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Refactor catv. Move visible() from stty to libbb.

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Fixes the following TODO:

  stty's visible() function and catv's guts are identical. Merge them into
  an appropriate libbb function.

Also makes catv behave exactly like coreutils' cat -v e.g. it'll print 'M-^I'
instead of 'M-   '.

function                                             old     new   delta
visible                                                -      70     +70
do_display                                           431     379     -52
catv_main                                            306     250     -56
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/2 up/down: 70/-108)           Total: -38 bytes

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Bartosz Golaszewski
2013-07-30 06:29:42 +02:00
committed by Denys Vlasenko
parent d0bc708cb5
commit 79c618c411
5 changed files with 51 additions and 58 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
coreutils/catv.c
View File

@ -25,14 +25,20 @@ int catv_main(int argc UNUSED_PARAM, char **argv)
{
int retval = EXIT_SUCCESS;
int fd;
unsigned flags;
unsigned opts;
int flags = 0;
flags = getopt32(argv, "etv");
opts = 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;
if (opts & (CATV_OPT_e | CATV_OPT_t))
opts &= ~CATV_OPT_v;
if (opts & CATV_OPT_e)
flags |= VISIBLE_ENDLINE;
if (opts & CATV_OPT_t)
flags |= VISIBLE_SHOW_TABS;
/* Read from stdin if there's nothing else to do. */
if (!argv[0])
@ -50,29 +56,17 @@ int catv_main(int argc UNUSED_PARAM, char **argv)
res = read(fd, read_buf, COMMON_BUFSIZE);
if (res < 0)
retval = EXIT_FAILURE;
if (res < 1)
if (res <= 0)
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 (opts & CATV_OPT_v) {
putchar(c);
} else {
char buf[sizeof("M-^c")];
visible(c, buf, flags);
fputs(buf, stdout);
}
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)