/* vi: set sw=4 ts=4: */ /* * Mini more implementation for busybox * * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> * * Latest version blended together by Erik Andersen <andersen@codepoet.org>, * based on the original more implementation by Bruce, and code from the * Debian boot-floppies team. * * Termios corrects by Vladimir Oleynik <dzo@simtreas.ru> * * Licensed under GPLv2 or later, see file License in this tarball for details. */ #include "busybox.h" #ifdef CONFIG_FEATURE_USE_TERMIOS static int cin_fileno; #include <termios.h> #define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp) #define getTermSettings(fd,argp) tcgetattr(fd, argp); static struct termios initial_settings, new_settings; static void set_tty_to_initial_mode(void) { setTermSettings(cin_fileno, &initial_settings); } static void gotsig(int sig) { putchar('\n'); exit(EXIT_FAILURE); } #endif /* CONFIG_FEATURE_USE_TERMIOS */ int more_main(int argc, char **argv) { int c, lines, input = 0; int please_display_more_prompt = 0; struct stat st; FILE *file; FILE *cin; int len, page_height; int terminal_width; int terminal_height; argc--; argv++; /* not use inputing from terminal if usage: more > outfile */ if(isatty(STDOUT_FILENO)) { cin = fopen(CURRENT_TTY, "r"); if (!cin) cin = xfopen(CONSOLE_DEV, "r"); please_display_more_prompt = 2; #ifdef CONFIG_FEATURE_USE_TERMIOS cin_fileno = fileno(cin); getTermSettings(cin_fileno, &initial_settings); new_settings = initial_settings; new_settings.c_lflag &= ~ICANON; new_settings.c_lflag &= ~ECHO; new_settings.c_cc[VMIN] = 1; new_settings.c_cc[VTIME] = 0; setTermSettings(cin_fileno, &new_settings); atexit(set_tty_to_initial_mode); (void) signal(SIGINT, gotsig); (void) signal(SIGQUIT, gotsig); (void) signal(SIGTERM, gotsig); #endif } else { cin = stdin; } do { if (argc == 0) { file = stdin; } else file = bb_wfopen(*argv, "r"); if(file==0) goto loop; st.st_size = 0; fstat(fileno(file), &st); please_display_more_prompt &= ~1; get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height); if (terminal_height > 4) terminal_height -= 2; if (terminal_width > 0) terminal_width -= 1; len=0; lines = 0; page_height = terminal_height; while ((c = getc(file)) != EOF) { if ((please_display_more_prompt & 3) == 3) { len = printf("--More-- "); if (file != stdin && st.st_size > 0) { #if _FILE_OFFSET_BITS == 64 len += printf("(%d%% of %lld bytes)", (int) (100 * ((double) ftell(file) / (double) st.st_size)), (long long)st.st_size); #else len += printf("(%d%% of %ld bytes)", (int) (100 * ((double) ftell(file) / (double) st.st_size)), (long)st.st_size); #endif } fflush(stdout); /* * We've just displayed the "--More--" prompt, so now we need * to get input from the user. */ input = getc(cin); #ifndef CONFIG_FEATURE_USE_TERMIOS printf("\033[A"); /* up cursor */ #endif /* Erase the "More" message */ putc('\r', stdout); while (--len >= 0) putc(' ', stdout); putc('\r', stdout); len=0; lines = 0; page_height = terminal_height; please_display_more_prompt &= ~1; if (input == 'q') goto end; } /* * There are two input streams to worry about here: * * c : the character we are reading from the file being "mored" * input : a character received from the keyboard * * If we hit a newline in the _file_ stream, we want to test and * see if any characters have been hit in the _input_ stream. This * allows the user to quit while in the middle of a file. */ if (c == '\n') { /* increment by just one line if we are at * the end of this line */ if (input == '\n') please_display_more_prompt |= 1; /* Adjust the terminal height for any overlap, so that * no lines get lost off the top. */ if (len >= terminal_width) { int quot, rem; quot = len / terminal_width; rem = len - (quot * terminal_width); if (quot) { if (rem) page_height-=quot; else page_height-=(quot-1); } } if (++lines >= page_height) { please_display_more_prompt |= 1; } len=0; } /* * If we just read a newline from the file being 'mored' and any * key other than a return is hit, scroll by one page */ putc(c, stdout); len++; } fclose(file); fflush(stdout); loop: argv++; } while (--argc > 0); end: return 0; }