 | *
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19 | * This program is distributed in the hope that it will be useful,
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20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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22 | * General Public License for more details.
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23 | *
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24 | * You should have received a copy of the GNU General Public License
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25 | * along with this program; if not, write to the Free Software
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26 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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27 | *
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28 | */
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29 |
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30 | #include <stdio.h>
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31 | #include <fcntl.h>
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32 | #include <signal.h>
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33 | #include <stdlib.h>
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34 | #include <unistd.h>
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35 | #include <sys/ioctl.h>
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36 | #include "busybox.h"
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37 |
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38 |
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39 | #ifdef CONFIG_FEATURE_USE_TERMIOS
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40 | static int cin_fileno;
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41 | #include <termios.h>
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42 | #define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
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43 | #define getTermSettings(fd,argp) tcgetattr(fd, argp);
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44 |
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45 | static struct termios initial_settings, new_settings;
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46 |
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47 | static void set_tty_to_initial_mode(void)
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48 | {
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49 | setTermSettings(cin_fileno, &initial_settings);
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50 | }
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51 |
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52 | static void gotsig(int sig)
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53 | {
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54 | putchar('\n');
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55 | exit(EXIT_FAILURE);
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56 | }
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57 | #endif /* CONFIG_FEATURE_USE_TERMIOS */
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58 |
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59 |
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60 | int more_main(int argc, char **argv)
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61 | {
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62 | int c, lines, input = 0;
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63 | int please_display_more_prompt = 0;
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64 | struct stat st;
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65 | FILE *file;
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66 | FILE *cin;
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67 | int len, page_height;
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68 | int terminal_width;
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69 | int terminal_height;
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70 |
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71 | argc--;
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72 | argv++;
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73 |
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74 |
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75 | /* not use inputing from terminal if usage: more > outfile */
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76 | if(isatty(STDOUT_FILENO)) {
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77 | cin = fopen(CURRENT_TTY, "r");
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78 | if (!cin)
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79 | cin = bb_xfopen(CONSOLE_DEV, "r");
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80 | please_display_more_prompt = 2;
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81 | #ifdef CONFIG_FEATURE_USE_TERMIOS
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82 | cin_fileno = fileno(cin);
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83 | getTermSettings(cin_fileno, &initial_settings);
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84 | new_settings = initial_settings;
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85 | new_settings.c_lflag &= ~ICANON;
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86 | new_settings.c_lflag &= ~ECHO;
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87 | new_settings.c_cc[VMIN] = 1;
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88 | new_settings.c_cc[VTIME] = 0;
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89 | setTermSettings(cin_fileno, &new_settings);
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90 | atexit(set_tty_to_initial_mode);
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91 | (void) signal(SIGINT, gotsig);
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92 | (void) signal(SIGQUIT, gotsig);
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93 | (void) signal(SIGTERM, gotsig);
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94 | #endif
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95 | } else {
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96 | cin = stdin;
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97 | }
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98 |
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99 | do {
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100 | if (argc == 0) {
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101 | file = stdin;
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102 | } else
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103 | file = bb_wfopen(*argv, "r");
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104 | if(file==0)
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105 | goto loop;
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106 |
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107 | st.st_size = 0;
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108 | fstat(fileno(file), &st);
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109 |
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110 | please_display_more_prompt &= ~1;
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111 |
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112 | get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
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113 | if (terminal_height > 4)
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114 | terminal_height -= 2;
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115 | if (terminal_width > 0)
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116 | terminal_width -= 1;
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117 |
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118 | len=0;
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119 | lines = 0;
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120 | page_height = terminal_height;
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121 | while ((c = getc(file)) != EOF) {
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122 |
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123 | if ((please_display_more_prompt & 3) == 3) {
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124 | len = printf("--More-- ");
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125 | if (file != stdin && st.st_size > 0) {
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126 | #if _FILE_OFFSET_BITS == 64
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127 | len += printf("(%d%% of %lld bytes)",
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128 | (int) (100 * ((double) ftell(file) /
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129 | (double) st.st_size)), (long long)st.st_size);
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130 | #else
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131 | len += printf("(%d%% of %ld bytes)",
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132 | (int) (100 * ((double) ftell(file) /
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133 | (double) st.st_size)), (long)st.st_size);
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134 | #endif
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135 | }
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136 |
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137 | fflush(stdout);
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138 |
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139 | /*
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140 | * We've just displayed the "--More--" prompt, so now we need
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141 | * to get input from the user.
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142 | */
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143 | input = getc(cin);
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144 | #ifndef CONFIG_FEATURE_USE_TERMIOS
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145 | printf("\033[A"); /* up cursor */
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146 | #endif
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147 | /* Erase the "More" message */
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148 | putc('\r', stdout);
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149 | while (--len >= 0)
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150 | putc(' ', stdout);
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151 | putc('\r', stdout);
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152 | len=0;
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153 | lines = 0;
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154 | page_height = terminal_height;
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155 | please_display_more_prompt &= ~1;
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156 |
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157 | if (input == 'q')
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158 | goto end;
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159 | }
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160 |
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161 | /*
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162 | * There are two input streams to worry about here:
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163 | *
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164 | * c : the character we are reading from the file being "mored"
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165 | * input : a character received from the keyboard
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166 | *
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167 | * If we hit a newline in the _file_ stream, we want to test and
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168 | * see if any characters have been hit in the _input_ stream. This
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169 | * allows the user to quit while in the middle of a file.
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170 | */
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171 | if (c == '\n') {
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172 | /* increment by just one line if we are at
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173 | * the end of this line */
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174 | if (input == '\n')
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175 | please_display_more_prompt |= 1;
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176 | /* Adjust the terminal height for any overlap, so that
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177 | * no lines get lost off the top. */
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178 | if (len >= terminal_width) {
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179 | int quot, rem;
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180 | quot = len / terminal_width;
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181 | rem = len - (quot * terminal_width);
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182 | if (quot) {
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183 | if (rem)
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184 | page_height-=quot;
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185 | else
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186 | page_height-=(quot-1);
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187 | }
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188 | }
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189 | if (++lines >= page_height) {
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190 | please_display_more_prompt |= 1;
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191 | }
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192 | len=0;
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193 | }
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194 | /*
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195 | * If we just read a newline from the file being 'mored' and any
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196 | * key other than a return is hit, scroll by one page
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197 | */
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198 | putc(c, stdout);
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199 | len++;
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200 | }
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201 | fclose(file);
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202 | fflush(stdout);
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203 | loop:
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204 | argv++;
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205 | } while (--argc > 0);
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206 | end:
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207 | return 0;
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208 | }
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