int more_main(int argc UNUSED_PARAM, char **argv) { int c = c; /* for compiler */ int lines; int input = 0; int spaces = 0; int please_display_more_prompt; struct stat st; FILE *file; FILE *cin; int len; unsigned terminal_width; unsigned terminal_height; INIT_G(); argv++; /* Another popular pager, most, detects when stdout * is not a tty and turns into cat. This makes sense. */ if (!isatty(STDOUT_FILENO)) return bb_cat(argv); cin = fopen_for_read(CURRENT_TTY); if (!cin) return bb_cat(argv); if (ENABLE_FEATURE_USE_TERMIOS) { cin_fileno = fileno(cin); getTermSettings(cin_fileno, &initial_settings); new_settings = initial_settings; new_settings.c_lflag &= ~(ICANON | ECHO); new_settings.c_cc[VMIN] = 1; new_settings.c_cc[VTIME] = 0; setTermSettings(cin_fileno, &new_settings); bb_signals(0 + (1 << SIGINT) + (1 << SIGQUIT) + (1 << SIGTERM) , gotsig); } do { file = stdin; if (*argv) { file = fopen_or_warn(*argv, "r"); if (!file) continue; } st.st_size = 0; fstat(fileno(file), &st); please_display_more_prompt = 0; /* never returns w, h <= 1 */ get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height); terminal_height -= 1; len = 0; lines = 0; while (spaces || (c = getc(file)) != EOF) { int wrap; if (spaces) spaces--; loop_top: if (input != 'r' && please_display_more_prompt) { len = printf("--More-- "); if (st.st_size != 0) { uoff_t d = (uoff_t)st.st_size / 100; if (d == 0) d = 1; len += printf("(%u%% of %"OFF_FMT"u bytes)", (int) ((uoff_t)ftello(file) / d), st.st_size); } fflush_all(); /* * We've just displayed the "--More--" prompt, so now we need * to get input from the user. */ for (;;) { input = getc(cin); input = tolower(input); if (!ENABLE_FEATURE_USE_TERMIOS) printf("\033[A"); /* cursor up */ /* Erase the last message */ printf("\r%*s\r", len, ""); /* Due to various multibyte escape * sequences, it's not ok to accept * any input as a command to scroll * the screen. We only allow known * commands, else we show help msg. */ if (input == ' ' || input == '\n' || input == 'q' || input == 'r') break; len = printf("(Enter:next line Space:next page Q:quit R:show the rest)"); } len = 0; lines = 0; please_display_more_prompt = 0; if (input == 'q') goto end; /* The user may have resized the terminal. * Re-read the dimensions. */ if (ENABLE_FEATURE_USE_TERMIOS) { get_terminal_width_height(cin_fileno, &terminal_width, &terminal_height); terminal_height -= 1; } } /* Crudely convert tabs into spaces, which are * a bajillion times easier to deal with. */ if (c == '\t') { spaces = ((unsigned)~len) % CONVERTED_TAB_SIZE; c = ' '; } /* * 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. */ wrap = (++len > terminal_width); if (c == '\n' || wrap) { /* Then outputting this character * will move us to a new line. */ if (++lines >= terminal_height || input == '\n') please_display_more_prompt = 1; len = 0; } if (c != '\n' && wrap) { /* Then outputting this will also put a character on * the beginning of that new line. Thus we first want to * display the prompt (if any), so we skip the putchar() * and go back to the top of the loop, without reading * a new character. */ putchar('\n'); goto loop_top; } /* My small mind cannot fathom backspaces and UTF-8 */ putchar(c); die_if_ferror_stdout(); /* if tty was destroyed (closed xterm, etc) */ } fclose(file); fflush_all(); } while (*argv && *++argv); end: setTermSettings(cin_fileno, &initial_settings); return 0; }
int head_main(int argc, char **argv) { unsigned long count = 10; unsigned long i; #if ENABLE_FEATURE_FANCY_HEAD int count_bytes = 0; int header_threshhold = 1; #endif FILE *fp; const char *fmt; char *p; int opt; int c; int retval = EXIT_SUCCESS; #if ENABLE_INCLUDE_SUSv2 || ENABLE_FEATURE_FANCY_HEAD /* Allow legacy syntax of an initial numeric option without -n. */ if (argc > 1 && argv[1][0] == '-' && isdigit(argv[1][1]) ) { --argc; ++argv; p = (*argv) + 1; goto GET_COUNT; } #endif /* No size benefit in converting this to getopt32 */ while ((opt = getopt(argc, argv, head_opts)) > 0) { switch (opt) { #if ENABLE_FEATURE_FANCY_HEAD case 'q': header_threshhold = INT_MAX; break; case 'v': header_threshhold = -1; break; case 'c': count_bytes = 1; /* fall through */ #endif case 'n': p = optarg; #if ENABLE_INCLUDE_SUSv2 || ENABLE_FEATURE_FANCY_HEAD GET_COUNT: #endif #if !ENABLE_FEATURE_FANCY_HEAD count = xatoul(p); #else count = xatoul_sfx(p, head_suffixes); #endif break; default: bb_show_usage(); } } argv += optind; if (!*argv) { *--argv = "-"; } fmt = header_fmt_str + 1; #if ENABLE_FEATURE_FANCY_HEAD if (argc - optind <= header_threshhold) { header_threshhold = 0; } #else if (argc <= optind + 1) { fmt += 11; } /* Now define some things here to avoid #ifdefs in the code below. * These should optimize out of the if conditions below. */ #define header_threshhold 1 #define count_bytes 0 #endif do { fp = fopen_or_warn_stdin(*argv); if (fp) { if (fp == stdin) { *argv = (char *) bb_msg_standard_input; } if (header_threshhold) { printf(fmt, *argv); } i = count; while (i && ((c = getc(fp)) != EOF)) { if (count_bytes || (c == '\n')) { --i; } putchar(c); } if (fclose_if_not_stdin(fp)) { bb_perror_msg("%s", *argv); /* Avoid multibyte problems. */ retval = EXIT_FAILURE; } die_if_ferror_stdout(); } fmt = header_fmt_str; } while (*++argv); fflush_stdout_and_exit(retval); }