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