76 lines
1.5 KiB
C
76 lines
1.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* cat -v implementation for busybox
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*
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* Copyright (C) 2006 Rob Landley <rob@landley.net>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* See "Cat -v considered harmful" at
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* http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */
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#include "libbb.h"
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int catv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int catv_main(int argc UNUSED_PARAM, char **argv)
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{
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int retval = EXIT_SUCCESS;
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int fd;
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unsigned flags;
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flags = getopt32(argv, "etv");
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#define CATV_OPT_e (1<<0)
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#define CATV_OPT_t (1<<1)
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#define CATV_OPT_v (1<<2)
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flags ^= CATV_OPT_v;
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argv += optind;
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/* Read from stdin if there's nothing else to do. */
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if (!argv[0])
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*--argv = (char*)"-";
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do {
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fd = open_or_warn_stdin(*argv);
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if (fd < 0) {
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retval = EXIT_FAILURE;
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continue;
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}
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for (;;) {
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int i, res;
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#define read_buf bb_common_bufsiz1
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res = read(fd, read_buf, COMMON_BUFSIZE);
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if (res < 0)
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retval = EXIT_FAILURE;
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if (res < 1)
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break;
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for (i = 0; i < res; i++) {
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unsigned char c = read_buf[i];
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if (c > 126 && (flags & CATV_OPT_v)) {
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if (c == 127) {
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printf("^?");
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continue;
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}
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printf("M-");
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c -= 128;
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}
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if (c < 32) {
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if (c == 10) {
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if (flags & CATV_OPT_e)
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bb_putchar('$');
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} else if (flags & (c==9 ? CATV_OPT_t : CATV_OPT_v)) {
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printf("^%c", c+'@');
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continue;
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}
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}
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bb_putchar(c);
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}
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}
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if (ENABLE_FEATURE_CLEAN_UP && fd)
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close(fd);
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} while (*++argv);
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fflush_stdout_and_exit(retval);
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}
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