/* vi: set sw=4 ts=4: */ /* * cat -v implementation for busybox * * Copyright (C) 2006 Rob Landley <rob@landley.net> * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ /* See "Cat -v considered harmful" at * http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */ //usage:#define catv_trivial_usage //usage: "[-etv] [FILE]..." //usage:#define catv_full_usage "\n\n" //usage: "Display nonprinting characters as ^x or M-x\n" //usage: "\n -e End each line with $" //usage: "\n -t Show tabs as ^I" //usage: "\n -v Don't use ^x or M-x escapes" #include "libbb.h" int catv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int catv_main(int argc UNUSED_PARAM, char **argv) { int retval = EXIT_SUCCESS; int fd; unsigned flags; flags = getopt32(argv, "etv"); #define CATV_OPT_e (1<<0) #define CATV_OPT_t (1<<1) #define CATV_OPT_v (1<<2) flags ^= CATV_OPT_v; argv += optind; /* Read from stdin if there's nothing else to do. */ if (!argv[0]) *--argv = (char*)"-"; do { fd = open_or_warn_stdin(*argv); if (fd < 0) { retval = EXIT_FAILURE; continue; } for (;;) { int i, res; #define read_buf bb_common_bufsiz1 res = read(fd, read_buf, COMMON_BUFSIZE); if (res < 0) retval = EXIT_FAILURE; if (res < 1) break; for (i = 0; i < res; i++) { unsigned char c = read_buf[i]; if (c > 126 && (flags & CATV_OPT_v)) { if (c == 127) { printf("^?"); continue; } printf("M-"); c -= 128; } if (c < 32) { if (c == 10) { if (flags & CATV_OPT_e) bb_putchar('$'); } else if (flags & (c==9 ? CATV_OPT_t : CATV_OPT_v)) { printf("^%c", c+'@'); continue; } } bb_putchar(c); } } if (ENABLE_FEATURE_CLEAN_UP && fd) close(fd); } while (*++argv); fflush_stdout_and_exit(retval); }