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/* echo.c - echo supporting -n and -e.
*
* Copyright 2007 Rob Landley <rob@landley.net>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/echo.html
*
* Deviations from posix: we parse command line options, as Linux has
* consistently done since 1992. Posix defaults -e to on, we require -e.
* We also honor -- to _stop_ option parsing (bash doesn't, we go with
* consistency over compatibility here).
USE_ECHO(NEWTOY(echo, "^?Een[-eE]", TOYFLAG_BIN|TOYFLAG_MAYFORK|TOYFLAG_LINEBUF))
config ECHO
bool "echo"
default y
help
usage: echo [-neE] [ARG...]
Write each argument to stdout, one space between each, followed by a newline.
-n No trailing newline
-E Print escape sequences literally (default)
-e Process the following escape sequences:
\\ Backslash \0NNN Octal (1-3 digit) \xHH Hex (1-2 digit)
\a Alert (beep/flash) \b Backspace \c Stop here (no \n)
\f Form feed \n Newline \r Carriage return
\t Horizontal tab \v Vertical tab
*/
#define FOR_echo
#include "toys.h"
void echo_main(void)
{
int i = 0;
char *arg, *c, out[8];
while ((arg = toys.optargs[i])) {
if (i++) putchar(' ');
// Should we output arg verbatim?
if (!FLAG(e)) {
xprintf("%s", arg);
continue;
}
// Handle -e
for (c = arg; *c; ) {
unsigned u;
if (*c == '\\' && c[1] == 'c') return;
if ((u = unescape2(&c, 1))<128) putchar(u);
else printf("%.*s", (int)wcrtomb(out, u, 0), out);
}
}
// Output "\n" if no -n
if (!FLAG(n)) putchar('\n');
}
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