more: hardcode FEATURE_USE_TERMIOS=y in this applet; code shrink
function old new delta get_wh - 27 +27 tcsetattr_tty_TCSANOW - 18 +18 gotsig 35 27 -8 more_main 835 759 -76 ------------------------------------------------------------------------------ (add/remove: 2/0 grow/shrink: 0/2 up/down: 45/-84) Total: -39 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
80f806cac9
commit
c5891fe1af
@ -38,32 +38,34 @@
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#include "libbb.h"
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#include "common_bufsiz.h"
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/* Support for FEATURE_USE_TERMIOS */
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struct globals {
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int cin_fileno;
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int tty_fileno;
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unsigned terminal_width;
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unsigned terminal_height;
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struct termios initial_settings;
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struct termios new_settings;
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} FIX_ALIASING;
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#define G (*(struct globals*)bb_common_bufsiz1)
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#define initial_settings (G.initial_settings)
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#define new_settings (G.new_settings )
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#define cin_fileno (G.cin_fileno )
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#define INIT_G() do { setup_common_bufsiz(); } while (0)
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#define setTermSettings(fd, argp) \
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do { \
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if (ENABLE_FEATURE_USE_TERMIOS) \
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tcsetattr(fd, TCSANOW, argp); \
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} while (0)
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#define getTermSettings(fd, argp) tcgetattr(fd, argp)
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static void get_wh(void)
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{
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/* never returns w, h <= 1 */
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get_terminal_width_height(G.tty_fileno, &G.terminal_width, &G.terminal_height);
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G.terminal_height -= 1;
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}
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static void tcsetattr_tty_TCSANOW(struct termios *settings)
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{
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tcsetattr(G.tty_fileno, TCSANOW, settings);
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}
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static void gotsig(int sig UNUSED_PARAM)
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{
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/* bb_putchar_stderr doesn't use stdio buffering,
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* therefore it is safe in signal handler */
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bb_putchar_stderr('\n');
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setTermSettings(cin_fileno, &initial_settings);
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tcsetattr_tty_TCSANOW(&G.initial_settings);
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_exit(EXIT_FAILURE);
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}
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@ -73,22 +75,16 @@ int more_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int more_main(int argc UNUSED_PARAM, char **argv)
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{
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int c = c; /* for compiler */
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int lines;
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int input = 0;
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int spaces = 0;
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int please_display_more_prompt;
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struct stat st;
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FILE *file;
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FILE *cin;
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int len;
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unsigned terminal_width;
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unsigned terminal_height;
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FILE *tty;
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INIT_G();
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/* Parse options */
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/* Accepted but ignored: */
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/* -d Display help instead of ringing bell is pressed */
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/* -d Display help instead of ringing bell */
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/* -f Count logical lines (IOW: long lines are not folded) */
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/* -l Do not pause after any line containing a ^L (form feed) */
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/* -s Squeeze blank lines into one */
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@ -100,26 +96,25 @@ int more_main(int argc UNUSED_PARAM, char **argv)
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* is not a tty and turns into cat. This makes sense. */
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if (!isatty(STDOUT_FILENO))
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return bb_cat(argv);
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cin = fopen_for_read(CURRENT_TTY);
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if (!cin)
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tty = fopen_for_read(CURRENT_TTY);
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if (!tty)
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return bb_cat(argv);
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if (ENABLE_FEATURE_USE_TERMIOS) {
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cin_fileno = fileno(cin);
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getTermSettings(cin_fileno, &initial_settings);
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new_settings = initial_settings;
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new_settings.c_lflag &= ~(ICANON | ECHO);
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new_settings.c_cc[VMIN] = 1;
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new_settings.c_cc[VTIME] = 0;
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setTermSettings(cin_fileno, &new_settings);
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bb_signals(0
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+ (1 << SIGINT)
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+ (1 << SIGQUIT)
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+ (1 << SIGTERM)
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, gotsig);
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}
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G.tty_fileno = fileno(tty);
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tcgetattr(G.tty_fileno, &G.initial_settings);
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G.new_settings = G.initial_settings;
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G.new_settings.c_lflag &= ~(ICANON | ECHO);
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G.new_settings.c_cc[VMIN] = 1;
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G.new_settings.c_cc[VTIME] = 0;
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tcsetattr_tty_TCSANOW(&G.new_settings);
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bb_signals(BB_FATAL_SIGS, gotsig);
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do {
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struct stat st;
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FILE *file;
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int len;
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int lines;
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file = stdin;
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if (*argv) {
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file = fopen_or_warn(*argv, "r");
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@ -129,17 +124,20 @@ int more_main(int argc UNUSED_PARAM, char **argv)
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st.st_size = 0;
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fstat(fileno(file), &st);
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please_display_more_prompt = 0;
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/* never returns w, h <= 1 */
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get_terminal_width_height(fileno(cin), &terminal_width, &terminal_height);
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terminal_height -= 1;
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get_wh();
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please_display_more_prompt = 0;
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len = 0;
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lines = 0;
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while (spaces || (c = getc(file)) != EOF) {
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for (;;) {
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int wrap;
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if (spaces)
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spaces--;
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else {
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c = getc(file);
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if (c == EOF) break;
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}
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loop_top:
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if (input != 'r' && please_display_more_prompt) {
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len = printf("--More-- ");
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@ -151,26 +149,26 @@ int more_main(int argc UNUSED_PARAM, char **argv)
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(int) ((uoff_t)ftello(file) / d),
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st.st_size);
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}
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fflush_all();
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/*
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* We've just displayed the "--More--" prompt, so now we need
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* to get input from the user.
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*/
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for (;;) {
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input = getc(cin);
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fflush_all();
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input = getc(tty);
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input = tolower(input);
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if (!ENABLE_FEATURE_USE_TERMIOS)
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printf("\033[A"); /* cursor up */
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/* Erase the last message */
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printf("\r%*s\r", len, "");
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if (input == 'q')
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goto end;
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/* Due to various multibyte escape
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* sequences, it's not ok to accept
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* any input as a command to scroll
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* the screen. We only allow known
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* commands, else we show help msg. */
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if (input == ' ' || input == '\n' || input == 'q' || input == 'r')
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if (input == ' ' || input == '\n' || input == 'r')
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break;
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len = printf("(Enter:next line Space:next page Q:quit R:show the rest)");
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}
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@ -178,15 +176,9 @@ int more_main(int argc UNUSED_PARAM, char **argv)
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lines = 0;
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please_display_more_prompt = 0;
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if (input == 'q')
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goto end;
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/* The user may have resized the terminal.
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* Re-read the dimensions. */
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if (ENABLE_FEATURE_USE_TERMIOS) {
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get_terminal_width_height(cin_fileno, &terminal_width, &terminal_height);
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terminal_height -= 1;
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}
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get_wh();
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}
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/* Crudely convert tabs into spaces, which are
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@ -206,11 +198,11 @@ int more_main(int argc UNUSED_PARAM, char **argv)
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* see if any characters have been hit in the _input_ stream. This
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* allows the user to quit while in the middle of a file.
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*/
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wrap = (++len > terminal_width);
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wrap = (++len > G.terminal_width);
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if (c == '\n' || wrap) {
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/* Then outputting this character
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* will move us to a new line. */
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if (++lines >= terminal_height || input == '\n')
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if (++lines >= G.terminal_height || input == '\n')
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please_display_more_prompt = 1;
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len = 0;
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}
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@ -230,6 +222,6 @@ int more_main(int argc UNUSED_PARAM, char **argv)
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fflush_all();
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} while (*argv && *++argv);
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end:
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setTermSettings(cin_fileno, &initial_settings);
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tcsetattr_tty_TCSANOW(&G.initial_settings);
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return 0;
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}
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