| /* 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); |
| } |