blob: 2de19c2e30bed8248fe98d618f53f021a0a4c0e2 [file] [log] [blame]
Paul Fox6ab03782006-06-08 21:37:26 +00001/* vi: set sw=4 ts=4: */
Erik Andersen13456d12000-03-16 08:09:57 +00002/*
Paul Fox6ab03782006-06-08 21:37:26 +00003 * echo implementation for busybox
Erik Andersen13456d12000-03-16 08:09:57 +00004 *
Paul Fox6ab03782006-06-08 21:37:26 +00005 * Copyright (c) 1991, 1993
6 * The Regents of the University of California. All rights reserved.
Erik Andersen13456d12000-03-16 08:09:57 +00007 *
Paul Fox6ab03782006-06-08 21:37:26 +00008 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
Erik Andersen13456d12000-03-16 08:09:57 +00009 *
Paul Fox6ab03782006-06-08 21:37:26 +000010 * Original copyright notice is retained at the end of this file.
Manuel Novoa III cad53642003-03-19 09:13:01 +000011 */
12
Paul Fox6ab03782006-06-08 21:37:26 +000013/* BB_AUDIT SUSv3 compliant -- unless configured as fancy echo. */
14/* http://www.opengroup.org/onlinepubs/007904975/utilities/echo.html */
15
16/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
17 *
18 * Because of behavioral differences, implemented configurable SUSv3
19 * or 'fancy' gnu-ish behaviors. Also, reduced size and fixed bugs.
20 * 1) In handling '\c' escape, the previous version only suppressed the
21 * trailing newline. SUSv3 specifies _no_ output after '\c'.
22 * 2) SUSv3 specifies that octal escapes are of the form \0{#{#{#}}}.
Denis Vlasenko7e754f12007-04-09 13:04:50 +000023 * The previous version did not allow 4-digit octals.
Paul Fox6ab03782006-06-08 21:37:26 +000024 */
25
Eric Andersencbe31da2001-02-20 06:14:08 +000026#include "busybox.h"
Erik Andersen13456d12000-03-16 08:09:57 +000027
Denis Vlasenkobf66fbc2006-12-21 13:23:14 +000028int bb_echo(char **argv)
Paul Fox6ab03782006-06-08 21:37:26 +000029{
Denis Vlasenko7e754f12007-04-09 13:04:50 +000030 const char *arg;
31#if !ENABLE_FEATURE_FANCY_ECHO
Denis Vlasenkoa9d7d242007-04-10 16:34:00 +000032 enum {
33 eflag = '\\',
34 nflag = 1, /* 1 -- print '\n' */
35 };
Paul Fox6ab03782006-06-08 21:37:26 +000036 ++argv;
37#else
38 const char *p;
Denis Vlasenko7e754f12007-04-09 13:04:50 +000039 char nflag = 1;
40 char eflag = 0;
Paul Fox6ab03782006-06-08 21:37:26 +000041
Denis Vlasenko7e754f12007-04-09 13:04:50 +000042 while (1) {
43 arg = *++argv;
44 if (!arg)
Denis Vlasenkoa9d7d242007-04-10 16:34:00 +000045 goto newline_ret;
Denis Vlasenko7e754f12007-04-09 13:04:50 +000046 if (*arg != '-')
47 break;
48
Paul Fox6ab03782006-06-08 21:37:26 +000049 /* If it appears that we are handling options, then make sure
50 * that all of the options specified are actually valid.
51 * Otherwise, the string should just be echoed.
52 */
Denis Vlasenko7e754f12007-04-09 13:04:50 +000053 p = arg + 1;
54 if (!*p) /* A single '-', so echo it. */
Paul Fox6ab03782006-06-08 21:37:26 +000055 goto just_echo;
Paul Fox6ab03782006-06-08 21:37:26 +000056
57 do {
Denis Vlasenko7e754f12007-04-09 13:04:50 +000058 if (!strrchr("neE", *p))
Paul Fox6ab03782006-06-08 21:37:26 +000059 goto just_echo;
Paul Fox6ab03782006-06-08 21:37:26 +000060 } while (*++p);
61
62 /* All of the options in this arg are valid, so handle them. */
Denis Vlasenko7e754f12007-04-09 13:04:50 +000063 p = arg + 1;
Paul Fox6ab03782006-06-08 21:37:26 +000064 do {
Denis Vlasenko7e754f12007-04-09 13:04:50 +000065 if (*p == 'n')
Paul Fox6ab03782006-06-08 21:37:26 +000066 nflag = 0;
Denis Vlasenko7e754f12007-04-09 13:04:50 +000067 if (*p == 'e')
Paul Fox6ab03782006-06-08 21:37:26 +000068 eflag = '\\';
Paul Fox6ab03782006-06-08 21:37:26 +000069 } while (*++p);
70 }
Denis Vlasenko7e754f12007-04-09 13:04:50 +000071 just_echo:
Paul Fox6ab03782006-06-08 21:37:26 +000072#endif
Denis Vlasenko7e754f12007-04-09 13:04:50 +000073 while (1) {
Denis Vlasenkoa9d7d242007-04-10 16:34:00 +000074 /* arg is already == *argv and isn't NULL */
"Robert P. J. Day"68229832006-07-01 13:08:46 +000075 int c;
Paul Fox6ab03782006-06-08 21:37:26 +000076
Denis Vlasenkoa9d7d242007-04-10 16:34:00 +000077 if (!eflag) {
78 /* optimization for very common case */
79 fputs(arg, stdout);
80 } else while ((c = *arg++)) {
Paul Fox6ab03782006-06-08 21:37:26 +000081 if (c == eflag) { /* Check for escape seq. */
Denis Vlasenko7e754f12007-04-09 13:04:50 +000082 if (*arg == 'c') {
Paul Fox6ab03782006-06-08 21:37:26 +000083 /* '\c' means cancel newline and
84 * ignore all subsequent chars. */
Denis Vlasenko7e754f12007-04-09 13:04:50 +000085 goto ret;
Paul Fox6ab03782006-06-08 21:37:26 +000086 }
Denis Vlasenko7e754f12007-04-09 13:04:50 +000087#if !ENABLE_FEATURE_FANCY_ECHO
Paul Fox6ab03782006-06-08 21:37:26 +000088 /* SUSv3 specifies that octal escapes must begin with '0'. */
Denis Vlasenko7e754f12007-04-09 13:04:50 +000089 if ( (((unsigned char)*arg) - '1') >= 7)
Paul Fox6ab03782006-06-08 21:37:26 +000090#endif
91 {
92 /* Since SUSv3 mandates a first digit of 0, 4-digit octals
93 * of the form \0### are accepted. */
Denis Vlasenko7e754f12007-04-09 13:04:50 +000094 if (*arg == '0' && ((unsigned char)(arg[1]) - '0') < 8) {
95 arg++;
Paul Fox6ab03782006-06-08 21:37:26 +000096 }
97 /* bb_process_escape_sequence can handle nul correctly */
Denis Vlasenko7e754f12007-04-09 13:04:50 +000098 c = bb_process_escape_sequence(&arg);
Paul Fox6ab03782006-06-08 21:37:26 +000099 }
100 }
101 putchar(c);
102 }
103
Denis Vlasenko7e754f12007-04-09 13:04:50 +0000104 arg = *++argv;
105 if (!arg)
106 break;
107 putchar(' ');
Paul Fox6ab03782006-06-08 21:37:26 +0000108 }
109
Denis Vlasenko335b63d2007-04-10 21:38:30 +0000110#if ENABLE_FEATURE_FANCY_ECHO
Denis Vlasenkoa9d7d242007-04-10 16:34:00 +0000111 newline_ret:
Denis Vlasenko335b63d2007-04-10 21:38:30 +0000112#endif
Paul Fox6ab03782006-06-08 21:37:26 +0000113 if (nflag) {
114 putchar('\n');
115 }
Denis Vlasenko7e754f12007-04-09 13:04:50 +0000116 ret:
117 return fflush(stdout);
Paul Fox6ab03782006-06-08 21:37:26 +0000118}
119
Denis Vlasenko7e754f12007-04-09 13:04:50 +0000120/* This is a NOFORK applet. Be very careful! */
121
Denis Vlasenko06af2162007-02-03 17:28:39 +0000122int echo_main(int argc, char** argv);
Rob Landleydfba7412006-03-06 20:47:33 +0000123int echo_main(int argc, char** argv)
Erik Andersen13456d12000-03-16 08:09:57 +0000124{
Denis Vlasenko7e754f12007-04-09 13:04:50 +0000125 return bb_echo(argv);
Erik Andersen13456d12000-03-16 08:09:57 +0000126}
Paul Fox6ab03782006-06-08 21:37:26 +0000127
128/*-
129 * Copyright (c) 1991, 1993
130 * The Regents of the University of California. All rights reserved.
131 *
132 * This code is derived from software contributed to Berkeley by
133 * Kenneth Almquist.
134 *
135 * Redistribution and use in source and binary forms, with or without
136 * modification, are permitted provided that the following conditions
137 * are met:
138 * 1. Redistributions of source code must retain the above copyright
139 * notice, this list of conditions and the following disclaimer.
140 * 2. Redistributions in binary form must reproduce the above copyright
141 * notice, this list of conditions and the following disclaimer in the
142 * documentation and/or other materials provided with the distribution.
143 *
144 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
145 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
146 *
147 * California, Berkeley and its contributors.
148 * 4. Neither the name of the University nor the names of its contributors
149 * may be used to endorse or promote products derived from this software
150 * without specific prior written permission.
151 *
152 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
153 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
154 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
155 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
156 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
157 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
158 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
159 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
160 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
161 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
162 * SUCH DAMAGE.
163 *
164 * @(#)echo.c 8.1 (Berkeley) 5/31/93
165 */