source: trunk/mindi-busybox/util-linux/more.c @ 956

Last change on this file since 956 was 821, checked in by bruno, 13 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 5.3 KB
Line 
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 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 * General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 *
28 */
29
30#include <stdio.h>
31#include <fcntl.h>
32#include <signal.h>
33#include <stdlib.h>
34#include <unistd.h>
35#include <sys/ioctl.h>
36#include "busybox.h"
37
38
39#ifdef CONFIG_FEATURE_USE_TERMIOS
40static int cin_fileno;
41#include <termios.h>
42#define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
43#define getTermSettings(fd,argp) tcgetattr(fd, argp);
44
45static struct termios initial_settings, new_settings;
46
47static void set_tty_to_initial_mode(void)
48{
49    setTermSettings(cin_fileno, &initial_settings);
50}
51
52static void gotsig(int sig)
53{
54    putchar('\n');
55    exit(EXIT_FAILURE);
56}
57#endif /* CONFIG_FEATURE_USE_TERMIOS */
58
59
60int more_main(int argc, char **argv)
61{
62    int c, lines, input = 0;
63    int please_display_more_prompt = 0;
64    struct stat st;
65    FILE *file;
66    FILE *cin;
67    int len, page_height;
68    int terminal_width;
69    int terminal_height;
70
71    argc--;
72    argv++;
73
74
75    /* not use inputing from terminal if usage: more > outfile */
76    if(isatty(STDOUT_FILENO)) {
77        cin = fopen(CURRENT_TTY, "r");
78        if (!cin)
79            cin = bb_xfopen(CONSOLE_DEV, "r");
80        please_display_more_prompt = 2;
81#ifdef CONFIG_FEATURE_USE_TERMIOS
82        cin_fileno = fileno(cin);
83        getTermSettings(cin_fileno, &initial_settings);
84        new_settings = initial_settings;
85        new_settings.c_lflag &= ~ICANON;
86        new_settings.c_lflag &= ~ECHO;
87        new_settings.c_cc[VMIN] = 1;
88        new_settings.c_cc[VTIME] = 0;
89        setTermSettings(cin_fileno, &new_settings);
90        atexit(set_tty_to_initial_mode);
91        (void) signal(SIGINT, gotsig);
92        (void) signal(SIGQUIT, gotsig);
93        (void) signal(SIGTERM, gotsig);
94#endif
95    } else {
96        cin = stdin;
97    }
98
99    do {
100        if (argc == 0) {
101            file = stdin;
102        } else
103            file = bb_wfopen(*argv, "r");
104        if(file==0)
105            goto loop;
106
107        st.st_size = 0;
108        fstat(fileno(file), &st);
109
110        please_display_more_prompt &= ~1;
111
112        get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
113        if (terminal_height > 4)
114            terminal_height -= 2;
115        if (terminal_width > 0)
116            terminal_width -= 1;
117
118        len=0;
119        lines = 0;
120        page_height = terminal_height;
121        while ((c = getc(file)) != EOF) {
122
123            if ((please_display_more_prompt & 3) == 3) {
124                len = printf("--More-- ");
125                if (file != stdin && st.st_size > 0) {
126#if _FILE_OFFSET_BITS == 64
127                    len += printf("(%d%% of %lld bytes)",
128                           (int) (100 * ((double) ftell(file) /
129                           (double) st.st_size)), (long long)st.st_size);
130#else
131                    len += printf("(%d%% of %ld bytes)",
132                           (int) (100 * ((double) ftell(file) /
133                           (double) st.st_size)), (long)st.st_size);
134#endif
135                }
136
137                fflush(stdout);
138
139                /*
140                 * We've just displayed the "--More--" prompt, so now we need
141                 * to get input from the user.
142                 */
143                input = getc(cin);
144#ifndef CONFIG_FEATURE_USE_TERMIOS
145                printf("\033[A"); /* up cursor */
146#endif
147                /* Erase the "More" message */
148                putc('\r', stdout);
149                while (--len >= 0)
150                    putc(' ', stdout);
151                putc('\r', stdout);
152                len=0;
153                lines = 0;
154                page_height = terminal_height;
155                please_display_more_prompt &= ~1;
156
157                if (input == 'q')
158                    goto end;
159            }
160
161            /*
162             * There are two input streams to worry about here:
163             *
164             * c     : the character we are reading from the file being "mored"
165             * input : a character received from the keyboard
166             *
167             * If we hit a newline in the _file_ stream, we want to test and
168             * see if any characters have been hit in the _input_ stream. This
169             * allows the user to quit while in the middle of a file.
170             */
171            if (c == '\n') {
172                /* increment by just one line if we are at
173                 * the end of this line */
174                if (input == '\n')
175                    please_display_more_prompt |= 1;
176                /* Adjust the terminal height for any overlap, so that
177                 * no lines get lost off the top. */
178                if (len >= terminal_width) {
179                    int quot, rem;
180                    quot = len / terminal_width;
181                    rem  = len - (quot * terminal_width);
182                    if (quot) {
183                        if (rem)
184                            page_height-=quot;
185                        else
186                            page_height-=(quot-1);
187                    }
188                }
189                if (++lines >= page_height) {
190                    please_display_more_prompt |= 1;
191                }
192                len=0;
193            }
194            /*
195             * If we just read a newline from the file being 'mored' and any
196             * key other than a return is hit, scroll by one page
197             */
198            putc(c, stdout);
199            len++;
200        }
201        fclose(file);
202        fflush(stdout);
203loop:
204        argv++;
205    } while (--argc > 0);
206  end:
207    return 0;
208}
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