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/* vi: set sw=4 ts=4:
*
* cat -v implementation for toybox
*
* Copyright (C) 2006, 2007 Rob Landley <rob@landley.net>
*
* Not in SUSv3, but see "Cat -v considered harmful" at
* http://cm.bell-labs.com/cm/cs/doc/84/kp.ps.gz
config CATV
bool "catv"
default y
help
usage: catv [-evt] [filename...]
Display nonprinting characters as escape sequences. Use M-x for
high ascii characters (>127), and ^x for other nonprinting chars.
-e Mark each newline with $
-t Show tabs as ^I
-v Don't use ^x or M-x escapes.
*/
#include "toys.h"
// Callback function for loopfiles()
static void do_catv(int fd, char *name)
{
for(;;) {
int i, len;
len = read(fd, toybuf, sizeof(toybuf));
if (len < 0) toys.exitval = EXIT_FAILURE;
if (len < 1) break;
for (i=0; i<len; i++) {
char c=toybuf[i];
if (c > 126 && (toys.optflags & 4)) {
if (c == 127) {
printf("^?");
continue;
} else {
printf("M-");
c -= 128;
}
}
if (c < 32) {
if (c == 10) {
if (toys.optflags & 1) xputc('$');
} else if (toys.optflags & (c==9 ? 2 : 4)) {
printf("^%c", c+'@');
continue;
}
}
xputc(c);
}
}
}
void catv_main(void)
{
toys.optflags^=4;
loopfiles(toys.optargs, do_catv);
}
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