/* more.c - View FILE (or stdin) one screenfull at a time. * * Copyright 2013 Bilal Qureshi <bilal.jmi@gmail.com> * * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/more.html USE_MORE(NEWTOY(more, 0, TOYFLAG_USR|TOYFLAG_BIN)) config MORE bool "more" default n help usage: more [FILE...] View FILE(s) (or stdin) one screenfull at a time. */ #define FOR_more #include "toys.h" GLOBALS( struct termios inf; int cin_fd; ) static void signal_handler(int sig) { // Reset the terminal whether we were signalled or exited normally. tcsetattr(TT.cin_fd, TCSANOW, &TT.inf); // If we were actually signalled, move to a new line and re-raise the signal. if (sig != 0) { xputc('\n'); signal(sig, SIG_DFL); raise(sig); _exit(sig | 128); } } static void show_file_header(const char *name) { printf("::::::::::::::\n%s\n::::::::::::::\n", name); } static int prompt(FILE *cin, const char* fmt, ...) { int input_key; va_list ap; printf("\33[7m"); // Reverse video before printing the prompt. va_start(ap, fmt); vfprintf(stdout, fmt, ap); va_end(ap); while (1) { fflush(NULL); input_key = tolower(getc(cin)); printf("\33[0m\33[1K\r"); // Reset all attributes, erase to start of line. if (strchr(" \nrq", input_key)) { fflush(NULL); return input_key; } printf("\33[7m(Enter:Next line Space:Next page Q:Quit R:Show the rest)"); } } static int more_directory(char *path, struct stat *st) { if (!stat(path, st) && S_ISDIR(st->st_mode)) { printf("\n*** %s: directory ***\n\n", path); return 1; } return 0; } static void do_cat_operation(int fd, char *name) { struct stat st; if (!more_directory(name, &st)) { show_file_header(name); fflush(stdout); xsendfile(fd, 1); } } void more_main() { int ch, input_key = 0, show_prompt; unsigned rows = 24, cols = 80, row = 0, col = 0; struct stat st; struct termios newf; FILE *fp, *cin; if (!isatty(1) || !(cin = fopen("/dev/tty", "r"))) { loopfiles(toys.optargs, do_cat_operation); return; } TT.cin_fd = fileno(cin); tcgetattr(TT.cin_fd, &TT.inf); //Prepare terminal for input memcpy(&newf, &TT.inf, sizeof(struct termios)); newf.c_lflag &= ~(ICANON | ECHO); newf.c_cc[VMIN] = 1; newf.c_cc[VTIME] = 0; tcsetattr(TT.cin_fd, TCSANOW, &newf); sigatexit(signal_handler); do { char *filename = *toys.optargs; st.st_size = show_prompt = col = row = 0; if (!filename) fp = stdin; else { if (more_directory(filename, &st)) goto next_file; if (!(fp = fopen(filename, "r"))) { perror_msg("%s", filename); goto next_file; } } terminal_size(&cols, &rows); rows--; if (toys.optc > 1) { show_file_header(filename); row += 3; } while ((ch = getc(fp)) != EOF) { if (input_key != 'r' && show_prompt) { if (st.st_size) input_key = prompt(cin, "--More--(%d%% of %lld bytes)", (int) (100 * ( (double) ftell(fp) / (double) st.st_size)), (long long)st.st_size); else input_key = prompt(cin, "--More--"); if (input_key == 'q') goto stop; col = row = show_prompt = 0; terminal_size(&cols, &rows); rows--; } putchar(ch); if (ch == '\t') col = (col | 0x7) + 1; else col++; if (col == cols) putchar(ch = '\n'); if (ch == '\n') { col = 0; if (++row >= rows || input_key == '\n') show_prompt = 1; } } fclose(fp); next_file: if (*toys.optargs && *++toys.optargs) { input_key = prompt(cin, "--More--(Next file: %s)", *toys.optargs); if (input_key == 'q') goto stop; } } while (*toys.optargs); stop: tcsetattr(TT.cin_fd, TCSANOW, &TT.inf); fclose(cin); // Even if optarg not found, exit value still 0 toys.exitval = 0; }