mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-03 17:31:50 +00:00
76 lines
1.5 KiB
C
76 lines
1.5 KiB
C
/* 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 tarball for details.
|
|
*/
|
|
|
|
/* See "Cat -v considered harmful" at
|
|
* http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz */
|
|
|
|
#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);
|
|
}
|